Display substrate and display panel having the same

• US 9,575,348 B2
• Filed: 07/22/2014
• Issued: 02/21/2017
• Est. Priority Date: 09/24/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Sangwook, Park, Joonyong, Kim, Hyungjune, Yoon, YeoGeon, Kim, Kyungseop, Shin, Sangwon, Jeong, Changoh, Kang, Hyun-Ho, Kim, Taehyung, Yim, Taekyung
• Primary Examiner(s): Briggs, Nathanael R
• Assistant Examiner(s): Peterson, William
• Application Number:
  US14/338,066
• Publication Number:
  US 20150085229A1
• Time in Patent Office: 945 Days
• Field of Search: 349/119
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates

Abstract

A display substrate is disclosed. In one aspect, the display substrate includes a base substrate having a first refractive index and receiving external light and an insulating layer disposed below the base substrate and having a second refractive index different from the first refractive index. The display substrate also includes a pixel electrode disposed below the first insulating layer and a first compensation layer forming an interface with the insulating layer and having a third refractive index greater than the first refractive index and less than the second refractive index. The first compensation layer is disposed between the first insulating layer and the base substrate.

Claims

1. A display substrate, comprising:

a base substrate having a first refractive index and configured to receive external light;

a first insulating layer disposed below the base substrate and having a second refractive index different from the first refractive index, wherein the first insulating layer has an inherent reflective spectrum;

a pixel electrode disposed below the first insulating layer; and

a first compensation layer disposed between the first insulating layer and the base substrate, wherein an interface is defined between the first insulating layer and the first compensation layer,

wherein the first compensation layer has a third refractive index greater than the first refractive index and less than the second refractive index,

wherein the interface is configured to reflect a portion of the external light, wherein the light reflected from the interface has a reflective spectrum, and wherein the first compensation layer is configured to modify the inherent reflective spectrum of the first insulating layer to generate the reflective spectrum of the reflected light.

2. The display substrate of claim 1, further comprising a plurality of signal lines disposed between the base substrate and the first insulating layer, wherein the first compensation layer is disposed between the base substrate and the signal lines.

3. The display substrate of claim 1, further comprising a second compensation layer disposed between the first insulating layer and the pixel electrode, wherein the second compensation layer has a refractive index between the refractive indices of neighboring layers thereof.

4. The display substrate of claim 3, further comprising a second insulating layer disposed between the first insulating layer and the pixel electrode and configured to reflect at least a part of the external light at a surface thereof facing the second compensation layer, wherein the refractive index of the second compensation layer is between the refractive index of the second insulating layer and the refractive index of the pixel electrode.

5. The display panel of claim 3, further comprising a second insulating layer is disposed between the second compensation layer and the pixel electrode and configured to reflect at least a part of the external light at a surface thereof facing the second compensation layer, wherein the refractive index of the second compensation layer is between the refractive index of the first insulating layer and the refractive index of the second insulating layer.

6. The display substrate of claim 1, wherein the first insulating layer is formed at least partially of silicon nitride and the first compensation layer is formed at least partially of silicon oxynitride.

7. The display substrate of claim 6, wherein the first compensation layer has a thickness between about 800 angstroms to about 1500 angstroms.

8. The display substrate of claim 7, wherein the pixel electrode has a thickness between about 1100 angstroms to about 1300 angstroms.

9. The display substrate of claim 1, further comprising a common electrode disposed below the pixel electrode, wherein the pixel electrode is configured to receive a first voltage and wherein the common electrode is configured to receive a second voltage different from the first voltage.

10. A display substrate, comprising:

a base substrate configured to receive external light;

an insulating layer disposed below the base substrate and having a first refractive index, wherein the insulating layer has an inherent reflective spectrum;

a pixel electrode disposed below the insulating layer and having a second refractive index; and

a first compensation layer disposed between the insulating layer and the pixel electrode, wherein an interface is defined between the insulating layer and the first compensation layer,

wherein the first compensation layer has a third refractive index greater than the first refractive index and less than the second refractive index,

wherein the interface is configured to reflect a portion of the external light, wherein the light reflected from the interface has a reflective spectrum, and wherein the first compensation layer is configured to modify the inherent reflective spectrum of the insulating layer to generate the reflective spectrum of the reflected light.

11. The display substrate of claim 10, further comprising an organic layer disposed between the pixel electrode and the first compensation layer and configured to reflect at least a part of the external light at a surface thereof facing the first compensation layer, wherein the organic layer has a fourth refractive index greater than the third refractive index.

12. The display substrate of claim 10, wherein the organic layer comprises a color filter layer.

19. The display panel of claim 12, wherein the second display substrate comprises:

a second base substrate facing the first base substrate; and

a second electrode disposed over the second base substrate and facing the first electrode, wherein the first and second electrodes are configured to form an electric field therebetween.

20. The display substrate of claim 19, further comprising a liquid crystal layer disposed between the first and second display substrates.

13. A display panel, comprising:

a first display substrate configured to receive external light; and

a second display substrate facing the first display substrate,

wherein the first display substrate comprises;

a first base substrate having a first refractive index and configured to receive the external light;

a first insulating layer disposed below the first base substrate and having a second refractive index different from the first refractive index, wherein the first insulating layer has an inherent reflective spectrum;

a first electrode disposed below the first insulating layer; and

a first compensation layer, wherein an interface is defined between the first insulating layer and the first compensation layer,

wherein the first compensation layer has a third refractive index greater than the first refractive index and less than the second refractive index,

wherein the interface is configured to reflect a portion of the external light, wherein the light reflected from the interface has a reflective spectrum, and wherein the first compensation layer is configured to modify the inherent reflective spectrum of the first insulating layer to generate the reflective spectrum of the reflected light.

14. The display panel of claim 13, wherein the first compensation layer is disposed between the first base substrate and the first insulating layer and wherein the thickness of the first compensation layer is between about 700 Å

to about 1100 Å

.

15. The display panel of claim 14, further comprising:

a second insulating layer disposed between the first insulating layer and the first electrode; and

a second compensation layer disposed between the first and second insulating layers, wherein the second compensation layer has a refractive index between the refractive index of the first insulating layer and the refractive index of the second insulating layer.

16. The display panel of claim 15, wherein the second insulating layer further comprises an organic layer.

17. The display panel of claim 16, wherein the organic layer comprises a color filter layer.

18. The display panel of claim 17, wherein the first electrode has a thickness between about 1100 Å

to about 1300 Å

.