WAVEGUIDE DEVICE FOR PLANAR DISPLAY DEVICE AND RELATED PLANAR DISPLAY DEVICE

• US 20070081783A1
• Filed: 09/28/2005
• Published: 04/12/2007
• Est. Priority Date: 09/28/2005
• Status: Abandoned Application

• Current Assignee: Chunghwa Picture Tubes Limited
• Original Assignee: Chunghwa Picture Tubes Limited
• Inventors: Chou, Ming-Der, Cheng, Yi-Kai, Chung, Sen-Nien, Chen, Jyh-Long
• Application Number:
  US11/162,912
• Publication Number:
  US 20070081783A1
• Time in Patent Office: Days
• US Class Current: 385/146
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/003 Lens or lenticular sheet or layer
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide

Abstract

A waveguide device used for a planar display device having an image source for emitting modulated light beams and a display panel for displaying an image. The waveguide device includes a slab waveguide having a light entrance plane and a light exit plane, a lens array comprising a plurality of lenses disposed in the form of a matrix for individually tuning and guiding corresponding modulated light beams to desired positions on the light entrance plane of the slab waveguide, a wedge waveguide for receiving modulated light beams emitted from the light exit plane of the slab waveguide and emitting the received modulated light beams to the display panel to form the image, and a fixing device for fixing the wedge waveguide to the slab waveguide.

Claims

1. A waveguide device for a planar display device, the planar display device comprising:

an image source for emitting a plurality of modulated light beams disposed in the form of a matrix; and

a display panel for displaying an image;

the waveguide device comprising;

a slab waveguide comprising a light entrance plane and a light exit plane opposite to the light entrance plane;

a lens array comprising a plurality of lens units corresponding to the modulated light beams and disposed in the form of a matrix, each of the lens units able to tune and guide a corresponding modulated light beam to project onto a predetermined position of the light entrance plane of the slab waveguide;

a wedge waveguide comprising;

a light entrance plane for receiving modulated light beams emitted from the light exit plane of the slab waveguide; and

a light exit plane installed on a side of the display panel for projecting modulated light beams received by the light entrance plane of the wedge waveguide onto the display panel, so as to form the image on the display panel; and

a fixing device for fixing the wedge waveguide to the slab waveguide.

2. The waveguide device of claim 1 further comprising a Dyson catadioptric system installed near the light exit plane of the slab waveguide and the light entrance plane of the wedge waveguide for refracting and reflecting the modulated light beams emitted from the light exit plane of the slab waveguide to the light entrance plane of the wedge waveguide.

3. The waveguide device of claim 1 further comprising an Offner catadioptric system installed near the light exit plane of the slab waveguide and the light entrance plane of the wedge waveguide for refracting and reflecting the modulated light beams emitted from the light exit plane of the slab waveguide to the light entrance plane of the wedge waveguide.

4. A planar display device comprising:

an image source for emitting a plurality of modulated light beams disposed in the form of a matrix;

a display panel for displaying an image;

a slab waveguide comprising a light entrance plane and a light exit plane opposite to the light entrance plane;

a lens array comprising a plurality of lens units corresponding to the modulated light beams and disposed in the form of a matrix, each of the lens units able to tune and guide a corresponding modulated light beam to project onto a predetermined position of the light entrance plane of the slab waveguide;

a wedge waveguide comprising;

a light entrance plane for receiving modulated light beams emitted from the light exit plane of the slab waveguide; and

a light exit plane installed on a side of the display panel for projecting modulated light beams received by the light entrance plane of the wedge waveguide onto the display panel, so as to form the image on the display panel; and

a fixing device for fixing the wedge waveguide to the slab waveguide.

5. The planar display device of claim 4 further comprising a Dyson catadioptric system installed near the light exit plane of the slab waveguide and the light entrance plane of the wedge waveguide for refracting and reflecting the modulated light beams emitted from the light exit plane of the slab waveguide to the light entrance plane of the wedge waveguide.

6. The planar display device of claim 4 further comprising an Offner catadioptric system installed near the light exit plane of the slab waveguide and the light entrance plane of the wedge waveguide for refracting and reflecting the modulated light beams emitted from the light exit plane of the slab waveguide to the light entrance plane of the wedge waveguide.

7. The planar display device of claim 4, wherein the image source comprises:

a light source for emitting light; and

a digital micro-mirror device comprising a plurality of micro-mirrors disposed in the form of a matrix for reflecting the light emitted from the light source and forming the modulated light beams.

8. The planar display device of claim 4, wherein the image source is a digital light processor (DLP).

9. The planar display device of claim 4, wherein the image source is a liquid crystal display (LCD).

10. The planar display device of claim 4, wherein the image source is a liquid-crystal-on-silicon (LCOS) device.