KR20030058517A - Tft-lcd - Google Patents
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- KR20030058517A KR20030058517A KR1020010088973A KR20010088973A KR20030058517A KR 20030058517 A KR20030058517 A KR 20030058517A KR 1020010088973 A KR1020010088973 A KR 1020010088973A KR 20010088973 A KR20010088973 A KR 20010088973A KR 20030058517 A KR20030058517 A KR 20030058517A
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- lcd
- backlight
- vertical blank
- tft
- blank signal
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 10
- 239000010409 thin film Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 101000885321 Homo sapiens Serine/threonine-protein kinase DCLK1 Proteins 0.000 description 1
- 102100039758 Serine/threonine-protein kinase DCLK1 Human genes 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
Classifications
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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
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- 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
- G09G3/3685—Details of drivers for data electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
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- 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
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Computer Hardware Design (AREA)
- Crystallography & Structural Chemistry (AREA)
- Nonlinear Science (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Ceramic Engineering (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Description
본 발명은 박막트랜지스터 액정표시장치(TFT-LCD)에 관한 것으로, 특히 프레임(Frame)과 프레임 사이의 수직 블랭킹(Blanking) 시간동안 백라이트(Backlight)를 오프(Off)시킴으로써, LCD 동영상에서 브러링(Blurring) 효과를 억제하여 보다 선명한 화질을 얻을 수 있는 TFT-LCD에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film transistor liquid crystal display (TFT-LCD), and in particular, by turning off the backlight during the vertical blanking time between the frame and the frame, The present invention relates to a TFT-LCD capable of obtaining a clearer picture quality by suppressing a blurring effect.
도 1은 종래의 일반적인 TFT-LCD의 구동 회로를 도시한 것이다. 도 1을 참조하면, 전원전압(VDD)을 입력하여 게이트구동용 전원전압(VG+, VG-)을 발생하는 DC-DC 변환기(10)와, 외부로부터 RGB 데이터(RGBin)와 제어신호(DE, DCLK, Hsync, Vsync 등)를 입력하여 게이트 드라이버(30)와 데이터 드라이버(40)에 액정패널 구동신호를 발생하는 타이밍 콘트롤러(20)와, 각각 게이트 구동신호와 데이터구동신호를 발생하여 액정패널(50)을 구동시켜 주는 게이트 드라이버(30) 및 데이터 드라이버(40) 그리고 타이밍 콘트롤러(20)로부터 극성신호(POL)를 입력하여 액정패널(50)에 공통전압(Vcom)을 발생하는 기준전압 및 공통전압 발생회로(60)를 구비한다.1 shows a driving circuit of a conventional general TFT-LCD. Referring to FIG. 1, a DC-DC converter 10 which inputs a power supply voltage VDD to generate gate driving power supply voltages VG + and VG-, and RGB data RGBin and a control signal DE, DCLK, Hsync, Vsync, etc.) to input the liquid crystal panel driving signal to the gate driver 30 and the data driver 40, and a timing controller 20 to generate the gate driving signal and the data driving signal, respectively. A reference voltage and a common voltage for generating the common voltage Vcom to the liquid crystal panel 50 by inputting the polarity signal POL from the gate driver 30, the data driver 40, and the timing controller 20 driving the 50. A voltage generator circuit 60 is provided.
도 2는 종래 기술에 따른 CRT의 광변화를 나타낸 그래프도이고, 도 3은 종래 기술에 따른 LCD의 광변화를 나타낸 그래프도이다.2 is a graph showing a light change of the CRT according to the prior art, Figure 3 is a graph showing a light change of the LCD according to the prior art.
그러나, 종래의 TFT-LCD의 구동 방법에 있어서는, 응답속도가 프레임(Frame)의 변환 속도보다 느리기 때문에 동화면 표시에서 화면의 윤곽이 흐리게 보이는 브러링(blurring) 효과가 발생된다. 특히, 계조간 응답속도가 느려 그레이(Gray) 화면에서 응답특성이 나쁘며, 이는 동화면의 화질을 떨어뜨리는 주요 원인이 되었다.However, in the conventional TFT-LCD driving method, since the response speed is slower than the conversion speed of the frame, a blurring effect of blurring the outline of the screen is generated in the moving picture display. In particular, the response speed between grays is low, so the response characteristics of the gray screen are poor, which is a major cause of deterioration of the picture quality.
이러한 문제는 오버드라이빙(Overdriving) 등의 방법으로 계조간 응답속도를 상당부분 개선할 수 있다. 그러나, 근본적으로 백라이트(Backlight)가 계속 온(On) 상태로 되어 있으므로, 도 2에 도시된 바와 같이 CRT 등의 발광형 디스플레이와의 근본적인 차이점인 프레임간 광연속성으로 인하여 브러링(Blurring) 현상은 계속 존재하게 된다.This problem can be significantly improved the response speed between the gray scales, such as by overdriving. However, since the backlight is constantly on, the blurring phenomenon is caused by the inter-frame optical continuity, which is a fundamental difference from the light emitting display such as CRT as shown in FIG. 2. It will continue to exist.
따라서, 본 발명은 상기 문제점을 해결하기 위하여 이루어진 것으로, 본 발명의 목적은 프레임(Frame)과 프레임 사이의 수직 블랭킹(Blanking) 시간동안 백라이트(Backlight)를 오프(Off)시킴으로써, LCD 동영상에서 브러링(Blurring) 효과를 억제하여 보다 선명한 화질을 얻을 수 있는 TFT-LCD를 제공하는데 있다.Accordingly, an object of the present invention is to solve the above problem, and an object of the present invention is to turn off a backlight during a vertical blanking time between a frame and a brush in the LCD video. It is to provide a TFT-LCD which can obtain a clearer picture quality by suppressing the (Blurring) effect.
또한, 본 발명의 다른 목적은 LCD의 동화면을 CRT처럼 프레임간에 광이 불연속적이 되도록 하므로써 동화면을 구현할 때 나타나는 브러링(Blurring) 현상을 제거시킨 TFT-LCD를 제공하는데 있다.In addition, another object of the present invention is to provide a TFT-LCD that eliminates the blurring phenomenon that occurs when the copper screen is implemented by making the copper screen of the LCD discontinuous between frames like the CRT.
또한, 본 발명의 또다른 목적은 백라이트(Backlight)를 LED 어레이 타입(type)으로 구현하므로써, 백라이트의 온(On)/오프(Off) 시간을 빠르게 한 TFT-LCD를 제공하는데 있다.In addition, another object of the present invention is to provide a TFT-LCD having a backlight on / off time by implementing the backlight (LED) as a type of LED array (type).
도 1은 종래의 일반적인 TFT-LCD의 구동 회로를 나타낸 구성도1 is a configuration diagram showing a driving circuit of a conventional general TFT-LCD
도 2는 종래 기술에 따른 CRT의 광변화를 나타낸 그래프도Figure 2 is a graph showing the light change of the CRT according to the prior art
도 3은 종래 기술에 따른 LCD의 광변화를 나타낸 그래프도Figure 3 is a graph showing the light change of the LCD according to the prior art
도 4는 본 발명에 의한 LCD의 광변화를 나타낸 그래프도Figure 4 is a graph showing the light change of the LCD according to the present invention
(도면의 주요 부분에 대한 부호의 설명)(Explanation of symbols for the main parts of the drawing)
70 : 컨트롤러부80 : 메모리부70: controller portion 80: memory portion
120 : 타이밍 컨트롤러부130 : 게이트 드라이브부120: timing controller unit 130: gate drive unit
140 : 데이타 드라이브부150 : 액정 패널140: data drive unit 150: liquid crystal panel
상기 목적을 달성하기 위하여, 본 발명에 의한 TFT-LCD는,In order to achieve the above object, the TFT-LCD according to the present invention,
LCD에 입력되는 수직 블랭크 신호를 백라이트 제어 신호로 사용하며, 백라이트에 들어갈 전류를 제어하는 제어신호를 상기 수직 블랭크 신호를 이용하여 생성하므로써, 상기 수직 블랭크 신호에 동기되어 백라이트가 일정시간동안 오프되는 것을 특징으로 한다.By using the vertical blank signal input to the LCD as a backlight control signal, and generating a control signal for controlling the current to enter the backlight using the vertical blank signal, the backlight is turned off for a predetermined time in synchronization with the vertical blank signal. It features.
상기 백라이트의 광원이 다이오드 어레이로 구성된 것을 특징으로 한다.The light source of the backlight is characterized by consisting of a diode array.
상기 백라이트의 광원이 유기 EL로 구성된 것을 특징으로 한다.The light source of the backlight is made of organic EL.
이하 첨부한 도면에 의거하여 본 발명의 바람직한 실시예를 자세히 설명하도록 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
먼저, 본 발명은 근본적으로 LCD의 동화면을 CRT처럼 프레임간에 광이 불연속적이 되도록 함으로써, 동화면을 구현할 때 나타나는 브러링(Blurring) 현상을 없애는 것을 목적으로 한다.First of all, an object of the present invention is to eliminate the blurring phenomenon that occurs when implementing a copper screen by essentially making the copper screen of the LCD discontinuous between frames like a CRT.
상술하면, 수직 블랭킹(Blanking) 기간 동안 백라이트(Backlight) 빛을 내보내지 않으므로써 각 프레임간 광이 불연속적으로 변하게 되어 CRT를 보는 듯한 효과가 생기게 된다.In detail, by not emitting backlight light during the vertical blanking period, the inter-frame light changes discontinuously, resulting in the effect of viewing the CRT.
보통 1 프레임(Frame) 주기가 16.7ms(60Hz의 경우)이고, 1∼2 ms의 수직 블랭킹 기간(즉, 프레임과 프레임 사이에 구분짓는 구간)이 있게 되는데, 이 수직 블랭킹 기간은 수직 블랭크 신호(Vertical Blank Signal)에 의해 제어된다. 이 수직 블랭크 신호와 백라이트 파워 라인을 접목하여 수직 블랭크 신호와 동기시켜 백라이트를 온(On)/오프(Off)시킴으로써, 수직 블랭킹(Blanking) 기간 동안 백라이트(Backlight) 빛을 내보내지 않게 된다.Typically, one frame period is 16.7 ms (at 60 Hz) and there is a vertical blanking period of 1 to 2 ms (i.e., the division period between the frames), which is a vertical blank signal ( Vertical Blank Signal). By combining the vertical blank signal and the backlight power line, the backlight is turned on / off in synchronization with the vertical blank signal so that the backlight light is not emitted during the vertical blanking period.
한편, 백라이트가 자주 온(On)/오프(Off)되어야 하므로, 기존의 형광등 방식은 수명과 반응 시간이 문제가 될 수 있다. 이에 발광 다이오드 어레이(Diode Array)로써 형광등을 대체할 수 있다.On the other hand, since the backlight should be frequently turned on (On) / off (Off), the conventional fluorescent lamp method may be a problem of life and reaction time. Accordingly, a fluorescent lamp may be replaced with a light emitting diode array.
도 4는 본 발명에 의한 LCD의 광변화를 나타낸 그래프도이다.Figure 4 is a graph showing the light change of the LCD according to the present invention.
도 4와 같은 광변화를 가져오기 위해 LCD의 제어 신호중 수직 블랭크 신호를 이용한다. 즉, LCD에 입력되는 수직 블랭크 신호(Vsync)를 백라이트 제어 신호로 사용하며, 백라이트에 들어갈 전류를 제어하는 제어신호를 수직 블랭크 신호(Vsync)를 이용하여 생성한다.The vertical blank signal of the control signals of the LCD is used to bring the light change as shown in FIG. 4. That is, the vertical blank signal Vsync input to the LCD is used as the backlight control signal, and a control signal for controlling the current to enter the backlight is generated using the vertical blank signal Vsync.
백라이트가 오프(Off)되는 시간은 반드시 수직 블랭크 기간과 같아야 하는 것은 아니며, 이보다 더 길게 또는 짧게 할 수 있다.The time that the backlight is off does not necessarily have to be equal to the vertical blank period, but may be longer or shorter than this.
이상에서 자세히 설명된 바와 같이, 본 발명에 의한 박막트랜지스터 액정표시장치(TFT-LCD)는, 프레임(Frame)과 프레임 사이의 수직 블랭킹(Blanking) 시간동안 백라이트(Backlight)를 오프(Off)시킴으로써, LCD 동영상에서 브러링(Blurring) 효과를 억제하여 보다 선명한 화질을 얻을 수 있다.As described in detail above, the thin film transistor liquid crystal display (TFT-LCD) according to the present invention, by turning off the backlight during the vertical blanking (Frame) time between the frame (Frame), By suppressing the blurring effect in the LCD video, a clearer picture quality can be obtained.
또한, LCD의 동화면을 CRT처럼 프레임간에 광이 불연속적이 되도록 하므로써 동화면을 구현할 때 나타나는 브러링(Blurring) 현상을 제거시킬 수 있다.In addition, by making the copper screen of the LCD discontinuous between frames like the CRT, the blurring phenomenon that occurs when the copper screen is implemented can be eliminated.
또한, 백라이트(Backlight)를 LED 어레이 타입(type)으로 구현하므로써, 백라이트의 온(On)/오프(Off) 시간을 빠르게 할 수 있다.In addition, by implementing the backlight as an LED array type, it is possible to speed up the on / off time of the backlight.
아울러 본 발명의 바람직한 실시예들은 예시의 목적을 위해 개시된 것이며, 당업자라면 본 발명의 사상과 범위 안에서 다양한 수정, 변경, 부가등이 가능할 것이며, 이러한 수정 변경등은 이하의 특허청구범위에 속하는 것으로 보아야 할 것이다.In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to various modifications, changes, additions, etc. within the spirit and scope of the present invention, these modifications and changes should be seen as belonging to the following claims. something to do.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006118382A2 (en) * | 2005-05-04 | 2006-11-09 | Daewoo Electronics Corporation | Driving apparatus of liquid crystal display having organic electroluminescence backlight |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11202286A (en) * | 1998-01-09 | 1999-07-30 | Toshiba Corp | Liquid crystal display device |
| KR20000062993A (en) * | 1999-03-23 | 2000-10-25 | 가나이 쓰토무 | Liquid crystal display apparatus |
| KR20010050411A (en) * | 1999-11-08 | 2001-06-15 | 아끼구사 나오유끼 | Liquid crystal display |
| KR20010113017A (en) * | 2000-06-15 | 2001-12-24 | 마찌다 가쯔히꼬 | Liquid crystal display device, image display device, illumination device and emitter used therefor, driving method of liquid crystal display device, driving method of illumination device, and driving method of emitter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11202286A (en) * | 1998-01-09 | 1999-07-30 | Toshiba Corp | Liquid crystal display device |
| KR20000062993A (en) * | 1999-03-23 | 2000-10-25 | 가나이 쓰토무 | Liquid crystal display apparatus |
| KR20010050411A (en) * | 1999-11-08 | 2001-06-15 | 아끼구사 나오유끼 | Liquid crystal display |
| KR20010113017A (en) * | 2000-06-15 | 2001-12-24 | 마찌다 가쯔히꼬 | Liquid crystal display device, image display device, illumination device and emitter used therefor, driving method of liquid crystal display device, driving method of illumination device, and driving method of emitter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006118382A2 (en) * | 2005-05-04 | 2006-11-09 | Daewoo Electronics Corporation | Driving apparatus of liquid crystal display having organic electroluminescence backlight |
| WO2006118382A3 (en) * | 2005-05-04 | 2008-08-07 | Daewoo Electronics Corp | Driving apparatus of liquid crystal display having organic electroluminescence backlight |
| JP2008542794A (en) * | 2005-05-04 | 2008-11-27 | デーウー・エレクトロニクス・コーポレイション | Driving device for liquid crystal display device having organic EL backlight |
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