WO2020118855A1 - 伽马分压电路、电压调节方法及液晶显示装置 - Google Patents

伽马分压电路、电压调节方法及液晶显示装置 Download PDF

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Publication number
WO2020118855A1
WO2020118855A1 PCT/CN2019/072220 CN2019072220W WO2020118855A1 WO 2020118855 A1 WO2020118855 A1 WO 2020118855A1 CN 2019072220 W CN2019072220 W CN 2019072220W WO 2020118855 A1 WO2020118855 A1 WO 2020118855A1
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Prior art keywords
gray
scale
voltage
binding
binding point
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French (fr)
Inventor
颜伟男
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US16/341,063 priority Critical patent/US10978014B2/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • 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

Definitions

  • the present invention relates to the field of display technology, in particular to a gamma voltage divider circuit, a voltage adjustment method, and a liquid crystal display device.
  • OLED Organic Light Emitting Diode
  • OLED display devices have the advantages of high contrast, wide viewing angle, low power consumption, thinner volume, etc., and are recognized by the industry as the most promising display devices.
  • AMOLED Active-matrix organic light emitting diode originated from OLED display technology. AMOLED has the characteristics of self-luminous, so AMOLED panel has a wide viewing angle and high color saturation, especially its low driving voltage and low power consumption, plus fast response, light weight, thin thickness, simple structure, low cost, etc. One of the most promising products.
  • a schematic diagram of an existing OLED driving circuit includes: a first thin film transistor T1, a second thin film transistor T2, and a capacitor Cst, where the first thin film transistor T1 is a switching TFT and the second thin film transistor T2 To drive the TFT, the capacitor Cst is a storage capacitor.
  • the source of the first thin film transistor T1 is electrically connected to the first node G, its gate is connected to the scan signal Scan, and its drain is connected to the data voltage Vdata;
  • the source of the second thin film transistor T2 is electrically connected
  • the anode of the organic light emitting diode D0, its drain is connected to the power supply voltage OVDD, and its gate is electrically connected to the first node G;
  • the cathode of the organic light emitting diode D0 is connected to the common ground voltage OVSS; one end of the capacitor Cst is electrically connected to the first
  • the gate of the two thin film transistors T2 is connected to the power supply voltage OVDD at the other end.
  • the scan signal Scan controls T1 to turn on, and the data voltage Vdata enters the gate and capacitor Cst of T2 through T1; then T1 is turned off, and the gate voltage of T2 can continue to hold data due to the storage effect of the capacitor Cst
  • the voltage causes T2 to be in a conducting state, and the driving current enters the organic light emitting diode D0 through T2 to drive the organic light emitting diode D0 to emit light.
  • the size of the data voltage Vdata can control the brightness of the organic light emitting diode D0. Therefore, the driver chip needs to give an accurate data voltage Vdata to ensure the normal display of the OLED panel.
  • the data voltage Vdata is determined by the gamma (GAMMA) in the driver chip. )
  • the voltage divider circuit is generated.
  • FIG. 2 a schematic diagram of an existing gamma voltage divider circuit.
  • the gamma voltage divider circuit requires a large number of resistor strings to divide voltage in order to output an appropriate voltage.
  • the existing gamma voltage divider is composed of multiple voltage divider resistors connected in series. The more resistance, the higher the voltage divider accuracy.
  • the resistor string is composed of 2048 voltage divider resistors R0. For OLED panels, each grayscale value corresponds to a luminance value.
  • Band point (Band Point, BP for short) refers to a fixed number of gray levels, and each gray level value has a corresponding gray level voltage.
  • the grayscale voltage of the binding point corresponding to the binding point is adjusted, and the grayscale voltage of the middle region can be obtained by interpolating the grayscale voltage of the binding point VBPi.
  • the existing gamma voltage divider circuit adjusts each binding point BPi in turn to find a suitable binding point gray-scale voltage VBPi on the voltage dividing resistor, and finally makes the luminance-binding point curve satisfy the formulation of the gamma index relationship, as shown in Figure 3
  • the ideal curve of binding point and brightness value As shown in FIG. 3, the resolution of the OLED panel is 8 bits, so it includes 256 binding point values BP0-BP255 and 256 corresponding luminance values L0-L255.
  • the corresponding minimum gray-scale binding point voltage VGSS and maximum gray-scale binding point voltage VGDD are generally set It is defined as two independent voltages (that is, the voltage across the voltage dividing resistor string). Since the number of voltage-dividing resistor strings is fixed, when the difference between the gray-scale binding point voltages VGDD/VGSS at both ends of the resistor string becomes larger, the voltage divided by each resistor also becomes larger. It makes it impossible to distinguish the brightness of each gray level in the low gray level section, as shown in the graph of the existing binding point and brightness value shown in FIG. 4.
  • Gamma adjustment is implemented by a gamma voltage divider circuit in the driver chip, which requires a large number of resistor strings to divide voltage in order to output an appropriate voltage.
  • resistor string due to the low precision of the resistor divider, it cannot be distinguished at low gray levels; or a considerable number of resistors are set in the resistor string, such as 2048, the resistor string consumes a lot of resistors, which will increase the complexity and complexity of the gamma divider circuit cost.
  • the object of the present invention is to provide a gamma voltage divider circuit, a voltage adjustment method, and a liquid crystal display device.
  • a threshold gray-scale voltage in the middle of the voltage-dividing resistor string, the accuracy of the low gray-scale voltage is optimized, the display effect is improved, and the resistance due to resistance is solved.
  • the low voltage division accuracy leads to the problem that it cannot be distinguished at low gray levels, or the resistor string consumes a large amount of resistance, which increases the complexity and cost of the gamma voltage division circuit.
  • the present invention provides a gamma voltage divider circuit
  • the gamma voltage divider circuit includes: at least two gray-scale resistor strings connected in series, and each of the gray-scale resistor strings includes a plurality of voltage divider resistors
  • each of the binding point gray-scale voltages corresponds to a binding point
  • at least one threshold gray-scale voltage is input to the common terminal of an adjacent two gray-scale resistor strings; wherein, The threshold gray-scale voltage is greater than the gray-scale voltages of all the binding points of one gray-scale resistor string of the two adjacent gray-scale resistor strings, and is smaller than the other gray of the adjacent two gray-scale resistor strings.
  • the gray-scale voltage of all binding points of the first-order resistor string is greater than the gray-scale voltages of all binding points of the first-order resistor string.
  • the present invention also provides a liquid crystal display device, the liquid crystal display device includes a gamma voltage divider circuit, the gamma voltage divider circuit includes: at least two gray-scale resistor strings connected in series, each The gray-scale resistor string includes a plurality of voltage-dividing resistors to provide a plurality of tie-point gray-scale voltages, each of the tie-point gray-scale voltages corresponds to a tie-point; at least one threshold gray-scale voltage, input an adjacent two Common end of a gray-scale resistor string; wherein the threshold gray-scale voltage is greater than the gray-scale voltage of all the binding points of one gray-scale resistor string of the two adjacent gray-scale resistor strings, and less than the adjacent The grayscale voltage of all the binding points of the other grayscale resistor string of the two grayscale resistor strings.
  • the present invention also provides a voltage adjustment method for adjusting a plurality of tie-point gray-scale voltages provided by a gamma voltage divider circuit in a liquid crystal display device.
  • the voltage adjustment method includes the following steps: (1) Determine the threshold gray-scale voltage corresponding to at least one threshold gray-scale binding point; (2) Divide the gamma voltage divider circuit into multiple gray-scale resistor strings connected in series according to all the threshold gray-scale binding points, each A gray-scale resistor string includes a plurality of voltage-dividing resistors to provide a plurality of binding point gray-scale voltages, and each of the binding point gray-scale voltages corresponds to a binding point; (3)
  • the threshold gray-scale voltage is provided to The common end of the two adjacent gray-scale resistor strings, wherein the threshold gray-scale voltage is greater than the gray-scale voltage of all the binding points of one of the two gray-scale resistor strings, and is less than The gray-scale voltage of all the binding points of the other two gray-scale resistor strings of the adjacent
  • the present invention can further optimize the accuracy of low gray-scale voltage, improve the display effect, and reduce the number of voltage dividing resistors and reduce the gamma score compared with the setting of the voltage dividing resistor string of the existing gamma voltage dividing circuit. Pressure circuit complexity and cost.
  • the gamma voltage-dividing circuit of the present invention is applicable to the voltage-dividing resistor string setting of the OLED panel, and is also applicable to the voltage-dividing resistor string setting of the LCD panel.
  • FIG. 1 the schematic diagram of the existing OLED drive circuit
  • FIG. 2 the schematic diagram of the existing gamma voltage divider circuit
  • FIG. 5 is a schematic diagram of the first embodiment of the gamma voltage divider circuit of the present invention.
  • FIG. 6 is a graph of the binding point and the brightness value of the present invention.
  • FIG. 7 is a schematic diagram of a second embodiment of the gamma voltage divider circuit of the present invention.
  • FIG. 8 is a block diagram of an embodiment of the voltage regulation method of the present invention.
  • FIG. 9 is a flowchart of an embodiment of the voltage adjustment method of the present invention.
  • the first feature "above” or “below” the second feature may include the direct contact of the first and second features, or may include the first and second features Contact not directly but through another feature between them.
  • the first feature is “above”, “above” and “above” the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
  • the first feature is “below”, “below” and “below” the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is less horizontal than the second feature.
  • the gamma voltage dividing circuit of the present invention includes: at least two gray-scale resistor strings connected in series, each of the gray-scale resistor strings includes a plurality of voltage-dividing resistors to provide a plurality of gray-point voltages at each binding point, and each of the binding points
  • the gray-scale voltage corresponds to a binding point; at least one threshold gray-scale voltage is input to the common end of an adjacent two gray-scale resistor strings; wherein the threshold gray-scale voltage is greater than the two adjacent gray-scales
  • the gray-scale voltages of all the binding points of one gray-scale resistance string of the resistance string are less than the gray-scale voltages of all the binding points of the other gray-scale resistance string of the two adjacent gray-scale resistance strings.
  • the threshold gray-scale binding point (BPth) corresponding to the threshold gray-scale voltage (VGth) of the gamma voltage-dividing circuit of the present invention can be used to distinguish between medium and high gray scales with large voltage spans and low gray scales that are difficult to distinguish voltages.
  • the middle and high grayscale and low grayscale two-level grayscale resistance strings can be designed, and a set of threshold grayscale voltages can be input; the high, medium and low three-level grayscale resistance strings can also be designed according to the display effect of the display device , That is, input two sets of threshold gray-scale voltage, or more.
  • the gamma voltage divider circuit of the present invention can further optimize the accuracy of low gray-scale voltage, improve the display effect, and reduce the number of voltage divider resistors by changing the voltage mapping mode of the tie point, compared with the setting of the voltage divider resistor string of the existing gamma voltage divider circuit , Reduce the complexity and cost of the gamma divider circuit.
  • the gamma voltage-dividing circuit of the present invention is applicable to the voltage-dividing resistor string setting of the OLED panel, and is also applicable to the voltage-dividing resistor string setting of the LCD panel.
  • the gamma voltage divider circuit includes: a first gray-scale resistor string 51, a second gray-scale resistor string 52, and a first threshold gray-scale voltage VGth1.
  • the first gray scale resistor string 51 includes M first voltage dividing resistors R1, the first gray scale resistor string 51 provides M first binding point gray scale voltages VBPm, each of the first binding point gray scales The voltage VBPm corresponds to a first binding point BPm.
  • the second gray scale resistor string 52 is connected in series with the first gray scale resistor string 51, the second gray scale resistor string 52 includes N second voltage dividing resistors R2, and the second gray scale resistor string 52 provides N second binding point gray scale voltages VBPn, each of the second binding point gray scale voltages VBPn corresponds to a second binding point BPn.
  • the first threshold gray-scale voltage VGth1 is input to the common terminal of the second gray-scale resistance string 52 and the first gray-scale resistance string 51 (ie, the first threshold gray-scale binding point BPth1).
  • the first threshold gray-scale voltage VGth1 is greater than all the second binding point gray-scale voltages VBPn and less than all the first binding point gray-scale voltages VBPm.
  • the top of the first gray-scale resistor string 51 is the highest gray-scale binding point voltage VGDD
  • the bottom of the second gray-scale resistor string 52 is the lowest gray-scale binding point voltage VGSS, VGDD, VGSS are set as independent Two voltages.
  • all the binding points in the gamma voltage divider circuit are divided into M first binding points BPm and N second binding points BPn according to a first threshold gray-scale binding point BPth1; M first voltage dividing resistors R1 corresponding to a binding point BPm are set as the first gray-scale resistor string 51; and N second voltage dividing resistors R2 corresponding to the N second binding points BPn are set It is defined as the second gray-scale resistor string 52; wherein, the gray-scale voltage corresponding to the first threshold gray-scale binding point BPth1 is the first threshold gray-scale voltage VGth1.
  • the first threshold gray scale binding point BPth1 is used to distinguish between middle and high gray scales with a large voltage span and low gray scales that are difficult to distinguish between voltages.
  • the voltage dividing value of each voltage dividing resistor is:
  • VGDD is the highest gray-scale binding point voltage
  • VGth1 is the first threshold gray-scale voltage
  • M is the number of voltage-dividing resistors R1 in the first gray-scale resistor string 51.
  • the voltage dividing value of each voltage dividing resistor is:
  • VGth1 is the first threshold gray-scale voltage
  • VGSS is the lowest gray-scale binding point voltage
  • N is the number of voltage-dividing resistors R2 in the second gray-scale resistor string 52.
  • the gamma voltage-dividing circuit of the present invention Before setting the low gray-scale binding point voltage, the gamma voltage-dividing circuit of the present invention first determines the threshold gray-scale voltage value corresponding to the threshold gray-scale binding point, and inputs the threshold gray-scale voltage value to the adjacent two voltage-dividing resistor strings At the common end, by adjusting each binding point BPm and BPn in sequence, the appropriate gray-scale voltage of the binding point is found on the voltage-dividing resistor, and finally the brightness-binding point curve satisfies the relationship of formulating the gamma index, as shown in FIG. 6 A graph of points and brightness values. As shown in FIG. 6, the resolution of the OLED panel is 8 bits, so it includes 256 binding point values BP0-BP255 and 256 corresponding luminance values L0-L255.
  • the gamma voltage divider circuit includes: a first gray scale resistor string 71, a second gray scale resistor string 72, a third gray scale resistor string 73, and a first threshold gray scale voltage VGth1, a second threshold Gray scale voltage VGth2.
  • the first gray scale resistor string 71 includes M first voltage dividing resistors R1, the first gray scale resistor string 71 provides M first binding point gray scale voltages VBPm, each of the first binding point gray scales The voltage VBPm corresponds to a first binding point BPm.
  • the second gray scale resistor string 72 is connected in series with the first gray scale resistor string 71, the second gray scale resistor string 72 includes N second voltage dividing resistors R2, and the second gray scale resistor string 72 provides N second binding point gray scale voltages VBPn, each of the second binding point gray scale voltages VBPn corresponds to a second binding point BPn.
  • the third gray-scale resistor string 73 is connected in series with the second gray-scale resistor string 72, the third gray-scale resistor string 73 includes K third voltage-dividing resistors R3, and the third gray-scale resistor string 73 provides K third binding point gray scale voltages VBPk, each of the third binding point gray scale voltages VBPk corresponds to a third binding point BPk.
  • the first threshold gray-scale voltage VGth1 is input to the common terminal of the second gray-scale resistor string 72 and the first gray-scale resistor string 71 (ie, the first threshold gray-scale binding point BPth1). Wherein, the first threshold gray-scale voltage VGth1 is greater than all the second binding point gray-scale voltages VBPn and less than all the first binding point gray-scale voltages VBPm.
  • the second threshold gray-scale voltage VGth2 is input to the common terminal of the third gray-scale resistor string 73 and the second gray-scale resistor string 72 (that is, the second threshold gray-scale binding point BPth2). Wherein, the second threshold gray-scale voltage VGth2 is greater than all the third binding point gray-scale voltages VBPk and less than all the second binding point gray-scale voltages VBPn.
  • the top of the first gray-scale resistor string 71 is the highest gray-scale binding point voltage VGDD
  • the bottom of the third gray-scale resistor string 73 is the lowest gray-scale binding point voltage VGSS
  • VGDD, VGSS are set to be independent Two voltages.
  • all the binding points in the gamma voltage divider circuit are divided into M first binding points BPm and N second binding points according to a first threshold gray-scale binding point BPth1 and a second threshold gray-scale binding point BPth2 Point BPn and K third binding points BPk;
  • M first voltage dividing resistors R1 corresponding to the M first binding points BPm are set as the first gray-scale resistor string 71; and the N N second voltage dividing resistors R2 corresponding to the second binding points BPn are set as the second gray-scale resistor string 72;
  • K third voltage dividing resistors corresponding to the K third binding points BPk R3 is set to the third gray-scale resistor string 72;
  • the gray-scale voltage corresponding to the first threshold gray-scale binding point BPth1 is the first threshold gray-scale voltage VGth1
  • the gray scale voltage corresponding to the point BPth2 is the second threshold gray scale voltage VGth2.
  • the first threshold gray scale binding point BPth1 is used to distinguish between middle gray scale and high gray scale with a large voltage span, and the first threshold gray scale voltage needs to be input between the high gray scale binding point and the middle gray scale binding point VGth1;
  • the second threshold gray-scale binding point BPth2 is used to distinguish between the middle gray-scale with a large voltage span and the low gray-scale that is difficult to distinguish the voltage.
  • the middle gray-scale binding point and the low gray-scale binding point need to input the second threshold gray-scale voltage VGth2.
  • the threshold gray-scale voltage values corresponding to the two sets of threshold gray-scale binding points first determine the threshold gray-scale voltage values corresponding to the two sets of threshold gray-scale binding points, and input the two sets of threshold gray-scale voltage values to the common ends of the adjacent two voltage-dividing resistor strings .
  • the low gray stage provide enough voltage divider resistance to make each gray scale voltage fine enough, so that the displayed gray scale can be distinguished.
  • the voltage dividing value of each voltage dividing resistor is:
  • VGDD is the highest gray-scale binding point voltage
  • VGth1 is the first threshold gray-scale voltage
  • M is the number of voltage-dividing resistors R1 in the first gray-scale resistor string 51.
  • the voltage dividing value of each voltage dividing resistor is:
  • VGth1 is the first threshold gray-scale voltage
  • VGth2 is the first threshold gray-scale voltage
  • N is the number of voltage dividing resistors R2 in the second gray-scale resistor string 72.
  • the voltage-dividing value of each voltage-dividing resistor is:
  • VGth2 is the second threshold gray-scale voltage
  • VGSS is the lowest gray-scale binding point voltage
  • K is the number of voltage-dividing resistors R3 in the third gray-scale resistor string 73.
  • the gamma divider circuit of the present invention Before setting the low gray-scale binding point voltage, the gamma divider circuit of the present invention first determines the threshold gray-scale voltage values corresponding to the two sets of threshold gray-scale binding points, and inputs the two sets of threshold gray-scale voltage values to the adjacent two points The common end of the piezoresistor string, by adjusting each binding point BPm, BPn, BPk in turn, find the appropriate gray-scale voltage of the binding point on the voltage-dividing resistor, and finally make the brightness-binding point curve satisfy the relationship of formulating the gamma index.
  • FIG. 6 is a graph showing the binding point and the brightness value of the present invention.
  • the present invention also provides a liquid crystal display device that uses the gamma voltage divider circuit according to any of the above embodiments of the present invention.
  • the gamma voltage dividing circuit generates a data voltage Vdata to ensure normal display of the display panel in the liquid crystal display device.
  • the display panel may be an OLED panel or an LCD panel.
  • the invention also provides a voltage adjustment method for adjusting the gray-scale voltages of a plurality of binding points provided by a gamma voltage divider circuit in a liquid crystal display device.
  • the voltage adjustment method includes the following steps: S81: determine a threshold grayscale voltage corresponding to at least one threshold grayscale binding point; S82: according to all the threshold grayscales Binding point, dividing the gamma voltage divider circuit into a plurality of gray-scale resistor strings connected in series, each of the gray-scale resistor strings including a plurality of voltage-dividing resistors to provide a plurality of gray-point voltages at the binding points, each The binding point gray scale voltage corresponds to a binding point; S83: providing the threshold gray scale voltage to the common end of two adjacent gray scale resistor strings, wherein the threshold gray scale voltage is greater than the adjacent two The gray-scale voltages of all the binding points of one gray-scale resistor string of the gray-scale resistance strings are less than the
  • the voltage adjustment method of the present invention can design two stages of gray scale resistor strings in the middle gray scale and the low gray scale according to the display effect of the display device, and input a set of threshold gray scale voltages. Before setting the low gray-scale binding point voltage, first determine the threshold gray-scale voltage value corresponding to the threshold gray-scale binding point, and input this threshold gray-scale voltage value to the common end of the adjacent two voltage-dividing resistor strings. In the low gray stage, provide enough voltage divider resistance to make each gray scale voltage fine enough, so that the displayed gray scale can be distinguished.
  • Step S81 further includes: determining a first threshold grayscale voltage corresponding to the first threshold grayscale binding point;
  • Step S82 further includes: according to the first threshold grayscale binding point, the gamma divider circuit All the binding points of the are divided into a plurality of first binding points and a plurality of second binding points, the plurality of first voltage dividing resistors corresponding to the plurality of first binding points are set as the first gray-scale resistor string, and the The plurality of second voltage-dividing resistors corresponding to the plurality of second binding points are set as second gray-scale resistor strings;
  • step S83 further includes: providing the first threshold gray-scale voltage to the first gray-scale resistor A common end of the string and the second gray-scale resistance string, wherein the first threshold gray-scale voltage is greater than all the binding point gray-scale voltages of the second gray-scale resistance string, and less than the first-level resistance string The grayscale voltage of all the binding points.
  • the voltage adjustment method of the present invention can design high, medium, and low three-level gray-scale resistance strings according to the display effect of the display device, that is, input two sets of threshold gray-scale voltages, or more.
  • the low gray stage provide enough voltage divider resistance to make each gray scale voltage fine enough, so that the displayed gray scale can be distinguished.
  • Step S81 further includes: determining a first threshold grayscale voltage corresponding to the first threshold grayscale binding point, and determining a second threshold grayscale voltage corresponding to the second threshold grayscale binding point;
  • step S82 further includes: The first threshold gray-scale binding point and the second threshold gray-scale binding point divide all the binding points in the gamma voltage divider circuit into a plurality of first binding points, a plurality of second binding points and a plurality of first binding points Three binding points, setting a plurality of first voltage dividing resistors corresponding to the plurality of first binding points as the first gray-scale resistor string; setting a plurality of second dividing points corresponding to the plurality of second binding points The varistor is set as the second gray-scale resistor string, and the plurality of third voltage-dividing resistors corresponding to the plurality of third binding points are set as the third gray-scale resistor string;
  • step S83 further includes: providing the The first threshold gray scale voltage is provided to the common end of the first gray scale resistor string and the second gray
  • step 3) will determine whether these binding points have been selected one by one. When these binding points have not been selected one by one, change the voltage division position and return to step 2) to select the remaining binding points for adjustment. In contrast, when these binding points have been selected one by one, it means that these binding points have been adjusted one by one, so the adjustment of these binding points will be ended.
  • FIG. 9 a flowchart of an embodiment of the voltage adjustment method of the present invention.
  • first determine the threshold grayscale voltage VGth (VGth VBPth) corresponding to the threshold grayscale Gth; then, according to the binding point number from low to high, select the gamma partial pressure in turn
  • the binding point BPi of the circuit adjust the binding point BPi; then change the voltage division position, determine the binding point gray-scale voltage VBPi; determine whether the binding point gray-scale voltage VBPi is equal to the target voltage, if it is, then perform the next step, otherwise, And return to the execution to change the voltage-dividing position to determine the gray-scale voltage VBPi of the binding point of the binding point; determine whether the number of the binding point of the selected binding point is less than the highest binding point number, i ⁇ Max?
  • the voltage adjustment method of the present invention can further optimize the low gray-scale voltage accuracy, improve the display effect, and reduce the number of voltage divider resistors by changing the voltage mapping mode of the tie point, compared with the setting of the voltage divider resistor string of the existing gamma voltage divider circuit. Reduce the complexity and cost of the gamma divider circuit.
  • the voltage adjustment method of the present invention is applicable to the setting of the voltage dividing resistor string of the OLED panel, and is also applicable to the setting of the voltage dividing resistor string of the LCD panel.

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Abstract

一种伽马分压电路、电压调节方法及液晶显示装置，通过改变绑点电压映射方式，较现有的伽马分压电路的分压电阻串设置，可以进一步优化低灰阶电压精度，改善显示效果，同时减少分压电阻数量，降低伽马分压电路的复杂度和成本。本伽马分压电路适用OLED面板的分压电阻串设置，同样也适用LCD面板的分压电阻串设置。

Description

伽马分压电路、电压调节方法及液晶显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种伽马分压电路、电压调节方法及液晶显示装置。
 背景技术
近年来OLED（Organic Light Emitting Diode，有机发光二极管）显示技术的快速发展，推动曲面和柔性显示触控产品迅速进入市场，相关领域技术更新也是日新月异。OLED是指利用有机半导体材料和发光材料在电场驱动下，通过载流子注入和复合导致发光的二极管。OLED显示装置具有高对比度，广视角，低功耗，体积更薄等优点，被业界公认为是最有发展潜力的显示装置。AMOLED（Active-matrix organic light emitting diode，有源矩阵有机发光二极管）起源于OLED显示技术。AMOLED具有自发光的特性，因此AMOLED面板视角广、色饱和度高，尤其是其驱动电压低且功耗低，加上反应快、重量轻、厚度薄，构造简单，成本低等，被视为最具前途的产品之一。
参考图1，现有的OLED驱动电路示意图，所述OLED驱动电路包括：第一薄膜晶体管T1、第二薄膜晶体管T2、及电容Cst，其中第一薄膜晶体管T1为开关TFT，第二薄膜晶体管T2为驱动TFT，电容Cst为存储电容。具体地，第一薄膜晶体管T1的源极电性连接于第一节点G、其栅极接入扫描信号Scan，而其漏极接入数据电压Vdata；第二薄膜晶体管T2的源极电性连接有机发光二极管D0的阳极、其漏极接入电源电压OVDD、而其栅极电性连接于第一节点G；有机发光二极管D0的阴极接入公共接地电压OVSS；电容Cst的一端电性连接第二薄膜晶体管T2的栅极，另一端接入电源电压OVDD。OLED面板显示时，扫描信号Scan控制T1导通，数据电压Vdata经过T1进入到T2的栅极及电容Cst；然后T1关断，由于电容Cst的存储作用，T2的栅极电压仍可继续保持数据电压，使得T2处于导通状态，驱动电流通过T2进入有机发光二极管D0，驱动有机发光二极管D0发光。数据电压Vdata的大小可以控制有机发光二极管D0发光的亮度，因此，驱动芯片需要给出精确的数据电压Vdata，来保证OLED面板的正常显示，一般该数据电压Vdata由驱动芯片中的伽马（GAMMA）分压电路产生。
参考图2，现有的伽马分压电路示意图。按照人眼对光亮的感应程度，通常需要对显示设备进行伽马调节来改善显示效果。伽马调节由驱动芯片内的伽马分压电路来实现，伽马分压电路需要大量的电阻串来分压，以输出合适的电压。如图1所示，现有伽马分压电路由多个分压电阻串联组成，电阻越多，分压精度越高，本实施例中，电阻串由2048个分压电阻R0组成。对于OLED面板来说，每一个灰阶值都会对应一个辉度(luminance) 值。绑点（Band Point，简称BP）指固定的几个灰阶，每一灰阶值皆有相应的灰阶电压。一般调节好绑点对应的绑点灰阶电压，其中间区域的灰阶电压可以由绑点灰阶电压VBPi插值得到。现有伽马分压电路通过依次调节各个绑点BPi，在分压电阻上寻找合适的绑点灰阶电压VBPi，最终使辉度-绑点曲线满足制定伽马指数关系，如图3所示绑点与辉度值的理想曲线图。如图3所示，OLED面板的分辨率为8位，因此包括256个绑点值BP0-BP255与256个相应的辉度值L0-L255。
 技术问题
一般而言，由于显示面板的对比度(contrast ratio)是取决于最高辉度值L255与最低辉度值L0，故与其相应的最低灰阶绑点电压VGSS与最高灰阶绑点电压VGDD一般是设定为独立的两电压（即分压电阻串两端的电压）。由于分压电阻串的个数固定，所以当电阻串两端的灰阶绑点电压VGDD/VGSS差异变大时，每个电阻所分得的电压也变大。使得在低灰阶区段，无法将每个灰阶的亮度都区分开，如图4所示现有绑点与辉度值的曲线图。按照人眼对光亮的感应程度，通常需要对显示设备进行伽马调节来改善显示效果。伽马调节由驱动芯片内的伽马分压电路来实现，该电路需要大量的电阻串来分压，以输出合适的电压。但由于电阻分压精度不高，导致在低灰阶无法分辨；或者在电阻串中设置相当多的电阻，例如2048个，电阻串消耗大量电阻，这样会增加伽马分压电路的复杂度和成本。
 技术解决方案
本发明的目的在于，提供一种伽马分压电路、电压调节方法及液晶显示装置，通过在分压电阻串中间输入阈值灰阶电压，优化低灰阶电压精度，改善显示效果，解决由于电阻分压精度不高导致在低灰阶无法分辨，或电阻串消耗大量电阻增加伽马分压电路的复杂度和成本的问题。
为实现上述目的，本发明提供了一种伽马分压电路，所述伽马分压电路包括：串联的至少两个灰阶电阻串，每一所述灰阶电阻串包括多个分压电阻以提供多个绑点灰阶电压，每一所述绑点灰阶电压与一绑点相互对应；至少一阈值灰阶电压，输入一相邻的两个灰阶电阻串的公共端；其中，所述阈值灰阶电压大于所述相邻的两个灰阶电阻串的其中一灰阶电阻串的所有绑点灰阶电压，且小于所述相邻的两个灰阶电阻串的另一灰阶电阻串的所有绑点灰阶电压。
为实现上述目的，本发明还提供了一种液晶显示装置，所述液晶显示装置包括伽马分压电路，所述伽马分压电路包括：串联的至少两个灰阶电阻串，每一所述灰阶电阻串包括多个分压电阻以提供多个绑点灰阶电压，每一所述绑点灰阶电压与一绑点相互对应；至少一阈值灰阶电压，输入一相邻的两个灰阶电阻串的公共端；其中，所述阈值灰阶电压大于所述相邻的两个灰阶电阻串的其中一灰阶电阻串的所有绑点灰阶电压，且小于所述相邻的两个灰阶电阻串的另一灰阶电阻串的所有绑点灰阶电压。
为实现上述目的，本发明还提供了一种电压调节方法，用以调节一液晶显示装置中一伽马分压电路所提供的多个绑点灰阶电压，所述电压调节方法包括如下步骤：（1）确定至少一阈值灰阶绑点对应的阈值灰阶电压；（2）依据所有所阈值灰阶绑点，将所述伽马分压电路划分成串联的多个灰阶电阻串，每一所述灰阶电阻串包括多个分压电阻以提供多个绑点灰阶电压，每一所述绑点灰阶电压与一绑点相互对应；（3）提供所述阈值灰阶电压至相邻的两个灰阶电阻串的公共端，其中，所述阈值灰阶电压大于所述相邻的两个灰阶电阻串的其中一灰阶电阻串的所有绑点灰阶电压，且小于所述相邻的两个灰阶电阻串的另一灰阶电阻串的所有绑点灰阶电压；（4）依次选取所述伽马分压电路的绑点，并调节所选绑点的绑点灰阶电压，直到伽马分压电路的所有绑点逐一被调节为止。
 有益效果
本发明通过改变绑点电压映射方式，较现有的伽马分压电路的分压电阻串设置，可以进一步优化低灰阶电压精度，改善显示效果，同时减少分压电阻数量，降低伽马分压电路的复杂度和成本。本发明伽马分压电路适用OLED面板的分压电阻串设置，同样也适用LCD面板的分压电阻串设置。
 附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例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，现有的OLED驱动电路示意图；
图2，现有的伽马分压电路示意图；
图3，绑点与辉度值的理想曲线图；
图4，现有绑点与辉度值的曲线图；
图5，本发明伽马分压电路第一实施例的示意图；
图6，本发明绑点与辉度值的曲线图；
图7，本发明伽马分压电路第二实施例的示意图；
图8，本发明电压调节方法一实施例的架构图；
图9，本发明电压调节方法一实施例的流程图。
 本发明的实施方式
下面详细描述本发明的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
本发明伽马分压电路，包括：串联的至少两个灰阶电阻串，每一所述灰阶电阻串包括多个分压电阻以提供多个绑点灰阶电压，每一所述绑点灰阶电压与一绑点相互对应；至少一阈值灰阶电压，输入一相邻的两个灰阶电阻串的公共端；其中，所述阈值灰阶电压大于所述相邻的两个灰阶电阻串的其中一灰阶电阻串的所有绑点灰阶电压，且小于所述相邻的两个灰阶电阻串的另一灰阶电阻串的所有绑点灰阶电压。
本发明伽马分压电路的阈值灰阶电压（VGth）对应的阈值灰阶绑点（BPth）可以用于区分电压跨度较大的中、高灰阶和难以区分电压的低灰阶。可以根据显示设备的显示效果设计中高灰阶和低灰阶两段灰阶电阻串，输入一组阈值灰阶电压；也可以根据显示设备的显示效果设计高、中、低三段灰阶电阻串，即输入两组阈值灰阶电压，或者更多。设置低灰阶绑点电压前，要先确定阈值灰阶绑点对应的阈值灰阶电压值，并将这个阈值灰阶电压值输入到相邻两分压电阻串的公共端。在低灰阶段，需要有足够多的分压电阻使每个灰阶电压足够精细，进而使所显示的灰阶都可分辨。本发明伽马分压电路通过改变绑点电压映射方式，较现有的伽马分压电路的分压电阻串设置，可以进一步优化低灰阶电压精度，改善显示效果，同时减少分压电阻数量，降低伽马分压电路的复杂度和成本。本发明伽马分压电路适用OLED面板的分压电阻串设置，同样也适用LCD面板的分压电阻串设置。
参考图5，本发明伽马分压电路第一实施例的示意图。在本实施例中，所述伽马分压电路包括：第一灰阶电阻串51，第二灰阶电阻串52以及第一阈值灰阶电压VGth1。
所述第一灰阶电阻串51包括M个第一分压电阻R1，所述第一灰阶电阻串51提供M个第一绑点灰阶电压VBPm，每一所述第一绑点灰阶电压VBPm与一第一绑点BPm相互对应。
所述第二灰阶电阻串52与所述第一灰阶电阻串51串联，所述第二灰阶电阻串52包括N个第二分压电阻R2，所述第二灰阶电阻串52提供N个第二绑点灰阶电压VBPn，每一所述第二绑点灰阶电压VBPn与一第二绑点BPn相互对应。
所述第一阈值灰阶电压VGth1，输入所述第二灰阶电阻串52与所述第一灰阶电阻串51的公共端（即第一阈值灰阶绑点BPth1）。其中，所述第一阈值灰阶电压VGth1大于所有所述第二绑点灰阶电压VBPn，且小于所有所述第一绑点灰阶电压VBPm。其中，第一灰阶电阻串51的顶端为最高灰阶绑点电压VGDD，相应的，第二灰阶电阻串52的底端为最低灰阶绑点电压VGSS，VGDD、VGSS设定为独立的两电压。
具体的，依据一第一阈值灰阶绑点BPth1将所述伽马分压电路中的所有绑点分成M个第一绑点BPm与N个第二绑点BPn；将与所述M个第一绑点BPm对应的M个第一分压电阻R1设定为所述第一灰阶电阻串51；以及将与所述N个第二绑点BPn对应的N个第二分压电阻R2设定为所述第二灰阶电阻串52；其中，所述第一阈值灰阶绑点BPth1对应的灰阶电压为所述第一阈值灰阶电压VGth1。
在本实施例中，第一阈值灰阶绑点BPth1用于区分电压跨度较大的中高灰阶和难以区分电压的低灰阶，中高灰阶绑点和低灰阶绑点中间需要输入第一阈值灰阶电压VGth1。即设置低灰阶绑点电压前，先确定阈值灰阶绑点对应的阈值灰阶电压值，并将这个阈值灰阶电压值输入到相邻两分压电阻串的公共端。在低灰阶段，提供足够多的分压电阻使每个灰阶电压足够精细，进而使所显示的灰阶都可分辨。
在本实施例中，在中高灰阶区域段（即第一灰阶电阻串51），每个分压电阻的分压值为：
VR1=（VGDD- VGth1）/ M，
其中，VGDD为最高灰阶绑点电压，VGth1为第一阈值灰阶电压，M为第一灰阶电阻串51中分压电阻R1的数量。
在本实施例中，在低灰阶区域段（即第二灰阶电阻串52），每个分压电阻的分压值为：
VR2=（VGth1- VGSS）/ N，
其中，VGth1为第一阈值灰阶电压，VGSS为最低灰阶绑点电压，N为第二灰阶电阻串52中分压电阻R2的数量。
本发明伽马分压电路在设置低灰阶绑点电压前，先确定阈值灰阶绑点对应的阈值灰阶电压值，并将这个阈值灰阶电压值输入到相邻两分压电阻串的公共端，通过依次调节各个绑点BPm、BPn，在分压电阻上寻找合适的绑点灰阶电压，最终使辉度-绑点曲线满足制定伽马指数关系，如图6所示本发明绑点与辉度值的曲线图。如图6所示，OLED面板的分辨率为8位，因此包括256个绑点值BP0-BP255与256个相应的辉度值L0-L255。
参考图7，本发明伽马分压电路第二实施例的示意图。在本实施例中，所述伽马分压电路包括：第一灰阶电阻串71，第二灰阶电阻串72、第三灰阶电阻串73以及第一阈值灰阶电压VGth1、第二阈值灰阶电压VGth2。
所述第一灰阶电阻串71包括M个第一分压电阻R1，所述第一灰阶电阻串71提供M个第一绑点灰阶电压VBPm，每一所述第一绑点灰阶电压VBPm与一第一绑点BPm相互对应。
所述第二灰阶电阻串72与所述第一灰阶电阻串71串联，所述第二灰阶电阻串72包括N个第二分压电阻R2，所述第二灰阶电阻串72提供N个第二绑点灰阶电压VBPn，每一所述第二绑点灰阶电压VBPn与一第二绑点BPn相互对应。
所述第三灰阶电阻串73与所述第二灰阶电阻串72串联，所述第三灰阶电阻串73包括K个第三分压电阻R3，所述第三灰阶电阻串73提供K个第三绑点灰阶电压VBPk，每一所述第三绑点灰阶电压VBPk与一第三绑点BPk相互对应。
所述第一阈值灰阶电压VGth1，输入所述第二灰阶电阻串72与所述第一灰阶电阻串71的公共端（即第一阈值灰阶绑点BPth1）。其中，所述第一阈值灰阶电压VGth1大于所有所述第二绑点灰阶电压VBPn，且小于所有所述第一绑点灰阶电压VBPm。
所述第二阈值灰阶电压VGth2，输入所述第三灰阶电阻串73与所述第二灰阶电阻串72的公共端（即第二阈值灰阶绑点BPth2）。其中，所述第二阈值灰阶电压VGth2大于所有所述第三绑点灰阶电压VBPk，且小于所有所述第二绑点灰阶电压VBPn。
其中，第一灰阶电阻串71的顶端为最高灰阶绑点电压VGDD，相应的，第三灰阶电阻串73的底端为最低灰阶绑点电压VGSS，VGDD、VGSS设定为独立的两电压。
具体的，依据一第一阈值灰阶绑点BPth1和一第二阈值灰阶绑点BPth2将所述伽马分压电路中的所有绑点分成M个第一绑点BPm、N个第二绑点BPn与K个第三绑点BPk；将与所述M个第一绑点BPm对应的M个第一分压电阻R1设定为所述第一灰阶电阻串71；将与所述N个第二绑点BPn对应的N个第二分压电阻R2设定为所述第二灰阶电阻串72；以及将与所述K个第三绑点BPk对应的K个第三分压电阻R3设定为所述第三灰阶电阻串72；其中，所述第一阈值灰阶绑点BPth1对应的灰阶电压为所述第一阈值灰阶电压VGth1，所述第二阈值灰阶绑点BPth2对应的灰阶电压为所述第二阈值灰阶电压VGth2。
在本实施例中，第一阈值灰阶绑点BPth1用于区分电压跨度较大的中灰阶和高灰阶，高灰阶绑点和中灰阶绑点中间需要输入第一阈值灰阶电压VGth1；第二阈值灰阶绑点BPth2用于区分电压跨度较大的中灰阶和难以区分电压的低灰阶，中灰阶绑点和低灰阶绑点中间需要输入第二阈值灰阶电压VGth2。同样在设置低灰阶绑点电压前，先确定两组阈值灰阶绑点对应的阈值灰阶电压值，并将这两组阈值灰阶电压值输入到相邻两分压电阻串的公共端。在低灰阶段，提供足够多的分压电阻使每个灰阶电压足够精细，进而使所显示的灰阶都可分辨。
在本实施例中，在高灰阶区域段（即第一灰阶电阻串71），每个分压电阻的分压值为：
VR1=（VGDD- VGth1）/ M，
其中，VGDD为最高灰阶绑点电压，VGth1为第一阈值灰阶电压，M为第一灰阶电阻串51中分压电阻R1的数量。
在本实施例中，在中灰阶区域段（即第二灰阶电阻串72），每个分压电阻的分压值为：
VR2=（VGth1- VGth2）/ N，
其中，VGth1为第一阈值灰阶电压，VGth2为第一阈值灰阶电压，N为第二灰阶电阻串72中分压电阻R2的数量。
在本实施例中，在低灰阶区域段（即第按灰阶电阻串73），每个分压电阻的分压值为：
VR3=（VGth2- VGSS）/ K，
其中，VGth2为第二阈值灰阶电压，VGSS为最低灰阶绑点电压，K为第三灰阶电阻串73中分压电阻R3的数量。
本发明伽马分压电路在设置低灰阶绑点电压前，先确定两组阈值灰阶绑点对应的阈值灰阶电压值，并将这两组阈值灰阶电压值输入到相邻两分压电阻串的公共端，通过依次调节各个绑点BPm、BPn、BPk，在分压电阻上寻找合适的绑点灰阶电压，最终使辉度-绑点曲线满足制定伽马指数关系，可参考图6所示本发明绑点与辉度值的曲线图。
本发明还提供了一种液晶显示装置，所述液晶显示装置采用本发明上述任一实施例所述的伽马分压电路。所述伽马分压电路产生数据电压Vdata，来保证液晶显示装置中的显示面板的正常显示。所述显示面板可以为OLED面板，也可以为LCD面板。
本发明还提供了一种电压调节方法，用以调节一液晶显示装置中一伽马分压电路所提供的多个绑点灰阶电压。参考图8，本发明电压调节方法一实施例的架构图，所述电压调节方法包括如下步骤：S81：确定至少一阈值灰阶绑点对应的阈值灰阶电压；S82：依据所有所阈值灰阶绑点，将所述伽马分压电路划分成串联的多个灰阶电阻串，每一所述灰阶电阻串包括多个分压电阻以提供多个绑点灰阶电压，每一所述绑点灰阶电压与一绑点相互对应；S83：提供所述阈值灰阶电压至相邻的两个灰阶电阻串的公共端，其中，所述阈值灰阶电压大于所述相邻的两个灰阶电阻串的其中一灰阶电阻串的所有绑点灰阶电压，且小于所述相邻的两个灰阶电阻串的另一灰阶电阻串的所有绑点灰阶电压；S84：依次选取所述伽马分压电路的绑点，并调节所选绑点的绑点灰阶电压，直到伽马分压电路的所有绑点逐一被调节为止。
可选的，本发明电压调节方法可以根据显示设备的显示效果设计中高灰阶和低灰阶两段灰阶电阻串，输入一组阈值灰阶电压。设置低灰阶绑点电压前，先确定阈值灰阶绑点对应的阈值灰阶电压值，并将这个阈值灰阶电压值输入到相邻两分压电阻串的公共端。在低灰阶段，提供足够多的分压电阻使每个灰阶电压足够精细，进而使所显示的灰阶都可分辨。具体的：步骤S81进一步包括：确定第一阈值灰阶绑点对应的第一阈值灰阶电压；步骤S82进一步包括：依据所述第一阈值灰阶绑点，将所述伽马分压电路中的所有绑点分成多个第一绑点与多个第二绑点，将与所述多个第一绑点对应的多个第一分压电阻设定为第一灰阶电阻串，以及将与所述多个第二绑点对应的多个第二分压电阻设定为第二灰阶电阻串；步骤S83进一步包括：提供所述第一阈值灰阶电压至所述第一灰阶电阻串与所述第二灰阶电阻串的公共端，其中，所述第一阈值灰阶电压大于所述第二灰阶电阻串的所有绑点灰阶电压，且小于所述第一阶电阻串的所有绑点灰阶电压。
可选的，本发明电压调节方法可以根据显示设备的显示效果设计高、中、低三段灰阶电阻串，即输入两组阈值灰阶电压，或者更多。设置低灰阶绑点电压前，先确定两组阈值灰阶绑点对应的两组阈值灰阶电压值，并将这两组阈值灰阶电压值分别输入到相邻两分压电阻串的公共端。在低灰阶段，提供足够多的分压电阻使每个灰阶电压足够精细，进而使所显示的灰阶都可分辨。具体的：步骤S81进一步包括：确定第一阈值灰阶绑点对应的第一阈值灰阶电压，以及确定第二阈值灰阶绑点对应的第二阈值灰阶电压；步骤S82进一步包括：依据所述第一阈值灰阶绑点和所述第二阈值灰阶绑点，将所述伽马分压电路中的所有绑点分成多个第一绑点、多个第二绑点与多个第三绑点，将与所述多个第一绑点对应的多个第一分压电阻设定为第一灰阶电阻串；将与所述多个第二绑点对应的多个第二分压电阻设定为第二灰阶电阻串，以及将与所述多个第三绑点对应的多个第三分压电阻设定为第三灰阶电阻串；步骤S83进一步包括：提供所述第一阈值灰阶电压至所述第一灰阶电阻串与第二灰阶电阻串的公共端，提供所述第二阈值灰阶电压至所述第二灰阶电阻串与所述第三灰阶电阻串的公共端，其中，所述第一阈值灰阶电压大于所述第二灰阶电阻串的所有绑点灰阶电压，且小于所述第一阶电阻串的所有绑点灰阶电压，所述第二阈值灰阶电压大于所有所述第三绑点灰阶电压且小于所有所述第二绑点灰阶电压。
依次选取所述伽马分压电路的绑点，并调节所选绑点的绑点灰阶电压，直到伽马分压电路的所有绑点逐一被调节为止，具体可以为：1）根据绑点编号由低到高依次选取所述伽马分压电路的绑点；2）确定所选绑点的绑点灰阶电压；3）判断所确定的绑点灰阶电压是否等于预设目标电压，若是，则执行步骤4），否则，改变分压位置并返回执行步骤2）；4）判断所选绑点的绑点编号是否小于最高绑点编号，若是，则结束所述绑点的调节，否则，更新绑点编号并返回执行步骤1）。为了确保每一绑点都可依序被调节，于步骤3）将判别这些绑点是否已逐一被选取。当这些绑点尚未逐一被选取时，改变分压位置并返回执行步骤2），以选取其余的绑点来进行调节。相对地，当这些绑点已逐一被选取时，则代表这些绑点已逐一被调节，故将结束这些绑点的调节。
参考图9，本发明电压调节方法一实施例的流程图。在本实施例中，在调节绑点Bpi前，先确定阈值灰阶Gth对应的阈值灰阶电压VGth（VGth= VBPth）；之后，根据绑点编号由低到高依次选取所述伽马分压电路的绑点BPi，调节绑点BPi；之后改变分压位置，确定绑点的绑点灰阶电压VBPi；判断绑点灰阶电压VBPi是否等于目标电压，若是，则执行下一步骤，否则，并返回执行改变分压位置，确定绑点的绑点灰阶电压VBPi；判断所选绑点的绑点编号是否小于最高绑点编号，i < Max? 若是，则结束绑点的调节，否则，更新绑点编号i = i + 1，重新选取绑点BPi，把那个调节绑点BPi；直到确保每一绑点都依序被调节，最终达到图6所示的曲线图的效果。
本发明电压调整方法，通过改变绑点电压映射方式，较现有的伽马分压电路的分压电阻串设置，可以进一步优化低灰阶电压精度，改善显示效果，同时减少分压电阻数量，降低伽马分压电路的复杂度和成本。本发明电压调整方法适用OLED面板的分压电阻串设置，同样也适用LCD面板的分压电阻串设置。
 工业实用性
本申请的主题可以在工业中制造和使用，具备工业实用性。

Claims (14)

  1. 一种伽马分压电路，其中，所述伽马分压电路包括：串联的至少两个灰阶电阻串，每一所述灰阶电阻串包括多个分压电阻以提供多个绑点灰阶电压，每一所述绑点灰阶电压与一绑点相互对应；至少一阈值灰阶电压，输入一相邻的两个灰阶电阻串的公共端；其中，所述阈值灰阶电压大于所述相邻的两个灰阶电阻串的其中一灰阶电阻串的所有绑点灰阶电压，且小于所述相邻的两个灰阶电阻串的另一灰阶电阻串的所有绑点灰阶电压。
  2. 如权利要求1所述的伽马分压电路，其中，所述伽马分压电路包括：第一灰阶电阻串，所述第一灰阶电阻串包括多个第一分压电阻，所述第一灰阶电阻串提供多个第一绑点灰阶电压，每一所述第一绑点灰阶电压与一第一绑点相互对应；第二灰阶电阻串，所述第二灰阶电阻串与所述第一灰阶电阻串串联，所述第二灰阶电阻串包括多个第二分压电阻，所述第二灰阶电阻串提供多个第二绑点灰阶电压，每一所述第二绑点灰阶电压与一第二绑点相互对应；第一阈值灰阶电压，输入所述第二灰阶电阻串与所述第一灰阶电阻串的公共端；其中，所述第一阈值灰阶电压大于所有所述第二绑点灰阶电压，且小于所有所述第一绑点灰阶电压。
  3. 如权利要求2所述的伽马分压电路，其中，依据一第一阈值灰阶绑点将所述伽马分压电路中的所有绑点分成多个第一绑点与多个第二绑点；将与所述多个第一绑点对应的多个第一分压电阻设定为所述第一灰阶电阻串；以及将与所述多个第二绑点对应的多个第二分压电阻设定为所述第二灰阶电阻串；其中，所述第一阈值灰阶绑点对应的灰阶电压为所述第一阈值灰阶电压。
  4. 如权利要求1所述的伽马分压电路，其中，所述伽马分压电路包括：第一灰阶电阻串，所述第一灰阶电阻串包括多个第一分压电阻，所述第一灰阶电阻串提供多个第一绑点灰阶电压，每一所述第一绑点灰阶电压与一第一绑点相互对应；第二灰阶电阻串，所述第二灰阶电阻串与所述第一灰阶电阻串串联，所述第二灰阶电阻串包括多个第二分压电阻，所述第二灰阶电阻串提供多个第二绑点灰阶电压，每一所述第二绑点灰阶电压与一第二绑点相互对应；第三灰阶电阻串，与所述第二灰阶电阻串串联，所述第三灰阶电阻串包括多个第三分压电阻，所述第三灰阶电阻串提供多个第三绑点灰阶电压，每一所述第三绑点灰阶电压与一第三绑点相互对应；第一阈值灰阶电压，输入所述第一灰阶电阻串与所述第二灰阶电阻串的公共端；第二阈值灰阶电压，输入所述第二灰阶电阻串与所述第三灰阶电阻串的公共端；其中，所述第一阈值灰阶电压大于所有所述第二绑点灰阶电压且小于所有所述第一绑点灰阶电压，所述第二阈值灰阶电压大于所有所述第三绑点灰阶电压且小于所有所述第二绑点灰阶电压。
  5. 如权利要求4所述的伽马分压电路，其中，依据一第一阈值灰阶绑点和一第二阈值灰阶绑点将所述伽马分压电路中的所有绑点分成多个第一绑点、多个第二绑点与多个第三绑点；将与所述多个第一绑点对应的多个第一分压电阻设定为所述第一灰阶电阻串；将与所述多个第二绑点对应的多个第二分压电阻设定为所述第二灰阶电阻串；以及将与所述多个第三绑点对应的多个第三分压电阻设定为所述第三灰阶电阻串；其中，所述第一阈值灰阶绑点对应的灰阶电压为所述第一阈值灰阶电压，所述第二阈值灰阶绑点对应的灰阶电压为所述第二阈值灰阶电压。
  6. 一种液晶显示装置，其中，所述液晶显示装置包括伽马分压电路，所述伽马分压电路包括：串联的至少两个灰阶电阻串，每一所述灰阶电阻串包括多个分压电阻以提供多个绑点灰阶电压，每一所述绑点灰阶电压与一绑点相互对应；至少一阈值灰阶电压，输入一相邻的两个灰阶电阻串的公共端；其中，所述阈值灰阶电压大于所述相邻的两个灰阶电阻串的其中一灰阶电阻串的所有绑点灰阶电压，且小于所述相邻的两个灰阶电阻串的另一灰阶电阻串的所有绑点灰阶电压。
  7. 如权利要求6所述的液晶显示装置，其中，所述伽马分压电路包括：第一灰阶电阻串，所述第一灰阶电阻串包括多个第一分压电阻，所述第一灰阶电阻串提供多个第一绑点灰阶电压，每一所述第一绑点灰阶电压与一第一绑点相互对应；第二灰阶电阻串，所述第二灰阶电阻串与所述第一灰阶电阻串串联，所述第二灰阶电阻串包括多个第二分压电阻，所述第二灰阶电阻串提供多个第二绑点灰阶电压，每一所述第二绑点灰阶电压与一第二绑点相互对应；第一阈值灰阶电压，输入所述第二灰阶电阻串与所述第一灰阶电阻串的公共端；其中，所述第一阈值灰阶电压大于所有所述第二绑点灰阶电压，且小于所有所述第一绑点灰阶电压。
  8. 如权利要求7所述的液晶显示装置，其中，依据一第一阈值灰阶绑点将所述伽马分压电路中的所有绑点分成多个第一绑点与多个第二绑点；将与所述多个第一绑点对应的多个第一分压电阻设定为所述第一灰阶电阻串；以及将与所述多个第二绑点对应的多个第二分压电阻设定为所述第二灰阶电阻串；其中，所述第一阈值灰阶绑点对应的灰阶电压为所述第一阈值灰阶电压。
  9. 如权利要求6所述的液晶显示装置，其中，所述伽马分压电路包括：第一灰阶电阻串，所述第一灰阶电阻串包括多个第一分压电阻，所述第一灰阶电阻串提供多个第一绑点灰阶电压，每一所述第一绑点灰阶电压与一第一绑点相互对应；第二灰阶电阻串，所述第二灰阶电阻串与所述第一灰阶电阻串串联，所述第二灰阶电阻串包括多个第二分压电阻，所述第二灰阶电阻串提供多个第二绑点灰阶电压，每一所述第二绑点灰阶电压与一第二绑点相互对应；第三灰阶电阻串，与所述第二灰阶电阻串串联，所述第三灰阶电阻串包括多个第三分压电阻，所述第三灰阶电阻串提供多个第三绑点灰阶电压，每一所述第三绑点灰阶电压与一第三绑点相互对应；第一阈值灰阶电压，输入所述第一灰阶电阻串与所述第二灰阶电阻串的公共端；第二阈值灰阶电压，输入所述第二灰阶电阻串与所述第三灰阶电阻串的公共端；其中，所述第一阈值灰阶电压大于所有所述第二绑点灰阶电压且小于所有所述第一绑点灰阶电压，所述第二阈值灰阶电压大于所有所述第三绑点灰阶电压且小于所有所述第二绑点灰阶电压。
  10. 如权利要求9所述的液晶显示装置，其中，依据一第一阈值灰阶绑点和一第二阈值灰阶绑点将所述伽马分压电路中的所有绑点分成多个第一绑点、多个第二绑点与多个第三绑点；将与所述多个第一绑点对应的多个第一分压电阻设定为所述第一灰阶电阻串；将与所述多个第二绑点对应的多个第二分压电阻设定为所述第二灰阶电阻串；以及将与所述多个第三绑点对应的多个第三分压电阻设定为所述第三灰阶电阻串；其中，所述第一阈值灰阶绑点对应的灰阶电压为所述第一阈值灰阶电压，所述第二阈值灰阶绑点对应的灰阶电压为所述第二阈值灰阶电压。
  11. 一种电压调节方法，用以调节一液晶显示装置中一伽马分压电路所提供的多个绑点灰阶电压，其中，所述电压调节方法包括如下步骤：（1）确定至少一阈值灰阶绑点对应的阈值灰阶电压；（2）依据所有所阈值灰阶绑点，将所述伽马分压电路划分成串联的多个灰阶电阻串，每一所述灰阶电阻串包括多个分压电阻以提供多个绑点灰阶电压，每一所述绑点灰阶电压与一绑点相互对应；（3）提供所述阈值灰阶电压至相邻的两个灰阶电阻串的公共端，其中，所述阈值灰阶电压大于所述相邻的两个灰阶电阻串的其中一灰阶电阻串的所有绑点灰阶电压，且小于所述相邻的两个灰阶电阻串的另一灰阶电阻串的所有绑点灰阶电压；（4）依次选取所述伽马分压电路的绑点，并调节所选绑点的绑点灰阶电压，直到伽马分压电路的所有绑点逐一被调节为止。
  12. 如权利要求11所述的方法，其中，步骤（1）进一步包括：确定第一阈值灰阶绑点对应的第一阈值灰阶电压；步骤（2）进一步包括：依据所述第一阈值灰阶绑点，将所述伽马分压电路中的所有绑点分成多个第一绑点与多个第二绑点，将与所述多个第一绑点对应的多个第一分压电阻设定为第一灰阶电阻串，以及将与所述多个第二绑点对应的多个第二分压电阻设定为第二灰阶电阻串；步骤（3）进一步包括：提供所述第一阈值灰阶电压至所述第一灰阶电阻串与所述第二灰阶电阻串的公共端，其中，所述第一阈值灰阶电压大于所述第二灰阶电阻串的所有绑点灰阶电压，且小于所述第一阶电阻串的所有绑点灰阶电压。
  13. 如权利要求11所述的方法，其中，步骤（1）进一步包括：确定第一阈值灰阶绑点对应的第一阈值灰阶电压，以及确定第二阈值灰阶绑点对应的第二阈值灰阶电压步骤（2）进一步包括：依据所述第一阈值灰阶绑点和所述第二阈值灰阶绑点，将所述伽马分压电路中的所有绑点分成多个第一绑点、多个第二绑点与多个第三绑点，将与所述多个第一绑点对应的多个第一分压电阻设定为第一灰阶电阻串；将与所述多个第二绑点对应的多个第二分压电阻设定为第二灰阶电阻串，以及将与所述多个第三绑点对应的多个第三分压电阻设定为第三灰阶电阻串；步骤（3）进一步包括：提供所述第一阈值灰阶电压至所述第一灰阶电阻串与第二灰阶电阻串的公共端，提供所述第二阈值灰阶电压至所述第二灰阶电阻串与所述第三灰阶电阻串的公共端，其中，所述第一阈值灰阶电压大于所述第二灰阶电阻串的所有绑点灰阶电压，且小于所述第一阶电阻串的所有绑点灰阶电压，所述第二阈值灰阶电压大于所有所述第三绑点灰阶电压且小于所有所述第二绑点灰阶电压。
  14. 如权利要求11所述的方法，其中，步骤（4）进一步包括：（41）根据绑点编号由低到高依次选取所述伽马分压电路的绑点；（42）确定所选绑点的绑点灰阶电压；（43）判断所确定的绑点灰阶电压是否等于预设目标电压，若是，则执行步骤（44），否则，改变分压位置并返回执行步骤（42）；（44）判断所选绑点的绑点编号是否小于最高绑点编号，若是，则结束所述绑点的调节，否则，更新绑点编号并返回执行步骤（41）。
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