KR20080079948A - Liquid crystal display apparatus of vertical 2-dot inversion type - Google Patents

Liquid crystal display apparatus of vertical 2-dot inversion type Download PDF

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Publication number
KR20080079948A
KR20080079948A KR1020070020613A KR20070020613A KR20080079948A KR 20080079948 A KR20080079948 A KR 20080079948A KR 1020070020613 A KR1020070020613 A KR 1020070020613A KR 20070020613 A KR20070020613 A KR 20070020613A KR 20080079948 A KR20080079948 A KR 20080079948A
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KR
South Korea
Prior art keywords
liquid crystal
data
pixel
dot
gate
Prior art date
Application number
KR1020070020613A
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Korean (ko)
Inventor
윤상필
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020070020613A priority Critical patent/KR20080079948A/en
Publication of KR20080079948A publication Critical patent/KR20080079948A/en

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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
    • 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
    • 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
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes

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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)
  • Power Engineering (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

An LCD(Liquid Crystal Display) of a vertical two dot Z-inversion type is provided to implement the two dot Z- inversion type by arranging positive or negative pixels in a zigzag form two by two and applying voltage of the same polarity, thereby improving flickers. A timing controller(31) outputs various control signals for controlling driving of a gate driver(32) and a data driver(33). The gate driver supplies a gate on signal to each gate line of an LC panel(34). The data driver supplies a data signal to each data line of the LC panel in correspondence with vertical two dot Z-inversion driving. The LC panel displays an image by being driven by the data signal and a scan pulse. The LC panel has pixels which are arranged in zigzag form two by two in each horizontal line based on each data line. The LC panel makes the pixels driven in a vertical two dot Z- inversion type by the gate signal and the data signal.

Description

Vertical 2-dot shock-inversion liquid crystal display device {LIQUID CRYSTAL DISPLAY APPARATUS OF VERTICAL 2-DOT INVERSION TYPE}

1 is a pixel structure diagram of a one-dot Z-inversion scheme in a conventional liquid crystal display device.

2A and 2B are exemplary views showing the arrangement of pixel electrodes according to the one dot Z-inversion scheme.

3 is a block diagram of a vertical two-dot Z-inversion driving circuit of the liquid crystal display device according to the present invention;

4A and 4B are exemplary views showing an arrangement of pixel electrodes according to a 2-dot Z-inversion scheme.

*** Description of the symbols for the main parts of the drawings ***

31: timing controller 32: gate driver

33: data driver 34: liquid crystal panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel driving technology of a liquid crystal display device, and in particular, to drive a liquid crystal panel in a Z-inversion manner to improve the generation of flicker variation and image quality characteristic variation over time. An inversion liquid crystal display device.

Recently, with the development of information technology (IT), the importance of the display as a visual information transmission medium is further emphasized, and in order to preoccupy major positions in the future, the requirements for low power consumption, thinness, light weight, and high quality should be satisfied. .

Liquid crystal display, which is a typical display device of flat panel display, displays an image by using optical anisotropy of liquid crystal. Cathode ray tube due to thin, small size, low power consumption and high quality It is being developed as a major product of flat panel display that can replace CRT.

In general, a liquid crystal display device is a display device in which image information is individually supplied to pixels arranged in a matrix, and a desired image is displayed by adjusting light transmittance of the pixels. Accordingly, the liquid crystal display includes a liquid crystal panel in which pixels, which are the smallest unit for implementing an image, are arranged in an active matrix form, and a driving unit for driving the liquid crystal panel. Since the LCD does not emit light by itself, a backlight unit is provided to supply light to the LCD.

Briefly explaining the driving principle of the liquid crystal display, the system supplies the digital video data, the vertical / horizontal synchronization signal, and the clock signal to the timing controller, and the timing controller uses the gate driver by using the signals input from the system. A gate control signal for controlling and a data control signal for controlling the data driver are generated, the digital video data is sampled, rearranged, and supplied to the data driver. The liquid crystal panel is driven by the gate driver and the data driver to display an image of the video data.

The driving method of the liquid crystal panel includes line inversion, column inversion, and dot inversion depending on the phase of the data signal applied to the data line. The line inversion method is a method of inverting and applying a phase of a data signal applied to a data line for each line, and the column inversion method is a method of inverting and applying a phase of a data signal applied to a data line for each column. The dot inversion method is a method of inverting and applying a phase of a data signal applied to a data line for each column and line.

As described above, the reason for inverting the phase of the data signal and applying the same to the data line is to prevent crosstalk from occurring due to deterioration of the liquid crystal when the same voltage is continuously applied between the pixel electrode and the common electrode. to be.

In general, the dot inversion method is known to be able to implement a better image quality because less crosstalk occurs than the line inversion method or column inversion method. This is because pixel voltages of different phases are applied to adjacent pixel electrodes.

Recently, a 1-dot z-inversion scheme has been proposed. FIG. 1 illustrates a pixel structure according to a conventional one dot Z-inversion scheme. As shown in FIG. 1, pixels are alternately arranged left and right for each horizontal line based on each data line DL. It is a structure. The pixel includes a thin film transistor TFT, a liquid crystal cell Clc, and a storage capacitor Cst.

2A and 2B show an arrangement of pixel electrodes according to the one dot Z-inversion scheme.

For example, in the odd frame, when a positive polarity (+) pixel voltage is applied to the m and nth pixels as shown in FIG. 2A, a negative polarity (−) is applied to the m, n + 1th pixels of the next adjacent horizontal line. The pixel voltage is applied to each pixel in a manner that a pixel voltage of is applied.

In the even frame, as shown in FIG. 2B, a negative pixel voltage is applied to the m and n-th pixels, and a positive pixel voltage is applied to the m, n + 1 th pixels of the next horizontal line. Apply a pixel voltage.

However, when the liquid crystal panel is driven in a one-dot Z-inversion method, it is difficult to improve the flicker phenomenon, and thus there is a problem in that image quality characteristics are deteriorated.

Accordingly, an object of the present invention is to provide a circuit for reducing the variation of flicker and image quality characteristics with time in driving a liquid crystal panel of a liquid crystal display device in a Z-inversion method.

The present invention for achieving the above object is a timing controller for outputting various control signals for controlling the drive of the gate driver and the data driver; A gate driver supplying a gate-on signal to each gate line of the liquid crystal panel; A data driver for supplying a data signal to each data line of the liquid crystal panel, the data driver corresponding to a vertical two-dot Z-inversion drive; In the display of an image driven by the data signal and the scan pulse, two pixels are arranged in a zigzag manner on each horizontal line with respect to each data line, and they are vertically two dots by the data driver. Characterized in that it comprises a liquid crystal panel to be driven in a Z-inversion method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a block diagram showing an embodiment of a vertical two-dot Z-inversion liquid crystal display device according to the present invention. As shown therein, the driving of the gate driver 32 and the data driver 33 is controlled. A timing controller 31 for outputting various control signals for carrying out the control; A gate driver 32 for supplying a gate-on signal (scan pulse) to each gate line of the liquid crystal panel 34; A data driver 33 for supplying a data signal to each data line of the liquid crystal panel 34, the data driver corresponding to a vertical two-dot Z-inversion drive; In the display of an image driven by the data signal and the scan pulse, two pixels are arranged in a zigzag manner on each horizontal line with respect to each data line, and they are arranged in a vertical two-dot Z-inversion manner. It is configured to include a liquid crystal panel 34 to be driven, and will be described in detail with reference to Figure 4 attached to the operation of the present invention configured as described above.

The timing controller 31 may include a gate control signal GDC for controlling the gate driver 32 and a data control signal for controlling the data driver 33 using a vertical / horizontal synchronization signal and a clock signal supplied from the system. DDC). In addition, the timing controller 31 samples the digital video data RGB input from the system, rearranges the digital video data RGB, and supplies the data to the data driver 33.

The gate driver 32 sequentially supplies a gate-on signal (scan pulse) VGH to the gate line GL in response to the gate control signal GDC input from the timing controller 31. Horizontal lines of the liquid crystal panel 34 to which is supplied are selected.

The data driver 33 converts the digital video data RGB into a data voltage (analog gamma compensation voltage) corresponding to the gray scale value in response to the data control signal DDC input from the timing controller 31. The converted data voltage is supplied to the data line DL on the liquid crystal panel 34.

The liquid crystal panel 34 includes a plurality of liquid crystal cells Clc arranged in a matrix at the intersection of the data line DL and the gate line GL, and the plurality of liquid crystal cells Clc are connected to the data signal. It is driven by the gate-on signal to display an image.

For reference, in the above description, the data driver 33 and the gate driver 32 are separately installed from the liquid crystal panel 34. However, in recent years, each of them is directly mounted on the liquid crystal panel 34 by packaging technology. Is in.

Meanwhile, in the present invention, the liquid crystal panel 34 is driven by a 2-dot Z-inversion method. For this purpose, the pixel array is as shown in FIG. 3.

That is, pixels are disposed alternately with two horizontal lines on the left and right sides with respect to each data line DL. The pixel includes a thin film transistor TFT, a liquid crystal cell Clc, and a storage capacitor Cst.

For example, a data line gate line (GL n-1), ( GL n) on the horizontal line is arranged for the pixel on the right side, and the next gate line (GL n-1) when on the basis of (DL m-1) Pixels were arranged on the left side in the horizontal line on, (GL n ).

Likewise, the gate lines when, based on the data line (DL m) (GL n- 1), (GL n) is disposed for the pixel on the right side, and the next gate line (GL n-1), ( GL horizontal line on the The pixels are arranged on the left side in the horizontal line on n ).

In this manner, two pixels were alternately arranged on the left and right sides while moving in the vertical direction with respect to each data line DL.

4A and 4B illustrate an arrangement of pixel electrodes according to the two-dot Z-inversion scheme of the present invention with respect to an odd frame and an even frame. The arrangement of the pixel electrodes is determined by a data signal of a vertical two-dot Z-inversion scheme supplied from the data driver 33.

For example, in an odd frame, a positive pixel voltage is applied to the m, n pixel and the m, n + 1 pixel in succession as shown in FIG. 4A, and the next m, n + 2nd pixel is applied. A negative pixel voltage of negative polarity is applied to the pixel and the m, n + 3 th pixels in succession.

In the even frame, as shown in FIG. 4B, a negative pixel voltage is applied to the m, n-th pixel and the m, n + 1-th pixel in succession, and the next m, n + 2-th pixel and m, A positive pixel voltage is applied successively to the n + 3 th pixel.

As a result, in the present invention, two pixels are arranged in a zigzag manner ('Z' type) on the basis of each data line on the liquid crystal panel 34, and these are vertical two-dot Z- by a gate-on signal and a data signal. It was driven by the inversion method.

The two-dot Z-inversion driving method can be applied to both the TN mode and the IPS mode.

As described in detail above, the present invention implements a two-dot Z-inversion scheme by arranging two positive or negative pixels in a zigzag manner dm and applying voltages of the same polarity thereto. The flicker phenomenon is improved, thereby improving image quality characteristics.

Claims (3)

A timing controller for outputting various control signals for controlling the driving of the gate driver and the data driver; A gate driver supplying a gate-on signal to each gate line of the liquid crystal panel; A data driver for supplying a data signal to each data line of the liquid crystal panel, the data driver corresponding to a vertical two-dot Z-inversion drive; In the display of an image driven by the data signal and the scan pulse, two pixels are arranged in a zigzag manner on each horizontal line with respect to each data line, and the pixels are vertically aligned by the gate signal and the data signal. A vertical two-dot Z-inversion liquid crystal display device comprising a liquid crystal panel configured to be driven by a two-dot Z-inversion method. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal panel includes pixels arranged alternately on the left and right sides of the liquid crystal panel in the vertical direction on each data line. The data driver of claim 1, wherein the data driver applies a positive pixel voltage to the m, n-th pixel and the m, n + 1-th pixel consecutively in the odd frame, and the next m, n + 2th pixel and m, n + The pixel voltage of negative polarity is continuously applied to the third pixel, and the pixel voltage of negative polarity is continuously applied to the m, n-th pixel and the m, n + 1th pixel in the even frame, and the next m, n + is applied. A vertical two-dot Z-inversion liquid crystal display device configured to apply a positive pixel voltage successively to a second pixel and an m, n + 3rd pixel.
KR1020070020613A 2007-02-28 2007-02-28 Liquid crystal display apparatus of vertical 2-dot inversion type KR20080079948A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110064116A (en) * 2009-12-07 2011-06-15 엘지디스플레이 주식회사 Liquid crystal display
KR20110074314A (en) * 2009-12-24 2011-06-30 엘지디스플레이 주식회사 Liquid crystal display device and method for driving the same
US20140184967A1 (en) * 2012-12-11 2014-07-03 Beijing Boe Display Technology Co., Ltd. Method for driving liquid crystal panel, method for testing flicker and liquid crystal display apparatus
US9466255B2 (en) 2012-02-28 2016-10-11 Samsung Display Co., Ltd. Display apparatus and method of driving the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20110064116A (en) * 2009-12-07 2011-06-15 엘지디스플레이 주식회사 Liquid crystal display
KR20110074314A (en) * 2009-12-24 2011-06-30 엘지디스플레이 주식회사 Liquid crystal display device and method for driving the same
US9466255B2 (en) 2012-02-28 2016-10-11 Samsung Display Co., Ltd. Display apparatus and method of driving the same
US20140184967A1 (en) * 2012-12-11 2014-07-03 Beijing Boe Display Technology Co., Ltd. Method for driving liquid crystal panel, method for testing flicker and liquid crystal display apparatus
US9311839B2 (en) * 2012-12-11 2016-04-12 Boe Technology Group Co., Ltd. Method for driving liquid crystal panel, method for testing flicker and liquid crystal display apparatus

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