WO2017201811A1 - 一种液晶显示器的驱动方法及驱动装置 - Google Patents

一种液晶显示器的驱动方法及驱动装置 Download PDF

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Publication number
WO2017201811A1
WO2017201811A1 PCT/CN2016/087801 CN2016087801W WO2017201811A1 WO 2017201811 A1 WO2017201811 A1 WO 2017201811A1 CN 2016087801 W CN2016087801 W CN 2016087801W WO 2017201811 A1 WO2017201811 A1 WO 2017201811A1
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Prior art keywords
grayscale
difference threshold
driving
value
liquid crystal
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PCT/CN2016/087801
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English (en)
French (fr)
Inventor
曾德康
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US15/303,036 priority Critical patent/US10115368B2/en
Publication of WO2017201811A1 publication Critical patent/WO2017201811A1/zh
Anticipated expiration legal-status Critical
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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
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • 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
    • 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
    • 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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. 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
    • G09G3/3685—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
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0289—Details of voltage level shifters arranged for use in a driving circuit
    • 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
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to the field of driving circuit technologies, and in particular, to a driving method and a driving device for a liquid crystal display.
  • an overvoltage driving (Over) is usually used.
  • Driver, OD) technology Each stable state of the liquid crystal molecules corresponds to a certain voltage.
  • the driving voltage applied to the liquid crystal molecules is the corresponding voltage of the target state. Since the corresponding voltages of different gray scales are different, the angles at which the molecules need to be rotated are also different, which causes response time of different gray scale transitions. Everything varies.
  • the applied driving voltage is slightly higher than the corresponding voltage of the target state at the beginning, so that the liquid crystal molecules rotate faster, and when the target state is reached, the voltage falls back to the target.
  • the corresponding voltage of the state is maintained, which effectively shortens the reaction time and averages the response time of different grayscale switching.
  • the above overvoltage driving technology accelerates the reaction speed of the liquid crystal by applying an electric field intensity higher than that of the original steady state, so that the liquid crystal can be turned to a predetermined angle in a short time, so that the response time of the liquid crystal can be reduced to 8 ms or less.
  • the driving voltage is given 0V ⁇ 3V, the speed at which the liquid crystal molecules rotate is often not fast enough.
  • 0V ⁇ 4V can be given to increase the speed (assuming that 4V is the driving voltage of 150 steps), an overvoltage is required.
  • Driver lookup table Lookup Table, LUT
  • the 150th order overvoltage driving grayscale value can be obtained through the lookup table, and then the original 128th order is replaced by 150th order for overvoltage driving operation.
  • overvoltage driving technology In order to improve the response time of the liquid crystal panel, overvoltage driving technology is widely used.
  • the principle is to determine whether each pixel electrode needs to be driven by overvoltage by comparing the picture changes of the two frames before and after, mainly based on the gray-scale difference between the two frames of the front and back of each pixel electrode to determine whether the pixel electrode needs to be performed.
  • Overvoltage drive In practical applications, it is important to determine the grayscale difference threshold setting required for the overvoltage drive to start. If the grayscale difference threshold of the overvoltage drive start is set too small, the overvoltage drive may be accidentally started due to the jitter of the front end data input, causing the screen to be abnormal.
  • the grayscale difference threshold of the overvoltage driving start is set too large, some pixel electrodes that should be driven by overvoltage will not be driven by overvoltage, which will affect the response time.
  • the existing design is based on the actual picture performance of the pixel electrode to take a balance point between the excessively large and too small gray-scale difference thresholds, so that it is difficult to accurately determine whether the pixel electrode needs to be over-voltage-driven, such a prior art Defects need to be improved.
  • An object of the present invention is to provide a driving method and a driving device for a liquid crystal display, in order to solve the problem in the prior art, according to the gray-scale difference between two frames of the front and rear of each pixel electrode, whether it is necessary to perform over-voltage driving,
  • the setting of the grayscale difference threshold of the overvoltage driving of the pixel electrode is either too large or too small, and it is difficult to accurately determine whether the pixel electrode needs to be overvoltage driven.
  • a driving method of a liquid crystal display comprising the following steps:
  • the current grayscale value is a high grayscale, determining whether to perform overvoltage driving on the pixel electrode according to a preset first grayscale difference threshold;
  • the current grayscale value is a low grayscale
  • the determining, according to the preset first grayscale difference threshold, whether the pixel electrode is driven by an overvoltage specifically includes:
  • the overvoltage driving is initiated
  • the determining whether the over-voltage driving is performed on the pixel electrode according to the preset second gray-scale difference threshold includes:
  • the overvoltage driving is initiated.
  • the first grayscale difference value and the second grayscale difference value are absolute values of a difference between the current grayscale value and a grayscale value of a previous frame picture.
  • the gray scale of the high gray scale ranges from a positive integer of 128 to 255
  • the gray scale of the low gray scale ranges from a positive integer of 0 to 127.
  • the second gray level difference threshold is any positive integer between 4 and 6
  • the first gray level difference threshold is any positive integer between 0 and 3.
  • a driving method of a liquid crystal display comprising the following steps:
  • the current grayscale value is a high grayscale, determining whether to perform overvoltage driving on the pixel electrode according to a preset first grayscale difference threshold;
  • the current grayscale value is a low grayscale
  • determining whether to over-voltage driving the pixel electrode according to the preset first gray-scale difference threshold includes:
  • the overvoltage driving is initiated.
  • determining whether to over-voltage drive the pixel electrode according to the preset second gray-scale difference threshold includes:
  • the overvoltage driving is initiated.
  • the first grayscale difference value and the second grayscale difference value are absolute values of a difference between the current grayscale value and a grayscale value of a previous frame picture.
  • the gray scale of the high gray scale ranges from a positive integer of 128 to 255
  • the gray scale of the low gray scale ranges from a positive integer of 0 to 127.
  • the second gray level difference threshold is any positive integer between 4 and 6
  • the first gray level difference threshold is any positive integer between 0 and 3.
  • a driving device for a liquid crystal display comprising:
  • a grayscale value obtaining module configured to acquire a current grayscale value of a current frame picture of the pixel electrode when the liquid crystal display is driven;
  • a gray level determining module configured to determine a gray level of the current gray level value, where the gray level includes a high gray level and a low gray level;
  • a first driving module configured to: when the current grayscale value is a high grayscale, determine whether to overvoltage driving the pixel electrode according to a preset first grayscale difference threshold;
  • a second driving module configured to: when the current grayscale value is a low grayscale, determine whether to overvoltage driving the pixel electrode according to a preset second grayscale difference threshold, and the first gray The step threshold is less than the second gray level difference threshold.
  • the first driving module comprises:
  • a first acquiring unit configured to acquire a first grayscale difference between the current frame picture and the previous frame picture
  • a first determining unit configured to determine whether the first grayscale difference is greater than the first grayscale difference threshold
  • the first starting unit is configured to start overvoltage driving when the first grayscale difference is greater than the first grayscale difference threshold.
  • the second driving module comprises:
  • a second acquiring unit configured to acquire a second grayscale difference between the current frame picture and the previous frame picture
  • a second determining unit configured to determine whether the second grayscale difference is greater than the second grayscale difference threshold
  • the second starting unit is configured to start overvoltage driving when the second grayscale difference is greater than the second grayscale difference threshold.
  • the first grayscale difference value and the second grayscale difference value are absolute values of a difference between the current grayscale value and a grayscale value of a previous frame picture.
  • the gray scale of the high gray scale ranges from a positive integer of 128 to 255.
  • the gray scale of the low gray scale ranges from a positive integer of 0 to 127.
  • the second gray level difference threshold is any positive integer between 4 and 6.
  • the first gray level difference threshold is any positive integer between 0 and 3.
  • a driving method and a driving device for a liquid crystal display by first determining whether a grayscale value of a current frame picture of a pixel electrode is a high gray level or a low gray level, thereby obtaining a first gray of the current frame picture and the previous frame picture
  • the step value or the second gray level difference value is further determined according to the preset first gray level difference threshold or the second gray level difference threshold value, whether the pixel electrode is over-voltage driven, and whether the pixel electrode needs to be accurately determined
  • the voltage is driven, and there is no abnormal start of the overvoltage driving, which causes the screen to be abnormal and does not affect the response time of the pixel electrode.
  • FIG. 1 is a schematic flow chart showing an implementation process of a driving method of a liquid crystal display according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of an implementation process of determining whether to over-voltage driving the pixel electrode according to a preset first gray-scale difference threshold according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of an implementation process of determining whether to over-voltage driving the pixel electrode according to a preset second gray-scale difference threshold according to an embodiment of the present disclosure
  • FIG. 4 is a schematic overall structural diagram of a driving device of a liquid crystal display according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an entire structure of a first driving module according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an entire structure of a second driving module according to an embodiment of the present invention.
  • FIG. 1 is a schematic flow chart of a method for driving a liquid crystal display according to an embodiment of the present invention. As shown in FIG. 1, a driving method of a liquid crystal display according to the present invention includes the following steps:
  • Step S101 Acquire a current grayscale value of a current frame picture of the pixel electrode when the liquid crystal display is driven.
  • Step S102 Determine a grayscale level of the current grayscale value, where the grayscale level includes a high grayscale and a low grayscale.
  • Step S103 If the current grayscale value is a high grayscale, determine whether the pixel electrode is overvoltage driven according to a preset first grayscale difference threshold.
  • Step S104 If the current grayscale value is a low grayscale, determine whether the pixel electrode is overvoltage driven according to a preset second grayscale difference threshold, and the first grayscale difference threshold is smaller than the first The second gray level difference threshold.
  • FIG. 2 is a schematic diagram of an implementation process for determining whether to over-voltage driving the pixel electrode according to a preset first gray-scale difference threshold according to a preset embodiment. As shown in FIG. 2, if the current The grayscale value is a high grayscale, and determining whether to overdrive the pixel electrode according to the preset first grayscale difference threshold, specifically:
  • Step S201 Acquire a first grayscale difference value between the current frame picture and the previous frame picture.
  • Step S202 Determine whether the first grayscale difference value is greater than the first grayscale difference threshold.
  • Step S203 If the first grayscale difference is greater than the first grayscale difference threshold, the overvoltage driving is initiated.
  • FIG. 3 is a schematic diagram of an implementation process for determining whether to over-voltage driving the pixel electrode according to a preset second gray-scale difference threshold according to a preset embodiment. As shown in FIG. 3, if the current If the grayscale value is a low grayscale, determining whether to overvoltage driving the pixel electrode according to a preset second grayscale difference threshold, specifically:
  • Step S301 Acquire a second grayscale difference value between the current frame picture and the previous frame picture.
  • Step S302 Determine whether the second grayscale difference value is greater than the second grayscale difference threshold.
  • Step S303 If the second grayscale difference is greater than the second grayscale difference threshold, the overvoltage driving is started.
  • the first grayscale difference value and the second grayscale difference value are absolute values of a difference between the current grayscale value and a grayscale value of a previous frame picture.
  • the gray scale of the high gray scale ranges from a positive integer of 128 to 255, and the gray scale range of the low gray scale ranges from 0 to 127.
  • the second gray level difference threshold is any positive integer between 4 and 6
  • the first gray level difference threshold is any positive integer between 0 and 3.
  • the first grayscale difference threshold is set to be smaller than the second grayscale difference threshold, and the basis is that the human eye is more sensitive to the static performance of the low grayscale, so the grayscale difference threshold for the low grayscale can be set. Larger, to avoid the state of the static picture, the jitter of the front-end data input causes the over-voltage drive to be falsely activated, resulting in display abnormality.
  • the grayscale difference threshold for high grayscale can be set smaller to improve the overall response time of the system.
  • a method for driving a liquid crystal display by first determining whether a grayscale value of a current frame picture of a pixel electrode is a high gray level or a low gray level, thereby obtaining a first gray level difference between the current frame picture and the previous frame picture. Or the second grayscale difference value, and then determining whether to overvoltage driving the pixel electrode according to the preset first grayscale difference threshold or the second grayscale difference threshold, and accurately determining whether the pixel electrode needs to be overvoltage driven, There is no abnormal start of the overvoltage drive, which causes the screen to be abnormal and does not affect the response time of the pixel electrode.
  • FIG. 4 is a schematic diagram of the overall structure of a driving device for a liquid crystal display according to the embodiment of the present invention.
  • the driving device of the liquid crystal display of the present invention includes:
  • the grayscale value obtaining module 10 is configured to acquire a current grayscale value of a current frame picture of the pixel electrode when the liquid crystal display is driven;
  • the gray level determining module 20 is configured to determine a gray level of the current gray level value, where the gray level includes a high gray level and a low gray level;
  • the first driving module 30 is configured to: when the current grayscale value is a high grayscale, determine whether to overvoltage driving the pixel electrode according to a preset first grayscale difference threshold;
  • the second driving module 40 is configured to: when the current grayscale value is a low grayscale, determine whether to overvoltage driving the pixel electrode according to a preset second grayscale difference threshold, and the first The grayscale difference threshold is less than the second grayscale difference threshold.
  • FIG. 5 is a schematic structural view of the entire structure of the first driving module 30 of the present embodiment.
  • the first driving module 30 includes:
  • the first obtaining unit 301 is configured to acquire a first grayscale difference value between the current frame picture and the previous frame picture.
  • the first determining unit 302 is configured to determine whether the first grayscale difference is greater than the first grayscale difference threshold.
  • the first starting unit 303 is configured to start overvoltage driving when the first grayscale difference is greater than the first grayscale difference threshold.
  • FIG. 6 is a schematic diagram of the overall structure of the second driving module 40 of the present embodiment.
  • the second driving module 40 includes:
  • the second obtaining unit 401 is configured to acquire a second grayscale difference value between the current frame picture and the previous frame picture.
  • the second determining unit 402 is configured to determine whether the second grayscale difference is greater than the second grayscale difference threshold.
  • the second starting unit 403 is configured to start overvoltage driving when the second grayscale difference is greater than the second grayscale difference threshold.
  • the first grayscale difference value and the second grayscale difference value are absolute values of a difference between the current grayscale value and a grayscale value of a previous frame picture.
  • the driving device of the liquid crystal display of the present invention firstly determines whether the grayscale value of the current frame picture of the pixel electrode is a high gray level or a low gray level, thereby obtaining the first gray level difference between the current frame picture and the previous frame picture. Or the second grayscale difference value, and then determining whether to overvoltage driving the pixel electrode according to the preset first grayscale difference threshold or the second grayscale difference threshold, and accurately determining whether the pixel electrode needs to be overvoltage driven, There is no abnormal start of the overvoltage drive, which causes the screen to be abnormal and does not affect the response time of the pixel electrode.

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

Abstract

一种液晶显示器的驱动方法，包括以下步骤：在液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值（S101）；判断当前灰阶值的灰阶级别，灰阶级别包括高灰阶与低灰阶（S102）；若当前灰阶值为高灰阶，则根据预设的第一灰阶差阈值来判断是否对像素电极进行过电压驱动（S103）；若当前灰阶值为低灰阶，则根据预设的第二灰阶差阈值来判断是否对像素电极进行过电压驱动（S104）。该方法能够准确判断是否需要对像素电极进行过电压驱动，不会出现过电压驱动的误启动而造成画面异常，也不会影响像素电极的响应时间。

Description

一种液晶显示器的驱动方法及驱动装置 技术领域
本发明涉及驱动电路技术领域，特别涉及一种液晶显示器的驱动方法及驱动装置。
 背景技术
现有技术的液晶显示器中为解决残影现象，通常使用过电压驱动(Over Driver，OD)技术。液晶分子每一种稳定的状态都对应着一定的电压，当在电极上加电压时，液晶分子不是即时转动到目标状态，而是在一定的响应时间之后才能达到这个状态，电压越高，分子转动的速度越快。传统的液晶显示器中，在液晶分子上施加的驱动电压就是目标状态的对应电压，由于不同灰阶的对应电压不同，分子需要转过的角度也不同，这就造成了不同灰阶转换的响应时间千差万别。而在采用过电压驱动技术的液晶显示器中，施加的驱动电压在起始的时候稍高于目标状态的对应电压，使得液晶分子转动的速度更快，在到达目标状态时，电压再回落至目标状态的对应电压以保持状态，这样就有效缩短了反应时间，而且使不同灰阶切换的响应时间平均化。
上述过电压驱动技术通过施加高于原本稳态时所对应的电场强度，加快液晶的反应速度，使液晶能在较短时间内转到预定角度，使液晶的响应时间能够降低到8ms或更短。例如：将液晶分子从起始灰阶(如0阶)转换成目标灰阶(如128阶)，设0阶驱动电压为0V，128阶驱动电压为3V，当液晶显示器画面从0阶到128阶作转换时，若驱动电压给定0V→3V此时液晶分子转动的速度往往不够快，通常可以给0V→4V以增快速度(假定4V是150阶的驱动电压)，就需要一个过电压驱动查询表(Lookup Table，LUT)，使得从0阶转换到128阶时，可通过该查询表得到150阶的过电压驱动灰阶值，然后以150阶取代原本的128阶进行过电压驱动操作。
为提升液晶面板的响应时间，过电压驱动技术被广泛应用。其原理为通过对比前后两帧的画面变化，来判断每个像素电极是否需要进行过电压驱动，主要是根据每一个像素电极的前后两帧画面的灰阶差值去判断此像素电极是否需要进行过电压驱动。在实际应用中，判断过电压驱动启动所需灰阶差阈值设定非常重要。若过电压驱动启动的灰阶差阈值设定过小，会因为前端数据输入的抖动导致过电压驱动的误启动，造成画面异常。若过电压驱动启动的灰阶差阈值设定过大，会导致部分应该进行过电压驱动的像素电极没有进行过电压驱动，影响响应时间。现有设计是根据像素电极实际的画面表现在过大和过小的灰阶差阈值之中取平衡点，这样很难做到准确判断是否需要对像素电极进行过电压驱动，现有技术的这种缺陷亟待改善。
 技术问题
本发明的目的在于提供一种液晶显示器的驱动方法及驱动装置，以解决现有技术中，根据每一个像素电极的前后两帧画面的灰阶差值来判断是否需要进行过电压驱动时，对像素电极的过电压驱动启动的灰阶差阈值的设定，要么过大要么过小，很难做到准确判断是否需要对像素电极进行过电压驱动的问题。
 技术解决方案
本发明的技术方案如下：
一种液晶显示器的驱动方法，其包括以下步骤：
在所述液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值；
判断所述当前灰阶值的灰阶级别，所述灰阶级别包括高灰阶与低灰阶；
若所述当前灰阶值为高灰阶，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动；
若所述当前灰阶值为低灰阶，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，且所述第一灰阶差阈值小于第二灰阶差阈值；
其中根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
获取当前帧画面与上一帧画面的第一灰阶差值；
判断所述第一灰阶差值是否大于所述第一灰阶差阈值；
若所述第一灰阶差值大于第一灰阶差阈值，则启动过电压驱动；
其中根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
获取当前帧画面与上一帧画面的第二灰阶差值；
用于判断所述第二灰阶差值是否大于所述第二灰阶差阈值；
若所述第二灰阶差值大于第二灰阶差阈值，则启动过电压驱动。
优选地，其中所述第一灰阶差值及所述第二灰阶差值为所述当前灰阶值与其上一帧画面的灰阶值的差值的绝对值。
优选地，其中所述高灰阶的灰阶范围为128～255的正整数，所述低灰阶的灰阶范围为0～127的正整数。
优选地，其中所述第二灰阶差阈值为4～6之间的任一正整数，所述第一灰阶差阈值为0～3之间的任一正整数。
一种液晶显示器的驱动方法，其包括以下步骤：
在所述液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值；
判断所述当前灰阶值的灰阶级别，所述灰阶级别包括高灰阶与低灰阶；
若所述当前灰阶值为高灰阶，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动；
若所述当前灰阶值为低灰阶，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，且所述第一灰阶差阈值小于第二灰阶差阈值。
优选地，其中根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
获取当前帧画面与上一帧画面的第一灰阶差值；
判断所述第一灰阶差值是否大于所述第一灰阶差阈值；
若所述第一灰阶差值大于第一灰阶差阈值，则启动过电压驱动。
优选地，其中根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
获取当前帧画面与上一帧画面的第二灰阶差值；
用于判断所述第二灰阶差值是否大于所述第二灰阶差阈值；
若所述第二灰阶差值大于第二灰阶差阈值，则启动过电压驱动。
优选地，其中所述第一灰阶差值及所述第二灰阶差值为所述当前灰阶值与其上一帧画面的灰阶值的差值的绝对值。
优选地，其中所述高灰阶的灰阶范围为128～255的正整数，所述低灰阶的灰阶范围为0～127的正整数。
优选地，其中所述第二灰阶差阈值为4～6之间的任一正整数，所述第一灰阶差阈值为0～3之间的任一正整数。
一种液晶显示器的驱动装置，其包括：
灰阶值获取模块，用于在所述液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值；
灰阶判断模块，用于判断所述当前灰阶值的灰阶级别，所述灰阶级别包括高灰阶与低灰阶；
第一驱动模块，用于当所述当前灰阶值为高灰阶时，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动；
第二驱动模块，用于当所述当前灰阶值为低灰阶时，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，且所述第一灰阶差阈值小于第二灰阶差阈值。
优选地，其中所述第一驱动模块包括：
第一获取单元，用于获取当前帧画面与上一帧画面的第一灰阶差值；
第一判断单元，用于判断所述第一灰阶差值是否大于所述第一灰阶差阈值；
第一启动单元，用于当所述第一灰阶差值大于第一灰阶差阈值时，启动过电压驱动。
优选地，其中所述第二驱动模块包括：
第二获取单元，用于获取当前帧画面与上一帧画面的第二灰阶差值；
第二判断单元，用于判断所述第二灰阶差值是否大于所述第二灰阶差阈值；
第二启动单元，用于当所述第二灰阶差值大于第二灰阶差阈值时，启动过电压驱动。
优选地，其中所述第一灰阶差值及所述第二灰阶差值为所述当前灰阶值与其上一帧画面的灰阶值的差值的绝对值。
优选地，其中所述高灰阶的灰阶范围为128～255的正整数。
优选地，其中所述低灰阶的灰阶范围为0～127的正整数。
优选地，其中所述第二灰阶差阈值为4～6之间的任一正整数。
优选地，其中所述第一灰阶差阈值为0～3之间的任一正整数。
 有益效果
本发明的一种液晶显示器的驱动方法及驱动装置，通过先判断像素电极的当前帧画面的灰阶值为高灰阶还是低灰阶，进而获取当前帧画面与上一帧画面的第一灰阶差值或第二灰阶差值，再根据预设的第一灰阶差阈值或第二灰阶差阈值来判断是否对像素电极进行过电压驱动，能够准确判断是否需要对像素电极进行过电压驱动，不会出现过电压驱动的误启动而造成画面异常，也不会影响像素电极的响应时间。
 附图说明
图1为本发明实施例的一种液晶显示器的驱动方法的实施流程示意图；
图2为本发明实施例的根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动的实施流程示意图；
图3为本发明实施例的根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动的实施流程示意图；
图4为本发明实施例的一种液晶显示器的驱动装置的整体结构示意图；
图5为本发明实施例的第一驱动模块的整体结构框架示意图；
图6为本发明实施例的第二驱动模块的整体结构框架示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是以相同标号表示。
实施例一
请参考图1，图1为本实施例的一种液晶显示器的驱动方法的实施流程示意图，从图1可以看到，本发明的一种液晶显示器的驱动方法，包括以下步骤：
步骤S101：在所述液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值。
步骤S102：判断所述当前灰阶值的灰阶级别，所述灰阶级别包括高灰阶与低灰阶。
步骤S103：若所述当前灰阶值为高灰阶，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动。
步骤S104：若所述当前灰阶值为低灰阶，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，且所述第一灰阶差阈值小于第二灰阶差阈值。
请参考图2，图2为本实施例的根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动的实施流程示意图，从图2可以看到，若所述当前灰阶值为高灰阶，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
步骤S201：获取当前帧画面与上一帧画面的第一灰阶差值。
步骤S202：判断所述第一灰阶差值是否大于所述第一灰阶差阈值。
步骤S203：若所述第一灰阶差值大于第一灰阶差阈值，则启动过电压驱动。
请参考图3，图3为本实施例的根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动的实施流程示意图，从图3可以看到，若所述当前灰阶值为低灰阶，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
步骤S301：获取当前帧画面与上一帧画面的第二灰阶差值。
步骤S302：判断所述第二灰阶差值是否大于所述第二灰阶差阈值。
步骤S303：若所述第二灰阶差值大于第二灰阶差阈值，则启动过电压驱动。
在本实施例中，所述第一灰阶差值及所述第二灰阶差值为所述当前灰阶值与其上一帧画面的灰阶值的差值的绝对值。
在本实施例中，所述高灰阶的灰阶范围为128～255的正整数，所述低灰阶的灰阶范围为0～127的正整数。
在本实施例中，所述第二灰阶差阈值为4～6之间的任一正整数，所述第一灰阶差阈值为0～3之间的任一正整数。
本实施例设置所述第一灰阶差阈值小于所述第二灰阶差阈值，依据在于人眼对于低灰阶的静态表现会更敏感，所以针对低灰阶的灰阶差阈值可以设定的较大，以避免在静态画面的状态时，前端数据输入的抖动引起过电压驱动误启动，导致显示异常。而针对高灰阶的灰阶差阈值可以设定得比较小，以提高系统整体的响应时间。
本发明的一种液晶显示器的驱动方法，通过先判断像素电极的当前帧画面的灰阶值为高灰阶还是低灰阶，进而获取当前帧画面与上一帧画面的第一灰阶差值或第二灰阶差值，再根据预设的第一灰阶差阈值或第二灰阶差阈值来判断是否对像素电极进行过电压驱动，能够准确判断是否需要对像素电极进行过电压驱动，不会出现过电压驱动的误启动而造成画面异常，也不会影响像素电极的响应时间。
实施例二
请参考图4，图4为本实施例的一种液晶显示器的驱动装置的整体结构示意图，从图4可以看到，本发明的一种液晶显示器的驱动装置，包括：
灰阶值获取模块10，用于在所述液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值；
灰阶判断模块20，用于判断所述当前灰阶值的灰阶级别，所述灰阶级别包括高灰阶与低灰阶；
第一驱动模块30，用于当所述当前灰阶值为高灰阶时，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动；
第二驱动模块40，用于当所述当前灰阶值为低灰阶时，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，且所述第一灰阶差阈值小于第二灰阶差阈值。
如图5所示，图5为本实施例的第一驱动模块30的整体结构框架示意图，从图5可以看到，在本实施例中，所述第一驱动模块30包括：
第一获取单元301，用于获取当前帧画面与上一帧画面的第一灰阶差值。
第一判断单元302，用于判断所述第一灰阶差值是否大于所述第一灰阶差阈值。
第一启动单元303，用于当所述第一灰阶差值大于第一灰阶差阈值时，启动过电压驱动。
如图6所示，图6为本实施例的第二驱动模块40的整体结构框架示意图，从图6可以看到，在本实施例中，所述第二驱动模块40包括：
第二获取单元401，用于获取当前帧画面与上一帧画面的第二灰阶差值。
第二判断单元402，用于判断所述第二灰阶差值是否大于所述第二灰阶差阈值。
第二启动单元403，用于当所述第二灰阶差值大于第二灰阶差阈值时，启动过电压驱动。
在本实施例中，所述第一灰阶差值及所述第二灰阶差值为所述当前灰阶值与其上一帧画面的灰阶值的差值的绝对值。
本发明的一种液晶显示器的驱动装置，通过先判断像素电极的当前帧画面的灰阶值为高灰阶还是低灰阶，进而获取当前帧画面与上一帧画面的第一灰阶差值或第二灰阶差值，再根据预设的第一灰阶差阈值或第二灰阶差阈值来判断是否对像素电极进行过电压驱动，能够准确判断是否需要对像素电极进行过电压驱动，不会出现过电压驱动的误启动而造成画面异常，也不会影响像素电极的响应时间。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (18)

  1. 一种液晶显示器的驱动方法，其包括以下步骤：
    在所述液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值；
    判断所述当前灰阶值的灰阶级别，所述灰阶级别包括高灰阶与低灰阶；
    若所述当前灰阶值为高灰阶，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动；
    若所述当前灰阶值为低灰阶，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，且所述第一灰阶差阈值小于第二灰阶差阈值；
    其中根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
    获取当前帧画面与上一帧画面的第一灰阶差值；
    判断所述第一灰阶差值是否大于所述第一灰阶差阈值；
    若所述第一灰阶差值大于第一灰阶差阈值，则启动过电压驱动；
    其中根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
    获取当前帧画面与上一帧画面的第二灰阶差值；
    用于判断所述第二灰阶差值是否大于所述第二灰阶差阈值；
    若所述第二灰阶差值大于第二灰阶差阈值，则启动过电压驱动。
  2. 根据权利要求1所述的液晶显示器的驱动方法，其中所述第一灰阶差值及所述第二灰阶差值为所述当前灰阶值与其上一帧画面的灰阶值的差值的绝对值。
  3. 根据权利要求1所述的液晶显示器的驱动方法，其中所述高灰阶的灰阶范围为128～255的正整数，所述低灰阶的灰阶范围为0～127的正整数。
  4. 根据权利要求1所述的液晶显示器的驱动方法，其中所述第二灰阶差阈值为4～6之间的任一正整数，所述第一灰阶差阈值为0～3之间的任一正整数。
  5. 一种液晶显示器的驱动方法，其包括以下步骤：
    在所述液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值；
    判断所述当前灰阶值的灰阶级别，所述灰阶级别包括高灰阶与低灰阶；
    若所述当前灰阶值为高灰阶，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动；
    若所述当前灰阶值为低灰阶，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，且所述第一灰阶差阈值小于第二灰阶差阈值。
  6. 根据权利要求5所述的液晶显示器的驱动方法，其中根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
    获取当前帧画面与上一帧画面的第一灰阶差值；
    判断所述第一灰阶差值是否大于所述第一灰阶差阈值；
    若所述第一灰阶差值大于第一灰阶差阈值，则启动过电压驱动。
  7. 根据权利要求5所述的液晶显示器的驱动方法，其中根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，具体包括：
    获取当前帧画面与上一帧画面的第二灰阶差值；
    用于判断所述第二灰阶差值是否大于所述第二灰阶差阈值；
    若所述第二灰阶差值大于第二灰阶差阈值，则启动过电压驱动。
  8. 根据权利要求5所述的液晶显示器的驱动方法，其中所述第一灰阶差值及所述第二灰阶差值为所述当前灰阶值与其上一帧画面的灰阶值的差值的绝对值。
  9. 根据权利要求5所述的液晶显示器的驱动方法，其中所述高灰阶的灰阶范围为128～255的正整数，所述低灰阶的灰阶范围为0～127的正整数。
  10. 根据权利要求5所述的液晶显示器的驱动方法，其中所述第二灰阶差阈值为4～6之间的任一正整数，所述第一灰阶差阈值为0～3之间的任一正整数。
  11. 一种液晶显示器的驱动装置，其包括：
    灰阶值获取模块，用于在所述液晶显示器进行驱动时，获取像素电极当前帧画面的当前灰阶值；
    灰阶判断模块，用于判断所述当前灰阶值的灰阶级别，所述灰阶级别包括高灰阶与低灰阶；
    第一驱动模块，用于当所述当前灰阶值为高灰阶时，则根据预设的第一灰阶差阈值来判断是否对所述像素电极进行过电压驱动；
    第二驱动模块，用于当所述当前灰阶值为低灰阶时，则根据预设的第二灰阶差阈值来判断是否对所述像素电极进行过电压驱动，且所述第一灰阶差阈值小于第二灰阶差阈值。
  12. 根据权利要求11所述的液晶显示器的驱动装置，其中所述第一驱动模块包括：
    第一获取单元，用于获取当前帧画面与上一帧画面的第一灰阶差值；
    第一判断单元，用于判断所述第一灰阶差值是否大于所述第一灰阶差阈值；
    第一启动单元，用于当所述第一灰阶差值大于第一灰阶差阈值时，启动过电压驱动。
  13. 根据权利要求11所述的液晶显示器的驱动装置，其中所述第二驱动模块包括：
    第二获取单元，用于获取当前帧画面与上一帧画面的第二灰阶差值；
    第二判断单元，用于判断所述第二灰阶差值是否大于所述第二灰阶差阈值；
    第二启动单元，用于当所述第二灰阶差值大于第二灰阶差阈值时，启动过电压驱动。
  14. 根据权利要求11所述的液晶显示器的驱动装置，其中所述第一灰阶差值及所述第二灰阶差值为所述当前灰阶值与其上一帧画面的灰阶值的差值的绝对值。
  15. 根据权利要求11所述的液晶显示器的驱动装置，其中所述高灰阶的灰阶范围为128～255的正整数。
  16. 根据权利要求11所述的液晶显示器的驱动装置，其中所述低灰阶的灰阶范围为0～127的正整数。
  17. 根据权利要求11所述的液晶显示器的驱动装置，其中所述第二灰阶差阈值为4～6之间的任一正整数。
  18. 根据权利要求11所述的液晶显示器的驱动装置，其中所述第一灰阶差阈值为0～3之间的任一正整数。
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