KR100357211B1 - Common electrode driving circuit of liquid crystal - Google Patents
Common electrode driving circuit of liquid crystal Download PDFInfo
- Publication number
- KR100357211B1 KR100357211B1 KR1019950009244A KR19950009244A KR100357211B1 KR 100357211 B1 KR100357211 B1 KR 100357211B1 KR 1019950009244 A KR1019950009244 A KR 1019950009244A KR 19950009244 A KR19950009244 A KR 19950009244A KR 100357211 B1 KR100357211 B1 KR 100357211B1
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- common
- voltage
- liquid crystal
- voltage generator
- common electrode
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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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/043—Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver
-
- 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
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
Abstract
Description
본 발명은 액정의 공통전극 구동회로에 관한 것으로서, 더욱 상세하게는 액정 표시용 패널의 상판 공통전극의 구동을 능동적으로 보상하여 줌으로써 크로스토크를 줄일 수 있도록 한 액정의 공통전극 구동회로에 관한 것이다.The present invention relates to a common electrode driving circuit of a liquid crystal, and more particularly, to a common electrode driving circuit of a liquid crystal capable of reducing crosstalk by actively compensating driving of a top common electrode of a liquid crystal display panel.
제 1 도는 종래의 액정 구동회로의 블럭 구성도를 도시한 것으로, LCD제어부(1)에서는외부입력신호로 부터 공통전극 구동전압(이하, Vcom라 칭함)을발생하는 공통전압발생부(2) 및 그레이 전압을 발생하는 그레이 전압 발생부(3)의 입력신호를 만들며 상기 공통전압 발생부(2) 및 그레이 전압 발생부(3)의 출력전압의 차에 의해 LCD패널(4)을 구동하였다.1 is a block diagram of a conventional liquid crystal driving circuit. In the LCD controller 1, a common voltage generator 2 for generating a common electrode driving voltage (hereinafter referred to as Vcom) from an external input signal and The LCD panel 4 was driven by a difference between the output voltages of the common voltage generator 2 and the gray voltage generator 3 while generating an input signal of the gray voltage generator 3 that generates the gray voltage.
그리고 상기 공통전압 발생부(2)는 제 2 도에 도시한 바와 같이 Vcom의 오차를 줄이기 위하여 연산 증폭기(AMP1)을 사용한 피이드백 회로를 사용하였다.The common voltage generator 2 uses a feedback circuit using an operational amplifier AMP1 to reduce the error of Vcom as shown in FIG.
그러나 상기와 같은 방식으로 구동했을 경우 공통전극과 게이트 라인 및 데이타 라인등의 기생 캐패시턴스에 의한 커플링에 의하여 Vcom에 왜곡이 일어나며 특히 액정에 높은 전위차가 인가되었을 경우 더욱 심하게 나타나며 이러한 현상은 디스플레이상에서 잘못된 계조를 표시하며 크토스토크 현상을 발생하게 되는 문제점이 있었다. 본 발명은 이러한 문제점을 해결하기 위한 것으로, 본 발명의 목적은 공통전압 발생부의 출력단에서 LCD패널에 인가되는 전류량을 검출하여 이를 공통전압 발생부의 입력단으로 피이드백시킴으로써 Vcom의 왜곡을 보상할 수 있도록 한 액정의 공통전극 구동회로를 제공함에 있다.However, when driven in the above manner, distortion occurs in Vcom due to coupling by parasitic capacitance such as common electrode, gate line, and data line, especially when high potential difference is applied to liquid crystal. There was a problem in that the gradation is displayed and a ktorstock phenomenon occurs. The present invention is to solve this problem, an object of the present invention is to detect the amount of current applied to the LCD panel at the output terminal of the common voltage generator to feed back to the input terminal of the common voltage generator to compensate for the distortion of Vcom The present invention provides a common electrode driving circuit for liquid crystals.
이러한 목적을 달성하기 위한 본 발명의 특징은 LCD패널를 구동하기 위한 공통전극 구동전압 및 그레이 전압을 발생하는 공통전압 발생부 및 그레이 전압 발생부와, 외부입력신호로 부터 상기 공통전압 발생부 및 그레이 전압 발생부의 입력신호를 만드는 LCD제어부를 구비하는 액정구동회로에 있어서, 상기 공통전압 발생부의 출력전류량을 검출하여 공통전압 발생부의 입력으로 피이드백시켜 공통전극 구동전압의 왜곡을 보상하는 공통전압 보상부를 더 구비하여 구성되는 액정의 공통전극 구동회로에 있다.Features of the present invention for achieving the above object are a common voltage generator and a gray voltage generator for generating a common electrode driving voltage and gray voltage for driving an LCD panel, and the common voltage generator and gray voltage from an external input signal A liquid crystal drive circuit comprising an LCD control unit for generating an input signal of a generator, wherein the common voltage compensator detects an output current amount of the common voltage generator and feeds it back to an input of the common voltage generator to compensate for distortion of the common electrode driving voltage. The common electrode driving circuit of the liquid crystal is provided.
이하, 본 발명의 일실시예를 첨부도면을 참조로 하여 상세히 설명한다.Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
제 3 도는 본 발명의 블럭 구성도를 도시한 것으로, 제 1 도와 같은 종래의 구성에 공통전압 발생부(2)의 출력전류량을 검출하여 공통전압 발생부(2)의 입력으로 피이드백하여 Vcom의 왜곡을 보상하는 공통전압 보상부(5)가 더 구비되어 구성된다.3 is a block diagram of the present invention. In the conventional configuration as shown in FIG. 1, the output current of the common voltage generator 2 is detected and fed back to the input of the common voltage generator 2. The common voltage compensator 5 is further provided to compensate for the distortion.
상기 공통전압 보상부(5)는 제 4 도에 도시한 바와 같이 Vcom신호라인의 전류량의 변화를 검출하기 위한 출력저항(Rout)과, 상기 출럭저항(Rout)에 의한 검출전류량이 입력되는 연산증폭기(OP2)와, 상기 연산증폭기(OP2)의 증폭율을 결정하는 저항(R1-R4)자, 상기 연산 증폭기(OP2)의 출력전압을 상기 공통전압 발생부(2)의 입력으로 피이드백시키기 위한 피이드백 저항(R5)으로 구성된다.As shown in FIG. 4, the common voltage compensator 5 outputs an output resistor Rout for detecting a change in the amount of current in the Vcom signal line, and an operational amplifier in which the amount of current detected by the rung resistance Rout is input. OP2 and resistors R1-R4 for determining the amplification ratio of the operational amplifier OP2 and for feeding back the output voltage of the operational amplifier OP2 to the input of the common voltage generator 2. It consists of a feedback resistor R5.
상기와 같이 구성된 본 발명은 크로스토크는 액정에 높은 전압이 인가될수록 심하게 나타나며 이 경우 Vcom신호라인에도 더욱 많은 전류가 흐르게 되므로 이 전류량을 공통전압 보상부(5)를 이용하여 검출하여 공통전압 발생부(2)의 입력단에 피이드백 시킴으로써 공통전압 발생부(2)의 출력전압의 왜곡을 보상하는 것으로, 상기 공통전압 보상부(5)는 출력저항(Rout)으로 Vcom신호라인의 전류량을 검출한다.According to the present invention configured as described above, the crosstalk becomes more severe as a high voltage is applied to the liquid crystal. In this case, more current flows in the Vcom signal line. Therefore, the current is detected using the common voltage compensator 5 to detect the current amount. By feeding back to the input terminal of (2), the distortion of the output voltage of the common voltage generator 2 is compensated for, and the common voltage compensator 5 detects the amount of current in the Vcom signal line with the output resistance Rout.
상기 Vcom신호라인의 전류량의 변화는 출력저항(Rout) 양단에 전위차(V1-V2)로 나타나며 이는 연산증폭기(OP2)의 입력으로 되어 저항(R1-R4)에 의해 증폭된 후 피이드백저항(R5)을 통하여 공통전압 발생부(2)와 입력으로 되먹여진다.The change in the amount of current in the Vcom signal line is represented by a potential difference (V1-V2) across the output resistor (Rout), which is input to the operational amplifier (OP2) and amplified by the resistors (R1-R4) and then the feedback resistor (R5). It is fed back to the common voltage generator (2) and the input through.
이때, 상기 연산증폭기(OP2)의 출력전압(Vfb)은 다음과 같이 결정된다.At this time, the output voltage Vfb of the operational amplifier OP2 is determined as follows.
Vl - V2 = ic·Rout, V1 = (V2 + ic·Rout) =V2'Vl-V2 = icRout, V1 = (V2 + icRout) = V2 '
그리고 상기와 같이 얻어지는 연산증폭기(OP2)의 출력전압(Vfb)에 의해 상기 공통전방 발생부(2)는 출력되는 Vcom을 보상하게 된다.The common forward generation unit 2 compensates the output Vcom by the output voltage Vfb of the operational amplifier OP2 obtained as described above.
이상에서 살펴본 바와 같이 본 발명은 액정 표시용 기기에서의 크로스토크 현상은 액정에 인가되는 그래이 전압과 Vcom의 차가 클 경우 심하게 나타나므로 Vcom신호라인에 흐르는 전류량을 검출하여 이를 공통전압 발생부에 피이드백시킴므로써 능동적으로 크토스토크를 감소시킬 수 있게 된다.As described above, in the present invention, the crosstalk phenomenon in the liquid crystal display device is severe when the difference between the gray voltage applied to the liquid crystal and Vcom is large. By doing so, it is possible to actively reduce the ktorstock.
제 1 도는 종래의 액정구동회로의 블럭 구성도1 is a block diagram of a conventional liquid crystal driving circuit
제 2 도는 제 1 도의 공통전압 발생부의 회로도2 is a circuit diagram of a common voltage generator of FIG.
제 3 도는 본 발명의 블럭 구성도3 is a block diagram of the present invention
제 4 도는 제 3 도의 공통전압 보상부의 회로도4 is a circuit diagram of a common voltage compensator of FIG.
*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
1 : LCD제어부 2 : 공통전압 발생부1: LCD control unit 2: common voltage generator
3 : 그레이 전압 발생부 4 : LCD패널3: Gray voltage generator 4: LCD panel
5 : 공통전압 보상부5: common voltage compensation unit
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950009244A KR100357211B1 (en) | 1995-04-19 | 1995-04-19 | Common electrode driving circuit of liquid crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019950009244A KR100357211B1 (en) | 1995-04-19 | 1995-04-19 | Common electrode driving circuit of liquid crystal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR960038722A KR960038722A (en) | 1996-11-21 |
| KR100357211B1 true KR100357211B1 (en) | 2003-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019950009244A KR100357211B1 (en) | 1995-04-19 | 1995-04-19 | Common electrode driving circuit of liquid crystal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105390107A (en) * | 2015-12-07 | 2016-03-09 | 深圳市华星光电技术有限公司 | Liquid crystal display panel common voltage adjustment circuit and liquid crystal display device |
| CN109785811A (en) * | 2019-01-29 | 2019-05-21 | 重庆京东方光电科技有限公司 | A kind of common voltage provides circuit, liquid crystal display panel and its driving method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100483529B1 (en) * | 1997-12-31 | 2005-09-15 | 삼성전자주식회사 | Common voltage generation circuit of liquid crystal display |
| KR100498542B1 (en) * | 2002-09-06 | 2005-07-01 | 엘지.필립스 엘시디 주식회사 | data drive IC of LCD and driving method of thereof |
| KR100999112B1 (en) * | 2003-12-01 | 2010-12-07 | 삼성전자주식회사 | Liquid crystal display device |
| KR102219480B1 (en) | 2014-08-06 | 2021-02-25 | 삼성디스플레이 주식회사 | Common voltage distortion detection circuit, liquid crystal display device and method of driving the same |
-
1995
- 1995-04-19 KR KR1019950009244A patent/KR100357211B1/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105390107A (en) * | 2015-12-07 | 2016-03-09 | 深圳市华星光电技术有限公司 | Liquid crystal display panel common voltage adjustment circuit and liquid crystal display device |
| CN105390107B (en) * | 2015-12-07 | 2018-02-02 | 深圳市华星光电技术有限公司 | Common electric voltage of LCD panel adjustment circuit and liquid crystal display device |
| US10083669B2 (en) | 2015-12-07 | 2018-09-25 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Liquid crystal display panel common voltage adjustment circuit and liquid crystal display device |
| CN109785811A (en) * | 2019-01-29 | 2019-05-21 | 重庆京东方光电科技有限公司 | A kind of common voltage provides circuit, liquid crystal display panel and its driving method |
Also Published As
| Publication number | Publication date |
|---|---|
| KR960038722A (en) | 1996-11-21 |
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