Display device

Patent metadata

Field	Value
Publication number	US-9791702-B2
Application number	US-201514944064-A
Country	US
Kind code	B2
Filing date	Nov 17, 2015
Priority date	Nov 19, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

According to one embodiment, a display device includes a display, an optical unit, and a reflector. The display includes a first display region emitting a first bundle of rays and a second display region emitting a second bundle of rays. The optical unit includes first and second emission regions transmitting the first and the second bundle of rays. The reflector includes a first reflection region reflecting the first bundle of rays, and a second reflection region reflecting the second bundle of rays. The optical unit forms a first focal point of the first bundle of rays between the optical unit and the reflector, and forms a second focal point of the second bundle of rays between the optical unit and the reflector. A distance between the first emission region and the first reflection region is shorter than a distance between the second emission region and the second reflection region.

First claim

What is claimed is:

1. A display device, comprising:
a display including a first display region emitting a first bundle of rays and a second display region emitting a second bundle of rays;
an optical unit including a first emission region transmitting the first bundle of rays and a second emission region transmitting the second bundle of rays; and
a reflector which reflects at least a portion of the first bundle of rays and at least a portion of the second bundle of rays, the reflector including a first reflection region reflecting the at least a portion of the first bundle of rays, and a second reflection region reflecting the at least a portion of the second bundle of rays,
wherein the optical unit forms a first focal point of the first bundle of rays between the optical unit and the reflector and forms a second focal point of the second bundle of rays between the optical unit and the reflector,
wherein a distance between the first emission region and the first reflection region is shorter than a distance between the second emission region and the second reflection region,
wherein a first distance between the first focal point and the first reflection region is shorter than a second distance between the second focal point and the second reflection region,
wherein the reflector includes a plurality of reflective surfaces and the reflective surface has a refractive power.

2. A display device, comprising:
a display including a first display region emitting a first bundle of rays and a second display region emitting a second bundle of rays;
an optical unit including a first emission region transmitting the first bundle of rays and a second emission region transmitting the second bundle of rays; and
a reflector which reflects at least a portion of the first bundle of rays and at least a portion of the second bundle of rays, the reflector including a first reflection region reflecting the at least a portion of the first bundle of rays, and a second reflection region reflecting the at least a portion of the second bundle of rays,
wherein the optical unit forms a first focal point of the first bundle of rays between the optical unit and the reflector and forms a second focal point of the second bundle of rays between the optical unit and the reflector,
wherein a distance between the first emission region and the first reflection region is shorter than a distance between the second emission region and the second reflection region,
wherein a first distance between the first focal point and the first reflection region is shorter than a second distance between the second focal point and the second reflection region,
wherein
the reflector includes a first reflective surface and a second reflective surface, the second reflective surface being tilted with respect to the first reflective surface,
a center of the first reflection region is positioned on the first reflective surface, and
a center of the second reflection region is positioned on the second reflective surface.

3. The device according to claim 2 , wherein a first incident angle of a first light ray of a center of the first bundle of rays on the first reflective surface is different from a second incident angle of a second light ray of a center of the second bundle of rays on the second reflective surface.

4. The device according to claim 2 , wherein a first incident angle of a first light ray of a center of the first bundle of rays on the first reflective surface is larger than a second incident angle of a second light ray of a center of the second bundle of rays on the second reflective surface.

5. The device according to claim 2 , wherein
the first reflective surface is arranged with the second reflective surface on an arrangement surface, and
an angle between the first reflective surface and the arrangement surface is smaller than an angle between the second reflective surface and the arrangement surface.

6. The device according to any one of claim 1 , wherein
the optical unit further includes a first optical member and a second optical member, the second optical member being provided between the first optical member and the display in an optical path of a light ray included in the first bundle of rays, and
the first emission region and the second emission region are positioned on the first optical member.

7. The device according to any one of claim 1 , wherein
the optical unit includes a first lens, the first bundle of rays and the second bundle of rays passing through the first lens,
the first lens includes:
a first portion, the first bundle of rays passing through the first portion; and
a second portion, the second bundle of rays passing through the second portion, and

a length of the first portion along a direction of the first bundle of rays is longer than a length of the second portion along a direction of the second bundle of rays.

8. The device according to claim 1 , wherein
the optical unit includes a first lens, the first bundle of rays and the second bundle of rays passing through the first lens,
the first lens includes:
a first portion, the first bundle of rays passing through the first portion; and
a second portion, the second bundle of rays passing through the second portion, and

a refractive power of the first portion is smaller than a refractive power of the second portion.

9. The device according to claim 1 , wherein
the optical unit includes a prism, the first bundle of rays and the second bundle of rays passing through the prism,
the prism includes:
a portion transmitting the first bundle of rays; and
a portion transmitting the second bundle of rays, and

an optical distance along a direction of the first bundle of rays of the portion of the prism transmitting the first bundle of rays is longer than an optical distance along a direction of the second bundle of rays of the portion of the prism transmitting the second bundle of rays.

10. A display device, comprising:
a display including a first display region emitting a first bundle of rays and a second display region emitting a second bundle of rays;
an optical unit including a first emission region transmitting the first bundle of rays and a second emission region transmitting the second bundle of rays; and
a reflector which reflects at least a portion of the first bundle of rays and at least a portion of the second bundle of rays, the reflector including a first reflection region reflecting the at least a portion of the first bundle of rays, and a second reflection region reflecting the at least a portion of the second bundle of rays,
wherein the optical unit forms a first focal point of the first bundle of rays between the optical unit and the reflector and forms a second focal point of the second bundle of rays between the optical unit and the reflector,
wherein a distance between the first emission region and the first reflection region is shorter than a distance between the second emission region and the second reflection region,
wherein a first distance between the first focal point and the first reflection region is shorter than a second distance between the second focal point and the second reflection region,
wherein the reflector transmits a portion of the first bundle of rays and a portion of the second bundle of rays.

11. A display device, comprising:
a display including a first display region emitting a first bundle of rays and a second display region emitting a second bundle of rays;
an optical unit including a first emission region transmitting the first bundle of rays and a second emission region transmitting the second bundle of rays; and
a reflector which reflects at least a portion of the firs

Assignees

• Toshiba Kk

Inventors

• Sawada Shimpei
• Horiuchi Kazuo
• Kokojima Yoshiyuki
• Baba Masahiro

Classifications

• G02B17/08

  Catadioptric systems {(used in non-imaging applications G02B19/00)} · CPC title

• G02B27/0172 Primary

  characterised by optical features · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B17/002

  Arrays of reflective systems · CPC title

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title