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

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 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.

12. The liquid crystal display in claim 11 , wherein the front view angle α is 0°, and the slant view angle β is 30-80°.

13. The liquid crystal display in claim 12 , wherein the slant view angle β is 60°.

14. The liquid crystal display in claim 11 , wherein grayscales of the liquid crystal panel includes 256 grayscales from 0-255, wherein the highest grayscale max is grayscale 255.

15. The liquid crystal display in claim 12 , wherein grayscales of the liquid crystal panel includes 256 grayscales from 0-255, wherein the highest grayscale max is grayscale 255.

16. The liquid crystal display in claim 11 , 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.

17. The liquid crystal display in claim 11 , wherein the obtaining of the actual luminance value Lvβ of each grayscale G of the liquid crystal panel at the slant view angle β comprises:

obtaining the 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.

18. The liquid crystal display in claim 11 , wherein after completing 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, 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.

19. The liquid crystal display in claim 11 , wherein, after completing 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, 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.

20. The liquid crystal display in claim 19 , wherein an expression of the power function is: f=m*x^n+k.