WO2019071876A1 - 驱动电路和显示装置 - Google Patents

驱动电路和显示装置 Download PDF

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Publication number
WO2019071876A1
WO2019071876A1 PCT/CN2018/073767 CN2018073767W WO2019071876A1 WO 2019071876 A1 WO2019071876 A1 WO 2019071876A1 CN 2018073767 W CN2018073767 W CN 2018073767W WO 2019071876 A1 WO2019071876 A1 WO 2019071876A1
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WIPO (PCT)
Prior art keywords
voltage
reference voltage
gamma
unit
driving circuit
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PCT/CN2018/073767
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English (en)
French (fr)
Inventor
黄北洲
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惠科股份有限公司
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Priority to US16/068,442 priority Critical patent/US20210209983A1/en
Publication of WO2019071876A1 publication Critical patent/WO2019071876A1/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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD

Definitions

  • the present application relates to the field of display technologies, and in particular, to a driving circuit and a display device.
  • the system board is connected to a control board (C-Board) through a line, and the control board is connected to the printed circuit board (PCB) by, for example, a flexible flat cable (FFC).
  • the printed circuit board is connected to the display area through a source-chip on film (S-COF) and a gate-on-chip (G-COF).
  • the display driving method includes: the system motherboard transmits a color (for example: R/G/B) compression signal, a control signal, and a power source to the control board.
  • the signal is processed by the Timing Controller (TCON) on the control board, and then transmitted to the source circuit and the gate circuit of the printed circuit board.
  • TCON Timing Controller
  • the necessary data is compared with the source flip chip and the gate flip chip.
  • the power is transmitted to the display area, so that the display obtains power and signals for presenting the picture.
  • the display operation of the display is driven by voltage.
  • the display needs to generate the reference voltage VCOM first.
  • the reference voltage COM has a direct numerical correspondence with the voltage value of the highest voltage and the lowest voltage of the gamma reference voltage Gamma for display.
  • the reference voltage generating unit of the printed circuit board generates the reference voltage VREF, and the reference voltage VREF and the ground voltage GND are transmitted to a voltage adjusting unit, such as a digital voltage regulator (DVR) or a mechanical voltage regulator. (Voltage Regulator, VR).
  • DVR digital voltage regulator
  • VR Voltage Regulator
  • an object of the present invention is to provide a driving circuit and a display device which improve the problem of flickering of a screen displayed on a display panel by adjusting a reference voltage.
  • the driving circuit includes: a reference voltage generating unit that provides a first reference voltage; a gamma voltage generating unit that receives the first reference voltage from the reference voltage generating unit and outputs the plurality a gamma reference voltage; a voltage adjustment unit that outputs a reference voltage; wherein the voltage adjustment unit uses a plurality of voltage values of the plurality of gamma reference voltages as a second reference voltage, and the voltage adjustment unit is configured according to the The second reference voltage adjusts the reference voltage.
  • the plurality of gamma reference voltages are n, wherein n is a positive integer greater than 1, and the number of the plurality of gamma reference voltages is 1 Above and no more than n.
  • n 14 or 18.
  • the plurality of voltage values of the plurality of gamma reference voltages include an ith gamma reference voltage and a jth gamma reference voltage
  • the second reference voltage is the ith gamma
  • i is 1, and j is n.
  • the second reference voltage is an average of the plurality of gamma reference voltages.
  • the gamma voltage generating unit includes a plurality of resistor units, and each of the two adjacent resistor units has a signal output terminal for outputting the plurality of A gamma reference voltage.
  • the gamma voltage generating unit is connected to an amplifying unit, and the amplifying unit performs voltage signal amplification on the plurality of gamma reference voltages.
  • the driving circuit further includes a voltage equalizing unit disposed between the reference voltage generating unit and the voltage adjusting unit.
  • the voltage equalizing unit extracts a plurality of voltage values from all the voltage values of the plurality of gamma reference voltages, and extracts a plurality of voltage values from all the small to large voltage values, and then The two numerical groups are averaged separately as the second reference voltage.
  • the driving circuit further includes a voltage selecting unit disposed between the voltage adjusting unit and the voltage adjusting unit.
  • the voltage selection unit performs a majority sampling from a plurality of voltage values of the plurality of gamma reference voltages.
  • the voltage adjustment unit is a digital voltage regulator or a mechanical voltage regulator.
  • a further object of the present application is a driving circuit comprising: a reference voltage generating unit that provides a first reference voltage; a gamma voltage generating unit that receives the first reference voltage from the reference voltage generating unit and outputs n a gamma reference voltage, where n is 14 or 18; a voltage regulating unit, the voltage regulating unit outputs a reference voltage; wherein the voltage adjusting unit outputs the first gamma according to a signal output order of the n gamma reference voltages a difference between the horse reference voltage and the nth gamma reference voltage as a second reference voltage, the voltage adjustment unit adjusting the reference voltage according to the second reference voltage, the first gamma reference voltage being the n a maximum value among the gamma reference voltages, the nth gamma reference voltage being a minimum of the n gamma reference voltages.
  • a second object of the present application is a display device comprising: a display panel including a display area and a fan-out area; a printed circuit board connected to the display panel; a reference voltage generating unit disposed on the printing a circuit board, the reference voltage generating unit provides a first reference voltage; a gamma voltage generating unit is formed in the fan-out area, the gamma voltage generating unit receives the first reference from the reference voltage generating unit a voltage and outputting a plurality of gamma reference voltages; a voltage adjustment unit disposed on the printed circuit board, the voltage adjustment unit outputs a reference voltage; wherein the voltage adjustment unit sets the number of the plurality of gamma reference voltages The voltage value is used as a second reference voltage, and the voltage adjustment unit adjusts the reference voltage according to the second reference voltage.
  • This application can maintain the original process requirements and product cost without significantly changing the premise of the existing production process, and after the display panel is used for a long time, the reference voltage VCOM can still maintain the appropriate voltage value, and with the gamma reference voltage Maintain an appropriate numerical correspondence between the two, and solve the problem that the display panel flickers due to the deviation of the reference voltage from the optimum value, and the brightness is unstable.
  • FIG. 1a is a schematic diagram showing the configuration of a driving circuit of an exemplary display device.
  • FIG. 1b is a partial structural diagram of a driving circuit of an exemplary display device.
  • FIG. 2 is a schematic diagram showing the structure of a driving circuit applied to a display panel according to the method of the present application.
  • FIG. 3 is a schematic diagram showing the structure of a driving circuit applied to a display panel according to the method of the present application.
  • FIG. 4 is a schematic diagram showing the structure of a driving circuit applied to a display panel according to the method of the present application.
  • FIG. 5 is a schematic diagram showing the structure of a driving circuit applied to a display panel according to the method of the present application.
  • FIG. 6 is a schematic diagram showing the structure of a driving circuit applied to a display panel according to the method of the present application.
  • FIG. 7 is a schematic diagram showing the structure of an embodiment applied to a display device according to the method of the present application.
  • the word “comprising” is to be understood to include the component, but does not exclude any other component.
  • “on” means located above or below the target component, and does not mean that it must be on the top based on the direction of gravity.
  • the display panel of the present application may include a first substrate and a second substrate, and the first substrate and the second substrate may be, for example, a Thin Film Transistor (TFT) substrate or a Color Filter (CF) substrate.
  • TFT Thin Film Transistor
  • CF Color Filter
  • the active array switch and the color filter layer of the present application may also be formed on the same substrate.
  • the display panel of the present application may be, for example, a liquid crystal display panel, but is not limited thereto, and may also be an OLED display panel, a W-OLED display panel, a QLED display panel, a plasma display panel, and a curved surface. Display panel or other type of display panel.
  • FIG. 1a is a schematic structural view of a driving circuit of an exemplary display device
  • FIG. 1b is a partial structural schematic view of a driving circuit of an exemplary display device.
  • the driving manner of the display device includes: the system mainboard provides color (for example, R/G/B) compression signals, control signals, and power transmission to the control board 100.
  • the Timing Controller (TCON) 101 on the control board 100 and after processing the signals, together with the power source processed by the driving circuit 200, are transmitted to the printing through, for example, a Flexible Flat Cable (FFC) 102.
  • the source circuit and the gate circuit of the circuit board 103 transmit the necessary data and power to the display area 106 through the source flip chip 104 and the gate flip chip 105, so that the display obtains the power and signal for presenting the picture. .
  • TCON Timing Controller
  • FFC Flexible Flat Cable
  • the driving circuit 200 includes a reference voltage generating unit 210 , a gamma voltage generating unit 220 and a voltage adjusting unit 230 .
  • the reference voltage generating unit 210 supplies the reference voltage Vref to the gamma voltage generating unit 220, and the reference voltage Vref is converted by the gamma voltage generating unit 220 to output a plurality of sets of gamma reference voltages gamma1, gamma2, ... gammaN-1, and gammaN. (N is usually 18 or 14).
  • a plurality of sets of gamma reference voltages are respectively provided to the display area 106 of the display panel to drive each pixel circuit of the display panel with grayscale voltages of different sizes.
  • the display needs to generate the reference voltage VCOM first.
  • the reference voltage COM has a direct numerical correspondence with the voltage value of the highest voltage (such as the aforementioned gamma1) and the lowest voltage (such as the aforementioned gammaN) for the gamma reference voltage for display.
  • the reference voltage generating unit 110 generates the reference voltage VREF, and the reference voltage VREF and the ground voltage GND are transmitted to the voltage adjusting unit 130, such as a digital voltage regulator (DVR) or a mechanical voltage. Regulator (Voltage Regulator, VR).
  • DVR digital voltage regulator
  • VR Voltage Regulator
  • the voltage adjustment unit 130 can adjust the required reference voltage VCOM and output the reference voltage VCOM to the display area 106 of the display panel.
  • the operating voltages of the related components such as the reference voltage generating unit 110, the gamma voltage generating unit 120, and the voltage adjusting unit 130 are attenuated, and the reference voltage VCOM, the reference voltage VREF, and the gamma are added.
  • the decay rate of the reference voltage (gamma) is not uniform, which causes the reference voltage VCOM to deviate from the optimum voltage value after prolonged use.
  • the driving circuit includes: a reference voltage generating unit 210 that provides a first reference voltage Vref1; and a gamma voltage generating unit 220 that receives the first from the reference voltage generating unit 210.
  • a reference voltage Vref1 and outputting a plurality of gamma reference voltages (gamma); a voltage adjustment unit 230 that outputs a reference voltage VCOM; the voltage adjustment unit 230 uses a plurality of voltage values of the plurality of gamma reference voltages (gamma) as The second reference voltage Vref2, the voltage adjustment unit 230 adjusts the reference voltage VCOM according to the second reference voltage Vref2.
  • the plurality of gamma reference voltages (gamma) are n, wherein n is a positive integer greater than 1, and a plurality of voltage values of the plurality of gamma reference voltages (gamma), the number thereof It is 1 or more and no more than n. In general, n is 14 or 18.
  • the corresponding gamma reference voltage (gamma) is represented by gamma(1), gamma(2)...gamma(n-1), gamma(n).
  • the number of the plurality of gamma reference voltages is a difference between the ith gamma reference voltage and the jth gamma reference voltage, wherein i, j is 1 or more (including 1) and does not exceed n, and i and j are unequal values.
  • the second reference voltage is paired according to an order in which the voltage adjustment unit 230 outputs the plurality of gamma reference voltages (gamma).
  • the sampling voltage of the second reference voltage Vref2 includes a first gamma reference voltage gamma(1) and a nth gamma reference voltage gamma(n); and the sampling voltage of the second reference voltage Vref2 includes a second gamma Reference voltage gamma(2) and n-1th gamma reference voltage gamma(n-1); sampling voltage of the second reference voltage Vref2 includes third gamma reference voltage gamma(3) and n-2th gamma Reference voltage gamma(n-2).... And so on.
  • FIG. 3 is a schematic diagram showing the structure of a driving circuit applied to a display panel according to the method of the present application.
  • a voltage equalizing unit 240 is disposed between the voltage regulating unit 230 and the reference voltage generating unit 210.
  • the voltage equalizing unit 240 extracts a plurality of voltage values from all the voltage values of the plurality of gamma reference voltages (gamma), and extracts a plurality of voltage values from all the voltage values from small to large.
  • the two numerical groups are then averaged separately as the second reference voltage.
  • the second reference voltage Vref2 is an average of all gamma reference voltages (gamma).
  • a voltage selection unit 250 is disposed between the voltage adjustment unit 230 and the voltage adjustment unit 210.
  • the voltage selection unit performs a majority sampling from a plurality of voltage values of the plurality of gamma reference voltages (gamma), for example, sampling a first gamma reference voltage gamma (1) and a second gamma reference voltage gamma (2)
  • the n/2th gamma reference voltage gamma(n/2), the nth gamma reference voltage gamma(n) but only two of them are selected as the second reference voltage Vref2.
  • the selection logic of the voltage selection unit 250 is determined according to the actual needs of the designer, and is not limited.
  • FIG. 5 is a schematic diagram showing the structure of a driving circuit applied to a display panel according to the method of the present application.
  • the gamma voltage generating unit 220 includes a plurality of resistor units 221, and each two adjacent resistor units 221 of the plurality of resistor units 221 have a signal output terminal for outputting the Multiple gamma reference voltages (gamma).
  • FIG. 6 is a schematic diagram showing the architecture of a driving circuit applied to a display panel according to a method of the present application.
  • the gamma voltage generating unit 220 is connected to the amplifying unit 260, and the amplifying unit 260 performs voltage signal amplification on the plurality of gamma reference voltages (gamma).
  • the voltage conditioning unit 230 is a digital voltage regulator or a mechanical voltage regulator.
  • FIG. 7 is a schematic diagram showing the structure of an embodiment applied to a display device according to the method of the present application.
  • a display device of the present application includes: a display panel including a display area 106 and a fan-out area 107; a printed circuit board 103 connected to the display panel; a reference voltage generated The unit 210 is disposed on the printed circuit board 103.
  • the reference voltage generating unit 210 provides a first reference power Vref1, and a gamma voltage generating unit 220 is formed in the fan-out area 107.
  • the gamma voltage generating unit 220 Receiving the first reference voltage Vref1 from the reference voltage generating unit 210 and outputting a plurality of gamma reference voltages (gamma); the voltage adjusting unit 230 is disposed on the printed circuit board 103, and the voltage adjusting unit 230 outputs The reference voltage VCOM; the amplifying unit 260 is disposed on the printed circuit board 103, and the amplifying unit 260 amplifies the voltage signals of the plurality of gamma reference voltages (gamma), and then passes through the source flip chip 104 and the gate a related element such as a crystalline film 105 to provide a necessary power source for transmission to the display area 106; wherein the voltage adjustment unit 230 converts a plurality of voltage values of the plurality of gamma reference voltages (gamma) A second reference voltage Vref2, the voltage adjustment unit 230 according to the second reference voltage Vref2 to adjust the reference voltage VCOM.
  • the drive circuit of the display device can be any of the foregoing embodiments.
  • the driving circuit includes: a reference voltage generating unit 210 that provides a first reference voltage Vref1; and a gamma voltage generating unit 220 from which the reference voltage generating unit Receiving the first reference voltage Vref1 and outputting n gamma reference voltages (gamma), where n is 14 or 18; the voltage adjusting unit 230 outputs a reference voltage VCOM; the voltage adjusting unit 230 according to the n gamma
  • the signal output order of the horse reference voltage is the difference between the first gamma reference voltage gamma(1) and the nth gamma reference voltage gamma(n) as the second reference voltage Vref2.
  • the voltage adjustment unit 230 uses the difference between the first gamma reference voltage gamma(1) and the nth gamma reference voltage gamma(n) as the second reference voltage according to the signal output order of the n gamma reference voltages. Vref2, the voltage adjusting unit 230 adjusts the reference voltage VCOM according to the second reference voltage Vref2, wherein the first gamma reference voltage gamma(1) is a maximum value of the n gamma reference voltages.
  • the nth gamma reference voltage gamma(n) is a minimum of the n gamma reference voltages.
  • This application can maintain the original process requirements and product cost without significantly changing the premise of the existing production process, and after the display panel is used for a long time, the reference voltage VCOM can still maintain the appropriate voltage value, and with the gamma reference voltage Maintain an appropriate numerical correspondence between the two, and solve the problem that the display panel flickers due to the deviation of the reference voltage from the optimum value, and the brightness is unstable.

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Abstract

一种驱动电路（200），包括：参考电压产生单元（210），提供第一参考电压；伽马电压产生单元（220），从参考电压产生单元（210）接收第一参考电压并输出多个伽马参考电压；电压调节单元（230），输出基准电压；其中，电压调节单元（230）将多个伽马参考电压中的数个电压数值作为第二参考电压，电压调节单元（230）根据第二参考电压调整基准电压。

Description

驱动电路和显示装置 技术领域
本申请涉及一种显示技术领域，特别涉及一种驱动电路和显示装置。
背景技术
TFT(Thin Film Transistor，主动阵列开关)显示器中，系统主板通过线路连接至控制板(Control Board，C-Board)，控制板通过如柔性扁平电缆(Flexible Flat Cable，FFC)连接印刷电路板(PCB)，印刷电路板再通过源极覆晶薄膜(Source-Chip on Film，S-COF)和栅极覆晶薄膜(Gate-Chip on Film，G-COF)与显示区连接。显示器驱动方式包括：系统主板将颜色(例如：R/G/B)压缩信号、控制信号及电源传输至控制板。信号经过控制板上的时序控制器(Timing Controller，TCON)处理后，传输至印刷电路板的源极电路及栅极电路，通过源极覆晶薄膜和栅极覆晶薄膜将必要性的数据与电源传输于显示区，从而使得显示器获得呈现画面需求的电源、信号。
然而，显示器的显示作业是通过电压驱动。显示过程中，显示器需要先产生基准电压VCOM。一般而言，基准电压COM与显示用的伽马参考电压Gamma，其最高电压及最低电压的电压值有直接的数值对应关系。现有技术中，印刷电路板的参考电压产生单元产生参考电压VREF，参考电压VREF及接地电压GND会被传输至电压调节单元，如数字电压调节器(Digital Voltage Regulator，DVR)或机械电压调节器(Voltage Regulator，VR)。根据分压原理，电压调节单元即可调节得到需求的基准电压VCOM，输出至显示面板。
但随着使用时间的延长，相关组件的工作电压会有所衰减，再加上基准电压VCOM、参考电压VREF与伽马参考电压Gamma的衰减速度并不一致，会导致长时间使用后，基准电压VCOM偏离最佳电压值，如此显示面板取得的各类电压，彼此的数值关系即有偏差，进而造成闪烁等不良问题。
发明内容
为了解决上述技术问题，本申请的目的在于，提供一种驱动电路和显示装置，通过调整基准电压，改善显示面板呈现画面的闪烁等问题。
本申请的目的及解决其技术问题是采用以下技术方案来实现的。依据本申请提出的一种驱动电路，所述驱动电路包括：参考电压产生单元，提供第一参考电压；伽马电压产生单元，从所述参考电压产生单元接收所述第一参考电压并输出多个伽马参考电压；电压调节单元，输出基准电压；其中，所述电压调节单元将所述多个伽马参考电压中的数个电压数值作为第二参考电压，所述电压 调节单元依据所述第二参考电压调整所述基准电压。
本申请解决其技术问题还可采用以下技术措施进一步实现。
在本申请的一实施例中，所述多个伽马参考电压为n个，其中n为大于1的正整数，所述多个伽马参考电压中的数个电压数值，其数量是为1以上且不超过n个。
在本申请的一实施例中，n为14或18。
在本申请的一实施例中，所述多个伽马参考电压中的数个电压数值包括第i伽马参考电压与第j伽马参考电压，所述第二参考电压是所述第i伽马参考电压与所述第j伽马参考电压的差值，其中i，j为1以上且不超过n，且i与j为不等值。
在本申请的一实施例中，i为1，j为n。
在本申请的一实施例中，所述第二参考电压是所述多个伽马参考电压的平均值。
在本申请的一实施例中，所述伽马电压产生单元包括多个电阻单元，所述多个电阻单元的每两个相邻的电阻单元之间具有信号输出端，用于输出所述多个伽马参考电压。
在本申请的一实施例中，所述伽马电压产生单元连接放大单元，所述放大单元对所述多个伽马参考电压进行电压信号放大。
在本申请的一实施例中，所述驱动电路更包括一均压单元，设置于所述参考电压产生单元与所述电压调节单元之间。其中，所述均压单元从所述多个伽马参考电压中，由大到小的所有电压数值里取出数个电压数值，及由小到大的所有电压数值里取出数个电压数值，再将两数值群各别平均后，作为所述第二参考电压。
在本申请的一实施例中，所述驱动电路更包括一电压选择单元，设置于所述电压调节单元与所述电压调节单元之间。其中，所述电压选择单元从所述多个伽马参考电压的数个电压数值中进行多数取样。
在本申请的一实施例中，所述电压调节单元为数字式电压调节器或机械式电压调节器。
本申请的又一目的为一种驱动电路，其包括：参考电压产生单元，提供第一参考电压；伽马电压产生单元，从所述参考电压产生单元接收所述第一参考电压并输出n个伽马参考电压，其中n为14或18；电压调节单元，所述电压调节单元输出基准电压；其中，所述电压调节单元依据所述n个伽马参考电压的信号输出顺序，将第1伽马参考电压与第n伽马参考电压的差值作为第二参考电压，所述电压调节单元依据所述第二参考电压调整所述基准电压，所述第1伽马参考电压为所述n个伽马参考电压中的最大值，所述第n伽马参考电压为所述n个伽马参考电压中的最小值。
本申请的次一目的为一种显示装置，其包括：显示面板，所述显示面板包括显示区和扇出区；印刷电路板，连接所述显示面板；参考电压产生单元，设置于所述印刷电路板，所述参考电压 产生单元提供第一参考电压；伽马电压产生单元，形成于所述扇出区，所述伽马电压产生单元，从所述参考电压产生单元接收所述第一参考电压并输出多个伽马参考电压；电压调节单元，设置于所述印刷电路板，所述电压调节单元输出基准电压；其中，所述电压调节单元将所述多个伽马参考电压中的数个电压数值作为第二参考电压，所述电压调节单元依据所述第二参考电压调整所述基准电压。
本申请可以不大幅改变现有生产流程的前提，维持原制程需求和产品成本，且在显示面板在长时间使用后，基准电压VCOM仍能保持在适当的电压数值，并与伽马参考电压之间维持合适的数值对应关系，解决显示面板因基准电压偏离最佳值而造成画面闪烁，亮度不稳定的问题。
附图说明
图1a为范例性的显示装置的驱动电路的配置结构示意图。
图1b为范例性的显示装置的驱动电路局部结构示意图。
图2为显示依据本申请的方法，一实施例应用于显示面板的驱动电路架构示意图。
图3为显示依据本申请的方法，一实施例应用于显示面板的驱动电路架构示意图。
图4为显示依据本申请的方法，一实施例应用于显示面板的驱动电路架构示意图。
图5为显示依据本申请的方法，一实施例应用于显示面板的驱动电路架构示意图。
图6为显示依据本申请的方法，一实施例应用于显示面板的驱动电路架构示意图。
图7为显示依据本申请的方法，一实施例应用于显示装置的架构示意图。
具体实施方式
以下各实施例的说明是参考附加的图式，用以例示本申请可用以实施的特定实施例。本申请所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本申请，而非用以限制本申请。
附图和说明被认为在本质上是示出性的，而不是限制性的。在图中，结构相似的单元是以相同标号表示。另外，为了理解和便于描述，附图中示出的每个组件的尺寸和厚度是任意示出的，但是本申请不限于此。
在附图中，为了清晰起见，夸大了层、膜、面板、区域等的厚度。在附图中，为了理解和便于描述，夸大了一些层和区域的厚度。将理解的是，当例如层、膜、区域或基底的组件被称作“在”另一组件“上”时，所述组件可以直接在所述另一组件上，或者也可以存在中间组件。
另外，在说明书中，除非明确地描述为相反的，否则词语“包括”将被理解为意指包括所述组件，但是不排除任何其它组件。此外，在说明书中，“在......上”意指位于目标组件上方或者下方，而不意指必须位于基于重力方向的顶部上。
为更进一步阐述本申请为达成预定发明目的所采取的技术手段及功效，以下结合附图及较佳实施例，对依据本申请提出的一种驱动电路和显示装置，其具体实施方式、结构、特征及其功效，详细说明如后。
本申请的显示面板可包括第一基板及第二基板，第一基板及第二基板可例如为主动阵列开关(Thin Film Transistor，TFT)基板、彩色滤光层(Color Filter，CF)基板。然不限于此，在一些实施例中，本申请的主动阵列开关及彩色滤光层亦可形成于同一基板上。
在一些实施例中，本申请的所述显示面板可例如为液晶显示面板，然不限于此，其亦可为OLED显示面板，W-OLED显示面板，QLED显示面板，等离子体显示面板，曲面型显示面板或其他类型显示面板。
图1a为范例性的显示装置的驱动电路的配置结构示意图，图1b为范例性的显示装置的驱动电路局部结构示意图。如图1a所示，显示装置的驱动方式包括：系统主板提供颜色(例如：R/G/B)压缩信号、控制信号及电源传输至控制板100。控制板100上的时序控制器(Timing Controller，TCON)101与处理此等信号后，连同被驱动电路200处理的电源，通过如柔性扁平电缆(Flexible Flat Cable，FFC)102，一并传输至印刷电路板103的源极电路及栅极电路，通过源极覆晶薄膜104和栅极覆晶薄膜105将必要性的数据与电源传输于显示区106，从而使得显示器获得呈现画面需求的电源、信号。
如图1b绘示，驱动电路200包括：参考电压产生单元210、伽马电压产生单元220与电压调节单元230。参考电压产生单元210向伽马电压产生单元220提供参考电压Vref，参考电压Vref经伽马电压产生单元220转换后输出多组伽马参考电压gamma1、gamma2......gammaN-1和gammaN(N通常为18或14)。多组伽马参考电压分别被提供显示面板的显示区106，从而以不同大小的灰阶电压驱动显示面板的每一个像素电路。
显示过程中，显示器需要先产生基准电压VCOM。一般而言，基准电压COM与显示用的伽马参考电压，其最高电压(如前述gamma1)及最低电压(如前述gammaN)的电压值有直接的数值对应关系。现有技术中，参考电压产生单元110产生参考电压VREF，参考电压VREF及接地电压GND会被传输至电压调节单元130，电压调节单元130如数字电压调节器(Digital Voltage Regulator，DVR)或机械电压调节器(Voltage Regulator，VR)。根据分压原理，电压调节单元130即可调节得到需求的基准电压VCOM，并将输出基准电压VCOM至显示面板的显示区106。
然而，随着使用时间的延长，参考电压产生单元110、伽马电压产生单元120与电压调节单元130等相关组件的工作电压会有所衰减，再加上基准电压VCOM、参考电压VREF与伽马参考电压(gamma)的衰减速度并不一致，会导致长时间使用后，基准电压VCOM偏离最佳电压值。
图2为显示依据本申请的方法，一实施例应用于显示面板的驱动电路的架构示意图。在本申请一实施例中，所述一种驱动电路，包括：参考电压产生单元210，提供第一参考电压Vref1；伽马电压产生单元220，从所述参考电压产生单元210接收所述第一参考电压Vref1并输出多个伽马参考电压(gamma)；电压调节单元230，输出基准电压VCOM；所述电压调节单元230将所述多个伽马参考电压(gamma)中的数个电压数值作为第二参考电压Vref2，所述电压调节单元230依据所述第二参考电压Vref2调整所述基准电压VCOM。
在一些实施例中，所述多个伽马参考电压(gamma)为n个，其中n为大于1的正整数，所述多个伽马参考电压(gamma)中的数个电压数值，其数量是为1以上且不超过n个。一般而言，n为14或18。为方便说明以下示例，对于相应的伽马参考电压(gamma)会以gamma(1)、gamma(2)…gamma(n-1)、gamma(n)表示。
在一些实施例中，所述多个伽马参考电压中的数个电压数值，其数量是指2个，包括第i伽马参考电压与第j伽马参考电压，所述第二参考电压是所述第i伽马参考电压与所述第j伽马参考电压的差值，其中i，j为1以上(包含1)且不超过n，且i与j为不等值。
在一些实施例中，所述第二参考电压是依据所述电压调节单元230输出所述多个伽马参考电压(gamma)的顺序而成对取样。例如：所述第二参考电压Vref2的取样电压包括第1伽马参考电压gamma(1)与第n伽马参考电压gamma(n)；所述第二参考电压Vref2的取样电压包括第2伽马参考电压gamma(2)与第n-1伽马参考电压gamma(n-1)；所述第二参考电压Vref2的取样电压包括第3伽马参考电压gamma(3)与第n-2伽马参考电压gamma(n-2)…。以此类推。
图3为显示依据本申请的方法，一实施例应用于显示面板的驱动电路的架构示意图。在一些实施例中，所述电压调节单元230与所述参考电压产生单元210之间设置有均压单元240。均压单元240是从所述多个伽马参考电压(gamma)中，由大到小的所有电压数值里取出数个电压数值，及由小到大的所有电压数值里取出数个电压数值，再将两数值群各别平均后，作为所述第二参考电压。
在一些实施例中，所述第二参考电压Vref2是所有伽马参考电压(gamma)的平均值。
图4为显示依据本申请的方法，一实施例应用于显示面板的驱动电路的架构示意图。在一些实施例中，所述电压调节单元230与所述电压调节单元210之间设置有电压选择单元250。所述电压选择单元从所述多个伽马参考电压(gamma)的数个电压数值中进行多数取样，例如取样第1伽马参考电压gamma(1)、第2伽马参考电压gamma(2)、第n/2伽马参考电压gamma(n/2)、第n伽马参考电压gamma(n)，但仅选取其中两个作为所述第二参考电压Vref2。所述电压选择单元250的选择逻辑是依据设计者实际需求而定，并未有所设限。
图5为显示依据本申请的方法，一实施例应用于显示面板的驱动电路的架构示意图。在一些实施例中，所述伽马电压产生单元220包括多个电阻单元221，所述多个电阻单元221的每两个相邻的电阻单元221之间具有信号输出端，用于输出所述多个伽马参考电压(gamma)。
图6为显示依据本申请的方法，一实施例应用于显示面板的驱动电路的架构示意图。在一些实施例中，所述伽马电压产生单元220连接放大单元260，所述放大单元260对所述多个伽马参考电压(gamma)进行电压信号放大。
在一些实施例中，所述电压调节单元230为数字式电压调节器或机械式电压调节器。
图7为显示依据本申请的方法，一实施例应用于显示装置的架构示意图。在本申请一实施例中，本申请的一种显示装置，其包括：显示面板，所述显示面板包括显示区106和扇出区107；印刷电路板103，连接所述显示面板；参考电压产生单元210，设置于所述印刷电路板103，所述参考电压产生单元210提供第一参考电Vref1；伽马电压产生单元220，形成于所述扇出区107，所述伽马电压产生单元220，从所述参考电压产生单元210接收所述第一参考电压Vref1并输出多个伽马参考电压(gamma)；电压调节单元230，设置于所述印刷电路板103，所述电压调节单元230输出基准电压VCOM；放大单元260设置于所述印刷电路板103，所述放大单元260对所述多个伽马参考电压(gamma)进行电压信号放大后，通过源极覆晶薄膜104和栅极覆晶薄膜105等相关元件，以提供必要电源传输于显示区106；其中，所述电压调节单元230将所述多个伽马参考电压(gamma)中的数个电压数值作为第二参考电压Vref2，所述电压调节单元230依据所述第二参考电压Vref2调整所述基准电压VCOM。
在一些实施例中，显示装置的驱动电路可以是前述实施例中的任何一种。
在一些实施例中，在本申请一实施例中，所述一种驱动电路，包括：参考电压产生单元210，提供第一参考电压Vref1；伽马电压产生单元220，从所述参考电压产生单元210接收所述第一参考电压Vref1并输出n个伽马参考电压(gamma)，其中n为14或18；电压调节单元230，输出基准电压VCOM；所述电压调节单元230依据所述n个伽马参考电压的信号输出顺序，将第1伽马参考电压gamma(1)与第n伽马参考电压gamma(n)的差值作为第二参考电压Vref2。所述电压调节单元230依据所述n个伽马参考电压的信号输出顺序，将第1伽马参考电压gamma(1)与第n伽马参考电压gamma(n)的差值作为第二参考电压Vref2，所述电压调节单元230依据所述第二参考电压Vref2调整所述基准电压VCOM，所述第1伽马参考电压gamma(1)为所述n个伽马参考电压中的最大值，所述第n伽马参考电压gamma(n)为所述n个伽马参考电压中的最小值。
本申请可以不大幅改变现有生产流程的前提，维持原制程需求和产品成本，且在显示面板在长时间使用后，基准电压VCOM仍能保持在适当的电压数值，并与伽马参考电压之间维持合适 的数值对应关系，解决显示面板因基准电压偏离最佳值而造成画面闪烁，亮度不稳定的问题。
“在一些实施例中”及“在各种实施例中”等用语被重复地使用。此用语通常不是指相同的实施例；但它也可以是指相同的实施例。“包含”、“具有”及“包括”等用词是同义词，除非其前后文意显示出其它意思。
以上所述，仅是本申请的实施例而已，并非对本申请作任何形式上的限制，虽然本申请已以具体实施例揭露如上，然而并非用以限定本申请，任何熟悉本专业的技术人员，在不脱离本申请技术方案范围内，当可利用上述揭示的技术内容作出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本申请技术方案的内容，依据本申请的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本申请技术方案的范围内。

Claims (20)

  1. 一种驱动电路，包括：
    参考电压产生单元，提供第一参考电压；
    伽马电压产生单元，从所述参考电压产生单元接收所述第一参考电压并输出多个伽马参考电压；
    电压调节单元，输出基准电压；
    其中，所述电压调节单元将所述多个伽马参考电压中的数个电压数值作为第二参考电压，所述电压调节单元依据所述第二参考电压调整所述基准电压。
  2. 如权利要求1所述的驱动电路，其中，所述多个伽马参考电压为n个，其中n为大于1的正整数，所述多个伽马参考电压中的数个电压数值，其数量是为1以上且不超过n个。
  3. 如权利要求2所述的驱动电路，其中，n为14。
  4. 如权利要求2所述的驱动电路，其中，n为18。
  5. 如权利要求2所述的驱动电路，其中，所述多个伽马参考电压中的数个电压数值包括第i伽马参考电压与第j伽马参考电压。
  6. 如权利要求5所述的驱动电路，其中，所述第二参考电压是所述第i伽马参考电压与所述第j伽马参考电压的差值，其中i，j为1以上且不超过n，且i与j为不等值。
  7. 如权利要求6所述的驱动电路，其中，i为1，j为n。
  8. 如权利要求2所述的驱动电路，其中，所述第二参考电压是所述多个伽马参考电压的平均值。
  9. 如权利要求1所述的驱动电路，其中，所述伽马电压产生单元包括多个电阻单元，所述多个电阻单元的每两个相邻的电阻单元之间具有信号输出端。
  10. 如权利要求9所述的驱动电路，其中，所述多个电阻单元用于输出所述多个伽马参考电压。
  11. 如权利要求1所述的驱动电路，其中，所述伽马电压产生单元连接放大单元。
  12. 如权利要求11所述的驱动电路，其中，所述放大单元对所述多个伽马参考电压进行电压信号放大。
  13. 如权利要求1所述的驱动电路，更包括一均压单元，设置于所述参考电压产生单元与所述电压调节单元之间。
  14. 如权利要求13所述的驱动电路，其中，所述均压单元从所述多个伽马参考电压中，由大到小的所有电压数值里取出数个电压数值，及由小到大的所有电压数值里取出数个电压数值，再将两数值群各别平均后，作为所述第二参考电压。
  15. 如权利要求1所述的驱动电路，更包括一电压选择单元，设置于所述电压调节单元与所述电压调节单元之间。
  16. 如权利要求15所述的驱动电路，其中，所述电压选择单元从所述多个伽马参考电压的数个电压数值中进行多数取样。
  17. 如权利要求1所述的驱动电路，其中，所述电压调节单元为数字式电压调节器。
  18. 如权利要求1所述的驱动电路，其中，所述电压调节单元为机械式电压调节器。
  19. 一种显示装置，包括：
    显示面板，所述显示面板包括显示区和扇出区；
    印刷电路板，连接所述显示面板；
    驱动电路，包括：
    参考电压产生单元，设置于所述印刷电路板，所述参考电压产生单元提供第一参考电压；
    伽马电压产生单元，形成于所述扇出区，所述伽马电压产生单元，从所述参考电压产生单元接收所述第一参考电压并输出多个伽马参考电压；
    电压调节单元，设置于所述印刷电路板，所述电压调节单元输出基准电压；
    其中，所述电压调节单元将所述多个伽马参考电压中的数个电压数值作为第二参考电压，所述电压调节单元依据所述第二参考电压调整所述基准电压。
  20. 一种驱动电路，包括：
    参考电压产生单元，提供第一参考电压；
    伽马电压产生单元，从所述参考电压产生单元接收所述第一参考电压并输出n个伽马参考电压，其中n为14或18；
    电压调节单元，输出基准电压；
    其中，所述电压调节单元依据所述n个伽马参考电压的信号输出顺序，将第1伽马参考电压与第n伽马参考电压的差值作为第二参考电压，所述电压调节单元依据所述第二参考电压调整所述基准电压，所述第1伽马参考电压为所述n个伽马参考电压中的最大值，所述第n伽马参考电压为所述n个伽马参考电压中的最小值。
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