Display and electronic apparatus

• US 8,537,082 B2
• Filed: 12/09/2008
• Issued: 09/17/2013
• Est. Priority Date: 12/18/2007
• Status: Expired due to Fees

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: Takama, Daisuke, Kawazoe, Hiroyuki
• Primary Examiner(s): Feild, Joseph
• Assistant Examiner(s): Sasinowski, Andrew
• Application Number:
  US12/330,703
• Publication Number:
  US 20090153451A1
• Time in Patent Office: 1,743 Days
• Field of Search: 345/84, 345/173, 345/175, 345/174, 345/176, 345/177, 345/207
• 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;

a light emitting section operative to radiate light toward a front side of the display;

a first polarizing plate disposed above the light emitting section toward the front side of the display, and disposed in regions in which said display cell and a light receiving cell are formed, the light receiving cell including a light receiving element formed above the first polarizing plate;

a second polarizing plate formed above the light receiving cell;

a first transparent substrate disposed above the second polarizing plate toward the front side of the display, and disposed in either of an emitting optical path of said light emitting section and a reflecting optical path toward said light receiving cell; and

a second transparent substrate disposed above first transparent substrate toward the front side of the display,

wherein the first polarization plate, the second polarization plate, and the first transparent substrate are configured such that light radiated outward from the light emitting section through the first polarization plate, the second polarization plate, and the first transparent substrate, and then reflected back toward the light emitting section by either an upper or lower surface of the second transparent substrate is absorbed by the second polarization plate after being transmitted again through the first transparent substrate.

2. The display as set forth in claim 1,

wherein an air layer exists between the first transparent substrate and the second transparent substrate.

3. The display as set forth in claim 2,

wherein said first transparent substrate emits light coming out of the second polarizing plate, as circularly polarized light.

4. The display as set forth in claim 2,

wherein a surface of said first transparent substrate has been subjected to a hard coating treatment.

5. The display as set forth in claim 1,

wherein the first transparent substrate is a phase difference plate, and the second transparent substrate is a protective transparent substrate.

6. The display as set forth in claim 1,

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

7. The display as set forth in claim 6,

wherein a surface of the first transparent substrate has been subjected to a hard coating treatment.

8. The display as set forth in claim 1, wherein the second transparent substrate includes a lower surface on a side nearer to the first transparent substrate and an upper surface opposite thereto, and the upper surface of the second transparent substrate is an exposed outer surface of the display.

9. The display as set forth in claim 1, wherein the first transparent substrate is a first phase difference plate, the display further comprising a second phase difference plate formed above the second transparent substrate.

10. 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 front side of the display at a predetermined luminance;

a first polarizing plate disposed above the back light toward the front side of the display;

a first transparent substrate provided with said display cell and said light receiving element, and provided above the first polarizing plate;

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 second polarizing plate formed above the second transparent substrate;

a third transparent substrate disposed above the second polarizing plate, and disposed in either of an emitting optical path of said back light and a reflecting optical path toward said light receiving cell; and

a fourth transparent substrate disposed above the third transparent substrate toward the front side of the display.

11. The display as set forth in claim 10,

wherein an air layer exists between the third transparent substrate and the fourth transparent substrate.

12. The display as set forth in claim 11,

wherein the second third substrate emits light coming out of said second polarizing plate, as circularly polarized light.

13. The display as set forth in claim 11,

wherein a surface of the third transparent substrate has been subjected to a hard coating treatment.

14. The display as set forth in claim 10,

wherein the third transparent substrate is a phase difference plate, and the fourth transparent substrate is a protective transparent substrate.

15. The display as set forth in claim 10,

wherein a filler layer having a refractive index of more than 1 is disposed between the second polarizing plate and the fourth transparent substrate.

16. The display as set forth in claim 15,

wherein a surface of the third transparent substrate has been subjected to a hard coating treatment.

17. The display as set forth in claim 10, wherein the first polarization plate, the second polarization plate, and the third transparent substrate are configured such that light radiated outward from the back light through the first polarization plate, the second polarization plate, and the third transparent substrate, and then reflected back toward the back light by either an upper or lower surface of the fourth transparent substrate is absorbed by the second polarization plate after being transmitted again through the third transparent substrate.

18. An electronic apparatus comprising:

a processor; and

a display operable with the processor, the display including;

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 front side of the display at a predetermined luminance;

a first polarizing plate disposed above the back light toward the front side of the display;

a first transparent substrate provided with said display cell and said light receiving element, and provided above the first polarizing plate;

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 second polarizing plate formed above the second transparent substrate;

a third transparent substrate disposed above the second polarizing plate, and disposed in either of an emitting optical path of said back light and a reflecting optical path toward said light receiving cell; and

a fourth transparent substrate disposed above the third transparent substrate toward the front side of the display.

19. The electronic apparatus as set forth in claim 18,

wherein the third transparent substrate is a phase difference plate, and the fourth transparent substrate is a protective transparent substrate.