Backlight unit for liquid crystal display

• US 7,839,466 B2
• Filed: 09/23/2005
• Issued: 11/23/2010
• Est. Priority Date: 10/19/2004
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: Chi Mei Optoelectronics (InnoLux Corporation)
• Inventors: Hung, ChenPin, Shih, ChingWen
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): Nguyen; Lauren
• Application Number:
  US11/233,011
• Publication Number:
  US 20060132672A1
• Time in Patent Office: 1,887 Days
• Field of Search: 349/61, 349/62, 349/64, 349/66
• US Class Current: 349/64
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity

Abstract

A backlight unit to effectively prevent generation of double images, having a frame, a plurality sets of light sources, at least one isolator and one diffuser. The light source sets are located within the frame and are individually driven periodically. The isolator is disposed at the bottom of the frame between adjacent light source sets. The diffuser is located on top of the frame over the light source sets and the isolator with a height larger than or equal to half the distance between the diffuser and the bottom of the frame.

Claims

1. A liquid crystal display, comprising:

a liquid crystal panel; and

a backlight unit including;

a frame;

a plurality of light source sets mounted within the frame;

a plurality of isolators, wherein between pairs of adjacent light source sets there is one of said isolators installed for suppressing interference between said pair of adjacent light source sets, wherein each of the isolators includes

a first isolation part, which has a first side surface and a second, opposite side surface and is mounted on a bottom surface of the frame, and

a second isolation part, which has a third side surface and a fourth, opposite side surface and is mounted on the first isolation part; and

a diffuser disposed on a top surface of the frame over the light source sets and the isolators,

wherein the distance between a top of each of the isolators and the bottom surface of the diffuser is smaller than one half of the distance between the diffuser and the bottom surface of the frame;

each of the isolators has a height less than a height of the frame between the top surface and the bottom surface thereof, and

the diffuser is disposed on the frame over the light source sets and the isolators without being supported from below, either directly or indirectly, by any of the isolators.

2. The liquid crystal display of claim 1, wherein each of the isolators has a cross sectional area that gradually decreases away from the bottom surface of the frame.

3. The liquid crystal display of claim 1, further comprising a lining block located between each of the isolators and the bottom surface of the frame.

4. The liquid crystal display of claim 1, wherein only one of the first and second isolation parts has the respective side surfaces, upon which light from the adjacent light source sets is incident in use, that are reflective.

5. The backlight unit of claim 1, wherein the top of each of the isolators is free of direct contact with any other component of the backlight unit.

6. The liquid crystal display of claim 1, wherein the light source sets and the isolators are alternatingly and evenly distributed in the frame.

7. The liquid crystal display of claim 1, wherein light emitted from any of the light source sets is prevented from propagating to display areas corresponding to other light source sets to suppress double image generation.