DISPLAY DEVICE, ELECTRONIC APPARATUS, AND PROJECTION IMAGING APPARATUS

• US 20110051029A1
• Filed: 08/25/2010
• Published: 03/03/2011
• Est. Priority Date: 09/01/2009
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: OKUMURA, Osamu
• Application Number:
  US12/862,873
• Publication Number:
  US 20110051029A1
• Time in Patent Office: Days
• US Class Current: 349/57
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 5/04 Prisms
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: G03B 21/60 characterised by the nature of the surface

Abstract

A display device includes a display panel, and a prism that is installed on a display face of the display panel and has an inclination face inclined from the display face. An inclination angle of the inclination face of the prism with respect to the display face is set such that an output angle of display light output from the display face and transmitted through the prism is equal to or more than a small angle of an incident angle and a reflection angle of sunlight with respect to the inclination face based on a normal line of the display face.

Claims

1. A display device comprising:

a display panel; and

a prism that is installed on a display face of the display panel and has an inclination face inclined from the display face,

wherein an inclination angle of the inclination face of the prism with respect to the display face is set such that an output angle of display light output from the display face and transmitted through the prism is equal to or more than a small angle of an incident angle and a reflection angle of sunlight with respect to the inclination face based on a normal line of the display face.

2. The display device according to claim 1, wherein the inclination angle of the inclination face is equal to or less than 30°

.

3. The display device according to claim 1, wherein when a sum of the incident angle and the reflection angle of the sunlight with respect to the inclination angle based on the normal line of the display face is equal to or more than 20°

and equal to or less than 50°

, the inclination angle of the inclination face with respect to the display face is equal to or more than 6° and

equal to or less than 18.5°

.

4. The display device according to claim 1, wherein the prism is provided in close contact with the display face of the display panel.

5. The display device according to claim 1, wherein the prism is a prism sheet having a plurality of inclination faces inclined and arranged in the same direction.

6. The display device according to claim 5, wherein the display panel has a plurality of pixels arranged in a first direction and a second direction intersecting the first direction, and the prism is provided on the display panel such that an extending direction of the plurality of inclination faces intersects the first direction and the second direction.

7. The display device according to claim 1, wherein the display panel has at least a polarization element on the incident side of the sunlight, and the polarization element is provided on the inclination face of the prism.

8. The display device according to claim 7, wherein the display panel is a liquid crystal panel, initial alignment of liquid crystal molecules in the liquid crystal panel is substantially parallel to the display face, the prism is provided on the display face such that the inclination direction of the inclination face and the initial alignment direction of the liquid crystal molecules intersect with each other based on the normal line of the display face, and the polarization element is provided on the inclination face such that an absorption axis is substantially the same as the initial alignment direction.

9. An electronic apparatus comprising:

a display device that includes;

a display panel; and

a prism that is installed on a display face of the display panel and has an inclination face inclined from the display face,

wherein an inclination angle of the inclination face of the prism with respect to the display face is set such that an output angle of display light output from the display face and transmitted through the prism is equal to or more than a small angle of an incident angle and a reflection angle of sunlight with respect to the inclination face based on a normal line of the display face.

10. The electronic apparatus according to claim 9, wherein the inclination angle of the inclination face is equal to or less than 30°

.

11. The electronic apparatus according to claim 9, wherein when a sum of the incident angle and the reflection angle of the sunlight with respect to the inclination angle based on the normal line of the display face is equal to or more than 20°

and equal to or less than 50°

, the inclination angle of the inclination face with respect to the display face is equal to or more than 6° and

equal to or less than 18.5°

.

12. The electronic apparatus according to claim 9, wherein the prism is provided in close contact with the display face of the display panel.

13. The electronic apparatus according to claim 9, wherein the prism is a prism sheet having a plurality of inclination faces inclined and arranged in the same direction.

14. The electronic apparatus according to claim 13, wherein the display panel has a plurality of pixels arranged in a first direction and a second direction intersecting the first direction, and the prism is provided on the display panel such that an extending direction of the plurality of inclination faces intersects the first direction and the second direction.

15. The electronic apparatus according to claim 9, wherein the display panel has at least a polarization element on the incident side of the sunlight, and the polarization element is provided on the inclination face of the prism.

16. The electronic apparatus according to claim 15, wherein the display panel is a liquid crystal panel, initial alignment of liquid crystal molecules in the liquid crystal panel is substantially parallel to the display face, the prism is provided on the display face such that the inclination direction of the inclination face and the initial alignment direction of the liquid crystal molecules intersect with each other based on the normal line of the display face, and the polarization element is provided on the inclination face such that an absorption axis is substantially the same as the initial alignment direction.

17. A projection imaging apparatus comprising:

a display device that includes;

a display panel; and

a prism that is installed on a display face of the display panel and has an inclination face inclined from the display face,

wherein an inclination angle of the inclination face of the prism with respect to the display face is set such that an output angle of display light output from the display face and transmitted through the prism is equal to or more than a small angle of an incident angle and a reflection angle of sunlight with respect to the inclination face based on a normal line of the display face.

18. The projection imaging apparatus according to claim 17, wherein the inclination angle of the inclination face is equal to or less than 30°

.

19. The projection imaging apparatus according to claim 17, wherein when a sum of the incident angle and the reflection angle of the sunlight with respect to the inclination angle based on the normal line of the display face is equal to or more than 20°

and equal to or less than 50°

, the inclination angle of the inclination face with respect to the display face is equal to or more than 6° and

equal to or less than 18.5°

.

20. The projection imaging apparatus according to claim 17, wherein the prism is provided in close contact with the display face of the display panel.

21. The projection imaging apparatus according to claim 17, wherein the prism is a prism sheet having a plurality of inclination faces inclined and arranged in the same direction.

22. The projection imaging apparatus according to claim 21, wherein the display panel has a plurality of pixels arranged in a first direction and a second direction intersecting the first direction, and the prism is provided on the display panel such that an extending direction of the plurality of inclination faces intersects the first direction and the second direction.

23. The projection imaging apparatus according to claim 17, wherein the display panel has at least a polarization element on the incident side of the sunlight, and the polarization element is provided on the inclination face of the prism.

24. The projection imaging apparatus according to claim 23, wherein the display panel is a liquid crystal panel, initial alignment of liquid crystal molecules in the liquid crystal panel is substantially parallel to the display face, the prism is provided on the display face such that the inclination direction of the inclination face and the initial alignment direction of the liquid crystal molecules intersect with each other based on the normal line of the display face, and the polarization element is provided on the inclination face such that an absorption axis is substantially the same as the initial alignment direction.