Display substrate, method of fabricating the same, and display device

1. A display panel, comprising:

a substrate;

a first groove and a second groove formed on the substrate, wherein the first groove and the second groove are formed by photoresist and bottom surfaces of the grooves exceed a height of a pixel area on the substrate, and wherein a spacer block is provided in the bottom of the first groove;

an opposite substrate; and

a spacer structure formed on the opposite substrate corresponding to the grooves formed on the substrate, wherein the spacer structure comprises a main spacer received in the first groove with the spacer block therein and a secondary spacer received in the second groove, to allow the secondary spacer not to contact the substrate when the main spacer contacts the spacer block,

wherein the second groove comprises a plurality of grooves with different heights.

2. The display panel according to claim 1 , wherein the substrate is an array substrate, and wherein the first groove is provided on a distribution area of gate lines on the array substrate.

3. The display panel according to claim 1 , wherein the substrate is an array substrate, and wherein the second groove is provided on a distribution area of gate lines and a corresponding area of a thin film transistor on the array substrate.

4. The display panel according to claim 1 , wherein the main spacer has a height equal to that of the secondary spacer, and the first groove has a depth less than that of the second groove; or, the main spacer has a height greater than that of the secondary spacer, and the first groove has a depth equal to that of the second groove.

5. The display panel according to claim 1 , wherein, when the spacer structure is placed in the grooves, a gap is provided between the spacer structure and a wall of the grooves.

6. The display panel according to claim 1 , wherein the spacer structure is a columnar structure with a wide upper part and a narrow lower part, and each of the grooves that corresponds to the spacer structure is a structure with a wide upper part and a narrow lower part.

7. The display panel according to claim 1 , wherein the photoresist comprises a photoresist used in a last photolithography process in a preparing process of the substrate.

8. The display panel according to claim 7 , wherein the substrate is an array substrate, and wherein the grooves are provided above a top transparent conductive layer of the array substrate.

9. A display device, comprising a display panel, wherein the display panel comprises:

a substrate;

a first groove and a second groove formed on the substrate, wherein the first groove and the second groove are formed by photoresist and bottom surfaces of the grooves exceed a height of a pixel area on the substrate, and wherein a spacer block is provided in the bottom of the first groove;

an opposite substrate; and

a spacer structure formed on the opposite substrate corresponding to the grooves formed on the substrate, wherein the spacer structure comprises a main spacer received in the first groove with the spacer block therein and a secondary spacer received in the second groove, to allow the secondary spacer not to contact the substrate when the main spacer contacts the spacer block,

wherein the second groove comprises a plurality of grooves with different heights.

10. The display device according to claim 9 , wherein the substrate is an array substrate.

11. A method of fabricating a display panel, comprising:

forming a first groove and a second groove on a substrate by photoresist used in a photolithography process, wherein bottom surfaces of the grooves exceed a height of a pixel area on the substrate;

providing a spacer block in the first groove; and

forming a spacer structure on an opposite substrate corresponding to the grooves formed on the substrate, wherein the spacer structure comprises a main spacer to be received in the first groove with the spacer block therein and a secondary spacer to be received in the second groove, to allow the secondary spacer not to contact the substrate when the main spacer contacts the spacer block.

12. The method of fabricating the display panel according to claim 11 , further comprising:

in a last photolithography process of the substrate, forming the grooves synchronously by the photoresist used in the photolithography process.

13. The method of fabricating the display panel according to claim 12 , wherein the substrate is an array substrate, and in the last photolithography process of the array substrate for forming a transparent electrode, the grooves are formed synchronously by the photoresist via a half-tone mask process and an ashing process.

14. The method of fabricating the display panel according to claim 13 , further comprising curing the grooves after the grooves are formed.

15. The method of fabricating the display panel according to claim 12 , wherein the substrate is a color filter substrate and the grooves are provided above a top color filter layer.