WO2020024433A1 - 显示控制电路、方法及平面显示装置 - Google Patents

显示控制电路、方法及平面显示装置 Download PDF

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Publication number
WO2020024433A1
WO2020024433A1 PCT/CN2018/110548 CN2018110548W WO2020024433A1 WO 2020024433 A1 WO2020024433 A1 WO 2020024433A1 CN 2018110548 W CN2018110548 W CN 2018110548W WO 2020024433 A1 WO2020024433 A1 WO 2020024433A1
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Prior art keywords
reference voltage
capacitor
voltage
terminal
gamma
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English (en)
French (fr)
Inventor
张先明
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US16/311,679 priority Critical patent/US10796634B2/en
Publication of WO2020024433A1 publication Critical patent/WO2020024433A1/zh
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

Definitions

  • the present invention relates to the field of display technology, and in particular, to a display control circuit, method and flat display device.
  • the driving system of the existing flat display device usually includes a programmable gamma circuit (P-Gamma IC). Using the input reference voltage Vref, the programmable gamma circuit generates a gamma voltage. The gamma voltage can be provided to the data driving circuit to perform gamma correction on the pixel grayscale reference voltage generated by the data driving circuit to obtain pixels. Gray-scale voltage.
  • P-Gamma IC programmable gamma circuit
  • the reference voltage Vref is used as a reference voltage for the gamma voltages of all regions of the display panel, such as the far end, the middle region, and the near end.
  • a programmable gamma circuit P-Gamma IC
  • all the gammas Horse voltage is generated by this voltage in a manner similar to voltage division (ADC (analog-to-digital conversion), then DAC (digital-to-analog conversion) output).
  • Another object of the present invention is to provide a display control method for adjusting the gamma voltages of the display panel at different far and near ends in the same frame.
  • the first terminal of a capacitor is used to input the charging voltage
  • the positive input terminal of the subtractor is connected to the output terminal of the initial reference voltage generating module, and the output terminal of the subtractor outputs the adjusted reference voltage required by different areas of the display panel;
  • the initial reference An output terminal of the voltage generating module (10) outputs a fixed initial reference voltage;
  • the adjusted reference voltage is used to generate a gamma voltage.
  • the change curve of the charging voltage within one frame time of the display panel is obtained by fitting the change trend of the reference voltage after adjusting the three positions of the display panel's far end, middle area and near end. The three positions need to be adjusted.
  • the rear reference voltage is converted from the gamma voltage required for the three positions.
  • the current source and the first capacitor are preset according to the change curve.
  • the initial reference voltage generating module includes a controllable precision voltage stabilizing source; a first resistor is connected between a reference terminal of the controllable precision voltage stabilizing source and a cathode, and a second resistor and a first resistor are connected in series between the reference terminal and the anode.
  • the cathode is connected to the input voltage via the fourth resistor, the cathode outputs the initial reference voltage via the fifth resistor, and the anode is grounded.
  • the invention also provides a flat display device, comprising the display control circuit according to any one of the above.
  • the flat display device is a TFT-LCD flat display device or an OLED flat display device.
  • the present invention also provides a display control method, including the following steps:
  • the current source is connected to the first terminal of the first capacitor to generate a charging voltage that changes with time, and the second terminal of the first capacitor is grounded;
  • the discharge circuit is connected to the first end of the first capacitor to clear the charging voltage at the beginning of each frame of the display panel;
  • the negative input terminal of the subtractor is connected to the first terminal of the first capacitor to input the charging voltage
  • the positive input terminal of the subtractor is connected to the output terminal of the initial reference voltage generating module
  • the output terminal of the subtractor outputs different areas required by the display panel. Adjusted reference voltage
  • the output terminal of the initial reference voltage generating module outputs a fixed initial reference voltage
  • the change curve of the charging voltage within one frame time of the display panel is obtained by fitting in advance the change trend of the reference voltage after adjusting the three positions of the display panel's far end, middle area and near end.
  • the reference voltage after adjustment is converted from the gamma voltage required for the three positions.
  • the display control circuit, method and flat display device of the present invention realize the adjustment of the gamma voltages of the display panel in the same frame, and different gamma voltages at the far and near ends, thereby improving the display characteristics of the entire display panel without Brings other risks.
  • FIG. 1 is a schematic circuit diagram of a control circuit according to a preferred embodiment of the present invention.
  • FIG. 2 is a schematic diagram showing the relationship between the charging voltage V1 and the control signal STV of a control circuit according to a preferred embodiment of the present invention.
  • FIG. 1 is a schematic circuit diagram of a display control circuit according to a preferred embodiment of the present invention.
  • the display control circuit of the present invention mainly includes a direct current source DC, a first capacitor C1, a discharge circuit, a subtractor OP, and an initial reference voltage generating module 10.
  • the initial reference voltage generation module 10 mainly includes a controllable precision voltage stabilization source IC1, which uses a chip TL431; a reference resistor R1 between the reference terminal R and the cathode C of the controllable precision voltage stabilization source TL431.
  • a second resistor R2 + a third resistor R3 is connected between the terminal R and the anode A, the cathode C is connected to the input voltage VAA via a fourth resistor R4, the cathode C outputs an initial reference voltage Vref via a fifth resistor R5, and the anode A is grounded; in this embodiment
  • the specific Vref can be controlled to 16.47V.
  • the input voltage VAA can be 16.8V, and the resistor R4 is used to limit the current.
  • the current flowing through R4 can be controlled to 9.9mA.
  • One end of the second capacitor C2 is connected to the input voltage VAA, and the other end is grounded; one end of the third capacitor C3 is connected to the cathode C of the controllable precision voltage stabilization source IC1, and the other end is grounded; the second capacitor C2 and the third capacitor C3 can respectively input the voltage VAA. It is filtered with the initial reference voltage Vref.
  • the output terminal of the initial reference voltage generating module 10 outputs a fixed initial reference voltage Vref.
  • the initial reference voltage Vref is mainly generated by the input voltage VAA through the voltage division of the controllable precision voltage regulator.
  • the initial reference voltage Vref can be achieved by setting specific parameters of each element in the initial reference voltage generating module 10.
  • the discharge circuit is an enhanced NMOS tube Q1.
  • the source is grounded, the drain is connected to the first end of the first capacitor C1, and the gate is connected to the control signal STV.
  • the control signal STV is used in each frame of the display panel. Turn on the NMOS tube Q1 at the beginning, clear the charging voltage V1 on the first capacitor C1, and then turn off the NMOS tube Q1. For example, you can make the control signal STV high at the beginning of each frame and clear the charging voltage V1. Turn to low level, and control whether the charging voltage V1 is cleared by controlling the opening and closing of the NMOS tube Q1.
  • the direct current source DC is connected to the first terminal of the first capacitor C1 to generate a charging voltage V1 that changes with time, and the second terminal of the first capacitor C1 is grounded; the first terminal of the first capacitor C1 is connected to the negative input terminal of the subtractor OP to Input the charging voltage V1, the positive input terminal of the subtractor OP inputs the initial reference voltage Vref, and the output terminal of the subtractor OP outputs the adjusted reference voltage Vref_Gamma.
  • the adjusted reference voltage Vref_Gamma can be input to a programmable gamma circuit (not shown) for use.
  • the programmable gamma circuit further generates a corresponding adjusted gamma voltage.
  • the gamma voltage obtained after the reference voltage Vref_Gamma is input to the programmable gamma circuit also gradually decreases, that is, the gamma voltage supplied to the display panel by the programmable gamma circuit also gradually decreases. Because the charging voltage V1 is cleared at the beginning of each frame of the display panel, the adjusted reference voltage Vref_Gamma output by the display control circuit of the present invention at this time is the largest and equal to the initial reference voltage Vref. Accordingly, a programmable gamma circuit is provided for display. The gamma voltage of the panel data driving circuit is also the largest.
  • the data driving circuit correspondingly drives the far end of the display panel; and the charging voltage V1 reaches the maximum at the end of each frame of the display panel.
  • the adjusted reference output by the display control circuit of the present invention The voltage Vref_Gamma is the smallest.
  • the gamma voltage supplied by the programmable gamma circuit to the data driving circuit of the display panel is also the smallest.
  • the data driving circuit correspondingly drives the near end of the display panel; that is, the display panel
  • the gamma voltage supplied to the display panel from the far end to the near end gradually becomes smaller, so that the problems that the existing display panel is bright at the near end and dark at the far end can be solved.
  • the specific value of the fixed initial reference voltage Vref output by the initial reference voltage generating module 10 can be determined according to the required gamma voltage at the far end of the display panel. This is because the same gamma voltage is supplied to the display panel. In the case, the display panel is brighter at the near end and darker at the far end.
  • the adjusted reference voltage Vref_Gamma required at the far end is relatively The near end is larger; in this embodiment, the adjusted reference voltage Vref_Gamma required at the far end of the display panel is set to be equal to the fixed initial reference voltage Vref output by the initial reference voltage generation module 10, and other areas of the display panel (such as the middle area) , Near end)
  • the adjusted reference voltage Vref_Gamma required is obtained by subtracting the gradually increasing charging voltage V1 from the fixed initial reference voltage Vref.
  • the change curve of the charging voltage V1 within one frame time of the display panel can be pre-fitted according to the change trend of the reference voltage that needs to be adjusted in different regions of the display panel.
  • the reference voltage that needs to be adjusted in different regions can be adjusted from the remote end to the display panel.
  • the required gamma voltages for different regions in the near end are pre-converted.
  • the change curve of the charging voltage V1 within one frame time of the display panel can be obtained by fitting in advance the change trend of the reference voltage after adjusting the three positions of the display panel's far end, middle area, and near end, that is, selecting in advance
  • the data of the three positions are fitted, and the adjusted reference voltages required by the three positions can be converted in advance according to the gamma voltages required by the three positions.
  • the present invention also provides a corresponding flat display device, including the above display control circuit.
  • the flat display device of the present invention may be a TFT-LCD flat display device or an OLED flat display device.
  • the present invention also provides a corresponding display control method, which can be implemented based on the display control circuit and the flat display device, and mainly includes the following steps:
  • the current source DC is connected to the first terminal of the first capacitor C1 to generate a charging voltage V1 that changes with time, and the second terminal of the first capacitor C1 is grounded;
  • the discharge circuit is connected to the first end of the first capacitor C1 to clear the charging voltage V1 at the beginning of each frame of the display panel;
  • the negative input terminal of the subtractor OP is connected to the first terminal of the first capacitor C1 to input the charging voltage V1, the positive input terminal of the subtractor is connected to the output terminal of the initial reference voltage generation module 10, and the output terminal of the subtractor outputs a different display panel
  • the adjusted reference voltage Vref_Gamma required for the region
  • the output terminal of the initial reference voltage generating module 10 outputs a fixed initial reference voltage Vref;
  • the reference voltage generating module 10 is used to generate a fixed initial reference voltage Vref.
  • the initial reference voltage Vref can be converted according to the maximum gamma voltage required at the far end of the display panel.
  • the first capacitor C1 is charged by a direct current source DC to form a variable voltage.
  • the charging voltage V1 is cleared by the control signal STV every time the display panel is turned on; the initial reference voltage Vref is subtracted from the charging voltage V1 to obtain the adjusted reference voltage Vref_Gamma required in different regions;
  • the reference voltage Vref_Gamma is used as the reference voltage input to the reference voltage input terminal of the programmable gamma circuit, that is, different gamma voltage adjustments at the far and near ends of the gamma voltage in the same frame can be achieved.
  • the charging voltage V1 changes according to a time-varying curve within one frame time of the display panel.
  • This curve can be obtained by fitting according to the change trend of the reference voltage required for different regions in advance.
  • the adjusted reference voltage for different regions is It is converted according to the required gamma voltage of the display panel from different regions from the far end to the near end; by selecting a suitable current source DC and the first capacitor C1, the change of the charging voltage V1 can be made to conform to the curve obtained in advance.
  • the display control circuit, method and flat display device of the present invention realize the adjustment of the gamma voltages of the display panel in the same frame, and different gamma voltages at the far and near ends, thereby improving the display characteristics of the entire display panel without Brings other risks.

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Abstract

公开了一种显示控制电路、方法及平面显示装置。该显示控制电路包括：电流源(DC)、电容(C1)、放电电路、减法器(OP)以及初始基准电压产生模块(10)；该电流源(DC)连接第一电容(C1)的第一端以产生一随时间变化的充电电压，该第一电容(C1)的第二端接地；该放电电路连接第一电容(C1)的第一端，以在显示面板每一帧开始时清零充电电压；该减法器(OP)的负输入端连接第一电容(C1)的第一端，减法器(OP)的正输入端连接初始基准电压产生模块(10)的输出端，减法器(OP)的输出端输出调整后基准电压(Vref_Gamma)；该初始基准电压产生模块(10)的输出端输出固定的初始基准电压(Vref)；调整后基准电压(Vref_Gamma)用于产生伽马电压。该控制电路实现了对于显示面板伽马电压在同一帧，远近端不同的伽马电压调整，实现了对整个显示面板显示特性的改善。

Description

显示控制电路、方法及平面显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种显示控制电路、方法及平面显示装置。
背景技术
平面显示装置由于机身薄，耗电量小等优点，被广泛应用，现有的平面显示装置一般包括液晶显示器、及有机发光二极管显示器。随着科技的发展及人们物质生活的需求，现今平面显示装置的尺寸做得越来越大。
对于目前的平面显示装置来讲，尺寸越来越大，其显示面板的电阻电容延迟(RC Delay)等也越来越大，很容易就会造成在近COF(覆晶薄膜)侧以及远覆晶薄膜侧充电的电压不相等，导致显示面板在近端(接近覆晶薄膜一侧)偏亮，远端(远离覆晶薄膜一侧)偏暗，造成较大的显示差异，影响显示效果。
现有的平面显示装置的驱动系统通常包括可编程伽马电路(P-Gamma IC)。利用输入的基准电压Vref，可编程伽马电路产生伽马(Gamma)电压，伽马电压可提供给数据驱动电路，以对数据驱动电路产生的像素灰阶参考电压进行伽马校正，从而获得像素灰阶电压。
现有技术中，基准电压Vref作为显示面板远端、中部区域、近端等所有区域的伽马(Gamma)电压的基准电压，输入可编程伽马电路(P-Gamma IC)后，所有的伽马电压都由此电压以类似于分压的方式产生(先ADC(模数转换)，而后DAC(数模转换)输出)。在基准电压Vref不变的情况下，如果要通过调整伽马电压来改善近覆晶薄膜侧以及远覆晶薄膜侧充电的电压不相等的问题，只能采用调整伽马代码(Gamma Code)的方法，那么这种方法在平面显示装置的一帧时间内很难实现。
发明内容
因此，本发明的目的在于提供一种显示控制电路，对于显示面板伽马电压在同一帧作远近端不同的伽马电压调整。
本发明的另一目的在于提供一种平面显示装置，对于显示面板伽马电压在同一帧作远近端不同的伽马电压调整。
本发明的再一目的在于提供一种显示控制方法，对于显示面板伽马电 压在同一帧作远近端不同的伽马电压调整。
为实现上述目的，本发明提供了一种显示控制电路，包括：电流源、电容、放电电路、减法器以及初始基准电压产生模块；该电流源连接第一电容的第一端以产生一随时间变化的充电电压，该第一电容的第二端接地；该放电电路连接第一电容的第一端，以在显示面板每一帧开始时清零充电电压；该减法器的负输入端连接第一电容的第一端以输入该充电电压，减法器的正输入端连接初始基准电压产生模块的输出端，减法器的输出端输出显示面板的不同区域所需的调整后基准电压；该初始基准电压产生模块(10)的输出端输出固定的初始基准电压；所述调整后基准电压用于产生伽马电压。
其中，该放电电路为一NMOS管，其源极接地，漏极连接第一电容的第一端，栅极连接控制信号；该控制信号在显示面板每一帧开始时打开该NMOS管，清零充电电压后关闭该NMOS管。
其中，所述显示控制电路设置于可编程伽马电路的外部，该调整后基准电压输入该可编程伽马电路的基准电压输入端。
其中，该充电电压在显示面板一帧时间内的变化曲线根据显示面板远端、中部区域及近端三个位置所需调整后基准电压的变化趋势拟合得出，该三个位置所需调整后基准电压是根据该三个位置所需伽马电压换算得出。
其中，该电流源及第一电容根据该变化曲线预先设定。
其中，所述初始基准电压产生模块包括可控精密稳压源；所述可控精密稳压源的参考端和阴极之间连接第一电阻，参考端和阳极之间串联连接第二电阻和第三电阻，阴极经由第四电阻连接输入电压，阴极经由第五电阻输出初始基准电压，阳极接地。
本发明还提供了一种平面显示装置，包括上述任一所述的显示控制电路。
其中，所述平面显示装置为TFT-LCD平面显示装置或OLED平面显示装置。
本发明还提供了一种显示控制方法，包括如下步骤：
电流源连接第一电容的第一端以产生一随时间变化的充电电压，第一电容的第二端接地；
放电电路连接第一电容的第一端，以在显示面板每一帧开始时清零充电电压；
减法器的负输入端连接第一电容的第一端以输入该充电电压，减法器的正输入端连接初始基准电压产生模块的输出端，减法器的输出端输出显 示面板的不同区域所需的调整后基准电压；
初始基准电压产生模块的输出端输出固定的初始基准电压；
该调整后基准电压用于产生伽马电压。
其中，该充电电压在显示面板一帧时间内的变化曲线预先根据显示面板远端、中部区域、及近端三个位置所需调整后基准电压的变化趋势拟合得出，该三个位置所需调整后基准电压是根据该三个位置所需伽马电压换算得出。
综上，本发明的显示控制电路、方法及平面显示装置实现了对于显示面板伽马电压在同一帧，远近端不同的伽马电压调整，实现了对整个显示面板显示特性的改善，且不会带来其他风险。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其他有益效果显而易见。
附图中，
图1为本发明显示控制电路一较佳实施例的电路示意图；
图2为本发明显示控制电路一较佳实施例的充电电压V1与控制信号STV之间的关系示意图。
具体实施方式
参见图1，其为本发明显示控制电路一较佳实施例的电路示意图。本发明的显示控制电路主要包括直流电流源DC、第一电容C1、放电电路、减法器OP以及初始基准电压产生模块10。初始基准电压产生模块10主要包括可控精密稳压源IC1，该可控精密稳压源选用芯片TL431；可控精密稳压源TL431的参考端R和阴极C之间连接第一电阻R1，参考端R和阳极A之间连接第二电阻R2+第三电阻R3，阴极C经由第四电阻R4连接输入电压VAA，阴极C经由第五电阻R5输出初始基准电压Vref，阳极A接地；在此实施例中，R5阻值具体可以为0，Vref＝2.5×[1+R1/(R2+R3)]，通过设定R1，R2及R3的阻值，可控制Vref具体为16.47V。输入电压VAA具体可以为16.8V，电阻R4用于限流，通过设定R4的阻值，可以将流经R4的电流控制位为9.9mA。第二电容C2一端连接输入电压VAA，另一端接地；第三电容C3一端连接可控精密稳压源IC1的阴极C，另一端接地；第二电容C2和第三电容C3可分别对输入电压VAA和初始基准电压Vref进行滤波。初始基准电压产生模块10的输出端输出固定的初始基准电压Vref，初 始基准电压Vref主要是由输入电压VAA通过可控精密稳压源的分压产生，在产生后即不变，为输出特定的初始基准电压Vref，可通过设定初始基准电压产生模块10中各元件的具体参数实现。
在此实施例中，放电电路为增强型NMOS管Q1，其源极接地，漏极连接第一电容C1的第一端，栅极连接控制信号STV，控制信号STV用于在显示面板每一帧开始时打开该NMOS管Q1，清零第一电容C1上的充电电压V1后关闭NMOS管Q1，例如，可以在每一帧开始时使控制信号STV为高电平，清零充电电压V1后再转为低电平，通过控制NMOS管Q1的打开和关闭来控制是否清零充电电压V1。
直流电流源DC连接第一电容C1的第一端以产生随时间变化的充电电压V1，第一电容C1的第二端接地；第一电容C1的第一端连接减法器OP的负输入端以输入充电电压V1，减法器OP的正输入端输入初始基准电压Vref，减法器OP的输出端输出调整后基准电压Vref_Gamma，调整后基准电压Vref_Gamma可以输入可编程伽马电路(图未示)以用于由可编程伽马电路进一步产生相应的调整后的伽马电压。
在此实施例中，减法器OP设置为使调整后基准电压Vref_Gamma等于初始基准电压Vref减去充电电压V1，也就是调整后基准电压Vref_Gamma＝初始基准电压Vref－充电电压V1，由于充电电压V1在一帧时间内随充电过程不断变化，因此调整后基准电压Vref_Gamma也不断变化，具体来说随充电时间逐渐变长，充电电压V1逐渐变大，相应的调整后基准电压Vref_Gamma逐渐变小，调整后基准电压Vref_Gamma输入可编程伽马电路后得到的伽马电压也逐渐变小，也就是可编程伽马电路供给显示面板的伽马电压也逐渐变小。由于在显示面板每一帧开始时清零充电电压V1，因此此时本发明的显示控制电路所输出的调整后基准电压Vref_Gamma最大，等于初始基准电压Vref，相应的，可编程伽马电路供给显示面板数据驱动电路的伽马电压也最大，此时数据驱动电路对应驱动显示面板远端；而在显示面板每一帧结束时充电电压V1达到最大，本发明的显示控制电路所输出的调整后基准电压Vref_Gamma最小，相应的，可编程伽马电路供给显示面板数据驱动电路的伽马电压也最小，此时数据驱动电路对应驱动显示面板近端；也就是通过本发明的显示控制电路，由显示面板远端至近端供给显示面板的伽马电压逐渐变小，从而可以解决现有显示面板在近端偏亮、远端偏暗的问题。
在此实施例中，初始基准电压产生模块10所输出的固定的初始基准电压Vref的具体值可以根据显示面板远端所需伽马电压确定，这是由于在供 给显示面板相同的伽马电压的情况下，显示面板在近端偏亮，远端偏暗，为实现最终比较均匀的显示效果，也就是显示面板远端至近端亮度基本相同，远端所需的调整后基准电压Vref_Gamma相对于近端要更大；此实施例中将显示面板远端所需的调整后基准电压Vref_Gamma设置为等于初始基准电压产生模块10所输出的固定的初始基准电压Vref，显示面板其他区域(如中部区域、近端)所需的调整后基准电压Vref_Gamma利用固定的初始基准电压Vref减去逐渐变大的充电电压V1得到。
充电电压V1在显示面板一帧时间内的变化曲线可以根据显示面板不同区域所需调整后基准电压的变化趋势预先拟合得出，不同区域所需调整后基准电压可以根据显示面板由远端至近端不同区域所需伽马电压预先换算得出。例如，充电电压V1在显示面板一帧时间内的变化曲线可以预先根据显示面板远端、中部区域、及近端三个位置所需调整后基准电压的变化趋势拟合得出，也就是预先选取三个位置的数据作拟合，该三个位置所需调整后基准电压可以预先根据该三个位置所需伽马电压换算得出。更进一步，也可以选取显示面板上远端、中部区域、及近端三个位置以外的更多位置来进行拟合。电流源DC及第一电容C1都可以根据预先拟合得到的变化曲线预先设定，也就是选取合适的电流源DC及第一电容C1，以使实际充电过程更接近于预先得到的变化曲线。
参见图2，其为本发明显示控制电路一较佳实施例的充电电压V1与控制信号STV之间的关系示意图。控制信号STV在显示面板每一帧开始时为高电平，清零充电电压V1后再转为低电平，开始进行充电过程，可设定直流电流源DC输出恒流充电电流I，则第一电容C1上的充电电压V1＝充电电流I×充电时间t/第一电容C1。本发明的显示控制电路可以设置于现有可编程伽马电路的外部，将调整后基准电压Vref_Gamma输入现有可编程伽马电路的基准电压输入端，利用调整后基准电压Vref_Gamma产生伽马电压。
本发明通过调整伽马电压来补偿电阻电容延迟造成的近覆晶薄膜侧以及远覆晶薄膜侧充电的电压不相等的问题。具体来说，可以根据远端，中部区域，近端三个位置的所需伽马电压的大小，换算成基准电压的变化量，通过不同区域基准电压的变化来改变不同区域所需的伽马电压，使整个显示面板内显示比较均匀。
基于上述显示控制电路，本发明还提供了相应的平面显示装置，包含上述显示控制电路。本发明的平面显示装置可以为TFT-LCD平面显示装置或OLED平面显示装置。
本发明还提供了相应的显示控制方法，可以基于上述显示控制电路和平面显示装置进行实施，主要包括如下步骤：
电流源DC连接第一电容C1的第一端以产生一随时间变化的充电电压V1，第一电容C1的第二端接地；
放电电路连接第一电容C1的第一端，以在显示面板每一帧开始时清零充电电压V1；
减法器OP的负输入端连接第一电容C1的第一端以输入该充电电压V1，减法器的正输入端连接初始基准电压产生模块10的输出端，减法器的输出端输出显示面板的不同区域所需的调整后基准电压Vref_Gamma；
初始基准电压产生模块10的输出端输出固定的初始基准电压Vref；
该调整后基准电压Vref_Gamma用于产生伽马电压。
本发明利用基准电压产生模块10产生固定的初始基准电压Vref，初始基准电压Vref可以根据显示面板远端所需的最大伽马电压换算得到；直流电流源DC给第一电容C1充电，形成变化的充电电压V1，并且充电电压V1在显示面板每一帧开启时通过控制信号STV进行清零；将该初始基准电压Vref减去充电电压V1得到不同区域所需的调整后基准电压Vref_Gamma；将调整后基准电压Vref_Gamma作为基准电压输入可编程伽马电路的基准电压输入端，即可以实现对于伽马电压在同一帧，远近端不同的伽马电压调整。
其中，充电电压V1在显示面板一帧时间内按随时间变化的曲线变化，该曲线可以预先根据不同区域所需调整后基准电压的变化趋势拟合得出，不同区域所需调整后基准电压是根据显示面板由远端至近端不同区域所需伽马电压换算得出；通过选定合适的电流源DC和第一电容C1，可以使充电电压V1的变化符合预先拟合得到的曲线。
综上，本发明的显示控制电路、方法及平面显示装置实现了对于显示面板伽马电压在同一帧，远近端不同的伽马电压调整，实现了对整个显示面板显示特性的改善，且不会带来其他风险。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (14)

  1. 一种显示控制电路，包括：电流源、电容、放电电路、减法器以及初始基准电压产生模块；该电流源连接第一电容的第一端以产生一随时间变化的充电电压，该第一电容的第二端接地；该放电电路连接第一电容的第一端，以在显示面板每一帧开始时清零充电电压；该减法器的负输入端连接第一电容的第一端以输入该充电电压，减法器的正输入端连接初始基准电压产生模块的输出端，减法器的输出端输出显示面板的不同区域所需的调整后基准电压；该初始基准电压产生模块(10)的输出端输出固定的初始基准电压；所述调整后基准电压用于产生伽马电压。
  2. 如权利要求1所述的显示控制电路，其中，该放电电路为一NMOS管，其源极接地，漏极连接第一电容的第一端，栅极连接控制信号；该控制信号在显示面板每一帧开始时打开该NMOS管，清零充电电压后关闭该NMOS管。
  3. 如权利要求1所述的显示控制电路，其中，所述显示控制电路设置于可编程伽马电路的外部，该调整后基准电压输入该可编程伽马电路的基准电压输入端。
  4. 如权利要求1所述的显示控制电路，其中，该充电电压在显示面板一帧时间内的变化曲线根据显示面板远端、中部区域及近端三个位置所需调整后基准电压的变化趋势拟合得出，该三个位置所需调整后基准电压是根据该三个位置所需伽马电压换算得出。
  5. 如权利要求4所述的显示控制电路，其中，该电流源及第一电容根据该变化曲线预先设定。
  6. 如权利要求1所述的显示控制电路，其中，所述初始基准电压产生模块包括可控精密稳压源；所述可控精密稳压源的参考端和阴极之间连接第一电阻，参考端和阳极之间串联连接第二电阻和第三电阻，阴极经由第四电阻连接输入电压，阴极经由第五电阻输出初始基准电压，阳极接地。
  7. 一种平面显示装置，包括显示控制电路，所述显示控制电路包括：电流源、电容、放电电路、减法器以及初始基准电压产生模块；该电流源连接第一电容的第一端以产生一随时间变化的充电电压，该第一电容的第二端接地；该放电电路连接第一电容的第一端，以在显示面板每一帧开始时清零充电电压；该减法器的负输入端连接第一电容的第一端以输入该充电电压，减法器的正输入端连接初始基准电压产生模块的输出端，减法器 的输出端输出显示面板的不同区域所需的调整后基准电压；该初始基准电压产生模块(10)的输出端输出固定的初始基准电压；所述调整后基准电压用于产生伽马电压。
  8. 如权利要求7所述的平面显示装置，其中，该放电电路为一NMOS管，其源极接地，漏极连接第一电容的第一端，栅极连接控制信号；该控制信号在显示面板每一帧开始时打开该NMOS管，清零充电电压后关闭该NMOS管。
  9. 如权利要求7所述的平面显示装置，其中，所述显示控制电路设置于可编程伽马电路的外部，该调整后基准电压输入该可编程伽马电路的基准电压输入端。
  10. 如权利要求7所述的平面显示装置，其中，该充电电压在显示面板一帧时间内的变化曲线根据显示面板远端、中部区域及近端三个位置所需调整后基准电压的变化趋势拟合得出，该三个位置所需调整后基准电压是根据该三个位置所需伽马电压换算得出。
  11. 如权利要求10所述的平面显示装置，其中，该电流源及第一电容根据该变化曲线预先设定。
  12. 如权利要求7所述的平面显示装置，其中，所述初始基准电压产生模块包括可控精密稳压源；所述可控精密稳压源的参考端和阴极之间连接第一电阻，参考端和阳极之间串联连接第二电阻和第三电阻，阴极经由第四电阻连接输入电压，阴极经由第五电阻输出初始基准电压，阳极接地。
  13. 一种显示控制方法，包括如下步骤：
    电流源连接第一电容的第一端以产生一随时间变化的充电电压，第一电容的第二端接地；
    放电电路连接第一电容的第一端，以在显示面板每一帧开始时清零充电电压；
    减法器的负输入端连接第一电容的第一端以输入该充电电压，减法器的正输入端连接初始基准电压产生模块的输出端，减法器的输出端输出显示面板的不同区域所需的调整后基准电压；
    初始基准电压产生模块的输出端输出固定的初始基准电压；
    该调整后基准电压用于产生伽马电压。
  14. 如权利要求13所述的显示控制方法，其中，该充电电压在显示面板一帧时间内的变化曲线预先根据显示面板远端、中部区域、及近端三个位置所需调整后基准电压的变化趋势拟合得出，该三个位置所需调整后基准电压是根据该三个位置所需伽马电压换算得出。
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