Reflective and semi-transparent type liquid crystal display device

专利摘要:
The present invention relates to a reflective and semi-transmissive liquid crystal display device which is formed to extend the reflective electrode to the outer edge of the array to prevent light leakage from the backlight. In the outer portion, a liquid crystal layer formed between the first and second substrates, the first and second substrates, a gate insulating film formed on the entire surface including the gate line and the gate line on the first substrate, A data line formed on the gate insulating film so as to be orthogonal to the gate line, a protective film formed on the gate insulating film including the data line, an insulating film formed on the protective film, and an outer edge of the array formed on the insulating film to extend the backlight. And a reflective electrode for reflecting light to prevent leakage and a color filter layer formed on the second substrate. It is characterized in that the configuration.
公开号:KR20020030428A
申请号:KR1020000061049
申请日:2000-10-17
公开日:2002-04-25
发明作者:박성일；정재영
申请人:구본준, 론 위라하디락사；엘지.필립스 엘시디 주식회사；
IPC主号:

专利说明:

Reflective and transflective liquid crystal display device {REFLECTIVE AND SEMI-TRANSPARENT TYPE LIQUID CRYSTAL DISPLAY DEVICE}
[12] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to liquid crystal display devices (LCDs), and more particularly to structures of reflective and semi-transmissive liquid crystal display devices that prevent light leakage.
[13] In general, a liquid crystal display device may be classified into two types, a transmissive liquid crystal display device using a backlight as a light source and a reflective liquid crystal display device using natural light without using the backlight as a light source. Although it realizes a bright image even in a dark external environment by using it, there is a problem in that power consumption by using a backlight is large. On the other hand, the reflection type liquid crystal display device consumes less power because it does not use a backlight, but there is a limit that it cannot be used when the external natural light is dark.
[14] As an alternative to overcome this limitation, a semi-transmissive liquid crystal display device has a reflecting portion and a transmitting portion at the same time in a unit pixel, so that both a reflection type and a transmission type can be used as necessary.
[15] That is, when the external natural light is bright enough to enable the display function without using the backlight, the external light incident through the first substrate is reflected by the reflective electrode to operate as a reflective liquid crystal display device, and when the external light is not bright, the backlight is turned on. The light of the backlight enters into the liquid crystal layer through the opening or depression of the reflective electrode and acts as a transmissive liquid crystal display device.
[16] Hereinafter, the structure of a reflective and transflective liquid crystal display device according to the prior art will be described with reference to the accompanying drawings.
[17] 1 is a plan view of a reflective and transflective liquid crystal display device according to the prior art, and FIG. 2 is a plan view of an outer portion of a first array of the reflective and transflective liquid crystal display device according to the prior art. 3 is a cross-sectional view illustrating the AA ′ cutting surface of FIG. 2.
[18] As shown in FIG. 1, a general liquid crystal display device is largely divided into an array part, an array outer part, and a pad part, and the pad part is further divided into a gate pad part and a data pad part. A portion of the outer edge of the array to which the data lines are linked is called an outer edge of the first array, and a portion of the edge of the array to which the data line is linked is called an outer edge of the second array.
[19] Referring to FIG. 3, the array unit includes a liquid crystal layer 13 formed by being injected between the first and second substrates 11 and 12, the first and second substrates 11 and 12, and the first substrate. A gate line 17 arranged in parallel on the substrate 11 at regular intervals, a gate insulating film 14 formed on the entire surface including the gate line 17, and a gate line 17 formed on the gate insulating film 14. A thin film transistor formed at an intersection point of the gate line and the data line 15 and a passivation layer 16 formed on the entire surface including the thin film transistor. ), A pixel electrode formed by electrically connecting the thin film transistor at a predetermined portion on the passivation layer 16, a color filter layer formed to express colors on the second substrate, and an opening formed between the color filter layer and the opening. It consists of a black matrix formed to prevent light from leaking out of the direction.
[20] In this case, when the liquid crystal display is a reflective LCD, the pixel electrode is formed of only a reflective electrode, and in the case of a transflective LCD, the pixel electrode includes a transmissive electrode, a reflective electrode, and an insulating layer for electrically separating the transmissive electrode and the reflective electrode.
[21] In addition, the gate line and the data line 15 extend to the gate pad portion and the data pad portion, respectively, and the number of lines is so large that as shown in FIG. The liquid crystal display device is connected to an external driving circuit through the pad part.
[22] However, when the backlight is incident from the bottom of the first substrate, the liquid crystal display has a problem of light leaking from the backlight between the linking lines of the outer edge of the array and the edge surface of the second substrate.
[23] Thus, in order to solve the above problem, as illustrated in FIGS. 1 and 2, a black matrix 19 is further provided on the outer periphery of the array of the second substrate.
[24] The black matrix is formed by depositing chromium (Cr) or chromium oxide (CrOx) and the like. Since the chromium is a metal, it has advantages such as high definition, a thin film thickness, and a low resistance. Reflections can cause eye strain and make the screen unsatisfactory.
[25] However, the conventional reflective and transflective liquid crystal display devices have the following problems.
[26] As shown in FIG. 3, the backlight is reflected by the black matrix layer provided to prevent a backlight leaking between the linking lines of the outer edge of the array and the edge surface of the second substrate.
[27] The present invention has been made to solve the above problems and to provide a reflective and semi-transmissive liquid crystal display device in which a reflective electrode, which acts as a reflector instead of a black matrix, extends to the outer edge of the array to prevent light leakage from the outer edge of the array. The purpose is.
[1] 1 is a plan view of a reflective and transflective liquid crystal display device according to the prior art;
[2] 2 is a plan view of an outer periphery of a first array of a reflective and transflective liquid crystal display device according to the prior art;
[3] 3 is a cross-sectional view taken along the line AA ′ of FIG. 2.
[4] 4A is a cross-sectional view illustrating an outer portion of a first array of the reflective and transflective liquid crystal display device according to the present invention;
[5] 4B is a cross-sectional view illustrating an outer portion of a second array of the reflective and transflective liquid crystal display device according to the present invention;
[6] * Explanation of symbols on the main parts of the drawings
[7] 21: first substrate 22: second substrate
[8] 23 liquid crystal layer 24 gate insulating film
[9] 25: data line 26: protective film
[10] 27 insulating film 28 reflective electrode
[11] 29 color filter layer 30 gate line
[28] Reflective and semi-transmissive liquid crystal display devices of the present invention for achieving the above object, in the array portion and the outer peripheral portion of the reflective and transflective liquid crystal display device, the first and second substrates, the first, A liquid crystal layer formed between the second substrate, a gate insulating film formed on the entire surface including the gate line, the gate line on the first substrate, a data line formed on the gate insulating film so as to be orthogonal to the gate line, and the data A protective film formed on the gate insulating film including lines, an insulating film formed on the protective film, a reflective electrode formed on the insulating film so as to extend to the outer periphery of the array, and reflecting the backlight to prevent light leakage; Characterized in that it comprises a formed color filter layer.
[29] Hereinafter, the liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.
[30] FIG. 4A is a cross-sectional view illustrating the outer periphery of the first array of the reflective and transflective liquid crystal display according to the present invention, and FIG. 4B is a cross-sectional view illustrating the outer periphery of the second array of the reflective and transflective liquid crystal display according to the present invention.
[31] 4A and 4B, the reflective liquid crystal display device according to the present invention is a liquid crystal formed by being injected between the first and second substrates 21 and 22 and the first and second substrates 21 and 22. A layer 23, a gate line 30 arranged in parallel on the first substrate 21 at regular intervals, a gate insulating film 24 formed on the entire surface including the gate line 30, and the gate insulating film A data line 25 formed on (24) to form a matrix structure with the gate line 30 to separate a unit pixel region, and a thin film transistor formed at an intersection point of the gate line and the data line 30 and 25; And a passivation layer 26 formed on the entire surface including the thin film transistor, a pixel electrode formed by being electrically connected to the thin film transistor at a predetermined portion on the passivation layer 26, and a color filter layer formed to express color on the second substrate. By phrase It is.
[32] At this time, if the liquid crystal display device is a reflective LCD, the pixel electrode is formed of only the reflective electrode 28. If the LCD is a semi-transmissive LCD, the transmissive electrode, the reflective electrode 28, and the insulating film electrically separating the transmissive electrode and the reflective electrode (27) is made.
[33] Here, the reflecting electrode also serves as a reflector that is located at a predetermined portion to reflect light.
[34] That is, the reflective electrode is formed in the non-opening direction, such as the upper portion of the thin film transistor in the array portion to replace the role of the black matrix formed to prevent light leakage, as well as further configured in the array outer portion as in the present invention 4A and 4B, it acts as a black matrix formed to prevent light leakage at the outer edge of the array by pre-blocking light leaking between the linking lines of the outer edge of the array and at the edge surface of the second substrate. Instead.
[35] Therefore, the conventional reflective and semi-transmissive liquid crystal display devices were only able to remove the black matrix formed in the array portion to prevent light leakage, while the reflective and semi-transmissive liquid crystal display elements according to the present invention were formed on the outer edge of the array. Even the black matrix can be removed so that the entire black matrix can be removed.
[36] In addition, since the black matrix is not configured in the liquid crystal display, the backlight is reflected on the black matrix layer, thereby preventing the adverse effect of light leakage on the screen.
[37] The reflective and transflective liquid crystal display devices of the present invention as described above have the following effects.
[38] First, since the light leakage is prevented by the reflecting electrode reflecting light, which is formed to extend to the array portion as well as the outer portion of the array, reliability of the device is improved.
[39] Second, process cost is lowered because it does not form a black matrix that has been formed to prevent light leakage.

权利要求:
Claims (2)
[1" claim-type="Currently amended] In the array portion and the array outer portion,
First and second substrates;
A liquid crystal layer formed between the first and second substrates;
A gate line on the first substrate;
A gate insulating film formed on the entire surface including the gate line;
A data line formed on the gate insulating layer to be orthogonal to the gate line;
A protective film formed on the gate insulating film including the data line;
An insulating film formed on the protective film;
A reflective electrode formed on the insulating layer to extend to an outer edge of the array to prevent light leaking from the backlight;
Reflective and transflective liquid crystal display device comprising a color filter layer formed on the second substrate.
[2" claim-type="Currently amended] The reflective and semi-transmissive liquid crystal display device according to claim 1, wherein a black matrix is not formed around the array of the second substrate.

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同族专利:

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2000-10-17|Application filed by 구본준, 론 위라하디락사, 엘지.필립스 엘시디 주식회사

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2000-10-17|Priority to KR1020000061049A

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2002-04-25|Publication of KR20020030428A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020000061049A|KR20020030428A|2000-10-17|2000-10-17|Reflective and semi-transparent type liquid crystal display device|