• 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:
    The disclosed self-contained circuits and methods relate to circuits and methods for implementing the self-raster functionality by making the pedestal level of the video signal higher than normal. A self-limiting circuit and method according to a pedestal level control according to the present invention is a display device for displaying an image supply apparatus and image information inputted thereinto, wherein a connection of a signal cable connecting the image supply apparatus and the display apparatus A circuit employing a method of raising the pedestal level of the video signal when the video signal is interrupted is provided so that the self-raster function is implemented. Therefore, the circuit and method of the present invention not only can realize the self-raster function using only the digital signal level, but also reduce the number of parts and unnecessary patterns on the PCB, thereby making the display device more stable operation.
    公开号:KR19990015126A
    申请号:KR1019970037031
    申请日:1997-08-01
    公开日:1999-03-05
    发明作者:최용훈
    申请人:윤종용；삼성전자 주식회사；
    IPC主号:
    专利说明:

    Self-limiting circuit and method by pedestal level control
    The present invention relates to a display device for displaying a video signal input from a video supply device, and a circuit employing a method of raising a pedestal level, which is a reference of a video signal, And a self-restraining circuit and method by pedestal level control for realizing a self-raster (Self Raster) function.
    2. Description of the Related Art Generally, a video supply device and a display device, such as a computer main body and a cathode-ray tube display device, are interconnected by a signal cable, and through the signal cable, And a control signal.
    Therefore, if the connection is broken due to the missing signal cable between the video supply device and the display device, the user should be warned to recognize the fact and reconnected.
    The self-raster circuit is a circuit for warning the user by displaying the signal cable connecting the image supply device and the display device (self-raster mode) on the screen of the display device. 1 < / RTI > grid (hereinafter referred to as " G1 ").
    That is, in the self-raster mode of the cathode ray tube display apparatus, the voltage supplied to the control grid G1, which controls the brightness of the screen, is increased by controlling the amount of electrons emitted from the cathode of the cathode ray tube, I did it.
    1 is a circuit diagram showing an example of such a conventional self-raster circuit, which is an example applied to a computer main body and a cathode-ray tube display device.
    As shown in the figure, the configuration is largely composed of a signal cable 100 for connecting the computer body and the cathode-ray tube display device to each other through a connector including the self-raster pins 101 and 102, A G1 voltage control unit 110 for controlling the voltage of G1 of the display device and a microcomputer 120 for supplying a signal for operating the cathode ray tube display device in the self-raster mode according to the mode.
    Here, the G1 voltage controller 110 receives an input signal (0 [V] or +5 [V]) according to the connection state of the signal cable 100, an input signal of +5 [V ) And an input signal (-210 [V]) of a high voltage level from a high voltage generating unit of a cathode ray tube display device not shown and output the adjusted voltage to G1, and a plurality of transistors, . + Vcc and + Vdd of +5 [V] are supplied as the driving power source.
    The operation of a conventional self-raster circuit with these components is as follows.
    First, when the signal cable 100 is connected between the cathode ray tube display device and the computer main body, the + Vdd power source is connected to the self raster pin 102 of the computer main body through the resistor R11 to be grounded. Therefore, the diode D11 and the transistor Q1 can not conduct.
    And the transistors Q3 and Q2 are turned on in turn by the voltage of +5 [V] supplied to the base terminal of the transistor Q3. Therefore, the potential of the emitter terminal of the transistor Q2 is maintained at about +0.6 [V], and the voltage difference of +0.6 [V] and -210 [V] is supplied to the G1 of the cathode ray tube by the resistors R15 and R17 .
    However, when the computer main body and the cathode ray tube display device are not connected to each other through the self-raster pins 101 and 102 as in the self-raster mode, + Vdd power is applied to the anode terminal of the diode D11 through the resistor R11, And the transistor Q1 is also turned on in accordance with conduction between the transistors Q3 and Q2.
    Therefore, the potential of the emitter terminal of the transistor Q2 and the base terminal of the transistor Q1 connected thereto becomes about +0.6 [V]. The reason why the potential is maintained is that the transistor Q3 is conductive, and therefore the potential of the collector terminal of the transistor Q3 and the base terminal of the transistor Q2 connected thereto is close to the ground potential.
    When the cathode ray tube display device is in the self-raster mode, a voltage difference of +0.6 [V] and -210 [V] which is the potential of the connection point between the base terminal of the transistor Q1 and the emitter terminal of the transistor Q2 is parallel to the resistors R15 and R16 Is distributed by a resistive resistor R17 and supplied to G1 of the cathode ray tube.
    Here, the parallel combined resistance value of the resistors R15 and R16 is The voltage applied to G1 of the cathode ray tube as a result of the voltage distribution is increased to be higher than that at the normal time. As a result, the screen of the cathode ray tube display device is brightened and the self- The raster function is implemented.
    In the conventional self-raster circuit having the above-described structure and operation, when the connection is broken due to the signal cable between the cathode ray tube display device and the computer main body being disconnected or the like, By raising the level to brighten the entire screen, the user has been made aware that the signal cable is disconnected.
    However, in order to control the G1 voltage, the high voltage (-210 [V]) must be controlled, while the input signal for control and the power supply to the G1 voltage controller 110 and the microcomputer 120 are low voltage (+ 5 [V]), the high voltage and the low voltage are directly connected to each other in a circuit, so that the operation of the circuit becomes unstable and the number of components for controlling the G1 voltage including the transistor is increased.
    In addition, in order to stabilize the circuit operation, a low voltage circuit such as a microcomputer and a circuit for generating a high voltage are located apart from each other on a printed circuit board (PCB). In order to interconnect them, a circuit pattern naturally becomes longer, Noise) is also present.
    It is therefore an object of the present invention to provide a circuit for realizing a method of raising a pedestal level of a video signal output from a video preamplifier when a connection of a signal cable connecting between a video supply device and a display device is broken, And a self-rastering circuit and method by pedestal level control capable of implementing a self-raster function driven only by a signal level.
    1 is a circuit diagram showing an example of a conventional self-raster circuit,
    2 is a block diagram showing an embodiment of a self-limiting circuit by pedestal level control to which the present invention is applied.
    3 is a detailed circuit diagram showing an example of Fig.
    Description of the Related Art [0002]
    200: Microcomputer 210: DC voltage conversion unit
    220: Self-raster recognizing unit 230: Pedestal level increasing unit
    240: Video Preamplifier
    According to an aspect of the present invention, there is provided a display device for displaying a video signal input from a video supply device of a self-leveling circuit and method by pedestal level control, Thereby realizing a self-raster function driven only by a digital signal level.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a self-limiting circuit and method according to a pedestal level control according to the present invention will be described in detail with reference to the accompanying drawings.
    2 is a block diagram showing an embodiment of a self-limiting circuit according to a pedestal level control according to the present invention, in which each component operates with a power source of +5 [V] which is a digital signal level.
    As shown in the figure, the self-raster mode recognition unit 220 in the self-limiting circuit according to the pedestal level control outputs voltages having different values depending on whether or not the signal cable connecting the image supply device and the display device is connected.
    The microcomputer 200 outputs a pulse-width-modulated waveform for adjusting a pedestal level of a video signal input from an image supply device according to an externally inputted brightness adjustment signal, while a self-raster mode And receives a signal input from the recognition unit 220 to switch the display device to the self-raster mode.
    The DC voltage converting unit 210 converts the pulse width modulation waveform output from the microcomputer 200 into a DC voltage of a predetermined range and outputs the DC voltage to the DC voltage converting unit 210. The pedestal level increasing unit 230 outputs the DC voltage to the self- And supplies the output signal of the mode recognition unit 220 to the video preamplifier unit 240 by raising the level of the voltage output from the DC voltage conversion unit 210. [
    The video preamplifier 240 amplifies the video signal input from the external device. The video preamplifier 240 receives the output signal of the pedestal level increasing unit 230 and outputs the pedestal level of the video signal, which is a direct- .
    3 is a detailed circuit diagram showing one embodiment of a self-limiting circuit by pedestal level control applied to a computer main body and a cathode-ray tube display device, as an example of a circuit diagram implementing FIG.
    As shown in the figure, the self-raster mode recognizing unit 320 includes a computer main body and a cathode-ray tube display device connected to a connector including self-raster pins 322 and 323 The self raster pin 322 on the cathode ray tube display device side of the signal cable 321 for connecting through the signal cable 321 is connected to + Vcc which is a power source of +5 [V] through one input terminal of the microcomputer 300 and a resistor R35, The self raster pin 323 on the main body side is grounded.
    The microcomputer 300 receives the output voltage of the self-raster mode recognition unit 320 through one input terminal and adjusts the pedestal level according to a brightness adjustment signal input from the outside via one of the output terminals And outputs the pulse-width-modulated waveform to the DC voltage converting unit 310.
    The DC voltage converting unit 310 transforms the pulse width modulated waveform input from the microcomputer 300 into a DC voltage having a maximum value and a minimum value determined by a plurality of resistors and an electrolytic capacitor serving as a charging means, Level increasing unit 330 as shown in FIG.
    On the other hand, the pedestal level increasing unit 330 receives the output signal of the self-raster recognizing unit 320 in the self-raster mode and raises the level of the voltage output from the DC voltage converting unit 310, And outputs it as negative.
    The operation of the self-limiting circuit by the pedestal level control thus constructed is as follows.
    First, when the signal cable 321 between the cathode ray tube display device and the computer main body is mutually connected, the self-raster pin 322 on the cathode ray tube display device side is grounded so that the output voltage of the self- Maintains the potential.
    At this time, when an input signal for brightness adjustment from the outside is applied to the microcomputer 300 by a user's key operation or the like, a transistor (NPN TR or FET) built in the microcomputer 300 as one output terminal of the microcomputer 300, And outputs a pulse width modulated waveform having a duty ratio corresponding to the input signal according to the brightness adjustment through one output terminal of the microcomputer 300. [
    Here, in the case of the transistor NPN TR incorporated in the microcomputer 300, an open-collector circuit which will be described in this embodiment, an open-drain circuit in the case of an FET and an open- Regardless of the type of the resistor R31 and the resistor R33, which is constituted by a push-pull circuit and is supplied with power by + Vcc (+5 [V]) distributed by the resistors R31 and R33.
    The pulse width modulated waveform output from the microcomputer 300 is charged to the electrolytic capacitor C31 of the DC voltage converting unit 310. When the user brightens the screen, the duty ratio of the pulse width modulated waveform becomes large, When the voltage is lowered and the screen is darkened, the duty ratio of the pulse width modulation waveform becomes small, and the electrolytic capacitor C31 is charged with a low voltage.
    However, the electrolytic capacitor C31 can not be charged by the resistors R31 and R33, and the voltage of + Vcc applied to both ends of the resistor R33 can not be charged.
    Here, the minimum value of the voltage level for determining the screen brightness of the display device is determined by the resistor R32. Since the collector terminal is grounded when the transistor inside the microcomputer 300 is turned on, As a result of grounding, the minimum voltage value of the brightness determination is .
    When the transistor inside the microcomputer 300 is not turned on, the resistor R32 is not grounded, so that the output voltage of the DC voltage converting unit 310 becomes maximum .
    That is, the pedestal level of the video signal output from the video pre-amplifier is determined by the resistances of the DC voltage converter 310 to the maximum and minimum values, and is applied to the input terminal of the video preamplifier. When the signal cables 321 are connected to each other, the range of the value is set to a minimum value according to the size of the brightness adjustment input signal from the outside Up to Lt; / RTI >
    However, in the case of the self-raster mode in which the computer body and the cathode-ray tube display device are not connected to each other through the self-raster pins 322 and 323, such as when the signal cable 321 is missing from the cathode- The self raster pin 322 on the display device side is disconnected from the self raster pin 323 on the computer main body side and the output voltage of the self-raster mode recognizing portion 320 is maintained at + Vcc through the resistor R35, A voltage is applied to one input terminal of the microcomputer 300.
    In this case, the microcomputer 300 not only switches the cathode ray tube display device to the self-raster mode, but also generates a pulse having a maximum duty ratio through a terminal for outputting a pulse width modulation waveform irrespective of an external brightness adjustment input signal Width modulation waveform.
    At this time, the resistor R34 of the pedestal level increasing portion 330 is connected in series with R35, and the resistor R34 + R35 is connected in parallel with the resistor R31 so that the voltage charged in the electrolytic capacitor C31 is Which is the maximum charge voltage of the steady state .
    As a result, the charging voltage is input to the brightness control terminal of the video preamplifier unit, and the pedestal level of the video signal output from the video preamplifier unit is maximized to brighten the entire screen, And warns that the signal cable 321 of the display device is disconnected.
    As described above, according to the self-limiting circuit and method of controlling the pedestal level according to the present invention, when the connection of the signal cable connecting the video supply device and the display device is disconnected, By providing a circuit employing a method of increasing the level of hair, it is possible not only to realize a self-raster function using only a digital signal level, but also to reduce the number of parts and unnecessary patterns on the PCB, thereby stabilizing the operation of the display device.
    权利要求:
    Claims (4)
    [1" claim-type="Currently amended] A first process for increasing a pedestal level when a signal cable connected between the image supply device and the display device is separated; And
    And a second step of performing a self-raster function at an increased pedestal level in the first step. The self-rastering method according to claim 1,
    [2" claim-type="Currently amended] A self-raster mode recognition unit for outputting voltages having different values depending on whether a signal cable connecting the video supply device and the display device is connected;
    In the normal raster mode, a signal input from the self-raster mode recognition unit is outputted to the main body of the computer in accordance with the external adjustment signal. A microcomputer which not only switches the display device to the self-raster mode but also outputs a pulse-width-modulated waveform having the maximum duty ratio;
    A DC voltage converting unit for converting a pulse width modulation waveform output from the microcomputer into a DC voltage of a predetermined range and outputting the DC voltage;
    A pedestal level increasing unit which receives an output of the self-raster mode recognizing unit and outputs an output voltage level of the direct current voltage converting unit in a self-raster mode;
    And a video preamplifier for outputting a pedestal level of a video signal having a predetermined value as a direct current signal according to an output signal of the pedestal level increasing unit.
    [3" claim-type="Currently amended] The plasma display apparatus of claim 2, wherein the DC voltage converting unit comprises:
    And a plurality of resistors and charging means.
    [4" claim-type="Currently amended] 3. The apparatus of claim 2, wherein the pedestal level increasing portion comprises:
    And a resistor connected between the power supply and the ground.
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    同族专利:
    公开号 | 公开日
    KR100237852B1|2000-01-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-08-01|Application filed by 윤종용, 삼성전자 주식회사
    1997-08-01|Priority to KR1019970037031A
    1999-03-05|Publication of KR19990015126A
    2000-01-15|Application granted
    2000-01-15|Publication of KR100237852B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970037031A|KR100237852B1|1997-08-01|1997-08-01|Self-rasting circuit by controlling the pedestal level and method thereof|
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