DISPLAY AND ELECTRONIC APPARATUS

• US 20090153451A1
• Filed: 12/09/2008
• Published: 06/18/2009
• Est. Priority Date: 12/18/2007
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kawazoe, Hiroyuki, Takama, Daisuke
• Granted Patent: US 8,537,082 B2
• Time in Patent Office: Days
• US Class Current: 345/84
• CPC Class Codes: G02F 1/13312 Circuits comprising photodetectors for purposes other than feedback
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen

Abstract

A display is provided. The display includes at least one display cell having a display circuit; at least one light receiving cell including a light receiving element; a light emitting section operative to radiate light to the side of a display surface; and a polarizing plate disposed on the front side in the display relative to a region in which the light emitting section is disposed and regions in which the display cell and the light receiving cell are formed, wherein a phase difference plate is disposed at a position which is on the front side relative to the light receiving cell and in either of an emitting optical path of the light emitting section and a reflecting optical path toward the light receiving cell.

Claims

1. A display comprising:

at least one display cell having a display circuit;

at least one light receiving cell including a light receiving element;

a light emitting section operative to radiate light to the side of a display surface; and

a polarizing plate disposed on the front side in said display relative to a region in which said light emitting section is disposed and regions in which said display cell and said light receiving cell are formed,

wherein a phase difference plate is disposed at a position which is on the front side relative to said light receiving cell and in either of an emitting optical path of said light emitting section and a reflecting optical path toward said light receiving cell.

2. The display as set forth in claim 1,

wherein said phase difference plate is formed at said polarizing plate'"'"'s interface with an air layer.

3. The display as set forth in claim 2,

wherein said phase difference plate emits light coming out of said polarizing plate, as circularly polarized light.

4. The display as set forth in claim 2,

wherein a surface of said phase difference plate has been subjected to a hard coating treatment.

5. The display as set forth in claim 1,

further comprising a protective transparent substrate disposed on the further front side relative to said polarizing plate,

wherein said phase difference plate is disposed at a position which is on the front side relative to said light receiving cell and in either of an emitting optical path of said light emitting section and a reflecting optical path toward said light receiving cell.

6. The display as set forth in claim 5,

wherein an air layer is provided between said polarizing plate and said protective transparent substrate, and

said phase difference plate is formed at said polarizing plate'"'"'s interface with said air layer.

7. The display as set forth in claim 6,

wherein said phase difference plate emits light coming out of said polarizing plate, as circularly polarized light.

8. The display as set forth in claim 6,

wherein a surface of said phase difference plate has been subjected to a hard coating treatment.

9. The display as set forth in claim 1,

wherein a filler layer having a refractive index of more than 1 is disposed between said polarizing plate and said protective transparent substrate, and

said phase difference plate is formed at said protective transparent substrate'"'"'s interface with said air layer.

10. The display as set forth in claim 9,

wherein a surface of said phase difference plate has been subjected to a hard coating treatment.

11. A display comprising:

at least one display cell having a display circuit;

at least one light receiving cell including a light receiving element;

a back light operative to illuminate a display surface at a predetermined luminance;

a first transparent substrate provided with said display cell and said light receiving element;

a second transparent substrate disposed opposite to said first transparent substrate;

a liquid crystal layer disposed between said first transparent substrate and said second transparent substrate;

a first polarizing plate formed on a surface, opposed to said back light, of said first transparent substrate; and

a second polarizing plate formed on the front side of said second transparent substrate,

wherein a phase difference plate is disposed at a position on the front side relative to said light receiving cell and in either of an emitting optical path of said back light and a reflecting optical path toward said light receiving cell.

12. The display as set forth in claim 11,

wherein said phase difference plate is formed at said second polarizing plate'"'"'s interface with an air layer.

13. The display as set forth in claim 12,

wherein said phase difference plate emits light coming out of said second polarizing plate, as circularly polarized light.

14. The display as set forth in claim 12,

wherein a surface of said phase difference plate has been subjected to a hard coating treatment.

15. The display as set forth in claim 11,

further comprising a protective transparent substrate on the further front side relative to said second polarizing plate,

wherein said phase difference plate is disposed at a position on the front side relative to said light receiving cell and in either of an emitting optical path of said light emitting section and a reflecting optical path toward said light receiving cell.

16. The display as set forth in claim 15,

wherein an air layer is provided between said second polarizing plate and said protective transparent substrate, and

said phase difference plate is formed at said second polarizing plate'"'"'s interface with said air layer.

17. The display as set forth in claim 16,

wherein said phase difference plate emits light coming out of said second polarizing plate, as circularly polarized light.

18. The display as set forth in claim 16,

wherein a surface of said phase difference plate has been subjected to a hard coating treatment.

19. The display as set forth in claim 11,

wherein a filler layer having a refractive index of more than 1 is disposed between said second polarizing plate and said protective transparent substrate, and

said phase difference plate is formed at said protective transparent substrate'"'"'s interface with said air layer.

20. The display as set forth in claim 19,

wherein a surface of said phase difference plate has been subjected to a hard coating treatment.

21. An electronic apparatus having a display,

said display comprising:

at least one display cell having a display circuit;

at least one light receiving cell including a light receiving element;

a light emitting section operative to radiate light to the side of a display surface; and

a polarizing plate disposed on the front side in said display relative to a region in which said light emitting section is disposed and regions in which said display cell and said light receiving cell are formed,

wherein a phase difference plate is disposed at a position which is on the front side relative to said light receiving cell and in either of an emitting optical path of said light emitting section and a reflecting optical path toward said light receiving cell.

22. The electronic apparatus as set forth in claim 21,

wherein said display further comprises a protective transparent substrate disposed on the further front side relative to said polarizing plate, and

said phase difference plate is disposed at a position on the front side relative to said light receiving cell and in either an emitting optical path of said light emitting section and a reflecting optical path toward said light receiving cell.

23. An electronic apparatus having a display,

said display comprising:

at least one display cell having a display circuit;

at least one light receiving cell including a light receiving element;

a back light operative to illuminate a display surface at a predetermined luminance;

a first transparent substrate provided with said display cell and said light receiving element;

a second transparent substrate disposed opposite to said first transparent substrate;

a liquid crystal layer disposed between said first transparent substrate and said second transparent substrate;

a first polarizing plate formed on a surface, opposed to said back light, of said first transparent substrate; and

a second polarizing plate formed on the front side of said second transparent substrate,

wherein a phase difference plate is disposed at a position on the front side relative to said light receiving cell and in either of an emitting optical path of said back light and a reflecting optical path toward said light receiving cell.

24. The electronic apparatus as set forth in claim 23,

wherein said display further comprises a protective transparent substrate disposed on the further front side relative to said second polarizing plate, and

said phase difference plate is disposed at a position on the front side relative to said light receiving cell and in either an emitting optical path of said light emitting section and a reflecting optical path toward said light receiving cell.