KR20030073071A - Method of correction gamma in lcd - Google Patents

Method of correction gamma in lcd Download PDF

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KR20030073071A
KR20030073071A KR1020020012452A KR20020012452A KR20030073071A KR 20030073071 A KR20030073071 A KR 20030073071A KR 1020020012452 A KR1020020012452 A KR 1020020012452A KR 20020012452 A KR20020012452 A KR 20020012452A KR 20030073071 A KR20030073071 A KR 20030073071A
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common voltage
gamma
gradation
liquid crystal
voltage
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KR1020020012452A
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Korean (ko)
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이상곤
김영구
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비오이 하이디스 테크놀로지 주식회사
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Priority to KR1020020012452A priority Critical patent/KR20030073071A/en
Publication of KR20030073071A publication Critical patent/KR20030073071A/en

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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
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
    • G09G1/14—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam tracing a pattern independent of the information to be displayed, this latter determining the parts of the pattern rendered respectively visible and invisible
    • G09G1/146—Flicker reduction circuits
    • 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
    • G09G3/3696—Generation of voltages supplied to electrode 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

PURPOSE: A method for correcting gamma of a liquid crystal display is provided to eliminate stress factors and mitigate image sticking. CONSTITUTION: A flicker variation is measured while changing a common voltage at each gradation, and an optimum common voltage corresponding to the optimum flicker state is calculated. A difference between the optimum common voltage and a common voltage at a middle gradation is fed back to compensate a gamma reference voltage to mitigate DC stress that has been applied to each gradation. The gamma reference voltage is compensated only in the white gradation region, black gradation region or middle gradation region.

Description

액정표시장치의 감마 보정 방법{METHOD OF CORRECTION GAMMA IN LCD}Gamma correction method of liquid crystal display {METHOD OF CORRECTION GAMMA IN LCD}

본 발명은 액정표시장치의 감마 보정 방법에 관한 것으로, 특히 LCD 모듈의 광특성과 신뢰성 특성에 영향을 주는 액정 디씨(DC) 스트레스(stress)를 감소시켜 잔상을 완화시킨 액정표시장치의 감마 보정 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gamma correction method of a liquid crystal display device. In particular, the gamma correction method of a liquid crystal display device in which an afterimage is alleviated by reducing a liquid crystal DC stress affecting optical characteristics and reliability characteristics of an LCD module. It is about.

LCD 디스플레이 제품은 구조적으로 액정특성 자체가 DC 스트레스에 매우 취약하다. 그러므로, LCD 패널의 구동에서 DC 스트레스는 매우 민감한 문제가 되어왔다. 그러므로 이러한 DC 스트레스를 가능한 억제하기 위한 여러가지 방법들이 시도되고 있지만, 완전한 DC 스트레스를 없애는 것은 매우 어려운 문제이다.LCD display products are structurally very vulnerable to DC stress. Therefore, DC stress has become a very sensitive problem in driving LCD panels. Therefore, various methods have been tried to suppress such DC stress as much as possible, but it is very difficult to eliminate the complete DC stress.

일반적으로, LCD 패널이 DC 스트레스를 많이 받으면 주입구 무라, 프레임 무라, 플리커, 잔상 등의 문제가 심각해지고 액정의 수명도 짧아져서 디스플레이 제품의 화면품위를 떨어뜨릴 뿐 아니라 제품으 수명에도 심각한 타격을 주게된다.In general, when the LCD panel is subjected to a lot of DC stress, problems such as inlet mura, frame mura, flicker, and afterimage are serious, and the life of the liquid crystal is shortened. do.

이러한 문제를 해결하기 위하여 종래의 LCD 디스플레이 제품은 근본적으로 AC 구동을 하고 있으나 포지티브(Positive), 네가티브(Negative) 필드의 정확한 스트레스 조건을 만족시키는 것은 여전히 매우 어려운 문제로 남아 있었다.In order to solve this problem, the conventional LCD display products are basically driven by AC, but it is still very difficult to satisfy the exact stress conditions of the positive and negative fields.

따라서, 본 발명은 상기 문제점을 해결하기 위하여 이루어진 것으로, 본 발명의 목적은 각 계조에서 플리커 레벨(flicker level) 측정을 통한 최적 공통전압(Vcom)값을 찾아내어 역으로 중간 계조에서의 공통전압(Vcom)값과의 편차에 대한 감마 기준의 역보상을 통하여 스트레스(stress) 요인을 제거하고 잔상을 완화시키는 액정표시장치의 감마 보정 방법을 제공하는데 있다.Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to find an optimum common voltage (Vcom) value by measuring flicker level in each gray level and conversely, The present invention provides a gamma correction method of a liquid crystal display device which eliminates stress factors and alleviates afterimages through reverse compensation of a gamma reference against a deviation from a Vcom) value.

도 1은 본 발명에 의한 액정표시장치의 감마 보정 방법을 설명하기 위한 전압 투과율 곡선에서 투과율에 따른 감마 기준전압 설정을 나타낸 그래프도1 is a graph illustrating a gamma reference voltage setting according to transmittance in a voltage transmittance curve for explaining a gamma correction method of a liquid crystal display according to the present invention.

상기 목적을 달성하기 위한 본 발명의 액정표시장치의 감마 보정 방법은,Gamma correction method of the liquid crystal display of the present invention for achieving the above object,

각 계조에서 공통전압을 변화시키면서 플리커의 변화를 측정하고 최적의 플리커 상태에 해당하는 최적의 공통전압을 산출하는 단계와,Measuring the change of the flicker while calculating the common voltage at each gray level and calculating an optimum common voltage corresponding to the optimum flicker state;

상기 최적의 공통전압과 중간계조에서의 공통전압값에 의한 전압차를 피드백하여 감마기준전압에 보상하여 각 계조에서 인가되었던 디씨(DC) 스트레스를 완화하는 단계를 구비한 것을 특징으로 한다.And relieving the DC stress applied in each gray level by feeding back the voltage difference based on the optimum common voltage and the common voltage value in the middle gray level to compensate the gamma reference voltage.

이하, 본 발명의 실시예에 관하여 첨부도면을 참조하면서 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 의한 액정표시장치의 감마 보정 방법을 설명하기 위한 전압 투과율 곡선에서 투과율에 따른 감마 기준전압 설정을 나타낸 그래프도이다.1 is a graph illustrating a gamma reference voltage setting according to transmittance in a voltage transmittance curve for explaining a gamma correction method of a liquid crystal display according to the present invention.

본 발명의 감마 보정 방법은 각 계조에서 공통전압(Vcom)을 변화시키면서 플리커(flicker)의 변화를 측정하고 최적의 플리커 상태에 해당하는 공통전압(Vcom)을 확인한다. 그리고, 테스트 기준이 되는 모든 계조에서의 측정된 공통전압(Vcom)값을 역으로 감마(Gamma)회로에서 역보상하는 방법을 통하여 각 계조에서 인가되었던 DC 스트레스를 완화시키게 된다. 상기와 같은 원리에 의해 DC 스트레스는 감소되고 또한 잔상이 효과적으로 해결된다.The gamma correction method of the present invention measures the change of flicker while changing the common voltage Vcom at each gray level, and checks the common voltage Vcom corresponding to the optimum flicker state. In addition, the DC stress applied to each gray level is alleviated by performing a reverse compensation process of the measured common voltage Vcom values in all gray levels that are the test criteria in the gamma circuit. By the above principle, DC stress is reduced and afterimages are effectively solved.

이하, 본 발명의 감마 보정 방법은 다음과 같다.Hereinafter, the gamma correction method of the present invention is as follows.

먼저, 모듈의 감마 기준전압(포지티브 및 네가티브)을 측정한다.First, the gamma reference voltage (positive and negative) of the module is measured.

그 다음, 옵티스코프(Optiscope)를 사용하여 모듈의 플리커를 측정한다. 이때, 플리커의 측정은 감마 기준전압에 해당 그레이 레벨(Gray level)에서 공통전압(Vcom)을 가변하면서 측정한다. 이때, 공통전압(Vcom)의 가변 조건은 0.01V 단계이다.Next, measure the flicker of the module using an Optiscope. In this case, the flicker is measured while varying the common voltage Vcom at a gray level corresponding to the gamma reference voltage. At this time, the variable condition of the common voltage Vcom is 0.01V steps.

최적 플리커 조건을 찾기 위한, 기준전압 그레이 레벨에서의 공통전압(Vcom)값은 다음과 같다.To find the optimal flicker condition, the common voltage Vcom value at the reference voltage gray level is as follows.

L0 계조에서의 Vcom 전압 = A + α1V(블랙 계조에서의 Vcom값)Vcom voltage at L0 gradation = A + α1V (Vcom value at black gradation)

L16 계조에서의 Vcom 전압 = A + α2VVcom voltage at L16 gradation = A + α2V

L32 계조에서의 Vcom 전압 = A V(중간계조에서의 Vcom값)Vcom voltage at L32 gradation = A V (Vcom value at mid gradation)

L48 계조에서의 Vcom 전압 = A + β1VVcom voltage at L48 gradation = A + β1V

L63 계조에서의 Vcom 전압 = A + β2V(화이트 계조에서의 Vcom값)Vcom voltage at L63 gradation = A + β2V (Vcom value at white gradation)

여기서, α, β의 값은 중간계조에서의 Vcom값과의 편차이다.Here, the values of α and β are deviations from the Vcom value in the halftone.

감마 기준 전압 쉬프트(shift)에 의한 Vcom 역보상 전압은 다음과 같다.The Vcom reverse compensation voltage due to the gamma reference voltage shift is as follows.

L0 계조에서의 감마기준전압 = - α1V(블랙 계조에서의 Vcom값)Gamma reference voltage at L0 gradation =-α1V (Vcom value at black gradation)

L16 계조에서의 감마기준전압 = - α2VGamma reference voltage at L16 gray scale =-α2V

L32 계조에서의 감마기준전압 = A V(중간계조에서의 Vcom값)Gamma reference voltage at L32 gradation = A V (Vcom value at mid gradation)

L48 계조에서의 감마기준전압 = - β1VGamma reference voltage at L48 gradation =-β1V

L63 계조에서의 감마기준전압 = - β2V(화이트 계조에서의 Vcom값)Gamma reference voltage at L63 gradation =-β2V (Vcom value at white gradation)

여기서, α, β의 값은 중간계조에서의 Vcom값과의 편차이다.Here, the values of α and β are deviations from the Vcom value in the halftone.

본 발명에 의한 액정표시장치의 감마 보정 방법은 LCD와 같이 DC 스트레스에 민감한 디스플레이 제품설계에 즉, AC 구동을 하는 제품에 적용이 가능하다.The gamma correction method of the liquid crystal display device according to the present invention can be applied to the design of a display product that is sensitive to DC stress, such as an LCD, that is, to an AC driven product.

이상에서 설명한 바와 같이, 본 발명에 의한 액정표시장치의 감마보정방법에 의하면, 각 계조에서 플리커 레벨(flicker level) 측정을 통한 최적 공통전압(Vcom)값을 찾아내어 역으로 중간 계조에서의 공통전압(Vcom)값과의 편차에 대한 감마 기준의 역보상 해 줌으로써, 스트레스(stress) 요인을 제거할 수 있고, 잔상을 완화시킬 수 있는 효과가 있다. 또한, 플리커나 DC 스트레스로 인하여 발생되는 주입구 무라 등 패널 기인성 무라들의 발생이 억제될 수 있다.As described above, according to the gamma correction method of the liquid crystal display according to the present invention, the optimum common voltage (Vcom) value is found by measuring flicker level at each gray scale, and conversely, the common voltage at the intermediate gray scale is found. By compensating the gamma criterion for the deviation from the (Vcom) value, the stress factor can be eliminated and the afterimage can be alleviated. In addition, the occurrence of panel-induced muras, such as inlet muras caused by flicker or DC stress, can be suppressed.

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.

Claims (4)

액정표시장치의 감마 보정 방법에 있어서,In the gamma correction method of the liquid crystal display device, 각 계조에서 공통전압을 변화시키면서 플리커의 변화를 측정하고 최적의 플리커 상태에 해당하는 최적의 공통전압을 산출하는 단계와,Measuring the change of the flicker while calculating the common voltage at each gray level and calculating an optimum common voltage corresponding to the optimum flicker state; 상기 최적의 공통전압과 중간계조에서의 공통전압값에 의한 전압차를 피드백하여 감마기준전압에 보상하여 각 계조에서 인가되었던 디씨(DC) 스트레스를 완화하는 단계를 구비한 것을 특징으로 하는 액정표시장치의 감마 보정 방법.And compensating for the gamma reference voltage by feeding back the voltage difference based on the optimum common voltage and the common voltage value in the halftone to reduce the DC stress applied in each grayscale. Gamma correction method. 제 1 항에 있어서,The method of claim 1, 상기 감마기준전압 보상 방법은 화이트 계조영역에서만 보상을 적용하는 것을 특징으로 하는 액정표시장치의 감마 보정 방법.The gamma reference compensation method is a gamma correction method of the liquid crystal display, characterized in that the compensation is applied only in the white gradation region. 제 1 항에 있어서,The method of claim 1, 상기remind 감마기준전압 보상 방법은 블랙 계조영역에서만 보상을 적용하는 것을 특징으로 하는 액정표시장치의 감마 보정 방법.The gamma reference voltage compensation method is a gamma correction method of a liquid crystal display, characterized in that the compensation is applied only in the black gradation region. 제 1 항에 있어서,The method of claim 1, 상기 감마기준전압 보상 방법은 중간 계조영역에서만 보상을 적용하는 것을특징으로 하는 액정표시장치의 감마 보정 방법.The gamma reference voltage compensation method is a gamma correction method of a liquid crystal display, characterized in that the compensation is applied only in the halftone region.
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US10062346B2 (en) 2014-12-31 2018-08-28 Samsung Display Co., Ltd Display device, method for driving display device and method for minimizing afterimage of display device
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