WO2016165283A1 - 伽马电压生成电路、驱动单元、显示装置和色坐标调节方法 - Google Patents

伽马电压生成电路、驱动单元、显示装置和色坐标调节方法 Download PDF

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WO2016165283A1
WO2016165283A1 PCT/CN2015/090101 CN2015090101W WO2016165283A1 WO 2016165283 A1 WO2016165283 A1 WO 2016165283A1 CN 2015090101 W CN2015090101 W CN 2015090101W WO 2016165283 A1 WO2016165283 A1 WO 2016165283A1
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Prior art keywords
voltage
gamma
unit
additional
gamma voltage
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PCT/CN2015/090101
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English (en)
French (fr)
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兰传艳
唐秀珠
杨富成
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京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to US14/914,841 priority Critical patent/US20170076648A1/en
Priority to EP15834660.1A priority patent/EP3285251A4/en
Publication of WO2016165283A1 publication Critical patent/WO2016165283A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2003—Display of colours
    • 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • 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
    • G09G2320/0271—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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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 disclosure relates to a gamma voltage generating circuit, a driving unit, a display device, and a color coordinate adjusting method.
  • the liquid crystal display has become a mainstream product in the display field due to its advantages of zero radiation, low power consumption, small heat dissipation, small size, accurate image reproduction, and sharp character display.
  • the liquid crystal display is mainly composed of a display panel, a backlight module and a driver IC.
  • a display panel In a project that displays the same product, there may be multiple suppliers of backlight modules at the same time. Different backlight module manufacturers or display panels produce differences in process and technology, which may result in inconsistencies in single primary colors such as red, green and blue (RGB) in pure white images. As a result, even if the same type of display panel is used, If you use a backlight module from a different manufacturer, the display will be reddish or yellowish.
  • RGB red, green and blue
  • the method of adjusting the 255 gray scale voltage of RGB by the driving chip is different. That is, if a backlight module of a certain manufacturer is combined with a display panel, a white screen is required to be reddish in order to make the final display effect consistent with the preset standard. This requires attenuating the voltages of the other two colors (green and blue) in the white screen, so that the red color is relatively prominent.
  • a gamma voltage generating circuit, a driving unit, a display device, and a color coordinate adjusting method are provided, which are capable of adjusting color coordinates so that display effects of the display device are consistent, and thus the brightness of the white screen is not reduced, thereby Solving the problem that the display device display effect is inconsistent due to differences in materials and processes between various suppliers of the display panel and the backlight module.
  • a gamma voltage generating circuit includes: a buck unit, a voltage dividing unit, and a boosting unit; the buck unit is configured to step down an input source voltage to obtain an initial voltage of a gamma voltage; And dividing an initial voltage of the gamma voltage to generate respective gamma voltages; the boosting unit is configured to generate an additional voltage signal, and the additional voltage signal generated by the boosting unit is used to superimpose the gamma The initial voltage of the horse voltage.
  • a gamma voltage generating circuit including:
  • a buck unit for stepping down the input source voltage to obtain an initial voltage of the gamma voltage
  • a voltage dividing unit configured to divide an initial voltage of the gamma voltage to generate each order gamma voltage
  • a boosting unit for generating an additional voltage signal, the generated additional voltage signal being used to superimpose on the initial voltage of the gamma voltage.
  • the source voltage of the buck unit includes a positive source voltage AVDD and a negative source voltage AVEE.
  • the initial voltage of the gamma voltage obtained by step-down of the buck unit includes: a highest voltage VGMN of a negative gray scale voltage and a highest voltage VGMP of a positive gray scale voltage.
  • the additional voltage signal generated by the boost unit includes a positive additional voltage signal and a negative additional voltage signal. The positive additional voltage signal is used to superimpose on the highest voltage VGMP of the positive gray scale voltage, the negative additional voltage signal being used to superimpose on the highest voltage VGMN of the negative gray scale voltage.
  • the boosting unit obtains the additional voltage signal by dividing the source voltage, or by driving the other circuits in the vicinity of the gamma voltage generating circuit by time division multiplexing. Additional voltage signal.
  • the present disclosure also provides a driving unit including any of the above gamma voltage generating circuits.
  • the present disclosure also provides a display device including the above-described driving unit or, alternatively, any of the above-described gamma voltage generating circuits.
  • the display device may further include: an enhancement function on unit for accepting a white screen monochrome enhancement command, and generating a control signal for turning on the boosting unit according to the white screen monochrome enhancement command.
  • the present disclosure also provides a color coordinate adjustment method, including:
  • the superimposing an additional voltage on the highest order gamma voltage of the monochromatic driving voltage that needs to be enhanced is implemented by: when the white color enhancement of the white screen is required, at the initial voltage of the input voltage dividing unit An additional voltage is superimposed, the voltage dividing unit being located in the gamma voltage generating circuit for dividing the initial voltage of the gamma voltage to generate each order gamma voltage.
  • Embodiments of the present disclosure provide a gamma voltage generating circuit, a driving unit, a display device, and a color coordinate adjusting method, which can generate generated gamma voltages by superimposing an additional voltage signal on an initial voltage of a gamma voltage.
  • the overall enhancement is achieved, achieving the effect of monochromatic brightening.
  • the method of the present disclosure can solve the problem that the color coordinates of the display device are inconsistent caused by the differences in materials and processes between the respective suppliers of the display panel and the backlight module, and the brightness of the white screen is not reduced.
  • FIG. 1 is a schematic structural diagram of a gamma voltage generating circuit
  • 2 is a schematic diagram of driving voltages of white screen pixels
  • FIG. 3 is a schematic structural diagram of a gamma voltage generating circuit provided in an embodiment of the present disclosure
  • FIG. 4 is a schematic diagram of driving voltages of white-picture pixels provided in an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of a specific implementation manner of a boosting unit provided in an embodiment of the present disclosure.
  • FIG. 1 shows a schematic diagram of the architecture of a gamma voltage generating circuit.
  • the gamma voltage generating circuit includes a low dropout regulator (LDO) 21 and a voltage dividing unit 22.
  • the source voltage of the input LDO 21 includes a positive source voltage AVDD and a negative source voltage AVEE, and the initial voltage of the gamma voltage obtained by the source voltage being stepped down by the LDO, including: the highest voltage of the negative gray scale voltage VGMN and the highest of the positive gray scale voltage Voltage VGMP.
  • the voltage dividing unit 22 divides the initial voltage of the gamma voltage to generate respective gamma voltages (GMA1 to GMA255).
  • a low dropout regulator (LDO) is a linear regulator that uses a transistor or FET operating in its linear region to subtract excess voltage from the applied input voltage. Adjusted output voltage.
  • the initial voltage of the gamma voltage (VGMN/VGMP in Fig. 1 represents the initial voltage of the gamma voltage) is the voltage passed through the upper stage circuit, that is, the source voltage (in FIG. 1
  • the AVDD/AVEE represents the source voltage
  • FIG. 2 shows a schematic diagram of driving voltages of white-picture pixels. As shown in FIG. 2, the driving voltage of each pixel in the white screen (ie, Source L255 in FIG. 2) is flipped once per frame voltage.
  • the embodiment of the present disclosure designs a voltage side branch for the source voltage.
  • a part of the voltage is additionally superimposed on the original voltage, and the voltage corresponding to a certain color is enhanced under the gray level of 255.
  • FIG. 3 illustrates a block diagram of a gamma voltage generating circuit provided in one embodiment of the present disclosure.
  • the gamma voltage generating circuit includes a step-down unit 21 (for example, an LDO in FIG. 3) and a voltage dividing unit 22.
  • the buck unit 21 is for stepping down the input source voltage to obtain an initial voltage of the gamma voltage.
  • the voltage dividing unit 22 is for dividing the initial voltage of the gamma voltage to generate respective gamma voltages (GMA1 to GMA255).
  • the gamma voltage generating circuit may further include a boosting unit 23 for generating an additional voltage signal Ven, and an additional voltage signal Ven generated by the boosting unit 23 for superimposing on the initial voltage of the gamma voltage.
  • the additional voltage signal Ven generated by the boosting unit 23 is superimposed on the initial voltage of the gamma voltage corresponding to the primary color.
  • FIG. 4 shows a schematic diagram of driving voltages of white-picture pixels provided in one embodiment of the present disclosure.
  • the initial voltage corresponding to a certain primary color is enhanced on the basis of the original voltage, and the initial voltages corresponding to the remaining primary colors are unchanged.
  • the gamma voltages corresponding to a certain primary color be enhanced as a whole, and the effect of monochromatic brightening can be achieved, and at the same time, the voltages corresponding to other primary colors do not need to be adjusted, and thus the brightness of the white screen does not decrease.
  • the solution of the embodiment of the present disclosure can solve the problem that the color coordinates of the display device are inconsistent caused by the differences in materials and processes between the respective suppliers of the display panel and the backlight module, and the brightness of the white screen is not reduced.
  • the source voltage of the buck unit 21 includes a positive source voltage AVDD and a negative source voltage AVEE.
  • the initial voltage of the gamma voltage obtained by step-down of the buck unit 21 includes: the highest voltage VGMN of the negative gray scale voltage and the highest voltage VGMP of the positive gray scale voltage.
  • the additional voltage signal Ven generated by the boosting unit 23 includes a positive additional voltage signal for superimposing on the highest voltage VGMP of the positive gray scale voltage, and a negative additional voltage signal for superimposing to the negative The highest voltage of the gray scale voltage is on VGMN.
  • FIG. 1 and FIG. 3 only schematically show the architectural diagram of the gamma voltage generating circuit, instead of the specific circuit diagram.
  • Symphony skilled in the art is within the technical scope of the present disclosure, Based on the inventive concept of superimposing an additional voltage on an initial voltage of a gamma voltage to enhance the overall gamma voltage, the various designs of the specific circuit can be made, and these designs should be covered by the protection scope of the present disclosure. Inside.
  • the specific implementation manner of the boosting unit 23 is not limited in the embodiment of the present disclosure, and may be any implementation well known to those skilled in the art.
  • the boosting unit 23 may obtain an additional voltage signal Ven by dividing the source voltage, or may obtain an additional voltage signal Ven by driving in time division multiplexing of other circuits in the vicinity of the gamma voltage generating circuit.
  • This embodiment directly realizes the function of the boosting unit 23 by using a nearby circuit, and does not need to introduce a new module, which simplifies the circuit.
  • FIG. 5 illustrates an alternate embodiment of a boost unit provided in one embodiment of the present disclosure.
  • V1 in FIG. 5 is the input voltage of the boosting unit 23 (which may be a source voltage or another bypass voltage), is selected by the 64-bit selector 231, and its output voltage is set to a voltage value.
  • Small voltage output ie output voltage Vin.
  • This output voltage Vin is input to an additional voltage signal generation module 232 via a diode 233.
  • the other input (or control terminal) of the additional voltage signal generation module 232 inputs a control signal LX.
  • the additional voltage signal generating module 232 has a function of: selecting whether to output the output voltage Vin of the 64-bit selector under the control of the control signal LX (in a specific implementation, the level of the output voltage Vin of the 64-bit selector can be directly The output can also be adjusted after the level of the output voltage Vin of the 64-bit selector is adjusted. For example, when the control signal LX is at a high level, the level of the additional voltage signal Ven output by the additional voltage signal generating module 232 is Vin, and when LX is at a low level, the additional voltage signal Ven output by the additional voltage signal generating module 232 is 0 level.
  • Vin is used to control the amplitude of the outputted additional voltage signal Ven
  • the control signal LX is used to control the frequency of the outputted additional voltage signal Ven.
  • the above-described additional voltage signal generating module 232 may be, for example, an AND gate logic circuit, but is not limited thereto.
  • the solution of the embodiment of the present disclosure is directly improved at the hardware level.
  • an additional voltage signal is superimposed on the initial voltage of the gamma voltage.
  • the maximum voltage VGMN/the highest voltage of the negative grayscale voltage VGMP of the negative grayscale voltage and the highest voltage VGMP of the positive grayscale voltage are white as the white screen.
  • the driving voltage of the screen achieves the effect of adjusting the color shift of the white screen without reducing the overall brightness of the white screen.
  • the current color enhancement technology generally only uses an algorithm to increase the brightness of the intermediate gray scale. If the green color is to be green, the G27 is processed into G30, but the G255 cannot be re-enhanced. Or, if you want to enhance a certain color with a grayscale voltage of 255, you can only reduce the brightness of 255 steps of other colors. Weak to achieve, but the overall brightness of the white screen will be weakened.
  • the improvement is directly at the hardware level, when the monochrome enhancement function is turned on, an additional voltage signal is superimposed on the initial voltage of the gamma voltage, so that not only the gamma voltages corresponding to a certain primary color can be obtained.
  • the overall enhancement, and for the white screen, as shown in FIG. 4, the maximum voltage Ven of the additional voltage signal Ven and the negative gray scale voltage VGMN / the highest voltage VGMP of the positive gray scale voltage is used as the driving voltage of the white screen (Source L255), Thereby, the effect of adjusting the color shift of the white screen without reducing the overall brightness of the white screen is achieved.
  • the embodiment of the present disclosure further provides a driving unit including any of the gamma voltage generating circuits in the above embodiments.
  • the driving unit can realize the color coordinate adjustment, thereby solving the problem that the color coordinates of the display device are inconsistent caused by the differences in materials and processes between the respective suppliers of the display panel and the backlight module, and the brightness of the white screen is not reduced.
  • the driving unit can provide driving signals for any product or component having a display function such as a liquid crystal panel, an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the embodiment of the present disclosure further provides a display device provided with the above-described driving unit, or any of the gamma voltage generating circuits in the above embodiments.
  • the display device can solve the problem that the color coordinates of the display device are inconsistent due to differences in materials and processes between the respective suppliers of the display panel and the backlight module, and thus does not reduce the brightness of the white screen.
  • the display device can be any product or component having a display function, such as a liquid crystal panel, an electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the display device may further include: an enhancement function on unit for accepting a white screen monochrome enhancement command, and generating a control signal for turning on the boosting unit according to the white screen monochrome enhancement command.
  • a physical or virtual button may be formed outside the display device to receive a white-frame monochrome enhancement command.
  • the enhanced function-on unit generates an on-press according to the white-frame monochrome enhancement command. The control signal of the unit.
  • the circuit of the boosting unit is formed with a controllable switch, and the controllable switch can accept the control signal of the boosting unit to turn on the circuit of the boosting unit, and the boosting unit starts to work (or does not have a controllable switch, and the boosting unit)
  • the control signal of the boosting unit is started to start working.
  • the additional voltage signal generated by the boosting unit is superimposed on the initial voltage of the gamma voltage to achieve a monochrome enhancement effect.
  • the white picture monochrome enhancement or the white picture monochrome enhancement instruction mentioned in the foregoing embodiments of the present disclosure is used to emphasize that the solution described in this embodiment can not only achieve a certain monochrome enhancement but also a white picture (corresponding to In the case of the highest order gamma voltage of each color, the monochromatic absolute enhancement can also be achieved, rather than by relatively weakening the voltage of the remaining primary colors other than the monochromatic color.
  • an embodiment of the present disclosure further provides a color coordinate adjustment method including: superimposing an additional voltage on a highest-order gamma voltage of a monochromatic driving voltage that needs to be enhanced when white-frame monochrome enhancement is required.
  • Each pixel is composed of three sub-pixels of R, G, and B.
  • the current driver chip supports the R/G/B gray scale voltage to be uniformly controlled, but some driver chips support the R/G/B gray scale voltage separately.
  • the highest-order gamma voltage (ie, GMA255) of the monochromatic driving voltage to be enhanced can be improved on the original basis, a certain monochrome color can be increased without lowering the brightness of the white screen. Bright, to achieve the purpose of adjusting the color coordinates of the white screen.
  • the above-mentioned superimposing an additional voltage on the highest-order gamma voltage of the monochromatic driving voltage to be enhanced may be implemented by superimposing the initial voltage of the input voltage dividing unit when a white-frame monochrome enhancement is required.
  • An additional voltage, the voltage dividing unit is located in the gamma voltage generating circuit for dividing the initial voltage of the gamma voltage to generate each order gamma voltage.
  • the color coordinate adjustment method provided by the embodiment of the present disclosure increases the initial voltage corresponding to the primary color on the basis of the original voltage, and the initial voltage corresponding to the remaining primary colors does not change. In this way, not only the color shift of the white screen can be adjusted without lowering the brightness of the white screen, but also the gamma voltages of the respective levels corresponding to a certain primary color can be enhanced as a whole to achieve a monochromatic overall brightening effect, and the display panel and the backlight are solved.
  • the problem of inconsistent color coordinates of the display device caused by the differences in materials and processes between the various suppliers of the module.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

一种伽马电压生成电路、驱动单元、显示装置和色坐标调节方法，该伽马电压生成电路包括：降压单元(21)，用于将输入的源电压(AVDD/AVEE)降压以得到伽马电压的初始电压(VGMN/VGMP)；分压单元(22)，用于将所述伽马电压的初始电压(VGMN/VGMP)分压以生成各阶伽马电压(GMA1～GMA255)；增压单元(23)，用于产生附加电压信号(Ven)，所产生的附加电压信号(Ven)用以叠加到所述伽马电压的初始电压(VGMN/VGMP)上。该伽马电压生成电路能够调节色坐标达到使显示装置显示效果一致，并且不会因此降低白画面的亮度，从而解决由于显示面板和背光模组的各个供应商在材料、工艺上的差异所导致的显示装置显示效果不一致的问题。

Description

伽马电压生成电路、驱动单元、显示装置和色坐标调节方法 技术领域
本公开涉及一种伽马电压生成电路、驱动单元、显示装置和色坐标调节方法。
背景技术
液晶显示器由于具有零辐射、低功耗、散热小、体积小、图像还原精确、字符显示锐利等优点，目前已成为显示领域的主流产品。
液晶显示器主要是由显示面板(panel)、背光模组和驱动芯片(driver IC)组成。在同一个显示产品的项目中，可能同时存在多个背光模组的供应商。而不同的背光模组生产厂家或者显示面板生产时在工艺及技术等方面存在差异，会导致纯白画面中的单基色如红绿蓝(RGB)不一致，结果使得即便使用相同型号的显示面板，如果搭配不同厂家的背光模组，也会出现显示画面偏红或者偏黄等现象。
为了调和不同供应商之间的差异带来的不足，就需要改善背光模组或者显示面板。但是这两者改动起来动作大，而且耗时较长。所以目前多采用通过驱动芯片将RGB的255灰阶电压调到不一样的方法。即，如果某一生产厂家的背光模组搭配某一显示面板需要白画面偏红才能使最终显示效果与预设标准一致。这样就需要将白画面中另外两色(绿色和蓝色)的电压减弱，从而使红色相对突出。虽然这样达到了驱动时使某单一色彩突出而整体显示效果一致的目的，但同时也降低了白画面的亮度(白画面是由R255、G255和B255合成的，其中任何一个降低，白画面亮度就会降低)。
发明内容
在本公开的实施例中提供一种伽马电压生成电路、驱动单元、显示装置和色坐标调节方法，能够调节色坐标达到使显示装置显示效果一致，并且不会因此降低白画面的亮度，从而解决由于显示面板和背光模组的各个供应商在材料、工艺上的差异所导致的显示装置显示效果不一致的问题。
本例如，公开的实施例可以采用如下技术方案来实现：
一种伽马电压生成电路，包括：降压单元、分压单元和增压单元；所述降压单元用于将输入的源电压降压以得到伽马电压的初始电压；所述分压单元用于将所述伽马电压的初始电压分压以生成各阶伽马电压；所述增压单元用于产生附加电压信号，所述增压单元产生的附加电压信号用以叠加到所述伽马电压的初始电压上。
按照本公开的一个方面，提供一种伽马电压生成电路，包括：
降压单元，用于将输入的源电压降压以得到伽马电压的初始电压；
分压单元，用于将所述伽马电压的初始电压分压以生成各阶伽马电压；
增压单元，用于产生附加电压信号，所产生的附加电压信号用以叠加到所述伽马电压的初始电压上。
可选地，所述降压单元的源电压包括正的源电压AVDD和负的源电压AVEE。所述降压单元降压得到的所述伽马电压的初始电压包括：负灰阶电压的最高电压VGMN和正灰阶电压的最高电压VGMP。所述增压单元产生的附加电压信号包括正的附加电压信号和负的附加电压信。所述正的附加电压信号用以叠加到正灰阶电压的最高电压VGMP上，所述负的附加电压信号用以叠加到负灰阶电压的最高电压VGMN上。
可选地，所述增压单元通过将所述源电压进行分压得到所述附加电压信号，或者，通过对所述伽马电压生成电路附近的其他电路采用时分复用方式驱动而得到所述附加电压信号。
本公开还提供一种驱动单元，包括上述任一伽马电压生成电路。
本公开还提供一种显示装置，包括上述驱动单元，或者，包括上述任一伽马电压生成电路。
该显示装置还可以包括：增强功能开启单元，用于接受白画面单色增强指令，并根据所述白画面单色增强指令生成开启所述增压单元的控制信号。
另一方面，本公开还提供一种色坐标调节方法，包括：
当需要白画面单色增强时，在需要增强的单色驱动电压的最高阶伽马电压上叠加一个附加电压。
可选地，所述在需要增强的单色驱动电压的最高阶伽马电压上叠加一个附加电压，具体通过如下方式实现：当需要白画面单色增强时，在输入分压单元的初始电压上叠加一个附加电压，所述分压单元位于伽马电压生成电路中，用于将所述伽马电压的初始电压分压以生成各阶伽马电压。
本公开的实施例提供一种伽马电压生成电路、驱动单元、显示装置和色坐标调节方法，通过在伽马电压的初始电压上叠加一个附加电压信号，从而能使生成的各阶伽马电压整体均增强，达到单色增亮的效果。采用本公开方案能够解决显示面板和背光模组的各个供应商在材料、工艺上的差异所导致的显示装置色坐标不一致的问题，并且不会因此降低白画面的亮度。
附图说明
图1为一种伽马电压生成电路的架构示意图；
图2为白画面像素的驱动电压示意图；
图3为本公开的一个实施例中提供的伽马电压生成电路的架构示意图；
图4为本公开的一个实施例中提供的白画面像素的驱动电压示意图；
图5为本公开的一个实施例中提供的增压单元的一种具体实现方式示意图。
具体实施方式
下面将结合附图，对本公开实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本公开保护的范围。
图1示出一种伽马电压生成电路的架构示意图。
如图1所示，该伽马电压生成电路包括：低压差线性稳压器(low dropout regulator，LDO)21和分压单元22。输入LDO 21的源电压包括正的源电压AVDD和负的源电压AVEE，源电压经LDO降压得到的伽马电压的初始电压，包括：负灰阶电压的最高电压VGMN和正灰阶电压的最高电压VGMP。然后，分压单元22将伽马电压的初始电压分压以生成各阶伽马电压(GMA1～GMA255)。这里，低压差线性稳压器(low dropout regulator，LDO)是一种线性稳压器，使用在其线性区域内运行的晶体管或场效应管，从施加的输入电压中减去超额的电压，产生经过调节的输出电压。
按上述伽马电压生成电路的架构，伽马电压的初始电压(图1中的VGMN/VGMP即代表伽马电压的初始电压)是通过上一级电路的电压，即，源电压(图1中的AVDD/AVEE即代表源电压)降压而来。
图2示出白画面像素的驱动电压示意图。如图2所示，每个像素在白画面时驱动电压(即图2中的Source L255)每一帧电压翻转一次。
为了既能做到某一单色对应的电压在原有的电压上增强，达到单色增强的预期效果，又不引起亮度降低，本公开的实施例为源电压设计了一个电压旁支。通过同步时分复用，在原有的电压基础上额外叠加部分电压，达到某一色彩对应的电压在255的灰阶下加强的效果。这样只需要通过软件(如代码code调试方法)就能综合各个供应商在材料和工艺上的差异。
图3示出本公开的一个实施例中提供一种伽马电压生成电路的架构示意图。参照图3所示，该伽马电压生成电路包括：降压单元21(例如图3中LDO)和分压单元22。降压单元21用于将输入的源电压降压以得到伽马电压的初始电压。分压单元22用于将伽马电压的初始电压分压以生成各阶伽马电压(GMA1～GMA255)。该伽马电压生成电路还可以包括：增压单元23，用于产生附加电压信号Ven，并且，增压单元23产生的附加电压信号Ven用以叠加到伽马电压的初始电压上。
如果要实现单基色(一般为红绿蓝三基色之一)增强的效果，需将增压单元23产生的附加电压信号Ven叠加到该基色对应的伽马电压的初始电压上。
图4示出本公开的一个实施例中提供的白画面像素的驱动电压示意图。如图4所示，使某一基色对应的初始电压在原有电压基础上增强，其余基色对应的初始电压不变。这样不仅能使某一基色对应的各阶伽马电压整体均增强，达到单色增亮的效果，而且同时其他基色对应的电压不需要调整，因而白画面的亮度也不会降低。采用本公开实施例的方案能够解决显示面板和背光模组的各个供应商在材料、工艺上的差异所导致的显示装置色坐标不一致的问题，并且不会因此降低白画面的亮度。
可选地，降压单元21的源电压包括正的源电压AVDD和负的源电压AVEE。降压单元21降压得到的伽马电压的初始电压包括：负灰阶电压的最高电压VGMN和正灰阶电压的最高电压VGMP。如图4所示，增压单元23产生的附加电压信号Ven包括正的附加电压信号，用以叠加到正灰阶电压的最高电压VGMP上，还包括负的附加电压信号，用以叠加到负灰阶电压的最高电压VGMN上。
需要说明的是，图1、图3仅示意性地示出伽马电压生成电路的架构图，而不是具体电路图。任何熟悉本技术领域的技术人员在本公开揭露的技术范围内， 基于本公开提供的在伽马电压的初始电压上叠加附加电压使各阶伽马电压整体增强的发明构思，可以对具体电路做出多种设计，这些设计都应涵盖在本公开的保护范围之内。
而且，本公开实施例对增压单元23的具体实现方式也不做限定，可以是本领域技术人员所熟知的任意实现方式。例如，增压单元23可通过将源电压进行分压得到附加电压信号Ven，或者，通过对伽马电压生成电路附近的其他电路采用时分复用方式驱动而得到附加电压信号Ven。该种实施方式直接利用附近的电路实现增压单元23的功能，不需要引入新的模块，可简化电路。
图5示出本公开的一个实施例中提供的增压单元的一种可选的实施方式。如图5所示，图5中的V1即增压单元23的输入电压(可以是源电压或者别的旁路电压)，通过64位选择器231选择，将其输出电压设置成一个电压值较小的电压输出(即输出电压Vin)。这个输出电压Vin通过一个二极管233输入一个附加电压信号生成模块232。附加电压信号生成模块232的另一输入端(或控制端)输入控制信号LX。附加电压信号生成模块232具有这样的功能：在控制信号LX的控制下，选择是否将64位选择器的输出电压Vin输出(具体实施时可以是将64位选择器的输出电压Vin的电平直接输出，也可以对64位选择器的输出电压Vin的电平调整后再输出)。例如可选地，控制信号LX为高电平时，附加电压信号生成模块232输出的附加电压信号Ven的电平为Vin，LX为低电平时，附加电压信号生成模块232输出的附加电压信号Ven为0电平。即，Vin用以控制输出的附加电压信号Ven的幅值，控制信号LX用以控制输出的附加电压信号Ven的频率。上述的附加电压信号生成模块232例如可以是与门逻辑电路，但并不限于此。
综上所述，本公开实施例的方案直接在硬件层面进行改进。开启单色增强功能时，在伽马电压的初始电压上叠加附加电压信号。这样，不仅能使某一基色对应的各阶伽马电压整体均增强，而且对白画面而言，附加电压信号Ven和负灰阶电压的最高电压VGMN/正灰阶电压的最高电压VGMP共同作为白画面的驱动电压，达到调节白画面色偏但不会降低白画面整体亮度的效果。
针对要解决的某些色偏问题，现在已存在一些色彩增强(Color Enhancement)技术。但是目前的色彩增强技术一般只能运用算法将中间灰阶亮度增加，如若要偏绿，将G27处理成G30，但是无法将G255进行再增强处理。或者，若要将灰阶电压为255的某色增强，只能通过将别的色彩255阶的亮度减 弱来实现，但是这样白画面整体亮度会减弱。而采用本公开实施例的方案，由于直接在硬件层面进行改进，开启单色增强功能时，在伽马电压的初始电压上叠加附加电压信号，不仅能使某一基色对应的各阶伽马电压整体均增强，而且对白画面而言，如图4所示，附加电压信号Ven和负灰阶电压的最高电压VGMN/正灰阶电压的最高电压VGMP共同作为白画面的驱动电压(Source L255)，从而达到调节白画面色偏但不会降低白画面整体亮度的效果。
本公开实施例还提供一种驱动单元，包括上述实施例中的任一伽马电压生成电路。该驱动单元可以实现色坐标调整，从而解决显示面板和背光模组的各个供应商在材料、工艺上的差异所导致的显示装置色坐标不一致的问题，并且不会因此降低白画面的亮度。该驱动单元可以为液晶面板、电子纸、OLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件提供驱动信号。
本公开实施例还提供一种显示装置，设置有上述的驱动单元，或者，上述实施例中的任一伽马电压生成电路。该显示装置能够解决显示面板和背光模组的各个供应商在材料、工艺上的差异所导致的显示装置色坐标不一致的问题，并且不会因此降低白画面的亮度。该显示装置可以为：液晶面板、电子纸、OLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
进一步地，该显示装置还可以包括：增强功能开启单元，用于接受白画面单色增强指令，并根据白画面单色增强指令产生开启所述增压单元的控制信号。可以在显示装置外部形成实体或虚拟按键来接收白画面单色增强指令，在显示装置内部(一般为设置驱动单元的芯片上)，该增强功能开启单元根据白画面单色增强指令产生开启增压单元的控制信号。增压单元所在电路形成有可控开关，可控开关可以接受开启增压单元的控制信号从而使增压单元所在电路导通，增压单元开始工作(或者不设可控开关，由增压单元本身接受开启增压单元的控制信号从而开始工作)，增压单元产生的附加电压信号叠加到伽马电压的初始电压上，实现单色增强效果。
需要说明的是，上述本公开各实施例中提到白画面单色增强或白画面单色增强指令用于强调本实施例所述方案不仅能实现某一单色增强，而且在白画面(对应各单色的最高阶伽马电压)时，也能使该单色绝对增强，而不是通过将该单色之外的其余基色的电压减弱从而使该单色相对增强的方式。
另一方面，本公开实施例还提供一种色坐标调节方法，包括：当需要白画面单色增强时，在需要增强的单色驱动电压的最高阶伽马电压上叠加一个附加电压。
每个像素是由R、G、B三个子像素构成。一般而言，目前的驱动芯片是支持R/G/B灰阶电压是统一控制的，但也有一些驱动芯片是支持R/G/B灰阶电压分开控制的。但是，无论哪一种情况，只要能把需要增强的单色驱动电压的最高阶伽马电压(即GMA255)在原有基础上提高，可在不降低白画面亮度的情况下把某个单色增亮，达到调节白画面色坐标的目的。
可选地，上述在需要增强的单色驱动电压的最高阶伽马电压上叠加一个附加电压，可以通过如下方式实现：当需要白画面单色增强时，在输入分压单元的初始电压上叠加一个附加电压，所述分压单元位于伽马电压生成电路中，用于将伽马电压的初始电压分压以生成各阶伽马电压。
本公开实施例提供的色坐标调节方法，使该基色对应的初始电压在原有电压基础上增强，其余基色对应的初始电压不变。这样不仅能调整白画面的色偏而不降低白画面的亮度，也可以使某一基色对应的各阶伽马电压整体均增强，达到某一单色整体增亮的效果，解决显示面板和背光模组的各个供应商在材料、工艺上的差异所导致的显示装置色坐标不一致的问题。
本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。尤其，对于方法实施例而言，由于其基本相似于方法实施例，所以描述得比较简单，相关之处参见方法实施例的部分说明即可。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。
本申请要求于2015年4月17日递交的中国专利申请第201510184943.9 号的优先权，在此全文引用该中国专利申请公开的内容作为本申请的一部分。

Claims (10)

  1. 一种伽马电压生成电路，包括：
    降压单元，用于将输入的源电压降压以得到伽马电压的初始电压；
    分压单元，用于将所述伽马电压的初始电压分压以生成各阶伽马电压；
    增压单元，用于产生附加电压信号，所产生的附加电压信号用以叠加到所述伽马电压的初始电压上。
  2. 根据权利要求1所述的伽马电压生成电路，其中，
    所述降压单元的源电压包括正的源电压AVDD和负的源电压AVEE，所述降压单元降压得到的所述伽马电压的初始电压包括：负灰阶电压的最高电压VGMN和正灰阶电压的最高电压VGMP。
  3. 根据权利要求2所述的伽马电压生成电路，其中，
    所述增压单元产生的附加电压信号包括正的附加电压信号和负的附加电压信，所述正的附加电压信号用以叠加到正灰阶电压的最高电压VGMP上，所述负的附加电压信号，用以叠加到负灰阶电压的最高电压VGMN上。
  4. 根据权利要求1-3之一所述的伽马电压生成电路，其中，
    所述增压单元通过将所述源电压进行分压得到所述附加电压信号。
  5. 根据权利要求1-3之一所述的伽马电压生成电路，其中，通过对所述伽马电压生成电路附近的其他电路采用时分复用方式驱动而得到所述附加电压信号。
  6. 一种驱动单元，其中，包括权利要求1-5任一项所述的伽马电压生成电路。
  7. 一种显示装置，其中，包括权利要求6所述的驱动单元。
  8. 根据权利要求7所述的显示装置，其中，还包括：
    增强功能开启单元，用于接受白画面单色增强指令，并根据所述白画面单色增强指令生成开启所述增压单元的控制信号。
  9. 一种色坐标调节方法，包括：
    当需要白画面单色增强时，在需要增强的单色驱动电压的最高阶伽马电压上叠加一个附加电压。
  10. 根据权利要求9所述的色坐标调节方法，其中，所述在需要增强的单色驱动电压的最高阶伽马电压上叠加一个附加电压包括：
    当需要白画面单色增强时，在输入分压单元的初始电压上叠加一个附加电压，所述分压单元位于伽马电压生成电路中，用于将所述伽马电压的初始电压分压以生成各阶伽马电压。
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