Reflector and Backlight Device

• US 20080297459A1
• Filed: 01/14/2005
• Published: 12/04/2008
• Est. Priority Date: 01/15/2004
• Status: Active Grant

• Current Assignee: Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Original Assignee: Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Inventors: Sugimoto, Yasushi, Teshima, Teruo
• Granted Patent: US 8,179,361 B2
• Time in Patent Office: Days
• US Class Current: 345/102
• CPC Class Codes: G02B 5/09 Multifaceted or polygonal mirrors , e.g. polygonal scanning mirrors; Fresnel mirrors

Abstract

A back light device realizing improvement in hotspots and bright line in the region of light incidence and of darkness arising in between light sources is provided by forming the reflective surface of the reflector as a structured face comprising an iteration of prism elements of trapezoidal section.

Claims

1. A reflector comprising a structured face that includes an iteration of prism elements of trapezoidal section.

2. The reflector according to claim 1 wherein the height of the section of the prism elements is constant.

3. The reflector according to claim 1 wherein the height of the section of the prism elements is decreasing progressively.

4. A backlight device comprising:

a light guide plate that propagates, reflects and diffuses light, disposed at the rear surface side of a display device;

a light source disposed at at least one end of the light guide plate; and

a reflector that reflects light from the light guide plate, disposed at the lower phase of the light guide plate;

wherein the reflector is the reflector according to claim 1.

5. The backlight device according to claim 4 using a light guide plate having reflective elements integratedly formed on the surface adjacent to a liquid crystal display device, that emits light rays by means of these reflective elements in the direction of a reflector adjacent to that face of the light guide plate opposing the side of the light guide plate nearest to the liquid crystal display device.

6. The backlight device according to claim 5 wherein an anisotropic diffusion pattern is formed on the surface of the light guide plate opposing the surface on which the reflective elements are integratedly formed.

7. A backlight device comprising:

a light guide plate that propagates, reflects and diffuses light, disposed at the rear surface side of a display device;

a light source disposed at at least one end of the light guide plate; and

a reflector that reflects light from the light guide plate, disposed at the lower phase of the light guide plate;

wherein the reflector is the reflector according to claim 2.

8. A backlight device comprising:

a light guide plate that propagates, reflects and diffuses light, disposed at the rear surface side of a display device;

a light source disposed at at least one end of the light guide plate; and

a reflector that reflects light from the light guide plate, disposed at the lower phase of the light guide plate;

wherein the reflector is the reflector according to claim 3.