KR100213909B1 - Center voltage generating circuit in a lcd panel - Google Patents
Center voltage generating circuit in a lcd panel Download PDFInfo
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- KR100213909B1 KR100213909B1 KR1019960068205A KR19960068205A KR100213909B1 KR 100213909 B1 KR100213909 B1 KR 100213909B1 KR 1019960068205 A KR1019960068205 A KR 1019960068205A KR 19960068205 A KR19960068205 A KR 19960068205A KR 100213909 B1 KR100213909 B1 KR 100213909B1
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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
- G09G3/3696—Generation of voltages supplied to electrode 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
- 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
- G09G3/3614—Control of polarity reversal in general
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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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
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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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
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Abstract
본 발명은 액정디스플레이패널(Liquid Crystal Display Panel: LCD패널)의 중심전압 발생회로에 관한 것이다. 종래의 중심전압 발생회로에 의한 LCD중심전압은 순직류성분으로 극성 반전하는 영상신호 R, G, B 가 갖는 비대칭성의 영향으로 LCD패널에서 원하는 바이어스 전압과 소정 값의 편차를 갖게되고, 이로 인해 LCD화면 상에 플리커(flicker) 현상이 생기며 화면이 뿌옇게 되고 LCD가 열화되는 문제점이 있었다. 본 발명의 중심전압 발생회로는 1H 마다 극성이 반전되는 영상신호와 동일한 주기를 갖지만 위상이 반전된 반전 펄스를 LCD중심전압에 더함으로써, LCD패널에 입력되는 영상신호와 작용하여 교류 성분을 서로 상쇄시킴으로써 플리커현상을 제거하고 LCD패널의 화질 개선 및 LCD의 열화를 방지한다.The present invention relates to a center voltage generating circuit of a liquid crystal display panel (LCD panel). The LCD center voltage of the conventional center voltage generator circuit has a deviation of a desired bias voltage from a predetermined value in the LCD panel due to the asymmetry of the image signals R, G, and B inverting polarity with pure DC components. There was a problem that flicker occurs on the screen, the screen becomes cloudy and the LCD deteriorates. The center voltage generating circuit of the present invention has the same period as the video signal whose polarity is inverted every 1H, but by adding an inverted pulse whose phase is inverted to the LCD center voltage, thereby acting on the video signal input to the LCD panel to cancel the AC components. This eliminates flicker and prevents LCD panel quality improvement and LCD deterioration.
Description
본 발명은 액정디스플레이패널(Liquid Crystal Display Panel: LCD패널)에 관한 것으로, 더욱 상세하게는 반전 펄스를 이용하여 영상신호와 LCD중심전압의 교류 성분을 서로 상쇄시킴으로써 플리커현상을 제거하고 LCD패널의 화질 개선을 이루기 위한 LCD패널의 중심전압 발생회로에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel (LCD panel), and more particularly, by using an inverted pulse to cancel the flicker phenomenon by canceling the alternating current components of the video signal and the LCD central voltage. The present invention relates to a center voltage generation circuit of an LCD panel for achieving an improvement.
도 1은 종래의 LCD패널의 중심전압 발생회로를 나타낸 예시도이고, 도 2는 극성반전펄스신호와 LCD중심전압과의 관계를 나타낸 파형도이다.1 is an exemplary diagram illustrating a center voltage generation circuit of a conventional LCD panel, and FIG. 2 is a waveform diagram illustrating a relationship between a polarity inversion pulse signal and an LCD central voltage.
종래 LCD패널의 중심전압 발생회로는 도 1에 도시한 바와 같이, 휘도신호 Y 및 색신호 C를 입력받아 영상 신호 R, G, B 신호로 변환시켜 주는 RGB 디코더부(100)와, 상기 RGB 디코더부(100)로부터 출력된 영상 신호 R, G, B 를 입력받아 화면 상에 표시해주는 LCD패널(110)과, 상기 LCD패널(110)의 동작 바이어스 전압인 LCD중심전압 Vcom을 발생시키기 위한 중심전압 발생부(120)를 포함한다.As shown in FIG. 1, the center voltage generation circuit of the conventional LCD panel includes an RGB decoder unit 100 for receiving a luminance signal Y and a color signal C and converting them into image signals R, G, and B signals, and the RGB decoder unit. The LCD panel 110 receives the image signals R, G, and B outputted from the 100 and displays them on the screen, and generates a center voltage for generating the LCD center voltage Vcom which is an operating bias voltage of the LCD panel 110. The unit 120 includes.
이와 같이 구성된 종래 중심전압 발생부(120)의 동작을 살펴보자.Let's look at the operation of the conventional center voltage generator 120 configured as described above.
RGB 디코더부(100)는 화면의 밝기에 관계하는 휘도신호 Y와, 그 진폭은 색의 농도에 관계하고 그 위상은 색상에 관계하는 색신호 C를 입력받아, 영상 신호 R, G, B 로 변환시켜 출력시킨다. 이때 상기 RGB 디코더부(100)의 다른 입력인 극성반전펄스신호 FRP는 영상신호 R, G, B를 1수평주사시간 1H마다 극성 반전시킨 후 출력시킨다. 상기 1수평주사시간 1H의 값은 LCD패널의 해상도에 따라 결정되며, 보통 티브이 화상 표시일 경우 1수평주사시간이 약 60㎲, 프레임 주기는 약 30㎳이다.The RGB decoder unit 100 receives the luminance signal Y related to the brightness of the screen, the amplitude related to the color density, and the phase related to the color signal C related to the color, and converts the image signal into R, G, and B. Output it. In this case, the polarity inversion pulse signal FRP, which is another input of the RGB decoder 100, outputs the image signals R, G, and B after inverting the polarity every 1H scanning time. The value of the 1H horizontal scanning time 1H is determined according to the resolution of the LCD panel. In the case of a TV image display, the 1H horizontal scanning time is about 60 ms and the frame period is about 30 ms.
한편, LCD중심전압 Vcom을 결정해 주는 중심전압 발생부(120)내에서, 가변저항 VR1의 일측은 저항 R1을 통해 정(+)전원 VSH에 연결되고, 타측은 저항 R2를 통해 부(-)전원 VSL에 연결된다. 그러므로 정(+)전원과 부(-)전원의 차 전압, 즉 VSH - VSL 전압이 상기 저항 R1, R2 및 가변저항 VR1에 의해 분배되어 LCD중심전압이 결정된다. 상기와 같이 분배된 LCD중심전압은 LCD패널(110)의 동작 바이어스 전압으로 LCD패널(110)에 입력된다.On the other hand, in the center voltage generator 120 that determines the LCD center voltage Vcom, one side of the variable resistor VR1 is connected to the positive power supply VSH through the resistor R1, and the other side is negative through the resistor R2. Connect to the power supply VSL. Therefore, the difference voltage between the positive power supply and the negative power supply, that is, the VSH-VSL voltage is divided by the resistors R1, R2 and the variable resistor VR1 to determine the LCD center voltage. The LCD center voltage distributed as described above is input to the LCD panel 110 as an operating bias voltage of the LCD panel 110.
상기 RGB 디코더부(100)에서 LCD패널(110)에 입력되는 영상신호 R, G, B 는 1수평주사시간 1H 마다 반전되는 교류 신호이다. 따라서, 상기 교류 신호가 갖는 음양 성분의 비대칭성으로 인해 소정의 직류 성분이 생기게 된다. 이에 따라, 중심전압 발생부(120)에서 공급되는 직류 값인 LCD중심전압은 극성 반전하는 영상신호 R, G, B 가 갖는 비대칭성의 영향으로 LCD패널(110)에서 원하는 바이어스 전압V'com과 소정 값의 편차△V를 갖게된다. 이때, 도 2의 빗금친 부분이 LCD에 축적되는 실효전압이다. 도 2에서 알 수 있듯이, 중심전압 Vcom을 기준으로 양일 때 LCD에 축적되는 전압과 음일 때 LCD에 축적되는 전압에 차이가 생기게 된다.The video signals R, G, and B input from the RGB decoder unit 100 to the LCD panel 110 are AC signals that are inverted every one horizontal scanning time 1H. Therefore, a predetermined direct current component is generated due to the asymmetry of the yin and yang component of the AC signal. Accordingly, the LCD center voltage, which is a direct current value supplied from the center voltage generator 120, has a desired bias voltage V′com and a predetermined value in the LCD panel 110 due to the asymmetry of the image signals R, G, and B inverting polarity. Will have a deviation ΔV. At this time, the hatched portion in Fig. 2 is the effective voltage accumulated in the LCD. As can be seen in FIG. 2, there is a difference between the voltage accumulated in the LCD when positive and the voltage accumulated in the LCD when negative based on the center voltage Vcom.
이와 같이 LCD내 축적되는 전압의 음양 값이 차이가 나게 되면 이로 인해 LCD화면 상에 플리커(flicker) 현상이 생기게 된다. 또한, LCD패널의 동작 바이어스 전압인 LCD중심전압 Vcom 영상 신호 R, G, B 신호에 섞여있는 직류성분과 상호작용하여 정확한 기준이 되지 못함으로 인해 LCD패널(110)에 표시되는 화면이 뿌옇게 되고, LCD 자체의 열화가 빨리 진행되어 LCD의 수명이 짧아진다는 문제점이 있었다.As such, when the negative and negative values of the voltage accumulated in the LCD become different, this causes flicker on the LCD screen. In addition, the screen displayed on the LCD panel 110 becomes cloudy because it does not become an accurate reference by interacting with the DC component mixed in the LCD center voltage Vcom video signals R, G, and B signals, which are operating bias voltages of the LCD panel. There is a problem that the deterioration of the LCD itself proceeds quickly and the life of the LCD is shortened.
따라서, 본 발명의 목적은 극성 반전되는 영상신호에서 생기는 비정상적인 교류성분을 상쇄시켜주기 위한 LCD중심전압을 발생시키기 위한 중심전압발생부를 제공함에 있다.Accordingly, an object of the present invention is to provide a center voltage generator for generating an LCD center voltage for canceling an abnormal alternating current component generated from an image signal inverted polarity.
도 1은 종래 LCD패널의 중심전압 발생회로를 나타낸 예시도,1 is an exemplary view showing a center voltage generation circuit of a conventional LCD panel;
도 2는 도 1에서 극성반전펄스신호와 LCD중심전압과의 관계를 나타낸 파형도,FIG. 2 is a waveform diagram illustrating a relationship between a polarity inversion pulse signal and an LCD center voltage in FIG. 1;
도 3은 본 발명의 LCD패널의 중심전압 발생회로를 나타낸 예시도이다.3 is an exemplary view showing a center voltage generation circuit of the LCD panel of the present invention.
도면의 주요부분에 대한 부호의 설명〉Explanation of symbols for main parts of drawings>
100,200: RGB 디코더부100,200: RGB decoder unit
110,210: LCD 패널110,210: LCD panel
120,220: 중심전압 발생회로120,220: center voltage generation circuit
이와 같은 목적을 달성하기 위해서 본 발명은 휘도신호, 색신호 및 반전펄스신호를 입력받아 1수평주사시간 마다 극성 반전되는 영상 신호 R, G, B 로 변환시켜주는 RGB 디코더부와, 상기 RGB 디코더부로부터 출력된 영상 신호 R, G, B를 화면에 표시해주는 표시부와, 상기 표시부의 동작 바이어스 전압인 LCD중심전압을 발생시키는 중심전압발생부를 포함하는 것이 특징이다In order to achieve the above object, the present invention provides an RGB decoder unit for receiving a luminance signal, a color signal, and an inverted pulse signal, and converting them into image signals R, G, and B which are polarized inverted every horizontal scanning time. And a display unit for displaying the output image signals R, G, and B on a screen, and a center voltage generator for generating an LCD center voltage which is an operating bias voltage of the display unit.
상기 중심전압발생부는 상기 RGB 디코더부에 입력된 극성반전펄스신호와 동일한 극성반전펄스신호를 입력받아 비교증폭해 주는 비교수단과, 상기 비교수단에서 증폭된 극성반전펄스신호가 더해진 중심전압을 조정해 주는 분배수단을 포함하는 것이 특징이다.The center voltage generator is configured to compare and amplify the same polarity inversion pulse signal inputted to the RGB decoder to amplify the polarity inversion pulse signal, and to adjust the center voltage to which the polarity inversion pulse signal amplified by the comparison means is added. It is characterized by including a dispensing means.
이하, 본 발명을 첨부도면을 참조로 하여 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
도 3은 본 발명의 LCD패널의 중심전압 발생회로를 나타낸 예시도이다.3 is an exemplary view showing a center voltage generation circuit of the LCD panel of the present invention.
도 3에 도시된 바와 같이, RGB 디코더부(200)는 휘도신호 Y 및 색신호 C를 입력받아 이를 영상 신호 R, G, B 로 변환시켜 출력한다. 이때, RGB 디코더부(200)에 입력되는 다른 제어 신호인 반전신호 FRP에 의해 상기 영상 신호 R, G, B 는 1수평주사시간 1H 마다 극성이 반전된다. 상기 극성 반전된 영상 신호 R, G, B 는 LCD패널(210)의 해당되는 영상 신호 R, G, B 입력단자에 입력된다. 상기 영상 신호 R, G, B 는 파형의 양(+) 성분과 음(-) 성분의 비대칭성으로 인해 약간의 직류성분을 갖는다.As shown in FIG. 3, the RGB decoder 200 receives the luminance signal Y and the color signal C, and converts the luminance signal Y and the image signal R, G, and B into output signals. At this time, the polarity of the video signals R, G, and B is inverted every 1H of horizontal scanning time by the inverted signal FRP, which is another control signal input to the RGB decoder 200. The polarity inverted image signals R, G, and B are input to corresponding image signals R, G, and B input terminals of the LCD panel 210. The video signals R, G, and B have some direct current components due to the asymmetry of the positive and negative components of the waveform.
한편, 본 발명의 중심전압 발생부(220)는 상기 RGB 디코더부(200)에 입력된 극성반전펄스신호 FRP와 동일한 극성반전펄스신호 FRP를 입력받아 비교 증폭해 주는 비교수단(221)과, 적절한 중심전압을 조정해 주는 분배수단(222)을 포함한다. 극성반전펄스신호 FRP는 저항 R1을 통해 비교기의 인버팅 단자로 입력되고, 이는 다시 저항 R2와 R3의 비만큼 비교기에서 적절히 증폭된다. 저항 R2의 일측은 비교기의 인버팅 단자에 연결되고, 타측은 비교기의 출력단자에 연결되어 있다. 또한 저항 R3는 일측이 그라운드(GND)에 연결되고 타측은 비교기의 논인버팅 단자에 연결되어 있다. 비교기에 의해 증폭되고 위상이 반전된 극성반전펄스신호는 결합캐패시터 C1에 의해 직류성분은 걸려지고 이는 다시 LCD 중심전압 Vcom에 더해진다.On the other hand, the center voltage generator 220 of the present invention is compared with the polarity reverse pulse signal FRP input to the RGB decoder unit 200, the polarity reverse pulse signal FRP and the comparison means 221 for amplifying and amplifying appropriately, Distribution means 222 for adjusting the center voltage. The polarity inversion pulse signal FRP is inputted through the resistor R1 to the inverting terminal of the comparator, which is amplified properly in the comparator by the ratio of the resistors R2 and R3. One side of the resistor R2 is connected to the inverting terminal of the comparator, and the other side is connected to the output terminal of the comparator. In addition, one end of the resistor R3 is connected to ground (GND) and the other end is connected to the non-inverting terminal of the comparator. The polarity inverted pulse signal amplified by the comparator and inverted in phase is subjected to the DC component by the coupling capacitor C1, which is added to the LCD center voltage Vcom.
한편, 분배수단(222)내에서, 가변저항 VR1의 일측은 저항 R4를 통해 정(+)전원 VSH에 연결되고, 타측은 저항 R5를 통해 부(-)전원 VSL에 연결된다. 그러므로 정(+)전원과 부(-)전원의 차 전압, 즉 VSH - VSL 전압이 상기 저항 R4, R5 및 가변저항 VR1에 의해 분배되어 LCD중심전압이 결정된다. 상기와 같이 분배된 LCD중심전압은 상기 비교수단(221)에 의해 증폭된 반전 펄스가 더해진 후 LCD패널(210)의 동작 바이어스 전압으로 LCD패널(210)에 입력된다.On the other hand, in the distribution means 222, one side of the variable resistor VR1 is connected to the positive (+) power supply VSH through the resistor R4, and the other side is connected to the negative (-) power supply VSL through the resistor R5. Therefore, the difference voltage between the positive power supply and the negative power supply, that is, the VSH-VSL voltage is distributed by the resistors R4, R5 and the variable resistor VR1 to determine the LCD center voltage. The LCD center voltage distributed as described above is input to the LCD panel 210 as an operation bias voltage of the LCD panel 210 after the inversion pulse amplified by the comparison means 221 is added.
따라서, 상기 RGB 디코더부(200)에 사용된 극성반전신호와 동일한 주기를 갖지만 위상이 반전된 극성반전신호를 LCD중심전압 Vcom에 더함으로써, LCD패널(210)에 입력되는 영상신호 R, G, B 의 교류 성분과 중심전압 Vcom 에 실린 반전신호의 교류 성분은 각각 서로 반대 극성을 갖고서 입력되므로 상기 교류 성분은 서로 상쇄된다. 그러므로 LCD중심전압 Vcom의 직류성분만이 LCD패널(210)의 바이어스 전압인 중심전압으로 동작하게 된다.Accordingly, by adding the polarity inversion signal having the same period as the polarity inversion signal used in the RGB decoder 200 but having the phase inverted to the LCD center voltage Vcom, the image signals R, G, Since the AC component of B and the AC component of the inverted signal carried on the center voltage Vcom are input with opposite polarities, the AC components cancel each other. Therefore, only the DC component of the LCD center voltage Vcom operates as the center voltage which is the bias voltage of the LCD panel 210.
1H 마다 극성 반전하는 영상신호 RGB에 의한 LCD패널의 중심전압값의 변화를 줄이기 위하여 종래의 LCD 중심전압에 동일한 극성반전신호를 실어 LCD패널에 공급함으로써, 파형의 교류 성분을 서로 상쇄시켜 LCD중심전압이 일정한 값을 유지하게 함으로써 LCD화면의 화질을 개선시키고, LCD의 열화를 방지하는 효과가 있다.In order to reduce the change of the center voltage value of the LCD panel due to the image signal RGB which is inverted polarity every 1H, the same polarity inversion signal is loaded on the LCD center voltage of the conventional LCD and supplied to the LCD panel to cancel the AC components of the waveforms to offset the LCD center voltage. Maintaining this constant value improves the image quality of the LCD screen and prevents deterioration of the LCD.
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| KR101243787B1 (en) | 2006-06-22 | 2013-03-18 | 엘지디스플레이 주식회사 | Circuit for revising gamma voltage in liquid crystal display device |
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| CN101398550B (en) * | 2007-09-26 | 2011-02-02 | 北京京东方光电科技有限公司 | Method and device for avoiding image retention |
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| KR101243787B1 (en) | 2006-06-22 | 2013-03-18 | 엘지디스플레이 주식회사 | Circuit for revising gamma voltage in liquid crystal display device |
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