WO2013177911A1 - 伽马参考电压的设定方法、装置、驱动电路及显示装置 - Google Patents

伽马参考电压的设定方法、装置、驱动电路及显示装置 Download PDF

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Publication number
WO2013177911A1
WO2013177911A1 PCT/CN2012/085984 CN2012085984W WO2013177911A1 WO 2013177911 A1 WO2013177911 A1 WO 2013177911A1 CN 2012085984 W CN2012085984 W CN 2012085984W WO 2013177911 A1 WO2013177911 A1 WO 2013177911A1
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Prior art keywords
gamma reference
reference voltage
voltage
liquid crystal
feedback
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PCT/CN2012/085984
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English (en)
French (fr)
Inventor
柳在健
谢畅
谷新
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京东方科技集团股份有限公司
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Priority to US14/128,733 priority Critical patent/US9171510B2/en
Publication of WO2013177911A1 publication Critical patent/WO2013177911A1/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
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—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
    • G09G3/006—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
    • 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
    • G09G2320/0204—Compensation of DC component across the pixels in flat panels
    • 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
    • G09G2320/0219—Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
    • 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
    • G09G2320/0257—Reduction of after-image effects
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to a method, a device, a driving circuit, and a display device for setting a gamma reference voltage. Background technique
  • liquid crystal display products are being used more and more widely.
  • people's awareness of energy conservation increases, people's performance requirements for low power consumption of liquid crystal display products are also increasing.
  • the gamma reference voltage when the liquid crystal display device is lowered for the gamma reference voltage to be capacitively coupled, the gamma reference voltage is not lower than the driving voltage value, and a feedback is set when the gamma reference voltage of different gray levels is set. The voltage is added to the gamma reference voltage of different gray levels, thereby ensuring that the display quality of the liquid crystal display device is not affected.
  • the gamma reference voltages of different gray levels are reduced when capacitive coupling occurs, the values of the reduction are different, so the feedback voltages to be added are also different.
  • the gamma reference voltages of different gray levels are added to one.
  • the feedback voltage which is the maximum value of the feedback voltages to be added in different gray levels, so that the gamma reference voltage corresponding to the partial gray scale is larger than the actual required gamma reference voltage, thus increasing the driving of the display device
  • the voltage which increases the power consumption. Summary of the invention
  • Embodiments of the present invention provide a method, a device, a driving circuit, and a display device for setting a gamma reference voltage, which are used to reduce a driving voltage of a display device and reduce power consumption by resetting a gamma reference voltage of the display device.
  • a method for setting a gamma reference voltage comprising: obtaining a dielectric constant of a liquid crystal capacitor according to a first gamma reference voltage; obtaining a value of the liquid crystal capacitor according to a dielectric constant of the liquid crystal capacitor; The value of the feedback voltage is obtained, the second gamma reference voltage is obtained according to the feedback voltage, and the first gamma reference voltage is updated to the second gamma reference voltage.
  • a gamma reference voltage setting device comprising: obtaining a dielectric constant unit for acquiring a dielectric constant of a liquid crystal capacitor according to a first gamma reference voltage; acquiring a liquid crystal capacitor unit for a dielectric constant of the liquid crystal capacitor to obtain a value of the liquid crystal capacitor; a gamma reference voltage unit configured to obtain a feedback voltage according to the value of the liquid crystal capacitor, and obtain a second gamma reference voltage according to the feedback voltage, and The first gamma reference voltage is updated to the second gamma reference voltage.
  • a driving circuit comprising a gamma reference voltage setting device, wherein the gamma reference voltage setting device is the gamma reference voltage setting device.
  • a display device comprising a gamma reference voltage setting device, wherein the gamma reference voltage setting device is the gamma reference voltage setting device.
  • the embodiment of the invention provides a method, a device and a driving circuit for setting a gamma reference voltage.
  • the liquid crystal capacitor is obtained by acquiring a dielectric constant of the liquid crystal capacitor according to the first gamma reference voltage, and obtaining a feedback according to the value of the liquid crystal capacitor. a voltage, obtaining a value of the second gamma reference voltage according to the feedback voltage, and updating the first gamma reference voltage to the second gamma reference voltage, so that the feedback voltages of the different gray scales added to the gamma reference voltage are different, so that at least one gray The gamma reference voltage corresponding to the order is lowered.
  • the gamma reference voltage corresponding to the at least one gray scale is lowered, and the gamma reference voltage of the display device is lowered by resetting the gamma reference voltage of the display device, thereby realizing the reduction of the display device Drive voltage, reducing power consumption.
  • FIG. 1 is a schematic diagram of a method for setting a gamma reference voltage according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of another method for setting a gamma reference voltage according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of another gamma reference voltage setting device according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural view of the gamma reference voltage unit shown in FIG. 4;
  • FIG. 6 is another structural diagram of the gamma reference voltage unit shown in FIG. 4.
  • FIG. 7 is an embodiment of the present invention.
  • a schematic diagram of a gray scale and transmittance curve is provided;
  • FIG. 8 is a schematic diagram of a voltage-transmittance (VT) curve according to an embodiment of the present invention.
  • An embodiment of the present invention provides a method for setting a gamma reference voltage, as shown in FIG. 1, including:
  • the driving voltage includes a gamma reference voltage.
  • the first gamma reference voltage refers to a gamma reference voltage in the driving voltage in the prior art, that is, a gamma reference voltage before updating in the driving voltage.
  • the dielectric constant of the liquid crystal capacitor under the first gamma reference voltage is measured by the measuring instrument according to the first gamma reference voltage.
  • the driving voltage when the driving voltage is large, the value of the liquid crystal capacitor is also large, the driving voltage is small, and the value of the corresponding liquid crystal capacitor is also small, and the driving voltage values corresponding to different gray levels are different, and different gray levels are different.
  • the values of the corresponding liquid crystal capacitors are also different. Since the liquid crystal capacitor is a parallel plate capacitor, after the liquid crystal capacitor is formed, the facing area of the liquid crystal capacitor and the distance between the two plates are constant, so the liquid crystal capacitor changes the dielectric constant so that the value of the liquid crystal capacitor changes according to the driving voltage. And change.
  • the values of the liquid crystal capacitors corresponding to different gray levels are different, that is, the dielectric constants corresponding to different gray levels are different. Different gray levels correspond to different first gamma reference voltages, so the dielectric constants corresponding to different first gamma reference voltages are different.
  • C iC is a liquid crystal capacitor
  • a liquid crystal capacitor a liquid crystal capacitor
  • f is the dielectric constant of the liquid crystal capacitor
  • S is the facing area of the liquid crystal capacitor
  • d is the distance between the two electrodes of the liquid crystal capacitor.
  • the second gamma reference voltage is a gamma reference voltage corresponding to the actual gray scale, and is a gamma reference voltage to be set in the driving voltage.
  • the second gamma reference voltage is less than or equal to the first reference voltage.
  • the liquid crystal capacitance C iC increases, the driving voltage is small, and the liquid crystal capacitance C iC decreases.
  • the gamma reference voltage can be adjusted by adjusting the feedback voltage ⁇ to reduce the driving voltage and reduce the power consumption.
  • An embodiment of the present invention provides a method for setting a gamma reference voltage, which obtains a value of a liquid crystal capacitor by acquiring a dielectric constant of a liquid crystal capacitor according to a first gamma reference voltage, and obtains a feedback voltage according to a value of the liquid crystal capacitor, according to The feedback voltage acquires the value of the second gamma reference voltage, and updates the first gamma reference voltage to the second gamma reference voltage such that the feedback voltages of the different gray scales added to the gamma reference voltage are different.
  • the gamma reference voltage reduces the overall drive voltage and reduces power consumption.
  • Another embodiment of the present invention provides a method for setting a gamma reference voltage. As shown in FIG. 2, the method includes:
  • all the gray levels corresponding to the liquid crystal display device are divided into different gray scale regions.
  • the first gamma reference voltage corresponding to different gray levels may be determined first, and then all gray levels are divided into different gray level regions.
  • the gray scales L0-L63 may be set to the grayscale region Q1
  • the grayscales L64-L127 may be set to the grayscale region Q2
  • the grayscales L128-L255 may be set to the grayscale region Q3, and the grayscale region
  • the feedback voltages corresponding to Ql, Q2 and Q3 are AV pl , ⁇ ⁇ ⁇ 2 , ⁇ v p3 .
  • a grayscale region includes at least one grayscale, and each of the first gamma reference voltages corresponds to at least one different grayscale.
  • the respective first gamma reference voltages may be generated using a first gamma reference voltage generating circuit.
  • Output represents the brightness output value required for the thin film transistor liquid crystal display panel
  • Input represents the input voltage value
  • Gamma represents the first gamma reference voltage.
  • the unit of voltage is volts (V)
  • the unit of transmittance is a percentage (%)
  • the unit of gray scale is a grade.
  • FIG. 7 and FIG. 8 are the gray scale and transmittance curves and the voltage-transmittance (VT) curves of the TN structure of the normally white mode, and the gray scales and penetrations of the TN structures in the normally black mode.
  • the overshoot curve and the voltage-transmittance (VT) curve are not shown.
  • the first gamma reference voltage is obtained based on the gray scale and transmittance curves and the voltage-transmittance (V-T) curve, and the present invention does not limit the mode of the TN structure.
  • step 201 all gray scales are divided into different gray scale regions, and the method for obtaining the dielectric constant of the liquid crystal capacitor in a gray scale region is:
  • the dielectric constants of the liquid crystal capacitors corresponding to different gray levels are obtained according to the first gamma reference voltage corresponding to different gray levels in one of the gray scale regions, and the different dielectrics in the gray scale region are obtained.
  • the average of the constants are obtained according to the first gamma reference voltage corresponding to different gray levels in one of the gray scale regions, and the different dielectrics in the gray scale region are obtained. The average of the constants.
  • gray levels are divided into three gray-scale regions, which are Q1, Q2, and Q3, respectively.
  • Obtaining a plurality of different liquid crystal capacitors under different first gamma reference voltages in the gray scale region Q1 according to different first gamma reference voltages corresponding to different gray scales L0-L63 in the gray scale region Q1 The electric constant, and the average value of the dielectric constant of the liquid crystal capacitor in Q1 is obtained.
  • 256 gray levels are divided into three gray scale regions, and 256 gray scales may be divided into four gray scale regions or five gray scale regions, which is not limited by the present invention. .
  • the method for obtaining the value of the liquid crystal capacitor corresponding to the gray-scale region is: obtaining the value of the liquid crystal capacitor corresponding to the gray-scale region according to the average value of the dielectric constant corresponding to the gray-scale region.
  • the dielectric constant obtained in step 202 is the dielectric constant obtained in step 202. If the dielectric constant obtained in step 202 is a dielectric constant corresponding to a gray scale in the gray scale region, then the dielectric constant corresponding to the gray scale; if the dielectric constant obtained in step 202 is gray scale The average of the different dielectric constants in the region is the average of the different dielectric constants in this gray region.
  • the first method is to obtain the feedback voltage corresponding to a gray-scale region and directly obtain the reference voltage.
  • a second gamma reference voltage corresponding to the grayscale region and updating all of the first gamma reference voltages of the grayscale region to a second gamma reference voltage.
  • the second method is to determine the corresponding feedback voltage of each gray-scale region, determine the gray-scale region to which the respective feedback voltage belongs according to each feedback voltage, and obtain a second gamma reference voltage corresponding to each gray-scale region, and All first gamma reference voltages of the gray-scale region to which the feedback voltage belongs are correspondingly updated to the second gamma reference voltage.
  • the first method specifically, obtaining a feedback voltage according to the value of the liquid crystal capacitor corresponding to a gray-scale region acquired in step 203, and acquiring a second gamma reference voltage corresponding to the gray-scale region according to the feedback voltage, All the first gamma reference voltages in the gray-scale region are updated to a second gamma reference voltage, and the feedback voltage corresponding to the next gray-scale region is obtained, and the second voltage is obtained according to the feedback voltage.
  • the gamma reference voltage updates all of the first gamma reference voltages of the gray scale region to the second gamma reference voltage until all first gamma reference voltages of the last gray level region are updated to the second gamma reference voltage.
  • the value of the liquid crystal capacitor corresponding to the gray-scale region Q1 is obtained in step 203.
  • the feedback voltage corresponding to the gray-scale region Q2 is obtained, and the gray-scale is obtained according to the feedback voltage corresponding to the gray-scale region Q2.
  • the second gamma reference voltage corresponding to the region Q2, and all the first gamma reference voltages of the gray-scale region Q2 are updated to the second gamma reference voltage.
  • the feedback voltage corresponding to the gray-scale region Q3 is obtained, and the gray-scale is obtained according to the feedback voltage corresponding to the gray-scale region Q3.
  • the second gamma reference voltage corresponding to the region Q3, and all the first gamma reference voltages of the grayscale region Q3 are updated to the second gamma reference voltage.
  • the method before acquiring the second gamma reference voltage according to the feedback voltage, the method further includes: determining, according to each feedback voltage, a gray-scale region to which the respective feedback voltage belongs.
  • the feedback voltages corresponding to the different gray-scale regions are obtained according to the values of the liquid crystal capacitors corresponding to the different gray-scale regions, and the gray-scale regions to which the respective feedback voltages belong are determined according to the respective feedback voltages, and the respective feedback voltages are obtained according to the respective feedback voltages.
  • a second gamma reference voltage corresponding to the gray-scale region to which each feedback voltage belongs, and all first gamma references in the gray-scale region to which the respective feedback voltages belong The voltage is updated to the second gamma reference voltage.
  • the feedback voltage AV pl corresponding to the gray-scale region Q1 is obtained by the formula c, +c r +ccountry;
  • each gray level region is obtained according to the formula ⁇ + eight ⁇
  • the second gamma reference voltage corresponding to Ql, Q2, and Q3 finally updates all the first gamma reference voltages in each of the gray scale regions Q1, Q2, and Q3 to the second gamma reference voltage.
  • the corresponding feedback voltage is AV pl
  • the horse reference voltage is updated to a second gamma reference voltage.
  • the corresponding feedback voltage is AV p2
  • the second gamma reference voltage corresponding to the gray-scale region Q2 is obtained, and all the pixels in the gray-scale region Q2 are obtained.
  • a gamma reference voltage is updated to a second gamma reference voltage.
  • the corresponding feedback voltage is ⁇ V p3
  • the voltage is updated to a second gamma reference voltage.
  • the person is a proportional relationship.
  • the driving voltage is large, the liquid crystal capacitance C iC increases, the driving voltage is small, and the liquid crystal capacitance C iC decreases.
  • the gamma reference voltage can be adjusted by adjusting the feedback voltage ⁇ to reduce the driving voltage and reduce the power consumption.
  • the driving voltage at L0 is the largest, that is, the driving voltage of the gray-scale region Q1 is the largest, so the corresponding liquid crystal capacitance is the largest, so the ⁇ corresponding to the gray-scale region Q1 is the smallest; conversely, the gray-scale region Q3 region The corresponding AVp 3 is the largest.
  • the driving voltage at L0 is the smallest, that is, the driving voltage of the gray-scale region Q1 is the smallest, so the corresponding liquid crystal capacitance is the smallest, so the ⁇ ⁇ corresponding to the gray-scale region Q1 is the largest;
  • the A Vp 3 corresponding to the Q3 region of the step region is the smallest.
  • Gp + 2 G " V com + AV p - ⁇ , when the common voltage is constant, when the feedback voltage A Vp is large, the gamma reference voltage is large, and when the feedback voltage A Vp is small, the gamma reference The voltage is also small. Therefore, after updating the first gamma reference voltage in the gray-scale region Q1 to the second gamma reference voltage, the gamma reference voltage in the gray-scale region Q1 is the largest, and correspondingly, the gamma in the gray-scale region Q3. The horse has the lowest reference voltage.
  • the gamma reference voltage of different gray-scale regions can reach the expected value set by itself in order to ensure that the voltage is reduced after the capacitive coupling occurs, so the gamma reference voltages of different gray-scale regions are added.
  • the second gamma reference voltage mentioned in the embodiment of the present invention is calculated according to the actual situation of different gray levels, so the feedback voltage A Vp is compared with the previous original gamma reference voltage (the first gamma The feedback voltage A Vp corresponding to the reference voltage is reduced, so that power consumption can be reduced.
  • the value of the second gamma reference voltage corresponding to at least one grayscale is lower than the value of the first gamma reference voltage, thereby reducing Power consumption.
  • the added feedback voltage is also different, so that the gamma corresponding to at least one gray scale is reduced, and the power consumption is reduced.
  • the effect of the feedback voltage ⁇ V is used to calculate a new gamma reference voltage value based on the feedback voltage ⁇ V value in different gray scale regions.
  • the gamma reference voltage value in different gray scale regions is measured, the dielectric constant of the liquid crystal is measured, and then the dielectric constant of the different liquid crystal is obtained to obtain different liquid crystal capacitors Clc, and then the different liquid crystal capacitors Clc are Different feedback voltages A Vp are determined, and the new feedback voltage ⁇ Vp determines the new gamma reference voltage value.
  • the end result is a gamma reference voltage adjustment.
  • the new gamma reference voltage value (the second gamma reference voltage) is obtained by a series of operations through the original gamma reference voltage value (the first gamma reference voltage) before the adjustment, the gamma reference voltage The value is lower than the original gamma reference voltage value, which reduces power consumption. If the operation, the obtained gamma reference voltage value should be consistent with the new gamma reference voltage value, basically no longer, if there is a change, we can perform multiple such operations, step by step, to achieve a more accurate gamma. Reference voltage value.
  • An embodiment of the present invention provides a method for setting a gamma reference voltage.
  • the first gamma reference voltage obtains the dielectric constant of the liquid crystal capacitor, and obtains an average value of the dielectric constant, and obtains the value of the liquid crystal capacitor corresponding to the gray-scale region according to the average value of the dielectric constant corresponding to the gray-scale region, and according to The value of the liquid crystal capacitor corresponding to the gray-scale region acquires a feedback voltage corresponding to the gray-scale region, and obtains a value of the second gamma reference voltage corresponding to the gray-scale region according to the feedback voltage corresponding to the gray-scale region, and all the first in the gray-scale region
  • a gamma reference voltage is updated to a second gamma reference voltage such that feedback voltages of different gray scale regions are added to the gamma reference voltage.
  • the gamma reference voltage reduces the overall drive voltage and reduces power consumption.
  • the embodiment of the present invention provides a gamma reference voltage setting device, as shown in FIG. 3, comprising: obtaining a dielectric constant unit 301 for obtaining a dielectric constant of a liquid crystal capacitor according to a first gamma reference voltage.
  • the liquid crystal capacitor unit 302 is configured to obtain a value of the liquid crystal capacitor according to a dielectric constant of the liquid crystal capacitor.
  • c iC is the liquid crystal capacitor
  • £ is the dielectric constant of the liquid crystal capacitor
  • S is the facing area of the liquid crystal capacitor
  • d is the distance between the two electrodes of the liquid crystal capacitor.
  • a gamma reference voltage unit 303 configured to acquire a feedback voltage according to the value of the liquid crystal capacitor, acquire a second gamma reference voltage according to the feedback voltage, and update the first gamma reference voltage to the first Two gamma reference voltage.
  • the setting device of the gamma reference voltage as shown in FIG. 4, further includes:
  • the determining unit 304 is configured to determine a first gamma reference voltage corresponding to different gray levels.
  • the dividing unit 305 is configured to divide all gray levels into different gray level regions.
  • the obtaining dielectric constant unit 301 is specifically configured to: obtain a dielectric constant of a liquid crystal capacitor corresponding to different gray levels according to a first gamma reference voltage corresponding to different gray levels in one of the gray scale regions, and obtain the gray The average of the different dielectric constants in the order regions.
  • the acquiring liquid crystal capacitor unit 302 is specifically configured to obtain a value of the liquid crystal capacitor corresponding to the gray scale region according to an average value of the dielectric constant corresponding to the gray scale region.
  • the gamma reference voltage unit 303 includes: a first acquisition feedback voltage module 3031, a first acquisition second gamma reference voltage module 3032, and a first update module 3033.
  • the first acquisition feedback voltage module 3031 is configured to obtain a feedback voltage according to a value of a liquid crystal capacitor corresponding to the grayscale region.
  • the first acquiring second gamma reference voltage module 3032 is configured to acquire a second gamma reference voltage corresponding to the gray-scale region according to the feedback voltage acquired by the first acquisition feedback voltage module 3031.
  • the first update module 3033 is configured to update all first gamma reference voltages in the grayscale region to the second gamma reference voltage acquired by the first acquiring second gamma reference voltage module 3032. Two gamma reference voltage.
  • the set gamma reference voltage unit includes: a second acquisition feedback voltage module 3034, a second acquisition second gamma reference voltage module 3035, a second update module 3036, and a determination module 3037.
  • the second acquisition feedback voltage module 3034 is configured to obtain feedback voltages of respective gray-scale regions according to values of liquid crystal capacitors corresponding to the different gray-scale regions.
  • the determining module 3037 is configured to determine, according to each of the feedback voltages acquired by the second acquisition feedback voltage module 3034, a grayscale region to which each of the feedback voltages belongs.
  • the second acquiring second gamma reference voltage module 3035 is configured to acquire, according to each of the feedback voltages acquired by the second acquiring feedback voltage module 3034, a second gamma corresponding to a gray-scale region to which each of the feedback voltages belongs Reference voltage.
  • the second updating module 3036 is configured to: according to the second gamma reference voltage acquired by the second acquiring second gamma reference voltage module 3035, all the first gamma in the grayscale region to which each of the feedback voltages belongs The horse reference voltage is updated to the second gamma reference voltage.
  • the embodiment of the present invention further provides a driving circuit, including: a gamma reference voltage setting device, a driving voltage setting device, and a driving voltage output device, wherein the gamma reference voltage setting device is in the above embodiment.
  • a device for setting a gamma reference voltage includes, but is not limited to, a source drive circuit of the display device.
  • the source driving circuit is a circuit that drives a display panel data line with a voltage corresponding to a data signal received from the controller.
  • the source driving circuit includes a gamma reference voltage setting device for setting a gamma reference voltage corresponding to different gray levels, and transmitting the set gamma reference voltage to the driving voltage setting device, so that the driving voltage is set.
  • the determining device sets the received gamma reference voltage as a driving voltage, and sends the driving voltage to the driving voltage output device, so that the driving voltage output device outputs a driving voltage to drive the data line to generate a liquid crystal capacitor to deflect the liquid crystal.
  • the gamma reference voltage setting device obtains the value of the liquid crystal capacitor by acquiring the dielectric constant of the liquid crystal capacitor according to the first gamma reference voltage, and obtains the feedback voltage according to the value of the liquid crystal capacitor, and acquires the second gamma according to the feedback voltage.
  • the value of the horse reference voltage, and the first gamma reference voltage is updated to the second gamma reference voltage, so that the feedback voltages of the different gray scales added to the gamma reference voltage are different, so that the output of the gamma reference voltage setting device is different gray
  • the gamma reference voltages corresponding to the order at least one gray scale corresponds to a low gamma reference voltage.
  • the gamma reference voltage setting device sends the gamma reference voltage to the driving voltage setting device, and after the driving voltage setting device receives the gamma reference voltage, sets the gamma reference voltage as the driving voltage, and transmits the driving voltage To the driving voltage output device, the driving voltage output device outputs a driving voltage to drive the data line to generate a liquid crystal capacitor to deflect the liquid crystal.
  • the gamma reference voltage setting device Since the gamma reference voltage setting device has different feedback voltages for adding gamma reference voltages to different gray scales, the gamma reference voltage setting device sets the gamma reference voltage differently, and The horse reference voltage, so the driving voltage set by the driving voltage setting device is lower than the driving voltage set by the driving voltage setting device in the prior art, so that the gamma reference of the display device is made while satisfying the driving voltage of different brightness The voltage is lowered, thereby reducing the driving voltage of the display device and reducing power consumption.
  • the embodiment of the present invention further provides a display device including a gamma reference voltage setting device, and the gamma reference voltage setting device includes the gamma reference voltage setting device described in the above embodiment.
  • Embodiments of the present invention provide a method for setting a gamma reference voltage, a setting device, a driving circuit, and a display device, which obtain a value of a liquid crystal capacitor by acquiring a dielectric constant of a liquid crystal capacitor according to a first gamma reference voltage, and Obtaining a feedback voltage according to the value of the liquid crystal capacitor, obtaining a value of the second gamma reference voltage according to the feedback voltage, and updating the first gamma reference voltage to the second gamma reference voltage, so that different gray scales are added to the feedback of the gamma reference voltage
  • the voltages are different, so that the gamma reference voltage corresponding to at least one gray scale is lowered, and the gamma reference voltage of the display device is reset by resetting the gamma reference voltage corresponding to the at least one gray scale while satisfying the driving voltage of different brightness
  • the gamma reference voltage of the display device is lowered, thereby reducing the driving voltage of the display device and

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Abstract

提供了伽马参考电压的设定方法、装置及驱动电路。其用于通过重新设定显示装置的伽马参考电压，从而实现降低显示装置的驱动电压，降低功耗。所述方法包括：根据第一伽马参考电压获取液晶电容的介电常数（101）；根据所述液晶电容的介电常数获取所述液晶电容的值（102）；根据所述液晶电容的值获取回馈电压，根据所述回馈电压获取第二伽马参考电压，并将所述第一伽马参考电压更新为所述第二伽马参考电压（103）。本伽马参考电压的设定方法、装置及驱动电路适用于液晶显示器的生成与制造。

Description

伽马参考电压的设定方法、 装置、 驱动电路及显示装置 技术领域
本发明涉及液晶显示技术领域， 尤其涉及伽马参考电压的设定方法、 装 置、 驱动电路及显示装置。 背景技术
随着液晶显示技术的不断完善， 液晶显示产品越来越广泛的被使用。 随 着人们节能意识的增强，人们对液晶显示产品的低功耗的性能要求也越来越 高。 在现有技术中， 液晶显示装置为了伽马参考电压在发生电容耦合而降低 时， 保证伽马参考电压不低于驱动电压值， 在设定不同灰阶的伽马参考电压 时， 将一个回馈电压加入到不同灰阶的伽马参考电压中， 从而保证了不影响 液晶显示装置的显示质量。
由于不同灰阶的伽马参考电压在发生电容耦合而降低时， 降低的值是不 同的， 所以需要加入的回馈电压也是不同的， 现有技术中不同灰阶的伽马参 考电压都加入了一个回馈电压，此回馈电压是不同灰阶所需加入的回馈电压 中的最大值，使得部分灰阶所对应的伽马参考电压大于实际所需的伽马参考 电压， 这样增大了显示装置的驱动电压， 从而增大了功耗。 发明内容
本发明的实施例提供伽马参考电压的设定方法、 装置、 驱动电路及显示 装置， 用于通过重新设定显示装置的伽马参考电压， 从而实现降低显示装置 的驱动电压， 降低功耗。
为达到上述目的， 本发明的实施例釆用如下技术方案：
一种伽马参考电压的设定方法， 包括： 根据第一伽马参考电压获取液晶 电容的介电常数； 根据所述液晶电容的介电常数获取所述液晶电容的值； 根 据所述液晶电容的值获取回馈电压，根据所述回馈电压获取第二伽马参考电 压， 并将所述第一伽马参考电压更新为所述第二伽马参考电压。
一种伽马参考电压的设定装置， 包括： 获取介电常数单元， 用于根据第 一伽马参考电压获取液晶电容的介电常数； 获取液晶电容单元， 用于根据所 述液晶电容的介电常数获取液晶电容的值； 设定伽马参考电压单元， 用于根 据所述液晶电容的值获取回馈电压，根据所述回馈电压获取第二伽马参考电 压， 并将所述第一伽马参考电压更新为所述第二伽马参考电压。
一种驱动电路， 包括伽马参考电压的设定装置， 所述伽马参考电压的设 定装置为上述伽马参考电压的设定装置。
一种显示装置， 包括伽马参考电压的设定装置， 所述伽马参考电压的设 定装置为上述伽马参考电压的设定装置。
本发明实施例提供了伽马参考电压的设定方法、 装置及驱动电路， 通过 根据第一伽马参考电压获取液晶电容的介电常数， 获取液晶电容的值， 并根 据液晶电容的值获取回馈电压， 根据回馈电压获取第二伽马参考电压的值， 并将第一伽马参考电压更新为第二伽马参考电压，使得不同灰阶加入伽马参 考电压的回馈电压不同， 使得至少一个灰阶对应的伽马参考电压降低。 在满 足不同亮度的驱动电压的同时， 由于至少一个灰阶对应的伽马参考电压降 低， 通过重新设定显示装置的伽马参考电压， 使得显示装置的伽马参考电压 降低， 从而实现降低显示装置的驱动电压， 降低功耗。 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为本发明实施例提供的一种伽马参考电压的设定方法的示意图； 图 2为本发明实施例提供的另一种伽马参考电压的设定方法的示意图； 图 3 为本发明实施例提供的一种伽马参考电压的设定装置的结构示意 图；
图 4为本发明实施例提供的另一种伽马参考电压的设定装置的结构示意 图；
图 5为图 4所示的设定伽马参考电压单元的一种结构示意图； 图 6为图 4所示的设定伽马参考电压单元的另一种结构示意图； 图 7为本发明实施例提供的一种灰阶和透过率曲线的示意图； 图 8为本发明实施例提供的一种电压-透过率（V-T ) 曲线的示意图。 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做 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。
本发明实施例提供了一种伽马参考电压的设定方法，如图 1所示，包括：
101、 根据第一伽马参考电压获取液晶电容的介电常数。
其中， 驱动电压中包括伽马参考电压。 第一伽马参考电压是指现有技术 中驱动电压中的伽马参考电压， 即驱动电压中更新之前的伽马参考电压。
具体的， 根据第一伽马参考电压， 通过测量仪器测量第一伽马参考电压 下液晶电容的介电常数。
需要说明的是， 在 TN模式中， 驱动电压大时， 液晶电容的值也大， 驱 动电压小时，相应的液晶电容的值也小，不同的灰阶对应的驱动电压值不同， 则不同灰阶对应的液晶电容的值也不同。 由于液晶电容为平行板电容， 在液 晶电容制成后， 液晶电容的正对面积和两极板的距离是不变的， 所以液晶电 容通过改变其介电常数从而使得液晶电容的值根据驱动电压改变而改变。 不 同灰阶对应的液晶电容的值是不同的， 即不同灰阶对应的介电常数是不同 的。 不同灰阶对应不同第一伽马参考电压， 所以不同第一伽马参考电压对应 的介电常数是不同的。
102、 根据所述液晶电容的介电常数获取所述液晶电容的值。
具体的，根据公式 CiC = ^获取液晶电容的值。 其中， CiC是液晶电容， a
f是液晶电容的介电常数， S是液晶电容的正对面积， d是液晶电容的两电极 的距离。
103、 根据所述液晶电容的值获取回馈电压， 根据所述回馈电压获取第 二伽马参考电压， 并将所述第一伽马参考电压更新为所述第二伽马参考电 压。
C * AV , ,
具体的， 根据公式 = " 获取回馈电压; 其中， 是回馈 电压， Cgx是栅极源极电容， Δ^,是栅极高电压与栅极低电压之差， Crf是存 储电容， CiC是液晶电容。 根据公式^^ = _ + Δ 获取第二伽马参考电压； 其中， Gp是第二伽 马参考电压的正电压， Gn是第二伽马参考电压的负电压， Ve。m是公共电极电 压， 是回馈电压。
需要说明的是， 第二伽马参考电压是不同灰阶实际对应的伽马参考电 压， 是驱动电压中要设置的伽马参考电压。 第二伽马参考电压小于等于第一 参考电压。
需要说明的是， 回馈电压 的大小直接影响面板的驱动电压， 的计
C * AV L,
算公式为： AVp = ,根据公式可知 随液晶电容 CiC的变化而变 化。 在 TN模式中， 驱动电压大时， 液晶电容 CiC增大， 驱动电压小时， 液 晶电容 CiC减小。
由于存在上述关系， 可以通过调节反馈电压 Δ^ , 从而调整伽马参考电 压， 实现减小驱动电压， 降低功耗的目的。
本发明实施例提供了一种伽马参考电压的设定方法，通过根据第一伽马 参考电压获取液晶电容的介电常数， 获取液晶电容的值， 并根据液晶电容的 值获取回馈电压， 根据回馈电压获取第二伽马参考电压的值， 并将第一伽马 参考电压更新为第二伽马参考电压，使得不同灰阶加入伽马参考电压的回馈 电压不同。 根据不同灰阶的伽马参考电压在发生电容耦合而降低时， 降低的 值的不同， 加入的回馈电压也不同， 使得至少一个灰阶对应的伽马参考电压 降低，通过重新设定显示装置的伽马参考电压，从而使得整体驱动电压减小， 降低了功耗。
本发明实施例提供了另一种伽马参考电压的设定方法， 如图 2所示， 包 括：
201、 将所有灰阶划分为不同的灰阶区域。
具体的， 将液晶显示装置对应的所有灰阶分成不同的灰阶区域。
进一步地， 可以先确定不同灰阶所对应的第一伽马参考电压， 然后将所 有灰阶划分为不同的灰阶区域。
示例性的， 液晶显示装置中有 256个灰阶， 将 256个灰阶分成 3个灰阶 区域分别为 Ql , Q2 , Q3。 具体来说， 可以将灰阶 L0-L63设定为灰阶区域 Q1 , 将灰阶 L64-L127设定为灰阶区域 Q2 , 将灰阶 L128-L255设定为灰阶 区域 Q3 , 灰阶区域 Ql , Q2 , Q3对应的回馈电压分别为 A Vpl , Δ Υρ2, Δ vp3。
一个灰阶区域内包含至少一个灰阶， 每个第一伽马参考电压对应至少一个 不同的灰阶。 第一伽马参考电压的确定方法如下： 通过薄膜晶体管液晶显示 面板的灰阶和透过率曲线， 如图 7所示， 拟合出所需的第一伽马参考电压的 曲线； 再根据液晶材料的电压-透过率 （V-T ) 曲线， 如图 8所示， 根据公式 Output = InputGamma计算得到各个灰阶所对应的第一伽马参考电压值，得到各个 第一伽马参考电压值后可釆用第一伽马参考电压产生电路产生各个第一伽 马参考电压。其中， Output表示薄膜晶体管液晶显示面板需要的亮度输出值， Input表示输入电压值， Gamma表示第一伽马参考电压。 在图 7和图 8中， 电压 的单位是伏特（V ) , 透过率的单位是百分数(％), 灰阶的单位是等级。
需要说明的是， 将所有灰阶划分为不同的灰阶区域时， 将数值相近但不 同的第一伽马参考电压所对应的灰阶划分在一个灰阶区域内。
需要说明的是， 图 7与图 8的示意图为常白模式的 TN结构的灰阶和透 过率曲线和电压-透过率（V-T ) 曲线， 在常黑模式的 TN结构的灰阶和透过 率曲线和电压-透过率（V-T ) 曲线， 并未表示出。 但本领域技术人员应能理 解， 第一伽马参考电压是根据灰阶和透过率曲线和电压-透过率（V-T )曲线 获取的， 本发明对 TN结构的模式不做限制。
202、 根据第一伽马参考电压获取液晶电容的介电常数。
具体的， 步骤 201将所有灰阶分成不同的灰阶区域， 则获取一个灰阶区 域内的液晶电容的介电常数的方法为：
在此灰阶区域内选取一个灰阶， 获取此灰阶对应的第一伽马参考电压， 并获取此第一伽马参考电压下的液晶电容的介电常数，将此液晶电容的介电 常数作为此灰阶区域的液晶电容的介电常数。
优选的， 根据其中一个灰阶区域内的不同灰阶对应的第一伽马参考电 压， 获取不同灰阶对应的液晶电容的介电常数， 并求取此灰阶区域内不同的 所述介电常数的平均值。
如上例所述， 将 256个灰阶分成 3个灰阶区域分别为 Ql , Q2, Q3。 根 据灰阶区域 Q1内的不同的灰阶 L0-L63所对应的不同的第一伽马参考电压， 获取灰阶区域 Q1 内的不同第一伽马参考电压下的多个不同的液晶电容的介 电常数， 并求取 Q1 内的液晶电容的介电常数的平均值。 根据灰阶区域 Q2 内的不同灰阶 L64-L127所对应的第一伽马参考电压，获取灰阶区域 Q2内的 不同第一伽马参考电压下的多个不同的液晶电容的介电常数， 并求取 Q2内 的液晶电容的介电常数的平均值。根据灰阶区域 Q3内的不同灰阶 L128-L255 所对应的第一伽马参考电压， 获取灰阶区域 Q3内的不同第一伽马参考电压 下的多个不同的液晶电容的介电常数， 并求取 Q3内的液晶电容的介电常数 的平均值。
需要说明的是，上示例中，将 256个灰阶分成 3个灰阶区域，也可将 256 个灰阶分成 4个灰阶区域， 或是 5个灰阶区域， 本发明对此不做限制。
203、 根据所述液晶电容的介电常数获取所述液晶电容的值。
其中， 求取一个灰阶区域对应的液晶电容的值的方法为： 根据所述灰阶 区域对应的所述介电常数的平均值获取所述灰阶区域对应的液晶电容的值。
具体的，根据公式 CiC = ^获取液晶电容的值； 其中， CiC是液晶电容， a
是液晶电容的介电常数， S是液晶电容的正对面积， d是液晶电容的两电 极的距离。
需要说明的是， 是步骤 202求取的介电常数。 若在步骤 202中求取的 介电常数是灰阶区域内一个灰阶对应的介电常数， 则 是此灰阶对应的介电 常数；若在步骤 202中求取的介电常数是灰阶区域内不同介电常数的平均值， 则 是此灰阶区域内不同介电常数的平均值。
204、根据所述液晶电容的值获取回馈电压 Δ^ , 根据所述回馈电压获取 第二伽马参考电压， 并将所述第一伽马参考电压更新为所述第二伽马参考电 压。
需要说明的是， 将所述第一伽马参考电压更新为所述第二伽马参考电压 有两种方法， 第一种方法是求取一个灰阶区域对应的回馈电压后， 直接求取 此灰阶区域对应的第二伽马参考电压， 并将此灰阶区域所有的第一伽马参考 电压更新为第二伽马参考电压。第二种方法是求取各个灰阶区域对应的回馈 电压后， 根据各个回馈电压确定此各个回馈电压所属的灰阶区域， 并求取各 个灰阶区域对应的第二伽马参考电压，将各个回馈电压所属的灰阶区域的所 有第一伽马参考电压相应的更新为第二伽马参考电压。
对于第一种方法， 具体的， 根据步骤 203获取的一个灰阶区域对应的液 晶电容的值获取回馈电压， 并根据所述回馈电压获取所述灰阶区域对应的第 二伽马参考电压，将所述灰阶区域内所有第一伽马参考电压更新为第二伽马 参考电压， 求取下一个灰阶区域对应的回馈电压， 并根据回馈电压求取第二 伽马参考电压，将灰阶区域所有的第一伽马参考电压更新为第二伽马参考电 压， 直至将最后一个灰阶区域所有的第一伽马参考电压更新为第二伽马参考 电压。
C * AV
其中， 根据公式 Δ^ = ： gM 获取回馈电压; 其中， 是回馈电 压， Cgx是栅极源极电容， Δ^,是栅极高电压与栅极低电压之差， Crf是存储 电容， CiC是液晶电容。
根据公式^ ^ = _ + Δ 获取第二伽马参考电压； 其中， Gp是第二伽 马参考电压的正电压， Gn是第二伽马参考电压的负电压， Ve。m是公共电极电 压， 是回馈电压。
例如， 如上例所述， 在步骤 203获取灰阶区域 Q1对应的液晶电容的值
C * AV
后， 由公式 Δ^ = ： 8h' 获取灰阶区域 Q1对应的回馈电压, 并根据公 式^^ ι = ρ^ + Δ 获取灰阶区域 Qi对应的第二伽马参考电压， 将灰阶区 域 Q1 内的所有第一伽马参考电压更新为第二伽马参考电压， 即将灰阶区域 Q1 内的 64个第一伽马参考电压更新为第二伽马参考电压。 将灰阶区域 Q1 内的所有第一伽马参考电压更新为第二伽马参考电压后， 再求取灰阶区域 Q2对应的回馈电压， 并根据灰阶区域 Q2对应的回馈电压求取灰阶区域 Q2 对应的第二伽马参考电压， 并将灰阶区域 Q2所有的第一伽马参考电压更新 为第二伽马参考电压。 将灰阶区域 Q2内的所有第一伽马参考电压更新为第 二伽马参考电压后， 再求取灰阶区域 Q3对应的回馈电压， 并根据灰阶区域 Q3对应的回馈电压求取灰阶区域 Q3对应的第二伽马参考电压，并将灰阶区 域 Q3所有的第一伽马参考电压更新为第二伽马参考电压。
需要说明的是， 上示例中的顺序可以根据需要改变， 本发明对此不做限 制。
对于第二种方法， 在根据所述回馈电压获取第二伽马参考电压之前， 还 包括： 根据各个回馈电压确定所述各个回馈电压所属的灰阶区域。
具体的，根据不同灰阶区域对应的液晶电容的值获取不同灰阶区域对应 的回馈电压， 根据各个回馈电压确定所述各个回馈电压所属的灰阶区域， 并 根据所述各个回馈电压获取所述各个回馈电压所属的灰阶区域对应的第二 伽马参考电压，将所述各个回馈电压所属的灰阶区域内所有的第一伽马参考 电压更新为所述第二伽马参考电压。
例如， 如上例所述， 获取灰阶区域 Q1对应的液晶电容的值后， 由公式 c,+cr +c„获取灰阶区域 Ql 对应的回馈电压 AVpl; 获取灰阶区域
C *AV
Q2对应的液晶电容的值后， 由公式 = r r 获取灰阶区域 Q2对 应的回馈电压 Δνρ2; 获取灰阶区域 Q3 对应的液晶电容的值后， 由公式
C, *AV ghl
r +r +r 获取灰阶区域 Q3对应的回馈电压 AVp3。获取回馈电压△
Vpl, AVp2, AVp3后， 根据公式^^^^^+八^, 分别求出每个灰阶区域
Ql、 Q2、 Q3所对应的第二伽马参考电压， 最后将每个灰阶区域 Ql、 Q2、 Q3内所有的第一伽马参考电压分别更新为第二伽马参考电压。
具体来讲， 对于灰阶区域 Q1, 其所对应的回馈电压为 AVpl, 并根据公 式^ = 获取灰阶区域 Q1对应的第二伽马参考电压， 将灰阶区 域 Q1 内的所有第一伽马参考电压更新为第二伽马参考电压。 对于灰阶区域 Q2, 其所对应的回馈电压为 AVp2, 并根据公式^^^^^+八^获取灰阶 区域 Q2对应的第二伽马参考电压， 将灰阶区域 Q2内的所有第一伽马参考 电压更新为第二伽马参考电压。 对于灰阶区域 Q3, 其所对应的回馈电压为 △ Vp3, 并根据公式 = m+A 获取灰阶区域 Q3对应的第二伽马参考 电压，将灰阶区域 Q3内的所有第一伽马参考电压更新为第二伽马参考电压。
需要说明的是， 回馈电压 的大小直接影响显示装置的驱动电压， 二
C *AV,,
者是正比关系。 的计算公式为： Δ^ = ,根据公式可知 随 液晶电容 CiC的变化而变化。 在 TN模式中， 驱动电压大时， 液晶电容 CiC增 大， 驱动电压小时， 液晶电容 CiC减小。
由于存在上述关系， 可以通过调节反馈电压 Δ^, 从而调整伽马参考电 压， 实现减小驱动电压， 降低功耗的目的。
对于常白模式的 ΤΝ结构， L0时的驱动电压最大， 即灰阶区域 Q1的驱 动电压最大， 所以对应的液晶电容最大， 所以灰阶区域 Q1对应的 Δνρ 最 小； 相反的， 灰阶区域 Q3区域对应的 AVp3最大。
由于不同的回馈电压△ Vp 对应不同的伽马参考电压， 根据公式 P 2 " m + A 可知, 在公共电压不变的情况下， 当回馈电压 A Vp 小， 伽马参考电压也小。 所以将灰阶区域 Q1 内第一伽马参考电压更新为第二伽 马电压后， 灰阶区域 Q1 内的伽马参考电压最小， 相应的， 灰阶区域 Q3 内 的伽马参考电压最大。
同理， 对于常黑模式的 TN结构， L0 时的驱动电压最小， 即灰阶区域 Q1的驱动电压最小， 所以对应的液晶电容最小， 所以灰阶区域 Q1对应的 Δ νρ 最大； 相反的， 灰阶区域 Q3区域对应的 A Vp3最小。
由于不同的回馈电压△ Vp 对应不同的伽马参考电压， 根据公式
Gp + 2 G" = Vcom + AVp -^^ , 在公共电压不变的情况下， 当回馈电压 A Vp大时， 则伽马参考电压大， 当回馈电压 A Vp 小时， 则伽马参考电压也小。 所以将 灰阶区域 Q1 内的第一伽马参考电压更新为第二伽马参考电压后， 灰阶区域 Q1内的伽马参考电压最大， 相应的， 灰阶区域 Q3内的伽马参考电压最小。
现有技术中不同灰阶区域的伽马参考电压为了保证电压在发生电容耦 合作用而降低后， 都能够达到自己设定的预期值， 所以将不同灰阶区域的伽 马参考电压都加上了一个最大的回馈电压 A Vp值。 而本发明的实施例中所 提到的第二伽马参考电压是根据不同灰阶的实际情况而计算得到的，故回馈 电压 A Vp相比之前的原始的伽马参考电压 （第一伽马参考电压）所对应的 回馈电压 A Vp会有所降低， 故能降低功耗。 这样， 通过将不同灰阶区域设 定不同的回馈电压 Δ Vp ,使得至少一个灰阶对应的第二伽马参考电压的值相 比于第一伽马参考电压的值要低一些， 故能降低功耗。 时， 降低的值的不同， 加入的回馈电压也不同， 使得至少一个灰阶对应的伽 压减小， 降氏了功耗。 回馈电压 Δ V 的影响， 从而再根据不同灰阶区域下的回馈电压 Δ V 值算出 新的伽马参考电压值。
即，开始时是在不同灰阶区域的伽马参考电压值，测得液晶的介电常数， 然后由这个不同的液晶的介电常数 ,得到不同的液晶电容 Clc, 然后不同的 液晶电容 Clc 又决定了不同的回馈电压 A Vp , 再由这个不同的回馈电压 Δ Vp决定新的伽马参考电压值。 最终结果是调整了伽马参考电压。 因为新的伽马参考电压值（第二伽马参考电压）是通过未调节之前的原 始的伽马参考电压值（第一伽马参考电压） ， 经过一系列运算得到的， 这个 伽马参考电压值相比于原始的伽马参考电压值要低一些， 故能降低功耗。 如 运算， 得到的伽马参考电压值应该与新的伽马参考电压值一致， 基本不会再 或者， 如果有变化， 我们可以进行多次这样的运算， 逐步微调， 以达到更精 确的伽马参考电压值。
本发明实施例提供了一种伽马参考电压的设定方法， 首先将所有的灰阶 划分为不同的灰阶区域， 对于每个灰阶区域， 都需要根据灰阶区域内的不同 灰阶对应的第一伽马参考电压获取液晶电容的介电常数， 并求取介电常数的 平均值，根据灰阶区域对应的介电常数的平均值获取灰阶区域对应的液晶电 容的值， 并根据灰阶区域对应的液晶电容的值获取灰阶区域对应的回馈电 压，根据灰阶区域对应的回馈电压获取灰阶区域对应的第二伽马参考电压的 值， 并将灰阶区域内所有的第一伽马参考电压更新为第二伽马参考电压， 使 得不同灰阶区域加入伽马参考电压的回馈电压不同。根据不同灰阶区域的伽 马参考电压在发生电容耦合而降低时， 降低的值的不同， 加入的回馈电压也 不同， 使得至少一个灰阶对应的伽马参考电压降低， 通过重新设定显示装置 的伽马参考电压， 从而使得整体驱动电压减小， 降低了功耗。
本发明实施例提供了一种伽马参考电压的设定装置，如图 3所示，包括： 获取介电常数单元 301 , 用于根据第一伽马参考电压获取液晶电容的介 电常数。
获取液晶电容单元 302 , 用于根据所述液晶电容的介电常数获取液晶电 容的值。
具体的， 所述获取液晶电容单元 302根据公式 CiC = ^获取液晶电容 a
的值； 其中， ciC是液晶电容， £是液晶电容的介电常数， S是液晶电容的正 对面积， d是液晶电容的两电极的距离。
设定伽马参考电压单元 303 ,用于根据所述液晶电容的值获取回馈电压， 根据所述回馈电压获取第二伽马参考电压， 并将所述第一伽马参考电压更新 为所述第二伽马参考电压。 其中，所述设定伽马参考电压单元 303根据公式 =
^-gs + ^LC + gM 求取
^st 回馈电压； 其中， 是回馈电压， Cgx是栅极源极电容， Δ ¾,是栅极高电压 与栅极低电压之差， 是存储电容， CiC是液晶电容。
所述设定伽马参考电压单元 303根据公式 = Vcom 获取第二伽 马参考电压； 其中， Gp是第二伽马参考电压的正电压， Gn是第二伽马参考 电压的负电压， Ve。m是公共电极电压， 是回馈电压。
根据本发明的另一实施例，所述伽马参考电压的设定装置，如图 4所示， 还包括：
确定单元 304 , 用于确定不同灰阶所对应的第一伽马参考电压。
划分单元 305 , 用于将所有灰阶划分为不同的灰阶区域。
所述获取介电常数单元 301具体用于： 根据其中一个灰阶区域内的不同 灰阶对应的第一伽马参考电压， 获取不同灰阶对应的液晶电容的介电常数， 并求取此灰阶区域内不同的所述介电常数的平均值。
所述获取液晶电容单元 302具体用于，根据所述灰阶区域对应的所述介 电常数的平均值获取所述灰阶区域对应的液晶电容的值。
所述设定伽马参考电压单元 303 , 如图 5所示， 包括： 第一获取回馈电 压模块 3031 , 第一获取第二伽马参考电压模块 3032 , 第一更新模块 3033。
所述第一获取回馈电压模块 3031 ,用于根据一个所述灰阶区域对应的液 晶电容的值获取回馈电压。
所述第一获取第二伽马参考电压模块 3032 ,用于根据所述第一获取回馈 电压模块 3031获取的所述回馈电压获取所述灰阶区域对应的第二伽马参考 电压。
所述第一更新模块 3033 ,用于根据所述第一获取第二伽马参考电压模块 3032获取的第二伽马参考电压，将所述灰阶区域内所有第一伽马参考电压更 新为第二伽马参考电压。
或者， 所述设定伽马参考电压单元， 如图 6所示， 包括： 第二获取回馈 电压模块 3034 ,第二获取第二伽马参考电压模块 3035 ,第二更新模块 3036 , 确定模块 3037。
所述第二获取回馈电压模块 3034 ,用于根据所述不同的灰阶区域所对应 的液晶电容的值获取各个灰阶区域的回馈电压。 所述确定模块 3037 , 用于根据所述第二获取回馈电压模块 3034获取的 各个所述回馈电压确定各个所述回馈电压所属的灰阶区域。
所述第二获取第二伽马参考电压模块 3035 ,用于根据所述第二获取回馈 电压模块 3034获取的各个所述回馈电压获取各个所述回馈电压所属的灰阶 区域对应的第二伽马参考电压。
所述第二更新模块 3036 ,用于根据所述第二获取第二伽马参考电压模块 3035获取的第二伽马参考电压，将各个所述回馈电压所属的灰阶区域内所有 的第一伽马参考电压更新为所述第二伽马参考电压。
本发明实施例还提供了一种驱动电路，包括：伽马参考电压的设定装置， 驱动电压设定装置， 驱动电压输出装置， 所述伽马参考电压的设定装置为上 述实施例中所述的伽马参考电压的设定装置。该驱动电路包括但不限于显示 装置的源极驱动电路。
其中， 源极驱动电路是利用与从控制器接收到的数据信号相对应的电压 来驱动显示面板数据线的电路。 源极驱动电路中包括伽马参考电压的设定装 置， 用来设定不同灰阶对应的伽马参考电压， 并将设定的伽马参考电压发送 至驱动电压设定装置，使得驱动电压设定装置将接收到的伽马参考电压设定 为驱动电压， 并将驱动电压发送至驱动电压输出装置， 使得驱动电压输出装 置输出驱动电压以驱动数据线， 产生液晶电容， 使液晶发生偏转。
具体的，伽马参考电压的设定装置通过根据第一伽马参考电压获取液晶 电容的介电常数， 获取液晶电容的值， 并根据液晶电容的值获取回馈电压， 根据回馈电压获取第二伽马参考电压的值， 并将第一伽马参考电压更新为第 二伽马参考电压， 使得不同灰阶加入伽马参考电压的回馈电压不同， 使得伽 马参考电压的设定装置输出的不同灰阶对应的伽马参考电压中， 至少一个灰 阶对应的伽马参考电压低。伽马参考电压的设定装置将伽马参考电压发送至 驱动电压设定装置， 驱动电压设定装置接收到伽马参考电压后， 将伽马参考 电压设定为驱动电压， 并将驱动电压发送至驱动电压输出装置， 使得驱动电 压输出装置输出驱动电压以驱动数据线， 产生液晶电容， 使液晶发生偏转。
由于伽马参考电压的设定装置对于不同的灰阶加入伽马参考电压的回 馈电压不同， 所以伽马参考电压的设定装置设定的伽马参考电压不同， 且至 马参考电压， 所以驱动电压设定装置设定的驱动电压低于现有技术中驱动电 压设定装置设定的驱动电压， 所以在满足不同亮度的驱动电压的同时， 使得 显示装置的伽马参考电压降低， 从而实现降低显示装置的驱动电压， 降低功 耗。
本发明实施例还提供了一种显示装置， 包括伽马参考电压的设定装置， 所述伽马参考电压的设定装置包括上述实施例中所述的伽马参考电压的设 定装置。
本发明实施例提供了一种伽马参考电压的设定方法、 设定装置、 驱动电 路及显示装置， 通过根据第一伽马参考电压获取液晶电容的介电常数， 获取 液晶电容的值， 并根据液晶电容的值获取回馈电压， 根据回馈电压获取第二 伽马参考电压的值， 并将第一伽马参考电压更新为第二伽马参考电压， 使得 不同灰阶加入伽马参考电压的回馈电压不同，使得至少一个灰阶对应的伽马 参考电压降低， 在满足不同亮度的驱动电压的同时， 由于至少一个灰阶对应 的伽马参考电压降低， 通过重新设定显示装置的伽马参考电压， 使得显示装 置的伽马参考电压降低， 从而实现降低显示装置的驱动电压， 降低功耗。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护 范围应以所述权利要求的保护范围为准。

Claims

权利要求书
1、 一种伽马参考电压的设定方法， 包括：
根据第一伽马参考电压获取液晶电容的介电常数；
根据所述液晶电容的介电常数获取所述液晶电容的值；
根据所述液晶电容的值获取回馈电压， 根据所述回馈电压获取第二伽马 参考电压， 并将所述第一伽马参考电压更新为所述第二伽马参考电压。
2、 根据权利要求 1 所述的方法， 其中， 在获取第一伽马参考电压下液 晶电容的介电常数之前， 还包括：
确定不同灰阶各自对应的第一伽马参考电压；
将所有灰阶划分为不同的灰阶区域。
3、 根据权利要求 2所述的方法， 其中，
所述根据第一伽马参考电压获取液晶电容的介电常数包括： 根据其中一 个灰阶区域内的不同灰阶各自对应的第一伽马参考电压，获取不同灰阶各自 对应的液晶电容的介电常数， 并求取此灰阶区域内不同的所述介电常数的平 均值；
所述根据所述液晶电容的介电常数获取所述液晶电容的值包括： 根据所 述灰阶区域对应的所述介电常数的平均值获取所述灰阶区域对应的液晶电 容的值。
4、 根据权利要求 2所述的方法， 其中， 所述根据液晶电容的值获取回 馈电压， 根据所述回馈电压获取第二伽马参考电压， 并将所述第一伽马参考 电压更新为所述第二伽马参考电压包括：
对于每一个所述灰阶区域， 执行以下处理： 根据该灰阶区域对应的液晶 电容的值获取回馈电压， 并根据所述回馈电压获取所述灰阶区域对应的第二 伽马参考电压，将所述灰阶区域内所有第一伽马参考电压更新为第二伽马参 考电压。
5、 根据权利要求 2所述的方法， 其中，
所述根据所述液晶电容的值获取回馈电压，根据所述回馈电压获取第二 伽马参考电压， 并将所述第一伽马参考电压更新为所述第二伽马参考电压包 括： 根据不同灰阶区域的液晶电容获取所述不同灰阶区域对应的回馈电压， 根据各个回馈电压确定所述各个回馈电压所属的灰阶区域， 并根据所述各个 回馈电压获取所述各个回馈电压所属的灰阶区域对应的第二伽马参考电压， 将所述各个回馈电压所属的灰阶区域内所有的第一伽马参考电压更新为所 述第二伽马参考电压。
6、 根据权利要求 1 所述的方法， 其中， 所述根据所述介电常数获取所 述液晶电容具体为：
根据公式 CiC = ^获取液晶电容的值； 其中， CiC是液晶电容， £是液 a
晶电容的介电常数， S是液晶电容的正对面积， d是液晶电容的两电极的距 离。
7、 根据权利要求 1 所述的方法， 其中， 所述根据所述液晶电容获取回 馈电压具体为：
C * AV
根据公式 Δ^ = " 获取回馈电压; 其中， 是回馈电压， Cgs 是栅极源极电容， 是栅极高电压与栅极低电压之差， crf是存储电容， CLC 是液晶电容。
8、 根据权利要求 1-7 任一项所述的方法， 其中， 所述根据所述回馈电 压获取第二伽马参考电压具体为：
根据公式^ ^ = _ + Δ 获取第二伽马参考电压； 其中， Gp是第二伽 马参考电压的正电压， Gn是第二伽马参考电压的负电压， Ve。m是公共电极电 压， 是回馈电压。
9、 一种伽马参考电压的设定装置， 包括：
获取介电常数单元， 用于根据第一伽马参考电压获取液晶电容的介电常 数；
获取液晶电容单元， 用于根据所述液晶电容的介电常数获取液晶电容的 值；
设定伽马参考电压单元， 用于根据所述液晶电容的值获取回馈电压， 根 据所述回馈电压获取第二伽马参考电压， 并将所述第一伽马参考电压更新为 所述第二伽马参考电压。
10、 根据权利要求 9所述的装置， 还包括： 确定单元和划分单元； 所述确定单元， 用于确定不同灰阶所对应的第一伽马参考电压； 所述划分单元， 用于将所有灰阶划分为不同的灰阶区域。
11、 根据权利要求 10所述的装置， 其中， 所述获取介电常数单元具体用于： 根据其中一个灰阶区域内的不同灰阶 各自对应的第一伽马参考电压，获取不同灰阶各自对应的液晶电容的介电常 数， 并求取此灰阶区域内不同的所述介电常数的平均值；
所述获取液晶电容单元具体用于，根据所述灰阶区域对应的所述介电常 数的平均值获取所述灰阶区域对应的液晶电容的值。
12、 根据权利要求 10所述的装置， 其中， 所述设定伽马参考电压单元 包括： 第一获取回馈电压模块， 第一获取第二伽马参考电压模块， 第一更新 模块；
所述第一获取回馈电压模块， 用于根据一个所述灰阶区域对应的液晶电 容的值获取回馈电压；
所述第一获取第二伽马参考电压模块， 用于根据所述第一获取回馈电压 模块获取的所述回馈电压获取所述灰阶区域对应的第二伽马参考电压； 所述第一更新模块， 用于根据所述第一获取第二伽马参考电压模块获取 的第二伽马参考电压，将所述灰阶区域内所有第一伽马参考电压更新为第二 伽马参考电压。
13、 根据权利要求 10所述装置， 其中， 所述设定伽马参考电压单元包 括： 第二获取回馈电压模块， 第二获取第二伽马参考电压模块， 第二更新模 块， 确定模块；
所述第二获取回馈电压模块， 用于根据所述不同的灰阶区域所对应的液 晶电容的值获取各个灰阶区域的回馈电压；
所述确定模块， 用于根据所述第二获取回馈电压模块获取的各个所述回 馈电压确定各个所述回馈电压所属的灰阶区域；
所述第二获取第二伽马参考电压模块， 用于根据所述第二获取回馈电压 模块获取的各个所述回馈电压获取各个所述回馈电压所属的灰阶区域对应 的第二伽马参考电压；
所述第二更新模块， 用于根据所述第二获取第二伽马参考电压模块获取 的第二伽马参考电压，将各个所述回馈电压所属的灰阶区域内所有的第一伽 马参考电压更新为所述第二伽马参考电压。
14、 一种驱动电路， 包括： 驱动电压设定装置， 驱动电压输出装置， 伽 马参考电压的设定装置；
所述伽马参考电压的设定装置为上述权利要求 9-13 任一项所述的伽马 参考电压的设定装置。
15、 一种显示装置， 包括上述权利要求 9-13 任一项所述的伽马参考电 压的设定装置。
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