WO2018000599A1 - 灰阶亮度控制方法和装置 - Google Patents

灰阶亮度控制方法和装置 Download PDF

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Publication number
WO2018000599A1
WO2018000599A1 PCT/CN2016/099544 CN2016099544W WO2018000599A1 WO 2018000599 A1 WO2018000599 A1 WO 2018000599A1 CN 2016099544 W CN2016099544 W CN 2016099544W WO 2018000599 A1 WO2018000599 A1 WO 2018000599A1
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WIPO (PCT)
Prior art keywords
reference voltage
brightness control
charging
liquid crystal
gray scale
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Ceased
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PCT/CN2016/099544
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English (en)
French (fr)
Inventor
徐枫程
郭东胜
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 US15/311,509 priority Critical patent/US20180182331A1/en
Publication of WO2018000599A1 publication Critical patent/WO2018000599A1/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
    • G09G3/3648—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
    • G09G3/3607—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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • 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
    • 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
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • 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
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • 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
    • G09G2310/06—Details of flat display driving waveforms
    • 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
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/066—Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the invention belongs to the technical field of liquid crystal displays, and more particularly to a gray scale brightness control method and device.
  • the P-Gamma IC is required to generate a reference voltage and supply it to the R-string inside the source driver, and the voltage-divided voltage values are generated by resistor division ( For example, V1, V2, V3), the pixel voltage digital signal is input to the source drive, and the corresponding gray scale voltage to be output is selected by the DAC according to the decoded pixel voltage digital signal.
  • resistor division For example, V1, V2, V3
  • the charging waveform is as shown in FIG. 2, t1 is the charging time, and V1, V2, and V3 represent different gray scale voltages.
  • the pixel By outputting different gray scale voltages, the pixel exhibits different gray scale brightness effects.
  • an exemplary embodiment of the present invention provides a gray scale brightness control device with low hardware complexity.
  • an aspect of the present invention provides a gray scale brightness control apparatus, wherein the gray scale brightness control apparatus includes: a reference voltage generation unit that outputs a reference voltage; and a liquid crystal capacitance charging unit that receives from a reference voltage generation unit The reference voltage generates a charging waveform based on the received reference voltage according to a predetermined grayscale brightness of the pixels of the liquid crystal panel, and charges the liquid crystal capacitance of the pixel using the generated charging waveform for a predetermined period of time.
  • the liquid crystal capacitor charging unit comprises: a charging waveform generating unit, which is composed of a digital programmable capacitor and a resistor, wherein the digital programmable capacitor and the resistor constitute an RC integrating circuit, and receive The reference voltage is an input of the RC integrating circuit, and the charging waveform is an output of the RC integrating circuit; the digital signal generating unit determines the digital signal according to the predetermined grayscale brightness, and outputs the determined digital signal to the digital programmable capacitor, The digital programmable capacitor outputs a capacitance value corresponding to the digital signal.
  • a charging waveform generating unit which is composed of a digital programmable capacitor and a resistor, wherein the digital programmable capacitor and the resistor constitute an RC integrating circuit, and receive The reference voltage is an input of the RC integrating circuit, and the charging waveform is an output of the RC integrating circuit; the digital signal generating unit determines the digital signal according to the predetermined grayscale brightness, and outputs the determined digital signal to the digital programmable
  • the generated charging waveform is a ramp wave.
  • the slope of the ramp portion of the ramp wave corresponds to the capacitance value of the digitally programmable capacitor.
  • the greater the slope of the climb portion of the ramp wave the higher the gray scale brightness of the pixel.
  • gray scale brightness control device of the liquid crystal panel provided by the exemplary embodiment of the present invention, hardware complexity can be reduced to save cost while the pixels of the liquid crystal panel have different gray scale brightness.
  • FIG. 1 is a block diagram showing a gray scale brightness control device in the prior art
  • FIG. 2 is a view showing a charging waveform generated by a gray scale brightness control device in the related art
  • FIG. 3 is a block diagram showing a gray scale brightness control device according to an exemplary embodiment of the present invention.
  • FIG. 4 is a block diagram showing a liquid crystal capacitor charging unit according to an exemplary embodiment of the present invention.
  • FIG. 5 is a block diagram showing a charging waveform generating unit according to an exemplary embodiment of the present invention.
  • FIG. 6 is a diagram showing a charging warranty generated by a grayscale brightness control device according to an exemplary embodiment of the present invention.
  • FIG. 7 is a flowchart illustrating a gray scale brightness control method according to an exemplary embodiment of the present invention.
  • FIG. 3 is a block diagram illustrating a gray scale brightness control device 100 according to an exemplary embodiment.
  • the gray scale brightness control device 100 includes a reference voltage generating unit 110 and a liquid crystal capacitor charging unit 120.
  • the reference voltage generating unit 110 is for outputting a reference voltage.
  • the liquid crystal capacitor charging unit 120 is configured to receive a reference voltage from the reference voltage generating unit 110, generate a charging waveform based on the received reference voltage according to a predetermined grayscale brightness of the pixels of the liquid crystal panel, and use the generated charging waveform pair for a predetermined period of time.
  • the liquid crystal capacitor of the pixel is charged.
  • FIG. 4 is a block diagram illustrating a liquid crystal capacitor charging unit 120 according to an exemplary embodiment.
  • the liquid crystal capacitor charging unit 120 includes a charging waveform generating unit 121 and a digital signal generating unit 122.
  • the charge waveform generating unit 121 is composed of a digital programmable capacitor and a resistor.
  • the digital programmable capacitor and resistor form an RC integration circuit, and the received reference voltage is the input of the RC integration circuit, and the charging waveform is the output of the RC integration circuit.
  • the digital signal generating unit 122 is configured to determine the digital signal according to the predetermined grayscale brightness, and output the determined digital signal to the digital programmable capacitor, so that the digital programmable capacitor outputs a capacitance value corresponding to the digital signal.
  • the generated charging waveform is a ramp wave.
  • a ramp wave is a waveform having a climb portion and a stable portion.
  • the slope of the climb portion of the ramp wave corresponds to the capacitance value of the digitally programmable capacitor. That is, the slope of the climb portion of the ramp changes as the capacitance of the digitally programmable capacitor changes.
  • FIG. 5 is a block diagram illustrating a charging waveform generation unit 121 according to an exemplary embodiment.
  • the digital signal is input to the digitally programmable capacitor Cx such that the digitally programmable capacitor Cx outputs a corresponding capacitance value C.
  • the resistor R and the digitally programmable capacitor Cx constitute an RC integrating circuit.
  • Vin is an input terminal of the RC circuit, and receives a reference voltage from the reference voltage generating unit 110.
  • Vout is the output of the RC circuit, and its output is the charging waveform of the liquid crystal capacitor for the pixel.
  • the waveform changes after the reference voltage passes through the RC integration circuit.
  • the capacitance value C of the digitally programmable capacitor Cx is different according to the digital signal, and the ramp-up time of the voltage is different, the output charging waveform is also different.
  • the capacitance value of the digitally programmable capacitor Cx is controlled to control the climb state, that is, the charging voltage of the liquid crystal capacitor for the pixel can be controlled to achieve the effect of different gray scale voltage output.
  • the order of the grayscale brightness of the pixel is the highest when the charging voltage is V1, and the second time when the charging voltage is V2. The lowest when the charging voltage is V3.
  • the voltage of the stable portion is the reference voltage in the charging waveforms V1, V2, and V3
  • the slope of the climbing portion of the charging waveform V1 is the highest
  • the slope of the climbing portion of the charging waveform V2 is second
  • the climbing waveform V3 is climbed.
  • the partial slope is the lowest.
  • the order of the grayscale brightness of the pixel is highest when the charging waveform is V1, the second when the charging waveform is V2, and the highest when the charging waveform is V3.
  • FIG. 7 is a flowchart illustrating a gray scale brightness control method according to an exemplary embodiment of the present invention.
  • step S110 a charging waveform is generated based on the reference voltage according to a predetermined grayscale luminance of a pixel of the liquid crystal panel.
  • an RC integration circuit is used to generate a charging waveform.
  • the RC integration circuit is composed of a digital programmable capacitor and a resistor.
  • the input of the RC integration circuit is a reference voltage, and the output of the RC integration circuit is a charging waveform.
  • a digital signal is determined based on the predetermined grayscale luminance, and a capacitance value of the digital programmable capacitor in the RC integration circuit is controlled based on the determined digital signal.
  • step S120 the liquid crystal capacitance of the pixel is charged using the generated charging waveform for a predetermined period of time.
  • the generated charging waveform is a ramp wave.
  • the slope of the ramp portion of the ramp wave corresponds to the capacitance value of the digitally programmable capacitor.
  • the greater the slope of the climb portion of the ramp wave the higher the gray scale brightness of the pixel.

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

Abstract

一种灰阶亮度控制方法和装置。所述灰阶亮度控制装置包括：参考电压产生单元(110)，输出参考电压；液晶电容充电单元(120)，从参考电压产生单元(110)接收参考电压，根据液晶面板的像素的预定的灰阶亮度来基于接收的参考电压产生充电波形(S110)，并在预定时间段内使用产生的充电波形对所述像素的液晶电容进行充电(S120)，能够降低硬件复杂度以节约成本。

Description

灰阶亮度控制方法和装置 技术领域
本发明属于液晶显示器技术领域，更具体地说，涉及一种灰阶亮度控制方法和装置。
背景技术
如图1所示，在现有的灰阶亮度控制方案中，需要P-Gamma IC产生参考电压并将其提供给源极驱动内部的R-string，经过电阻分压产生各灰阶电压值(如V1、V2、V3)，像素电压数字信号被输入给源极驱动，根据解码后的像素电压数字信号来通过DAC选择对应的需要输出的灰阶电压。
当使用输出的灰阶电压给像素的液晶电容充电时，充电波形如图2所示，t1为充电时间，V1、V2、V3代表不同的灰阶电压。通过输出不同的灰阶电压，达到像素显示出不同灰阶亮度的效果。
按照现有的灰阶亮度控制方案，需要多个模块来完成灰阶电压的输出，硬件复杂度较高，不利于降低生产成本。
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一种硬件复杂度较低的灰阶亮度控制装置。
根据本发明的示例性实施例一方面提供一种灰阶亮度控制装置，其中，所述灰阶亮度控制装置包括：参考电压产生单元，输出参考电压；液晶电容充电单元，从参考电压产生单元接收参考电压，根据液晶面板的像素的预定的灰阶亮度来基于接收的参考电压产生充电波形，并在预定时间段内使用产生的充电波形对所述像素的液晶电容进行充电。
可选地，液晶电容充电单元包括：充电波形产生单元，由数字可编程电容器和电阻器组成，其中，数字可编程电容器和电阻器构成RC积分电路，接收 的参考电压为RC积分电路的输入，充电波形为RC积分电路的输出；数字信号产生单元，根据所述预定的灰阶亮度来确定数字信号，并将确定的数字信号输出到数字可编程电容器，以使数字可编程电容器输出与数字信号对应的电容值。
可选地，产生的充电波形为斜波。
可选地，斜波的爬升部分的斜率与数字可编程电容器的电容值相应。
可选地，斜波的爬升部分的斜率越大，所述像素的灰阶亮度越高。
根据本发明的示例性实施例提供的液晶面板的灰阶亮度控制装置，能够在使液晶面板的像素具有不同的灰阶亮度的同时，降低硬件复杂度以节约成本。
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，其中：
图1是示出现有技术中的灰阶亮度控制装置的框图；
图2是示出现有技术中的灰阶亮度控制装置所产生的充电波形的示图；
图3是示出根据本发明示例性实施例的灰阶亮度控制装置的框图；
图4是示出根据本发明示例性实施例的液晶电容充电单元的框图；
图5是示出根据本发明示例性实施例的充电波形产生单元的框图；
图6是示出根据本发明示例性实施例的灰阶亮度控制装置所产生的充电保修的示图；
图7是示出根据本发明示例性实施例的灰阶亮度控制方法的流程图。
具体实施方式
现将详细描述本发明的示例性实施例，所述实施例的示例在附图中示出，其中，相同的标号指示相同的部分。以下将通过参照附图来说明所述实施例，以便解释本发明。
图3是示出根据示例性实施例的灰阶亮度控制装置100的框图。
灰阶亮度控制装置100包括参考电压产生单元110和液晶电容充电单元120。
参考电压产生单元110用于输出参考电压。
液晶电容充电单元120用于从参考电压产生单元110接收参考电压，根据液晶面板的像素的预定的灰阶亮度来基于接收的参考电压产生充电波形，并在预定时间段内使用产生的充电波形对所述像素的液晶电容进行充电。
图4是示出根据示例性实施例的液晶电容充电单元120的框图。
液晶电容充电单元120包括充电波形产生单元121和数字信号产生单元122。
充电波形产生单元121由数字可编程电容器和电阻器组成。数字可编程电容器和电阻器构成RC积分电路，接收的参考电压为RC积分电路的输入，充电波形为RC积分电路的输出。
数字信号产生单元122用于根据所述预定的灰阶亮度来确定数字信号，并将确定的数字信号输出到数字可编程电容器，以使数字可编程电容器输出与数字信号对应的电容值。
作为示例，产生的充电波形为斜波。斜波是指具有由爬升部分和稳定部分组成的波形。
作为示例，斜波的爬升部分的斜率与数字可编程电容器的电容值相应。也就是说，斜波的爬升部分的斜率随着数字可编程电容器的电容值的变化而发生改变。
作为示例，斜波的爬升部分的斜率越大，所述像素的灰阶亮度越高。
图5是示出根据示例性实施例的充电波形产生单元121的框图。
数字信号被输入到数字可编程电容器Cx，以使数字可编程电容器Cx输出对应的电容值C。电阻器R与数字可编程电容器Cx构成RC积分电路。Vin为RC电路的输入端，从参考电压产生单元110接收参考电压。Vout为RC电路的输出端，其输出为针对像素的液晶电容的充电波形。
参考电压经过RC积分电路后波形发生变化。当数字可编程电容器Cx的电容值C根据数字信号而不同时，电压的爬升时间不同，则输出的充电波形也不同。
如图6所示，在充电时间t1的前段，由于电容电压不能突变，在爬升的过程中，充电电压逐渐上升。在充电波形的稳定部分的电压相同的情况下，控制数字可编程电容器Cx的电容值以控制爬升的状态，即可以控制针对像素的液晶电容的充电电压，达到不同的灰阶电压输出的效果。
例如，如图2所示，在使用充电电压V1、V2、V3对像素的液晶电容进行充电的情况下，像素的灰阶亮度的排序为充电电压为V1时最高，充电电压为V2时其次，充电电压为V3时最低。
如图6所示，虽然在充电波形V1、V2、V3中，稳定部分的电压均为参考电压，但充电波形V1的爬升部分斜率最高，充电波形V2的爬升部分斜率其次，充电波形V3的爬升部分斜率最低，在这种情况下，像素的灰阶亮度的排序为当充电波形为V1时最高，充电波形为V2时其次，充电波形为V3时最高。
图7是示出根据本发明示例性实施例的灰阶亮度控制方法的流程图。
在步骤S110，根据液晶面板的像素的预定的灰阶亮度来基于参考电压产生充电波形。
作为示例，使用RC积分电路来产生充电波形。RC积分电路由数字可编程电容器和电阻器构成，RC积分电路的输入为参考电压，RC积分电路的输出为充电波形。根据所述预定的灰阶亮度来确定数字信号，并基于确定的数字信号来控制RC积分电路中的数字可编程电容器的电容值。
在步骤S120，在预定时间段内使用产生的充电波形对所述像素的液晶电容进行充电。
可选地，产生的充电波形为斜波。
可选地，斜波的爬升部分的斜率与数字可编程电容器的电容值相应。
可选地，斜波的爬升部分的斜率越大，所述像素的灰阶亮度越高。
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. 一种灰阶亮度控制装置，其中，所述灰阶亮度控制装置包括：
    参考电压产生单元，输出参考电压；
    液晶电容充电单元，从参考电压产生单元接收参考电压，根据液晶面板的像素的预定的灰阶亮度来基于接收的参考电压产生充电波形，并在预定时间段内使用产生的充电波形对所述像素的液晶电容进行充电。
  2. 根据权利要求1所述的灰阶亮度控制装置，其中，液晶电容充电单元包括：
    充电波形产生单元，由数字可编程电容器和电阻器组成，其中，数字可编程电容器和电阻器构成RC积分电路，RC积分电路的输入为参考电压，RC积分电路的输出为充电波形；
    数字信号产生单元，根据所述预定的灰阶亮度来确定数字信号，并将确定的数字信号输出到数字可编程电容器，以使数字可编程电容器输出与数字信号对应的电容值。
  3. 根据权利要求1所述的灰阶亮度控制装置，其中，产生的充电波形为斜波。
  4. 根据权利要求3所述的灰阶亮度控制装置，其中，斜波的爬升部分的斜率与数字可编程电容器的电容值相应。
  5. 根据权利要求3所述的灰阶亮度控制装置，其中，斜波的爬升部分的斜率越大，所述像素的灰阶亮度越高。
  6. 一种灰阶亮度控制方法，其中，所述灰阶亮度控制方法包括：
    根据液晶面板的像素的预定的灰阶亮度来基于参考电压产生充电波形；
    在预定时间段内使用产生的充电波形对所述像素的液晶电容进行充电。
  7. 根据权利要求6所述的灰阶亮度控制方法，其中，所述基于参考电压产生充电波形的步骤包括：
    使用RC积分电路来产生充电波形，
    其中，RC积分电路由数字可编程电容器和电阻器构成，RC积分电路的输入为参考电压，RC积分电路的输出为充电波形，
    其中，根据所述预定的灰阶亮度来确定数字信号，并基于确定的数字信号来控制RC积分电路中的数字可编程电容器的电容值。
  8. 根据权利要求6所述的灰阶亮度控制方法，其中，产生的充电波形为斜波。
  9. 根据权利要求8所述的灰阶亮度控制方法，其中，斜波的爬升部分的斜率与数字可编程电容器的电容值相应。
  10. 根据权利要求8所述的灰阶亮度控制方法，其中，斜波的爬升部分的斜率越大，所述像素的灰阶亮度越高。
PCT/CN2016/099544 2016-06-30 2016-09-21 灰阶亮度控制方法和装置 Ceased WO2018000599A1 (zh)

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