Direct backlight modules

• US 7,347,609 B2
• Filed: 12/08/2004
• Issued: 03/25/2008
• Est. Priority Date: 09/03/2004
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Yang, Cheng-Lin, Lai, Pong, Guo, Huang-Chen, Chung, Shuang-Chao
• Primary Examiner(s): Choi, Jacob Y.
• Application Number:
  US11/006,678
• Publication Number:
  US 20060050533A1
• Time in Patent Office: 1,203 Days
• Field of Search: 362/600, 362/607, 362/609, 362/611, 362/613, 362/614, 362/619, 362/620, 362/625, 362/626, 362/561
• US Class Current: 362/619
• CPC Class Codes: G02F 1/133507 Films for enhancing the luminance
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

Direct backlight modules are provided. A direct backlight module includes a liquid crystal panel, a plurality of light tubes disposed below the liquid crystal panel, a reflecting plate disposed below the light tubes, and a transparent plate disposed between the light tubes and the liquid crystal panel. Additionally, a lens array is formed on one surface of the transparent plate facing the light tubes and a prism array is formed on the other surface of the transparent plate facing the liquid crystal panel.

Claims

1. A direct backlight module, comprising:

a liquid crystal panel;

a plurality of light tubes disposed directly below the liquid crystal panel;

a reflecting plate disposed below the light tubes; and

a transparent plate, disposed between the light tubes and the liquid crystal panel, having;

a lens array, formed on the surface of the transparent plate and facing the light tubes, wherein the lens array comprises a plurality of first lens, and first lenses being half-circled, and a prism array, formed on the other surface of the transparent plate and facing the liquid crystal panel, wherein the prism array comprises a plurality of second lenses, the second lenses being triangular, said first and said second lenses having a same period, with each of the said first being align with one corresponding second lens, and the light passes the lens array and the prism array in sequence to be transmitted toward the liquid crystal panel.

2. The directed backlight module as claimed in claim 1, wherein the lens array is periodically arranged.

3. The direct backlight module as claimed in claim 1, wherein the prism array is periodically arranged.

4. The direct backlight module as claimed in claim 1, wherein the lens array extends along the same direction as the light tubes.

5. The direct backlight module as claimed in claim 1, wherein the prism array extends along the same direction as the light tubes.

6. The direct backlight module as claimed in claim 1, wherein the transparent plate comprises plastic.

7. The direct backlight module as claimed in claim 1, wherein a width of each first lens ranges from several microns to hundreds of microns.

8. The direct backlight module as claimed in claim 1, wherein a width of each second lens ranges from several microns to hundreds of microns.

9. The direct backlight module as claimed in claim 1, wherein a width of each first lens equals a width of each second lens.