Display apparatus, counter substrate of display apparatus, method of fabricating display apparatus

1. A display apparatus having a plurality of subpixels, comprising:

an array substrate and a counter substrate facing the array substrate;

wherein the counter substrate comprises a base substrate;

an optical compensation device on the base substrate configured to adjust light emitting brightness values of the plurality of subpixels to target brightness values respectively, the optical compensation device comprising a plurality of photosensors configured to respectively detect light emitting brightness values of the plurality of subpixels; and

a plurality of light shielding walls on the base substrate;

wherein a respective one of the plurality of light shielding walls is configured to at least partially shield a lateral side of a respective one of the plurality of photosensors from light emitted from adjacent subpixels;

wherein a respective one of the plurality of photosensors comprises:

a first electrode on the base substrate;

a light detecting unit on a side of the first electrode away from the base substrate; and

a second electrode, which is substantially transparent, on a side of the light detecting unit away from the first electrode;

wherein the respective one of the plurality of light shielding walls is configured to at least partially shield a lateral side of the light detecting unit of the respective one of the plurality of photosensors from light emitted from the adjacent subpixels; and

a side of the respective one of the plurality of light shielding walls closer to the base substrate is in direct contact with the first electrode of the respective one of the plurality of photosensors.

2. The display apparatus of claim 1 , wherein the counter substrate further comprises a plurality of thin film transistors on the base substrate and respectively in the plurality of subpixels;

a respective one of the plurality of thin film transistors comprises a source electrode; and

the first electrode is electrically connected to the source electrode.

3. The display apparatus of claim 1 , wherein the first electrode and the source electrode are parts of a unitary electrode; and

the side of the respective one of the plurality of light shielding walls closer to the base substrate is in direct contact with the unitary electrode.

4. The display apparatus of claim 1 , wherein a relative height of a side of the respective one of the plurality of light shielding walls away from the base substrate with respect to the base substrate is greater than a relative height of a side of the second electrode of the respective one of the plurality of photosensors away from the base substrate with respect to the base substrate.

5. The display apparatus of claim 1 , wherein a relative height of the side of the respective one of the plurality of light shielding walls away from the base substrate with respect to the side of the second electrode of the respective one of the plurality of photosensors away from the base substrate is in a range of 2 μm to 20 μm.

6. The display apparatus of claim 1 , wherein the array substrate comprises a plurality of light emitting elements respectively in the plurality of subpixels;

an orthographic projection of the respective one of the light emitting elements on the counter substrate covers an orthographic projection of the respective one of the plurality of photosensors on the counter substrate; and

the side of the second electrode of the respective one of the plurality of photosensors away from the base substrate is facing the respective one of the plurality of light emitting elements.

7. The display apparatus of claim 1 , wherein the plurality of light shielding walls comprises a metal material; and

a respective one of the plurality of light shieling walls is configured to reflect light emitted from a respective one of the subpixels to the respective one of the plurality of photosensors.

8. The display apparatus of claim 1 , wherein the plurality of light shielding walls comprises a black resin material.

9. The display apparatus of claim 1 , wherein the respective one of the plurality of light shielding walls substantially surrounds an area in the counter substrate corresponding to a respective one of the plurality of subpixels.

10. The display apparatus of claim 1 , wherein the respective one of the plurality of light shielding walls substantially surrounds a perimeter of the light detecting unit of the respective one of the plurality of photosensors; and

transistors are outside an area surrounded by the respective one of the plurality of light shielding walls.

11. The display apparatus of claim 1 , wherein the light detecting unit of the respective one of the plurality of photosensors is a PIN photodiode.

12. The display apparatus of claim 1 , wherein the respective one of the plurality of light shielding walls is configured to completely shield the lateral side of the respective one of the plurality of photosensors from light emitted from adjacent subpixels.

13. A counter substrate of a display apparatus having a plurality of subpixels, comprising:

a base substrate;

a plurality of photosensors on the base substrate configured to respectively detect light emitting brightness values of the plurality of subpixels; and

a plurality of light shielding walls on the base substrate;

wherein a respective one of the plurality of light shielding walls is configured to at least partially shield a lateral side of a respective one of the plurality of photosensors from light emitted from adjacent subpixels;

wherein a respective one of the plurality of photosensors comprises:

a first electrode on the base substrate;

a light detecting unit on a side of the first electrode away from the base substrate; and

a second electrode, which is substantially transparent, on a side of the light detecting unit away from the first electrode;

wherein the respective one of the plurality of light shielding walls is configured to at least partially shield a lateral side of the light detecting unit of the respective one of the plurality of photosensors from light emitted from the adjacent subpixels; and

a side of the respective one of the plurality of light shielding walls closer to the base substrate is in direct contact with the first electrode of the respective one of the plurality of photosensors.

14. The counter substrate of claim 13 , wherein the counter substrate further comprises a plurality of thin film transistors on the base substrate and respectively in the plurality of subpixels;

a respective one of the plurality of thin film transistors comprises a source electrode; and

the first electrode is electrically connected to the source electrode.

15. The counter substrate of claim 13 , wherein the first electrode and the source electrode are parts of a unitary electrode; and

the side of the respective one of the plurality of light shielding walls closer to the base substrate is in direct contact with the unitary electrode.

16. The counter substrate of claim 13 , wherein a relative height of a side of the respective one of the plurality of light shielding walls away from the base substrate with respect to the base substrate is greater than a relative height of a side of the second electrode of the respective one of the plurality of photosensors away from the base substrate with respect to the base substrate.

17. A method of fabricating a display apparatus having a plurality of subpixels, comprising:

forming an optical compensation device on a base substrate;

forming a plurality of light shielding walls on the base substrate, thereby obtaining a counter substrate;

assembling the counter substrate and an array substrate together;

wherein the optical compensation device is formed to comprises a plurality of photosensors configured to respectively detect light emitting brightness values of the plurality of subpixels; and

a respective one of the plurality of light shielding walls configured to at least partially shield a lateral side of a respective one of the plurality of photosensors from light emitted from adjacent subpixels;

wherein forming a respective one of the plurality of photosensors comprises:

forming a first electrode on the base substrate;

forming a light detecting unit on a side of the first electrode away from the base substrate; and

forming a second electrode, which is substantially transparent, on a side of the light detecting unit away from the first electrode;

wherein the respective one of the plurality of light shielding walls is configured to at least partially shield a lateral side of the light detecting unit of the respective one of the plurality of photosensors from light emitted from the adjacent subpixels; and

a side of the respective one of the plurality of light shielding walls closer to the base substrate is in direct contact with the first electrode of the respective one of the plurality of photosensors.

18. The method of claim 17 , wherein forming a respective one of the plurality of light shielding walls comprises forming a first electrode of the respective one of the plurality of photosensors on the base substrate;

forming a photoresist layer on a side of the first electrode of the respective one of the plurality of photosensors away from the base substrate;

patterning the photoresist layer to form a via extending through the photoresist layer;

forming the respective one of the plurality of light shielding walls in the via using an electroforming process; and

removing the photoresist layer.