• 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:
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving a liquid crystal display (LCD) using a graphic card. More particularly, the present invention relates to a gate driver and a source driver in a driving circuit of a liquid crystal display. The graphics card has a function of a timing controller for outputting control signals and image data used by a source driver, and the control signal of the liquid crystal display device, image data and The present invention relates to a method of driving a liquid crystal display device using a graphics card, which outputs a clock to the liquid crystal display device, the flow of which is referred to by the graphics controller of the graphics card outputting a digital image signal, Include the sync signal and clock in the recoded image data to output as a digital signal Outputting first step; An LCD time controller embedded in the graphics card receives the digital signal, and converts the digital signal into a clock, a control signal, and image data according to a resolution and timing of the liquid crystal display by a command of a controller embedded in the graphics card; Step 2; The gate driver and the source driver of the driving circuit of the liquid crystal display device receive the converted clock, the control signal and the image data, and the third step is used to represent the image using the clock, the control signal and the image data.
    公开号:KR19990059987A
    申请号:KR1019970080205
    申请日:1997-12-31
    公开日:1999-07-26
    发明作者:고성현
    申请人:윤종용；삼성전자 주식회사；
    IPC主号:
    专利说明:

    Driving Method of Liquid Crystal Display Using Graphic Card
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving a liquid crystal display (LCD) using a graphic card. More particularly, the present invention relates to a gate driver and a source driver in a driving circuit of a liquid crystal display. The graphics card has a function of a timing controller for outputting control signals and image data used by a source driver, and the control signal of the liquid crystal display device, image data and A driving method of a liquid crystal display device using a graphics card, which outputs a clock to the liquid crystal display device.
    The application range of thin film transistor liquid crystal display devices, which are emerging as the media of information media in the 21st century, is expanding day by day. In other words, the use of a notebook computer (notebook computer) in the past has been the main focus is expanding the scope of application for the current monitor.
    In the liquid crystal display, an analog interface method and a digital interface method are used. Of the two methods, the analog interface type liquid crystal display device is a predominant trend in that it can directly replace a conventional cathode ray tube (CRT) monitor, and the digital interface type liquid crystal display device is simple and has an impedance matching aspect. As it is advantageously used in most notebook computers, both methods currently coexist.
    Hereinafter, an operation of the graphic card and the conventional liquid crystal display will be described with reference to the drawings.
    1 is a block diagram of a liquid crystal display device operating in conjunction with a conventional graphics card, wherein the VGA card 10 includes a VGA chip 20 and a memory 12, and the VGA chip 20 includes a VGA controller 22. And RAMDAC (24). In addition, the LCD driving circuit 30 includes an LCD time controller 32, a gate driver 34, and a source driver 36.
    The driving principle of the liquid crystal display device for the monitor is that, in the VGA card 10, the VGA controller 22 of the VGA chip 20 outputs a digital signal including a synchronization signal and image data, and the output digital signal is a lambda 24. ) Is entered. The RAMDAC 24 is a RAM for encoding image data including a part of graphic data of the entire screen stored in a memory and a digital signal including a synchronization signal and a clock in the digital data coded in this manner. It is input to the liquid crystal display device for a monitor via the DAC which converts into a. Here, the analog signal input to the liquid crystal display device for the monitor is converted into a digital signal and input to the LCD time controller 32 of the LCD driving circuit 30.
    Next, the LCD time controller 32 of the LCD driving circuit 30 outputs clocks, control signals, and image data used by the gate driver 34 and the source driver 36 from the input digital signals.
    The driving principle of the liquid crystal display device for the notebook is that the digital interface is output from the VGA controller 22 of the VGA chip 20 from the VGA card 10, since only the digital interface is provided without the analog interface process. The digital signal including the synchronization signal and the clock in the recoded image data passing through the RAM is input to the LCD time controller 32 of the LCD driving circuit 30 in the state of the digital signal without passing through the home.
    Next, the LCD time controller 32 function of the LCD drive circuit 30 is driven in the same manner as the liquid crystal display device for the monitor.
    Here, in the VGA card 10, the VGA controller 22 of the VGA chip 20 and the LCD time controller 32 of the LCD driving circuit 30 receive a control signal and data for representing an image in the form of a digital signal. There is a similar function in that it prints.
    Therefore, the VGA controller having the similar function and the time controller of the LCD driving circuit are located in the graphics card and the liquid crystal display at the same time, so that there is a problem in terms of cost and compact appearance.
    Accordingly, an object of the present invention is to solve the problems of the prior art, by embedding the function of the LCD time controller in the drive circuit of the conventional liquid crystal display in the graphics card to reduce the redundant elements, the control unit of the graphics card is a liquid crystal display device The present invention provides a method of driving a liquid crystal display device using a graphics card, which adjusts an LCD time controller to match the resolution and timing of the controller, thereby outputting clocks, control signals, and image data.
    1 is a block diagram of a liquid crystal display device operating in conjunction with a conventional graphics card.
    2 is a block diagram of a liquid crystal display using a graphics card according to an embodiment of the present invention.
    3 is a flowchart of a method of driving a liquid crystal display using a graphics card according to an embodiment of the present invention.
    As a means for achieving the above object, the configuration of the present invention,
    A first step of the graphic controller of the graphics card outputting a digital image signal, including a synchronization signal and a clock in the recoded image data by referring to a memory built in the graphics card, and outputting the digital image signal;
    An LCD time controller embedded in the graphics card receives the digital signal, and converts the digital signal into a clock, a control signal, and image data according to a resolution and timing of the liquid crystal display by a command of a controller embedded in the graphics card; Step 2;
    The gate driver and the source driver of the driving circuit of the liquid crystal display device receive the converted clock, the control signal and the image data, and the third step is used to represent the image using the clock, the control signal and the image data.
    In addition, the clock, control signal, and image data output after the second step may be compressed-coded digital signals using low voltage differential signaling (LVDS) and transmission minimized differential signaling (TMDS) elements built in the graphics card. The digital signal transmitted to the liquid crystal display and the compression coded digital signal are input to the gate driver and the source driver through a process of decompressing the liquid crystal display.
    By the above configuration, the configuration and operation of the most preferred embodiment that can easily implement the present invention will be described in detail with reference to the accompanying drawings.
    2 is a block diagram of a liquid crystal display using a graphics card according to an embodiment of the present invention, which uses a VGA card 40 as a graphics card, and the liquid crystal display is a compact LCD driving circuit in which the LCD time controller is removed. (60).
    Accordingly, the VGA card 40 includes a VGA chip 50, a memory 42, and a control unit 44, and the VGA chip 50 includes a VGA controller 52, a RAMDAC 54, and an LCD time controller 56. It further includes, the controller 44 is composed of a microcomputer and a ROM. In addition, the LCD driving circuit 60 includes a gate driver 62 and a source driver 64.
    3 is a flowchart of a method of driving a liquid crystal display device using a graphics card according to an embodiment of the present invention. The embodiment of the present invention is applied to a liquid crystal display device for a notebook computer having a digital interface method.
    In the VGA card 40, the VGA controller 52 in the VGA chip 50 outputs a digital image signal (S100), and the output digital image signal is a synchronization signal to the image data recoded by the RAM in the RAM 54. And a clock is included and output as a digital signal (S102). The output digital signal is input to the LCD time controller 56 embedded in the VGA card 40, and the controller 44 of the VGA card 40 is a signal whose LCD time controller matches the resolution and timing of the liquid crystal display. The control signal, clock, and image data such as the vertical start signal STV, the horizontal start signal STH, and the load signal TP are outputted by adjusting the output power to be output (S104). The gate drive 62 and the source drive 64 in the LCD driving circuit use the control signals such as the output vertical start signal STV, the horizontal start signal STH, and the load signal TP, and the clock and image data. An image is displayed on the display device (S106).
    On the other hand, the clock, the control signal and the image data output by the LCD time controller 56 embedded in the VGA card 40 after the above process (S104) using the LVDS or TMDS element built into the VGA card 40 The compressed coded digital signal is transmitted to the liquid crystal display device, and the compressed coded digital signal is decompressed clock, control signal, and image data through the LVDS or TMDS device which is decompressed to the liquid crystal display device, thereby providing the gate driver 62. ) And the source driver 64.
    On the other hand, the driving method of the above embodiment can be changed without departing from the gist of the present invention.
    The present invention simplifies the liquid crystal display device by removing the time controller from the liquid crystal display device, and reduces the cost by placing the graphic controller and the time controller having a similar function on the same graphic card.
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] A first step of the graphic controller of the graphics card outputting a digital image signal, including a synchronization signal and a clock in the recoded image data by referring to a memory built in the graphics card, and outputting the digital image signal;
    An LCD time controller embedded in the graphics card receives the digital signal, and converts the digital signal into a clock, a control signal, and image data according to a resolution and timing of the liquid crystal display by a command of a controller embedded in the graphics card; Step 2;
    And a third step in which a gate driver and a source driver of the driving circuit of the liquid crystal display device receive the converted clock, control signal and image data, and express the image using the clock, control signal and image data. A driving method of a liquid crystal display device using a graphics card.
    [2" claim-type="Currently amended] The method of claim 1,
    The clock, the control signal and the image data output after the second step are
    The digital signal, which is compression-coded using the LVDS and TMDS elements embedded in the graphics card, is transmitted to the liquid crystal display, and the compression-coded digital signal is decompressed by the liquid crystal display and the gate driver A method of driving a liquid crystal display device using a graphics card, which is input to the source driver.
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    同族专利:
    公开号 | 公开日
    KR100521262B1|2005-12-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-12-31|Application filed by 윤종용, 삼성전자 주식회사
    1997-12-31|Priority to KR1019970080205A
    1999-07-26|Publication of KR19990059987A
    2005-12-21|Application granted
    2005-12-21|Publication of KR100521262B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970080205A|KR100521262B1|1997-12-31|1997-12-31|Driving Method of Liquid Crystal Display Using Graphic Card|
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