• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In an active drive type liquid crystal display device using a TFT or the like using a liquid crystal material having spontaneous polarization, it is possible to improve the light utilization efficiency, to use the liquid crystal material having large spontaneous polarization, and to reduce the driving voltage. In the recording process in one frame, the TFT of each pixel electrode is driven for each line of the liquid crystal panel to apply the voltage according to the image data twice. In the erasing process in one frame, voltage is applied to the liquid crystal three times by simultaneous selection of all the pixel electrodes. By applying the voltage three times, the display state of each pixel is made black and the amount of accumulated charge of each pixel liquid crystal is approximately zero.
    公开号:KR20030069031A
    申请号:KR1020020057619
    申请日:2002-09-23
    公开日:2003-08-25
    发明作者:요시하라도시아키；다다키신지；마키노데츠야；시로토히로노리；기요타요시노리；베쓰이게이이찌
    申请人:후지쯔 가부시끼가이샤；
    IPC主号:
    专利说明:

    DRIVING METHOD OF LIQUID CRYSTAL DISPLAY DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE
    [37] The present invention relates to a method of driving a liquid crystal display element using a liquid crystal material having spontaneous polarization, and a liquid crystal display device using the driving method.
    [38] In recent years, with the advancement of the so-called information society, electronic devices represented by personal computers, personal digital assistants (PDAs), and the like have become widely used. In addition, with the spread of such electronic devices, there is a demand for a portable type that can be used in an office or outdoors, and the miniaturization and light weight of these electronic devices are desired. As one of means for achieving the above object, the liquid crystal display device has been widely used. The liquid crystal display device is an indispensable technology for not only miniaturization and light weight, but also low power consumption of a battery powered portable electronic device.
    [39] By the way, the liquid crystal display is classified into reflection type and transmission type. The reflective liquid crystal display device is configured to reflect light incident from the front side of the liquid crystal panel on the back side of the liquid crystal panel and visually confirm the image by the reflected light. The transmission type is a light source (backlight) provided on the rear side of the liquid crystal panel. It is a structure which visually confirms an image by transmitted light. Since the reflection type is inferior in visibility because the amount of reflected light is not constant according to environmental conditions, in particular, as a display device such as a personal computer which performs multi-color or full-color display, a transmissive liquid crystal display device is generally used. It is used.
    [40] On the other hand, current color liquid crystal display devices are classified into a super twisted nematic (STN) type and a thin film transistor-twisted nematic (TFT-TN) type in terms of liquid crystal materials that are generally used. Although the STN type is relatively inexpensive to manufacture, crosstalk tends to occur and the response speed is relatively slow, so that the STN type is not suitable for moving picture display. On the other hand, the TFT-TN type has better display quality than the STN type, but since the light transmittance of the liquid crystal panel is about 4% in the present situation, a high brightness backlight is required. Therefore, in the TFT-TN type, the power consumption by the backlight becomes large, and there is a problem when carrying the battery power supply. In addition, in the TFT-TN type, there are also problems such as a slow response speed, especially a halftone response speed, a narrow viewing angle, and difficulty in adjusting the color balance.
    [41] Therefore, the inventors of the present application are promoting the development of a liquid crystal display device using ferroelectric liquid crystals having spontaneous polarization and having a high response speed with respect to an applied voltage of several hundreds to several kilowatts. When a ferroelectric liquid crystal having spontaneous polarization is used as the liquid crystal material, the liquid crystal molecules are always parallel to the substrate regardless of the presence or absence of an applied voltage, and the change in refractive index due to the viewing direction is much smaller than that of the conventional STN type and the TN type. Thus, it is possible to obtain a wide viewing angle. In addition, the liquid crystal display device which drives ferroelectric liquid crystals excellent in terms of responsiveness and viewing angle compared to conventional liquid crystal materials by switching elements such as TFTs realizes light transmittance according to the magnitude of the applied voltage to achieve halftone display and moving picture. It is possible to display.
    [42] This ferroelectric liquid crystal has the characteristics of an applied voltage and a light transmittance as shown in FIG. That is, the light transmittance of the ferroelectric liquid crystal varies depending on the polarity of the applied voltage. For example, in the case of positive (+) application, the light transmittance increases according to the applied voltage, and in the case of negative (-) application, Regardless, the light transmittance is approximately zero. Therefore, in the conventional example, display control is performed in the driving sequence as shown in FIG.
    [43] Two selective scans are performed on the pixel electrodes of each line in one frame for forming the display image, and voltages of the same magnitude and opposite polarities are applied to the liquid crystal material alternately for a predetermined period at regular intervals. The magnitude of the applied voltage corresponds to the image data, and a display image is obtained by applying a voltage according to the image data at the beginning of each frame (recording processing), and then displayed by applying a voltage of opposite polarity and the same magnitude to this. The image is erased (erase processing). Image display is realized by repeating such recording processing and erasing processing in each frame. In addition, by the write processing and the erase processing by line scanning, display without luminance unevenness can be realized, and the bias of charge is suppressed to eliminate the burn-in of the display.
    [44] In this driving method, as shown in FIG. 23, since the transmittance is approximately 0% at the negative (-) polarity of the applied voltage, the display is black. Therefore, the time contributing to the actual display is half of the whole, and the light utilization efficiency which is the ratio of the screen brightness and the light source brightness is low (in the conventional example of the driving procedure shown in Fig. 24, the percentage of screen brightness / backlight brightness is 6%). there is a problem.
    [45] In addition, since ferroelectric liquid crystals have spontaneous polarization, it has been thought that at least one charge of spontaneous polarization must be accumulated in each pixel electrode in the selective scanning of each pixel electrode, and the capacitance and driving voltage of each pixel electrode are not very large. In this case, there is a problem that a liquid crystal material having a large spontaneous polarization cannot be used.
    [46] In addition, when mounting on a portable device is considered, driving at a lower voltage is preferable, but sufficient power saving is not realized (drive in the conventional example in the case of using ferroelectric liquid crystal having a spontaneous polarization size of 11 nC / cm 2). The voltage is 12V).
    [47] This invention is devised in view of such a situation, Comprising: It aims at providing the liquid crystal display element drive method and liquid crystal display device which can aim at the improvement of light utilization efficiency.
    [48] Another object of the present invention is to provide a liquid crystal display device driving method and liquid crystal display device which can use a liquid crystal material having a large spontaneous polarization, and can further shorten the response time.
    [49] Another object of the present invention is to provide a method for driving a liquid crystal display element and a liquid crystal display device capable of reducing the driving voltage.
    [1] 1 is a block diagram showing an overall configuration of a liquid crystal display device according to the present invention.
    [2] 2 is a schematic perspective view showing an example of the configuration of a liquid crystal panel and a back-light.
    [3] 3 is a schematic cross-sectional view of a liquid crystal panel.
    [4] 4 is a diagram showing a driving sequence according to Embodiment 1 of the present invention;
    [5] 5 is a diagram showing a driving sequence according to Embodiment 2 of the present invention;
    [6] 6 is a view showing a driving sequence according to Embodiments 1 and 2 of the present invention;
    [7] FIG. 7 is a diagram showing a driving procedure according to Embodiment 3 of the present invention; FIG.
    [8] 8 is a diagram showing a driving sequence according to Embodiment 4 of the present invention;
    [9] 9 is a view showing a driving sequence according to Embodiments 3 and 4 of the present invention;
    [10] 10 is a diagram showing a driving sequence according to Embodiment 5 of the present invention;
    [11] 11 is a view showing a driving sequence according to Embodiment 6 of the present invention;
    [12] 12 is a view showing a driving sequence according to Embodiments 5 and 6 of the present invention;
    [13] Fig. 13 is a diagram showing a driving sequence according to Embodiment 7 of the present invention.
    [14] 14 is a diagram showing a driving sequence according to Embodiment 8 of the present invention;
    [15] 15 is a view showing a driving sequence according to Embodiments 7 and 8 of the present invention;
    [16] Fig. 16 is a schematic diagram showing a configuration example of a light source (LED array) in Embodiment 9 of the present invention.
    [17] FIG. 17 is a diagram showing an example of a driving procedure according to Embodiment 9 of the present invention; FIG.
    [18] 18 is a diagram showing another example of the driving sequence according to the ninth embodiment of the present invention;
    [19] 19 is a diagram showing still another example of the driving sequence according to the ninth embodiment of the present invention;
    [20] 20 is a diagram showing still another example of the driving sequence according to the ninth embodiment of the present invention;
    [21] 21 is a diagram showing still another example of the driving sequence according to the ninth embodiment of the present invention;
    [22] 22 is a diagram showing still another example of the driving sequence according to the ninth embodiment of the present invention;
    [23] Fig. 23 is a graph showing the characteristics of applied voltage and light transmittance in ferroelectric liquid crystals.
    [24] 24 is a diagram showing a conventional driving procedure.
    [25] * Explanation of symbols for main parts of the drawings
    [26] 1: liquid crystal panel
    [27] 2: common electrode
    [28] 5: pixel electrode
    [29] 9: liquid crystal layer
    [30] 21: TFT
    [31] 22: data driver
    [32] 23: signal line
    [33] 24: scan driver
    [34] 25: scanning line
    [35] 26 back-light
    [36] 26a, 26c: light source
    [50] In the method for driving a liquid crystal display device according to the first invention, a liquid crystal material having spontaneous polarization is enclosed between a common electrode and a plurality of pixel electrodes, and a voltage is applied to the liquid crystal material corresponding to each of the plurality of pixel electrodes. In a method for driving a liquid crystal display element for performing a recording process and an erasing process of image data by applying a voltage to the liquid crystal material corresponding to each of the plurality of pixel electrodes to a liquid crystal display element provided with a switching means for controlling. In the erasing process, the voltage is applied to the liquid crystal material by the simultaneous selection of some or all of the plurality of pixel electrodes, characterized in that a plurality of times is performed.
    [51] In the driving method of the liquid crystal display element according to the second invention, in the first invention, voltage is applied to the liquid crystal material in each of a plurality of selection periods for simultaneously selecting part or all of the plurality of pixel electrodes. It characterized in that to perform.
    [52] A method for driving a liquid crystal display element according to a third invention is, in the second invention, in response to the response of the liquid crystal material between voltage applications adjacent to each other when a plurality of voltages are applied to the liquid crystal material by the simultaneous selection. It is characterized by setting the required time interval.
    [53] In the driving method of the liquid crystal display element according to the fourth aspect of the invention, in the first invention, a plurality of voltages are applied to the liquid crystal material within one selection period in which a part or all of the plurality of pixel electrodes are simultaneously selected. It is characterized by performing.
    [54] The driving method of the liquid crystal display element which concerns on 5th invention is a 4th invention WHEREIN: The said one selection period is longer than the time required for the response of the said liquid crystal substance, It is characterized by the above-mentioned.
    [55] In the driving method of the liquid crystal display element according to the sixth invention, the liquid crystal display according to any one of the first to fifth inventions, wherein the voltage magnitude at the time of initial application of the voltage to the liquid crystal material by the simultaneous selection is the image data. It is characterized by more than the maximum of the voltage applied to the material and different polarities.
    [56] In the driving method of the liquid crystal display device according to the seventh invention, in any one of the first to sixth invention, the voltage magnitude at the time of applying the final voltage to the liquid crystal material by the simultaneous selection is the voltage magnitude of the common electrode It is characterized in that approximately the same as.
    [57] The driving method of the liquid crystal display element according to the eighth invention is the writing process of applying voltage to the liquid crystal material by selective scanning of pixel electrodes of each line according to any one of the first to fifth inventions, and The erasing process for applying a plurality of voltages to the liquid crystal material by simultaneous selection is characterized by performing each frame.
    [58] In the driving method of the liquid crystal display element according to the ninth invention, in the eighth invention, the voltage is applied to the liquid crystal material by the selective scanning at the time of the write processing a plurality of times, and a voltage of the same polarity is applied to each pixel electrode. The liquid crystal material is applied to the corresponding liquid crystal material.
    [59] The method for driving a liquid crystal display device according to the tenth invention is the liquid crystal material according to any one of the first to ninth inventions, characterized in that the ferroelectric liquid crystal or the anti-ferroelectric liquid crystal.
    [60] A liquid crystal display device according to an eleventh invention is a liquid crystal material having spontaneous polarization is enclosed between a common electrode and a plurality of pixel electrodes, and for controlling voltage application to the liquid crystal material corresponding to each of the plurality of pixel electrodes. Liquid crystal display provided with a liquid crystal panel provided with switching means, and a drive unit for performing image processing and erasing processing of image data by applying a voltage to the liquid crystal material corresponding to each of the plurality of pixel electrodes to the liquid crystal panel. The apparatus is characterized in that the driving section has means for applying a voltage to the liquid crystal material a plurality of times by the simultaneous selection of some or all of the plurality of pixel electrodes in the erase process.
    [61] A liquid crystal display device according to a twelfth invention is the liquid crystal display device according to the twelfth invention, wherein the driving portion is adapted to the write processing for performing a plurality of times of voltage application to the liquid crystal material by selective scanning of pixel electrodes of each line, and the simultaneous selection. And the erasing processing for applying a plurality of voltages to the liquid crystal material by each frame is performed.
    [62] In the eleventh invention, the liquid crystal display device according to the thirteenth invention includes a light source that emits white light and a plurality of color filters, and color display by selectively transmitting the light emission from the light source by the color filter. Characterized in that to be made.
    [63] A liquid crystal display device according to a fourteenth invention includes a light source for emitting a plurality of different colors in the eleventh invention, and time-divisionally switches the emission color of the light source in synchronization with on / off driving of the switching means. By doing so, it is possible to perform color display.
    [64] In the first, second, fourth or eleventh invention, a liquid crystal material having spontaneous polarization is enclosed between a common electrode and a pixel electrode, and a liquid crystal provided with switching means for switching a liquid crystal material corresponding to each pixel electrode. The display element is applied at least twice to the liquid crystal material by simultaneous selection (collective selection) of some or all of the pixel electrodes in the erasing process. By applying a voltage by such a plurality of simultaneous selections, it is possible to realize that the display state of each pixel is black display and the accumulated charge amount of the liquid crystal material of each pixel is approximately zero. Specifically, when two voltages are applied, black display of each pixel is realized by the first voltage application, and approximately zero accumulated charge amount of each pixel liquid crystal material is realized by the second voltage application.
    [65] Conventionally, for example, since it is necessary to charge from the voltage value of negative polarity to the voltage value of positive polarity, it is necessary to charge up to 2 times and the selection period of one line was long. In order to offset the accumulated charge amount of the liquid crystal substance by the pixel electrode scanning of the display image data, the positive (+) application and the negative (-) application of the display image data, half of the whole time is required.
    [66] On the other hand, in the first, second, fourth or eleventh invention, the voltage applied to the liquid crystal material by the simultaneous selection of some or all of the pixel electrodes is performed at least twice, so that the accumulated charge amount of the liquid crystal material of each pixel is changed. Since it is set to approximately 0, the time required to offset the bias of the charge with respect to the liquid crystal material can be significantly shortened as compared with the prior art. In addition, since the time required for applying the voltage according to the display image data to the liquid crystal material by the line selection scan becomes half the conventional charge, the charge can be drastically reduced. This means that when the voltage according to the display image data is applied to the liquid crystal material, the accumulated charge amount of the liquid crystal material immediately before application is constant to approximately 0, so that the voltage value of zero or one polarity (+ or-polarity) corresponding to the display image data from the zero is zero. This is because you need to charge until. As described above, since the time required for canceling the accumulated charge amount of the liquid crystal substance of each pixel and the time required for scanning the pixel electrode of the display image data can be significantly reduced, the time contributing to the actual display can be lengthened. It is possible to improve the light utilization efficiency.
    [67] In the third invention, a time interval necessary for the response of the liquid crystal material is set between the application of voltages adjacent to each other by simultaneous selection. Therefore, the liquid crystal response in each pixel can be reliably performed.
    [68] In the fifth invention, the period of simultaneous selection is set longer than the time required for the response of the liquid crystal substance. Therefore, the liquid crystal response in each pixel can be reliably performed.
    [69] In the sixth invention, at the time of initial application of the voltage to the liquid crystal material by simultaneous selection, a voltage of approximately equal to or greater than the maximum value of the applied voltage according to the image data and different in polarity is applied to the liquid crystal. Therefore, the display state of each pixel can be reliably black.
    [70] In the seventh invention, at the time of applying the final voltage to the liquid crystal material by simultaneous selection, a voltage of approximately the same magnitude as that of the common electrode is applied. Therefore, the accumulated charge amount of the liquid crystal substance of each pixel can be reliably set to approximately zero.
    [71] In the eighth or twelfth invention, the erasing processing by applying a plurality of times of voltage by simultaneous selection with the writing processing by pixel electrode scanning of the display image data in each frame is completed. Therefore, a reliable display is attained.
    [72] In the ninth invention, the selective scanning of the pixel electrodes of each line is performed two or more times in one frame period, and a voltage of the same polarity is applied to the liquid crystal material of each pixel. Conventionally, the selective scanning of each pixel electrode for displaying image data within one frame period is one time, and the reversal of spontaneous polarization occurs by the charge accumulated in the liquid crystal material of each pixel by the one selective scanning. , The liquid crystal material responds. At this time, the inversion of the spontaneous polarization lowers the amount of charges of the liquid crystal substance of each pixel, thereby lowering the inversion speed of the spontaneous polarization. Therefore, in order to completely invert spontaneous polarization within a certain period, only a spontaneous polarization liquid crystal material having a small amount of charge required for inversion can be used. On the other hand, in the ninth invention, the amount of charge accumulated in the liquid crystal material of each pixel by the first selective scanning is lowered by the inversion of the spontaneous polarization, and the inversion of the spontaneous polarization, that is, the response of the liquid crystal material is almost stopped. Even in this case, since charges accumulate again in the liquid crystal material of each pixel by the second and subsequent selective scans, inversion of spontaneous polarization (response of the liquid crystal material) occurs again, and the light transmittance changes. That is, the total amount of charges that can be consumed within one frame period can be increased without increasing the voltage applied to the liquid crystal material. As a result, it becomes possible to drive the liquid crystal material with large spontaneous polarization. In addition, in the case of a liquid crystal material having spontaneous polarization of the same size, the driving voltage can be reduced by such two or more selective scans. In addition, it is possible to apply a low voltage driving driver, and to reduce the cost.
    [73] In the tenth invention, a ferroelectric liquid crystal or an antiferroelectric liquid crystal is used as the liquid crystal material. Thus, high speed on / off control is possible.
    [74] In the thirteenth invention, color display can be performed by selectively transmitting white light from a light source by a plurality of color filters.
    [75] In the fourteenth aspect of the invention, a field-sequencial method is used without using a color filter by time-divisionally switching the emission color of a light source that emits three primary colors in synchronism with the on / off driving of the switching means. Color display can be performed by.
    [76] EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated concretely with reference to drawings which showed embodiment. In addition, this invention is not limited to the following embodiment.
    [77] 1 is a block diagram showing an overall configuration of a liquid crystal display device according to the present invention, FIG. 2 is a schematic perspective view showing a configuration example of a liquid crystal panel and a backlight, and FIG. 3 is a schematic cross-sectional view of the liquid crystal panel.
    [78] As shown in FIG. 3, the liquid crystal panel 1 has a glass substrate having an RGB color filter / black matrix 3 arranged in a lattice shape with a common electrode 2 from an upper layer (surface) side to a lower layer (back side) side. (4) and the glass substrate 6 which has the TFT electrode 21 (refer FIG. 2) connected to each of the pixel electrode 5 and the pixel electrode 5 arranged in the grid | lattice form, are laminated | stacked, and it is comprised, and is a glass substrate The alignment film 7 is disposed on the upper surface of the pixel electrode 5 on the (6), and the alignment film 8 is disposed on the lower surface of the RGB color filter / black matrix 3. The ferroelectric liquid crystal is formed between the alignment films 7 and 8, respectively. The liquid crystal material is filled to form the liquid crystal layer 9. Reference numeral 10 is a spacer for maintaining the layer thickness of the liquid crystal layer 9. As shown in FIG. 2, this liquid crystal panel 1 is sandwiched by two polarizing films 11 and 12, and a backlight 26 is provided below the liquid crystal panel 1.
    [79] Each pixel electrode 5 is selectively driven by on / off control of the TFT 21, and each TFT 21 scans a signal input to the signal line 23 through the data driver 22 (scan driver). The scan signals supplied sequentially from 24 to the line are input to the scanning line 25 to selectively turn on / off. The transmitted light intensity of each pixel is controlled by the voltage supplied through the TFT 21. The backlight 26 composed of a light source 26a for emitting white light and a light guide and a light diffusion plate 26b is located on the lower layer (back side) side of the liquid crystal panel 1 and driven by the backlight power supply circuit 27.
    [80] The image memory 31 inputs display data to be displayed by the liquid crystal panel 1 from, for example, an external device such as a personal computer. The control signal generation circuit 32 generates a synchronization control signal for synchronizing various processes, and generates the generated synchronization control signal in the image memory 31, the data driver 22, the scan driver 24, and the reference voltage generation circuit. (33) to the common electrode voltage generating circuit 34 and the backlight power supply circuit 27.
    [81] The image memory 31 stores the display data once, and then sends the display data to the data driver 22 in synchronization with the synchronization control signal. The reference voltage generating circuit 33 generates reference voltages for the data driver 22 and the scan driver 24, respectively, and outputs them to each driver. The common electrode voltage generation circuit 34 generates the common electrode voltage V com , applies it to the common electrode 2, and outputs it to the data driver 22.
    [82] In the write process, the data driver 22 outputs a signal to the signal line 23 of the pixel electrode 5 based on the image data output from the image memory 31. The scan driver 24 sequentially scans the scan line 25 of the pixel electrode 5 for each line. The TFT 21 is driven in accordance with the signal output from the data driver 22 and the scan of the scan driver 24, and a voltage is applied to the pixel electrode 5, so that the liquid crystal layer 9 corresponding to the pixel electrode 5 is applied. Transmitted light intensity is controlled.
    [83] In the erasing process, on the other hand, all the pixel electrodes 5 are simultaneously selected (collectively selected) and at least two voltage applications are performed. At this time, when the first voltage is applied, a voltage having a polarity that is substantially equal to or greater than the maximum value of the voltage according to the image data and having a different polarity is applied to the liquid crystal to bring the display states of all the pixel electrodes 5 to a black state. do. At this time, at the time of the final voltage application, a voltage of a potential substantially equal to the common electrode voltage V com is applied to make the accumulated charge amount of the liquid crystals in all the pixel electrodes 5 approximately zero.
    [84] Next, specific embodiment of this invention is described. In addition, the following Embodiments 1 to 4 relate to the second and third inventions, and at the time of data erasing processing, all the pixel electrodes are simultaneously selected a plurality of times (preferably two or three times), and each selection is performed. By applying a voltage to the liquid crystal within the period, the voltage can be applied to the liquid crystal by the simultaneous selection of all the pixel electrodes a plurality of times (two or three times). At this time, a time period during which the liquid crystal sufficiently responds between voltage applications adjacent to each other is set.
    [85] In addition, the following Embodiments 5 to 8 relate to the fourth and fifth inventions, in which all the pixel electrodes are selected once at the same time in the data erasing process, and the voltage is applied to the liquid crystal a plurality of times (preferably in the selection period). 2 times), it is an example that voltage application to the liquid crystal by simultaneous selection of all the pixel electrodes can be performed multiple times (two times). At this time, this selection period is set longer than the time for the liquid crystal to sufficiently respond.
    [86] (Embodiment 1)
    [87] First, the liquid crystal panel 1 shown in FIG. 2 and FIG. 3 is produced as follows. After cleaning the TFT substrate having the pixel electrode 5 (pixel number 800 × 600, 12.1 × 12.1 inch), and the common electrode substrate having the common electrode 2 and the RGB color filter / black matrix 3, the polyimide Is applied and calcined at 200 ° C. for 1 hour to form a film of about 200 GPa as the alignment films 7 and 8.
    [88] In addition, these alignment films 7 and 8 are rubbed with a rayon fabric, and the empty panels are overlapped with each other in a state where a gap is maintained by the spacer 10 made of silica having an average particle diameter of 1.6 µm. To make. A ferroelectric liquid crystal material (e.g., a material disclosed in A. Mochizuki, et.al .: Ferroelectrics, 133, 353 (1991)) containing a naphthalene-based liquid crystal as a main component is enclosed in this blank panel to form a liquid crystal layer 9. . The spontaneous polarization size of the enclosed ferroelectric liquid crystal material is 6 nC / cm 2.
    [89] The produced panel is dark when the long axis direction of the ferroelectric liquid crystal molecules of the liquid crystal layer 9 is inclined to one side by two polarizing films 11 and 12 in a cross-Nicol state. The liquid crystal panel 1 to be in the () state. The liquid crystal panel 1 and the backlight 26 are overlapped to form a liquid crystal display device.
    [90] Then, the TFTs 21 of the pixel electrodes 5 are driven for each line in accordance with the driving procedures shown in FIGS. 4 and 6 to apply a voltage corresponding to the image data. The selection period in each line is 7 s, and the time required for the entire recording process is (7 x n) s (n is the number of lines). In the conventional driving procedure shown in Fig. 24, the selection period in each line is 13 ms, which makes it possible to achieve higher speed than in the prior art. In addition, the scanning order of the lines is reversed between frames adjacent to each other so that non-uniformity of the screen luminance does not occur. In addition, data erasure scanning was performed twice.
    [91] The maximum applied voltage to the liquid crystal according to the image data is (applied voltage (V com ) +7) V to the common electrode 2, and simultaneous selection of all pixel electrodes at the time of erasing processing (collective selection of all lines) The first applied voltage to the liquid crystal by means of (V com -7) V, and the second applied voltage is equal to V com . In addition, a time interval of 500 ms is set between the first voltage application and the second voltage application in which the liquid crystal can sufficiently respond. The time of one frame is 1 / 60s, and in each of these frames, two voltage application processes (erase processing) to the liquid crystal by simultaneous selection of the image data and all pixel electrodes are completed. The backlight 26 always lights up.
    [92] As a result, the time contributing to screen brightness (part not shown by hatching in FIG. 4) is longer than that of the conventional example of FIG. 24, and the light utilization efficiency (screen luminance / Percentage of backlight brightness) can be realized, and a bright and clear display is obtained. Moreover, the burn-in of display was also suppressed by the erasing process of this invention, since the charge amount of the liquid crystal was set to about zero and the bias of charge was eliminated.
    [93] (Embodiment 2)
    [94] The liquid crystal panel 1 manufactured on the same conditions as Embodiment 1, and the backlight 26 which consists of LED which is easy to switch are superimposed, and a liquid crystal display device is comprised.
    [95] Then, the TFTs 21 of the pixel electrodes 5 are driven for each line in accordance with the driving procedures shown in FIGS. 5 and 6 to apply a voltage corresponding to the image data. The selection period in each line is 7 ms. In addition, data erasure scanning is performed twice.
    [96] The maximum applied voltage to the liquid crystal according to the image data is (V com +7) V, and the initial applied voltage to the liquid crystal by simultaneous selection of all the pixel electrodes in the erasing process (collective selection of all lines) is (V com- 8) V and the second applied voltage are the same as V com . In addition, a time interval of 500 ms is set between the first voltage application and the second voltage application in which the liquid crystal can sufficiently respond. The time of one frame was set to 1 / 60s, and two voltage application processes (erasing processes) to the liquid crystal by simultaneous selection of the image data and all pixel electrodes were completed in each of these frames.
    [97] The backlight 26 is turned on only after the data write scan to all the pixel electrodes as shown in FIG. By doing in this way, the utilization efficiency of the backlight 26 can be improved.
    [98] As a result, the light utilization efficiency of 12% superior to the conventional example (6%) and the first embodiment (10%) can be realized, and bright and clear display can be obtained. In addition, burn-in of the display was also suppressed similarly to the first embodiment.
    [99] (Embodiment 3)
    [100] Similar to Embodiment 1, the TFT substrate having the pixel electrode 5 (the number of pixels 800 × 600, 12.1 × 12.1 inches), and the common electrode substrate having the common electrode 2 and the RGB color filter / black matrix 3 After washing, the polyimide was applied and baked at 200 ° C. for 1 hour to form a film of about 200 GPa as the alignment films 7 and 8.
    [101] In addition, these alignment films 7 and 8 are rubbed with a rayon fabric, and a blank panel is produced by superimposing them with the spacer 10 made of silica with an average particle diameter of 1.6 mu m between them. A ferroelectric liquid crystal material (e.g., a material disclosed in A. Mochizuki, et.al .: Ferroelectrics, 133, 353 (1991)) containing a naphthalene-based liquid crystal as a main component is enclosed in this blank panel to form a liquid crystal layer 9. . The spontaneous polarization size of the enclosed ferroelectric liquid crystal material was 11 nC / cm 2.
    [102] The produced panel is sandwiched between two polarizing films 11 and 12 in a cross nicol state so as to become a dark state when the major axis direction of the ferroelectric liquid crystal molecules of the liquid crystal layer 9 is inclined to one side, thereby sandwiching the liquid crystal panel ( 1) The liquid crystal panel 1 and the backlight 26 are overlapped to form a liquid crystal display device.
    [103] Then, the TFTs 21 of the pixel electrodes 5 are driven for each line in the driving order shown in Figs. 7 and 9 to apply the voltage according to the image data twice. The selection period in each line is 7 ms. In addition, similarly to the first embodiment, the scanning order of lines is reversed between frames adjacent to each other so that non-uniformity of screen luminance does not occur. Further, data erase scan is performed three times.
    [104] The maximum applied voltage to the liquid crystal according to the image data is (V com +7) V, and the first and second application to the liquid crystal by simultaneous selection of all the pixel electrodes in the erasing process (collective selection of all lines). The voltage is set at (V com -7) V and the applied voltage at the third time is the same as V com . Further, between this first voltage application and the second voltage application, and between the second voltage application and the third voltage application, a time interval of 300 ms at which the liquid crystal can sufficiently respond is set, respectively. The time of one frame was set to 1 / 60s, and in each of these frames, three voltage application processes (erase processing) to the liquid crystal by simultaneous selection of the image data and all pixel electrodes were completed. The backlight 26 was always lit.
    [105] As a result, even when a ferroelectric liquid crystal with large spontaneous polarization is used, it is possible to drive at a driving voltage (7V) lower than that of the conventional example (12V), and at the same time, a light utilization efficiency of 9% superior to the conventional example (6%) can be realized. Bright and clear markings were obtained. In addition, burn-in of the display was also suppressed similarly to the first embodiment.
    [106] (Embodiment 4)
    [107] The liquid crystal panel 1 manufactured on the same conditions as Embodiment 3 and the backlight 26 which consists of LEDs which are easy to switch were superimposed, and the liquid crystal display device was comprised.
    [108] Then, the TFTs 21 of the pixel electrodes 5 are driven for each line in the driving order shown in Figs. 8 and 9 to apply a voltage corresponding to the image data. The selection period in each line is 7 ms. Further, data erase scan is performed three times.
    [109] The maximum applied voltage to the liquid crystal according to the image data is (V com +7) V, and the first and second application to the liquid crystal by simultaneous selection of all the pixel electrodes in the erasing process (collective selection of all lines). The voltage is set at (V com -7) V and the applied voltage at the third time is the same as V com . Further, between this first voltage application and the second voltage application, and between the second voltage application and the third voltage application, a time interval of 300 ms at which the liquid crystal can sufficiently respond is set, respectively. The time of one frame is 1 / 60s, and in each of these frames, three voltage application processes (erasing processes) to the liquid crystal by simultaneous selection of the image data and all pixel electrodes are completed.
    [110] The backlight 26 is turned on only after the second data write scan to all the pixel electrodes as shown in FIG. By doing in this way, the utilization efficiency of the backlight 26 can be improved.
    [111] As a result, even with a ferroelectric liquid crystal having a large spontaneous polarization, it is possible to drive at a low driving voltage of 7 V, and at the same time, it is possible to realize an optical utilization efficiency of 11% superior to that of the conventional example (6%) and the third embodiment (9%). And a bright and clear display can be obtained. In addition, burn-in of the display was obtained similarly to the first embodiment.
    [112] (Embodiment 5)
    [113] First, the liquid crystal panel 1 shown in FIG. 2 and FIG. 3 is produced as follows. After cleaning the TFT substrate having the pixel electrode 5 (pixel number 800 × 600, 12.1 × 12.1 inch), and the common electrode substrate having the common electrode 2 and the RGB color filter / black matrix 3, the polyimide Is applied and baked at 200 ° C. for 1 hour to form a film of about 200 kV of polyimide as the alignment films 7 and 8.
    [114] In addition, these alignment films 7 and 8 are rubbed with a rayon fabric, and a blank panel is produced by superimposing them with the spacer 10 made of silica with an average particle diameter of 1.6 mu m between them. The rubbing direction is antiparallel. A bistable ferroelectric liquid crystal material is enclosed in the empty panel to form a liquid crystal layer 9. The spontaneous polarization size of the enclosed ferroelectric liquid crystal material is 6 nC / cm 2.
    [115] The produced panel is sandwiched between two polarizing films 11 and 12 in a cross nicol state so as to become a dark state when the major axis direction of the ferroelectric liquid crystal molecules of the liquid crystal layer 9 is inclined to one side, thereby sandwiching the liquid crystal panel ( 1) The liquid crystal panel 1 and the backlight 26 are overlapped to form a liquid crystal display device.
    [116] Then, the TFTs 21 of the pixel electrodes 5 are driven for each line in accordance with the driving procedures shown in FIGS. 10 and 12 to apply a voltage corresponding to the image data. The selection period in each line is 7 s, and the time required for the entire recording process is (7 x n) s (n is the number of lines). The speed can be increased as compared with 13 ms of selection period in each line of the conventional drive sequence shown in FIG. In addition, the scanning order of the lines is reversed between frames adjacent to each other so that non-uniformity of the screen luminance does not occur. The data erase scan was performed once.
    [117] The maximum applied voltage to the liquid crystal according to the image data is (V com +7) V, and the initial applied voltage to the liquid crystal by simultaneous selection of all the pixel electrodes in the erasing process (collective selection of all lines) is (V com- 7) V and the second applied voltage are the same as V com . In addition, the simultaneous selection time of all the pixel electrodes is set to 300 mW with which the liquid crystal can sufficiently respond, and the initial voltage application time is set to 280 mW and the second voltage application time is 20 mW. The time of one frame is 1 / 60s, and in each of these frames, the process of writing the image data and the two voltage application processes to the liquid crystal by simultaneous selection of all the pixel electrodes are completed. The backlight 26 always lights up.
    [118] As a result, the time (part not shown by hatching in FIG. 10) contributing to the screen brightness is longer than that of the conventional example of FIG. 24, and light utilization efficiency of 10% superior to the conventional example (6%) can be realized, and it is bright and clear. One mark was obtained. In addition, burn-in of the display was also suppressed similarly to the first embodiment.
    [119] Embodiment 6
    [120] A blank panel is produced under the same conditions as in the fifth embodiment. However, rubbing direction shall be parallel. A monostable ferroelectric liquid crystal material is enclosed in this blank panel to form a liquid crystal layer 9. The spontaneous polarization size of the enclosed ferroelectric liquid crystal material is 6 nC / cm 2.
    [121] The produced panel is sandwiched between two polarizing films 11 and 12 in the cross nicol state so as to become dark when the major axis direction of the ferroelectric liquid crystal molecules of the liquid crystal layer 9 is in the direction when no voltage is applied. It is set as the liquid crystal panel 1. The liquid crystal panel 1 and the backlight 26 are overlapped to form a liquid crystal display device.
    [122] Then, the TFTs 21 of the pixel electrodes 5 are driven for each line in accordance with the driving procedures shown in FIGS. 11 and 12 to apply a voltage corresponding to the image data. The selection period in each line is 7 ms. Data erasure scanning is performed once.
    [123] The maximum applied voltage to the liquid crystal according to the image data is (V com +7) V, and the initial applied voltage to the liquid crystal by simultaneous selection of all the pixel electrodes in the erasing process (collective selection of all lines) is (V com- 8) V and the second applied voltage are the same as V com . In addition, the simultaneous selection time of all the pixel electrodes is set to 250 mW that the liquid crystal can sufficiently respond to, and the first voltage application time is 225 mW and the second voltage application time is 25 mW. The time of one frame is 1 / 60s, and in each of these frames, the process of writing the image data and the two voltage application processes to the liquid crystal by simultaneous selection of all the pixel electrodes are completed.
    [124] The backlight 26 is turned on only after the data write scan to all the pixel electrodes as shown in FIG. By doing in this way, the utilization efficiency of the backlight 26 can be improved.
    [125] As a result, the light utilization efficiency of 12% superior to the conventional example (6%) and the fifth embodiment (10%) can be realized, and bright and clear display can be obtained. In addition, burn-in of the display was also suppressed similarly to the first embodiment.
    [126] (Embodiment 7)
    [127] A blank panel is produced on the same conditions as in the sixth embodiment. Then, a bistable ferroelectric liquid crystal material is enclosed in this empty panel to form a liquid crystal layer 9. The spontaneous polarization size of the enclosed ferroelectric liquid crystal material is 11 nC / cm 2.
    [128] The produced panel is sandwiched between two polarizing films 11 and 12 in a cross nicol state so as to become a dark state when the major axis direction of the ferroelectric liquid crystal molecules of the liquid crystal layer 9 is inclined to one side, thereby sandwiching the liquid crystal panel ( 1) The liquid crystal panel 1 and the backlight 26 are overlapped to form a liquid crystal display device.
    [129] Then, the TFTs 21 of the pixel electrodes 5 are driven for each line in accordance with the driving procedures shown in FIGS. 13 and 15, and a voltage corresponding to the image data is applied twice. The selection period in each line is 7 ms. In addition, the scanning order of the lines is reversed between frames adjacent to each other so that non-uniformity of the screen luminance does not occur. Data erasure scanning is performed once.
    [130] The maximum applied voltage to the liquid crystal according to the image data is (V com +7) V, and the initial applied voltage to the liquid crystal by simultaneous selection of all the pixel electrodes in the erasing process (collective selection of all lines) is (V com- 7) V and the second applied voltage are the same as V com . In addition, the simultaneous selection time of all the pixel electrodes is set to 200 mV with which the liquid crystal can sufficiently respond, and the initial voltage application time is 180 msec and the second voltage application time is 20 msec. The time of one frame is 1 / 60s, and in each of these frames, the process of writing the image data and the two voltage application processes to the liquid crystal by simultaneous selection of all the pixel electrodes are completed.
    [131] As a result, even when a ferroelectric liquid crystal with large spontaneous polarization is used, it is possible to drive at a driving voltage (7V) lower than that of the conventional example (12V), and at the same time, a light utilization efficiency of 9% superior to the conventional example (6%) can be realized. Bright and clear markings were obtained. In addition, burn-in of the display was also suppressed similarly to the first embodiment.
    [132] Embodiment 8
    [133] A blank panel is produced under the same conditions as in the fifth embodiment. A monostable ferroelectric liquid crystal material is enclosed in this empty panel to form a liquid crystal layer 9. The spontaneous polarization size of the encapsulated ferroelectric liquid crystal material is 11 nC / cm 2.
    [134] The produced panel is sandwiched between two polarizing films 11 and 12 in the cross nicol state so as to become dark when the major axis direction of the ferroelectric liquid crystal molecules of the liquid crystal layer 9 is in the direction when no voltage is applied. It is set as the liquid crystal panel 1. The liquid crystal panel 1 is overlaid with a backlight 26 made of easy-to-switch LEDs to form a liquid crystal display device.
    [135] Then, the TFTs 21 of the pixel electrodes 5 are driven for each line in accordance with the driving procedures shown in FIGS. 14 and 15, and the voltage corresponding to the image data is applied twice. The selection period in each line is 7 ms. Data erasure scanning is performed once.
    [136] The maximum applied voltage to the liquid crystal according to the image data is (V com +7) V, and the initial applied voltage to the liquid crystal by simultaneous selection of all the pixel electrodes in the erasing process (collective selection of all lines) is (V com- 7) V and the second applied voltage are the same as V com . In addition, the simultaneous selection time of all the pixel electrodes is set to 200 mV with which the liquid crystal can sufficiently respond, and the initial voltage application time is 180 msec and the second voltage application time is 20 msec. The time of one frame is 1 / 60s, and in each of these frames, the process of writing the image data and the two voltage application processes to the liquid crystal by simultaneous selection of all the pixel electrodes are completed.
    [137] As a result, even when a ferroelectric liquid crystal having a large spontaneous polarization is used, it is possible to drive at a driving voltage (7V) lower than that of the conventional example (12V), and at the same time, it is possible to realize light utilization efficiency of 11% superior to the conventional example (6%). Bright and clear markings were obtained. In addition, burn-in of the display was also suppressed similarly to the first embodiment.
    [138] (Embodiment 9)
    [139] In the above-described example, a case has been described in which a color display is realized by using a light source 26a of white light and selectively transmitting white light by a color filter. However, a light source that emits a plurality of colors is used for the backlight. The present invention can be similarly applied to a field-sequential liquid crystal display device in which the emission color of the backlight is switched and the color emission is synchronized by switching the emission color and switching the liquid crystal.
    [140] FIG. 16: is a schematic diagram which shows the structural example of the light source 26c in the liquid crystal display of such a field-sequential system. This light source 26c is sequentially arranged by LEDs emitting three primary colors, i.e., red (R), green (G), and blue (B), on the surface facing the light guide and the light diffusion plate 26b. LED array. The backlight 26 is comprised by this light source 26c (LED array) and the light guide and the light diffusion plate 26b.
    [141] Then, one frame of 1/60 second is divided into three frames of 1/180 second, and each of the first to third subframes emits red, green, and blue LEDs in turn. Color display is performed by switching each pixel line by line in synchronization with such sequential light emission. One or two data write scans and one or two data erase scans are performed in each of the red, green, and blue subframes. Examples of such driving sequence are shown in FIGS. 17 to 22. In the example shown in Figs. 17, 18 and 21, one data write scan and two data erase scans are performed. In the example shown in Figs. 19, 20 and 22, two data write scans and one data erase scan are performed. Do it.
    [142] In the ninth embodiment, at the time of data erasing in each subframe, all the pixel electrodes are simultaneously selected by the driving sequence as shown in Figs. 6, 9, 12, or 15 described above. Voltage application to them is performed multiple times.
    [143] In the above-described example, the pixel electrodes of all the lines are simultaneously selected to apply a voltage. However, the pixel states of the plurality of lines are simultaneously selected and voltages are repeatedly applied to repeat the display state of each pixel. It is also possible to realize that the display and the accumulated charge amount of the liquid crystal of each pixel are approximately zero.
    [144] Moreover, although the case where bistable and monostable ferroelectric liquid crystals were used as a liquid crystal material was demonstrated, semiferroelectric liquid crystal or other liquid crystal material (nematic liquid crystal, cholesteric liquid crystal, etc.) can also be applied.
    [145] As described above, in the present invention, since the voltage is applied to the liquid crystal by the simultaneous selection of some or all of the pixel electrodes at the time of the erasing process, the light utilization efficiency can be improved. In addition, by the erasing process of the present invention, since the charge amount of the liquid crystal is set to approximately 0 to eliminate the bias of the charge, burn-in of the display can be suppressed.
    [146] In addition, since the application of the voltage to the liquid crystal in accordance with the image data is performed a plurality of times during the recording process, a liquid crystal material having high spontaneous polarization with excellent responsiveness can be used, and the driving voltage can be reduced.
    权利要求:
    Claims (5)
    [1" claim-type="Currently amended] A liquid crystal material having spontaneous polarization is enclosed between the common electrode and the plurality of pixel electrodes, and a switching means for controlling voltage application to the liquid crystal material corresponding to each of the plurality of pixel electrodes is provided. In the driving method of a liquid crystal display element which performs recording and erasing processing of image data by applying a voltage to the liquid crystal material corresponding to each of the plurality of pixel electrodes,
    In the erasing process, a plurality of times of applying voltage to the liquid crystal material by the simultaneous selection of a part or all of the plurality of pixel electrodes is performed a plurality of times, and the part or all of the plurality of pixel electrodes are simultaneously selected. In each of the selection period, a voltage is applied to the liquid crystal material.
    [2" claim-type="Currently amended] A liquid crystal material having spontaneous polarization is enclosed between the common electrode and the plurality of pixel electrodes, and a switching means for controlling voltage application to the liquid crystal material corresponding to each of the plurality of pixel electrodes is provided. In the driving method of a liquid crystal display element which performs recording and erasing processing of image data by applying a voltage to the liquid crystal material corresponding to each of the plurality of pixel electrodes,
    In the erasing process, one time of applying voltage to the liquid crystal material by the simultaneous selection of a part or all of the plurality of pixel electrodes is performed a plurality of times, and the part or all of the plurality of pixel electrodes are simultaneously selected. A method of driving a liquid crystal display device, characterized in that the voltage is applied to the liquid crystal material a plurality of times within a selection period.
    [3" claim-type="Currently amended] The method of claim 2,
    And wherein said one selection period is longer than the time required for the response of said liquid crystal material.
    [4" claim-type="Currently amended] A liquid crystal panel in which a liquid crystal material having spontaneous polarization is enclosed between the common electrode and the plurality of pixel electrodes, and switching means for controlling voltage application to the liquid crystal material corresponding to each of the plurality of pixel electrodes is provided; In the liquid crystal display device provided with the drive part which performs the recording process and the erasing process of image data by applying the voltage to the said liquid crystal substance corresponding to each of the said some pixel electrode with respect to the said liquid crystal panel,
    The driving unit has a means for applying voltage to the liquid crystal material a plurality of times by the simultaneous selection of some or all of the plurality of pixel electrodes in the erasing process, the light source emitting white light and a plurality of color filters. And a color display by selectively transmitting light emission from the light source by the color filter.
    [5" claim-type="Currently amended] A liquid crystal panel in which a liquid crystal material having spontaneous polarization is enclosed between the common electrode and the plurality of pixel electrodes, and switching means for controlling voltage application to the liquid crystal material corresponding to each of the plurality of pixel electrodes is provided; In the liquid crystal display device provided with the drive part which performs the recording process and the erasing process of image data by applying the voltage to the said liquid crystal substance corresponding to each of the said some pixel electrode with respect to the said liquid crystal panel,
    The driving unit has a means for applying a voltage to the liquid crystal material a plurality of times by the simultaneous selection of some or all of the plurality of pixel electrodes during the erasing process, and has a light source for emitting a plurality of different colors And time-divisionally switching the light emission color of the light source in synchronization with on / off driving of the switching means to perform color display.
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    同族专利:
    公开号 | 公开日
    KR100804116B1|2008-02-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2002-02-18|Priority to JP2002040677A
    2002-02-18|Priority to JPJP-P-2002-00040677
    2002-09-23|Application filed by 후지쯔 가부시끼가이샤
    2003-08-25|Publication of KR20030069031A
    2008-02-18|Application granted
    2008-02-18|Publication of KR100804116B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP2002040677A|JP3859524B2|2001-04-18|2002-02-18|Method for driving liquid crystal display element and liquid crystal display device|
    JPJP-P-2002-00040677|2002-02-18|
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