KR100535348B1 - Gray scale adjustment method of liquid crystal display device - Google Patents
Gray scale adjustment method of liquid crystal display device Download PDFInfo
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- KR100535348B1 KR100535348B1 KR1019980014373A KR19980014373A KR100535348B1 KR 100535348 B1 KR100535348 B1 KR 100535348B1 KR 1019980014373 A KR1019980014373 A KR 1019980014373A KR 19980014373 A KR19980014373 A KR 19980014373A KR 100535348 B1 KR100535348 B1 KR 100535348B1
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2011—Display of intermediate tones by amplitude modulation
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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
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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
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
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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
- 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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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
본 발명은 액정표시소자의 그레이 스케일 조정방법에 관한 것으로서, 보다 구체적으로는 백라이트와 액정패널특성을 만족하는 그레일 스케일을 조정하는 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gray scale adjustment method of a liquid crystal display device, and more particularly, to a method of adjusting a gray scale satisfying backlight and liquid crystal panel characteristics.
본 발명은 전원전압과 접지사이에 다수의 감마보정용 저항이 연결되고, 감마보정용 저항에 전압을 인가하기 위한 다수의 전압인가단자를 구비하는 감마보정회로가 PCB 에 실장되고, 상기 감마조정회로의 전압인가단자가 쇼트되고 쇼트된 전압인가단자가 가변저항에 연결되어 있는 액정표시소자에 있어서,(a) 표현하고자 하는 그레이스케일의 레벨을 결정하여 기준계조전압의 수를 설정하는 단계와; (b) 휘도계를 이용하여 백라이트의 휘도를 측정하는 단계와; (c) 측정된 휘도값을 기준계조전압의 수로 나누어주는 단계와; (d) 설정된 그레이 스케일의 레벨중 첫 번째 레벨에 대한 패턴을 디스플레이시켜 그 그레이 스케일의 레벨에 대한 액정패널의 휘도를 측정하는 단계와; (e) 상기 가변저항을 이용하여 측정된 액정패널의 휘도가 상기 기준계조전압에 따른 휘도값과 일치하도록 조정하는 단계와; (f) 측정된 액정패널의 휘도가 상기 기준계조전압에 따른 휘도값과 일치할 때의 가변저항값을 첫 번째 감마저항의 저항값으로 설정하는 단계와; 상기 (a) 내지 (f) 단계를 통해 설정된 모든 그레이스케일의 레벨에 대하여 수행하여 모든 감마저항의 저항값을 구하는 단계를 포함한다.In the present invention, a plurality of gamma correction resistors are connected between a power supply voltage and ground, a gamma correction circuit having a plurality of voltage applying terminals for applying a voltage to the gamma correction resistor is mounted on a PCB, and the voltage of the gamma adjustment circuit is provided. A liquid crystal display device in which an applied terminal is shorted and a shorted voltage applying terminal is connected to a variable resistor, comprising: (a) setting the number of reference gray scale voltages by determining a level of grayscale to be expressed; (b) measuring the luminance of the backlight using a luminance meter; (c) dividing the measured luminance value by the number of reference gray voltages; (d) displaying a pattern for the first level of the set gray scale levels and measuring the luminance of the liquid crystal panel with respect to the gray scale levels; (e) adjusting the luminance of the liquid crystal panel measured using the variable resistor to match the luminance value according to the reference gray voltage; (f) setting the variable resistance value when the measured luminance of the liquid crystal panel coincides with the luminance value according to the reference gradation voltage as a resistance value of the first gamma resistance; Comprising the steps of all the grayscale set through the steps (a) to (f) to obtain the resistance value of all the gamma resistance.
Description
본 발명은 액정표시소자의 그레이 스케일 조정방법에 관한 것으로서, 보다 구체적으로는 백라이트의 휘도와 액정패널의 특성에 맞게 그레이 스케일을 조정하는 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gray scale adjustment method of a liquid crystal display device, and more particularly, to a method of adjusting gray scale according to brightness of a backlight and characteristics of a liquid crystal panel.
종래에는 그레이 스케일을 조정하기 위한 감마 기준저항(Gamma reference resistor)의 값을 구하기 위해서는 패널의 특성 패러미터인 액정의 유전율 상수와 액정패널의 캐패시터 값(Cst, Cgd, Cgs)을 알아 △Vp를 계산하고, 액정표시소자의 전압에 대한 투과도 특성곡선(T-V curve)를 이용하였다.Conventionally, in order to obtain a value of a gamma reference resistor for adjusting gray scale, ΔVp is calculated by knowing the dielectric constant of the liquid crystal, the characteristic parameter of the panel, and the capacitor values (Cst, Cgd, Cgs) of the liquid crystal panel. The transmittance characteristic curve (TV curve) with respect to the voltage of the liquid crystal display device was used.
즉, 종래에는 원하는 그레이 스케일에 해당하는 전압을 구하기 위하여 도 1의 T-V 곡선에서 y 축의 투과율을 원하는 그레이 스케일(계조)로 나누고, 그 그레이 스케일이 가리키는 x 축의 전압(V1, V2, …, Vx)을 얻는다. 예를 들면, 그레이 스케일 레벨을 64계조로 하는 경우에는 상기 투과율(T)을 8 로 나누고, 그 투과도에 대응하는 전압 즉, 8 가지의 전압을 구한다.That is, conventionally, in order to obtain a voltage corresponding to a desired gray scale, the transmittance of the y-axis is divided by the desired gray scale (gradation) in the TV curve of FIG. 1, and the voltages of the x-axis indicated by the gray scale (V1, V2, ..., Vx) Get For example, in the case where the gray scale level is 64 gradations, the transmittance T is divided by 8, and voltages corresponding to the transmittance, that is, 8 voltages are obtained.
원하는 그레이 스케일에 따라 T-V 곡선에서 얻어진 전압(V1, V2, …, Vx)을 도 2에 도시된 바와같은 종래의 감마보정회로에 이용하면, 그레이 스케일을 얻기 위한 감마저항(R1 - R9)의 값을 구할 수 있었다. When the voltages V1, V2, ..., Vx obtained from the TV curve according to the desired gray scale are used in the conventional gamma correction circuit as shown in Fig. 2, the values of the gamma resistors R1-R9 for obtaining the gray scale are obtained. Could be saved.
종래와 같은 방법으로 구해진 감마저항값을 실제 PCB 에 실장한 다음 테스트를 하게 되면 100mV 이상의 전압강하가 발생되고, 이 PCB를 패널에 연결하면 원하는 계조전압이 얻어지지 않는다.When the gamma resistance value obtained by the conventional method is mounted on the actual PCB and tested, a voltage drop of 100 mV or more is generated. When the PCB is connected to the panel, the desired gray scale voltage is not obtained.
따라서, 실제 측정된 그레이 스케일과 상기에서 계산된 그레이 스케일이 다르기 때문에 감마보정시 튜닝시간이 오래 걸리는 문제점이 있었다. 또한, 그레이 스케일은 백라이트의 휘도에 따라 달라지기 때문에 이와같이 구해진 감마 저항값을 이용하여 그레이 스케일을 조정하더라도 원하는 그레이 스케일을 얻을 수 없는 문제점이 있었다. 특히 백라이트의 휘도가 아주 낮은 경우에는 그레이 스케일이 더 뚜렷하지 않게 때문에 PCB 상태에서의 감마저항값과 액정모듈상에서의 감마저항값이 다르게 되는 문제점이 있었다.Therefore, there is a problem that the tuning time is long during gamma correction because the gray scale actually measured is different from the gray scale calculated above. In addition, since the gray scale varies depending on the brightness of the backlight, there is a problem that a desired gray scale cannot be obtained even if the gray scale is adjusted using the obtained gamma resistance value. In particular, when the brightness of the backlight is very low, the gray scale is not more pronounced, and thus, the gamma resistance value in the PCB state and the gamma resistance value in the liquid crystal module are different.
본 발명은 백라이트의 특성 및 액정패널의 특성에 맞는 감마저항값을 구하여 그레이 스케일을 조정할 수 있는 방법을 제공하는 데 그 목적이 있다.SUMMARY OF THE INVENTION An object of the present invention is to provide a method of adjusting the gray scale by obtaining a gamma resistance value suitable for the characteristics of the backlight and the characteristics of the liquid crystal panel.
상기 목적을 달성하기 위하여, 본 발명은 전원전압과 접지사이에 다수의 감마보정용 저항이 연결되고, 감마보정용 저항에 전압을 인가하기 위한 다수의 전압인가단자를 구비하는 감마보정회로가 PCB 에 실장되고, 상기 감마조정회로의 전압인가단자가 쇼트되고 쇼트된 전압인가단자가 가변저항에 연결되어 있는 액정표시소자에 있어서,(a) 표현하고자 하는 그레이스케일의 레벨을 결정하여 기준계조전압의 수를 설정하는 단계와; (b) 휘도계를 이용하여 백라이트의 휘도를 측정하는 단계와; (c) 측정된 휘도값을 기준계조전압의 수로 나누어주는 단계와; (d) 설정된 그레이 스케일의 레벨중 첫 번째 레벨에 대한 패턴을 디스플레이시켜 그 그레이 스케일의 레벨에 대한 액정패널의 휘도를 측정하는 단계와; (e) 상기 가변저항을 이용하여 측정된 액정패널의 휘도가 상기 기준계조전압에 따른 휘도값과 일치하도록 조정하는 단계와; (f) 측정된 액정패널의 휘도가 상기 기준계조전압에 따른 휘도값과 일치할 때의 가변저항값을 첫 번째 감마저항의 저항값으로 설정하는 단계와; 상기(a) 내지 (f) 단계를 통해 설정된 모든 그레이스케일의 레벨에 대하여 수행하여 모든 감마저항의 저항값을 구하는 단계를 포함하는 것을 특징으로 한다.In order to achieve the above object, in the present invention, a plurality of gamma correction resistors are connected between a power supply voltage and a ground, and a gamma correction circuit having a plurality of voltage applying terminals for applying a voltage to the gamma correction resistor is mounted on a PCB. In the liquid crystal display device in which the voltage application terminal of the gamma adjustment circuit is shorted and the shorted voltage application terminal is connected to a variable resistor, (a) determining the level of grayscale to be expressed and setting the number of reference gray voltages. Making a step; (b) measuring the luminance of the backlight using a luminance meter; (c) dividing the measured luminance value by the number of reference gray voltages; (d) displaying a pattern for the first level of the set gray scale levels and measuring the luminance of the liquid crystal panel with respect to the gray scale levels; (e) adjusting the luminance of the liquid crystal panel measured using the variable resistor to match the luminance value according to the reference gray voltage; (f) setting the variable resistance value when the measured luminance of the liquid crystal panel coincides with the luminance value according to the reference gradation voltage as a resistance value of the first gamma resistance; Comprising the steps of (a) to (f) all the grayscale level set through the step of obtaining a resistance value of the gamma resistance.
액정표시소자의 그레이 스케일조정방법에 있어서, 상기 백라이트의 휘도측정시 화이트상태에서의 휘도를 측정하는 것을 특징으로 한다. A gray scale adjustment method of a liquid crystal display device, characterized in that for measuring the luminance in the white state when measuring the luminance of the backlight.
이하, 첨부된 도면에 의하여 본 발명의 실시예를 상세히 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 3은 본 발명의 실시예에 그레이 스케일 조정방법을 설명하기 위한 도면이다. 도시한 바와 같이, PCB 에 실장된 도 1과 같은 감마보정회로의 그레이 전압 인가단자(V1-VX)를 쇼트시켜 가변저항(VR)에 연결한다. 이때, 가변저항(VR)은 접지전압과 전원전압(Vcc)사이에 연결되어 있다.3 is a view for explaining a gray scale adjustment method in an embodiment of the present invention. As shown, the gray voltage applying terminals V1 -VX of the gamma correction circuit shown in FIG. 1 mounted on the PCB are shorted and connected to the variable resistor VR. At this time, the variable resistor VR is connected between the ground voltage and the power supply voltage Vcc.
예를 들어 그레이스케일 레벨을 64계조로 하는 경우 사용하고자 하는 전압은 8가지로서 8개의 전압인가단자(V1-V8)이 요구된다. 즉 전압인가단자(V1 - V8)에 인가되는 전압은 8V1, 16V2, 24V3, 32V4, 40V5, 48V6, 56V7, 64V8 로 구분된다.For example, when the grayscale level is set to 64 gradations, eight voltages to be used are required, and eight voltage applying terminals V1 to V8 are required. That is, voltages applied to the voltage application terminals V1-V8 are classified into 8V1, 16V2, 24V3, 32V4, 40V5, 48V6, 56V7, and 64V8.
상기와 같이 그레이 전압인가단자(V1-VX)를 가변저항(VR)에 연결한 다음, 도 4에서와 같이 휘도계(21)를 이용하여 백라이트의 휘도를 측정한다. 이때, 백라이트의 휘도측정시 화이트상태(all white)에서 백라이트의 휘도를 측정하고, 측정된 휘도를 기준계조전압수인 8로 나눈다. 예를 들어, 화이트상태에서의 백라이트의 휘도가 128 이면, 휘도는 각각 기준계조전압에 따라 (표 1)에서와 같게 된다.After connecting the gray voltage applying terminals V1 -VX to the variable resistor VR as described above, the luminance of the backlight is measured using the luminance meter 21 as shown in FIG. 4. At this time, the luminance of the backlight is measured in the white state (all white), and the measured luminance is divided by the reference gray voltage of 8. For example, if the luminance of the backlight in the white state is 128, the luminance becomes as shown in Table 1 according to the reference gradation voltage, respectively.
(표 1)Table 1
상기한 바와같이 원하는 계조에 따라 그레이 스케일 레벨에 따른 기준전압값과 백라이트의 휘도값에 대한 데이터를 근거로 하여 백라이트와 패널특성이 만족되는 그레이 스케일을 조정한다.As described above, the gray scale at which the backlight and the panel characteristics are satisfied is adjusted based on the reference voltage value according to the gray scale level and the data on the luminance value of the backlight according to the desired gray scale.
즉, 마이컴(PC, 23)은 계조프로그램을 실행하여 LCD 패널(22)에 그레이 레벨 8 에 대한 패턴을 디스플레이시키고, 그레이 레벨 8 패턴이 디스플레이되는 액정패널의 휘도를 휘도계(21)를 이용하여 측정한다. 휘도계를 이용하여 그레이 레벨 8패턴에 대한 휘도가 16이 될 때까지 가변저항(VR)을 조정한다. 이와같이 가변저항(VR)을 조정하여 그레이 레벨 8패턴에서 휘도가 16이 되면, 그때의 가변저항(VR)의 값을 읽어 도 2에 도시한 감마저항(R1)에 대한 값을 구한다.That is, the microcomputer (PC) 23 executes a gradation program to display the pattern for gray level 8 on the LCD panel 22, and the luminance of the liquid crystal panel on which the gray level 8 pattern is displayed using the luminance meter 21. Measure The variable resistor VR is adjusted until the luminance of the gray level 8 pattern is 16 by using the luminance meter. Thus, when the luminance is 16 in the gray level 8 pattern by adjusting the variable resistance VR, the value of the variable resistance VR at that time is read to obtain the value for the gamma resistance R1 shown in FIG.
이어서, 그레이 레벨 16패턴을 디스플레이한 다음 휘도계(21)를 이용하여 휘도가 32가 될 때까지 가변저항(VR)을 조정하고, 휘도가 32가 되었을 때의 가변저항(VR)의 값을 읽어 도 2에 도시한 감마저항(R2)을 설정한다.Subsequently, the gray level 16 pattern is displayed, and then the variable resistor VR is adjusted using the luminance meter 21 until the luminance reaches 32, and the value of the variable resistor VR when the luminance reaches 32 is read. The gamma resistor R2 shown in FIG. 2 is set.
이와같은 동작을 반복하여 나머지 그레이 레벨에 감마저항값을 구하면, 백라이트의 특성에 잘맞으며, 액정패널의 상태에 적합한 감마저항값을 구하게 되고, 이를 이용하여 그레이 스케일을 조정하면 원하는 그레이 스케일 레벨을 조정하는 것이 용이하다.By repeating the above operation, the gamma resistance value is calculated for the remaining gray levels, and the gamma resistance value suitable for the characteristics of the backlight is obtained, and the gray scale is adjusted by using the gray scale level. It is easy to do
상기한 바와같은 방법으로 그레이 스케일 레벨을 조정하면 액정패널 특성이 약간씩 다른 경우에도 백라이트의 휘도에 알맞게 원하는 그레이 스케일을 조정하는 것이 가능하다.By adjusting the gray scale level in the manner described above, it is possible to adjust the desired gray scale to suit the brightness of the backlight even when the characteristics of the liquid crystal panel are slightly different.
상기한 바와같은 본 발명에 따르면, 본 발명의 그레이 스케일 조정방법은 백라이트의 특성과 액정모듈의 특성에 맞는 그레이 스케일을 조정하는 것이 가능한 이점이 있다.According to the present invention as described above, the gray scale adjustment method of the present invention has the advantage that it is possible to adjust the gray scale according to the characteristics of the backlight and the characteristics of the liquid crystal module.
도 1은 일반적인 액정표시소자의 T-V 특성 그래프,1 is a graph of a T-V characteristic of a general liquid crystal display device;
도 2는 종래의 액정표시소자의 그레이 스케일 조정방법을 설명하기 위한 도면,2 is a view for explaining a gray scale adjustment method of a conventional liquid crystal display device;
도 3은 본 발명의 실시예에 따른 액정표시소자의 그레이 스케일 조정방법을 설명하기 위한 도면,3 is a view for explaining a gray scale adjustment method of a liquid crystal display device according to an embodiment of the present invention;
도 4는 도 3의 방법으로 액정표시소자의 그레이 스케일을 조정하는 일 예를 도시한 도면,4 is a diagram illustrating an example of adjusting a gray scale of a liquid crystal display by the method of FIG. 3;
(도면의 주요 부분에 대한 부호의 설명)(Explanation of symbols for the main parts of the drawing)
VR : 가변저항 V1-VX : 전압인가단자 VR: Variable resistor V1-VX: Voltage supply terminal
R1-R9 : 감마보정용 저항 21 : 휘도계R1-R9: gamma correction resistor 21: luminance meter
22 : LCD 패널 23 : PC 22: LCD panel 23: PC
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| KR100388582B1 (en) * | 2001-02-19 | 2003-06-25 | (주)플렛디스 | Image Quality Control Method of Flat Panel Display |
| KR100908656B1 (en) * | 2002-12-12 | 2009-07-21 | 엘지디스플레이 주식회사 | Method for setting gamma voltage of ferroelectric liquid crystal display |
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| JPH05197352A (en) * | 1991-08-19 | 1993-08-06 | Internatl Business Mach Corp <Ibm> | Liquid crystal display system |
| JPH075433A (en) * | 1993-12-03 | 1995-01-10 | Semiconductor Energy Lab Co Ltd | Method for driving liquid crystal electrooptic device |
| KR960018657A (en) * | 1994-11-11 | 1996-06-17 | 배순훈 | Pixel driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH05197352A (en) * | 1991-08-19 | 1993-08-06 | Internatl Business Mach Corp <Ibm> | Liquid crystal display system |
| JPH075433A (en) * | 1993-12-03 | 1995-01-10 | Semiconductor Energy Lab Co Ltd | Method for driving liquid crystal electrooptic device |
| KR960018657A (en) * | 1994-11-11 | 1996-06-17 | 배순훈 | Pixel driving circuit |
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| US9863762B2 (en) | 2015-04-30 | 2018-01-09 | Samsung Display Co., Ltd. | Method of manufacturing liquid crystal display device and inspection device |
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