WO2018040165A1 - 液晶显示器画面闪烁现象控制电路 - Google Patents

液晶显示器画面闪烁现象控制电路 Download PDF

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Publication number
WO2018040165A1
WO2018040165A1 PCT/CN2016/100450 CN2016100450W WO2018040165A1 WO 2018040165 A1 WO2018040165 A1 WO 2018040165A1 CN 2016100450 W CN2016100450 W CN 2016100450W WO 2018040165 A1 WO2018040165 A1 WO 2018040165A1
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Prior art keywords
capacitor
voltage
resistor
liquid crystal
crystal display
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PCT/CN2016/100450
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English (en)
French (fr)
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李文芳
张先明
陈辛洪
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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 US15/312,629 priority Critical patent/US10319330B2/en
Publication of WO2018040165A1 publication Critical patent/WO2018040165A1/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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is DC
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a liquid crystal display screen flicker phenomenon control circuit.
  • VCOM R2/(R1+R2)*[VAA1-VAA2*R1*(n+1)/2560*Rset],
  • VAA2 represents the operating voltage of the Pgamma IC, which is provided by an external power supply module
  • VAA1 represents the partial voltage of the common voltage VCOM generated by the Pgamma IC, which is also provided by an external power supply module
  • V gamma is generated by the Pgamma IC
  • a gamma reference voltage which is typically provided to the data driver of the display panel
  • VCOM is the common voltage generated by the Pgamma IC that is provided to the common electrode of the display panel.
  • VAA1 and VAA2 have different uses, but the voltage values are the same, which are provided by the same external power supply module.
  • Equation 1 Since the control range of VAA1 and VAA2 is 15.3+/-0.3V and the deviation of 0.6V, the common voltage VCOM is greatly affected by VAA1 and VAA2, and the phenomenon of liquid crystal display flickering is serious.
  • a liquid crystal display screen flicker phenomenon control circuit capable of reducing the flickering phenomenon of a liquid crystal display and optimizing the display effect of the liquid crystal display is provided.
  • a liquid crystal display screen flicker phenomenon control circuit including: a main control chip, a low voltage differential voltage stabilizing circuit, a first resistor, a second resistor, and a set resistor;
  • the chip comprises: a working voltage input end, a common voltage output end, and a voltage dividing reference voltage input end;
  • the low voltage differential voltage stabilizing circuit is configured to receive a voltage provided by the external power supply module and generate a voltage dividing reference voltage according to the received voltage;
  • One end of a resistor is connected to the low voltage differential voltage stabilizing circuit to receive the voltage dividing reference voltage;
  • the other end of the first resistor is connected to a voltage dividing reference voltage input terminal;
  • the second resistor One end is connected to the other end of the first resistor, the other end of the second resistor is electrically grounded;
  • one end of the setting resistor is connected to the main control chip, and the other end of the setting resistor is Electrically grounded;
  • the working voltage input terminal is configured to receive a voltage provided by the external power supply
  • the common voltage and the voltage division reference voltage are an increase in the same direction or a decrease in the same direction.
  • VCOM R2/(R1+R2)*[VREF2-VAA*R1*(n+1)/(2560*Rset)]
  • VCOM represents the common voltage
  • R1 represents the resistance value of the first resistor
  • R2 represents the resistance value of the second resistor
  • Rset represents the resistance value of the set resistor
  • VREF2 represents the partial pressure.
  • the reference voltage, VAA represents the voltage supplied by the external power supply module
  • n takes an integer between 0 and 127.
  • the LDO circuit includes: a voltage regulator chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a third resistor, a fourth resistor, and a fifth resistor; the first capacitor, the second capacitor, the third capacitor, and the One end of the third resistor R3 is configured to receive a voltage provided by the external power supply module, and the first capacitor, the second capacitor, and one end of the third capacitor and the other end of the third resistor are connected To the voltage stabilizing chip, one ends of the fourth capacitor, the fifth capacitor, the sixth capacitor, and the fifth resistor are connected to one end of the first resistor and connected to the voltage regulator a chip, one end of the fourth resistor being connected to the other end of the fifth resistor and connected to the voltage stabilizing chip, the first capacitor, the second capacitor, the third capacitor, the The other ends of the fourth capacitor, the fifth capacitor, the sixth capacitor, and the fourth resistor are electrically grounded.
  • a liquid crystal display screen flicker phenomenon control circuit comprising: a main control chip, a low voltage differential voltage stabilizing circuit, a first resistor, a second resistor, and a set resistor;
  • the control chip includes: a working voltage input end, a common voltage output end, and a voltage dividing reference voltage input end;
  • the low voltage differential voltage stabilizing circuit is configured to receive a voltage provided by the external power supply module and generate a voltage dividing reference voltage according to the received voltage;
  • One end of the first resistor is connected to the low voltage differential voltage stabilizing circuit to receive the voltage dividing reference voltage;
  • the other end of the first resistor is connected to a voltage dividing reference voltage input terminal;
  • the second resistor One end of the device is connected to the other end of the first resistor, and the other end of the second resistor is electrically grounded;
  • one end of the setting resistor is connected to the main control chip, and the other end of the setting resistor One end is electrically grounded;
  • the working voltage input end is configured to receive the
  • VCOM R2/(R1+R2)*[VREF2-VREF2*R1*(n+1)/(2560*Rset)]
  • VCOM represents the common voltage
  • R1 represents the resistance value of the first resistor
  • R2 represents the resistance value of the second resistor
  • Rset represents the resistance value of the set resistor
  • VREF2 represents the partial pressure.
  • n takes an integer between 0 and 127.
  • the voltage drop of the LDO circuit can achieve a voltage difference of 0.3V, and the current can reach 100 mA.
  • the LDO circuit includes: a voltage stabilizing chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a third resistor, a fourth resistor, and a fifth resistor
  • One end of the first capacitor, the second capacitor, the third capacitor, and the third resistor R3 is configured to receive a voltage provided by the external power supply module, the first capacitor One end of the second capacitor and the third capacitor and the other end of the third resistor are connected to the voltage stabilizing chip, the fourth capacitor, the fifth capacitor, and the sixth capacitor
  • one end of the fifth resistor is connected to one end of the first resistor, the working voltage input end, and the voltage stabilizing chip, and one end of the fourth resistor and another one of the fifth resistor
  • One end connected to and connected to the voltage stabilizing chip, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor, and the first The other end of the four resistor is electrically grounded.
  • the invention has the beneficial effects that the present invention changes the partial voltage of the common voltage to the voltage division reference voltage through an LDO circuit, so that the common voltage is affected by the voltage division reference voltage, and the common voltage is higher due to the higher precision of the voltage division reference voltage.
  • the accuracy is improved, and the change of the common voltage and the voltage division reference voltage is the same direction increase, or the same direction is reduced, thereby reducing the flicker phenomenon of the liquid crystal display and optimizing the display effect of the liquid crystal display.
  • FIG. 1 is a circuit diagram of a prior art liquid crystal display screen flicker phenomenon control circuit
  • FIG. 2 is a circuit diagram of a liquid crystal display screen flicker phenomenon control circuit according to an embodiment of the present invention
  • FIG. 3 is a circuit diagram of an LDO circuit of a liquid crystal display screen flicker phenomenon control circuit according to an embodiment of the present invention
  • FIG. 4 is a circuit diagram of a liquid crystal display screen flicker phenomenon control circuit according to another embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a liquid crystal display screen flicker phenomenon control circuit in accordance with an embodiment of the present invention.
  • a liquid crystal display screen flicker phenomenon control circuit includes a main control chip 10, a low voltage differential voltage regulator (LDO) circuit 20, and a first resistor R1 and a second resistor connected to the main control chip 10. R2 and set resistor Rset.
  • LDO low voltage differential voltage regulator
  • the main control chip 10 includes: an operating voltage input terminal 11 for receiving an operating voltage VAA provided by an external power supply module; a common voltage output terminal 12 for outputting a common voltage VCOM for providing a common electrode to the display panel; a horse voltage output terminal 13 for outputting a gamma reference voltage VREF1 for being supplied to a data driver of the display panel provided to the display panel; a voltage dividing reference voltage input terminal 14 for receiving the first voltage provided by the LDO circuit 20 and via the first resistor The divided reference voltage VREF2 input by R1.
  • the main control chip 10 may be, for example, a programmable gamma correction buffer circuit chip (P-GammaIC), but the present invention is not limited thereto.
  • One end of the LDO circuit 20 is for receiving the operating voltage VAA, and the other end is connected to the divided reference voltage input terminal 14 through the first resistor R1.
  • One end of the second resistor R2 is connected between the first resistor R1 and the divided reference voltage input terminal 14, and the other end thereof is electrically grounded.
  • the LDO circuit 20 is for generating a divided reference voltage VREF2 according to the operating voltage VAA.
  • an LDO circuit 20 of a liquid crystal display screen flicker phenomenon control circuit includes a voltage stabilizing chip 21, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth Capacitor C5, sixth capacitor C6, third resistor R3, fourth resistor R4, fifth resistor R5.
  • One ends of the first capacitor C1, the second capacitor C2, the third capacitor C3, and the third resistor R3 are configured to receive an operating voltage VAA, and one end and a third of the first capacitor C1, the second capacitor C2, and the third capacitor C3
  • the other end of the resistor R3 is connected to the voltage stabilizing chip 21.
  • One ends of the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, and the fifth resistor R5 are connected to the first resistor R1 and are connected to the voltage stabilizing chip 21.
  • One end of the fourth resistor R4 is connected to the other end of the fifth resistor R5 and is connected to the voltage stabilizing chip 21, and the other six capacitors C1, C2, C3, C4, C5, C6 and the fourth resistor One end is connected to the ground GND.
  • the voltage drop of the LDO circuit 20 can be made to a voltage difference of 0.3V and the current can be up to 100 mA.
  • the common voltage VCOM is:
  • VCOM R2/(R1+R2)*[VREF2-VAA*R1*(n+1)/(2560*RSET)], where n takes an integer between 0 and 127.
  • the common voltage VCOM is affected by the two voltages of the operating voltage VAA and the divided reference voltage VREF2. Since the accuracy of the divided reference voltage VREF2 is higher than the accuracy of the operating voltage VAA, the accuracy of the common voltage VCOM is improved, and the common voltage VCOM is subjected to the voltage division reference.
  • the influence of the voltage VREF2 is an increase in the same direction, or a decrease in the same direction, so that the flicker change of the liquid crystal display flicker phenomenon is reduced.
  • FIG. 4 is a circuit diagram of a liquid crystal display screen flicker phenomenon control circuit according to another embodiment of the present invention.
  • the liquid crystal display screen flicker phenomenon control circuit shown in FIG. 2 is different in that the operating voltage input terminal 11 is also connected to the LDO circuit 20 to receive the divided voltage reference voltage VREF2 as the power supply voltage of the main control chip 10.
  • the common voltage VCOM is:
  • VCOM R2/(R1+R2)*[VREF2-VREF2*R1*(n+1)/(2560*RSET)], where n takes an integer between 0 and 127.
  • the common voltage VCOM is only affected by the voltage division reference voltage VREF2, and the accuracy of the voltage division reference voltage VREF2 is higher than the accuracy of the working voltage VAA, the variation of the common voltage VCOM becomes smaller, the accuracy of the common voltage VCOM is improved, and the public The voltage VCOM is affected by the voltage division reference voltage VREF2, and the change is the increase in the same direction, or the decrease in the same direction, so that the flicker change of the liquid crystal display flicker phenomenon is reduced.
  • the liquid crystal display screen flickering control circuit of the present invention can achieve a voltage difference of 0.3V through a voltage drop and the current can reach a 100 mA LDO circuit, and the partial voltage of the common voltage VCOM is changed to the divided voltage reference voltage VREF2, so that the common voltage VCOM is subjected to The influence of the voltage division reference voltage VREF2, since the accuracy of the voltage division reference voltage VREF2 is higher than the accuracy of the operating voltage VAA, the accuracy of the common voltage VCOM is improved, and the variation of the common voltage VCOM and the voltage division reference voltage VREF2 is the same direction. , or the reduction of the same direction, thereby reducing the phenomenon of liquid crystal display screen flicker and optimizing the display effect of the liquid crystal display.

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Abstract

一种液晶显示器画面闪烁现象控制电路，包括：主控芯片（10）、LDO电路（20）、第一电阻器（R1）、第二电阻器（R2）及设置电阻器（Rset）。主控芯片（10）包括：工作电压输入端（11）、公共电压输出端（12）、分压参考电压输入端（14）。LDO电路（20）根据接收的外部电压产生分压参考电压（VREF2）；第一电阻器（R1）的一端接收该分压参考电压（VREF2），其另一端连接到分压参考电压输入端（14）；第二电阻器（R2）的一端连接到第一电阻器（R1）的另一端，其另一端电性接地；设置电阻器（Rset）的一端连接到主控芯片（10），其另一端电性接地；工作电压输入端（11）用于接收外部电压，以作为主控芯片的工作电压（VAA）；公共电压输出端（12）用于输出主控芯片（10）产生的公共电压（VCOM）；公共电压（VCOM）与分压参考电压（VREF2）呈正相关关系。其减小了液晶显示器画面闪烁现象且优化了液晶显示器的显示效果。

Description

液晶显示器画面闪烁现象控制电路 技术领域
本发明涉及液晶显示技术领域，尤其是涉及一种液晶显示器画面闪烁现象控制电路。
背景技术
目前，液晶面板与控制板(Control Board，CB)分离的机种在出货时，液晶面板与控制板是分开出货的，不同的控制板由于电阻、芯片(IC)等元件自身存在误差，各个控制板的由外部提供的工作电压、由外部提供的参考电压及公共电压之间存在一些误差，因此，同一液晶面板搭配不同的控制板时的最佳公共电压是不同的。在产线上依据不同的控制板做自动伽马校正(auto gamma)而调整好的最佳画面闪烁(Flicker)的相关参数是存在于液晶面板的闪存(Flash)内的，出货时液晶面板将随机搭配不同的控制板，而不同的控制板的由外部提供的工作电压、由外部提供的参考电压及公共电压会存在差异，此时液晶面板的画面闪烁会因为搭配不同的控制板而存在差异。
当液晶跨压已接近人眼反应速度的频率改变时，由于灰阶改变，会使人感觉到画面闪烁(flicker)现象，极性反转时电压不对称严重，会使flicker现象变严重。假定液晶面板经auto gamma调整后的最佳flicker为20，而搭配不同的控制板后的flicker将可能会达到80，控制板的由外部提供的工作电压的管控范围为15.3+/-0.3V，0.6V的偏差。请同时参阅图1示出的现有技术的控制板上的可编程伽玛校正缓冲电路芯片(P-GammaIC)的架构图，此时公共电压VCOM以下面的式子1求得。
[式子1]  VCOM＝R2/(R1+R2)*[VAA1-VAA2*R1*(n+1)/2560*Rset]，
其中，VAA2表示Pgamma IC的工作电压，其由外部的供电模块提供；VAA1表示作为Pgamma IC产生的公共电压VCOM的分压，其也由外部的供电模块提供；下面的Vgamma是Pgamma IC产生的伽马参考电压，其通常提供给显示面 板的数据驱动器；VCOM是Pgamma IC产生的公共电压，其提供给显示面板的公共电极。其中，VAA1和VAA2用途不一样，但是电压值都一样，均是由外部的同一供电模块提供的。
从式1中可知，由于VAA1和VAA2的管控范围为15.3+/-0.3V，0.6V的偏差，因此公共电压VCOM受VAA1和VAA2的影响较大，液晶显示器画面闪烁现象较严重。
发明内容
为克服现有技术的不足，提供一种能够减小液晶显示器画面闪烁现象、优化液晶显示器的显示效果的液晶显示器画面闪烁现象控制电路。
根据本发明的一方面，提供了一种液晶显示器画面闪烁现象控制电路，其包括：主控芯片、低压差分稳压电路、第一电阻器、第二电阻器及设置电阻器；所述主控芯片包括：工作电压输入端、公共电压输出端、分压参考电压输入端；所述低压差分稳压电路用于接收外部供电模块提供的电压且根据接收的电压产生分压参考电压；所述第一电阻器的一端连接到所述所述低压差分稳压电路，以接收所述分压参考电压；所述第一电阻器的另一端连接到分压参考电压输入端；所述第二电阻器的一端连接到所述第一电阻器的另一端，所述第二电阻器的另一端电性接地；所述设置电阻器的一端连接到所述主控芯片，所述设置电阻器的另一端电性接地；所述工作电压输入端用于接收所述外部供电模块提供的电压，以作为所述主控芯片的工作电压；公共电压输出端用于输出所述主控芯片产生的公共电压；所述公共电压与所述分压参考电压呈正相关关系。
进一步地，所述公共电压与所述分压参考电压是同方向的增大或者同方向的减小。
进一步地，所述公共电压被表示为：
VCOM＝R2/(R1+R2)*[VREF2-VAA*R1*(n+1)/(2560*Rset)]
其中，VCOM表示所述公共电压，R1表示所述第一电阻器的电阻值，R2表示所述第二电阻器的电阻值，Rset表示所述设置电阻器的电阻值，VREF2表示所述分压参考电压，VAA表示所述外部供电模块提供的电压，n取0～127之间的整数。
进一步地，所述LDO电路包括：稳压芯片、第一电容器、第二电容器、 第三电容器、第四电容器、第五电容器、第六电容器、第三电阻器、第四电阻器和第五电阻器；所述第一电容器、所述第二电容器、所述第三电容器及所述第三电阻器R3的一端用于接收所述外部供电模块提供的电压，所述第一电容器、所述第二电容器和所述第三电容器的一端以及所述第三电阻器的另一端连接到所述稳压芯片，所述第四电容器、所述第五电容器、所述第六电容器及所述第五电阻器的一端连接到所述第一电阻器的一端且连接到所述稳压芯片，所述第四电阻器的一端与所述第五电阻器的另一端相连且连接到所述稳压芯片，所述第一电容器、所述第二电容器、所述第三电容器、所述第四电容器、所述第五电容器、所述第六电容器及所述第四电阻器的另一端电性接地。
根据本发明的另一方面，提供了一种液晶显示器画面闪烁现象控制电路，其包括：主控芯片、低压差分稳压电路、第一电阻器、第二电阻器及设置电阻器；所述主控芯片包括：工作电压输入端、公共电压输出端、分压参考电压输入端；所述低压差分稳压电路用于接收外部供电模块提供的电压且根据接收的电压产生分压参考电压；所述第一电阻器的一端连接到所述所述低压差分稳压电路，以接收所述分压参考电压；所述第一电阻器的另一端连接到分压参考电压输入端；所述第二电阻器的一端连接到所述第一电阻器的另一端，所述第二电阻器的另一端电性接地；所述设置电阻器的一端连接到所述主控芯片，所述设置电阻器的另一端电性接地；所述工作电压输入端用于接收产生的所述分压参考电压，以作为所述主控芯片的工作电压；公共电压输出端用于输出所述主控芯片产生的公共电压；所述公共电压与所述分压参考电压呈正相关关系。
进一步地，所述公共电压被表示为：
VCOM＝R2/(R1+R2)*[VREF2-VREF2*R1*(n+1)/(2560*Rset)]
其中，VCOM表示所述公共电压，R1表示所述第一电阻器的电阻值，R2表示所述第二电阻器的电阻值，Rset表示所述设置电阻器的电阻值，VREF2表示所述分压参考电压，n取0～127之间的整数。
进一步地，所述LDO电路的压降可做到0.3V压差，电流可达到100mA。
进一步地，所述LDO电路包括：稳压芯片、第一电容器、第二电容器、第三电容器、第四电容器、第五电容器、第六电容器、第三电阻器、第四电阻器和第五电阻器；所述第一电容器、所述第二电容器、所述第三电容器及所述第三电阻器R3的一端用于接收所述外部供电模块提供的电压，所述第一电容 器、所述第二电容器和所述第三电容器的一端以及所述第三电阻器的另一端连接到所述稳压芯片，所述第四电容器、所述第五电容器、所述第六电容器及所述第五电阻器的一端连接到所述第一电阻器的一端、所述工作电压输入端以及所述稳压芯片，所述第四电阻器的一端与所述第五电阻器的另一端相连且连接到所述稳压芯片，所述第一电容器、所述第二电容器、所述第三电容器、所述第四电容器、所述第五电容器、所述第六电容器及所述第四电阻器的另一端电性接地。
本发明的有益效果是：本发明通过一个LDO电路将公共电压的分压改为分压参考电压，使得公共电压受分压参考电压的影响，由于分压参考电压的精度较高，因此公共电压的精度提高，且公共电压与分压参考电压的变化是同方向的增大，或同方向的减小，从而减小了液晶显示器画面闪烁现象且优化了液晶显示器的显示效果。
附图说明
通过结合附图进行的以下描述，本发明的实施例的上述和其它方面、特点和优点将变得更加清楚，附图中：
图1是现有技术的液晶显示器画面闪烁现象控制电路的电路示意图；
图2是根据本发明的实施例的液晶显示器画面闪烁现象控制电路的电路图；
图3是根据本发明的实施例的液晶显示器画面闪烁现象控制电路的LDO电路的电路图；
图4是根据本发明的另一实施例的液晶显示器画面闪烁现象控制电路的电路图。
具体实施方式
以下，将参照附图来详细描述本发明的实施例。然而，可以以许多不同的形式来实施本发明，并且本发明不应该被解释为限制于这里阐述的具体实施例。相反，提供这些实施例是为了解释本发明的原理及其实际应用，从而使本领域的其他技术人员能够理解本发明的各种实施例和适合于特定预期应用的 各种修改。
图2是根据本发明的实施例的液晶显示器画面闪烁现象控制电路的电路图。
参照图2，根据本发明的实施例的液晶显示器画面闪烁现象控制电路包括主控芯片10、低压差分稳压(LDO)电路20、与主控芯片10相连的第一电阻器R1、第二电阻器R2及设置电阻器Rset。该主控芯片10包括：工作电压输入端11，用于接收由外部的供电模块提供的工作电压VAA；公共电压输出端12，用于输出公共电压VCOM，以提供给显示面板的公共电极；伽马电压输出端13，用于输出伽马参考电压VREF1，以提供给显示面板的提供给显示面板的数据驱动器；分压参考电压输入端14，用于接收由LDO电路20提供且经由第一电阻器R1输入的分压参考电压VREF2。在本实施例中，主控芯片10可例如是可编程伽玛校正缓冲电路芯片(P-GammaIC)，但本发明并不限制于此。
LDO电路20一端用于接收工作电压VAA，其另一端通过第一电阻器R1连接到分压参考电压输入端14。第二电阻器R2的一端连接到第一电阻器R1和分压参考电压输入端14之间，其另一端电性接地。LDO电路20用于根据工作电压VAA产生分压参考电压VREF2。
图3是根据本发明的实施例的液晶显示器画面闪烁现象控制电路的LDO电路的电路图。参照图3，根据本发明的实施例的液晶显示器画面闪烁现象控制电路的LDO电路20包括稳压芯片21、第一电容器C1、第二电容器C2、第三电容器C3、第四电容器C4、第五电容器C5、第六电容器C6、第三电阻器R3、第四电阻器R4期第五电阻器R5。
该第一电容器C1、第二电容器C2、第三电容器C3及第三电阻器R3的一端用于接收工作电压VAA，该第一电容器C1、第二电容器C2以及第三电容器C3的一端与第三电阻器R3的另一端连接到稳压芯片21。该第四电容器C4、第五电容器C5、第六电容器C6及第五电阻器R5的一端与第一电阻器R1相连且连接到稳压芯片21。该第四电阻器R4的一端与该第五电阻器R5的另一端相连且连接到稳压芯片21，该六个电容器C1、C2、C3、C4、C5、C6及该第四电阻器的另一端共同接地端GND。
由图2与图3可以看出，LDO电路20的压降可以做到0.3V压差且电流可以到100mA，此时，公共电压VCOM为：
VCOM＝R2/(R1+R2)*[VREF2-VAA*R1*(n+1)/(2560*RSET)]，其中，n取0～127之间的整数。公共电压VCOM受工作电压VAA和分压参考电压VREF2两个电压影响，由于分压参考电压VREF2的精度比工作电压VAA的精度要高，公共电压VCOM的精度提高，且公共电压VCOM受分压参考电压VREF2的影响，其变化是同方向的增大，或同方向的减小，从而液晶显示器的画面闪烁现象flicker的变化会减小。
图4是根据本发明的另一实施例的液晶显示器画面闪烁现象控制电路的电路图。
参照图4，与图2所示的液晶显示器画面闪烁现象控制电路不同之处在于：工作电压输入端11也连接到LDO电路20，以接收分压参考电压VREF2作为主控芯片10的供电电压。此时，公共电压VCOM为：
VCOM＝R2/(R1+R2)*[VREF2-VREF2*R1*(n+1)/(2560*RSET)]，其中，n取0～127之间的整数。可以看出，公共电压VCOM仅受分压参考电压VREF2的影响，而分压参考电压VREF2的精度高于工作电压VAA的精度，公共电压VCOM的变化变小，公共电压VCOM的精度提高，且公共电压VCOM受分压参考电压VREF2的影响，其变化是同方向的增大，或同方向的减小，从而液晶显示器的画面闪烁现象flicker的变化会减小。
本发明液晶显示器画面闪烁现象控制电路通过一个压降可以做到0.3V压差且电流可以到100mA的LDO电路，并将公共电压VCOM的分压改为分压参考电压VREF2，使得公共电压VCOM受分压参考电压VREF2的影响，由于分压参考电压VREF2的精度比工作电压VAA的精度要高，公共电压VCOM的精度提高，且公共电压VCOM与分压参考电压VREF2的变化是同方向的增大，或同方向的减小，从而减小了液晶显示器画面闪烁现象且优化了液晶显示器的显示效果。
虽然已经参照特定实施例示出并描述了本发明，但是本领域的技术人员将理解：在不脱离由权利要求及其等同物限定的本发明的精神和范围的情况下， 可在此进行形式和细节上的各种变化。

Claims (14)

  1. 一种液晶显示器画面闪烁现象控制电路，其中，包括：主控芯片、低压差分稳压电路、第一电阻器、第二电阻器及设置电阻器；所述主控芯片包括：工作电压输入端、公共电压输出端、分压参考电压输入端；
    所述低压差分稳压电路用于接收外部供电模块提供的电压且根据接收的电压产生分压参考电压；所述第一电阻器的一端连接到所述所述低压差分稳压电路，以接收所述分压参考电压；所述第一电阻器的另一端连接到分压参考电压输入端；所述第二电阻器的一端连接到所述第一电阻器的另一端，所述第二电阻器的另一端电性接地；所述设置电阻器的一端连接到所述主控芯片，所述设置电阻器的另一端电性接地；所述工作电压输入端用于接收所述外部供电模块提供的电压，以作为所述主控芯片的工作电压；公共电压输出端用于输出所述主控芯片产生的公共电压；所述公共电压与所述分压参考电压呈正相关关系。
  2. 根据权利要求1所述的液晶显示器画面闪烁现象控制电路，其中，所述公共电压与所述分压参考电压是同方向的增大或者同方向的减小。
  3. 根据权利要求1所述的液晶显示器画面闪烁现象控制电路，其中，所述公共电压被表示为式子1，
    [式子1] VCOM＝R2/(R1+R2)*[VREF2-VAA*R1*(n+1)/(2560*Rset)]
    其中，VCOM表示所述公共电压，R1表示所述第一电阻器的电阻值，R2表示所述第二电阻器的电阻值，Rset表示所述设置电阻器的电阻值，VREF2表示所述分压参考电压，VAA表示所述外部供电模块提供的电压，n取0～127之间的整数。
  4. 根据权利要求2所述的液晶显示器画面闪烁现象控制电路，其中，所述公共电压被表示为式子1，
    [式子1] VCOM＝R2/(R1+R2)*[VREF2-VAA*R1*(n+1)/(2560*Rset)]
    其中，VCOM表示所述公共电压，R1表示所述第一电阻器的电阻值，R2表示所述第二电阻器的电阻值，Rset表示所述设置电阻器的电阻值，VREF2表示所述分压参考电压，VAA表示所述外部供电模块提供的电压，n取0～127之间的整数。
  5. 根据权利要求1所述的液晶显示器画面闪烁现象控制电路，其中，所述低压差分稳压电路的压降可做到0.3V压差，电流可达到100mA。
  6. 根据权利要求1所述的液晶显示器画面闪烁现象控制电路，其中，所述低压差分稳压电路包括：稳压芯片、第一电容器、第二电容器、第三电容器、第四电容器、第五电容器、第六电容器、第三电阻器、第四电阻器和第五电阻器；
    所述第一电容器、所述第二电容器、所述第三电容器及所述第三电阻器的一端用于接收所述外部供电模块提供的电压，所述第一电容器、所述第二电容器和所述第三电容器的一端以及所述第三电阻器的另一端连接到所述稳压芯片，所述第四电容器、所述第五电容器、所述第六电容器及所述第五电阻器的一端连接到所述第一电阻器的一端且连接到所述稳压芯片，所述第四电阻器的一端与所述第五电阻器的另一端相连且连接到所述稳压芯片，所述第一电容器、所述第二电容器、所述第三电容器、所述第四电容器、所述第五电容器、所述第六电容器及所述第四电阻器的另一端电性接地。
  7. 根据权利要求5所述的液晶显示器画面闪烁现象控制电路，其中，所述低压差分稳压电路包括：稳压芯片、第一电容器、第二电容器、第三电容器、第四电容器、第五电容器、第六电容器、第三电阻器、第四电阻器和第五电阻器；
    所述第一电容器、所述第二电容器、所述第三电容器及所述第三电阻器的一端用于接收所述外部供电模块提供的电压，所述第一电容器、所述第二电容器和所述第三电容器的一端以及所述第三电阻器的另一端连接到所述稳压芯片，所述第四电容器、所述第五电容器、所述第六电容器及所述第五电阻器的一端连接到所述第一电阻器的一端且连接到所述稳压芯片，所述第四电阻器的一端与所述第五电阻器的另一端相连且连接到所述稳压芯片，所述第一电容器、所述第二电容器、所述第三电容器、所述第四电容器、所述第五电容器、所述第六电容器及所述第四电阻器的另一端电性接地。
  8. 一种液晶显示器画面闪烁现象控制电路，其中，包括：主控芯片、低压差分稳压电路、第一电阻器、第二电阻器及设置电阻器；所述主控芯片包括：工作电压输入端、公共电压输出端、分压参考电压输入端；
    所述低压差分稳压电路用于接收外部供电模块提供的电压且根据接收的 电压产生分压参考电压；所述第一电阻器的一端连接到所述所述低压差分稳压电路，以接收所述分压参考电压；所述第一电阻器的另一端连接到分压参考电压输入端；所述第二电阻器的一端连接到所述第一电阻器的另一端，所述第二电阻器的另一端电性接地；所述设置电阻器的一端连接到所述主控芯片，所述设置电阻器的另一端电性接地；所述工作电压输入端用于接收产生的所述分压参考电压，以作为所述主控芯片的工作电压；公共电压输出端用于输出所述主控芯片产生的公共电压；所述公共电压与所述分压参考电压呈正相关关系。
  9. 根据权利要求8所述的液晶显示器画面闪烁现象控制电路，其中，所述公共电压与所述分压参考电压是同方向的增大或者同方向的减小。
  10. 根据权利要求8所述的液晶显示器画面闪烁现象控制电路，其中，所述公共电压被表示为式子1，
    [式子1] VCOM＝R2/(R1+R2)*[VREF2-VREF2*R1*(n+1)/(2560*Rset)]
    其中，VCOM表示所述公共电压，R1表示所述第一电阻器的电阻值，R2表示所述第二电阻器的电阻值，Rset表示所述设置电阻器的电阻值，VREF2表示所述分压参考电压，n取0～127之间的整数。
  11. 根据权利要求9所述的液晶显示器画面闪烁现象控制电路，其中，所述公共电压被表示为式子1，
    [式子1] VCOM＝R2/(R1+R2)*[VREF2-VREF2*R1*(n+1)/(2560*Rset)]
    其中，VCOM表示所述公共电压，R1表示所述第一电阻器的电阻值，R2表示所述第二电阻器的电阻值，Rset表示所述设置电阻器的电阻值，VREF2表示所述分压参考电压，n取0～127之间的整数。
  12. 根据权利要求8所述的液晶显示器画面闪烁现象控制电路，其中，所述低压差分稳压电路的压降可做到0.3V压差，电流可达到100mA。
  13. 根据权利要求8所述的液晶显示器画面闪烁现象控制电路，其中，所述低压差分稳压电路包括：稳压芯片、第一电容器、第二电容器、第三电容器、第四电容器、第五电容器、第六电容器、第三电阻器、第四电阻器和第五电阻器；
    所述第一电容器、所述第二电容器、所述第三电容器及所述第三电阻器的一端用于接收所述外部供电模块提供的电压，所述第一电容器、所述第二电容 器和所述第三电容器的一端以及所述第三电阻器的另一端连接到所述稳压芯片，所述第四电容器、所述第五电容器、所述第六电容器及所述第五电阻器的一端连接到所述第一电阻器的一端、所述工作电压输入端以及所述稳压芯片，所述第四电阻器的一端与所述第五电阻器的另一端相连且连接到所述稳压芯片，所述第一电容器、所述第二电容器、所述第三电容器、所述第四电容器、所述第五电容器、所述第六电容器及所述第四电阻器的另一端电性接地。
  14. 根据权利要求12所述的液晶显示器画面闪烁现象控制电路，其中，所述低压差分稳压电路包括：稳压芯片、第一电容器、第二电容器、第三电容器、第四电容器、第五电容器、第六电容器、第三电阻器、第四电阻器和第五电阻器；
    所述第一电容器、所述第二电容器、所述第三电容器及所述第三电阻器的一端用于接收所述外部供电模块提供的电压，所述第一电容器、所述第二电容器和所述第三电容器的一端以及所述第三电阻器的另一端连接到所述稳压芯片，所述第四电容器、所述第五电容器、所述第六电容器及所述第五电阻器的一端连接到所述第一电阻器的一端、所述工作电压输入端以及所述稳压芯片，所述第四电阻器的一端与所述第五电阻器的另一端相连且连接到所述稳压芯片，所述第一电容器、所述第二电容器、所述第三电容器、所述第四电容器、所述第五电容器、所述第六电容器及所述第四电阻器的另一端电性接地。
PCT/CN2016/100450 2016-08-31 2016-09-27 液晶显示器画面闪烁现象控制电路 Ceased WO2018040165A1 (zh)

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