IMAGE DISPLAY DEVICE AND DISPLAY DEVICE

• US 20150226970A1
• Filed: 02/03/2015
• Published: 08/13/2015
• Est. Priority Date: 02/10/2014
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Mukawa, Hiroshi
• Granted Patent: US 10,539,793 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 2027/0112 comprising device for genereting colour display
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 2027/0138 comprising image capture systems, e.g. camera
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: H04N 9/3167 for polarizing the light beam polarizing optical systems per se G02B27/28

Abstract

There is provided an image display device including (A) an image forming device, (B) an optical device configured to receive incident light output from the image forming device and output the incident light, and (C) a light receiving device configured to detect the light output from the image forming device.

Claims

1. An image display device comprising:

(A) an image forming device;

(B) an optical device configured to receive incident light output from the image forming device and output the incident light; and

(C) a light receiving device configured to detect the light output from the image forming device.

2. The image display device according to claim 1,

wherein the optical device includes

(a) a light guide plate configured to cause the incident light to propagate inside the light guide plate according to total reflection and then output the incident light,

(b) a first polarizing unit configured to polarize the light incident on the light guide plate so that the light incident on the light guide plate is totally reflected inside the light guide plate, and

(c) a second polarizing unit configured to polarize the light propagating inside the light guide plate according to total reflection to output part of light propagating inside the light guide plate according to total reflection from the light guide plate,

the second polarizing unit including

a first portion that polarizes the light propagating inside the light guide plate according to total reflection toward an observer, and

a second portion that polarizes the light propagating inside the light guide plate according to total reflection toward the light receiving device.

3. The image display device according to claim 1,

wherein the optical device includes

(a) a light guide plate configured to cause the incident light to propagate inside the light guide plate according to total reflection and then output the incident light,

(b) a first polarizing unit configured to polarize the light incident on the light guide plate so that the light incident on the light guide plate is totally reflected inside the light guide plate, and

(c) a second polarizing unit configured to polarize the light propagating inside the light guide plate according to total reflection to output part of light propagating inside the light guide plate according to total reflection from the light guide plate, and

wherein the light receiving device is arranged on an end portion of the light guide plate at a side of the second polarizing unit.

4. The image display device according to claim 2,

wherein the second polarizing unit is configured with a reflective volume hologram diffraction grating.

5. The image display device according to claim 1,

wherein the optical device includes a light semi-reflecting member that reflects part of light output from the image forming device and transmits a remaining part, and

wherein the light receiving device detects the light passing through the light semi-reflecting member.

6. The image display device according to claim 1,

wherein the light receiving device is optically connected to the optical device.

7. The image display device according to claim 1,

wherein an operation of the image forming device is controlled based on a detection result of the light receiving device.

8. The image display device according to claim 7,

wherein a position of an image to be output from the image forming device is controlled based on the detection result of the light receiving device.

9. The image display device according to claim 1,

wherein the image forming device includes a light source configured with a GaN semiconductor laser element,

wherein the optical device includes

(a) a light guide plate configured to cause the incident light to propagate inside the light guide plate according to total reflection and then output the incident light,

(b) a first polarizing unit configured to polarize the light incident on the light guide plate so that the light incident on the light guide plate is totally reflected inside the light guide plate, the first polarizing unit being configured with a reflecting mirror or a semi-transmissive mirror, and

(c) a second polarizing unit configured to polarize the light propagating inside the light guide plate according to total reflection to output part of light propagating inside the light guide plate according to total reflection from the light guide plate, the second polarizing unit being configured with a reflective volume hologram diffraction grating,

the second polarizing unit including

a first portion that polarizes the light propagating inside the light guide plate according to total reflection toward an observer, and

a second portion that polarizes the light propagating inside the light guide plate according to total reflection toward the light receiving device, and

wherein a wavelength of light output from the light source is controlled based on a detection result of the light receiving device.

10. The image display device according to claim 1,

wherein the image forming device includes a light source configured with a GaN semiconductor laser element,

wherein the optical device includes

(a) a light guide plate configured to cause the incident light to propagate inside the light guide plate according to total reflection and then output the incident light,

(b) a first polarizing unit configured to polarize the light incident on the light guide plate so that the light incident on the light guide plate is totally reflected inside the light guide plate, the first polarizing unit being configured with a reflecting mirror or a semi-transmissive mirror, and

(c) a second polarizing unit configured to polarize the light propagating inside the light guide plate according to total reflection to output part of light propagating inside the light guide plate according to total reflection from the light guide plate, the second polarizing unit being configured with a reflective volume hologram diffraction grating,

wherein the light receiving device is arranged on an end portion of the light guide plate at a side of the second polarizing unit, and

wherein a wavelength of light output from the light source is controlled based on a detection result of the light receiving device.

11. The image display device according to claim 1,

wherein the image forming device includes a light source configured with a GaN semiconductor laser element,

wherein the optical device includes a light semi-reflecting member that reflects part of light output from the image forming device and transmits a remaining part, and

wherein the light receiving device detects the light passing through the light semi-reflecting member, and controls a wavelength of light output from the light source based on a detection result.

12. The image display device according to claim 1,

wherein the light receiving device is configured in a manner that light receiving elements are arranged one-dimensionally or in a manner that light receiving elements are arranged in a two dimensional (2D) matrix.

13. A display device comprising:

(I) a frame to be mounted on a head of an observer; and

(II) an image display device mounted on the frame,

the image display device including

(A) an image forming device,

(B) an optical device configured to receive incident light output from the image forming device and outputs the incident light, and

(C) a light receiving device configured to detect the light output from the image forming device.

14. An image display device comprising:

(A) an image forming device configured to include a liquid crystal display device and a light source;

(B) a light guide plate configured to propagate light output from the image forming device; and

(C) a light receiving device configured to detect part of light output from the image forming device,

wherein a wavelength of light output from the light source is controlled based on a detection result of the light receiving device.

15. The image display device according to claim 14,

wherein the light receiving device is arranged on an end portion of the light guide plate.

16. The image display device according to claim 14, further comprising:

a light semi-reflecting member that reflects part of light output from the image forming device and transmits a remaining part,

wherein the light receiving device detects the light passing through the light semi-reflecting member.