Display device, display system, mobile object, display control method, and recording medium storing program code

Patent metadata

Field	Value
Publication number	US-10962776-B2
Application number	US-202016779843-A
Country	US
Kind code	B2
Filing date	Feb 3, 2020
Priority date	Feb 12, 2019
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A display device includes a light source; a light deflector configured to deflect light emitted from the light source to scan as scanning light in a main scanning direction and a sub-scanning direction; a screen having a scanning area to be two-dimensionally scanned with the scanning light at a predetermined cycle, the scanning area having a first area and a second area that differ in position in the sub-scanning direction; a light receiver disposed on the screen, configured to detect the light scanning in each of the first area and the second area of the screen; and a control unit configured to adjust a position of the scanning light in the scanning area according to the number of scanning lines in each of the first area and the second area.

First claim

The invention claimed is:

1. A display device comprising:
a light source;
a light deflector configured to deflect light emitted from the light source to scan as scanning light in a main scanning direction and a sub-scanning direction;
a screen having a scanning area to be two-dimensionally scanned with the scanning light at a predetermined cycle, the scanning area having a first area and a second area that differs in position in the sub-scanning direction;
a light receiver disposed on the screen, configured to detect the light scanning in each of the first area and the second area of the screen; and
circuitry configured to adjust a position of the scanning light in the scanning area according to the number of scanning lines in each of the first area and the second area, the scanning lines being a trajectory of the scanning light detected by the light receiver in the main scanning direction.

2. The display device according to claim 1 ,
wherein the light receiver includes a first light receiver configured to detect the scanning light scanning the first area and a second light receiver configured to detect the scanning light scanning the second area.

3. The display device according to claim 2 ,
wherein the position of the first receiver is the same as the position of the second receiver in the sub-scanning direction.

4. The display device according to claim 2 ,
wherein the first receiver and the second receiver have the same shape and oriented in the same direction within the scanning area.

5. The display device according to claim 2 ,
wherein the first area includes an end of the first light receiver in the sub-scanning direction and the second area includes an end of the second light receiver, the end of the first receiver being closer to a scanning starting side in the sub-scanning direction than the other end of the first receiver and the end of the second light receiver being farther from the scanning starting side in the sub-scanning direction than the other end of the second receiver,
wherein the circuitry is configured to:
calculate a sum of an amount of change in the number of scanning lines in the first area from a predetermined number of scanning lines in the first area and an amount of change in the number of scanning lines in the second area from a predetermined number of scanning lines in the second area; and
change a size of an image formed in the scanning area in the sub-scanning direction such that the sum of the amount of change in the number of scanning lines of the first area and the second area remains at a constant value.

6. The display device according to claim 2 ,
wherein the first area includes an end of the first light receiver in the sub-scanning direction and the second area includes an end of the second light receiver, the end of the first receiver being closer to or farther from a scanning starting side in the sub-scanning direction than the other end of the first receiver and the end of the second light receiver being at the same side of the end of the first receiver included in the first area,
wherein the circuitry is configured to:
calculate a difference between an amount of change in the number of scanning lines in the first area from a predetermined number of scanning lines in the first area and an amount of change in the number of scanning lines in the second area from a predetermined number of scanning lines in the second area; and
change a size of an image formed in the scanning area in the sub-scanning direction such that the difference in the amount of change in the number of scanning lines between the first area and the second area remains at a constant value.

7. A display system comprising:
the display device according to claim 1 ; and
a reflector configured to reflect the diverging light diverged by the divergent part.

8. A mobile object comprising the display system according to claim 7 ,
wherein the reflector is a windshield configured to reflect the diverging light.

9. The display device according to claim 1 ,
wherein the circuitry is configured to change the position of an image formed in the scanning area in the sub-scanning direction.

10. The display device according to claim 1 ,
wherein the circuitry is configured to change the size of an image formed in the scanning area in the sub-scanning direction.

11. The display device according to claim 1 ,
wherein each of the first area and the second area includes either one of ends of the light receiver in the sub-scanning direction.

12. The display device according to claim 1 ,
wherein the scanning area includes a display image area in which a display image is formed,
wherein the first area and the second area are not included in the display image area.

13. The display device according to claim 1 ,
wherein the light receiver is one light receiver.

14. The display device according to claim 1 ,
wherein the circuitry is configured to switch between the first area and the second area to which the light source emits light, when the deflector scans the scanning light for each predetermined cycle.

15. The display device according to claim 1 ,
wherein the circuitry is configured to:
calculate an amount of change in the number of scanning lines in the first area from a predetermined number of scanning lines in the first area and an amount of change in the number of scanning lines in the second area from a predetermined number of scanning lines in the second area;
multiply the amount of change in the number of scanning lines in the first area by a parameter according to a position of one end of the light receiver included in the first area in the sub-scanning direction and the amount of change in the number of scanning lines in the second area by a parameter according to a position of the other end of the light receiver included in the second area in the sub-scanning direction; and

change an image forming position in the sub-scanning direction based on the multiplied values for the first area and the second area.

16. The display device according to claim 1 ,
wherein based on the amount of change in scanning lines received in the first area or the second area, the circuitry is configured to control an image forming position in the sub-scanning direction.

17. A display device comprising:
a light source;
a light deflector configured to deflect light emitted from the light source to scan as scanning light in a main scanning direction and a sub-scanning direction;
a screen to be scanned with the scanning light, the screen having a scanning area to be two-dimensionally scanned with the scanning light at a predetermined cycle, the scanning area having a first area and a second area that contain positions different in the sub-scanning direction;
a light receiver disposed on the screen, configured to detect the light scanning each of the first area and the second area of the screen; and
circuitry configured to adjust a position of the scanning light in the scanning area according to the number of light signals output from the light receiver during a time to scan the first area and the number of light signals output from the light receiver during a time to scan the second area.

18. The display device according to any one of claim 1 - 2 or 3 - 17 , further comprising an imaging optical system,
wherein the screen is a divergent part to diverge as the scanning light that has scanned the screen,
wherein the imaging optical system is configured to project diverging light diverged by the divergent part to form a virtual ima

Assignees

• Tanaka Hiroaki
• Yamashiro Toshihiro
• Ricoh Co Ltd

Inventors

• Tanaka Hiroaki
• Yamashiro Toshihiro

Classifications

• G02B26/101 Primary

  with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129) · CPC title

• G09G3/025 Primary

  with scanning or deflecting the beams in two directions or dimensions · CPC title

• G02B2027/0163

  Electric or electronic control thereof · CPC title

• G02B27/0149

  characterised by mechanical features (G02B27/0176 takes precedence) · CPC title

• G02B2027/0109

  comprising details concerning the making of holograms · CPC title