Reflecting apparatus for backlight module of flat panel display

• US 20050007756A1
• Filed: 06/15/2004
• Published: 01/13/2005
• Est. Priority Date: 07/09/2003
• Status: Active Grant

• Current Assignee: CPT Technology (Group) Co., Ltd.
• Original Assignee: Chunghwa Picture Tubes Limited (Tatung Co., Ltd.)
• Inventors: Yu, Hong-Tien, Wu, Jin-Jei
• Granted Patent: US 7,178,962 B2
• Time in Patent Office: Days
• US Class Current: 362/609
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21V 7/09 with a combination of different curvatures
• CPC Class Codes: F21Y 2103/00 Elongate light sources, e.g. fluorescent tubes
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer

Abstract

A reflecting apparatus for a backlight module of a plane display is disclosed. The backlight module includes a light guide distal from the reflecting apparatus, and a plurality of diffusers. The apparatus comprises a light source, a reflector, and two substantially parallel sets of partially overlapped light deflectors wherein a gap exists between either two adjacent light deflectors of the same set or one light deflector and the reflector. A portion of emitted light is directed to the light guide after being reflected from the reflector. The remaining portion of light is directed to the light guide either after it has been deflected by the light deflectors or deflected by the light deflectors prior to being reflected by the reflector. Parallel light received at the light guide is deflected to the plane display as a backlight source of the plane display after passing the diffusers.

Claims

1. A reflecting apparatus for backlight module of plane display, the backlight module including a light guide distal from the reflecting apparatus and a plurality of diffusers, said reflecting apparatus comprising:

a light source;

a reflector having a concave surface and a focus on the light source; and

two substantially parallel sets of a plurality of light deflectors at one side of the reflector wherein a gap exists between either two adjacent light deflectors of the same set or one light deflector and the reflector,

wherein a portion of light emitted from the light source is directed to the light guide after being reflected from the reflector, a remaining portion of light is directed to the light guide after the remaining portion of light has been deflected by the light deflectors, and light received at the light guide is deflected to the plane display as a backlight source of the plane display after passing the diffusers.

2. The reflecting apparatus as claimed in claim 1, wherein a cross section of the reflector is a parabola.

3. The reflecting apparatus as claimed in claim 1, wherein the light reflector is a concave lens of either a cone or cylinder.

4. The reflecting apparatus as claimed in claim 1, wherein light is substantially parallel directed to the light guide.

5. The reflecting apparatus as claimed in claim 1, wherein light is deflected by the light deflectors prior to being reflected by the reflector.

6. The reflecting apparatus as claimed in claim 1, wherein each of the light deflectors is partially overlapped by one or two adjacent light deflectors of the same set.

7. The reflecting apparatus as claimed in claim 1, wherein the light source is a CCFL (cold cathode fluorescent lamp) or LED (light emitting diode).