KR100502809B1 - How to operate the LCD - Google Patents
How to operate the LCD Download PDFInfo
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- KR100502809B1 KR100502809B1 KR1019970080203A KR19970080203A KR100502809B1 KR 100502809 B1 KR100502809 B1 KR 100502809B1 KR 1019970080203 A KR1019970080203 A KR 1019970080203A KR 19970080203 A KR19970080203 A KR 19970080203A KR 100502809 B1 KR100502809 B1 KR 100502809B1
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- liquid crystal
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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
- G09G2320/0209—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
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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
- 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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
적, 녹, 청색의 컬러 필터가 세로열로 동일한 색이 나타나도록 형성되어 있고, 상기 삼색은 가로로 반복되도록 형성되어 있는 액정 표시 장치에서, 데이터 신호에 n번째 신호가 들어온 다음, n+1번째 신호가 들어올 때 데이터 신호가 반전되는데, 이 때, 2 화소열 단위로 반전된다. In a liquid crystal display device in which red, green, and blue color filters are formed so that the same color appears in a vertical column, and the three colors are formed to be repeated horizontally, after the nth signal is input to the data signal, the n + 1th When the signal comes in, the data signal is inverted. At this time, the data signal is inverted by two pixel columns.
이러한 2 화소열 반전 구동 방식은 도트 반전 방식과 유사하여 플리커나 크로스토크 등을 방지할 수 있으며, 도트 반전 방식에서 회색 화면에서의 화소의 극성 상태가 프레임 반전 구동 방식에서의 극성 상태와 유사함으로써 나타나는 화질 저하를 방지할 수 있다.The two pixel column inversion driving method is similar to the dot inversion method, thereby preventing flicker or crosstalk.In the dot inversion method, the polarity state of the pixel on the gray screen is similar to that of the frame inversion driving method. The deterioration of image quality can be prevented.
Description
본 발명은 액정 표시 장치에 관한 것으로서, 더욱 상세하게는 액정 표시 장치의 구동 방법에 관한 것이다.The present invention relates to a liquid crystal display device, and more particularly, to a driving method of a liquid crystal display device.
박막 트랜지스터 액정 표시 장치는 박막 트랜지스터를 구동 소자로 사용하여 게이트선을 따라 입력되는 신호에 따라 순차적으로 데이터선을 통하여 입력된 전기적 신호를 액정의 비틀림각과 컬러 필터를 이용하여 화상을 표시한다.The thin film transistor liquid crystal display displays an image by using a twist angle of the liquid crystal and a color filter of an electrical signal sequentially input through the data line according to a signal input along the gate line using the thin film transistor as a driving element.
이러한 박막 트랜지스터 액정 표시 장치는 계속되는 동일한 극성의 전압인가에 의한 액정의 열화 및 플리커(flicker) 등의 불량을 방지하기 위하여 일정 주기마다 액정의 전압 극성을 반대로 걸어준다. Such a thin film transistor liquid crystal display device reverses the voltage polarity of the liquid crystal every predetermined period in order to prevent deterioration of the liquid crystal and defects such as flicker due to continuous voltage application.
도 1a 내지 1b는 이러한 박막 트랜지스터 액정 표시 장치의 반전 구동 방식 중 프레임 반전 구동 방식에 따른 화소의 극성을 나타낸 분포도로서, 대향 전극에 대한 계조 전압의 극성이 프레임을 주기로 반전하도록 하는 구동 방법으로 잔상이나 플리커 등의 현상이 일어나기 쉽다.1A to 1B are distribution diagrams illustrating polarities of pixels according to a frame inversion driving method among the inverting driving methods of the thin film transistor liquid crystal display. Phenomena such as flicker are likely to occur.
도 2a 내지 도 2b는 라인 반전 구동 방식에 따른 화소의 극성을 나타낸 분포도로서, 수평 라인을 주기로 계조 전압의 극성을 반전시켜서 구동하는 방식으로 프레임 반전에서의 단점인 플리커는 나타나지 않으나 데이터간의 간섭에 의해 발생하는 크로스토크(crosstalk)가 나타난다. 2A to 2B are diagrams illustrating polarities of pixels according to the line inversion driving method. In the driving method, the polarity of the gray voltage is inverted at a horizontal line, and flicker, which is a disadvantage in frame inversion, does not appear. The crosstalk that occurs appears.
도 3a 내지 도 3b는 도트(dot) 반전 구동 방식에 따른 화소의 극성을 나타낸 분포도로서, 계조 전압의 극성을 하나의 화소 주기로 반전시켜 모자이크 모양으로 서로 극성이 다르게 함으로써 구동하는 방식으로 플리커나 크로스 토크를 줄일 수 있어 일반적으로 많이 사용하는 방식이다.3A to 3B are distribution diagrams illustrating polarities of pixels according to a dot inversion driving method, in which flicker or crosstalk are driven by inverting polarities of gray voltages by one pixel period and driving them by different polarities in a mosaic shape. It is a commonly used method because it can be reduced.
그러나, 도트 구동 방법 중 도 4a 내지 도 4b에 도시한 것과 같은 화면에서, 회색 화면의 경우는 도 2의 프레임 반전과 거의 유사하게 구동되는 것을 볼 수 있다.However, in the screen as shown in FIGS. 4A to 4B of the dot driving method, it can be seen that the gray screen is driven almost similar to the frame inversion of FIG. 2.
도 4a 내지 4b에 나타난 블랙 화소의 경우 액정의 투과도가 일정하여 미세한 전위차에 의해 투과 특성이 변하지 않는데 비하여 회색 화소의 경우에는 미세한 전위차에 의한 투과율의 변화가 심하여 화질 저하를 가져오게 된다. In the case of the black pixel illustrated in FIGS. 4A to 4B, the transmittance of the liquid crystal is constant and the transmission characteristic does not change due to the minute potential difference.
본 발명이 이루고자 하는 과제는 화질을 개선시킬 수 있는 박막 트랜지스터 액정 표시 장치의 구동 방법을 제공하는 것이다.An object of the present invention is to provide a method of driving a thin film transistor liquid crystal display device capable of improving image quality.
이러한 과제를 이루기 위하여 본 발명에서는 데이터선의 2 라인씩 반전 구동을 한다. 그러면, 본 발명에 따른 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 도면을 참고로 하여 상세히 설명한다.In order to achieve such a problem, in the present invention, inversion driving is performed every two lines of the data line. Then, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the embodiments.
도 5a 내지 도 5b는 본 발명의 실시예에 따른 박막 트랜지스터 액정 표시 장치의 구동 방법에서의 화소의 극성을 도시한 분포도로서, 도 5a 내지 도 5b를 참고로 하여 본 발명의 실시예에 따른 2라인 반전 구동 방식에 대하여 자세히 설명한다.5A through 5B are distribution diagrams illustrating polarities of pixels in a method of driving a thin film transistor liquid crystal display according to an exemplary embodiment of the present invention. Referring to FIGS. The inversion driving method will be described in detail.
먼저, 적, 녹, 청색의 컬러 필터가 각각 형성된 화소열이 1열씩 반복하여 형성되어 있다.First, pixel columns in which red, green, and blue color filters are formed are repeatedly formed one by one.
이러한 구성을 가진 화면에 게이트 신호는 게이트선을 통해 입력되고, 데이터 신호는 데이터선을 통하여 입력된다.The gate signal is input to the screen having such a configuration through the gate line, and the data signal is input through the data line.
이 때, 도 5a에 도시한 바와 같이, n번째 데이터 신호가 들어온 2개의 화소열 중 적색의 컬러 필터가 형성된 적색 화소열과 그 2개의 화소열의 다음에 형성되는 2개의 화소열 중 적색 화소열에 인가되는 데이터 신호의 극성은 반전이다. 또한 2개의 화소열 중 녹색의 화소열과 이 2 개의 화소열 중 인접한 다음 2개의 화소열에서 녹색 화소열에 인가되는 신호의 극성되 반전된다.At this time, as shown in FIG. 5A, the red pixel column in which the red color filter is formed among the two pixel columns into which the n-th data signal is input is applied to the red pixel column in the two pixel columns formed next to the two pixel columns. The polarity of the data signal is inverted. Further, the polarity of the signal applied to the green pixel column in the adjacent two pixel columns of the two pixel columns and the green pixel column of the two pixel columns is inverted.
도 5b에 도시한 것처럼, n+1번째 데이터 신호는 반전된다. 청색 화소열도 위와 같이 신호 반전이 일어난다. As shown in Fig. 5B, the n + 1th data signal is inverted. The signal inversion occurs in the blue pixel column as above.
이와 같은 신호 반전이 2 화소열 단위로 일어난다. 그러나, 신호 반전이 일어나더라도 블랙 화소의 신호는 변하지 않는다. Such signal reversal occurs in units of two pixel columns. However, even if signal inversion occurs, the black pixel signal does not change.
이와 같이, 2 화소열 단위로 반전 구동함으로써, 도트 반전과 유사하면서도, 도트 반전 구동 방식에서 회색 화면일 경우에 프레임 반전과 유사한 반전이 되어 나타나는 화질 저하를 방지할 수 있다.As described above, by inverting driving in units of two pixel columns, it is possible to prevent deterioration in image quality similar to dot inversion but inverted similar to frame inversion in the gray screen in the dot inversion driving method.
위에서 언급한 바와 같이, 같은 색의 화소열로 2 라인씩 반전 구동함으로써, 플리커나 크로스토크 등을 방지할 수 있으며, 회색 화면일 경우에도 개선된 화질을 제공할 수 있다.As mentioned above, by inverting two lines by the same color pixel column, flicker, crosstalk, and the like can be prevented and improved image quality can be provided even in a gray screen.
도 1a 내지 1b는 이러한 박막 트랜지스터 액정 표시 장치의 반전 구동 방식 중 프레임 반전 구동 방식에 따른 화소의 극성을 나타낸 분포도이고,1A to 1B are distribution diagrams illustrating polarities of pixels according to a frame inversion driving method among the inversion driving methods of the thin film transistor liquid crystal display device.
도 2a 내지 도 2b는 라인 반전 구동 방식에 따른 화소의 극성을 나타낸 분포도이고,2A to 2B are distribution charts illustrating polarities of pixels according to a line inversion driving method;
도 3a 내지 도 3b는 도트(dot) 반전 구동 방식에 따른 화소의 극성을 나타낸 분포도이고,3A to 3B are distribution diagrams illustrating polarities of pixels according to a dot inversion driving method.
도 4a 내지 도 4b는 도트 반전 구동 방식에서 회색 화면에서의 화소의 극성을 나타낸 분포도이고,4A to 4B are distribution charts showing polarities of pixels on a gray screen in a dot inversion driving method;
도 5a 내지 도 5b는 본 발명의 실시예에 따른 박막 트랜지스터 액정 표시 장치의 구동 방법에서의 화소의 극성을 도시한 분포도이다.5A to 5B are distribution charts illustrating polarities of pixels in a method of driving a thin film transistor liquid crystal display according to an exemplary embodiment of the present invention.
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| KR1019970080203A KR100502809B1 (en) | 1997-12-31 | 1997-12-31 | How to operate the LCD |
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| KR1019970080203A KR100502809B1 (en) | 1997-12-31 | 1997-12-31 | How to operate the LCD |
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| KR100502809B1 true KR100502809B1 (en) | 2005-10-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100751172B1 (en) * | 2000-12-29 | 2007-08-22 | 엘지.필립스 엘시디 주식회사 | 2-dot inversion liquid crystal panel driving method and apparatus therefor |
| KR100806969B1 (en) | 2007-04-02 | 2008-02-25 | 엘지.필립스 엘시디 주식회사 | 2-dot inversion liquid crystal panel driving method and apparatus therefor |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002055661A (en) * | 2000-08-11 | 2002-02-20 | Nec Corp | Drive method of liquid crystal display, its circuit and image display device |
| KR20020034596A (en) * | 2000-11-02 | 2002-05-09 | 주식회사 현대 디스플레이 테크놀로지 | Method for correcting shift of color coordinate in lcd device |
| KR100815911B1 (en) * | 2002-05-28 | 2008-03-21 | 엘지.필립스 엘시디 주식회사 | Driving Method of LCD |
| KR101026802B1 (en) | 2003-11-18 | 2011-04-04 | 삼성전자주식회사 | LCD and its driving method |
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| JPH03167521A (en) * | 1989-11-28 | 1991-07-19 | Fujitsu Ltd | Method for driving liquid crystal panel |
| KR910012788A (en) * | 1989-12-30 | 1991-08-08 | 김정배 | Color filter driving circuit and method of liquid crystal television |
| JPH06175619A (en) * | 1992-12-07 | 1994-06-24 | Fujitsu General Ltd | Method for driving liquid crystal pannel |
| JPH0775135A (en) * | 1993-09-01 | 1995-03-17 | Sharp Corp | Three-dimensional display device |
| KR960038721A (en) * | 1995-04-19 | 1996-11-21 | 구자홍 | How to drive TFE LCD |
-
1997
- 1997-12-31 KR KR1019970080203A patent/KR100502809B1/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03167521A (en) * | 1989-11-28 | 1991-07-19 | Fujitsu Ltd | Method for driving liquid crystal panel |
| KR910012788A (en) * | 1989-12-30 | 1991-08-08 | 김정배 | Color filter driving circuit and method of liquid crystal television |
| JPH06175619A (en) * | 1992-12-07 | 1994-06-24 | Fujitsu General Ltd | Method for driving liquid crystal pannel |
| JPH0775135A (en) * | 1993-09-01 | 1995-03-17 | Sharp Corp | Three-dimensional display device |
| KR960038721A (en) * | 1995-04-19 | 1996-11-21 | 구자홍 | How to drive TFE LCD |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100751172B1 (en) * | 2000-12-29 | 2007-08-22 | 엘지.필립스 엘시디 주식회사 | 2-dot inversion liquid crystal panel driving method and apparatus therefor |
| KR100806969B1 (en) | 2007-04-02 | 2008-02-25 | 엘지.필립스 엘시디 주식회사 | 2-dot inversion liquid crystal panel driving method and apparatus therefor |
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| Publication number | Publication date |
|---|---|
| KR19990059985A (en) | 1999-07-26 |
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