KR20090004233A - Apparatus for improving response characteristic of liquid crystal display - Google Patents

Apparatus for improving response characteristic of liquid crystal display Download PDF

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Publication number
KR20090004233A
KR20090004233A KR1020070068280A KR20070068280A KR20090004233A KR 20090004233 A KR20090004233 A KR 20090004233A KR 1020070068280 A KR1020070068280 A KR 1020070068280A KR 20070068280 A KR20070068280 A KR 20070068280A KR 20090004233 A KR20090004233 A KR 20090004233A
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KR
South Korea
Prior art keywords
gray level
liquid crystal
unit
data
control signal
Prior art date
Application number
KR1020070068280A
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Korean (ko)
Inventor
김기덕
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020070068280A priority Critical patent/KR20090004233A/en
Publication of KR20090004233A publication Critical patent/KR20090004233A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • 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
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0465—Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
    • 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
    • G09G2320/0252—Improving the response speed
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

An apparatus for improving response characteristic of liquid crystal display is provided to be applied to an overdriving when gray is changed to minimum or maximum by using the brightness of a back light unit. An image enhancement unit(42) outputs a dimming control signal(CTL DIMMING) controlling the brightness of the back light. A timing controller(43) generates a gate control signal(GDC) and a data control signal(DDC). A gate driving unit(44) supplies a scan signal to the gate line(GL1-GLn), and a data driver(45) supplies data to the data line(DL1~DLm). The liquid crystal panel(46) comprises the thin film transistor formed at the intersection of the n gate lines and m data lines. An inverter(48) controls the black light unit(49) according to the dimming control signal.

Description

Improved response characteristics of liquid crystal display device {APPARATUS FOR IMPROVING RESPONSE CHARACTERISTIC OF LIQUID CRYSTAL DISPLAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overdriving technique for improving the response speed in a liquid crystal display, and in particular, to improve the response characteristics by changing the gray level as much as possible and adjusting the brightness of the backlight unit accordingly. An apparatus for improving response characteristics of a device is provided.

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 a major position in the future, it is necessary to satisfy requirements such as low power consumption, thinning, light weight, and high quality.

Liquid crystal display (LCD), a representative display device of a flat panel display device, displays an image by using optical anisotropy of a liquid crystal, and is a cathode ray tube (Cathode) due to thin, small size, low power consumption, and high quality. Ray Tube: 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 can be 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. The timing controller generates a gate control signal for controlling a gate driver and a data control signal for controlling a data driver (TFT-LCD source driver IC) by using the signals input from the system. After sampling, the data is rearranged and supplied to the data driver. The liquid crystal pixels on the liquid crystal panel are driven by the gate driver and the data driver to display an image of the video data.

The response speed of a liquid crystal in a liquid crystal display device is an inherent property of physical properties and has been steadily studied in terms of design and circuit as a material for improving this.

1 is a graph showing the response characteristics of the liquid crystal. In general, the greater the voltage difference across the liquid crystal, the faster the response time of the liquid crystal. For example, the response time is 8.0ms when it is changed to 0 → 255 gray level, the response time is 11.7ms when it is changed to 0 → 176 gray level, and the response time is when it is changed to 176 → 240 gray level. The response time is 8.3ms when changing from 8.3ms to 176 → 255 gray levels.

In addition, a method of improving the response speed of the liquid crystal in a circuit, by comparing the gray signal level of the current frame and the gray signal level of the previous frame, by applying a voltage of a difference greater than the voltage difference between them for one frame Overdriving was performed.

2 illustrates one embodiment of the overdriving. That is, FIG. 2 shows an example in which the transition time is 11.7 ms in the case of gray that changes from 0 to 176 gray levels, and the response speed is improved by inserting 218 gray in the middle of the transition time.

Figure 3 shows another example of overdriving according to the prior art. That is, in FIG. 3A, when the gray level is changed from 0 to 176, as shown in the above description, overdriving is performed by applying a voltage having a larger difference for one frame, thereby performing the original transition time (11.7 ms). ) To some extent. Here, it can be seen that the backlight brightness is fixed at the maximum value '1' regardless of the change in the gray level.

In addition, in FIG. 3B, when the gray level changes from 176 to 240, as shown in the above description, overdriving is performed by applying a voltage having a larger difference for one frame, thereby performing the original transition time (8.3 ms). ) To some extent. Here, it can be seen that the backlight brightness is fixed at the maximum value '1' regardless of the change in the gray level.

As described above, in the liquid crystal display according to the related art, overdriving is performed by applying a higher voltage over a predetermined time when the gray level is changed, and at this time, the backlight luminance is maintained as it is. As a result, since the reaction rate is dependent on the response speed of the liquid crystal, it is difficult to cope with the response speed more adaptively.

In addition, there is a problem that artifacts occur when excessively overdriving to speed up the liquid crystal response.

Furthermore, when the gray level is changed to the maximum gray (255 gray) or the minimum gray (0 gray), there is a problem in that the overdriving cannot be performed at all and the response time cannot be shortened.

Accordingly, an object of the present invention is to provide an apparatus for improving the response characteristics of a liquid crystal in a manner of appropriately adjusting the brightness of the backlight instead of shifting the gray level as much as possible for overdriving in the liquid crystal display.

In order to achieve the above object, the present invention provides a method for shifting a gray level of digital video data as much as possible on a frame-by-frame basis, and outputting a dimming control signal for adjusting the brightness of a backlight in the frame corresponding to the shifted gray level. An image quality improving unit; A timing controller for outputting control signals for controlling the gate driver and the data driver, sampling the digital video data inputted through the image quality improving unit, and reordering the digital video data to supply the data driver to the data driver; A gate driver supplying a scan signal to a gate line on the liquid crystal panel under the control of the timing controller, and a data driver supplying data to the data line; And an inverter configured to control driving of the backlight unit according to the dimming control signal input from the image quality improvement unit, so that the luminance of the irradiation light is changed to correspond to the degree of transition of the gray level.

The image quality improving unit shifts the highest gray level to the highest gray level within one frame, and shifts the remaining gray levels by the same ratio.

The image quality improving unit may output a dimming control signal for maintaining the gray level of the previous frame as it is in the current frame and adjusting the luminance level when the gray level is shifted to the maximum or minimum gray level.

The maximum or minimum gray level is 255 or 0.

The present invention has the effect of significantly improving the response characteristics of the liquid crystal display by shifting the gray level as much as possible during overdriving and adjusting the brightness of the backlight unit accordingly.

In addition, by performing overdriving using the brightness of the backlight unit, there is an effect that the overdriving can be applied even when changing to the highest or lowest gray.

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

4 is a diagram illustrating an embodiment of an apparatus for improving a response characteristic of a liquid crystal display according to the present invention, as shown therein; The image quality improving unit 42 shifts the gray level of the digital video data RGB in units of one frame as much as possible, and outputs a dimming control signal CTL_DIMMING for adjusting the brightness of the backlight in the frame corresponding to the shifted gray level. )Wow; The gate control signal GDC for controlling the gate driver 44 and the data control signal DDC for controlling the data driver 45 using the vertical / horizontal synchronization signals Vsync / Hsync and the clock signal DCLK. A timing controller (43) for generating a digital signal, and rearranging the digital video data (RGB) input through the image quality improving unit (42) and rearranging the digital video data (RGB); A gate driver 44 for supplying a scan signal to the gate lines GL1 to GLn on the liquid crystal panel 46 under the control of the timing controller 43; A data driver 45 for supplying data to data lines DL1 to DLm on the liquid crystal panel 46 under the control of the timing controller 43; The liquid crystal panel 46 in which m × n liquid crystal cells Clc are arranged in a matrix type, m data lines DL1 to DLm and n gate lines GL1 to GLn cross each other, and a thin film transistor is formed at an intersection thereof. and; A DC / DC converter 47 for generating various driving voltages required by the liquid crystal panel 46 and each unit; An inverter 48 for controlling the driving of the backlight unit 49 according to the dimming control signal CTL_DIMMING input from the image quality improving unit 42; The backlight unit 49 is driven by the inverter 48 and irradiates a backlight to the liquid crystal panel 46 so as to vary the luminance of light irradiated corresponding to the degree of transition of the gray level. Referring to Figure 5 attached to the operation of the present invention configured in detail as follows.

The liquid crystal panel 46 includes a plurality of liquid crystal cells Clc arranged in a matrix at the intersection of the data lines DL1 to DLm and the gate lines GL1 to GLn. Each transistor TFT formed in the liquid crystal cell Clc transfers an image signal voltage input from the data lines DL1 to DLm to the liquid crystal cell Clc in response to a scan signal supplied from the gate lines GL1 to GLn. do. In addition, a storage capacitor Cst is formed in each of the liquid crystal cells Clc, which is formed between the pixel electrode of the liquid crystal cell Clc and the front gate line, or between the pixel electrode and the common electrode of the liquid crystal cell Clc. It is formed to maintain a constant voltage of the liquid crystal cell (Clc).

The timing controller 43 uses the vertical / horizontal synchronization signal Vsync / Hsync and the clock signal DCLK supplied from the system 41 through the image quality improvement unit 42 to control the gate driver 44. A control signal GDC and a data control signal DDC for controlling the data driver 45 are generated. In addition, the timing controller 43 samples the digital video data RGB inputted from the system 41, rearranges the digital video data RGB, and supplies the data to the data driver 45.

The gate driver 44 sequentially supplies scan pulses (gate pulses) to the gate lines GL1 to GLn in response to the gate control signal GDC from the timing controller 43 to supply data. Select the horizontal lines on (46).

The data driver 45 converts the digital video data RGB into an analog image signal voltage (data voltage) corresponding to the gray scale value in response to the data control signal DDC from the timing controller 43, The converted image signal voltage is supplied to the data lines DL1 to DLm of the liquid crystal panel 46.

The DC / DC converter 47 uses an analog power supply voltage VDD, a ground voltage VGND, a common voltage VCOM, a gate on (or high) voltage VGH, and a gate off (or low) using a power supply voltage supplied from the system 41. Generate the voltage VGL.

The image quality improving unit 42 receives the digital video data from the system 41 and performs the image quality improvement on them in a predetermined unit (for example, in a frame unit) as follows. Output to the timing controller 43.

When the gray level of any digital video data changes in the current frame compared to the previous frame For example, when the gray level changes from 0 to 176, the gray level is changed from 0 to 176 as shown in FIG. Change it to the maximum level (0 → 255) instead of using it. Instead, the dimming control signal CTL_DIMMING is output to the inverter 48 so that the luminance of the backlight is not fixed to the maximum level '1 (100%)' as usual, but is reduced to '0.41 (41%)'.

In this case, the transition time is 8.0ms, which is much smaller than using the conventional overdriving as shown in FIG.

As another example, when the gray level is changed from 176 to 240, the gray level is not changed from 176 to 240 as shown in FIG. 5B, but is changed to the maximum level (176 to 255). Instead, the dimming control signal CTL_DIMMING is output to the inverter 48 such that the luminance of the backlight is not fixed to the maximum level '1' as in the usual case, but becomes '0.96'.

In this case, the transition time is 6.4 ms, which is much smaller than using the conventional overdriving as shown in FIG.

When changing to 255 gray or 0 gray, the conventional overdriving method is not applicable, but the present invention as described above is applicable. For example, if the gray level changes from 240 (previous frame) to 255 (current frame), the gray level is fixed from 255 (previous frame) to 255 (current frame), but if the brightness of the backlight is changed from 0.96 to 1, 3 ms (CCFL: 3ms, LED: 1ms) or less response time can be obtained.

The image quality improvement unit 42 transits the gray level of the digital video data RGB to the timing controller 43 at the maximum in units of frames in the same manner as described above. For example, if the highest transition gray level of the original one frame of digital video data (RGB) was 240, it is increased to the maximum of 255 and the transition gray level is increased at the same rate for the remaining digital video data. In addition, as described above, a dimming control signal CTL_DIMMING for adjusting (lowering) the brightness of the backlight in the corresponding frame is output to the inverter 48 corresponding to the increased gray level.

Accordingly, the inverter 48 controls the driving of the backlight unit 49 according to the dimming control signal CTL_DIMMING input from the image quality improving unit 42, whereby the backlight unit 49 controls the liquid crystal panel. The luminance of the light irradiated to the (46) side is adjusted as above.

1 is a graph showing liquid crystal response characteristics in a liquid crystal display.

2 is a waveform diagram showing the principle of overdriving in a conventional liquid crystal display.

3A and 3B are waveform diagrams showing an example of overdriving according to the prior art;

4 is a block diagram of a response characteristic improving apparatus of a liquid crystal display according to the present invention;

5 (a) and 5 (b) are waveform diagrams showing examples of overdriving according to the present invention.

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

41: system 42: image quality improvement unit

43: timing controller 44: gate driver

45: data driver 46: liquid crystal panel

47: DC / DC converter 48: inverter

49: backlight unit

Claims (6)

An image quality improving unit for shifting the gray level of the video data in a predetermined unit as much as possible and outputting a dimming control signal for adjusting the brightness of the backlight corresponding to the shifted gray level; A timing controller for sampling and rearranging the video data input through the image quality improving unit and supplying the rearranged data to the data driver; A gate driver supplying a scan signal to a gate line on the liquid crystal panel under the control of the timing controller, and a data driver supplying data to the data line; And an inverter configured to control driving of the backlight unit according to the dimming control signal input from the image quality improvement unit, so that the luminance of the irradiated light varies according to the degree of transition of the gray level. Property improving device. The apparatus of claim 1, wherein the predetermined unit is a frame unit. The apparatus of claim 1, wherein the dimming control signal is output to adjust the brightness of the backlight in the corresponding frame. The apparatus of claim 1, wherein the image quality improvement unit is configured to shift the highest gray level to the highest gray level within one frame and to shift the remaining gray levels at the same ratio. The method of claim 1, wherein the image quality improving unit is configured to output a dimming control signal for maintaining the gray level in the previous frame as it is in the current frame and adjusting the luminance level when the gray level is shifted to the maximum or minimum gray level. A response characteristic improvement device for a liquid crystal display device. The apparatus of claim 5, wherein the maximum or minimum gray level is 255 or 0. 7.
KR1020070068280A 2007-07-06 2007-07-06 Apparatus for improving response characteristic of liquid crystal display KR20090004233A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101025801B1 (en) * 2009-07-13 2011-04-04 주식회사 티엘아이 Liquid Crystal Display Device for improving contrast with widening the distribution range of RGB data
CN114495841A (en) * 2020-11-13 2022-05-13 京东方科技集团股份有限公司 Readable storage medium, display device and backlight control device and method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101025801B1 (en) * 2009-07-13 2011-04-04 주식회사 티엘아이 Liquid Crystal Display Device for improving contrast with widening the distribution range of RGB data
CN114495841A (en) * 2020-11-13 2022-05-13 京东方科技集团股份有限公司 Readable storage medium, display device and backlight control device and method thereof
CN114495841B (en) * 2020-11-13 2023-09-15 京东方科技集团股份有限公司 Readable storage medium, display device, backlight control device and control method thereof

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