Backlight module

• US 7,494,234 B2
• Filed: 05/24/2006
• Issued: 02/24/2009
• Est. Priority Date: 08/05/2005
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Chang, Jen-Tsorng
• Primary Examiner(s): Negron; Ismael
• Assistant Examiner(s): Dunn; Danielle
• Application Number:
  US11/440,378
• Publication Number:
  US 20070030566A1
• Time in Patent Office: 1,007 Days
• Field of Search: None
• US Class Current: 362/19
• CPC Class Codes: G02B 27/285 comprising arrays of elements, e.g. microprisms

Abstract

A polarizer includes a first prism plate having a plurality of first micro-prisms; a polarizing film formed on surfaces of the first micro-prisms; and a second prism plate having a plurality of second micro-prisms, the micro-prisms of the first prism plate and the micro-prisms of the second prism plate meshed with each other and integrated the polarizing film therebetween, the polarizing film being in direct contact with the first prism plate and the second prism plate. Furthermore, a method for manufacturing the polarizer and a backlight module using the polarizer is also provided.

Claims

1. A backlight module comprising:

a light guide plate, the light guide plate comprising a light incident surface, a light emitting surface adjoining the light incident surface, and a bottom surface opposite to the light emitting surface;

a light source placed next to the light incident surface;

a polarizer, the polarizer comprising a first prism plate having a plurality of first micro-prisms;

a polarizing film formed on surfaces of the first micro-prisms; and

a second prism plate having a plurality of second micro-prisms, the first micro-prisms of the first prism plate and the second micro-prisms of the second prism plate meshed with each other with the polarizing film integrated therebetween, the polarizing film being in direct contact with the first prism plate and the second prism plate;

a reflector; and

a quarter wave plate;

wherein

the polarizer, the light guide plate, the quarter wave plate, and the reflector are stacked continuously in that order from top to bottom.

2. The backlight module in accordance with claim 1, wherein the first and second prism plates are made from essentially the same material.

3. The backlight module in accordance with claim 1, wherein the first and second prism plates are both made from glass material.

4. The backlight module in accordance with claim 1, wherein the first and second prism plates are both made from transmission plastic material.

5. The backlight module in accordance with claim 1, wherein the micro-prisms each have a 90 degree apex angle.

6. The backlight module in accordance with claim 1, wherein the polarizing film is made from a material selected from the group comprising MgF2, SiO2, and Ta2O5.

7. The backlight module in accordance with claim 1, wherein the light emitting surface of the light guide plate has a plurality of microstructure formed thereon.

8. The backlight module in accordance with claim 1, wherein the reflector is a reflective sheet.

9. The backlight module in accordance with claim 1, wherein the quarter wave plate comprises a first surface far from the light guide plate and the reflector is a reflective film formed on the first surface of the quarter wave plate.