White balance adjustment method for a display device

Patent metadata

Field	Value
Publication number	US-9414036-B2
Application number	US-201414360802-A
Country	US
Kind code	B2
Filing date	Apr 18, 2014
Priority date	Apr 15, 2014
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A white balance adjustment method for a display, the method including acquiring spectrum stimulus values of q gray scales of red, green, blue and white of a display panel of a tested display; determining spectrum stimulus value brightness of white and green, and performing interpolation segmenting on brightness of white and green; normalizing brightness of white and green; acquiring an ideal brightness normalized value of white and an ideal brightness normalized value of green; comparing the normalized value for brightness white and the ideal brightness normalized value corresponding to the white and the normalized value for brightness of green and the ideal brightness normalized value corresponding to the green respectively, based on the closest principle, and determining optimal gray scales of white and green; determining a target chromaticity, and changing the gray scales of red and blue, acquiring a RGBW combination which is closest to the target chromaticity.

First claim

What is claimed is:

1. A white balance adjustment method for a display device, comprising:
1) acquiring RX q , RY q , RZ q which are spectrum stimulus values of q gray scale of red of a display panel of a tested displayed device, GX q , GY q , GZ q which are spectrum stimulus values of q gray scale of green of the display panel of the tested display device, BX q , BY q , BZ q which are spectrum stimulus values of q gray scale of blue of the display panel of the tested display device, and WX q , WY q , WZ q which are spectrum stimulus values of q gray scale of white of the display panel of the tested display device, wherein q is a gray level and is an integer, X, Y, Z are spectrum stimulus values of the display panel of the tested display device;
2) determining WY q which is spectrum stimulus value of q gray scale of white of the display panel of the tested display device as brightness of q gray scale of white; and determining GY q which is spectrum stimulus value of q gray scale of green of the display panel of the tested display device as brightness of q gray scale of green;
3) dividing WY q which is brightness of q gray scale of white of the display panel of the tested display device, into i segments between q gray scale and q−1 gray scale by using an interpolation method; and dividing GY q which is brightness of q gray scale of green of the display panel of the tested display device, into i segments between q gray scale and q−1 gray scale by using the interpolation method, wherein i is an integer that is not less than 2;
4) normalizing values from WY 0 which is brightness of 0 gray scale to WY max which is brightness of max gray scale, which have been divided, as WN 0 to WN max , on the basis of WY max which is brightness of max gray scale of white of the display panel of the tested display device and WY 0 which is brightness of 0 gray scale; and normalizing values from GY 0 which is brightness of 0 gray scale to GY max which is brightness of max gray scale, which have been divided, as GN 0 to GN max , on the basis of GY max which is brightness of max gray scale of green of the display panel of the tested display device and GY 0 which is brightness of 0 gray scale, wherein the max gray scale means the maximum gray scale;
5) acquiring WM q which is an ideal brightness normalized value of q gray scale of white of the display panel of the tested display device; and acquiring GM q which is an ideal brightness normalized value of q gray scale of green of the display panel of the tested display device;
6) comparing the ideal brightness normalized value WM q and each of the values from WY 0 which is brightness of 0 gray scale to WY max which is brightness of max gray scale, which have been divided, determining an optimal gray scale of white of the display panel of the tested display device, which corresponds to q gray scale, based on a closest principle; and comparing the ideal brightness normalized value GM q and each of the values from GY 0 which is brightness of 0 gray scale to GY max which is brightness of max gray scale, which have been divided, determining an optimal gray scale of green of the display panel of the tested display device, which corresponds to q gray scale, based on the closest principle; and
7) determining a target chromaticity, changing the gray scales of red and blue of the display panel of the tested display device, acquiring different RGBW combinations, measuring a chromaticities of the different RGBW combinations, and determining a RGBW combination which is closest to the target chromaticity based on the measured chromaticities of the different RGBW combinations.

2. The method of claim 1 , wherein, in the step 3), WY q which is brightness of q gray scale of white of the display panel of the tested display device is divided between q gray scale and q−1 gray scale into:

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Assignees

• Shenzhen China Star Optoelect

Inventors

• Wu Jinjun
• Ning Chao

Classifications

• H04N9/73 Primary

  Colour balance circuits, e.g. white balance circuits or colour temperature control (camera processing pipelines for colour balance H04N23/88) · CPC title

• G09G3/3208

  organic, e.g. using organic light-emitting diodes [OLED] · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G01J3/505

  measuring the colour produced by lighting fixtures other than screens, monitors, displays or CRTs · CPC title

• G09G3/2074

  using sub-pixels · CPC title