LIGHTING SYSTEM FOR THIN REFLECTIVE DISPLAY DEVICES

• US 20080298084A1
• Filed: 05/30/2007
• Published: 12/04/2008
• Est. Priority Date: 05/30/2007
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Wen, Chien-Hui, Carlson, Mark J., Emmert, Steve C., Pei, Yi-Lin, Yang, Sen, Elfering, James P.
• Application Number:
  US11/755,421
• Publication Number:
  US 20080298084A1
• Time in Patent Office: Days
• US Class Current: 362/607
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area

Abstract

A display for a mobile communication device is disclosed. The display may include a first layer with refractive index n₁, having at least a rough surface on one side, a second layer, having refractive index n₂, applied contiguously on a side opposite from the rough side of the first layer, wherein n₁>n₂>n_air and n_air, is the refractive index in air media, a reflective display disposed on a side of the second layer opposite from the first layer, and at least one light source located adjacent to at least one edge or side of the first layer.

Claims

1. A display for a mobile communication device, comprising:

a first layer with refractive index n₁, having at least a rough surface on one side;

a second layer, having refractive index n₂, applied contiguously on a side opposite from the rough side of the first layer, wherein n₁>

n₂>

n_air and n_air is the refractive index in air media;

a reflective display disposed on a side of the second layer opposite from the first layer; and

at least one light source located adjacent to at least one edge or side of the first layer.

2. The display of claim 1, wherein the second layer is one of an optically clear adhesive and a transparent film.

3. The display of claim 1, wherein the second layer is coated directly onto the first layer.

4. The display of claim 1, wherein the at least one light source is a light guide extending the entire length of at least one edge of the first layer.

5. The display of claim 1, wherein 1.5<

n₁≦

1.9, and 1.2≦

n₂≦

1.5.

6. The display of claim 1, wherein 1.6≦

n₁≦

1.85, and 1.3≦

n₂≦

1.5.

7. The display of claim 1, wherein a thickness of the first layer is between 0.10 to 0.5 millimeters.

8. A mobile communication device, comprising:

a casing for housing components of the mobile communication device; and

a display housed inside the casing, comprising;

a first layer with refractive index n₁, having at least a rough surface on one side;

a second layer, having refractive index n₂, applied contiguously on a side opposite from the rough side of the first layer, wherein n₁>

n₂>

n_air is the refractive index in air media;

a reflective display disposed on a side of the second layer opposite from the first layer; and

at least one light source located adjacent to at least one edge of the first layer.

9. The mobile communication device of claim 8, wherein the second layer is one of an optically clear adhesive and a transparent film.

10. The mobile communication device of claim 8, wherein the second layer is coated directly onto the first layer.

11. The mobile communication device of claim 8, wherein 1.5<

n₁≦

1.9, and 1.2≦

n₂≦

1.5.

12. The mobile communication device of claim 8, wherein 1.6≦

n₁≦

1.85, and 1.3≦

n₂≦

1.5.

13. The mobile communication device of claim 8, wherein a thickness of the first layer is between 0.10 to 0.5 millimeters.

14. The mobile communication device of claim 8, wherein at least one light source is a light guide extending the entire length of at least one edge of the first layer.

15. The mobile communication device of claim 8, wherein the mobile communication device may be one of a portable MP3 player, satellite radio receiver, AM/FM radio receiver, satellite television, portable music player, e-book, portable laptop, portable computer, wireless radio, wireless telephone, portable digital video recorder, cellular telephone, mobile telephone, and personal digital assistant.

16. A method of fabricating a display for a mobile communication device, comprising:

applying a contiguous second layer having refractive index n₂, on a side of a first layer having refractive index n₁ opposite a side having the rough surface, wherein n₁>

n₂>

and n_air is the refractive index in air media;

disposing a reflective display on a side of the second layer opposite the first layer; and

disposing at least one light source at adjacent to at least one edge of the first layer.

17. The method of claim 16, wherein the second layer is one of an optically clear adhesive and a transparent film.

18. The method of claim 16, wherein the second layer is applied directly onto the first layer.

19. The method of claim 16, wherein 1.5<

n₁≦

1.9, and 1.2≦

n₂≦

1.5.

20. The method of claim 16, wherein 1.6≦

n₁≦

1.85, and 1.3≦

n₂≦

1.5.