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CN105989808B - 液晶显示器的伽玛曲线校正方法 - Google Patents

液晶显示器的伽玛曲线校正方法 Download PDF

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Publication number
CN105989808B
CN105989808B CN201510042310.4A CN201510042310A CN105989808B CN 105989808 B CN105989808 B CN 105989808B CN 201510042310 A CN201510042310 A CN 201510042310A CN 105989808 B CN105989808 B CN 105989808B
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gamma voltages
gamma
liquid crystal
crystal display
positive
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CN105989808A (zh
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王德峻
左仲先
林峻毅
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Richtek Technology Corp
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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
    • G09G3/34Control 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
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • G09G3/3655Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • 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
    • G09G2320/0247Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Power Engineering (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

一种液晶显示器的伽玛曲线校正方法,其将该液晶显示器的接地电位设定为基准电压,接着再调整多个正伽玛电压及多个负伽玛电压其中至少一个,以使由该多个正伽玛电压及该多个负伽玛电压形成的伽玛曲线的电压中心值向该基准电压靠拢,进而改善液晶显示器的画面闪烁问题。

Description

液晶显示器的伽玛曲线校正方法
技术领域
本发明有关一种改善液晶显示器画面闪烁的方法,特别是关于一种液晶显示器的伽玛(gamma)曲线校正方法。
背景技术
在液晶显示器中,伽玛曲线及基准电压Vcom影响液晶显示器的颜色及画面的平整度。由于液晶显示器的液晶分子无法固定在某一个电压太久,所以驱动液晶分子的伽玛电压就会分成正极性与负极性,当基准电压Vcom在正伽玛电压及负伽玛电压的中心时,即基准电压Vcom等于伽玛曲线的电压中心值时,与基准电压Vcom具有相同压差的正伽玛电压及负伽玛电压就会有相同亮度的灰阶。
图1显示伽玛曲线10及基准电压Vcom,其中伽玛曲线10是由多个正伽玛电压PV0-PV1023及多个负伽玛电压NV0-NV1023组成,多个正伽玛电压PV0-PV1023及多个负伽玛电压NV0-NV1023控制液晶显示器的灰阶D0-D1023。图2显示控制基准电压Vcom的电路,其系利用运算放大器16产生及控制基准电压Vcom。如图1所示,当基准电压Vcom不在伽玛曲线10的电压中心值14时,液晶显示器的画面将出现闪烁,此时可以藉由调整提供至运算放大器16的设定信号Vset来调整基准电压Vcom,使其等于伽玛曲线10的电压中心值14,进而改善画面闪烁问题。然而,习知调整基准电压Vcom的方法,需要额外的运算放大器16,而且运算放大器16需要驱动电流造成额外的功率损失,运算放大器16的频宽也限制了其无法在基准电压Vcom快速变化时,立即校正基准电压Vcom。此外,如图2的波形18所示,运算放大器16提供的基准电压Vcom会上下振荡,并非定值,这导致灰阶闪烁,进而降低显示效能。
发明内容
本发明的目的在于,提出一种液晶显示器的伽玛曲线校正方法。
本发明的技术方案是提供一种液晶显示器的伽玛曲线校正方法,包括将该液晶显示器的接地电位设定为基准电压,接着再调整多个正伽玛电压及多个负伽玛电压其中至少一个,以使由该多个正伽玛电压及该多个负伽玛电压形成的伽玛曲线的电压中心值向该基准电压靠拢,其中该多个正伽玛电压及该多个负伽玛电压系用以控制该液晶显示器的灰阶。
本发明的伽玛曲线校正方法无需使用运算放大器来调整基准电压,故可以减少成本及功率损失,而且液晶显示器的接地电位为一固定值,因此基准电压不会发生振荡而导致灰阶闪烁,具有较佳的显示效能。
附图说明
图1显示伽玛曲线及基准电压Vcom;
图2显示控制基准电压Vcom的电路;
图3显示本发明伽玛曲线校正方法的流程
图4显示应用本发明伽玛曲线校正方法后的电路架构;
图5显示图3中步骤S22的第一实施例;
图6显示图3中步骤S22的第二实施例;以及
图7显示图3中步骤S22的第三实施例。
主要元件符号说明
10 伽玛曲线
12 基准电压Vcom
14 伽玛曲线10的电压中心值
16 运算放大器
18 基准电压Vcom的波形
具体实施方式
图3显示本发明伽玛曲线校正方法的流程。参照图1及图3,本发明伽玛曲线校正方法系将液晶显示器的接地电位GND设定为基准电压Vcom,如步骤S20所示。接着步骤S22调整多个正伽玛电压PV0-PV1023及多个负伽玛电压NV0-NV1023其中至少一个,以使伽玛曲线10的电压中心值14向基准电压Vcom靠拢,以改善液晶显示器的画面闪烁问题。较佳者,调整后的伽玛曲线10的电压中心值14等于基准电压Vcom。图4显示应用本发明伽玛曲线校正方法后的电路架构,其无需再使用运算放大器16,故可以减少成本及功率损失,而且液晶显示器的接地电位GND为一固定值,因此基准电压Vcom不会发生振荡而导致灰阶闪烁,故具有较佳的显示效能。
图5显示图3中步骤S22的第一实施例,其包括步骤S24设定一偏移值Vos,接着步骤S26再根据偏移值Vos偏移多个正伽玛电压PV0-PV1023及多个负伽玛电压NV0-NV1023其中至少一个,以调整伽玛曲线10的电压中心值14。例如,可以只偏移最大的正加玛电压PV1023或最小的负伽玛电压NV1023以调整伽玛曲线10的电压中心值14,或者同时偏移所有的正伽玛电压PV0-PV1023及负伽玛电压NV0-NV1023以偏移伽玛曲线10的电压中心值14。在已知技术中,已有电路及方法可以计算出伽玛电压与基准电压Vcom之间的差值,只要根据该差值就可以设定适当的偏移值Vos。
图6显示图3中步骤S22的第二实施例,其包括步骤S28计算最大正伽玛电压PV1023及最小负伽玛电压NV1023之间的平均值Vavg。接着如步骤S30所示,取得该平均值与基准电压Vcom之间的差值Vdif。最后进行步骤S32,根据差值Vdif偏移所有正伽玛电压PV0-PV1023及负伽玛电压NV0-NV1023,以偏移伽玛曲线10的电压中心值14。在其他实施例中,也可以只偏移正伽玛电压PV0-PV1023及负伽玛电压NV0-NV1023的其中一部分。
图7显示图3中步骤S22的第三实施例,其包括步骤S34藉由一内部整合电路(inter-integrated circuit)计算多个正伽玛电压PV0-PV1023及多个负伽玛电压NV0-NV1023各自的偏移值,并据以调整多个正伽玛电压PV0-PV1023及多个负伽玛电压NV0-NV1023。在已知技术中,已可以利用原有的内部整合电路计算出每一个伽玛电压与基准电压Vcom之间的差值,因此可以针对个别的伽玛电压设定适当的偏移值。在其他实施例中,也可以只对正伽玛电压PV0-PV1023及负伽玛电压NV0-NV1023的其中一部分进行偏移。

Claims (4)

1.一种液晶显示器的伽玛曲线校正方法,其特征在于,该液晶显示器具有多个正伽玛电压及多个负伽玛电压用以控制该液晶显示器的灰阶,该伽玛曲线校正方法包括下列步骤:
将该液晶显示器的接地电位设定为基准电压;
调整该多个正伽玛电压及该多个负伽玛电压其中至少一个,以使由该多个正伽玛电压及该多个负伽玛电压形成的伽玛曲线的电压中心值向该基准电压靠拢。
2.如权利要求1的伽玛曲线校正方法,其特征在于,该调整该多个正伽玛电压及该多个负伽玛电压其中至少一个的步骤包括:
设定一偏移值;以及
根据该偏移值偏移该多个正伽玛电压及该多个负伽玛电压其中至少一个。
3.如权利要求1的伽玛曲线校正方法,其特征在于该调整该多个正伽玛电压及该多个负伽玛电压其中至少一个的步骤包括:
计算该多个正伽玛电压中的最大值及该多个负伽玛电压中的最小值之间的平均值;
取得该平均值与该基准电压之间的差值;以及
根据该差值偏移该多个正伽玛电压及该多个负伽玛电压。
4.如权利要求1的伽玛曲线校正方法,其特征在于该调整该多个正伽玛电压及该多个负伽玛电压其中至少一个的步骤包括藉由一内部整合电路计算该多个正伽玛电压及该多个负伽玛电压各自的偏移值,并据以调整该多个正伽玛电压及该多个负伽玛电压。
CN201510042310.4A 2014-12-11 2015-01-28 液晶显示器的伽玛曲线校正方法 Expired - Fee Related CN105989808B (zh)

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