Display substrate, display panel and display assembly

1. A display substrate, comprising:

a plurality of sub-pixel regions at a first base substrate, each of the plurality of sub-pixel regions including a light-blocking region and aperture regions located at opposing sides of the light-blocking region; and

a first transparent electrode and a second transparent electrode within each of the plurality of sub-pixel regions, configured to drive a liquid crystal layer;

wherein the first transparent electrode comprises a first electrode unit located inside the light-blocking region and including a plurality of first sub-electrodes parallel to each other, wherein each of the plurality of first sub-electrodes are separated from two adjacent first sub-electrodes by a separation distance;

wherein the separation distance between two adjacent first sub-electrodes nearest to a center line of the light-blocking region is smaller than the separation distance between two adjacent first sub-electrodes nearest to an edge of the light-blocking region;

wherein the first transparent electrode further comprises a second electrode unit located inside the aperture regions and including a plurality of second sub-electrodes parallel to each other; and

wherein a pitch of the first sub-electrodes increases from the center line of the light-blocking region towards the edge of the light-blocking region and a pitch of the second sub-electrodes inside the aperture regions is uniform.

2. The display substrate of claim 1 , wherein:

the plurality of first sub-electrodes are divided into two groups; and

the two groups are mirrored and symmetric to one another about the center line of the light-blocking region.

3. The display substrate of claim 1 or 2 , wherein:

the light-blocking region includes one central region and at least two periphery regions that are located on opposing sides of the central region;

the separation distance between two adjacent first sub-electrodes inside the central region is uniform;

the separation distance between two adjacent first sub-electrodes inside each one of the at least two periphery regions is uniform; and

the separation distance between two adjacent first sub-electrodes inside the central region is smaller than the separation distance inside each one of the at least two periphery regions.

4. The display substrate of claim 3 , wherein:

the at least two periphery regions comprise at least four periphery regions, wherein the at least four periphery regions are arranged so as to mirror symmetrically about the central region; and

the separation distance between two adjacent first sub-electrodes increases along a direction, which is parallel to a surface of the first base substrate, away from the central region.

5. The display substrate of claim 1 , wherein:

the separation distance between two adjacent first sub-electrodes increases along a direction, which is parallel to a surface of the first base substrate, away from the center line of the light-blocking region.

6. The display substrate of claim 1 , further comprising:

a light extraction structure arranged inside the light-blocking region, wherein the light extraction structure is configured to fetch the light transmitted by a total reflection within a backlight source.

7. The display substrate of claim 6 , wherein the light extraction structure comprises light extraction gratings.

8. The display substrate of claim 7 , wherein:

the light extraction gratings are arranged on the first base substrate;

the second transparent electrode is on a side of the light extraction gratings away from the first base substrate; and

the first transparent electrode is on a side of the second transparent electrode away from the first base substrate.

9. The display substrate of claim 1 , wherein one of the first transparent electrode and the second transparent electrode is a pixel electrode, and the other one is a common electrode.

10. The display substrate of claim 1 , wherein the pitch of the first sub-electrodes increases progressively from the center line of the light-blocking region towards the edge of the light-blocking region.

11. The display substrate of claim 10 , wherein the pitch ranges between 3 μm plus half a size of a first sub-electrode among the first sub-electrodes adjacent to the center line plus half a size of a second sub-electrode neighboring the first sub-electrode, and 7 μm plus half a size of a third sub-electrode among the first sub-electrodes adjacent to the edge plus half a size of a fourth sub-electrode neighboring the third sub-electrode.

12. A display panel, comprising:

the display substrate of anyone of claims 1 - 11 ;

a color film substrate on a side of the first transparent electrode away from the second transparent electrode;

the liquid crystal layer between the display substrate and the color film substrate.

13. The display panel of claim 12 , wherein:

the color film substrate comprises a second base substrate and a black matrix arranged over the second base substrate;

the black matrix defines a plurality of sub-pixel regions of the color film substrate; the sub-pixel regions of the color film substrate correspond to the sub-pixel regions of the display substrate in a one-to-one correspondence;

each sub-pixel region of the color film substrate comprises a light-blocking region and aperture regions located at the opposite sides of the light-blocking region;

the light-blocking regions of the color film substrate correspond to the light-blocking regions of the display substrate in a one-to-one correspondence;

the aperture regions of the color film substrate correspond to the aperture regions of the display substrate one-to-one; and

light-blocking patterns are disposed inside the light-blocking regions of the color film substrate.

14. The display panel of claim 12 , wherein: an orthographic projection of the sub-pixel regions of the color film substrate on the first substrate coincides with an orthographic projection of the sub-pixel regions of the display substrate on the first substrate.

15. The display panel of claim 12 , wherein: the light-blocking patterns and the black matrix are at a same layer and made of a same material.

16. The display panel of claim 15 , the light-blocking patterns cross through at least one sub-pixel region of the color film substrate.

17. The display panel of claim 12 , wherein:

the light-blocking regions of the color film substrate and the aperture regions of the color film substrate are in a column direction, the light-blocking patterns in the sub-pixel regions of the color film substrate being of same row are connected; or

the light-blocking regions of the color film substrate and the aperture regions of the color film substrate are in a row direction, the light-blocking patterns in the sub-pixel regions of the color film substrate being of same column are connected.

18. A display assembly comprising:

the display panel in accordance with any one of claims 12 - 17 ; and

a collimated light source, wherein,

the collimated light source comprises a light source and a light-guide plate, the light-guide plate comprises a light-emitting side and a light incident side arranged opposite the light-emitting side, configured to enable light reaching the light-guide plate to be transmitted through the light-incident side;

the display panel comprises a plurality of light extraction structures; and

the plurality of light extraction structures are arranged on the light-emitting side of the light-guide plate so as to fetch the light transmitted by a total reflection within the light-guide plate.

19. The display assembly of claim 18 , wherein the light-guide plate and the first base substrate of the display substrate have an integrated structure.