WO2017092095A1 - gamma参考电压纹波过滤电路以及液晶显示器 - Google Patents

gamma参考电压纹波过滤电路以及液晶显示器 Download PDF

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Publication number
WO2017092095A1
WO2017092095A1 PCT/CN2015/098638 CN2015098638W WO2017092095A1 WO 2017092095 A1 WO2017092095 A1 WO 2017092095A1 CN 2015098638 W CN2015098638 W CN 2015098638W WO 2017092095 A1 WO2017092095 A1 WO 2017092095A1
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Prior art keywords
resistor
reference voltage
gamma reference
capacitor
liquid crystal
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Ceased
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PCT/CN2015/098638
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English (en)
French (fr)
Inventor
周丽
曹丹
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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 US14/905,786 priority Critical patent/US9966020B2/en
Publication of WO2017092095A1 publication Critical patent/WO2017092095A1/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
    • G09G3/3607—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
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/625—Regulating voltage or current  wherein it is irrelevant whether the variable actually regulated is AC or DC
    • G05F1/63—Regulating voltage or current  wherein it is irrelevant whether the variable actually regulated is AC or DC using variable impedances in series with the load as final control devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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
    • 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
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

Definitions

  • a thin film transistor liquid crystal display has a plurality of pixel units on a display panel, and each pixel unit has three sub-pixels of red, green, and blue. The brightness exhibited by each sub-pixel is determined by the gamma reference voltage.
  • the function of the gamma reference voltage generating circuit is to set the gamma reference voltage according to the gamma curve required by the liquid crystal display, and as a reference voltage for the gray scale display of the thin film transistor liquid crystal display.
  • Each gamma reference voltage is input to a source driver of a thin film transistor liquid crystal display, and a digital-to-analog converter in the source driver generates all gray voltages.
  • the prior art provides an LC filter circuit between the gamma reference voltage circuit and the thin film transistor liquid crystal display to filter the gamma reference voltage.
  • the capacitance characteristics of each pixel unit are different, so it will respond to the effect of gamma reference voltage filtering. If the filtering effect of the gamma reference voltage is insufficient, the pressure difference between the two ends of the liquid crystal is unstable, which leads to the instability of the liquid crystal reversal angle, which causes a flicker phenomenon and affects the image quality.
  • the technical problem to be solved by the embodiments of the present invention is to provide a gamma reference voltage ripple filter circuit and a liquid crystal display, which can better filter the ripple voltage and prevent the flicker phenomenon.
  • the invention provides a gamma reference voltage ripple filtering circuit, comprising a filtering module, configured to receive a gamma reference voltage output by a gamma reference voltage circuit, filter the gamma reference voltage, and filter the gamma
  • the reference voltage is sent to the thin film transistor liquid crystal display
  • the gamma reference voltage ripple filtering circuit further includes: a detecting module for detecting the filtered gamma reference voltage to obtain a detecting voltage; and a comparing module for comparing the detecting voltage
  • the adjusting module is configured to adjust the filtering module according to the comparison result, so that the ripple of the filtered gamma reference voltage output by the filtering module is within a preset range.
  • the filtering module includes an adjustable resistor and a filter capacitor
  • the detecting module includes a first sampling resistor, a second sampling resistor, and an analog-to-digital converter
  • the comparing module and the adjusting module are integrated in the control
  • One end of the adjustable resistor is connected to the gamma reference voltage circuit, and the other end of the adjustable resistor is connected to the thin film transistor liquid crystal display, and one end of the filter capacitor is connected to the other end of the adjustable varistor and the a common end of the thin film transistor liquid crystal display, the other end of the filter capacitor is grounded, one end of the first sampling resistor is connected to the other end of the adjustable varistor and the common end of the thin film transistor liquid crystal display, the first sampling The other end of the resistor is connected to one end of the second sampling resistor, the other end of the second sampling resistor is grounded, and the first sampling resistor and the common end of the second sampling resistor are connected to one end of the analog-to-digital converter.
  • the other end of the analog-to-digital converter is connected to one end of the controller, and the other end of the controller is connected to the adjustable end of the adjustable resistor, ga
  • the filtered reference voltage is filtered by the adjustable resistor and the filter capacitor to obtain a filtered gamma reference voltage, and the filtered gamma reference voltage passes through the first sampling resistor and the second sampling resistor.
  • a divided voltage is obtained, and the divided voltage is converted by the analog-to-digital converter to obtain a digital signal, and the digital signal is compared with a comparison voltage stored in the controller, and compared according to the comparison
  • the resistance of the adjustable resistor is adjusted such that the ripple of the filtered gamma reference voltage output by the filtering module is within a preset range.
  • the adjustable resistor and the controller are integrated in the gamma reference voltage circuit.
  • the filtering module includes a first resistor, a first partial capacitor, a second resistor, and a second partial capacitor
  • the detecting module includes a third resistor and a fourth resistor
  • the comparing module includes a first comparator and a second comparator
  • the adjustment module includes an OR operator, a first switch tube, a second switch tube, a fifth resistor and a third switch, the first end of the first switch is used to connect the gamma reference voltage circuit, and the second end of the first switch is used to connect one end of the first resistor
  • the other end of the first resistor is connected to one end of the first sub-capacitor, the other end of the first sub-capacitor is grounded, and the other end of the first resistor is connected to the common end of one end of the first sub-capacitor.
  • the other end of the first resistor is connected to one end of the third resistor to a common end of the first partial capacitor, and the other end of the third resistor is connected to the first One end of the fourth resistor, the other end of the fourth resistor is grounded, the common end of the third resistor and the fourth resistor is connected to the positive end of the first comparator, and the negative end of the first comparator is used Inputting a first reference voltage, an output end of the first comparator is connected to a first input end of the OR operator, and a common end of the third resistor and the fourth resistor is connected to the second comparator Negative end, the positive end of the second comparator is used Entering a second reference voltage, the output of the second comparator is connected to the second input end of the OR operator, and the output end of the OR operator is connected to the third end of the first switch tube, An output end of the operator is connected to the first end of the second switch tube, a second end of the second switch tube is connected to one end of the fifth
  • the resistance of the first resistor is smaller than the resistance of the second resistor, and the capacitance of the first capacitor is equal to the capacitance of the second capacitor.
  • the present invention also provides a liquid crystal display comprising a liquid crystal display and a substrate, wherein the liquid crystal display comprises a gamma reference voltage ripple filter circuit, the gamma reference voltage ripple filter circuit comprises a filter module, the filter module is used for Receiving a gamma reference voltage output by the gamma reference voltage circuit, filtering the gamma reference voltage, and transmitting the filtered gamma reference voltage to the thin film transistor liquid crystal display, the gamma reference voltage ripple filter circuit further comprising: a detection module, The method is configured to detect a filtered gamma reference voltage to obtain a detection voltage, and a comparison module, configured to compare the detection voltages to obtain a comparison result; and an adjustment module, And configured to adjust the filtering module according to the comparison result, so that a ripple of the filtered gamma reference voltage output by the filtering module is within a preset range.
  • the liquid crystal display comprises a gamma reference voltage ripple filter circuit
  • the filtering module includes an adjustable resistor and a filter capacitor
  • the detecting module includes a first sampling resistor, a second sampling resistor, and an analog-to-digital converter
  • the comparing module and the adjusting module are integrated in the control
  • One end of the adjustable resistor is connected to the gamma reference voltage circuit, and the other end of the adjustable resistor is connected to the thin film transistor liquid crystal display, and one end of the filter capacitor is connected to the other end of the adjustable varistor and the a common end of the thin film transistor liquid crystal display, the other end of the filter capacitor is grounded, one end of the first sampling resistor is connected to the other end of the adjustable varistor and the common end of the thin film transistor liquid crystal display, the first sampling The other end of the resistor is connected to one end of the second sampling resistor, the other end of the second sampling resistor is grounded, and the first sampling resistor and the common end of the second sampling resistor are connected to one end of the analog-to-digital converter.
  • a divided voltage is obtained, and the divided voltage is converted by the analog-to-digital converter to obtain a digital signal, and the digital signal is compared with a comparison voltage stored in the controller, and compared according to the comparison
  • the resistance of the adjustable resistor is adjusted such that the ripple of the filtered gamma reference voltage output by the filtering module is within a preset range.
  • the adjustable resistor and the controller are integrated in the gamma reference voltage circuit.
  • the filtering module includes a first resistor, a first partial capacitor, a second resistor, and a second partial capacitor
  • the detecting module includes a third resistor and a fourth resistor
  • the comparing module includes a first comparator and a second comparator
  • the adjustment module includes an OR operator, a first switch tube, a second switch tube, a fifth resistor, and a third switch tube
  • the first end of the first switch tube is configured to connect the gamma reference a voltage circuit
  • a second end of the first switch tube is connected to one end of the first resistor
  • another end of the first resistor is connected to one end of the first partial capacitor
  • the first partial capacitor is another One end of the first resistor and a common end of the first partial capacitor are used to connect the thin film transistor liquid crystal display, and the other end of the first resistor and one end of the first partial capacitor
  • the common end is connected to one end of the third resistor, and the other end of the third resistor is connected to one end of the fourth resistor.
  • the other end of the fourth resistor is grounded, the common end of the third resistor and the fourth resistor is connected to the positive end of the first comparator, and the negative end of the first comparator is used to input the first reference a voltage, a first terminal of the first comparator is connected to a first input end of the OR operator, and a common end of the third resistor and the fourth resistor is connected to a negative end of the second comparator, a positive terminal of the second comparator is configured to input a second reference voltage, an output end of the second comparator is connected to a second input end of the OR operator, and an output end of the OR operator is connected to the first switch a third end of the tube, an output end of the OR operator is connected to a first end of the second switch tube, and a second end of the second switch tube is connected to one end of the fifth resistor, the fifth resistor
  • the other end is connected to the power source, the third end of the second switch tube is grounded, the first end of the third switch tube is used to connect the gamma reference
  • the resistance of the first resistor is smaller than the resistance of the second resistor, and the capacitance of the first capacitor is equal to the capacitance of the second capacitor.
  • the present invention can detect the voltage outputted by the gamma reference voltage ripple filter circuit, compare it according to the detected voltage to obtain a comparison result, and finally adjust the filter module according to the comparison result, so that the filter module output filter
  • the ripple of the gamma reference voltage is within a preset range, thereby reaching a stable differential pressure across the liquid crystal, preventing the liquid crystal reversal angle from being unstable and causing a flicker phenomenon to affect the image quality.
  • FIG. 1 is a circuit block diagram of a gamma reference voltage ripple filter circuit provided by the present invention
  • FIG. 2 is a circuit diagram of a gamma reference voltage ripple filter circuit provided by the present invention.
  • FIG. 1 is a circuit block diagram of a gamma reference voltage ripple filter circuit provided by the present invention.
  • the gamma reference voltage ripple filter circuit of the present invention comprises: a filter module 120, a detection module 140, a comparison module 150, and an adjustment module 160.
  • the gamma reference voltage circuit 110 is connected to the first end of the filter module 120, and the second end of the filter module 120 is connected to the thin film transistor liquid crystal display 130.
  • the filter module 120 is connected to one end of the detection module 140 at the common end of the thin film transistor liquid crystal display 130, the other end of the detection module 140 is connected to one end of the comparison module 150, and the other end of the comparison module 150 is connected to one end of the adjustment module 160, and the other end of the adjustment module 160 One end is connected to the third end of the filter module 120.
  • the gamma reference voltage circuit 110 outputs a gamma reference voltage to the filtering module 120.
  • the filtering module 120 filters the gamma reference voltage and transmits the filtered gamma reference voltage to the thin film transistor liquid crystal display 130.
  • the detection module 140 receives the filtered gamma reference voltage output by the filtering module 120, and detects the filtered gamma reference voltage to obtain a detection voltage, and sends the detection voltage to the comparison module 150.
  • the comparison module 150 receives the detection voltage sent by the detection module 140, compares the detection voltages to obtain a comparison result, and sends the comparison result to the adjustment module 160.
  • the adjustment module 160 receives the comparison result and adjusts according to the comparison result.
  • the filtering module 120 is configured to cause the ripple of the filtered gamma reference voltage output by the filtering module 120 to be within a preset range.
  • the present invention can detect the voltage outputted by the gamma reference voltage ripple filter circuit, compare it according to the detected voltage to obtain a comparison result, and finally adjust the filter module according to the comparison result, so that the filter module output filter
  • the ripple of the gamma reference voltage is within a preset range, thereby reaching a stable differential pressure across the liquid crystal, preventing the liquid crystal reversal angle from being unstable and causing a flicker phenomenon to affect the image quality.
  • FIG. 2 is a circuit diagram of a gamma reference voltage ripple filter circuit provided by the present invention.
  • the gamma reference voltage ripple filtering circuit of this embodiment includes: a filtering module 120 , a detecting module 140 , a comparing module 150 , and an adjusting module 160 .
  • the filter module 120 includes an adjustable resistor Rx and a filter capacitor C.
  • the detection module 140 includes a first sampling resistor Ra, a second sampling resistor Rb, and an analog-to-digital converter 141.
  • the comparison module 150 and the adjustment module 160 are integrated in the controller 151.
  • One end of the adjustable resistor Rx is connected to the gamma reference voltage circuit 110, and the other end of the adjustable resistor Rx is connected to the thin film transistor liquid crystal display 130.
  • One end of the filter capacitor C is connected to the other end of the adjustable varistor Rx and the common end of the thin film transistor liquid crystal display 130.
  • the other end of the filter capacitor C is grounded.
  • One end of the first sampling resistor Ra is connected to the other end of the adjustable varistor Rx and the common end of the thin film transistor liquid crystal display 130.
  • the other end of the first sampling resistor Ra is connected to one end of the second sampling resistor Rb.
  • the other end of the second sampling resistor Rb is grounded, the common end of the first sampling resistor Ra and the second sampling resistor Rb is connected to one end of the analog-to-digital converter 141, and the other end of the analog-to-digital converter 141 is connected to one end of the controller 151, and is controlled.
  • the other end of the 151 is connected to the adjustable end of the adjustable resistor Rx.
  • the gamma reference voltage circuit 110 outputs a gamma reference voltage, and the gamma reference voltage filters the gamma reference voltage via the adjustable resistor Rx and the capacitor C, and outputs the filtered gamma reference voltage to the thin film transistor liquid crystal display 130.
  • the filtered gamma reference voltage is also divided by the first sampling resistor Ra and the second sampling resistor Rb to obtain a divided voltage. Since the divided voltage is part of the filtered gamma reference voltage, the divided voltage can also reflect the ripple of the filtered gamma reference voltage.
  • the analog divided voltage is input to the analog to digital converter 141 to convert the analog divided voltage into a digital signal.
  • the controller 151 compares the input digital signal with a comparison voltage previously stored in the controller 151, if the filtered gamma parameter If the ripple of the test voltage is relatively large, the digital signal will be larger than the maximum value of the comparison voltage, or the digital signal will be smaller than the minimum value of the comparison voltage. At this time, the controller 151 can adjust the resistance of the adjustable resistor Rx until the value of the digital signal input to the controller 151 is greater than the minimum value of the comparison voltage and smaller than the maximum value of the comparison voltage.
  • adjustable resistor Rx and the controller 151 can also be integrated in the gamma reference voltage circuit 110.
  • FIG. 3 is a circuit diagram of another gamma reference voltage ripple filter circuit provided by the present invention.
  • the gamma reference voltage ripple filtering circuit of this embodiment includes: a filtering module 120 , a detecting module 140 , a comparing module 150 , and an adjusting module 160 .
  • the filtering module 120 includes a first resistor R1, a first dividing capacitor C1, a second resistor R2, and a second dividing capacitor C2.
  • the detecting module 140 includes a third resistor R3 and a fourth resistor R4.
  • the comparing module 150 includes a first comparator. 151 and the second comparator 152, the adjustment module 160 includes an OR operator 161, a first switch K1, a second switch K2, a fifth resistor R5, and a third switch K3.
  • the first end of the first switch K1 is connected to the gamma reference voltage circuit 110, the second end of the first switch K1 is used to connect one end of the first resistor R1, and the other end of the first resistor R1 is connected to the first partial capacitor C1.
  • the common end of one end of the divided capacitor C1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is grounded, and the third resistor R3 and the fourth resistor R4 are The common terminal is connected to the positive terminal of the first comparator 151, the negative terminal of the first comparator 151 is used for inputting the first reference voltage, the output terminal of the first comparator 151 is connected to the first input terminal of the operator 161, and the third resistor is The common terminal of R3 and the fourth resistor R4 is connected to the negative terminal of the second comparator 152, the positive terminal of the second comparator 152 is used to input the second reference voltage, and the
  • the third end of the switch tube K1, or the output end of the arithmetic unit 161 is connected to the first end of the second switch tube K2, the second end of the second switch tube K2 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5
  • One end is connected to the power source VCC
  • the third end of the second switch tube K2 is grounded
  • the first end of the third switch tube K3 is used to connect the gamma reference voltage circuit 110
  • the second end of the second switch tube K2 is connected to the fifth resistor R5 and the Second switch tube K2
  • the third end of the third switch K3 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the second partial capacitor C2, and the other end of the second partial capacitor C2 is grounded
  • the second resistor R2 is connected to the second resistor R2.
  • the thin film transistor liquid crystal display 130 is connected to the common terminal of the second partial capacitor C2.
  • the first switch K1 is turned on, the second switch K2 is turned off, and the third switch is turned on. Therefore, the first resistor R1 and the first partial capacitor C1 are connected to the circuit, and the second resistor R2 and the second partial capacitor C2 are disconnected from the circuit. Therefore, after the gamma reference voltage circuit 110 outputs the gamma reference voltage, the gamma reference voltage is filtered through the first switch K1 and then through the first resistor R1 and the first partial capacitor C1. The filtered gamma reference voltage is output to the thin film transistor liquid crystal display 130. The filtered gamma reference voltage is also divided by the first sampling resistor R3 and the second sampling resistor R4 to obtain a divided voltage.
  • the divided voltage can also reflect the ripple of the filtered gamma reference voltage.
  • the divided voltages are input to the positive terminal of the first comparator 151 and the negative terminal of the second comparator 152, respectively. If the divided voltage input to the positive terminal of the first comparator 151 is greater than the first reference voltage input to the negative terminal of the first comparator 151, the first comparator 151 outputs a high level to the OR operator 161 if the first comparator is input.
  • the voltage dividing voltage at the positive terminal of 151 is smaller than the first reference voltage input from the negative terminal of the first comparator 151, and the first comparator 151 outputs a low level to the OR operator 161.
  • the second comparator 152 If the divided voltage input to the negative terminal of the second comparator 152 is greater than the second reference voltage input by the positive terminal of the second comparator 152, the second comparator 152 outputs a low level to the OR operator 161 if the second comparator is input.
  • the divided voltage of the negative terminal 152 is smaller than the second reference voltage input by the positive terminal of the second comparator 152, and the second comparator 152 outputs a high level to the OR operator 161. If the ripple of the filtered gamma reference voltage is relatively large, the first comparator 151 and/or the second comparator 152 may output a high level to the OR operator 161, or the operator 161 outputs a high level to the first The switch tube K1 and the third switch tube K3.
  • the first switch K1 is turned off by the high level outputted by the arithmetic unit 161, and the second switch K2 is turned on by the current generated by the power source VCC flowing through the fifth resistor R5. Therefore, the first resistor R1 is turned on. And the first partial capacitor C1 is disconnected from the circuit, and the second resistor R2 and the second partial capacitor C2 are connected to the circuit.
  • the gamma reference voltage circuit 110 outputs the gamma reference voltage through the second switch K2, it filters through the second resistor R2 and the second partial capacitor C2, and transmits the filtered gamma reference voltage to the thin film transistor liquid crystal display 130.
  • the filtering capability of the RC filter composed of the first resistor R1 and the first partial capacitor C1 is smaller than the second resistor R2 and the second fraction
  • the filtering capability of the RC filter composed of the capacitor C2 so when the ripple of the filtered gamma reference voltage is relatively large, switching to the RC filter composed of the second resistor R2 and the second partial capacitor C2 with relatively strong filtering capability It can effectively suppress the ripple in the filtered gamma reference voltage.
  • the filtering capability of the RC filter composed of the first resistor R1 and the first partial capacitor C1 is smaller than the filtering capability of the RC filter composed of the second resistor R2 and the second partial capacitor C2, so that the first resistor can be made.
  • the resistance of the value of R1 and the capacitance of the first partial capacitor C1 is smaller than the resistance of the second resistor R2 and the capacitance of the second partial capacitor C2.
  • the resistance of the first resistor is smaller than the resistance of the second resistor.
  • the capacitance of the first partial capacitor is equal to the capacitance of the second partial capacitor.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

一种gamma参考电压纹波过滤电路以及液晶显示器，包括滤波模块（120），滤波模块（120）用于接收gamma参考电压电路（110）输出的gamma参考电压，对gamma参考电压进行滤波，并将滤波后的gamma参考电压发送给薄膜晶体管液晶显示器（130），gamma参考电压纹波过滤电路还包括：检测模块（140），用于对滤波后的gamma参考电压进行检测以得到检测电压；比较模块（150），用于对检测电压进行比较，以获得比较结果；调整模块（160），用于根据比较结果调整滤波模块（120），使得滤波模块（120）输出的过滤后的gamma参考电压的纹波在预设范围内。上述方案能够稳定液晶两端压差，防止液晶反转角度不稳而产生flicker现象影响画质。

Description

gamma参考电压纹波过滤电路以及液晶显示器
本发明要求2015年12月01日递交的发明名称为“gamma参考电压纹波过滤电路以及液晶显示器”的申请号201510863666.4的在先申请优先权，上述
在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及液晶显示领域，尤其涉及一种gamma参考电压纹波过滤电路以及液晶显示器。
背景技术
薄膜晶体管液晶显示器的显示面板上具有多个像素单元，每个像素单元具有红色、绿色和蓝色三个子像素。每个子像素所呈现的亮度由gamma(伽马)参考电压所决定。gamma参考电压产生电路的作用是根据液晶显示器所要求的gamma曲线来设定gamma参考电压，作为薄膜晶体管液晶显示器进行灰度显示的参考电压。将各个gamma参考电压输入到薄膜晶体管液晶显示器的源极驱动器中，经过源极驱动器中的数模转换器，产生所有灰度电压。
gamma参考电压从gamma参考电压电路传输到薄膜晶体管液晶显示器的过程中，容易受到干扰而产生纹波，从而导致gamma参考电压产生失真。为了解决上述问题，现有技术在gamma参考电压电路与薄膜晶体管液晶显示器之间设置有LC滤波电路对gamma参考电压进行滤波。但是，由于每个像素单元的特性都不一样，所以每个像素单元的电容特性都不一样，所以，会响应到gamma参考电压滤波的效果。如果gamma参考电压的滤波的效果不够，则会导致液晶两端压差不稳，从而导致液晶反转角度不稳，产生flicker现象，影响画质。
发明内容
本发明实施例所要解决的技术问题在于，提供一种gamma参考电压纹波过滤电路以及液晶显示器，能够更好地过滤纹波电压，防止产生flicker现象。
本发明提供了一种gamma参考电压纹波过滤电路，包括滤波模块，所述滤波模块用于接收gamma参考电压电路输出的gamma参考电压，对所述gamma参考电压进行滤波，并将滤波后的gamma参考电压发送给薄膜晶体管液晶显示器，gamma参考电压纹波过滤电路还包括：检测模块，用于对滤波后的gamma参考电压进行检测以得到检测电压；比较模块，用于对所述检测电压进行比较，以获得比较结果；调整模块，用于根据所述比较结果调整所述滤波模块，使得所述滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内。
可选地，所述滤波模块包括可调电阻以及滤波电容，所述检测模块包括第一采样电阻、第二采样电阻以及模数转换器，所述比较模块以及所述调整模块集成在所述控制器中，所述可调电阻的一端连接gamma参考电压电路，所述可调电阻的另一端连接所述薄膜晶体管液晶显示器，所述滤波电容的一端连接所述可调变阻器的另一端与所述薄膜晶体管液晶显示器的公共端，所述滤波电容的另一端接地，所述第一采样电阻的一端连接所述可调变阻器的另一端与所述薄膜晶体管液晶显示器的公共端，所述第一采样电阻的另一端连接第二采样电阻的一端，所述第二采样电阻的另一端接地，所述第一采样电阻与所述第二采样电阻的公共端连接所述模数转换器的一端，所述模数转换器的另一端连接所述控制器的一端，所述控制器的另一端连接所述可调电阻的可调端，gamma参考电压经过所述可调电阻以及所述滤波电容的滤波后，得到滤波后的gamma参考电压，所述滤波后的gamma参考电压经过所述第一采样电阻和所述第二采样电阻的分压后，得到分压电压，所述分压电压经过所述模数转换器的转换后，得到数字信号，所述数字信号与存储在所述控制器中的比较电压进行比较，并根据比较的结果调整所述可调电阻的阻值，使得所述滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内。
可选地，所述可调电阻以及所述控制器集成在所述gamma参考电压电路中。
可选地，所述滤波模块包括第一电阻、第一分电容、第二电阻以及第二分电容，所述检测模块包括第三电阻以及第四电阻，所述比较模块包括第一比较器以及第二比较器，所述调整模块包括或运算器，第一开关管、第二开关管、 第五电阻以及第三开关管，所述第一开关管的第一端用于连接所述gamma参考电压电路，所述第一开关管的第二端用于连接所述第一电阻的一端，所述第一电阻的另一端连接所述第一分电容的一端，所述第一分电容的另一端接地，所述第一电阻的另一端与所述第一分电容的一端的公共端用于连接所述薄膜晶体管液晶显示器，所述第一电阻的另一端与所述第一分电容的一端的公共端连接所述第三电阻的一端，所述第三电阻的另一端连接所述第四电阻的一端，所述第四电阻的另一端接地，所述第三电阻与所述第四电阻的公共端连接所述第一比较器的正端，所述第一比较器的负端用于输入第一参考电压，所述第一比较器的输出端连接所述或运算器的第一输入端，所述第三电阻与所述第四电阻的公共端连接所述第二比较器的负端，所述第二比较器的正端用于输入第二参考电压，所述第二比较器的输出端连接所述或运算器的第二输入端，所述或运算器的输出端连接所述第一开关管的第三端，所述或运算器的输出端连接所述第二开关管的第一端，所述第二开关管的第二端连接所述第五电阻的一端，所述第五电阻的另一端接电源，所述第二开关管的第三端接地，所述第三开关管的第一端用于连接所述gamma参考电压电路，所述第二开关管的第二端连接所述第五电阻与所述第二开关管的公共端，所述第三开关管的第三端连接所述第二电阻的一端，所述第二电阻的另一端连接所述第二分电容的一端，所述第二分电容的另一端接地，所述第二电阻与所述第二分电容的公共端连接所述薄膜晶体管液晶显示器，其中，第一电阻与第一电容的滤波能力大于第二电阻与第二电容的滤波能力。
可选地，所述第一电阻的阻值小于第二电阻的阻值，第一分电容的容值等于第二分电容的容值。
本发明还提供了一种液晶显示器，包括液晶显示器以及底板，其中，所述液晶显示器包括gamma参考电压纹波过滤电路，所述gamma参考电压纹波过滤电路包括滤波模块，所述滤波模块用于接收gamma参考电压电路输出的gamma参考电压，对所述gamma参考电压进行滤波，并将滤波后的gamma参考电压发送给薄膜晶体管液晶显示器，所述gamma参考电压纹波过滤电路还包括：检测模块，用于对滤波后的gamma参考电压进行检测以得到检测电压；比较模块，用于对所述检测电压进行比较，以获得比较结果；调整模块， 用于根据所述比较结果调整所述滤波模块，使得所述滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内。
可选地，所述滤波模块包括可调电阻以及滤波电容，所述检测模块包括第一采样电阻、第二采样电阻以及模数转换器，所述比较模块以及所述调整模块集成在所述控制器中，所述可调电阻的一端连接gamma参考电压电路，所述可调电阻的另一端连接所述薄膜晶体管液晶显示器，所述滤波电容的一端连接所述可调变阻器的另一端与所述薄膜晶体管液晶显示器的公共端，所述滤波电容的另一端接地，所述第一采样电阻的一端连接所述可调变阻器的另一端与所述薄膜晶体管液晶显示器的公共端，所述第一采样电阻的另一端连接第二采样电阻的一端，所述第二采样电阻的另一端接地，所述第一采样电阻与所述第二采样电阻的公共端连接所述模数转换器的一端，所述模数转换器的另一端连接所述控制器的一端，所述控制器的另一端连接所述可调电阻的可调端，gamma参考电压经过所述可调电阻以及所述滤波电容的滤波后，得到滤波后的gamma参考电压，所述滤波后的gamma参考电压经过所述第一采样电阻和所述第二采样电阻的分压后，得到分压电压，所述分压电压经过所述模数转换器的转换后，得到数字信号，所述数字信号与存储在所述控制器中的比较电压进行比较，并根据比较的结果调整所述可调电阻的阻值，使得所述滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内。
可选地，所述可调电阻以及所述控制器集成在所述gamma参考电压电路中。
可选地，所述滤波模块包括第一电阻、第一分电容、第二电阻以及第二分电容，所述检测模块包括第三电阻以及第四电阻，所述比较模块包括第一比较器以及第二比较器，所述调整模块包括或运算器，第一开关管、第二开关管、第五电阻以及第三开关管，所述第一开关管的第一端用于连接所述gamma参考电压电路，所述第一开关管的第二端用于连接所述第一电阻的一端，所述第一电阻的另一端连接所述第一分电容的一端，所述第一分电容的另一端接地，所述第一电阻的另一端与所述第一分电容的一端的公共端用于连接所述薄膜晶体管液晶显示器，所述第一电阻的另一端与所述第一分电容的一端的公共端连接所述第三电阻的一端，所述第三电阻的另一端连接所述第四电阻的一端， 所述第四电阻的另一端接地，所述第三电阻与所述第四电阻的公共端连接所述第一比较器的正端，所述第一比较器的负端用于输入第一参考电压，所述第一比较器的输出端连接所述或运算器的第一输入端，所述第三电阻与所述第四电阻的公共端连接所述第二比较器的负端，所述第二比较器的正端用于输入第二参考电压，所述第二比较器的输出端连接所述或运算器的第二输入端，所述或运算器的输出端连接所述第一开关管的第三端，所述或运算器的输出端连接所述第二开关管的第一端，所述第二开关管的第二端连接所述第五电阻的一端，所述第五电阻的另一端接电源，所述第二开关管的第三端接地，所述第三开关管的第一端用于连接所述gamma参考电压电路，所述第二开关管的第二端连接所述第五电阻与所述第二开关管的公共端，所述第三开关管的第三端连接所述第二电阻的一端，所述第二电阻的另一端连接所述第二分电容的一端，所述第二分电容的另一端接地，所述第二电阻与所述第二分电容的公共端连接所述薄膜晶体管液晶显示器，其中，第一电阻与第一电容的滤波能力大于第二电阻与第二电容的滤波能力。
可选地，所述第一电阻的阻值小于第二电阻的阻值，第一分电容的容值等于第二分电容的容值。
与现有技术相比，本发明能够对gamma参考电压纹波过滤电路输出的电压进行检测，并根据检测电压进行比较从而得到比较结果，最后再根据比较结果调整滤波模块，使得滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内，从而到达稳定液晶两端压差，防止液晶反转角度不稳而产生flicker现象影响画质。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明提供的一种gamma参考电压纹波过滤电路的电路框图；
图2是本发明提供的一种gamma参考电压纹波过滤电路的电路图；
图3是本发明提供的另一种gamma参考电压纹波过滤电路的电路图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明的是，在本发明实施例中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本发明。在本发明实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。还应当理解，本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。
参阅图1，图1是本发明提供的一种gamma参考电压纹波过滤电路的电路框图。本发明的gamma参考电压纹波过滤电路包括：滤波模块120、检测模块140、比较模块150以及调整模块160。其中，gamma参考电压电路110连接滤波模块120的第一端，滤波模块120的第二端连接薄膜晶体管液晶显示器130。滤波模块120与薄膜晶体管液晶显示器130的公共端连接检测模块140的一端，检测模块140的另一端连接比较模块150的一端，比较模块150的另一端连接调整模块160的一端，调整模块160的另一端连接滤波模块120的第三端。
gamma参考电压电路110向滤波模块120输出gamma参考电压，滤波模块120接收到gamma参考电压后，对gamma参考电压进行滤波，并将滤波后的gamma参考电压发送给薄膜晶体管液晶显示器130。检测模块140接收滤波模块120输出的滤波后的gamma参考电压，并对滤波后的gamma参考电压进行检测以得到检测电压，并发送给比较模块150。比较模块150接收检测模块140发送的检测电压，并对检测电压进行比较，以获得比较结果，并将比较结果发送给调整模块160。调整模块160接收比较结果，并根据比较结果调整 滤波模块120，使得滤波模块120输出的过滤后的gamma参考电压的纹波在预设范围内。
与现有技术相比，本发明能够对gamma参考电压纹波过滤电路输出的电压进行检测，并根据检测电压进行比较从而得到比较结果，最后再根据比较结果调整滤波模块，使得滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内，从而到达稳定液晶两端压差，防止液晶反转角度不稳而产生flicker现象影响画质。
参阅图2，图2是本发明提供的一种gamma参考电压纹波过滤电路的电路图。请结合图1，本实施例的gamma参考电压纹波过滤电路包括：滤波模块120、检测模块140、比较模块150以及调整模块160。其中，滤波模块120包括可调电阻Rx以及滤波电容C，检测模块140包括第一采样电阻Ra、第二采样电阻Rb以及模数转换器141，比较模块150以及调整模块160集成在控制器151中，可调电阻Rx的一端连接gamma参考电压电路110，可调电阻Rx的另一端连接薄膜晶体管液晶显示器130，滤波电容C的一端连接可调变阻器Rx的另一端与薄膜晶体管液晶显示器130的公共端，滤波电容C的另一端接地，第一采样电阻Ra的一端连接可调变阻器Rx的另一端与薄膜晶体管液晶显示器130的公共端，第一采样电阻Ra的另一端连接第二采样电阻Rb的一端，第二采样电阻Rb的另一端接地，第一采样电阻Ra与第二采样电阻Rb的公共端连接模数转换器141的一端，模数转换器141的另一端连接控制器151的一端，控制器151的另一端连接可调电阻Rx的可调端。
gamma参考电压电路110输出gamma参考电压，gamma参考电压经由可调电阻Rx以及电容C对gamma参考电压进行过滤后，将过滤后的gamma参考电压输出到薄膜晶体管液晶显示器130。过滤后的gamma参考电压还经由第一采样电阻Ra以及第二采样电阻Rb进行分压以获得分压电压。由于分压电压是过滤后的gamma参考电压的一部分，所以，分压电压同样能够体现过滤后的gamma参考电压的纹波的情况。将模拟的分压电压输入到模数转换器141中，从而将模拟的分压电压转换为数字信号。控制器151将输入的数字信号与预先存储在控制器151中的比较电压进行比较，如果滤波后的gamma参 考电压的纹波比较大，则数字信号会比比较电压中的最大值大，或者数字信号会比比较电压中的最小值小。此时，控制器151可调整可调电阻Rx的阻值，直到输入到控制器151中的数字信号的值大于比较电压中的最小值且小于比较电压中的最大值。
可以理解的是，可调电阻Rx和控制器151也可以集成在gamma参考电压电路110中。
参阅图3，图3是本发明提供的另一种gamma参考电压纹波过滤电路的电路图。请结合图1，本实施例的gamma参考电压纹波过滤电路包括：滤波模块120、检测模块140、比较模块150以及调整模块160。其中，滤波模块120包括第一电阻R1、第一分电容C1、第二电阻R2以及第二分电容C2，检测模块140包括第三电阻R3以及第四电阻R4，比较模块150包括第一比较器151以及第二比较器152，调整模块160包括或运算器161，第一开关管K1、第二开关管K2、第五电阻R5以及第三开关管K3。
第一开关管K1的第一端用于连接gamma参考电压电路110，第一开关管K1的第二端用于连接第一电阻R1的一端，第一电阻R1的另一端连接第一分电容C1的一端，第一分电容C1的另一端接地，第一电阻R1的另一端与第一分电容C1的一端的公共端用于连接薄膜晶体管液晶显示器130，第一电阻R1的另一端与第一分电容C1的一端的公共端连接第三电阻R3的一端，第三电阻R3的另一端连接第四电阻R4的一端，第四电阻R4的另一端接地，第三电阻R3与第四电阻R4的公共端连接第一比较器151的正端，第一比较器151的负端用于输入第一参考电压，第一比较器151的输出端连接或运算器161的第一输入端，第三电阻R3与第四电阻R4的公共端连接第二比较器152的负端，第二比较器152的正端用于输入第二参考电压，第二比较器152的输出端连接或运算器161的第二输入端，或运算器161的输出端连接第一开关管K1的第三端，或运算器161的输出端连接第二开关管K2的第一端，第二开关管K2的第二端连接第五电阻R5的一端，第五电阻R5的另一端接电源VCC，第二开关管K2的第三端接地，第三开关管K3的第一端用于连接gamma参考电压电路110，第二开关管K2的第二端连接第五电阻R5与第二开关管K2的 公共端，第三开关管K3的第三端连接第二电阻R2的一端，第二电阻R2的另一端连接第二分电容C2的一端，第二分电容C2的另一端接地，第二电阻R2与第二分电容C2的公共端连接薄膜晶体管液晶显示器130。
在起始工作状态，第一开关管K1导通，第二开关管K2截止，以及第三开关管导通。所以，第一电阻R1以及第一分电容C1接入到电路中，第二电阻R2以及第二分电容C2断开与电路的连接。所以，gamma参考电压电路110输出gamma参考电压后，gamma参考电压经由第一开关管K1后，再经第一电阻R1以及第一分电容C1对gamma参考电压进行过滤。过滤后的gamma参考电压输出到薄膜晶体管液晶显示器130。过滤后的gamma参考电压还经由第一采样电阻R3以及第二采样电阻R4进行分压以获得分压电压。由于分压电压是过滤后的gamma参考电压的一部分，所以，分压电压同样能够体现过滤后的gamma参考电压的纹波的情况。分压电压被分别输入到第一比较器151的正端以及第二比较器152的负端。如果输入第一比较器151正端的分压电压大于第一比较器151的负端输入的第一参考电压，则第一比较器151输出高电平到或运算器161，如果输入第一比较器151正端的分压电压小于第一比较器151的负端输入的第一参考电压，则第一比较器151输出低电平到或运算器161。如果输入第二比较器152负端的分压电压大于第二比较器152的正端输入的第二参考电压，则第二比较器152输出低电平到或运算器161，如果输入第二比较器152负端的分压电压小于第二比较器152的正端输入的第二参考电压，则第二比较器152输出高电平到或运算器161。如果滤波后的gamma参考电压的纹波比较大，则第一比较器151和/或第二比较器152会输出高电平到或运算器161，则或运算器161输出高电平至第一开关管K1以及第三开关管K3。第一开关管K1在或运算器161输出的高电平的作用下截止，第二开关管K2在流经第五电阻R5的电源VCC产生的电流的作用下导通，所以，第一电阻R1以及第一分电容C1断开与电路的连接，第二电阻R2以及第二分电容C2接入到电路中。gamma参考电压电路110输出gamma参考电压经过第二开关管K2后，经由第二电阻R2以及第二分电容C2进行滤波，并将滤波后的gamma参考电压发送给薄膜晶体管液晶显示器130。由于第一电阻R1以及第一分电容C1组成的RC滤波器的滤波能力小于第二电阻R2以及第二分 电容C2组成的RC滤波器的滤波能力，所以，当滤波后的gamma参考电压的纹波比较大时，则切换到滤波能力比较强的第二电阻R2以及第二分电容C2组成的RC滤波器，能够有效地抑制滤波后的gamma参考电压中的纹波。
可以理解的是，要使得第一电阻R1以及第一分电容C1组成的RC滤波器的滤波能力小于第二电阻R2以及第二分电容C2组成的RC滤波器的滤波能力，可以令第一电阻R1的阻值以及第一分电容C1的容值的乘积小于第二电阻R2的阻值以及第二分电容C2的容值，例如，令第一电阻的阻值小于第二电阻的阻值，第一分电容的容值等于第二分电容的容值。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所揭露的仅为本发明一种较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (10)

  1. 一种gamma参考电压纹波过滤电路，包括滤波模块，所述滤波模块用于接收gamma参考电压电路输出的gamma参考电压，对所述gamma参考电压进行滤波，并将滤波后的gamma参考电压发送给薄膜晶体管液晶显示器，其特征在于，gamma参考电压纹波过滤电路还包括：
    检测模块，用于对滤波后的gamma参考电压进行检测以得到检测电压；
    比较模块，用于对所述检测电压进行比较，以获得比较结果；
    调整模块，用于根据所述比较结果调整所述滤波模块，使得所述滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内。
  2. 根据权利要求1所述的电路，其特征在于，所述滤波模块包括可调电阻以及滤波电容，所述检测模块包括第一采样电阻、第二采样电阻以及模数转换器，所述比较模块以及所述调整模块集成在所述控制器中，所述可调电阻的一端连接gamma参考电压电路，所述可调电阻的另一端连接所述薄膜晶体管液晶显示器，所述滤波电容的一端连接所述可调变阻器的另一端与所述薄膜晶体管液晶显示器的公共端，所述滤波电容的另一端接地，所述第一采样电阻的一端连接所述可调变阻器的另一端与所述薄膜晶体管液晶显示器的公共端，所述第一采样电阻的另一端连接第二采样电阻的一端，所述第二采样电阻的另一端接地，所述第一采样电阻与所述第二采样电阻的公共端连接所述模数转换器的一端，所述模数转换器的另一端连接所述控制器的一端，所述控制器的另一端连接所述可调电阻的可调端，
    gamma参考电压经过所述可调电阻以及所述滤波电容的滤波后，得到滤波后的gamma参考电压，所述滤波后的gamma参考电压经过所述第一采样电阻和所述第二采样电阻的分压后，得到分压电压，所述分压电压经过所述模数转换器的转换后，得到数字信号，所述数字信号与存储在所述控制器中的比较电压进行比较，并根据比较的结果调整所述可调电阻的阻值，使得所述滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内。
  3. 根据权利要求2所述的电路，其特征在于，所述可调电阻以及所述控制器集成在所述gamma参考电压电路中。
  4. 根据权利要求1所述的电路，其特征在于，所述滤波模块包括第一电 阻、第一分电容、第二电阻以及第二分电容，所述检测模块包括第三电阻以及第四电阻，所述比较模块包括第一比较器以及第二比较器，所述调整模块包括或运算器，第一开关管、第二开关管、第五电阻以及第三开关管，
    所述第一开关管的第一端用于连接所述gamma参考电压电路，所述第一开关管的第二端用于连接所述第一电阻的一端，所述第一电阻的另一端连接所述第一分电容的一端，所述第一分电容的另一端接地，所述第一电阻的另一端与所述第一分电容的一端的公共端用于连接所述薄膜晶体管液晶显示器，所述第一电阻的另一端与所述第一分电容的一端的公共端连接所述第三电阻的一端，所述第三电阻的另一端连接所述第四电阻的一端，所述第四电阻的另一端接地，所述第三电阻与所述第四电阻的公共端连接所述第一比较器的正端，所述第一比较器的负端用于输入第一参考电压，所述第一比较器的输出端连接所述或运算器的第一输入端，所述第三电阻与所述第四电阻的公共端连接所述第二比较器的负端，所述第二比较器的正端用于输入第二参考电压，所述第二比较器的输出端连接所述或运算器的第二输入端，所述或运算器的输出端连接所述第一开关管的第三端，所述或运算器的输出端连接所述第二开关管的第一端，所述第二开关管的第二端连接所述第五电阻的一端，所述第五电阻的另一端接电源，所述第二开关管的第三端接地，所述第三开关管的第一端用于连接所述gamma参考电压电路，所述第二开关管的第二端连接所述第五电阻与所述第二开关管的公共端，所述第三开关管的第三端连接所述第二电阻的一端，所述第二电阻的另一端连接所述第二分电容的一端，所述第二分电容的另一端接地，所述第二电阻与所述第二分电容的公共端连接所述薄膜晶体管液晶显示器，其中，第一电阻与第一电容的滤波能力大于第二电阻与第二电容的滤波能力。
  5. 根据权利要求4所述的电路，其特征在于，所述第一电阻的阻值小于第二电阻的阻值，第一分电容的容值等于第二分电容的容值。
  6. 一种液晶显示器，其特征在于，包括液晶显示器以及底板，其中，所述液晶显示器包括gamma参考电压纹波过滤电路，所述gamma参考电压纹波过滤电路包括滤波模块，所述滤波模块用于接收gamma参考电压电路输出的gamma参考电压，对所述gamma参考电压进行滤波，并将滤波后的gamma 参考电压发送给薄膜晶体管液晶显示器，所述gamma参考电压纹波过滤电路还包括：
    检测模块，用于对滤波后的gamma参考电压进行检测以得到检测电压；
    比较模块，用于对所述检测电压进行比较，以获得比较结果；
    调整模块，用于根据所述比较结果调整所述滤波模块，使得所述滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内。
  7. 根据权利要求6所述的液晶显示器，其特征在于，所述滤波模块包括可调电阻以及滤波电容，所述检测模块包括第一采样电阻、第二采样电阻以及模数转换器，所述比较模块以及所述调整模块集成在所述控制器中，所述可调电阻的一端连接gamma参考电压电路，所述可调电阻的另一端连接所述薄膜晶体管液晶显示器，所述滤波电容的一端连接所述可调变阻器的另一端与所述薄膜晶体管液晶显示器的公共端，所述滤波电容的另一端接地，所述第一采样电阻的一端连接所述可调变阻器的另一端与所述薄膜晶体管液晶显示器的公共端，所述第一采样电阻的另一端连接第二采样电阻的一端，所述第二采样电阻的另一端接地，所述第一采样电阻与所述第二采样电阻的公共端连接所述模数转换器的一端，所述模数转换器的另一端连接所述控制器的一端，所述控制器的另一端连接所述可调电阻的可调端，
    gamma参考电压经过所述可调电阻以及所述滤波电容的滤波后，得到滤波后的gamma参考电压，所述滤波后的gamma参考电压经过所述第一采样电阻和所述第二采样电阻的分压后，得到分压电压，所述分压电压经过所述模数转换器的转换后，得到数字信号，所述数字信号与存储在所述控制器中的比较电压进行比较，并根据比较的结果调整所述可调电阻的阻值，使得所述滤波模块输出的过滤后的gamma参考电压的纹波在预设范围内。
  8. 根据权利要求7所述的液晶显示器，其特征在于，所述可调电阻以及所述控制器集成在所述gamma参考电压电路中。
  9. 根据权利要求6所述的液晶显示器，其特征在于，所述滤波模块包括第一电阻、第一分电容、第二电阻以及第二分电容，所述检测模块包括第三电阻以及第四电阻，所述比较模块包括第一比较器以及第二比较器，所述调整模块包括或运算器，第一开关管、第二开关管、第五电阻以及第三开关管，
    所述第一开关管的第一端用于连接所述gamma参考电压电路，所述第一开关管的第二端用于连接所述第一电阻的一端，所述第一电阻的另一端连接所述第一分电容的一端，所述第一分电容的另一端接地，所述第一电阻的另一端与所述第一分电容的一端的公共端用于连接所述薄膜晶体管液晶显示器，所述第一电阻的另一端与所述第一分电容的一端的公共端连接所述第三电阻的一端，所述第三电阻的另一端连接所述第四电阻的一端，所述第四电阻的另一端接地，所述第三电阻与所述第四电阻的公共端连接所述第一比较器的正端，所述第一比较器的负端用于输入第一参考电压，所述第一比较器的输出端连接所述或运算器的第一输入端，所述第三电阻与所述第四电阻的公共端连接所述第二比较器的负端，所述第二比较器的正端用于输入第二参考电压，所述第二比较器的输出端连接所述或运算器的第二输入端，所述或运算器的输出端连接所述第一开关管的第三端，所述或运算器的输出端连接所述第二开关管的第一端，所述第二开关管的第二端连接所述第五电阻的一端，所述第五电阻的另一端接电源，所述第二开关管的第三端接地，所述第三开关管的第一端用于连接所述gamma参考电压电路，所述第二开关管的第二端连接所述第五电阻与所述第二开关管的公共端，所述第三开关管的第三端连接所述第二电阻的一端，所述第二电阻的另一端连接所述第二分电容的一端，所述第二分电容的另一端接地，所述第二电阻与所述第二分电容的公共端连接所述薄膜晶体管液晶显示器，其中，第一电阻与第一电容的滤波能力大于第二电阻与第二电容的滤波能力。
  10. 根据权利要求9所述的液晶显示器，其特征在于，所述第一电阻的阻值小于第二电阻的阻值，第一分电容的容值等于第二分电容的容值。
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