IMAGE DISPLAY DEVICE AND DISPLAY APPARATUS

• US 20150229897A1
• 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 10,477,174 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 2027/0178 Eyeglass type eyeglass details G02C
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: H04N 9/3144 Cooling systems cooling of liquid crystal cells in general G02F1/133382; cooling of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/16
• CPC Class Codes: H04N 9/73 Colour balance circuits, e.g. white balance circuits or colour temperature control camera processing pipelines for colour balance H04N23/88

Abstract

An image display device includes an image forming unit, an optical unit, a temperature measuring unit, and a control unit. The optical unit is configured to input and output light that is output from the image forming unit. The temperature measuring unit is configured to measure a temperature of the image forming unit. The control unit is configured to control an operation of the image forming unit based on a result of a temperature measurement by the temperature measuring unit.

Claims

1. An image display device, comprising:

an image forming unit;

an optical unit configured to input and output light that is output from the image forming unit;

a temperature measuring unit configured to measure a temperature of the image forming unit; and

a control unit configured to control an operation of the image forming unit based on a result of a temperature measurement by the temperature measuring unit.

2. The image display device according to claim 1, wherein

the image forming unit includes a light source including a GaN-based semiconductor laser element,

the temperature measuring unit is configured to measure a temperature of the semiconductor laser element, and

the control unit is configured to control a wavelength of the semiconductor laser element.

3. The image display device according to claim 2, wherein

the control unit is configured to control a current supplied to the semiconductor laser element to thus control the wavelength of the semiconductor laser element.

4. The image display device according to claim 2, wherein

the semiconductor laser element is configured to emit one of green light and blue light.

5. The image display device according to claim 1, wherein

the image forming unit includes a light source including a semiconductor laser element,

the temperature measuring unit is configured to measure a temperature of the semiconductor laser element, and

the control unit is configured to control an output position of the light from the image forming unit.

6. The image display device according to claim 5, wherein

the semiconductor laser element is configured to emit red light.

7. The image display device according to claim 1, wherein

the optical unit includes

a light guide plate configured to output light after input light is propagated inside the light guide plate by total reflection,

a first deflection unit including one of a reflecting mirror and a semi-transmissive mirror and configured to deflect at least part of the light input to the light guide plate, to totally reflect the light input to the light guide plate inside the light guide plate, and

a second deflection unit including a diffraction grating member and configured to deflect the light propagated inside the light guide plate by total reflection, to output, from the light guide plate, the light propagated inside the light guide plate by total reflection.

8. A display apparatus, comprising:

a frame mounted onto a head of an observer; and

an image display device attached to the frame, the image display device including

an image forming unit,

an optical unit configured to input and output light that is output from the image forming unit,

a temperature measuring unit configured to measure a temperature of the image forming unit, and

a control unit configured to control an operation of the image forming unit based on a result of a temperature measurement by the temperature measuring unit.

9. An image display device, comprising:

an image forming unit including

a liquid crystal display unit, and

a light source;

an optical unit configured to input and output light that is output from the image forming unit;

a temperature measuring unit configured to measure a temperature of the light source; and

a control unit configured to control an operation of the light source based on a result of a temperature measurement by the temperature measuring unit.

10. The image display device according to claim 9, wherein

the light source includes a GaN-based semiconductor laser element.

11. The image display device according to claim 9, wherein

the control unit is configured to control an output position of the light from the image forming unit.

12. The image display device according to claim 11, wherein

the optical unit includes

a light guide plate configured to output light after input light is propagated inside the light guide plate by total reflection,

a first deflection unit including one of a reflecting mirror and a semi-transmissive mirror and configured to deflect at least part of the light input to the light guide plate, to totally reflect the light input to the light guide plate inside the light guide plate, and

a second deflection unit including a diffraction grating member and configured to deflect the light propagated inside the light guide plate by total reflection, to output, from the light guide plate, the light propagated inside the light guide plate by total reflection.