Light guide plate capable of controlling light-emitting angle and liquid crystal display therewith

• US 20030193630A1
• Filed: 02/21/2003
• Published: 10/16/2003
• Est. Priority Date: 04/10/2002
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Chiou, Yi-Shiuan
• Application Number:
  US10/375,871
• Publication Number:
  US 20030193630A1
• Time in Patent Office: Days
• US Class Current: 349/65
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side

Abstract

A light guide plate capable of controlling light-emitting angle. The light guide plate includes a plurality of recesses or protrusions, each recess or protrusion including a main axis, a circular plane perpendicular to the main axis, an arc lateral plane formed by an arc from a first included angle to a second included angle in respect to the main axis at a predetermined radius surrounding the main axis, wherein an edge of the arc lateral plane is connected to an edge of the circular plane, and a reflective film formed over the circular plane and the arc lateral plane. The light-emitting angle of the light guide plate is regulated by the first and second included angles, thereby increasing view angle of a liquid crystal display device.

Claims

1. A light guide plate capable of controlling light-emitting angle, comprising:

a body having a light-emitting plane, a light-reflecting plane with a plurality of recesses and a light-receiving plane, each recess having;

a main axis;

a circular plane perpendicular to the main axis;

an arc lateral plane, formed by an arc from a first included angle to a second included angle in respect to the main axis at a predetermined radius surrounding the main axis, wherein an edge of the arc lateral plane is connected to an edge of the circular plane; and

a reflective film, formed over the circular plane and the arc lateral plane.

2. The light guide plate of claim 1, wherein the light-emitting angle of the light guide plate is regulated by said first included angles and said second included angles.

3. A light guide plate capable of controlling light-emitting angle, comprising:

a body having a light-emitting plane, a light-reflecting plane with a plurality of protrusions and a light-receiving plane, each protrusion having;

a main axis;

a circular plane perpendicular to the main axis;

an arc lateral plane, formed by an arc from a first included angle to a second included angle in respect to the main axis at a predetermined radius surrounding the main axis, wherein an edge of the arc lateral plane is connected to an edge of the circular plane; and

a reflective film, formed over the circular plane and the arc lateral plane.

4. The light guide plate of claim 3, wherein light-emitting angle of the light guide plate is regulated by said first included angles and second included angles.

5. A liquid crystal display device, comprising:

a light guide plate having a light-emitting plane, a light-reflecting plane with a plurality of recesses and a light-receiving plane;

a liquid crystal panel disposed adjacent to the light-emitting plane;

a reflector disposed adjacent to the light-reflecting plane; and

a lamp disposed facing the light-receiving plane in order to emit light at a predetermined angle, each recess having;

a main axis;

a circular plane perpendicular to the main axis;

an arc lateral plane, formed by an arc from a first included angle to a second included angle in respect to the main axis at a predetermined radius surrounding the main axis, wherein an edge of the arc lateral plane is connected to an edge of the circular plane; and

a reflective film, formed over the circular plane and the arc lateral plane.

6. The liquid crystal display device of claim 5, wherein light-emitting angle of the light guide plate is regulated by said first included angles and said second included angles.

7. The liquid crystal display device of claim 5, further comprising a diffusing means located between the liquid crystal panel and the light guide plate.

8. The liquid crystal display device of claim 7, wherein the diffusing means comprises a protecting film, a prism sheet and a diffusing sheet, wherein the protecting film is disposed over the light guide plate.

9. A liquid crystal display device, comprising:

a light guide plate having a light-emitting plane, a light-reflecting plane with a plurality of protrusions and a light-receiving plane;

a liquid crystal panel disposed adjacent to the light-emitting plane;

a reflector disposed adjacent to the light-reflecting plane; and

a lamp disposed facing the light-receiving plane in order to emit light at a predetermined angle, each protrusion having;

a main axis;

a circular plane perpendicular to the main axis;

an arc lateral plane, formed by an arc from a first included angle to a second included angle in respect to the main axis at a predetermined radius surrounding the main axis, wherein an edge of the arc lateral plane is connected to an edge of the circular plane; and

a reflective film, formed over the circular plane and the arc lateral plane.

10. The liquid crystal display device of claim 9, wherein light-emitting angle of the light guide plate is regulated by said first included angles and said second included angles.

11. The liquid crystal display device of claim 9, further comprising a diffusing means located between the liquid crystal panel and the light guide plate.

12. The liquid crystal display device of claim 11, wherein the diffusing means comprises a protecting film, a prism sheet and a diffusing sheet, wherein the protecting film is disposed over the light guide plate.