KR20020070911A - A preventing method of an echo phenomenon for a Liquid Crystal Display - Google Patents

A preventing method of an echo phenomenon for a Liquid Crystal Display Download PDF

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KR20020070911A
KR20020070911A KR1020020040737A KR20020040737A KR20020070911A KR 20020070911 A KR20020070911 A KR 20020070911A KR 1020020040737 A KR1020020040737 A KR 1020020040737A KR 20020040737 A KR20020040737 A KR 20020040737A KR 20020070911 A KR20020070911 A KR 20020070911A
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South Korea
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buffer memory
frame buffer
frame
liquid crystal
crystal display
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KR1020020040737A
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Korean (ko)
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KR100526704B1 (en
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유승명
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주식회사 디엠케이
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/12—Frame memory handling

Abstract

PURPOSE: A method for preventing screen dragging of an LCD is provided to improve the screen dragging when realizing the speedy motion pictures for achieving the motion picture screen characteristics of a CRT. CONSTITUTION: A method for preventing screen dragging of an LCD includes the steps of storing digital picture data by a frame unit to a first frame buffer memory(11) at a speed equal to a driving clock of an input interface at a timing controller(20), storing the picture data stored in the first frame buffer memory to a second frame buffer memory(12) at a double speed of the storing speed of the first frame buffer memory, outputting image signals stored in the second frame buffer memory for the half of the frame by providing the picture data to a source driving IC(31) of the liquid crystal display part(30), and storing the picture data stored in the first frame buffer memory to the second frame buffer memory while transmitting black data for the other half of the frame.

Description

액정 디스플레이 장치의 끌림 현상 방지 방법{A preventing method of an echo phenomenon for a Liquid Crystal Display }A preventing method of an echo phenomenon for a liquid crystal display}

본 발명은 액정 디스플레이 장치를 이용한 화상정보의 표시방법에 관한 것으로서, 보다 상세하게는 액정 디스플레이 장치에서 동화상 구현시 발생하는 끌림 현상을 방지하기 위한 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of displaying image information using a liquid crystal display device. More particularly, the present invention relates to a method for preventing drag caused when moving images are implemented in a liquid crystal display device.

일반적인 컴퓨터는 모니터(Monitor)를 대상으로 수평동기신호(HSYNC), 수직동기신호(VSYNC) 및 영상신호(R, G, B)를 출력한다. 모니터로는 음극선관(CathodeRay Tube: 이하 "CRT"라 함) 또는 액정디스플레이장치(Liquid Crystal Display: 이하 "LCD"라 함) 등이 있으며 입력된 수평동기신호 및 수직동기신호에 따라 영상신호를 표시한다.A general computer outputs a horizontal synchronizing signal HSYNC, a vertical synchronizing signal VSYNC, and an image signal R, G, and B to a monitor. Monitors include cathode ray tubes (CRTs) or liquid crystal displays (LCDs), and display video signals based on horizontal and vertical sync signals. do.

LCD는 픽셀(Pixel)들이 특정 전압으로 세팅되면 한 프레임(frame)동안 동일 전압을 유지하게 된다. 따라서 한 프레임 동안에는 동일한 휘도를 나타내게 된다. 이렇게 유지되는 휘도 때문에 빠르게 움직이는 동화상에서는 눈의 망막(網膜)의 작용에 의해 화상(畵像)이 끌리는 것처럼 느끼게 된다. 물론 액정의 응답속도도 이러한 끌림에 영향을 주지만 60Hz에 해당하는 주기인 16.7msec 이하로 응답속도가 낮아진다고 하더라도 프레임동안 지속되는 휘도 유지 방식에서는 끌림현상을 피할 수 없다.The LCD maintains the same voltage for one frame if the pixels are set to a specific voltage. Therefore, the same luminance is displayed during one frame. Due to the luminance maintained in this way, in a moving moving image, the image is attracted by the action of the retina of the eye. Of course, the response speed of the liquid crystal also affects the drag, but even if the response speed is lowered below 16.7 msec, which is equivalent to 60 Hz, the drag phenomenon cannot be avoided in the luminance sustaining method that is maintained during the frame.

반면에 CRT는 끌림현상이 없는데 이는 CRT에 의한 디스플레이의 발광 듀티(Duty)가 10% 수준으로 LCD와는 특성 측면에서 차이가 있기 때문이다.On the other hand, CRTs are not attracted because the emission duty of displays by CRTs is about 10%, which is different from LCD in terms of characteristics.

본 발명은 액정 디스플레이 장치의 동화상 구현시 발생하는 끌림현상을 방지 수 있는 방법을 제공하는 것을 목적으로 한다.An object of the present invention is to provide a method capable of preventing the attraction phenomenon occurs when the moving picture is implemented in the liquid crystal display device.

이러한 목적을 달성하기 위한 본 발명에 따른 액정 디스플레이 장치의 끌림현상 방지 방법은 타이밍 컨트롤러(timing controller)에서 입력 인터페이스(input interface)의 구동클럭(clock)과 동일한 속도로 프레임(frame) 단위의 디지털(digital)화상 데이터를 제1 프레임 버퍼메모리(a first frame buffermemory)에 저장(write)하는 단계와; 상기 타이밍 컨트롤러에서 제1 프레임 버퍼 메모리에 저장하는 속도의 두배 속도로 제1 프레임 버퍼메모리에 저장된 화상정보를 제2 프레임 버퍼메모리(a second frame buffer memory)로 옮겨 저장하고, 다시 액정 표시부의 소스 구동부(source driver IC)로 제공하여 프레임(frame)의 반(半) 동안 상기 제2 프레임 버퍼메모리에 저장된 영상신호를 출력하고, 나머지 반(半) 프레임 시간동안 블랙 데이터(black data)를 전송하면서 동시에 제1 프레임 버퍼메모리에 저장된 화상정보를 제2 프레임 버퍼메모리로 옮겨 저장하는 단계를 포함하여 이루어지는 것을 특징으로 한다.In order to achieve the above object, a method of preventing drag of a liquid crystal display device according to an embodiment of the present invention includes a digital frame-by-frame digital frame at the same speed as a driving clock of an input interface in a timing controller. digital) writing the image data to a first frame buffer memory; Image information stored in the first frame buffer memory is transferred to a second frame buffer memory at twice the speed of the timing controller stored in the first frame buffer memory, and then the source driver of the liquid crystal display unit. a video signal stored in the second frame buffer memory for half of a frame, and transmitting black data for the other half frame time. And transferring the image information stored in the first frame buffer memory to the second frame buffer memory.

도 1은 본 발명에 따른 끌림현상 방지방법을 구현하기 위한 발광듀티 조절회로의 구성을 나타내는 블럭도,1 is a block diagram showing the configuration of a light emission duty control circuit for implementing the drag phenomenon prevention method according to the present invention;

도 2는 본 발명에 따른 방법에 의해 시간의 변화에 따른 각 구성요소에서의 화상 데이터의 타이밍 관계도이다.2 is a timing relationship diagram of image data in each component with a change in time by the method according to the present invention.

이하, 첨부된 도면을 참조로 본 발명에 따른 끌림현상 방지방법에 대하여 설명하기로 한다.Hereinafter, the drag phenomenon prevention method according to the present invention with reference to the accompanying drawings will be described.

도 1은 본 발명에 따른 끌림현상 방지방법을 구현하기 위한 발광듀티 조절회로의 구성을 나타내는 블럭도이다. CRT와 같이 발광 듀티(Duty)를 구현해 줌으로써 액정 디스플레이 장치에서의 끌림현상을 제거할 수 있다. 이를 위해서는 액정의 응답속도가 8msec 수준으로 빨라져야 하며, LCD구동회로부는 2개의 프레임 버퍼 메모리(Frame Buffer Memory)를 구비해야 하고 타이밍 컨트롤러(Timing Controller)의 처리가 특수하게 변경되어야 한다.1 is a block diagram showing the configuration of a light emission duty control circuit for implementing the drag phenomenon prevention method according to the present invention. By implementing the light emission duty like CRT, the drag phenomenon in the liquid crystal display device can be eliminated. To this end, the response speed of the liquid crystal should be increased to 8msec level, the LCD driving circuit unit should have two frame buffer memories and the processing of the timing controller should be changed specially.

도 1에서와 같이 각각 한 프레임(frame) 단위의 정보를 저장할 수 있는 제1, 제2 프레임 버퍼 메모리(a first frame buffer memory, a second frame buffer memory)(11, 12)로 이루어진 프레임 메모리(10)가 종래 방식과 크게 차이나는 부분이다.As shown in FIG. 1, a frame memory 10 including a first frame buffer memory 11 and a second frame buffer memory 11 and 12 capable of storing information of one frame unit, respectively. ) Is a significant difference from the conventional method.

프레임 버퍼 메모리(frame buffer memory)(10)는 타이밍 컨트롤러(Timing Controller)(20)에서 검출한 프레임(Frame) 단위의 화상 디지털 데이터(Digital Data)를 저장하기 위한 것으로 라이팅(Writing)은 외부로부터 상기 타이밍 컨트롤러(20)에 전달되는 입력 인터페이싱 클럭(Input Interface clock)과 동일 속도로 이루어지게 된다. 이 메모리의 용량은 화상의 해상도와 신호의 색상 깊이(Color depth)에 의해 정해진다.The frame buffer memory 10 is for storing image digital data in units of frames detected by the timing controller 20. The writing is performed from the outside. At the same speed as the input interface clock transmitted to the timing controller 20. The capacity of this memory is determined by the resolution of the picture and the color depth of the signal.

각 프레임 버퍼 메모리는 모두 1화면 표시분의 표시데이타를 저장할 수 있는 메모리용량을 갖는다. 이들은 한쪽의 메모리가 표시데이타의 라이트제어를 실행하고 있는 기간동안에 다른쪽의 메모리는 리드제어를 실행한다.Each frame buffer memory has a memory capacity capable of storing display data for one screen display. They perform read control while the other memory executes the write control of the display data.

제2 프레임 버퍼메모리(12)는 제 1 프레임 버퍼메모리(11)에 저장된 화상정보를 옮겨와 다시 타이밍 컨트롤러(20)를 거쳐 Source 구동 드라이버(31)측에 보내지게 된다. 이 때의 전송속도는 입력 인터페이싱 클럭(input interface clock)의 두배(2fc)가 사용되어 입력 인터페이싱 타이밍상의 프레임(frame) 시간(일반적으로 16.7msec)의 반 동안(8msec)에 한 프레임(frame) 신호를 출력하고 후반부 반(半) 동안(약 8msec)에는 블랙데이터(black data)를 전송한다. 이러한 처리과정을 진행하는 동안 입력 인터페이스 장치를 통해 입력되는 화상정보는 제1 프레임 버퍼 메모리(11)에 저장된다.The second frame buffer memory 12 transfers the image information stored in the first frame buffer memory 11 and sends it back to the source driving driver 31 via the timing controller 20. In this case, the transmission speed is twice the input interface clock (2fc), so that one frame signal for half (8 msec) of the frame time (typically 16.7 msec) on the input interfacing timing is used. Outputs and transmits black data during the second half (about 8 msec). During this process, the image information input through the input interface device is stored in the first frame buffer memory 11.

도 2는 본 발명에 따른 방법에 의해 시간의 변화에 따른 각 구성요소에서의 화상 데이터의 타이밍 관계를 나타낸 것이다. (A)는 인터페이스 장치로부터 타이밍 컨트롤러에 제공되는 화상 데이터 정보를 프레임 단위로 나타낸 것이다. (B)는 동일한 기간(t)동안 제1 프레임 버퍼 메모리(11)에 저장되는 화상데이터를 나타낸 것이다. (C)는 타이밍 컨트롤러로부터 소스 구동부(31)와 게이트 구동부(32)로 출력되는 화상 데이터를 나타낸 것이다.Fig. 2 shows the timing relationship of image data in each component with the change of time by the method according to the present invention. (A) shows image data information provided from the interface device to the timing controller in units of frames. (B) shows image data stored in the first frame buffer memory 11 for the same period t. (C) shows image data output from the timing controller to the source driver 31 and the gate driver 32.

즉, 본래의 프레임 화상정보를 입력 프레임 시간(input frame time)의 절반 에 해당하는 시간동안 LCD에 뿌려 주고, 나머지 절반(折半)시간 동안에는 블랙데이터(black data)를 뿌려 준다. 즉, 화면구성 듀티(Duty)를 50%로 만들어 주는 것이다.That is, the original frame image information is sprinkled on the LCD for half of the input frame time, and black data is sprinkled for the other half of the time. That is, it makes the screen composition duty 50%.

타이밍 컨트롤러(20)가 블랙 데이터(black data)를 뿌려주는 기간동안에 제1 프레임 버퍼메모리(11)에 있던 화상 데이터를 제2 프레임 버퍼메모리(12)에 옮겨주게 되는데, 이때 리딩(reading)과 라이팅(writing)하며 이때, 사용하는 클럭(clock)도 입력 인터페이스 클럭(input interface clock)의 2배 속도를 사용해야 한다.During the period in which the timing controller 20 scatters black data, the image data in the first frame buffer memory 11 is transferred to the second frame buffer memory 12, where reading and writing are performed. In this case, the clock used must be twice the speed of the input interface clock.

타이밍 컨트롤러(20)는 Source 구동부(31)와 Gate 구동부(32)에 전송하는 제어신호(control signal)를 기존방식에 비하여 2배의 속도로 전달해 줄 수 있도록 내부 회로가 변경되어야 한다.The timing controller 20 needs to change an internal circuit so that a control signal transmitted to the source driver 31 and the gate driver 32 can be transmitted at twice the speed of the conventional method.

이상에서 설명한 바와 같이 프레임 메모리(10)를 제어하기 위해서는 입력 인터페이싱 클럭(input interface clock)의 2배속도를 갖도록 만들어져야 하며, 출력단에서 블랙 데이터(black data)를 갖는 프레임을 처리하기 위한 로직(logic)이 추가되어야 할 것이다.As described above, in order to control the frame memory 10, the frame memory 10 should be made to have a double speed of an input interface clock, and logic for processing a frame having black data at an output terminal. Will need to be added.

위와 같은 방법을 사용하게 되면 소스 드라이버(31)용 칩의 처리속도가 두배가 되어야 하는 부담이 발생하게 되지만 2분주 구동 방식 등을 통해 해결하는데 별 어려움이 없다. 그리고 실제 데이터가 박막트랜지스터 액정 디스플레이 셀(TFT LCD Cell)에 충전되는데 소요되는 시간이 결국 반으로 줄게 되므로 실현을 위해서 필요한 요건은 박막트랜지스터 스위칭소자(TFT Switching)소자로 다결정 실리콘(Poly-Si) 계통이 사용되어야 할 것이다. 이 또한 다결정 실리콘(Poly-Si)이 대화면 액정 디스플레이 장치등에 적용되고 있는 추세이기 때문에 충분히 가능하다. 그리고 이러한 다결정 실리콘(Poly-Si)이 사용되는 소형 액정 디스플레이 제품군에는 바로 적용이 가능할 수 있다.If the above method is used, the burden that the processing speed of the chip for the source driver 31 needs to be doubled occurs, but there is no difficulty in solving the problem through a two-division driving method. In addition, since the time required for the actual data to be charged into the TFT LCD Cell is reduced in half, the necessary requirement for the realization is a thin film transistor switching device, which is a poly-silicon system. This should be used. This is also possible because poly-silicon (Poly-Si) is being applied to large screen liquid crystal display devices and the like. In addition, the present invention may be immediately applied to a small family of liquid crystal displays using poly-Si.

본 발명은 기존의 한 프레임동안 동일 휘도가 지속적으로 유지되던 액정 디스플레이 장치가 안고 있던 빠른 동화상 구현시의 끌림현상을 개선함으로서 CRT와 동등한 동화면 특성을 갖도록 하는 것임.The present invention is to improve the drag phenomenon in the fast moving picture implementation that the liquid crystal display device that the same brightness is continuously maintained for one frame to have the same picture characteristics as the CRT.

Claims (1)

동화상 구현시 액정 디스플레이 장치에서 나타나는 끌림현상을 방지하기 위한 방법에 있어서:In a method for preventing a drag phenomenon in a liquid crystal display device when a moving image is implemented: 타이밍 컨트롤러(timing controller)에서 입력 인터페이스(input interface)의 구동클럭(clock)과 동일한 속도로 프레임(frame) 단위의 디지털(digital)화상 데이터를 제1 프레임 버퍼메모리(a first frame buffer memory)에 저장(write)하는 단계와;The digital controller stores frame-by-frame digital image data in a first frame buffer memory at the same speed as a driving clock of an input interface in a timing controller. writing; 상기 타이밍 컨트롤러에서 제1 프레임 버퍼 메모리에 저장하는 속도의 두배 속도로 제1 프레임 버퍼메모리에 저장된 화상정보를 제2 프레임 버퍼메모리(a second frame buffer memory)로 옮겨 저장하고, 다시 액정 표시부의 소스 구동부(source driver IC)로 제공하여 프레임(frame)의 반(半) 동안 상기 제2 프레임 버퍼메모리에 저장된 영상신호를 출력하고, 나머지 반(半) 프레임 시간동안 블랙 데이터(black data)를 전송하면서 동시에 제1 프레임 버퍼메모리에 저장된 화상정보를 제2 프레임 버퍼메모리로 옮겨 저장하는 단계를 포함하여 이루어지는 것을 특징으로 하는 액정 디스플레이 장치의 끌림 현상 방지 방법.Image information stored in the first frame buffer memory is transferred to a second frame buffer memory at twice the speed of the timing controller stored in the first frame buffer memory, and then the source driver of the liquid crystal display unit. a video signal stored in the second frame buffer memory for half of a frame, and transmitting black data for the other half frame time. And transferring the image information stored in the first frame buffer memory to the second frame buffer memory.
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