Head mounted image display device and display device

1. An image display device comprising:

an image forming device;

an optical device configured to receive incident light output from the image forming device and output the incident light, the optical device including 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;

a light receiving device arranged on a first surface of the light guide plate and configured to detect the light output from the optical device; and

a control device configured to control an image output from the image forming device based on a detection result from the light receiving device,

wherein the optical device further includes:

a first polarizing unit arranged on a second surface of the light guide plate and 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

a second polarizing unit arranged on the second surface of the light guide plate and configured to polarize the light propagating inside the light guide plate according to total reflection to output the light propagating inside the light guide plate according to total reflection from the light guide plate,

wherein the light receiving device is configured to detect an occurrence of an abnormality in the image display device based on an image detected by the light receiving device, the image being detected based on the part of the light received by the light receiving device from the second polarizing unit, and

wherein the first surface of the light guide plate and the second surface of the light guide plate face each other.

2. The image display device according to claim 1 ,

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

3. 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.

4. The image display device according to claim 1 ,

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

5. The image display device according to claim 1 ,

wherein an operation of the image forming device is controlled based on the detection of the occurrence of the abnormality in the image display device by the light receiving device.

6. The image display device according to claim 5 ,

wherein a position of an image to be output from the image forming device is controlled based on the detection of the occurrence of the abnormality in the image display device by the light receiving device.

7. 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 the detection result.

8. 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.

9. The image display device according to claim 1 , wherein the detection of the occurrence of the abnormality in the image display device comprises detection of a deviation in a position of an image output from the image forming device and a position of the image detected by the light receiving device.

10. The image display device according to claim 1 , wherein the second polarizing unit comprises:

a first portion configured to polarize part of the light propagating inside the light guide plate according to total reflection towards an observer, and

a second portion configured to polarize part of the light propagating inside the light guide plate according to total reflection towards the light receiving device arranged on the first surface of the light guide plate.

11. A display device comprising:

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

an image display device mounted on the frame, the image display device including:

an image forming device,

an optical device configured to receive incident light output from the image forming device and output the incident light, the optical device including 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,

a light receiving device arranged on a first surface of the light guide plate and configured to detect the light output from the optical device; and

a control device configured to control an image output from the image forming device based on a detection result from the light receiving device,

wherein the optical device further includes:

a first polarizing unit arranged on a second surface of the light guide plate and 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

a second polarizing unit arranged on the second surface of the light guide plate and configured to polarize the light propagating inside the light guide plate according to total reflection to output the light propagating inside the light guide plate according to total reflection from the light guide plate,

wherein the light receiving device is configured to detect an occurrence of an abnormality in the image display device based on an image detected by the light receiving device, the image being detected based on the part of the light received by the light receiving device from the second polarizing unit, and

wherein the first surface of the light guide plate and the second surface of the light guide plate face each other.

12. An image display device comprising:

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

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

a light receiving device arranged on a first surface of the light guide plate and configured to detect part of light output from the optical device; and

a control device configured to control an image output from the image forming device based on a detection result from the light receiving device,

wherein a first polarizing unit is disposed inside the light guide plate, is arranged on a second surface of the light guide plate, and is 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

a second polarizing unit is disposed inside the light guide plate, is arranged on the second surface of the light guide plate, and is configured to polarize the light propagating inside the light guide plate according to total reflection to output the light propagating inside the light guide plate according to total reflection from the light guide plate,

wherein the light receiving device is configured to detect an occurrence of an abnormality in the image display device based on an image detected by the light receiving device, the image being detected based on the part of the light received by the light receiving device from the second polarizing unit,

wherein a wavelength of light output from the light source is controlled based on the detection of the occurrence of the abnormality in the image display device by the light receiving device, and

wherein the first surface of the light guide plate and the second surface of the light guide plate face each other.

13. The image display device according to claim 12 ,

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

14. The image display device according to claim 12 , 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.

15. The image display device according to claim 1 ,

wherein a wavelength of light output from the image forming device is controlled based on the detection of the occurrence of the abnormality in the image display device by the light receiving device.

16. The display device according to claim 11 ,

wherein a wavelength of light output from the image forming device is controlled based on the detection of the occurrence of the abnormality in the image display device by the light receiving device.