Method and system for adjusting gamma voltage, and electronic device

Patent metadata

Field	Value
Publication number	US-2016343340-A1
Application number	US-201314368020-A
Country	US
Kind code	A1
Filing date	Dec 17, 2013
Priority date	Jul 5, 2013
Publication date	Nov 24, 2016
Grant date	—

Abstract

The method for adjusting a gamma voltage comprises: applying a reference common electrode voltage and a to-be-adjusted gamma voltage to a display module; collecting first light intensity data when the display module displays a grayscale test pattern after the reference common electrode voltage and the to-be-adjusted gamma voltage are applied; plotting a testing gamma curve in accordance with the first light intensity data; when the testing gamma curve is not located within the acceptable range of the standard gamma curve, adjusting the to-be-adjusted gamma voltage currently applied to the display module, until the testing gamma curve is located within the acceptable range of the standard gamma curve; and when the testing gamma curve is located within the acceptable range of the standard gamma curve, determining the to-be-adjusted gamma voltage currently applied to the display module as a final gamma voltage.

First claim

What is claimed is:

1 . A method for adjusting a gamma voltage, comprising:
applying a reference common electrode voltage and a to-be-adjusted gamma voltage to a display module; collecting first light intensity data when the display module displays a grayscale test pattern after the reference common electrode voltage and the to-be-adjusted gamma voltage are applied; plotting a testing gamma curve in accordance with the first light intensity data; judging whether or not the testing gamma curve is located within an acceptable range of a standard gamma curve; when the testing gamma curve is not located within the acceptable range of the standard gamma curve, adjusting the to-be-adjusted gamma voltage currently applied to the display module, until the testing gamma curve is located within the acceptable range of the standard gamma curve; and when the testing gamma curve is located within the acceptable range of the standard gamma curve, determining the to-be-adjusted gamma voltage currently applied to the display module as a final gamma voltage.

2 . The method according to claim 1 , wherein prior to the step of applying the reference common electrode voltage and the to-be-adjusted gamma voltage to the display module, the method further comprises:
applying a to-be-adjusted common electrode voltage and the to-be-adjusted gamma voltage to the display module; collecting second light intensity data when the display module displays a flicker pattern after the to-be-adjusted common electrode voltage and the to-be-adjusted gamma voltage are applied; judging whether or not the second light intensity data is located within a light intensity data range of a standard flicker pattern; when the second light intensity data is not located within the light intensity data range of the standard flicker pattern, adjusting the to-be-adjusted common electrode voltage currently applied to the display module, until the second light intensity data is located within the light intensity data range of the standard flicker pattern; and when the second light intensity data is located within the light intensity data range of the standard flicker pattern, determining the to-be-adjusted common electrode voltage currently applied to the display module as the reference common electrode voltage.

3 . The method according to claim 2 , wherein prior to the step of applying the to-be-adjusting common electrode and the to-be-adjusted gamma voltage to the display module, the method further comprises:
acquiring the to-be-adjusted common electrode voltage by the equation VCOM=[V(max)−V(min)]/2, wherein VCOM represents the to-be-adjusted common electrode voltage, V(min) represents an absolute grayscale voltage of a minimum grayscale of the display module, and V(max) represents an absolute grayscale voltage of a maximum grayscale of the display module.

4 . The method according to claim 2 , wherein prior to the step of applying the reference common electrode voltage and the to-be-adjusted gamma voltage to the display module, the method further comprises:
acquiring the transmittance of a predetermined grayscale in accordance with a transmittance-grayscale curve of the display module T=(Gray/((2̂n)−1))̂γ, wherein T represents the transmittance, Gray represents the grayscale, n represents a color level of the display module, and γ represents a gamma value of a standard gamma curve; acquiring a voltage of the predetermined grayscale in accordance with the transmittance of the predetermined grayscale and a voltage-transmittance curve of the display module; acquiring a voltage corresponding to the lowest transmittance and a voltage corresponding to the highest transmittance in accordance with the voltage-transmittance curve of the display module, and calculating a sum of the voltage corresponding to the lowest transmittance and the voltage corresponding to the highest transmittance, so as to obtain a center voltage of the display module; and generating the to-be-adjusted gamma voltage in accordance with the voltage of the predetermined grayscale and the center voltage.

5 . The method according to claim 2 , wherein the step of adjusting the to-be-adjusted common electrode voltage currently applied to the display module comprises:
increasing or decreasing the to-be-adjusted common electrode voltage currently applied to the display module by a first step value, to obtain a new to-be-adjusted common electrode voltage; collecting the second light intensity data when the display module displays the flicker pattern after the new to-be-adjusted common electrode voltage and the to-be-adjusted gamma voltage are applied; judging whether or not the second light intensity data collected currently is located within the light intensity data range of the standard flicker pattern; when the second light intensity data collected currently is not within the light intensity data range of the standard flicker pattern, judging whether or not a difference between the second light intensity data collected currently and the light intensity data range of the standard flicker pattern is less than a difference between the second light intensity data collected previously and the light intensity data range of the standard flicker pattern, if yes, increasing or decreasing the to-be-adjusted common electrode voltage currently applied to the display module by the first step value in a manner identical to the previous adjustment, and if not, increasing or decreasing the to-be-adjusted common electrode voltage currently applied to the display module by the first step value in a manner contrary to the previous adjustment; and when the second light intensity data collected currently is located within the light intensity data range of the standard flicker pattern, determining the to-be-adjusted common electrode voltage currently applied to the display module as the reference common electrode voltage.

6 . The method according to claim 1 , wherein the step of plotting the gamma curve in accordance with the first light intensity data comprises:
acquiring maximum light intensity data and minimum light intensity data when the display module displays a maximum grayscale testing pattern and a minimum grayscale testing pattern; acquiring a vertical coordinate data of the testing gamma curve by the following equation: the vertical coordinate data =the minimum light intensity data+(the maximum light intensity data−the minimum light intensity data)*(a grayscale of a current grayscale testing pattern/a maximum grayscale corresponding to the maximum grayscale testing pattern)̂γ, wherein γ represents the gamma value of the standard gamma curve; and plotting the testing gamma curve in accordance with the Y-axis coordinate data, an X-axis coordinate data of the gamma curve representing a grayscale value range of the display module.

7 . The method according to claim 1 , wherein the step of adjusting the to-be-adjusted gamma voltage currently applied to the display module comprises:
acquiring an abnormal grayscale corresponding to a point on the testing gamma curve that is not located within the acceptable range of the standard gamma curve; acquiring an abnormal to-be-adjusted gamma voltage corresponding to the abnormal grayscale; increasing or decreasing the abnormal to-be-adjusted gamma voltage by a second step value, to obtain a new to-be-adjusted gamma voltage; collecting the first light intensity data when the display module displays the grayscale testing pattern after the reference common electrode voltage and the new to-be-adjusted gamma voltage are applied; plotting the testing gamma curve in accordance with the first light intensity data collected currently; judging whether or not the testing gamma curve plotted currently is located wit

Assignees

• Boe Technology Group Co Ltd
• Hefei Boe Optoelectronics Tech
• Hefei Boe Optoelectronics Tech

Inventors

• Zheng Liangliang
• He Jian
• Jin Tingting
• Huang Jiacheng

Classifications

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title

• G09G3/3648 Primary

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title

• G09G3/3696 Primary

  Generation of voltages supplied to electrode drivers · CPC title

• G09G3/3688

  suitable for active matrices only · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title