[LIGHT GUIDE PLATE STRUCTURE AND BACK LIGHT MODULE]

• US 20050063657A1
• Filed: 11/06/2003
• Published: 03/24/2005
• Est. Priority Date: 09/23/2003
• Status: Active Grant

• Current Assignee: Intellectual Ventures I LLC (Intellectual Ventures LLC)
• Original Assignee: Transpacific IP Group Limited
• Inventors: Huang, Yao-Der, Chu, Wei-Kuang
• Granted Patent: US 7,443,462 B2
• Time in Patent Office: Days
• US Class Current: 385/129
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide

Abstract

A structure of a light guide plate comprising a light guide plate and a plurality of transparent elements is disclosed. The light guide plate comprises at least one light incident surface, a light scattering surface and a light emitting surface. The light scattering surface has a plurality of notches and these transparent elements are disposed therein. The transparent elements refractive index is different from that of the light guide plate. By disposing these transparent elements, the light scattering surface can improve light scattering effect. In addition, a back light module comprising a linear light source and a light guide plate structure mentioned above is also disclosed. The linear light source is disposed next to the light incident surface of the light guide plate.

Claims

1. A light guide plate structure applied to a back light module and adapted to transform a liner light source into a plate light source, the guide light source structure comprising:

a light guide plate, comprising at least one light incident surface, a light scattering surface and a light emitting surface, wherein the light incident surface is on a sidewall of the light guide plate, the light scattering surface is on a bottom surface of the light guide plate, the light emitting surface is on a top surface of the light guide plate, wherein the light scattering surface has a plurality of notches; and

a plurality of transparent elements, disposed within the plurality of notches, wherein a reflective index of the plurality of transparent elements is different from that of the light guide plate.

2. The light guide plate structure of claim 1, wherein the plurality of transparent elements is comprised of a glass or an acrylic material.

3. The light guide plate structure of claim 1, wherein the light guide plate is a mesa light guide plate, the plurality of transparent elements have different sizes, the plurality of transparent elements are disposed on the light scattering surface in sequence by the size thereof, and bottom surfaces of the plurality of transparent elements are substantially on a same surface.

4. A back light module adapted to provide a plate light source, the back light module comprising:

a light guide plate structure, comprising;

a light guide plate, comprising at least one light incident surface, a light scattering surface and a light emitting surface, wherein the light incident surface is on a sidewall of the light guide plate, the light scattering surface is on a bottom surface of the light guide plate, the light emitting surface is on a top surface of the light guide plate, and wherein the light scattering surface has a plurality of notches;

a plurality of transparent elements, disposed within the plurality of notches, wherein a reflective index of the plurality of transparent elements different from that of the light guide plate; and

a liner light source next to the light incident surface of the light guide plate, wherein light from the liner light source transmits the light incident surface and enters into the light guide plate, and the light scattering surface passes the light to the light emitting surfaces and out thereof.

5. The back light module of claim 4, wherein the plurality of transparent elements is comprised of a glass or an acrylic material.

6. The back light module of claim 4, wherein the light guide plate is a mesa light guide plate, the plurality of transparent elements have different sizes, the plurality of transparent elements are disposed on the light scattering surface in sequence by the size thereof, and bottom surfaces of the plurality of transparent elements are substantially on a same surface.