Display substrate and display device

1. A display device, comprising:

a display panel; and

a driver configured to drive the display panel;

wherein the display panel comprises a display area comprising:

a first display sub-area; and

a second display sub-area;

wherein a distribution density of pixels in the first display sub-area is higher than a distribution density of pixels in the second display sub-area;

the second display sub-area comprises:

a plurality of third pixel elements;

wherein the third pixel element comprises:

a first sub-pixel, a second sub-pixel, and a third sub-pixel adjacent to each other;

the first display sub-area comprises:

a plurality of first pixel elements; and

a plurality of second pixel elements;

wherein the first pixel elements and the second pixel elements are arranged alternately in a row direction;

each of the first pixel elements comprises:

a first sub-pixel; and

a second sub-pixel;

wherein the first sub-pixel and the second sub-pixel in the each first pixel element are arranged in a same row;

each of the second pixel elements comprises:

a third sub-pixel; and

a second sub-pixel;

wherein the third sub-pixel and the second sub-pixel in the each second pixel elements are arranged in a same row; and

for the first pixel element and the second pixel element adjacent in the row direction, the second sub-pixel in the first pixel element is not immediately adjacent to the second sub-pixel in the second pixel element.

2. The display device according to claim 1 , wherein the first display sub-area and the second display sub-area form a consecutive display area; and

the second display sub-area is totally surrounded by the first display sub-area; or

at least a part of sides of the second display sub-area coincide with at least a part of sides of the display area, and the other sides of the second display sub-area are surrounded by the first display sub-area.

3. The display device according to claim 2 , wherein:

the display area is substantially rectangular;

a shape of the second display sub-area is substantially one of:

a round shape,

a drop shape,

a rectangle, or

a trapezoid.

4. The display device according to claim 1 , wherein an area of the second display sub-area is smaller than an area of the first display sub-area.

5. The display device according to claim 1 , wherein:

the sub-pixels in the second display sub-area are in same rows as a part of the sub-pixels in the first display sub-area, and/or

the sub-pixels in the second display sub-area are in same columns as a part of the sub-pixels in the first display sub-area.

6. The display device according to claim 1 , wherein:

a light-emitting area of a first sub-pixel in the second display sub-area is larger than or substantially equal to a light-emitting area of a first sub-pixel in the first display sub-area;

a light-emitting area of a second sub-pixel in the second display sub-area is larger than or substantially equal to a light-emitting area of a second sub-pixel in the first display sub-area; and

a light-emitting area of a third sub-pixel in the second display sub-area is larger than or substantially equal to a light-emitting area of a third sub-pixel in the first display sub-area.

7. The display device according to claim 1 , wherein the plurality of third pixel elements are arranged in a matrix or in a checkerboard pattern in the second display sub-area.

8. The display device according to claim 1 , wherein in the third pixel element in the second display sub-area, the first sub-pixel and the third sub-pixel are arranged in a same row, and the second sub-pixel is in an adjacent row to a row of the first sub-pixel and the third sub-pixel.

9. The display device according to claim 8 , wherein in a same third pixel element, an orthographic projection of a center of the second sub-pixel on a line connecting a center of the first sub-pixel with a center of the third sub-pixel lies between the center of the first sub-pixel and the center of the third sub-pixel.

10. The display device according to claim 1 , wherein the first sub-pixel, the second sub-pixel, and the third sub-pixel in the third pixel element in the second display sub-area are arranged successively in a same row; and

wherein in the second display sub-area, the sub-pixels are arranged as one of the followings:

in the second display sub-area, the sub-pixels in two third pixel elements adjacent in a row direction are arranged in same order, and the sub-pixels in two third pixel elements adjacent in the column direction are arranged in opposite orders; or

in the second display sub-area, the sub-pixels in each of the third pixel elements are arranged in a same order; or

in the second display sub-area, the sub-pixels in each of the third pixel elements in a same column are arranged in a same order, and the sub-pixels in the third pixel elements in two adjacent columns are arranged in opposite orders.

11. The display device according to claim 1 , wherein the first sub-pixel and the second sub-pixel in the first pixel element are arranged in a same row, and the second sub-pixel and the third sub-pixel in the second pixel element are arranged in different rows and different columns; and

the first pixel element and the second pixel element adjacent in the column direction are a pixel group, and in a same pixel group, the second sub-pixel in the first pixel element and the second sub-pixel in the second pixel element are arranged in a same column.

12. The display device according to claim 11 , wherein in the first display sub-area, a light-emitting area of a second sub-pixel is smaller than a light-emitting area of a first sub-pixel, and a light-emitting area of a second sub-pixel is smaller than a light-emitting area of a third sub-pixel; and

two second sub-pixels in the same pixel group are arranged symmetric in a row direction.

13. The display device according to claim 12 , wherein in the pixel group, a shape of the first sub-pixel is the same as a shape of the third sub-pixel, and a shape of a combination of two second sub-pixels is substantially the same as the shape of the first sub-pixel.

14. The display device according to claim 1 , wherein in at least one of the first display sub-area and the second display sub-area, one type of the sub-pixels among the first sub-pixels and the third sub-pixels have the substantial same shape, and the shape of the second sub-pixel in the second display sub-area is substantially the same as the shape of the second sub-pixel in the first display sub-area;

or

in at least one of the first display sub-area and the second display sub-area, a shape of the first sub-pixel, a shape of the second sub-pixel, and a shape of the third sub-pixel are substantially the same.

15. The display device according to claim 1 , wherein the distribution density of pixels in the second display sub-area is no lower than ¼ of the distribution density of pixels in the first display sub-area.

16. The display device according to claim 1 , wherein a distribution density of pixels in a display sub-area is determined by:

ρ

=

x

2

+

y

2

S

wherein ρ represents the distribution density of pixels in the display sub-area, x represents a quantity of display pixels in the row direction in the display sub-area, y represents a quantity of of display pixels in a column direction in the display sub-area, and S represents an area of the display sub-area.

17. The display device according to claim 1 , wherein the display further comprises:

a transition display sub-area between the first display sub-area and the second display sub-area;

wherein the first display sub-area, the transition display sub-area, and the second display sub-area form a consecutive display area;

a distribution density of pixels in the transition display sub-area is lower than the distribution density of pixels in the first display sub-area, and the distribution density of pixels in the transition display sub-area is higher than the distribution density of pixels in the second display sub-area; and

the transition display sub-urea comprises:

a plurality of fourth pixel elements;

wherein the fourth pixel element comprises:

a first sub-pixel, a second sub-pixel, and a third sub-pixel adjacent to each other.

18. The display device according to claim 1 , wherein the driver is configured:

to receive raw image data;

for each sub-pixel in the first display sub-area, to determine a target grayscale value of the sub-pixel according to an initial grayscale value of a sub-pixel in the raw image data, corresponding to the sub-pixel in the first display sub-area;

for each sub-pixel in the second display sub-area, to determine a target grayscale value of the sub-pixel according to a light-emitting area of the sub-pixel, the distribution density of pixels in the second display sub-area, and an initial grayscale value of a sub-pixel in the raw image data, corresponding to an area comprising the sub-pixel in the second display sub-area; and

to drive the sub-pixels in the display panel to display at their target grayscale values.

19. The display device according to claim 18 , wherein the driver is configured for:

determining a target grayscale value X corresponding to a first sub-pixel in an equation of

X

=

(

x

1

Gamma

+

x

2

Gamma

2

)

1

Gamma

,

wherein Gamma represents a gamma value of the display panel, and x 1 and x z are initial grayscale values of two first sub-pixels in the raw image data, which correspond to the first sub-pixel in the first display sub-area;

determining a target grayscale value Y of a second sub-pixel as an initial grayscale value y of a second sub-pixel in the raw image data, corresponding to the second sub-pixel in the first display sub-area; and

determining a target grayscale value Z corresponding to a third sub-pixel in an equation of

Z

=

(

z

1

Gamma

+

z

2

Gamma

2

)

1

Gamma

,

wherein z 1 and z 2 are initial grayscale values of two third sub-pixels in the raw image data, which correspond to the third sub-pixel in the first display sub-area.

20. The display device according to claim 18 , wherein the driver is configured for:

determining the target grayscale value X corresponding to the sub-pixel in an equation of

X

=

k

*

s

*

ρ

(

x

1

Gamma

+

x

2

Gamma

+

…

+

x

n

Gamma

n

)

1

Gamma

,

wherein n is any integer ranging from 1 to N, N is the number of sub-pixels in the raw image data, which correspond to the sub-pixel in the second display sub-area, Gamma represents a gamma value of the display panel, s represents a ratio of a light-emitting area of the sub-pixel in the first display sub-area to a light-emitting area of the sub-pixel in the second display sub-area, ρ represents a ratio of the distribution density of pixels in the first display sub-area to the distribution density of pixels in the second display sub-area, k is an error adjustment coefficient, and x n is an initial grayscale value of a n-th sub-pixel in the raw image data, corresponding to the sub-pixel in the second display sub-area.