WO2017190423A1 - 用于改善余像残留的方法和使用该方法的液晶显示装置 - Google Patents

用于改善余像残留的方法和使用该方法的液晶显示装置 Download PDF

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WO2017190423A1
WO2017190423A1 PCT/CN2016/089738 CN2016089738W WO2017190423A1 WO 2017190423 A1 WO2017190423 A1 WO 2017190423A1 CN 2016089738 W CN2016089738 W CN 2016089738W WO 2017190423 A1 WO2017190423 A1 WO 2017190423A1
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value
common electrode
control signal
electrode voltage
pixel
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PCT/CN2016/089738
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English (en)
French (fr)
Inventor
李文芳
张先明
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深圳市华星光电技术有限公司
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Priority to US15/125,959 priority Critical patent/US20180108306A1/en
Publication of WO2017190423A1 publication Critical patent/WO2017190423A1/zh

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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
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • 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
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0245—Clearing or presetting the whole screen independently of waveforms, e.g. on power-on
    • 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
    • G09G2320/0257—Reduction of after-image effects
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/027—Arrangements or methods related to powering off a display
    • 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
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers

Definitions

  • the present invention relates to the field of liquid crystal display devices, and more particularly to a method for improving image sticking and a liquid crystal display device capable of improving afterimage residual.
  • the liquid crystal display device has the advantages of small size, light weight, and high display quality.
  • the screen displayed by the liquid crystal panel in the liquid crystal display device is composed of a plurality of pixels arranged in an array, and each pixel is usually composed of sub-pixels respectively displaying various colors, and the brightness displayed by each sub-pixel is controlled by a backlight module of the liquid crystal display device.
  • the brightness is determined in conjunction with the gray scale of the sub-pixels of the liquid crystal panel.
  • an exemplary embodiment of the present invention provides a method capable of improving afterimage residual and a liquid crystal display device capable of improving afterimage residual.
  • a method for improving afterimage residual comprising: providing a data voltage to a pixel in a polarity-by-frame inversion manner, wherein when a pixel is written When the positive polarity is entered, the common electrode voltage has a first value, and when the pixel is written to the negative polarity, the common electrode voltage has a second value, and the first value is smaller than the second value.
  • the common electrode voltage may be determined by generating a first control signal when the pixel is written to the positive polarity, and generating a common electrode voltage having the first value in response to the first control signal, Wherein the first control signal is a low voltage control signal; when the pixel is written to the negative polarity, the second control signal is generated, and the common electrode voltage having the second value is generated in response to the second control signal,
  • the second control signal is a high voltage control signal.
  • the step of generating a common electrode voltage having a first value in response to the first control signal includes: selecting the first code in response to the first control signal, the first code corresponding to a total having the first value An electrode voltage, thereby generating a common electrode voltage having a first value; generating a common electrode voltage having a second value in response to the second control signal comprising: selecting a second code in response to the second control signal, the second code corresponding to having The second value of the common electrode voltage produces a common electrode voltage having a second value.
  • the first value may be less than the second value by 0.01V-1V.
  • the first value may be 0.1V smaller than the second value.
  • a liquid crystal display device including a display panel including data lines, gate lines, and pixels, the pixels being configured to be poles Receiving a data voltage in a frame-by-frame inversion manner, wherein when the pixel is written into the positive polarity, the common electrode voltage has a first value, and when the pixel is written to the negative polarity, the common electrode voltage has a second value, the first value Less than the second value.
  • the liquid crystal display device may further include: a controller that generates a first control signal when the pixel is written to the positive polarity, and generates a second control signal when the pixel is written to the negative polarity, wherein The first control signal is a low voltage control signal, and the second control signal is a high voltage control signal; the gamma chip generates a common electrode voltage having a first value in response to the first control signal, and is generated in response to the second control signal A common electrode voltage having a second value.
  • the gamma chip may include a first bank storing a first code and a second bank storing a second code, the first code corresponding to having a first bank and a second bank The first value of the common electrode voltage, the second code corresponds to the common electrode voltage having the second value.
  • the gamma chip may further include a bank selection terminal, wherein the first bank is selected when the bank selection terminal receives the first control signal, thereby generating a total of the first value
  • the electrode voltage selects the second bank when the bank select terminal receives the second control signal, thereby generating a common electrode voltage having the second value.
  • the first value may be less than the second value by 0.01V-1V.
  • the first value may be 0.1V smaller than the second value.
  • the method for improving afterimage residual and the liquid crystal display device using the same can prevent or reduce polarization of liquid crystal, thereby improving afterimage residual.
  • FIG. 1 is a schematic view showing a driving method of a conventional liquid crystal display device
  • FIG. 2 is a schematic diagram showing a method for improving afterimage residual, according to an exemplary embodiment of the present invention
  • FIG. 3 is a schematic diagram showing a method for improving afterimage residual, according to an exemplary embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing a common electrode voltage in a method for improving afterimage residual, which is transformed with each frame, according to an exemplary embodiment of the present invention.
  • first, second, etc. may be used herein to describe different components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. For example, a first component could be termed a second component, without departing from the scope of the example embodiments. Similarly, the second component can be referred to as a first component.
  • FIG. 1 is a schematic illustration showing a driving method of a conventional liquid crystal display device.
  • a driving method in which the common electrode voltage is constant and the polarity of the alternating voltage is periodic in several frames can be employed.
  • the pixel in the Nth frame Frame N, the pixel can be written to the positive polarity, in the N+1th frame Frame N+1, the pixel can be written to the negative polarity, and in the N+2 frame Frame N+2, the pixel can be The positive polarity is written, in the N+3 frame Frame N+3, the pixel can have a negative polarity, and the like, and the common electrode voltage is always kept constant.
  • N may be an integer greater than one.
  • the flipping of the liquid crystal depends on the difference between the gamma voltage (ie, V0, V1, ..., V255) and the common electrode voltage.
  • the common electrode voltage is the average of V0 and V255.
  • the positive and negative polarities are not actually completely symmetrical, and generally the absolute value of the positive polarity is slightly higher than the absolute value of the negative polarity.
  • the liquid crystal will be polarized accordingly, thereby causing residual image to remain.
  • FIGS. 2 and 3 are schematic diagrams illustrating a method for improving afterimage residual, according to an exemplary embodiment of the present invention.
  • 4 is a schematic diagram showing a common electrode voltage in a method for improving afterimage residual, which is transformed with each frame, according to an exemplary embodiment of the present invention.
  • the exemplary embodiment provides a method for improving afterimage residual, the method comprising: providing a data voltage to a pixel in a polarity-by-frame inversion manner, wherein a common electrode is written when positive polarity is written to the pixel The voltage has a first value, and when a negative polarity is written to the pixel, the common electrode voltage has a second value, the first value being less than the second value.
  • the pixel in the Nth frame Frame N, the pixel can be written into the positive polarity, and the common electrode voltage can have a relatively small first value; in the N+1th frame Frame N+1, the pixel can be written.
  • the common electrode voltage may have a relatively large second value; in the N+2 frame Frame N+2, the pixel may be written into the positive polarity, and the common electrode voltage may have a relatively small first value; N+3 frame Frame N+3, the pixel can be written to the negative polarity, the common electrode voltage can have a relatively large second value, and so on.
  • N may be an integer greater than one.
  • writing positive polarity to a pixel means writing positive to the pixel.
  • Polarity pixel voltage; writing negative polarity to a pixel means: writing a negative pixel voltage to the pixel; wherein the pixel voltage is the difference between the data voltage supplied to the pixel and the common electrode voltage, when the data voltage is greater than the supply electrode voltage When the difference between the two is a positive pixel voltage, and when the data voltage is less than the supply voltage, the difference between the two is a negative pixel voltage.
  • the common electrode voltage may be determined by generating a first control signal when the pixel is written to the positive polarity, and generating the common electrode voltage Vcom 1 having the first value in response to the first control signal
  • the first control signal is a low voltage control signal; when the pixel is written to the negative polarity, the second control signal is generated, and the common electrode voltage Vcom 2 having the second value is generated in response to the second control signal, wherein
  • the second control signal is a high voltage control signal.
  • the controller TCON can output a control signal that changes with each frame to the gamma chip GAMMA IC, and the gamma chip GAMMA IC can generate a common electrode voltage in response to the control signal.
  • the gamma chip GAMMA IC may store the first code in the first bank BANK 1 and may store the second code in the second bank BANK 2, the first code corresponding to the common electrode voltage Vcom 1 having the first value
  • the second code corresponds to a common electrode voltage Vcom 2 having a second value.
  • Vcom 1 can be 0.01V-1V smaller than Vcom 2.
  • Vcom 1 can be 0.02V-0.5V smaller than Vcom 2.
  • Vcom 1 can be 0.1V less than Vcom 2 .
  • the step of generating the common electrode voltage Vcom 1 having the first value in response to the first control signal may include: selecting the first code in response to the first control signal, the first code corresponding to having the first a common electrode voltage Vcom1, thereby generating a common electrode voltage Vcom1 having a first value; and generating a common electrode voltage having a second value in response to the second control signal, comprising: selecting a second in response to the second control signal The code, the second code corresponds to the common electrode voltage Vcom 2 having the second value, thereby generating the common electrode voltage Vcom 2 having the second value.
  • the controller TCON may output a control signal that is converted with high and low levels per frame
  • the gamma chip GAMMA IC may receive a control signal output from the controller TCON and generate each frame in response to the control signal.
  • the transformed common electrode voltage When the bank selection terminal BANK_SEL (eg, bank selection pin) in the gamma chip GAMMA IC receives the first control signal having a low voltage, the first bank BANK 1 is selected to generate a common electrode having the first value.
  • the common electrode voltage is changed slightly with each frame.
  • the difference between the selected gamma voltage (ie, the data voltage) and the common electrode voltage satisfies the positive and negative polarities, thereby preventing or reducing the polarization of the liquid crystal, improving the RAS effect, and improving afterimage residual.
  • the exemplary embodiment also provides a liquid crystal display device including a display panel including data lines, gate lines, and pixels, the pixels being configured to be received in a polarity-by-frame inversion manner
  • the data voltage wherein the common electrode voltage has a first value when the pixel is written to the positive polarity, and the common electrode voltage has a second value when the pixel is written to the negative polarity, the first value being less than the second value.
  • the common electrode voltage has a first value when the pixel is written to the positive polarity
  • the common electrode voltage has a second value when the pixel is written to the negative polarity, the first value being less than the second value.
  • N in the Nth frame Frame N, the pixel can be written into the positive polarity, and the common electrode voltage can have a relatively small first value; in the N+1th frame Frame N+1, the pixel can be Writing a negative polarity, the common electrode voltage may have a relatively large second value; in the N+2 frame Frame N+2, the pixel may be written into the positive polarity, and the common electrode voltage may have a relatively small first value; In the N+3 frame Frame N+3, the pixel can be written to the negative polarity, the common electrode voltage can have a relatively large second value, and so on.
  • N may be an integer greater than one.
  • the liquid crystal display device may further include: a controller TCON that generates a first control signal when a pixel is written in a positive polarity, and generates a first when a pixel is written in a negative polarity a control signal, wherein the first control signal is a low voltage control signal, and the second control signal is a high voltage control signal; the gamma chip GAMMA IC generates a common electrode voltage Vcom having a first value in response to the first control signal 1. Generating a common electrode voltage Vcom 2 having a second value in response to the second control signal.
  • the gamma chip GAMMA IC may include a first bank BANK 1 and a second bank BANK 2.
  • the first bank BANK 1 may store the first code
  • the second bank BANK 2 may store the second code, the first code corresponding to the common electrode voltage Vcom1 having the first value, and the second code corresponding to having the second value The common electrode voltage Vcom 2 .
  • the gamma chip GAMMA IC may further include a bank selection terminal BANK_SEL (eg, a bank selection pin).
  • BANK_SEL bank selection terminal
  • the bank selection terminal BANK_SEL in the gamma chip GAMMA IC receives the first control signal, the first bank BANK 1 is selected to generate the common electrode voltage Vcom 1 having the first value; when the gamma chip is stored in the GAMMA IC
  • the body selection terminal BANK_SEL selects the second bank BANK 2 when receiving the second control signal, thereby generating the common electrode voltage Vcom 2 having the second value.
  • Vcom 1 can be 0.01V-1V smaller than Vcom 2.
  • Vcom 1 can be 0.02V-0.5V smaller than Vcom 2.
  • Vcom 1 can be 0.1V less than Vcom 2 .
  • the gamma chip GAMMA IC may generate a common electrode voltage, and the gamma chip GAMMA IC may be digitally adjustable.
  • the gamma chip GAMMA IC can store two different codes in the first bank BANK 1 and the second bank BANK 2, respectively, that is, the first bank BANK 1 can store the first code, and the second bank BANK2 can Store the second code. Two different codes set two different common electrode voltages.
  • the first code may correspond to a common electrode voltage Vcom1 having a first value
  • the second code may correspond to a common electrode voltage Vcom2 having a second value
  • Vcom1 may be 0.01V-1V smaller than Vcom2, preferably Vcom 1 can be 0.1V smaller than Vcom 2.
  • the common electrode voltage is changed slightly with each frame.
  • the difference between the selected gamma voltage (ie, the data voltage) and the common electrode voltage can mutually cancel the positive and negative polarities, thereby preventing or reducing the polarization of the liquid crystal, improving the RAS effect, and improving afterimage residual.
  • the common electrode voltage can be changed slightly with each frame, so that the driving voltage as a whole can satisfy the positive polarity of the previous frame as a whole.
  • the negative polarity of the next frame is too large, so that the positive and negative polarities can cancel each other, avoiding the problem of large positive polarity in the conventional liquid crystal display device, thereby preventing or reducing the polarization of the liquid crystal, and effectively improving the afterimage. Residual.
  • the above method according to the present invention can be implemented as a calculation in a computer readable recording medium Machine code.
  • the computer code can be implemented by those skilled in the art in accordance with the description of the above method.
  • the above method of the present invention is implemented when the computer code is executed in a computer.
  • each unit in the driving device of the liquid crystal panel may be implemented as a hardware component.
  • Those skilled in the art can implement the various units using, for example, a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), depending on the processing performed by the various defined units.
  • FPGA Field Programmable Gate Array
  • ASIC Application Specific Integrated Circuit

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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)
  • Power Engineering (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种用于改善余像残留的方法和使用该方法的液晶显示装置。所述方法包括：以极性逐帧反转的方式向像素提供数据电压，其中，当像素被写入正极性时，共电极电压具有第一值，当像素被写入负极性时，共电极电压具有第二值，第一值小于第二值。该用于改善余像残留的方法和使用该方法的液晶显示装置能够防止或减少液晶的极化，从而改善余像残留。

Description

用于改善余像残留的方法和使用该方法的液晶显示装置 技术领域
本发明属于液晶显示装置技术领域，更具体地说，涉及一种用于改善余像残留(image sticking)的方法和一种能够改善余像残留的液晶显示装置。
背景技术
液晶显示装置(LCD)具有体积小、重量轻、显示质量高等优点。液晶显示装置中的液晶面板所显示的画面由许多阵列排列的像素构成，每一个像素通常由分别显示各种颜色的子像素组成，每一个子像素所显示的亮度由液晶显示装置的背光模组的亮度和该液晶面板的子像素的灰阶共同决定。
随着液晶显示装置技术的发展，为了改善液晶显示装置的显示质量，人们提出了液晶面板的交变电压极性的驱动方法。即，电压的极性在连续帧时段之间极性反转，从而可以长时间地正常显示。然而，在使用这种驱动方法时，会出现液晶极化的现象，由此导致余像残留的问题。
发明内容
为克服现有技术的不足，本发明的示例性实施例提供了一种能够改善余像残留的方法和一种能够改善余像残留的液晶显示装置。
根据本发明的示例性实施例一方面，提供了一种用于改善余像残留的方法，所述方法包括：以极性逐帧反转的方式向像素提供数据电压，其中，当像素被写入正极性时，共电极电压具有第一值，当像素被写入负极性时，共电极电压具有第二值，第一值小于第二值。
根据本发明的示例性实施例，共电极电压可通过以下方式被确定：当像素被写入正极性时，产生第一控制信号，响应于第一控制信号产生具有第一值的共电极电压，其中，第一控制信号为低电压的控制信号；当像素被写入负极性时，产生第二控制信号，响应于第二控制信号产生具有第二值的共电极电压， 其中，第二控制信号为高电压的控制信号。
根据本发明的示例性实施例，响应于第一控制信号产生具有第一值的共电极电压的步骤包括：响应于第一控制信号选择第一代码，第一代码对应于具有第一值的共电极电压，从而产生具有第一值的共电极电压；响应于第二控制信号产生具有第二值的共电极电压的步骤包括：响应于第二控制信号选择第二代码，第二代码对应于具有第二值的共电极电压，从而产生具有第二值的共电极电压。
根据本发明的示例性实施例，第一值可以比第二值小0.01V-1V。
根据本发明的示例性实施例，第一值可以比第二值小0.1V。
根据本发明的示例性实施例的另一方面，提供了一种液晶显示装置，所述液晶显示装置包括显示面板，显示面板包括数据线、栅极线和像素，所述像素被配置为以极性逐帧反转的方式接收数据电压，其中，当像素被写入正极性时，共电极电压具有第一值，当像素被写入负极性时，共电极电压具有第二值，第一值小于第二值。
根据本发明的示例性实施例，所述液晶显示装置还可以包括：控制器，当像素被写入正极性时产生第一控制信号，当像素被写入负极性时产生第二控制信号，其中，第一控制信号为低电压的控制信号，第二控制信号为高电压的控制信号；伽马芯片，响应于第一控制信号产生具有第一值的共电极电压，响应于第二控制信号产生具有第二值的共电极电压。
根据本发明的示例性实施例，所述伽马芯片可以包括第一存储体和第二存储体，第一存储体存储第一代码且第二存储体存储第二代码，第一代码对应于具有第一值的共电极电压，第二代码对应于具有第二值的共电极电压。
根据本发明的示例性实施例，所述伽马芯片还可以包括存储体选择端子，其中，当存储体选择端子接收到第一控制信号时选择第一存储体，从而产生具有第一值的共电极电压，当存储体选择端子接收到第二控制信号时选择第二存储体，从而产生具有第二值的共电极电压。
根据本发明的示例性实施例，第一值可以比第二值小0.01V-1V。
根据本发明的示例性实施例，第一值可以比第二值小0.1V。
根据本发明的示例性实施例的用于改善余像残留的方法和使用该方法的液晶显示装置能够防止或减少液晶的极化，从而改善余像残留。
将在接下来的描述中部分阐述本发明另外的方面和/或优点，还有一部分通过描述将是清楚的，或者可以经过本发明的实施而得知。
附图说明
通过下面结合附图进行的对实施例的描述，本发明的上述和/或其它目的和优点将会变得更加清楚，在附图中：
图1是示出传统的液晶显示装置的驱动方法的示意性图示；
图2是示出根据本发明示例性实施例的用于改善余像残留的方法的示意性图示；
图3是示出根据本发明示例性实施例的用于改善余像残留的方法的示意性图示；
图4是示出根据本发明示例性实施例的用于改善余像残留的方法中的共电极电压随着每帧变换的示意性图示。
具体实施方式
以下，将参照附图更充分地描述本发明的示例性实施例，示例性实施例在附图中示出。然而，可以以许多不同的形式实施示例性实施例，并且不应被解释为局限于在此阐述的示例性实施例。相反，提供这些实施例从而本公开将会彻底和完整，并将完全地将示例性实施例的范围传达给本领域的技术人员。在附图中，为了清楚可能夸大了层和区域的大小和相对大小。同样的标号指示同样的元件。
应该理解，尽管在这里可使用术语第一、第二等来描述不同的组件，但是这些组件不应被这些术语所限制。这些术语仅用于区分一个组件与另一组件。例如，在不脱离示例实施例的范围的情况下，第一组件可被称为第二组件，类 似地，第二组件可被称为第一组件。
图1是示出传统的液晶显示装置的驱动方法的示意性图示。
参照图1，在传统的液晶显示装置中，可以采用共电极电压恒定且以若干帧(例如，一帧)为周期交变电压的极性的驱动方式。例如，在第N帧Frame N，像素可以被写入正极性，在第N+1帧Frame N+1，像素可以被写入负极性，在第N+2帧Frame N+2，像素可以被写入正极性，在第N+3帧Frame N+3，像素可以具有负极性，等等，并且共电极电压始终保持恒定。这里，N可以为大于1的整数。液晶的翻转取决于伽马电压(即，V0、V1、……、V255)和共电极电压之间的差值。理论上，共电极电压是V0和V255的平均值。但是，由于电容的耦合效应，共电极电压会比V0和V255的平均值小。此外，正负极性的电压实际上不会完全对称，通常正极性的绝对值会略高于负极性的绝对值。如此，经过较长时间之后，在正极性电压偏大的作用下，液晶会相应地发生极化，由此导致余像残留。
图2和图3是示出根据本发明示例性实施例的用于改善余像残留的方法的示意性图示。图4是示出根据本发明示例性实施例的用于改善余像残留的方法中的共电极电压随着每帧变换的示意性图示。
示例性实施例提供了一种用于改善余像残留的方法，所述方法包括：以极性逐帧反转的方式向像素提供数据电压，其中，当向像素写入正极性时，共电极电压具有第一值，当向像素写入负极性时，共电极电压具有第二值，第一值小于第二值。如图2所示，在第N帧Frame N，像素可以被写入正极性，共电极电压可以具有相对较小的第一值；在第N+1帧Frame N+1，像素可以被写入负极性，共电极电压可以具有相对较大的第二值；在第N+2帧Frame N+2，像素可以被写入正极性，共电极电压可以具有相对较小的第一值；在第N+3帧Frame N+3，像素可以被写入负极性，共电极电压可以具有相对较大的第二值，等等。这里，N可以为大于1的整数。通过改变共电极电压的值，可以使共电极电压随着每帧小幅度地变化，从而可以使驱动电压整体上满足前一帧正极性偏大且接下来的一帧负极性偏大，如此正负极性可以相互抵消，避免了传统的液晶显示装置中的正极性偏大的问题，从而防止或减少液晶的极化，由此，改善余像残留以提高显示质量。这里，向像素写入正极性指的是：向像素写入正 极性的像素电压；向像素写入负极性指的是：向像素写入负极性的像素电压；其中，像素电压为提供给像素的数据电压与共电极电压之差，当数据电压大于供电极电压时，二者之差为正极性的像素电压，而当数据电压小于供电极电压时，二者之差为负极性的像素电压。
根据本发明示例性实施例，共电极电压可以通过以下方式被确定：当像素被写入正极性时，产生第一控制信号，响应于第一控制信号产生具有第一值的共电极电压Vcom 1，其中，第一控制信号为低电压的控制信号；当像素被写入负极性时，产生第二控制信号，响应于第二控制信号产生具有第二值的共电极电压Vcom 2，其中，第二控制信号为高电压的控制信号。
如图3所示，控制器TCON可将随着每帧高低变换的控制信号输出到伽马芯片GAMMA IC，伽马芯片GAMMA IC可响应于该控制信号产生共电极电压。伽马芯片GAMMA IC可在第一存储体BANK 1中存储第一代码，并且可在第二存储体BANK 2中存储第二代码，第一代码对应于具有第一值的共电极电压Vcom 1，第二代码对应于具有第二值的共电极电压Vcom 2。
可选地，Vcom 1可以比Vcom 2小0.01V-1V。可选地，Vcom 1可以比Vcom 2小0.02V-0.5V。优选地，Vcom 1可以比Vcom 2小0.1V。
根据本发明的示例性实施例，响应于第一控制信号产生具有第一值的共电极电压Vcom 1的步骤可包括：响应于第一控制信号选择第一代码，第一代码对应于具有第一值的共电极电压Vcom 1，从而产生具有第一值的共电极电压Vcom 1；响应于第二控制信号产生具有第二值的共电极电压的步骤可包括：响应于第二控制信号选择第二代码，第二代码对应于具有第二值的共电极电压Vcom 2，从而产生具有第二值的共电极电压Vcom 2。
根据本发明的示例性实施例，控制器TCON可以输出随着每帧高低变换的控制信号，伽马芯片GAMMA IC可以接收从控制器TCON输出的控制信号并且响应于该控制信号产生随着每帧变换的共电极电压。当伽马芯片GAMMA IC中的存储体选择端子BANK_SEL(例如，存储体选择针脚)接收到具有低电压的第一控制信号时，选择第一存储体BANK 1，从而产生具有第一值的共电极电压Vcom 1；当伽马芯片GAMMA IC中的存储体选择端子BANK_SEL接收到具有高电压的第二控制信号时，选择第二存储体BANK 2，从而产生具有 第二值的共电极电压Vcom 2。
如图4所示，通过改变共电极电压的值，使得共电极电压随着每帧小幅度地变化。选择出的伽马电压(即数据电压)和共电极电压之间的差值可满足正负极性相互抵消，从而防止或减少液晶的极化，改善RAS效果并且改善余像残留。
示例性实施例还提供了一种液晶显示装置，所述液晶显示装置包括显示面板，显示面板包括数据线、栅极线和像素，所述像素被配置为以极性逐帧反转的方式接收数据电压，其中，当像素被写入正极性时，共电极电压具有第一值，当像素被写入负极性时，共电极电压具有第二值，第一值小于第二值。例如，如图2所示，在第N帧Frame N，像素可以被写入正极性，共电极电压可以具有相对较小的第一值；在第N+1帧Frame N+1，像素可以被写入负极性，共电极电压可以具有相对较大的第二值；在第N+2帧Frame N+2，像素可以被写入正极性，共电极电压可以具有相对较小的第一值；在第N+3帧Frame N+3，像素可以被写入负极性，共电极电压可以具有相对较大的第二值，等等。这里，N可以为大于1的整数。
如图3所示，根据本发明的示例性实施例的液晶显示装置还可以包括：控制器TCON，当像素被写入正极性时产生第一控制信号，当像素被写入负极性时产生第二控制信号，其中，第一控制信号为低电压的控制信号，第二控制信号为高电压的控制信号；伽马芯片GAMMA IC，响应于第一控制信号产生具有第一值的共电极电压Vcom 1，响应于第二控制信号产生具有第二值的共电极电压Vcom 2。
伽马芯片GAMMA IC可以包括第一存储体BANK 1和第二存储体BANK 2。第一存储体BANK 1可以存储第一代码，并且第二存储体BANK 2可以存储第二代码，第一代码对应于具有第一值的共电极电压Vcom 1，第二代码对应于具有第二值的共电极电压Vcom 2。
根据本发明的示例性实施例，伽马芯片GAMMA IC还可以包括存储体选择端子BANK_SEL(例如，存储体选择针脚)。当伽马芯片GAMMA IC中的存储体选择端子BANK_SEL接收到第一控制信号时选择第一存储体BANK 1，从而产生具有第一值的共电极电压Vcom 1；当伽马芯片GAMMA IC中的存储 体选择端子BANK_SEL接收到第二控制信号时选择第二存储体BANK 2，从而产生具有第二值的共电极电压Vcom 2。
可选地，Vcom 1可以比Vcom 2小0.01V-1V。可选地，Vcom 1可以比Vcom 2小0.02V-0.5V。优选地，Vcom 1可以比Vcom 2小0.1V。
更具体地讲，根据本发明的示例性实施例，伽马芯片GAMMA IC可以产生共电极电压，伽马芯片GAMMA IC可以是数字可调的。伽马芯片GAMMA IC可以分别在第一存储体BANK 1和第二存储体BANK 2中存储两个不同的代码，即，第一存储体BANK 1可以存储第一代码，并且第二存储体BANK2可以存储第二代码。两个不同的代码设置两个不同的共电极电压。第一代码可以对应于具有第一值的共电极电压Vcom 1，第二代码可以对应于具有第二值的共电极电压Vcom 2，其中，Vcom 1可以比Vcom 2小0.01V-1V，优选地，Vcom 1可以比Vcom 2小0.1V。当像素具有正极性时，控制器TCON输出第一控制信号给伽马芯片GAMMA IC中的存储体选择端子BANK_SEL，当像素具有负极性时，控制器TCON输出第二控制信号给伽马芯片GAMMA IC中的存储体选择端子BANK_SEL。当存储体选择端子BANK_SEL接收到具有低电压的第一控制信号时选择第一存储体BANK 1，从而产生具有第一值的共电极电压Vcom 1；当存储体选择端子BANK_SEL接收到具有高电压的第二控制信号时选择第二存储体BANK 2，从而产生具有第二值的共电极电压Vcom 2，由此使得共电极电压可以随着每帧在Vcom 1和Vcom 2之间变换。
如图4所示，通过改变共电极电压的值，使得共电极电压随着每帧小幅度地变化。选择出的伽马电压(即数据电压)和共电极电压之间的差值可以实现正负极性相互抵消，从而防止或减少液晶的极化，改善RAS效果并且改善余像残留。
根据本发明的示例性实施例的液晶显示装置，通过改变共电极电压的值，可以使共电极电压随着每帧小幅度地变化，从而可以使驱动电压整体上满足前一帧正极性偏大，接下来的一帧负极性偏大，如此正负极性可以相互抵消，避免了传统的液晶显示装置中的正极性偏大的问题，从而防止或减少液晶的极化，有效地改善余像残留。
此外，根据本发明的上述方法可以被实现为计算机可读记录介质中的计算 机代码。本领域技术人员可以根据对上述方法的描述来实现所述计算机代码。当所述计算机代码在计算机中被执行时实现本发明的上述方法。
此外，根据本发明的示例性实施例的液晶面板的驱动装置中的各个单元可被实现为硬件组件。本领域技术人员根据限定的各个单元所执行的处理，可以使用例如现场可编程门阵列(FPGA)或专用集成电路(ASIC)来实现各个单元。
本发明的以上实施例仅仅是示例性的，而本发明并不受限于此。本领域技术人员应该理解：在不脱离本发明的原理和精神的情况下，可对这些实施例进行改变，其中，本发明的范围在权利要求及其等同物中限定。

Claims (10)

  1. 一种用于改善余像残留的方法，其中，所述方法包括：以极性逐帧反转的方式向像素提供数据电压，其中，当像素被写入正极性时，共电极电压具有第一值，当像素被写入负极性时，共电极电压具有第二值，第一值小于第二值。
  2. 根据权利要求1所述的方法，其中，共电极电压通过以下方式被确定：
    当像素被写入正极性时，产生第一控制信号，响应于第一控制信号产生具有第一值的共电极电压，其中，第一控制信号为低电压的控制信号；
    当像素被写入负极性时，产生第二控制信号，响应于第二控制信号产生具有第二值的共电极电压，其中，第二控制信号为高电压的控制信号。
  3. 根据权利要求2所述的方法，其中，
    响应于第一控制信号产生具有第一值的共电极电压的步骤包括：响应于第一控制信号选择第一代码，第一代码对应于具有第一值的共电极电压，从而产生具有第一值的共电极电压；
    响应于第二控制信号产生具有第二值的共电极电压的步骤包括：响应于第二控制信号选择第二代码，第二代码对应于具有第二值的共电极电压，从而产生具有第二值的共电极电压。
  4. 根据权利要求1所述的方法，其中，第一值比第二值小0.01V-1V。
  5. 根据权利要求1所述的方法，其中，第一值比第二值小0.1V。
  6. 一种液晶显示装置，其中，所述液晶显示装置包括显示面板，显示面板包括数据线、栅极线和像素，所述像素被配置为以极性逐帧反转的方式接收数据电压，其中，当像素被写入正极性时，共电极电压具有第一值，当像素被写入负极性时，共电极电压具有第二值，第一值小于第二值。
  7. 根据权利要求6所述的液晶显示装置，其中，所述液晶显示装置还包括：
    控制器，当像素被写入正极性时产生第一控制信号，当像素被写入负极性时产生第二控制信号，其中，第一控制信号为低电压的控制信号，第二控制信号为高电压的控制信号；
    伽马芯片，响应于第一控制信号产生具有第一值的共电极电压，响应于第二控制信号产生具有第二值的共电极电压。
  8. 根据权利要求7所述的液晶显示装置，其中，所述伽马芯片包括第一存储体和第二存储体，第一存储体存储第一代码且第二存储体存储第二代码，第一代码对应于具有第一值的共电极电压，第二代码对应于具有第二值的共电极电压。
  9. 根据权利要求8所述的液晶显示装置，其中，所述伽马芯片还包括存储体选择端子，其中，当存储体选择端子接收到第一控制信号时选择第一存储体，从而产生具有第一值的共电极电压，当存储体选择端子接收到第二控制信号时选择第二存储体，从而产生具有第二值的共电极电压。
  10. 根据权利要求1所述的液晶显示装置，其中，第一值比第二值小0.01V-1V。
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