KR20130020308A - Method of driving liquid crystal panel - Google Patents
Method of driving liquid crystal panel Download PDFInfo
- Publication number
- KR20130020308A KR20130020308A KR1020110082863A KR20110082863A KR20130020308A KR 20130020308 A KR20130020308 A KR 20130020308A KR 1020110082863 A KR1020110082863 A KR 1020110082863A KR 20110082863 A KR20110082863 A KR 20110082863A KR 20130020308 A KR20130020308 A KR 20130020308A
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- subpixels
- subpixel
- subpixel group
- 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
- G09G3/2007—Display of intermediate tones
- G09G3/2074—Display of intermediate tones using sub-pixels
-
- 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
-
- 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
- G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
-
- 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
- G09G2320/0204—Compensation of DC component across the pixels in flat panels
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Power Engineering (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
Description
The embodiment relates to a method of driving a liquid crystal panel.
Various display apparatuses for displaying information have been developed. The display device is, for example, a liquid crystal display device, a plasma display panel device, an electrophoretic display device, an organic electro-luminescence display device and a semiconductor. And a semi-conductor light-emitting display device. Among them, the liquid crystal display device has the advantages of light and small, high brightness, full color, and large size, and thus has been in the spotlight in the mainstream of the display device.
The liquid crystal display device displays an image on the liquid crystal panel by adjusting the light transmittance of the liquid crystal cell on the liquid crystal panel according to the grayscale value of the data. When a direct current voltage is applied to a liquid crystal cell arranged in the liquid crystal panel for a long time, the light transmission characteristic of the liquid crystal cell is degraded. This DC fixation causes the afterimage to appear on the image displayed on the liquid crystal panel, which acts as a cause of deterioration of the image quality.
In order to prevent the DC fixation, an inversion liquid crystal display device in which the pixel data signal to be supplied to the liquid crystal cells of the liquid crystal panel is inverted based on a common voltage has been proposed.
1 is a view showing an image of a liquid crystal panel driven in a dot-inversion or horizontal 2-dot inversion method to display a specific image.
1A is a diagram showing an image of a liquid crystal panel driven by a dot inversion method to display a specific image.
FIG. 1B is a view showing an image of a liquid crystal panel driven in a horizontal two-dot inversion manner to display a specific image.
1 shows a specific image displayed in one frame. Referring to FIG. 1, the liquid crystal panel includes a plurality of pixels. The pixel includes three subpixels consisting of R, G, and B.
The dot inversion scheme is a driving scheme in which polarities between adjacent subpixels are changed based on a common voltage in one frame.
In the horizontal 2-dot inversion, two horizontally adjacent subpixels are driven with the same polarity, and two subpixels adjacent to the same polarity subpixels are driven with opposite polarities. In other words, the driving method is to drive two sub-pixels with the same polarity and drive them in the same manner as the dot inversion.
The specific pattern for displaying a gray image is displayed on the liquid crystal panel of FIG. 1A. When the liquid crystal panel is in the normally white mode, a data voltage is applied to the subpixels displayed in black. When the specific pattern is applied, the common voltage applied to the common lines arranged in the row direction may move in one polarity direction to distort the luminance of the corresponding subpixel or the adjacent subpixel.
For example, looking at the first row driven by the same common line, voltage is applied only to odd-numbered pixels PX1, PX3, PX5, and PX7, positive polarity is applied to R and B subpixels, and negative to G subpixels. Polarity is applied. As a result, the positive polarity prevails in the first common line, so that the common voltage may move in the positive polarity direction, thereby distorting the image.
The specific pattern for displaying a gray image is displayed on the liquid crystal panel of FIG. 1B. When the specific pattern is applied, the luminance of the corresponding subpixel or the adjacent subpixel may be distorted.
For example, if you examine the first row driven by the same common line, only the third, fourth, seventh and eighth pixels (PX3, PX4, PX7, PX8) are energized and the third pixel (PX3) In this case, the negative polarity is applied to the R and G subpixels, and the positive polarity is applied to the B subpixel, and in the case of the fourth pixel PX4, the negative polarity is applied to the G and B subpixels, and the positive polarity is applied to the R subpixel. In the case of (PX7), the negative polarity is applied to the R and G subpixels, and the positive polarity is applied to the B subpixel, and in the eighth pixel (PX8), the negative polarity is applied to the G and B subpixels, and the positive polarity is applied to the R subpixel. . As a result, the negative polarity prevails in the first common line, so that the common voltage may move in the negative polarity direction, thereby distorting the image.
The image may be distorted due to the movement of the common voltage, resulting in a color difference, and the image quality may be degraded.
The embodiment provides a method of driving a liquid crystal panel to prevent distortion of an image.
The embodiment provides a method of driving a liquid crystal panel for improving image quality.
A driving method of a liquid crystal panel according to an embodiment includes a liquid crystal panel in which a first subpixel group including a predetermined number of subpixels adjacent to a plurality of subpixels in a row direction is repeated, and the first subpixel group Includes a second subpixel group and a third subpixel group, the second subpixel group and the third subpixel group include the same number of subpixels, and the second subpixel group and the third subpixel group The inverted polarity is applied to the pixel group.
According to an embodiment, a subpixel group including a plurality of subpixels is driven with a dot in version, and a subpixel group adjacent to the subpixel group is driven with different polarities to prevent distortion of an image.
The embodiment improves the image quality by driving a subpixel group including a plurality of subpixels in a dot-in version and driving a subpixel group adjacent to the subpixel group with different polarities.
1 is a view showing an image of a liquid crystal panel driven in a dot-inversion or horizontal 2-dot inversion method to display a specific image.
2 is a diagram illustrating a liquid crystal display according to an exemplary embodiment.
3 is a view illustrating an image of a liquid crystal panel driven by an inversion method according to a first embodiment.
4 is a view showing an image of a liquid crystal panel driven in an inversion method according to a second embodiment.
2 is a diagram illustrating a liquid crystal display according to an exemplary embodiment.
Referring to FIG. 2, a liquid crystal display device includes a
The
The
The gate control signal may include, for example, a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable (GOE). The gate start pulse GSP is a signal for controlling the driving start time of the first gate line of the liquid crystal panel in one frame, and the gate shift clock GSC is a signal for controlling the start timing of each gate driving of the liquid crystal panel. The gate output enable (GOE) is a signal that controls the time point at which the gate signal is sent to each gate line.
The data control signal may include a source start pulse (SSP), a source shift clock (SSC), a source output enable (SOE) signal, a polarity signal (POL) . The source start pulse SSP is a signal that controls the supply time of the data voltage of the first line in one frame, and the source shift clock SSC is a signal that controls the supply time of the data voltage of each line. The source output enable SOE is a signal for controlling a time point at which a data voltage is sent to the
The
The
The
The
The
The
The subpixel 50 is defined by the intersection of the
A
Ripple may occur in the common voltage applied to the
3 is a view illustrating an image of a liquid crystal panel driven by an inversion method according to a first embodiment.
3 shows a specific image displayed in one frame. Referring to FIG. 3A, the liquid crystal panel includes a plurality of pixels. The pixel includes three subpixels consisting of R, G, and B.
In the inversion scheme according to the first exemplary embodiment, the
The
The
Polarities of the
As a result, the
The specific pattern for displaying a gray image is displayed on the liquid crystal panel of FIG. 3A. The image displayed on the liquid crystal panel of FIG. 3A is the same image as the image displayed on the liquid crystal panel of FIG. 1A. When the liquid crystal panel is in the normally white mode, a data voltage is applied to the subpixels displayed in black. When the specific pattern is applied, the polarity of the common voltage applied to the common lines arranged in the row direction is not distorted unlike in FIG. 1A.
For example, considering the first row driven by the same common line, the voltage is applied only to the odd pixels PX1, PX3, PX5, and PX7. Examining the subpixels, the first pixel PX1 has a positive polarity applied to the R and B subpixels, and the negative polarity is applied to the G subpixel, and the third pixel PX3 has a positive polarity, R Negative polarity is applied to the subpixel, positive polarity is applied to the G subpixel for the fifth pixel PX5, and negative polarity is applied to the R and B subpixels for the fifth pixel PX5, and positive polarity is applied to the R subpixel for the seventh pixel PX7. The negative polarity is applied to the G, B subpixels. As a result, the number of subpixels to which positive polarity is applied is the same as the number of subpixels to which negative polarity is applied, so that the image is displayed without distortion of the common voltage to positive or negative polarity, thereby improving display quality and no color difference. .
The specific pattern for displaying a gray image is displayed on the liquid crystal panel of FIG. 3B. The image displayed on the liquid crystal panel of FIG. 3B is the same image as the image displayed on the liquid crystal panel of FIG. 1B. When the specific pattern is applied, the polarity of the common voltage applied to the common lines arranged in the row direction is not distorted unlike in FIG. 1B.
For example, looking at the first row driven by the same common line, voltage is applied only to the third, fourth, seventh and eighth pixels PX3, PX4, PX7, and PX8. In the third pixel PX3, positive polarity is applied to the G and B subpixels, and negative polarity is applied to the R subpixel, and in the fourth pixel PX4, positive polarity is applied to the G subpixel, and negative polarity is applied to the R and B subpixels. Is applied to the R subpixel in the case of the seventh pixel PX7, and negative is applied to the G and B subpixels, and is positive to the R and B subpixels in the eighth pixel PX8. Negative polarity is applied to. As a result, the number of subpixels to which positive polarity is applied is the same as the number of subpixels to which negative polarity is applied, so that the image is displayed without distortion of the common voltage to positive or negative polarity, thereby improving display quality and no color difference. .
In the liquid crystal panel of FIG. 3C, a specific pattern for displaying a yellow image is displayed. In the image applied to the liquid crystal panel of FIG. 3C, the R and G subpixels of each pixel transmit light, and the B subpixel does not transmit light, thereby displaying a yellow image by combining red and green light. When the specific pattern is applied, the common voltage may partially shift to distort the luminance.
For example, looking at the first row driven by the same common line, the voltage is applied only to the B sub-pixels for every pixel. Positive polarity is applied to the B subpixels of the first, second, third and eighth pixels (PX1, PX2, PX3, PX8) and the fourth, fifth, sixth, and seventh pixels (PX4, PX5, PX6, Negative polarity is applied to the B subpixel of PX7). The number of subpixels to which positive polarity is applied is the same as the number of subpixels to which negative polarity is applied, but negative polarity is applied to B subpixels of the fourth, fifth, sixth, and seventh pixels PX4, PX5, PX6, and PX7. The negative polarity is partially repeated, so that the common voltage moves in the negative direction in the region corresponding to the fourth, fifth, sixth, and seventh pixels (PX4, PX5, PX6, and PX7), thereby partially displaying the image. Can be distorted.
4 is a view showing an image of a liquid crystal panel driven in an inversion method according to a second embodiment.
4 shows a specific image displayed in one frame. Referring to FIG. 4A, the liquid crystal panel includes a plurality of pixels. The pixel includes three subpixels consisting of R, G, and B.
In the inversion scheme according to the second embodiment, the
The
The
Polarities of the
As a result, the
The specific pattern for displaying a gray image is displayed on the liquid crystal panel of FIG. 4A. The image displayed on the liquid crystal panel of FIG. 4A is the same image as the image displayed on the liquid crystal panel of FIG. 1A. When the liquid crystal panel is in the normally white mode, a data voltage is applied to the subpixels displayed in black. When the specific pattern is applied, the polarity of the common voltage applied to the common lines arranged in the row direction is not distorted unlike in FIG. 1A.
For example, considering the first row driven by the same common line, the voltage is applied only to the odd pixels PX1, PX3, PX5, and PX7. Examining the subpixels, the first pixel PX1 has a positive polarity applied to the R and B subpixels, and the negative polarity is applied to the G subpixel, and the third pixel PX3 has a positive polarity, R, and B subpixels. Negative polarity is applied to the pixel, R for the fifth pixel PX5, positive polarity is applied to the B subpixel, and negative polarity is applied to the G subpixel, and positive polarity is applied to the G subpixel for the seventh pixel PX7. , A negative polarity is applied to the B subpixel. As a result, the number of subpixels to which positive polarity is applied is the same as the number of subpixels to which negative polarity is applied, so that the image is displayed without distortion of the common voltage to positive or negative polarity, thereby improving display quality and no color difference. .
The specific pattern for displaying a gray image is displayed on the liquid crystal panel of FIG. 4B. The image displayed on the liquid crystal panel of FIG. 4B is the same image as the image displayed on the liquid crystal panel of FIG. 1B. When the specific pattern is applied, the polarity of the common voltage applied to the common lines arranged in the row direction is not distorted unlike in FIG. 1B.
For example, looking at the first row driven by the same common line, voltage is applied only to the third, fourth, seventh and eighth pixels PX3, PX4, PX7, and PX8. In the third pixel PX3, positive polarity is applied to the G subpixel, and negative polarity is applied to the R and B subpixels, and in the fourth pixel PX4, the positive polarity is applied to the R and B subpixels, and the negative polarity is applied to the G subpixel. Is applied, and in the seventh pixel PX7, positive polarity is applied to the G subpixel, and in the case of the eighth pixel PX8, the positive polarity is applied to the R, B subpixel. Negative polarity is applied to the pixel. As a result, the number of subpixels to which positive polarity is applied is the same as the number of subpixels to which negative polarity is applied, so that the image is displayed without distortion of the common voltage to positive or negative polarity, thereby improving display quality and no color difference. .
A specific pattern for displaying a yellow image is displayed on the liquid crystal panel of FIG. 4C. In the image applied to the liquid crystal panel of FIG. 4C, the R and G subpixels of each pixel transmit light, and the B subpixel does not transmit light, thereby displaying a yellow image by combining red and green light. Although the specific pattern is applied, the distortion of the common voltage does not occur, unlike in FIG. 3C, which is partially distorted.
For example, looking at the first row driven by the same common line, the voltage is applied only to the B sub-pixels for every pixel. Positive polarity is applied to the B subpixels of the first, fourth, fifth, and eighth pixels (PX1, PX4, PX5, PX8), and the second, third, sixth, and seventh (PX2, PX3, PX6, PX7 Negative polarity is applied to the subpixel. The number of subpixels to which positive polarity is applied is the same as the number of subpixels to which negative polarity is applied, and there is no portion where the polarity is repeated many times, so that partial common voltage distortion does not occur.
In implementing the first and second embodiments, after applying a data voltage having polarity to the second subpixel group, the polarity is converted using the polarity signal POL applied from the timing controller to the data driver to convert the third subpixel group. The data voltage applied to the first subpixel group may be applied to the data voltage having a polarity opposite to that of the second subpixel group.
Although not shown, in the first and second embodiments, the dot inversion may be driven in the column direction, and the same polarity may be applied in the column direction. It may also be driven in a vertical two-dot inversion manner in the column direction.
10: timing controller 20,120: gate driver
21: gate line 30,130: data driver
31: data line 40: common voltage generator
41: common line 50: pixel area
51: thin film transistor 53: liquid crystal cell
55: parasitic capacitor
Claims (8)
The first subpixel group includes a second subpixel group and a third subpixel group.
The second subpixel group and the third subpixel group include the same number of subpixels,
And the inverted polarity is applied to the second subpixel group and the third subpixel group.
And wherein the second subpixel group and the third subpixel group are respectively applied with different polarities between adjacent subpixels.
And the second subpixel group and the third subpixel group are each composed of four subpixels.
And the second subpixel group and the third subpixel group each consist of six subpixels.
A data line applying a data voltage to the plurality of subpixels;
A data driver for supplying a data voltage to the data line; And
A timing controller for applying a polarity signal to the data driver to impart polarity to the data line,
And a second polarity is applied to the second subpixel group and the third subpixel group by the polarity signal.
And the subpixels have different polarities between adjacent subpixels in the column direction.
And the subpixels have the same polarity between adjacent subpixels in the column direction.
And the subpixel is driven at a 2-dot inversion perpendicular to the column direction.
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KR1020110082863A KR20130020308A (en) | 2011-08-19 | 2011-08-19 | Method of driving liquid crystal panel |
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KR1020110082863A KR20130020308A (en) | 2011-08-19 | 2011-08-19 | Method of driving liquid crystal panel |
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Cited By (4)
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CN103926717A (en) * | 2013-12-31 | 2014-07-16 | 上海中航光电子有限公司 | Display panel, detection circuit of display panel and detection method of display panel |
CN106033165A (en) * | 2015-03-20 | 2016-10-19 | 南京瀚宇彩欣科技有限责任公司 | Fringe field switching electrode arranging and driving method |
US9715858B2 (en) | 2013-11-22 | 2017-07-25 | Samsung Display Co., Ltd. | Display apparatus and method of driving thereof |
WO2018121307A1 (en) * | 2016-12-27 | 2018-07-05 | 惠科股份有限公司 | Liquid crystal display device |
-
2011
- 2011-08-19 KR KR1020110082863A patent/KR20130020308A/en not_active Application Discontinuation
Cited By (10)
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US9715858B2 (en) | 2013-11-22 | 2017-07-25 | Samsung Display Co., Ltd. | Display apparatus and method of driving thereof |
CN103926717A (en) * | 2013-12-31 | 2014-07-16 | 上海中航光电子有限公司 | Display panel, detection circuit of display panel and detection method of display panel |
CN103926717B (en) * | 2013-12-31 | 2016-09-14 | 上海中航光电子有限公司 | The testing circuit of display floater, display floater and detection method thereof |
US9595215B2 (en) | 2013-12-31 | 2017-03-14 | Shanghai Avic Opto Electronics Co., Ltd. | Circuit for testing display panel, method for testing display panel, and display panel |
US10325535B2 (en) | 2013-12-31 | 2019-06-18 | Shanghai Avic Opto Electronics Co., Ltd. | Circuit for testing display panel, method for testing display panel, and display panel |
CN106033165A (en) * | 2015-03-20 | 2016-10-19 | 南京瀚宇彩欣科技有限责任公司 | Fringe field switching electrode arranging and driving method |
WO2018121307A1 (en) * | 2016-12-27 | 2018-07-05 | 惠科股份有限公司 | Liquid crystal display device |
WO2018121586A1 (en) * | 2016-12-27 | 2018-07-05 | 惠科股份有限公司 | Liquid crystal display device and drive method therefor |
WO2018120608A1 (en) * | 2016-12-27 | 2018-07-05 | 惠科股份有限公司 | Liquid crystal display device and driving method therefor |
US10665178B2 (en) | 2016-12-27 | 2020-05-26 | HKC Corporation Limited | Liquid crystal display device and method for driving the same |
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