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

• US 9,761,632 B2
• Filed: 11/18/2014
• Issued: 09/12/2017
• Est. Priority Date: 07/04/2014
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei Xinsheng Optoelectric Technology Co. Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Hefei Xinsheng Optoelectric Technology Co. Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Li, Bin, Lu, Xiangwan
• Primary Examiner(s): Hossain, Moazzam
• Assistant Examiner(s): Lu, Farun
• Application Number:
  US14/547,073
• Publication Number:
  US 20160005790A1
• Time in Patent Office: 1,029 Days
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/13396 Spacers having different sizes
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 2933/0058 relating to optical field-shaping elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/58 Optical field-shaping elements
• CPC Class Codes: H10K 50/8428 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/8723 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers

Abstract

Embodiments of the present invention disclose a display substrate and a method of manufacturing the same, and a display device comprising the display substrate. The display substrate comprises: a substrate; a black matrix layer and a color filter layer located on the substrate; and at least one main spacer and at least one secondary spacer located on the black matrix layer or the color filter layer and both having direct projections on the substrate within a region where the black matrix layer is located. A sum of thicknesses of portions of the black matrix layer and the color filter layer corresponding to each secondary spacer is smaller than that of portions of the black matrix layer and the color filter layer corresponding to each main spacer, so that a distance from a top end of the secondary spacer to the substrate is smaller than a distance from a top end of the main spacer to the substrate. As a result, a difference between the distance from the top end of the main spacer to the substrate and the distance from the top end of the secondary spacer to the substrate can be varied by adjusting a difference between the sum of thicknesses of the black matrix layer and the color filter layer directly below each main spacer and the sum of thicknesses of the black matrix layer and the color filter layer directly below each secondary spacer, thereby enabling the main spacer and the secondary spacer to provide a good effect of buffering an external force.

Claims

1. A display substrate, comprising:

a substrate;

a black matrix layer and a color filter layer located on the substrate; and

at least one main spacer and at least one secondary spacer located on the black matrix layer or the color filter layer and both having direct projections on the substrate within a region where the black matrix layer is located;

wherein, a sum of thicknesses of portions of the black matrix layer and the color filter layer corresponding to each secondary spacer is smaller than that of portions of the black matrix layer and the color filter layer corresponding to each main spacer, so that a distance from a top end of the main spacer to the substrate is larger than distances from top ends of other spacers located on the substrate to the substrate, and

wherein a height of the secondary spacer is equal to that of the main spacer, and the thickness of the portion of the color filter layer corresponding to the main spacer is larger than that of the portion of the color filter layer corresponding to the secondary spacer located adjacent to the main spacer.

2. The display substrate according to claim 1, wherein the thickness of the portion of the color filter layer corresponding to the secondary spacer is zero.

3. The display substrate according to claim 2, wherein the thickness of the portion of the black matrix layer corresponding to the secondary spacer is smaller than or equal to that of the portion of the black matrix layer corresponding to the main spacer.

4. A display device comprising the display substrate according to claim 1.

5. The display device according to claim 4, wherein the thickness of the portion of the color filter layer corresponding to the secondary spacer is zero.

6. The display device according to claim 5, wherein the thickness of the portion of the black matrix layer corresponding to the secondary spacer is smaller than or equal to that of the portion of the black matrix layer corresponding to the main spacer.

7. The display substrate according to claim 1, wherein the color filter layer comprises a plurality of color resistors, and wherein the at least one main spacer is located on two of the plurality of color resistors having different colors, and/or the at least one secondary spacer is located on another two of the plurality of color resistors having different colors.

8. A method of manufacturing a display substrate, comprising:

forming a black matrix layer and a color filter layer on a substrate; and

forming, over the substrate on which the black matrix layer and the color filter layer have been formed, at least one main spacer and at least one secondary spacer on the black matrix layer or the color filter layer such that;

direct projections of the main spacer and the secondary spacer on the substrate are located within a region where the black matrix layer is located,

a sum of thicknesses of portions of the black matrix layer and the color filter layer corresponding to each secondary spacer is smaller than that of portions of the black matrix layer and the color filter layer corresponding to each main spacer,

a distance from a top end of the main spacer to the substrate is larger than distances from top ends of other spacers located on the substrate to the substrate,

a height of the secondary spacer is equal to that of the main spacer, and

the thickness of the portion of the color filter layer corresponding to the main spacer is larger than that of the portion of the color filter layer corresponding to the secondary spacer located adjacent to the main spacer.

9. The method according to claim 8, wherein forming the color filter layer on the substrate comprises:

forming a film of color filter layer on the substrate;

patterning the film of color filter layer so as to form the color filter layer.

10. The method according to claim 9, wherein forming the black matrix layer on the substrate comprises:

forming a film of black matrix layer on the substrate;

patterning the film of black matrix layer so as to form the black matrix layer;

wherein a thickness of a portion of the black matrix layer corresponding to the secondary spacer to be formed is smaller than or equal to that of a portion of the black matrix layer corresponding to the main spacer to be formed.

11. The method according to claim 8, wherein:

forming the black matrix layer on the substrate comprises;

forming a film of black matrix layer on the substrate; and

patterning the film of black matrix layer so as to form the black matrix layer;

wherein a thickness of a portion of the black matrix layer corresponding to the secondary spacer to be formed is smaller than that of a portion of the black matrix layer corresponding to the main spacer to be formed; and

forming the color filter layer on the substrate comprises;

forming a film of color filter layer on the substrate; and

patterning the film of color filter layer so as to form the color filter layer.

12. The method according to claim 11, wherein the film of black matrix layer is patterned by using a half tone mask plate so as to form the black matrix layer, and wherein a completely transparent area of the half tone mask plate corresponds to a portion of the black matrix layer corresponding to the main spacer to be formed, a partly transparent area of the half tone mask plate corresponds to a portion of the black matrix layer corresponding to the secondary spacer to be formed, and a light shielding area of the half tone mask plate corresponds to regions of the substrate where no black matrix layer is formed.

13. The method according to claim 8, wherein forming the at least one main spacer and the at least one secondary spacer on the black matrix layer or the color filter layer comprises:

forming a spacer layer on the substrate on which the black matrix layer and the color filter layer have been formed; and

performing a single one patterning process on the spacer layer so as to form the at least one main spacer and the at least one secondary spacer.

14. The method according to claim 8, wherein the thickness of the portion of the color filter layer corresponding to the secondary spacer to be formed is zero.

15. The method according to claim 8, wherein forming the color filter layer on the substrate includes forming a plurality of color resistors, and wherein the at least one main spacer is located on two of the plurality of color resistors having different colors, and/or at least one secondary spacer is located on another two of the plurality of color resistors having different colors.