See-around type head mounted display device

• US 20030030596A1
• Filed: 08/08/2002
• Published: 02/13/2003
• Est. Priority Date: 08/08/2001
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Tae Soo
• Granted Patent: US 7,002,534 B2
• Time in Patent Office: Days
• US Class Current: 345/8
• CPC Class Codes: G02B 2027/0132 comprising binocular systems
• CPC Class Codes: G02B 27/0172 characterised by optical features

Abstract

A see-around type head mounted display device is disclosed, which includes a display panel displaying an image restored from an image record medium, and tilted bar prism optics (TBPO) internally reflecting the light emitted from the display panel in total, and generating an enlarged virtual image in front of an observer.

Claims

1. A head mounted display device comprising:

a display panel displaying an image restored from an image record medium; and

tilted bar prism optics (TBPO) internally reflecting the light emitted from the display panel in total, and generating an enlarged virtual image in front of an observer.

2. The head mounted display device as claimed in claim 1, wherein the TBPO comprising;

a bar type prism having two tilted surfaces and a total internal reflection surface, reflecting light emitted from the display panel to an eye of an observer through the total internal reflection surface, and

an eyepiece lens opposing the total internal reflection surface of the prism so as to display an enlarged virtual image in front of the observer.

3. The head mounted display device as claimed in claim 2, wherein the prism comprising;

a first tilted surface opposing the eyepiece lens and reflecting the light reflected from the total internal reflection surface to the eye of the observer, and

a second tilted surface opposing the display panel, and controlling an incident angle of the light for being incident the light emitted from the display panel on the total internal reflection surface.

4. The head mounted display device as claimed in claim 3, wherein the second tilted surface has a tilted angle W2 to the total internal reflection surface, for being satisfied in an equation, sin⁻

1n<

Ψ

, with referring refractivity of the prism as ‘

n’

, and the incident angle of the light ‘

Ψ

’

.

5. The head mounted display device as claimed in claim 4, wherein the first tilted surface has a tilted angle W1 to the total internal reflection surface is determined in satisfying an equation, W1=W2/2, so as to prevent an enlarged image from being deteriorated.

6. The head mounted display device as claimed in claim 2, wherein the prism is formed of transparent material.

7. The head mounted display device as claimed in claim 6, wherein the prism is formed of glass or plastic.

8. The head mounted display device as claimed in claim 2, wherein an air space is formed between the total internal reflection surface and the eyepiece lens.

9. The head mounted display device as claimed in claim 1, wherein the display panel is an LCD panel or an EL panel.

10. A head mounted display device comprising:

a pair of display panels respectively correspondent to the left and right eyes of an observer;

a signal processor controlling a signal applied to the display panel; and

a pair of tilted bar prism optics (TBPO) internally reflecting light emitted from the display panel in total, and displaying an enlarged virtual image in front of the eye of the observer.

11. The head mounted display device as claimed in claim 10, wherein the TBPO comprising;

a bar type prism formed of transparent material having

a total internal reflection surface internally reflecting the light emitted from the display panel in total,

a first tilted surface reflecting the light reflected by the total internal reflection surface to an eye of an observer,

a second tilted surface guiding the light emitted from the display panel to the total internal reflection surface in total,

an eyepiece lens opposing the total internal reflection surface, displaying an enlarged virtual image in front of the eye of the observer, and

an air space between the total internal reflection surface and the eyepiece lens.

12. The head mounted display device as claimed in claim 10, wherein the display panel is an LCD panel or an EL panel.