WO2014190644A1 - 伽玛曲线调整方法及伽玛曲线调整装置 - Google Patents

伽玛曲线调整方法及伽玛曲线调整装置 Download PDF

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Publication number
WO2014190644A1
WO2014190644A1 PCT/CN2013/084301 CN2013084301W WO2014190644A1 WO 2014190644 A1 WO2014190644 A1 WO 2014190644A1 CN 2013084301 W CN2013084301 W CN 2013084301W WO 2014190644 A1 WO2014190644 A1 WO 2014190644A1
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Prior art keywords
transmittance
gamma curve
voltage
display device
gray voltage
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PCT/CN2013/084301
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English (en)
French (fr)
Inventor
张智
肖利军
王立岩
霍微伟
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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Priority to US14/373,982 priority Critical patent/US9704425B2/en
Publication of WO2014190644A1 publication Critical patent/WO2014190644A1/zh
Anticipated expiration legal-status Critical
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/2003Display of colours
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264Details of driving circuits
    • G09G2310/027Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0271Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276Adjustment 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0673Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

Definitions

  • the present invention relates to display technology, and in particular to a gamma curve adjustment method and a gamma curve adjustment device for a display device. Background technique
  • the input voltage applied to the pixel exhibits a nonlinear relationship with the pixel brightness/transmittance, and the curve exhibiting such a nonlinear relationship is called a gamma curve (Gamma curve). ).
  • the existing display device needs to perform voltage conversion based on a preset gamma characteristic curve during use, and the difference between the gamma value of the actual gamma characteristic curve of the display device and the target gamma value (generally 2.2) Determined the final display effect (the smaller the gap, the better the display).
  • an initial voltage is first output, and then the pixel brightness is tested, and it is determined whether the relationship between the two satisfies the power exponential relationship of 2.2. If not, the initial voltage is adjusted, and then the test is performed. The pixel brightness is further determined whether the relationship between the two satisfies the power exponential relationship of 2.2. The above process loops until the final voltage corresponding to the gray level is found, and the gamma curve is established according to the brightness corresponding to the voltage.
  • the technical problem to be solved by the present invention is to provide a gamma curve adjustment method and a gamma curve adjustment device, which improve the speed and efficiency of adjusting the gamma curve of the display device.
  • an embodiment of the present invention provides a gamma curve adjustment method for a display device, including the following steps:
  • the actual gamma curve of the display device driven by the target gray voltage is obtained as the final gamma curve.
  • obtaining a correspondence between a current gray voltage of the display device and the first transmittance may include:
  • determining the target gray voltage corresponding to each gray level according to the correspondence between the current gray voltage and the first transmittance and the ideal gamma curve may include: The gamma curve determines an ideal transmittance T corresponding to the gray level of the target gray voltage to be determined;
  • the target gray voltage corresponding to the gray level of the target gray voltage to be determined is determined as follows: (V2-V1)*(T-T1)/(T2-T1)+V1.
  • acquiring an actual gamma curve of the display device driven by the target gray voltage may include:
  • an embodiment of the present invention provides a gamma curve adjusting device for a display device, including:
  • a correspondence acquiring module configured to acquire a correspondence between a current gray voltage of the display device and a first transmittance, where the first transmittance is a transmittance of the display device driven by the current gray voltage
  • a voltage determining module configured to determine a target gray voltage corresponding to each gray level according to a correspondence between a current gray voltage and a first transmittance and an ideal gamma curve
  • a driving module configured to generate and output a target gray voltage corresponding to each gray level to the display device
  • a gamma curve acquiring module configured to acquire an actual gamma curve of the display device driven by the target gray voltage, as a final gamma curve.
  • the correspondence acquiring module may include: a first voltage determining unit, configured to perform an original correspondence relationship between the voltage and the transmittance of the display device and an ideal gamma curve Determining a current gray voltage corresponding to each gray level;
  • a driving unit configured to generate and output a current gray voltage corresponding to each gray level to the display device
  • a first testing unit configured to test a first transmittance of the display device driven by the current gray voltage
  • the first correspondence establishing unit is configured to establish a correspondence between the current gray voltage and the first transmittance according to the first transmittance obtained by the test.
  • the voltage determining module may include:
  • An ideal transmittance determining unit configured to determine an ideal transmittance T corresponding to a gray level of the current target gray voltage to be determined according to the ideal gamma curve
  • a selecting unit configured to select two adjacent transmittances T1 and T2 from the first transmittance, where T2>T>T1;
  • a second voltage determining unit configured to determine a current gray voltage VI corresponding to each of T1 and ⁇ 2
  • the third voltage determining unit is configured to determine a target gray voltage corresponding to the gray level of the target gray voltage to be determined as follows: (V2-V1)*(T-T1)/(T2-T1)+V1.
  • the gamma curve acquiring module specifically includes: a second testing unit, configured to test a second transmittance of the display device driven by the target gray voltage;
  • a second correspondence establishing unit configured to establish a correspondence between the target gray voltage and the second transmittance according to the second transmittance obtained by the testing
  • a gamma curve determining unit determines, according to a correspondence relationship between the target gray voltage and the second transmittance, and a correspondence relationship between the target gray voltage and the gray level, between the gray level and the second transmittance The actual gamma curve of the correspondence.
  • the embodiments of the present invention can obtain the following beneficial effects:
  • the display device is driven according to the obtained current gray voltage, and then the actual response of the display device under the current gray voltage driving is recorded, and then Adjusting the corresponding gray level corresponding to each gray level according to the actual response and the ideal gamma curve, the final gamma curve can be made as close as possible to the target target gray voltage, and finally the gamma of the acquired display device is tested by using the adjusted target gray voltage. curve. Therefore, compared with the prior art continuous trial process, the time for determining the gamma curve of the display device is greatly shortened, and the speed and efficiency are improved.
  • FIG. 1 is a schematic flow chart showing a gamma curve adjusting method of a display device according to an embodiment of the present invention
  • FIG. 2 is a schematic structural view showing a gamma curve adjusting device of a display device according to an embodiment of the present invention
  • FIG. 3 is a view showing a display device according to an embodiment of the present invention
  • the display device is driven according to the obtained voltage, and then the recording device is recorded under the voltage driving.
  • the recording device is recorded under the voltage driving.
  • Actual response then adjust the correspondence between the first determined gray level and voltage according to the actual response and the ideal gamma curve, and finally use the corresponding relationship between the adjusted gray level and voltage to test the gamma curve of the acquisition display device. , improved the speed and efficiency of adjusting the gamma curve of the display device.
  • step 101 a correspondence between a current gray voltage of the display device and a first transmittance is obtained, the first transmittance being a transmittance of the display device driven by the current gray voltage;
  • step 102 determining a target gray voltage corresponding to each gray level according to a correspondence between the current gray voltage and the first transmittance and an ideal gamma curve
  • step 103 a target gradation voltage corresponding to each gradation is generated and output to the display device; in step 104, an actual gamma curve of the display device driven by the target gradation voltage is acquired as a final gamma curve.
  • the display device is driven according to the obtained current gradation voltage, and further Recording the actual response of the display device under the current gray voltage driving, and then adjusting the corresponding gray level corresponding to each target according to the actual response and the ideal gamma curve, so that the final gamma curve is as close as possible to the target gray voltage of the target, and finally
  • the gamma curve of the acquisition display device is tested using the adjusted target gray voltage. Therefore, compared with the prior art continuous trial process, the time for determining the gamma curve of the display device is greatly shortened, and the speed and efficiency are improved.
  • the method of the embodiment of the present invention is actually an adjustment process of the gamma curve of the display device such that the gamma value of the final actual gamma curve is as close as possible to the target value (generally 2.2).
  • the method of the embodiment of the present invention does not try to approximate the target value one by one, but is divided into the following two steps: First, determining the current actual gray level and gray voltage between the display device Corresponding relationship, and then adjusting the voltage according to the correspondence between the current actual gray level and the gray voltage and the ideal gamma curve, so that the gamma curve of the display device is driven by the target gray voltage corresponding to the gray level Further close to the target value.
  • the method of the embodiment of the present invention actually determines the voltage corresponding to each gray level directly according to the difference between the current state and the target state, and the speed and efficiency thereof are far more than the prior art method of setting the voltage according to experience. Accurate and efficient.
  • the correspondence between the gray voltage and the transmittance is first determined, and the accuracy between the gray voltage and the transmittance affects the accuracy of the finally obtained gamma curve. degree.
  • the correspondence between the current gray voltage and the first transmittance is obtained by the following process, including:
  • the current gray voltage corresponding to each gray level can be determined under the correspondence of the original voltage and the transmittance.
  • the current gray voltage can be used to drive the display device. Further, the first transmittance of the display device driven by the current gray voltage is tested, and then the correspondence between the current gray voltage and the first transmittance is established.
  • the embodiment of the present invention further utilizes the ideal gamma.
  • the curve is adjusted to determine the target gray voltage corresponding to each gray level.
  • the ideal gamma curve is combined to determine the manner in which the gamma curve is as close as possible to the ideal gamma curve.
  • the determining, according to the correspondence between the current gray voltage and the first transmittance and the ideal gamma curve, the target gray voltage corresponding to each gray level may include:
  • the target gray voltage corresponding to the gray level of the target gray voltage to be determined is determined as follows: (V2-V1)*(T-T1)/(T2-T1)+V1.
  • the following is shown in 8 bits, and the gamma voltage is 14 as an example.
  • grayscale 224 corresponds to two current grayscale voltages (relative to The voltage distribution of the common electrode is symmetrically distributed, assuming Vn and Vm, and the gray scale 224 corresponds to two current gray voltages (symmetric distribution with respect to the voltage of the common electrode), and is defined as Vi and Vj, where Vn and Vi are between Between VI and V2, Vm and Vj are between V13 and V14, and Bell' J:
  • V2 (Vi-Vn)*(74.45-73.86)/(74.68-73.86)+Vn
  • V13 (Vj-Vm) *(74.45-73.86)/(74.68-73.86)+Vm
  • the other 12 gamma voltages can be obtained in the same way.
  • a specific implementation of acquiring an actual gamma curve of a display device driven by a target gray voltage includes:
  • the gamma curve device includes:
  • a correspondence acquiring module configured to acquire a correspondence between a current gray voltage of the display device and a first transmittance, where the first transmittance is a transmittance of the display device driven by the current gray voltage
  • a determining module configured to determine a target gray voltage corresponding to each gray level according to a correspondence between a current gray voltage and a first transmittance and an ideal gamma curve
  • a driving module configured to generate and output a target gray voltage corresponding to each gray level to the display device
  • a gamma curve acquiring module configured to acquire an actual gamma curve of the display device driven by the target gray voltage, as a final gamma curve.
  • the foregoing correspondence acquiring module may include:
  • a first voltage determining unit configured to determine a current gray voltage corresponding to each gray level according to an original correspondence between a voltage and a transmittance of the display device and an ideal gamma curve
  • a driving unit configured to generate and output a current gray voltage corresponding to each gray level to the display device
  • a first testing unit configured to test a first transmittance of the display device driven by the current gray voltage
  • the first correspondence establishing unit is configured to establish a correspondence between the current gray voltage and the first transmittance according to the first transmittance obtained by the test.
  • the voltage determining module may include: an ideal transmittance determining unit, configured to determine, according to the ideal gamma curve, an ideal transmission of the gray level corresponding to the target gray voltage to be determined. Rate T;
  • a selecting unit configured to select two adjacent transmittances T1 and T2 from the first transmittance, where T2>T>T1;
  • a second voltage determining unit configured to determine a current gray voltage VI corresponding to each of T1 and ⁇ 2
  • the third voltage determining unit is configured to determine a target gray voltage corresponding to the gray level of the target gray voltage to be determined as follows: (V2-V1)*(T-T1)/(T2-T1)+V1.
  • the gamma curve obtaining module may include: a second testing unit, configured to test a second transparent display device driven by the target gray voltage Over rate
  • a second correspondence establishing unit configured to establish a correspondence between the target gray voltage and the second transmittance according to the second transmittance obtained by the testing
  • a gamma curve determining unit determines, according to a correspondence relationship between the target gray voltage and the second transmittance, and a correspondence relationship between the target gray voltage and the gray level, between the gray level and the second transmittance The actual gamma curve of the correspondence.
  • the gamma curve adjusting device of the embodiment of the present invention may include the following parts: a host computer, a voltage providing chip, an optical test instrument, and a signal transfer board, wherein:
  • the upper computer is used for various calculations and control, and the voltage supply chip generates the required voltage output under the control of the upper computer to the display device to be tested to drive the display device to be tested, and the optical test instrument measures the display to be tested under the control of the upper computer.
  • the transmittance of the device, the signal transfer board lights up the display device to be tested under the control of the upper computer.
  • the upper computer and the voltage supply chip, the optical test instrument, and the signal transfer board may be connected to each other through a GPIO interface, a USB interface, and a DVI interface.
  • the host computer After obtaining the original V-T curve of the display device to be tested, the host computer first calculates the current gray voltage corresponding to each gray level (the first version voltage) based on the ideal gamma curve with a gamma value of 2.2;
  • the control voltage provides a chip to generate a current gray voltage corresponding to each gray level and outputs the current gray voltage to the display device to be tested;
  • the display device to be tested works; then the upper computer controls the test instrument to measure the light intensity of the display device to be tested, and then obtains the transmittance according to the light intensity calculation, and obtains the current The transmittance corresponding to the gray voltage.
  • the target gray voltage (second version voltage) close to the ideal gamma curve is determined by combining the ideal gamma curve. The process has been described in detail before. This is not repeated.
  • the upper computer controls the voltage again to provide the chip to generate the target gray voltage corresponding to each gray level and outputs it to the display device to be tested; the upper computer controls the test instrument to measure the light intensity of the display device to be tested, and then calculates the transmittance according to the light intensity calculation. , the transmittance corresponding to the target gray voltage is obtained.

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Abstract

一种伽玛曲线调整方法及伽玛曲线调整装置,该方法包括获取显示装置的当前灰度电压和第一透过率之间的对应关系(101),所述第一透过率为被当前灰度电压驱动的显示装置的透过率;根据当前灰度电压和第一透过率之间的对应关系和理想伽玛曲线确定每一灰度对应的目标灰度电压(102);生成并向显示装置输出每一个灰度对应的目标灰度电压(103);获取被目标灰度电压驱动的显示装置的实际伽玛曲线,作为最终伽玛曲线(104)。该伽玛曲线调整方法提高了伽玛曲线调整的速度和效率。

Description

伽玛曲线调整方法及伽玛曲线调整装置 技术领域
本发明涉及显示技术, 特别涉及一种用于显示装置的伽玛曲线调整方法 及伽玛曲线调整装置。 背景技术
在显示装置进行显示的时候, 施加到像素的输入电压与像素亮度 /透过率 之间呈现出一种非线性关系, 而体现这种非线性关系的曲线被称之为伽玛曲 线 ( Gamma曲线)。
现有的显示装置在使用过程中都需要基于一条预先设置的伽玛特性曲线 进行电压转换, 而显示装置的实际伽玛特性曲线的伽玛值与目标伽玛值(一 般取 2.2 )的差距大小决定了最终了的显示效果(差距越小, 显示效果越好)。
因此, 在显示装置实际销售到消费者 /使用者手中前都需要对显示装置进 行一定的测试, 得到一条伽玛值尽可能接近目标伽玛值的伽玛曲线。
在现有技术中, 对于某一个灰度, 先输出一个初始电压, 然后测试像素 亮度, 判定二者之间的关系是否满足 2.2 的幂指数关系, 如果不满足, 则调 整初始电压, 然后接着测试像素亮度, 进而判定二者之间的关系是否满足 2.2 的幂指数关系, 上述过程循环往复, 直至找到该灰度对应的最终电压, 并依 据该电压对应的亮度建立伽玛曲线。
可以发现, 上述确定伽玛曲线的过程相当烦瑣, 效率低下。 发明内容
本发明要解决的技术问题在于提供一种伽玛曲线调整方法及伽玛曲线调 整装置, 提高调整显示装置伽玛曲线的速度和效率。
为了解决上述技术问题, 本发明实施例提供了一种显示装置的伽玛曲线 调整方法, 包括下列步骤:
获取显示装置的当前灰度电压和第一透过率之间的对应关系, 所述第一 透过率为被当前灰度电压驱动的显示装置的透过率;
根据当前灰度电压和第一透过率之间的对应关系和理想伽玛曲线确定每 一灰度对应的目标灰度电压; 生成并向显示装置输出每一个灰度对应的目标灰度电压;
获取被目标灰度电压驱动的显示装置的实际伽玛曲线, 作为最终伽玛曲 线。
可选地, 在上述伽玛曲线调整方法中, 获取显示装置的当前灰度电压和 第一透过率之间的对应关系可包括:
根据所述显示装置的电压和透过率之间的原始对应关系和理想伽玛曲线 确定每一灰度对应的当前灰度电压;
生成并向显示装置输出每一灰度对应的当前灰度电压;
测试被所述当前灰度电压驱动的显示装置的第一透过率;
根据测试得到的第一透过率建立所述当前灰度电压和第一透过率之间的 对应关系。
可选地, 在上述伽玛曲线调整方法中, 根据当前灰度电压和第一透过率 之间的对应关系和理想伽玛曲线确定每一灰度对应的目标灰度电压可包括: 根据理想伽玛曲线确定当前待确定目标灰度电压的灰度对应的理想透过 率 T;
从所述第一透过率中选择两个相邻的透过率 T1和 T2, 其中 T2>T>T1; 确定 T1和 Τ2各自对应的当前灰度电压 VI和 V2;
确定当前待确定目标灰度电压的灰度对应的目标灰度电压如下: (V2-V1)*(T-T1)/(T2-T1)+V1。
可选地, 在上述伽玛曲线调整方法中, 获取被目标灰度电压驱动的显示 装置的实际伽玛曲线可包括:
测试被所述目标灰度电压驱动的显示装置的第二透过率;
根据测试得到的第二透过率建立所述目标灰度电压和第二透过率之间的 对应关系;
根据目标灰度电压和第二透过率之间的对应关系以及目标灰度电压和灰 度之间的对应关系确定描述所述灰度和第二透过率之间的对应关系的实际伽 玛曲线。
为了解决上述技术问题, 本发明实施例提供了一种显示装置的伽玛曲线 调整装置, 包括:
对应关系获取模块, 用于获取显示装置的当前灰度电压和第一透过率之 间的对应关系,所述第一透过率为被当前灰度电压驱动的显示装置的透过率; 电压确定模块, 用于根据当前灰度电压和第一透过率之间的对应关系和 理想伽玛曲线确定每一灰度对应的目标灰度电压;
驱动模块,用于生成并向显示装置输出每一个灰度对应的目标灰度电压; 伽玛曲线获取模块, 用于获取被目标灰度电压驱动的显示装置的实际伽 玛曲线, 作为最终伽玛曲线。
可选地, 在上述伽玛曲线调整装置中, 对应关系获取模块可包括: 第一电压确定单元, 用于根据所述显示装置的电压和透过率之间的原始 对应关系和理想伽玛曲线确定每一灰度对应的当前灰度电压;
驱动单元, 用于生成并向显示装置输出每一灰度对应的当前灰度电压; 第一测试单元, 用于测试被所述当前灰度电压驱动的显示装置的第一透 过率;
第一对应关系建立单元, 用于根据测试得到的第一透过率建立所述当前 灰度电压和第一透过率之间的对应关系。
可选地, 在上述伽玛曲线调整装置中, 电压确定模块可包括:
理想透过率确定单元, 用于根据理想伽玛曲线确定当前待确定目标灰度 电压的灰度对应的理想透过率 T;
选择单元, 用于从所述第一透过率中选择两个相邻的透过率 T1和 T2, 其中 T2>T>T1;
第二电压确定单元, 用于确定 T1和 Τ2各自对应的当前灰度电压 VI和
V2;
第三电压确定单元, 用于确定当前待确定目标灰度电压的灰度对应的目 标灰度电压如下: (V2-V1)*(T-T1)/(T2-T1)+V1。
可选地, 在上述伽玛曲线调整装置中, 伽玛曲线获取模块具体包括: 第二测试单元, 用于测试被所述目标灰度电压驱动的显示装置的第二透 过率;
第二对应关系建立单元, 用于根据测试得到的第二透过率建立所述目标 灰度电压和第二透过率之间的对应关系;
伽玛曲线确定单元, 根据目标灰度电压和第二透过率之间的对应关系以 及目标灰度电压和灰度之间的对应关系确定描述所述灰度和第二透过率之间 的对应关系的实际伽玛曲线。
本发明实施例可获得如下的有益效果: 本发明实施例中, 首次确定灰度和灰度电压之间的对应关系后, 依据得 到的当前灰度电压来驱动显示装置, 进而记录显示装置在该当前灰度电压驱 动下的实际响应, 然后依据实际响应和理想伽玛曲线来调整每一灰度对应的 能够使得最终的伽玛曲线尽可能接近目标的目标灰度电压, 最后利用调整后 的目标灰度电压来测试获取显示装置的伽玛曲线。 因此, 相对于现有技术的 不断尝试过程, 大大缩短了确定显示装置伽玛曲线的时间, 提高了速度和效 率。 附图说明
图 1表示本发明实施例的显示装置的伽玛曲线调整方法的流程示意图; 图 2表示本发明实施例的显示装置的伽玛曲线调整装置的结构示意图; 图 3表示本发明实施例的显示装置的实际应用架构示意图。 具体实施方式
本发明实施例的伽玛曲线调整方法及伽玛曲线调整装置中, 首次确定灰 度和电压之间的对应关系后, 依据得到的电压来驱动显示装置, 进而记录显 示装置在该电压驱动下的实际响应, 然后依据实际响应和理想伽玛曲线来调 整首次确定的灰度和电压之间的对应关系, 最后利用调整后的灰度和电压之 间的对应关系来测试获取显示装置的伽玛曲线, 提高了调整显示装置伽玛曲 线的速度和效率。
如图 1所示, 本发明实施例的显示装置的伽玛曲线调整方法的工作过程 :¾口下:
在步骤 101 中, 获取显示装置的当前灰度电压和第一透过率之间的对应 关系, 所述第一透过率为被当前灰度电压驱动的显示装置的透过率;
在步骤 102中, 根据当前灰度电压和第一透过率之间的对应关系和理想 伽玛曲线确定每一灰度对应的目标灰度电压;
在步骤 103中,生成并向显示装置输出每一个灰度对应的目标灰度电压; 在步骤 104中, 获取被目标灰度电压驱动的显示装置的实际伽玛曲线, 作为最终伽玛曲线。
本发明实施例的显示装置的伽玛曲线调整方法中, 首次确定灰度和灰度 电压之间的对应关系后, 依据得到的当前灰度电压来驱动显示装置, 进而记 录显示装置在该当前灰度电压驱动下的实际响应, 然后依据实际响应和理想 伽玛曲线来调整每一灰度对应的能够使得最终的伽玛曲线尽可能接近目标的 目标灰度电压, 最后利用调整后的目标灰度电压来测试获取显示装置的伽玛 曲线。 因此, 相对于现有技术的不断尝试过程, 大大缩短了确定显示装置伽 玛曲线的时间, 提高了速度和效率。
本发明实施例的方法实际上是对显示装置的伽玛曲线的调整过程, 使得 最终的实际伽玛曲线的伽玛值尽可能接近目标值(一般为 2.2 )。 而且不同于 现有技术的方法, 本发明实施例的方法并不是逐个尝试来逼近目标值, 而是 分为以下两个步骤: 首先, 确定显示装置的当前实际的灰度和灰度电压之间 的对应关系, 然后, 依据当前实际的灰度和灰度电压之间的对应关系和理想 伽玛曲线来调节电压, 使得在对应灰度的目标灰度电压的驱动下, 显示装置 的伽玛曲线进一步接近目标值。
因此, 本发明实施例的方法实际上是根据当前状态与目标状态之间的差 异来直接确定每一个灰度对应的电压, 其速度和效率远比现有技术根据经验 来设置电压的方式更为准确, 效率也更高。
在本发明的示例性实施例中, 首先要确定灰度电压和透过率之间的对应 关系, 而该灰度电压和透过率之间的准确度会影响最终得到的伽玛曲线的准 确度。
因此, 在本发明的示例性实施例中, 对于当前灰度电压和第一透过率之 间的对应关系通过如下过程获取, 包括:
根据所述显示装置的电压和透过率之间的原始对应关系和理想伽玛曲线 确定每一灰度对应的当前灰度电压;
生成并向显示装置输出每一灰度对应的当前灰度电压;
测试被所述当前灰度电压驱动的显示装置的第一透过率;
根据测试得到的第一透过率建立所述当前灰度电压和第一透过率之间的 对应关系。
一般而言, 显示装置在生产之后, 其电压和透过率之间就具有一个原始 对应关系, 而该原始对应关系可能并不准确。 此时, 考虑到理想伽玛曲线, 即可确定在该原始的电压和透过率的对应关系下, 每一个灰度对应的当前灰 度电压。
而在当前灰度电压确定之后,即可利用该当前灰度电压来驱动显示装置, 进而测试被所述当前灰度电压驱动的显示装置的第一透过率, 然后建立当前 灰度电压和第一透过率之间的对应关系。
在通过上述过程建立当前灰度电压和第一透过率之间的对应关系后, 可 能该对应关系并不能够使得实际的伽玛曲线达到预设目标, 因此本发明实施 例进一步利用理想伽玛曲线进行调整, 确定每一灰度对应的目标灰度电压。
在确定当前灰度电压和第一透过率之后, 结合理想伽玛曲线来确定使得 伽玛曲线尽可能接近理想伽玛曲线的方式多种多样。 下面对其中的一种示例 性实施方式说明如下。
本发明实施例的根据当前灰度电压和第一透过率之间的对应关系和理想 伽玛曲线确定每一灰度对应的目标灰度电压可包括:
根据理想伽玛曲线确定当前待确定目标灰度电压的灰度对应的理想透过 率 T;
从所述第一透过率中选择两个相邻的透过率 T1和 T2, 其中 T2>T>T1; 确定 T1和 Τ2各自对应的当前灰度电压 VI和 V2;
确定当前待确定目标灰度电压的灰度对应的目标灰度电压如下: (V2-V1)*(T-T1)/(T2-T1)+V1。
下面以 8bit显示, 且伽玛电压为 14个为例进行说明。
如以下表 1所示, 14个伽玛电压与灰度的对应关系如下:
Figure imgf000008_0001
表 1
而具体如何利用上述的几个灰度与伽玛电压 (灰度电压) 的对应关系计
假定测试结果如下表 2所示: 灰度 测试透过率 理想透过率
t t t t t t t t t
L219 70.15% 71.55%
L220 70.76% 72.27%
L221 71.53% 72.99%
L222 72.24% 73.72%
L223 73.17% 74.45%
L224 73.86% 75.19%
L225 74.68% 75.93%
L226 75.46% 76.67%
L227 76.00% 77.42%
L228 76.63% 78.18%
L229 77.28% 78.93%
L230 78.02% 79.69%
, , , , , , , , ,
表 2
假定当前需要确定 223灰度对应的目标灰度电压 V2和 V13 ,则查找以上 表 2可以发现, 223灰度的理想透过率为 74.45%。
可以发现, 74.45%位于相邻的测试透过率 73.86% (对应于灰度 224 )和 74.68% (对应于灰度 225 )之间, 而灰度 224对应于两个当前灰度电压 (相 对于公共电极的电压对称分布), 假定为 Vn和 Vm, 而灰度 224对应于两个 当前灰度电压(相对于公共电极的电压对称分布), 支定为 Vi和 Vj , 其中 Vn 和 Vi介于 VI和 V2之间, Vm和 Vj介于 V13和 V14之间, 贝' J :
V2=(Vi-Vn)*(74.45-73.86)/(74.68-73.86)+Vn
V13=(Vj-Vm) *(74.45-73.86)/(74.68-73.86)+Vm
采用同样的方法可以得到其他的 12个伽玛电压。
在本发明的示例性实施例中, 获取被目标灰度电压驱动的显示装置的实 际伽玛曲线的一种具体实现方式包括:
测试被所述目标灰度电压驱动的显示装置的第二透过率;
根据测试得到的第二透过率建立所述目标灰度电压和第二透过率之间的 对应关系; 根据目标灰度电压和第二透过率之间的对应关系以及目标灰度电压和灰 度之间的对应关系确定描述所述灰度和第二透过率之间的对应关系的实际伽 玛曲线。
图 2示出本发明实施例的一种显示装置的伽玛曲线调整装置。 如图 2所 示, 该伽玛曲线装置包括:
对应关系获取模块, 用于获取显示装置的当前灰度电压和第一透过率之 间的对应关系,所述第一透过率为被当前灰度电压驱动的显示装置的透过率; 电压确定模块, 用于根据当前灰度电压和第一透过率之间的对应关系和 理想伽玛曲线确定每一灰度对应的目标灰度电压;
驱动模块,用于生成并向显示装置输出每一个灰度对应的目标灰度电压; 伽玛曲线获取模块, 用于获取被目标灰度电压驱动的显示装置的实际伽 玛曲线, 作为最终伽玛曲线。
可选地, 上述对应关系获取模块可包括:
第一电压确定单元, 用于根据所述显示装置的电压和透过率之间的原始 对应关系和理想伽玛曲线确定每一灰度对应的当前灰度电压;
驱动单元, 用于生成并向显示装置输出每一灰度对应的当前灰度电压; 第一测试单元, 用于测试被所述当前灰度电压驱动的显示装置的第一透 过率;
第一对应关系建立单元, 用于根据测试得到的第一透过率建立所述当前 灰度电压和第一透过率之间的对应关系。
可选地, 在上述的伽玛曲线调整装置中, 电压确定模块可包括: 理想透过率确定单元, 用于根据理想伽玛曲线确定当前待确定目标灰度 电压的灰度对应的理想透过率 T;
选择单元, 用于从所述第一透过率中选择两个相邻的透过率 T1和 T2, 其中 T2>T>T1;
第二电压确定单元, 用于确定 T1和 Τ2各自对应的当前灰度电压 VI和
V2;
第三电压确定单元, 用于确定当前待确定目标灰度电压的灰度对应的目 标灰度电压如下: (V2-V1)*(T-T1)/(T2-T1)+V1。
可选地, 在上述的伽玛曲线调整装置中, 伽玛曲线获取模块可包括: 第二测试单元, 用于测试被所述目标灰度电压驱动的显示装置的第二透 过率;
第二对应关系建立单元, 用于根据测试得到的第二透过率建立所述目标 灰度电压和第二透过率之间的对应关系;
伽玛曲线确定单元, 根据目标灰度电压和第二透过率之间的对应关系以 及目标灰度电压和灰度之间的对应关系确定描述所述灰度和第二透过率之间 的对应关系的实际伽玛曲线。
下面结合图 3对本发明实施例的具体应用进行详细说明。
如图 3所示, 在具体应用过程中, 本发明实施例的伽玛曲线调整装置可 以包括如下的几个部分: 上位机、 电压提供芯片、 光学测试仪器和信号转接 板, 其中:
上位机用于各种计算和控制, 而电压提供芯片在上位机的控制下生成需 要的电压输出到待测试显示装置来驱动待测试显示装置, 光学测试仪器在上 位机的控制下测量待测试显示装置的透过率, 信号转接板在上位机的控制下 点亮待测试显示装置。
然而, 上位机与电压提供芯片、 光学测试仪器和信号转接板之间可以但 不限于通过 GPIO接口、 USB接口和 DVI接口连接。
下面对其工作过程详细说明如下。
上位机首先在获取待测试显示装置的原始 V-T曲线后,基于伽玛值为 2.2 的理想伽玛曲线计算出每一灰度对应的当前灰度电压 (第一版电压);
然后上位机控制信号转接板点亮待测试显示装置后, 控制电压提供芯片 生成每一灰度对应的当前灰度电压并输出到待测试显示装置;
在当前灰度电压和信号转接板的共同驱动下, 待测试显示装置工作; 然后上位机控制测试仪器测量待测试显示装置的光强, 进而根据光强计 算得到透过率之后, 得到与当前灰度电压对应的透过率。
在上位机得到当前灰度电压与透过率的关系之后, 结合理想伽玛曲线确 定接近理想伽玛曲线的目标灰度电压(第二版电压 ), 其过程已经在之前进行 了详细描述, 在此不再重复描述。
上位机再次控制电压提供芯片生成每一灰度对应的目标灰度电压并输出 到待测试显示装置; 上位机控制测试仪器测量待测试显示装置的光强, 进而 根据光强计算得到透过率之后, 得到与目标灰度电压对应的透过率。
最后依据测试得到的与目标灰度电压对应的透过率得到对应于第二版电 压的最终的伽玛曲线, 完成伽玛调整。
以上所述是本发明的示例性实施方式, 应当指出, 对于本技术领域的普 通技术人员来说, 在不脱离本发明所述原理的前提下, 还可以作出若干改进 和润饰, 这些改进和润饰也应视为本发明的保护范围。

Claims

权 利 要 求 书
1. 一种显示装置的伽玛曲线调整方法, 包括:
获取显示装置的当前灰度电压和第一透过率之间的对应关系,所述第一透 过率为被当前灰度电压驱动的显示装置的透过率;
根据当前灰度电压和第一透过率之间的对应关系和理想伽玛曲线确定每 一灰度对应的目标灰度电压;
生成并向显示装置输出每一个灰度对应的目标灰度电压;
获取被目标灰度电压驱动的显示装置的实际伽玛曲线, 作为最终伽玛曲 线。
2. 根据权利要求 1 所述的伽玛曲线调整方法, 其中, 获取显示装置的当 前灰度电压和第一透过率之间的对应关系包括:
根据所述显示装置的电压和透过率之间的原始对应关系和理想伽玛曲线 确定每一灰度对应的当前灰度电压;
生成并向显示装置输出每一灰度对应的当前灰度电压;
测试被所述当前灰度电压驱动的显示装置的第一透过率;
根据测试得到的第一透过率建立所述当前灰度电压和第一透过率之间的 对应关系。
3. 根据权利要求 2所述的伽玛曲线调整方法, 其中, 根据当前灰度电压 和第一透过率之间的对应关系和理想伽玛曲线确定每一灰度对应的目标灰度 电压包括:
根据理想伽玛曲线确定当前待确定目标灰度电压的灰度对应的理想透过 率 T;
从所述第一透过率中选择两个相邻的透过率 T1和 T2, 其中 T2>T>T1; 确定 T1和 Τ2各自对应的当前灰度电压 VI和 V2;
确定当前待确定目标灰度电压的灰度对应的目标灰度电压如下: (V2-V1)*(T-T1)/(T2-T1)+V1。
4. 根据权利要求 1-3之一所述的伽玛曲线调整方法,其中,获取被目标灰 度电压驱动的显示装置的实际伽玛曲线包括:
测试被所述目标灰度电压驱动的显示装置的第二透过率; 根据测试得到的第二透过率建立所述目标灰度电压和第二透过率之间的 对应关系;
根据目标灰度电压和第二透过率之间的对应关系以及目标灰度电压和灰 度之间的对应关系确定描述所述灰度和第二透过率之间的对应关系的实际伽 玛曲线。
5. 一种显示装置的伽玛曲线调整装置, 包括:
对应关系获取模块,用于获取显示装置的当前灰度电压和第一透过率之间 的对应关系, 所述第一透过率为被当前灰度电压驱动的显示装置的透过率; 电压确定模块,用于根据当前灰度电压和第一透过率之间的对应关系和理 想伽玛曲线确定每一灰度对应的目标灰度电压;
驱动模块, 用于生成并向显示装置输出每一个灰度对应的目标灰度电压; 伽玛曲线获取模块,用于获取被目标灰度电压驱动的显示装置的实际伽玛 曲线, 作为最终伽玛曲线。
6. 根据权利要求 5所述的伽玛曲线调整装置, 其中, 对应关系获取模块 包括:
第一电压确定单元,用于根据所述显示装置的电压和透过率之间的原始对 应关系和理想伽玛曲线确定每一灰度对应的当前灰度电压;
驱动单元, 用于生成并向显示装置输出每一灰度对应的当前灰度电压; 第一测试单元,用于测试被所述当前灰度电压驱动的显示装置的第一透过 率;
第一对应关系建立单元,用于根据测试得到的第一透过率建立所述当前灰 度电压和第一透过率之间的对应关系。
7. 根据权利要求 6所述的伽玛曲线调整装置, 其中, 电压确定模块包括: 理想透过率确定单元,用于根据理想伽玛曲线确定当前待确定目标灰度电 压的灰度对应的理想透过率 T;
选择单元, 用于从所述第一透过率中选择两个相邻的透过率 T1和 T2; 其 中 T2>T>T1;
第二电压确定单元, 用于确定 T1和 Τ2各自对应的当前灰度电压 VI和
V2;
第三电压确定单元,用于确定当前待确定目标灰度电压的灰度对应的目标 灰度电压如下: (V2-V1)*(T-T1)/(T2-T1)+V1。
8. 根据权利要求 5或 6或 7所述的伽玛曲线调整装置, 其中于, 伽玛曲 线获取模块包括:
第二测试单元,用于测试被所述目标灰度电压驱动的显示装置的第二透过 率;
第二对应关系建立单元,用于根据测试得到的第二透过率建立所述目标灰 度电压和第二透过率之间的对应关系;
伽玛曲线确定单元,根据目标灰度电压和第二透过率之间的对应关系以及 目标灰度电压和灰度之间的对应关系确定描述所述灰度和第二透过率之间的 对应关系的实际伽玛曲线。
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KR101845506B1 (ko) * 2014-12-26 2018-04-04 시아오미 아이엔씨. 액정디스플레이 조정방법, 조정장치, 프로그램 및 기록매체
US10109248B2 (en) 2014-12-26 2018-10-23 Xiaomi Inc. Method and device for adjusting liquid crystal display

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