Grayscale value setting method for liquid crystal panel and liquid crystal display

Patent metadata

Field	Value
Publication number	US-9734748-B2
Application number	US-201414387009-A
Country	US
Kind code	B2
Filing date	Aug 22, 2014
Priority date	Aug 18, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A grayscale value setting method for a liquid crystal panel is disclosed which includes obtaining actual luminance values of each grayscale G of the liquid crystal panel at front and slant view angles; dividing actual luminance values according to the area ratio of the main pixel area M and the sub pixel area S, and establishing corresponding relationships between the grayscale and the actual luminance values in the main and the sub pixel areas; calculating theoretical luminance values of each grayscale; setting a grayscale combination, such that a sum of difference values between actual and theoretical luminance values of the front and slant view angle are minimal; and repeating the last step to obtain grayscales respectively input to the main pixel and the sub pixel areas at all of grayscales of the liquid crystal panel. A liquid crystal display setting a grayscale value using the above method is also disclosed.

First claim

The invention claimed is:

1. A grayscale value setting method for a liquid crystal panel comprising a plurality of pixel units, each of which comprises a main pixel area M and a sub pixel area S, wherein, an area ratio of the main pixel area M and the sub pixel area S is a:b, the method comprising:
S 101 obtaining an actual luminance value Lvα of each grayscale G of the liquid crystal panel at a front view angle α;
S 102 obtaining an actual luminance value Lvβ of each grayscale G of the liquid crystal panel at a slant view angle β;
S 103 according to the area ratio of a:b of the main pixel area M and the sub pixel area S, dividing the actual luminance values Lvα and Lvβ according to following equations:
LvMα:LvSα=a:b,LvMα+LvSα=Lvα;
LvMβ:LvSβ=a:b,LvMβ+LvSβ=Lvβ;

wherein, actual luminance values LvMα and LvMβ of each grayscale G of the main pixel area M at the front view angle α and the slant view angle β are obtained, respectively; actual luminance values LvSα and LvSβ of each grayscale G of the sub pixel area S at the front view angle α and the slant view angle β are obtained, respectively;
S 104 calculating theoretical luminance values LvGα and LvGβ of each grayscale G of the liquid crystal panel at the front view angle α and the slant view angle β according to actual luminance values Lvα(max) and Lvβ(max) of a highest grayscale max obtained in steps S 101 and S 102 , in conjunction with equations:

gamma
⁡

(
γ
)

=

2.2
⁢

⁢
and
⁢

⁢

(

G
max

)

γ

=

LvG

Lv
⁡

(
max
)

;

S 105 as for a grayscale Gx in the pixel unit, assuming that grayscales input to the main pixel area M and the sub pixel area S are Gmx and Gsx, respectively, obtaining actual luminance values LvMxα, LvMxβ, LvSxα and LvSxβ according to a result of S 103 , and obtaining theoretical luminance values LvGxα and LvGxβ according to a result of S 104 ; and calculating following equations:
Δ1= LvMxα+LvSxα−LvGxα;

Δ2= LvMxβ+LvSxβ−LvGxβ;

y=Δ 1 2 +Δ2 2 ;

and judging:
Gmx≧Gm ( x− 1), Gsx≧Gs ( x− 1);
wherein, when the condition Gmx≧Gm(x−1), Gsx≧Gs(x−1) is satisfied and y is minimal, corresponding grayscales Gmx and Gsx are set to be grayscales respectively input to the main pixel area M and the sub pixel area S when the pixel unit is at the grayscale Gx; and
S 106 repeating S 105 with respect to each grayscale G of the pixel unit, so as to obtain grayscales respectively input to the main pixel area M and the sub pixel area S at all of grayscales of the liquid crystal panel.

2. The grayscale value setting method for the liquid crystal panel in claim 1 , wherein the front view angle α is 0°, and the slant view angle β is 30-80°.

3. The grayscale value setting method for the liquid crystal panel in claim 2 , wherein the slant view angle β is 60°.

4. The grayscale value setting method for the liquid crystal panel in claim 1 , wherein grayscales of the liquid crystal panel include 256 grayscales from 0-255, wherein the highest grayscale max is grayscale 255.

5. The grayscale value setting method for the liquid crystal panel in claim 2 , wherein grayscales of the liquid crystal panel include 256 grayscales from 0-255, wherein the highest grayscale max is grayscale 255.

6. The grayscale value setting method for the liquid crystal panel in claim 1 , wherein the obtaining of the actual luminance value Lvα of each grayscale G of the liquid crystal panel at the front view angle α comprises:
obtaining a gamma curve of the liquid crystal panel at the front view angle α; and
determining the actual luminance value Lvα according to the gamma curve.

7. The grayscale value setting method for the liquid crystal panel in claim 1 , wherein the obtaining of the actual luminance value Lvα of each grayscale G of the liquid crystal panel at the slant view angle α comprises:
obtaining a gamma curve of the liquid crystal panel at the slant view angle β; and
determining the actual luminance value Lvα according to the gamma curve.

8. The grayscale value setting method for the liquid crystal panel in claim 1 , wherein, after step S 106 , a Gm-Lv relationship curve between the grayscale and the luminance of the main pixel area M and a Gs-Lv relationship curve between the grayscale and the luminance of the sub pixel area S are obtained, and a singular point appearing in the Gm-Lv relationship curve and the Gs-Lv relationship curve is processed by adopting a Locally weighted regression scatter plot smoothing.

9. The grayscale value setting method for the liquid crystal panel in claim 1 , wherein, after step S 106 , a Gm-Lv relationship curve between the grayscale and the luminance of the main pixel area M and a Gs-Lv relationship curve between the grayscale and the luminance of the sub pixel area S are obtained, and a singular point appearing in the Gm-Lv relationship curve and the Gs-Lv relationship curve is processed by adopting a power function fitting process.

10. The grayscale value setting method for the liquid crystal panel in claim 9 , wherein an expression of the power function is: f=m*x^n+k.

11. A liquid crystal display comprising backlight module and a liquid crystal panel which are oppositely disposed, wherein the backlight module provide a display light source to the liquid crystal panel so that the liquid crystal panel displays an image, the liquid crystal panel includes a plurality of pixel units, each pixel unit includes a main pixel area M and a sub pixel area S, and the area ratio of the main pixel area M and the sub pixel area S is a:b, wherein a grayscale value setting method of the liquid crystal panel comprises:
S 101 obtaining an actual luminance value Lvα of each grayscale G of the liquid crystal panel at a front view angle α;
S 102 obtaining an actual luminance value Lvβ of each grayscale G of the liquid crystal panel at a slant view angle β;
S 103 according to the area ratio of a:b of the main pixel area M and the sub pixel area S, dividing the actual luminance values Lvα and Lvβ according to following equations:
LvMα:LvSα=a:b,LvMα+LvSα=Lvα;
LvMβ:LvSβ=a:b,LvMβ+LvSβ=Lvβ;

wherein, actual luminance values LvMα and LvMβ of each grayscale G of the main pixel area M at the front view angle α and the slant view angle β are obtained, respectively; actual luminance values LvSα and LvSβ of each grayscale G of the sub pixel area S at the front view angle α and the slant view angle β are obtained, respectively;
S 104 calculati

Assignees

• Shenzhen China Star Optoelect

Inventors

• Chen Lixuan

Classifications

• G09G3/3607 Primary

  for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127) · CPC title

• G09G2320/028

  by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction · CPC title

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G2320/068

  for control of viewing angle adjustment · CPC title

• G09G2320/0673

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