LIGHT EMITTING MODULE AND DISPLAY DEVICE

• US 20160131814A1
• Filed: 08/23/2015
• Published: 05/12/2016
• Est. Priority Date: 11/12/2014
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: E Ink Holdings Incorporated
• Inventors: Tai, Sheng-Chieh, Chen, I-Jeng, Huang, Hsin-Tao
• Granted Patent: US 9,664,840 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 6/0013 Means for improving the coupling-in of light from the light source into the light guide coupling light into light guides in general G02B6/42
• CPC Class Codes: G02B 6/0023 provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence

Abstract

A light emitting module is provided. A light emitting unit includes a light emitting surface including a middle light emitting area and a peripheral light emitting area. The peripheral light emitting area is disposed on the opposite sides of the middle light emitting area. The light emitting unit emits light from the light emitting surface. A light guide plate includes a light incident surface adjacent to the middle light emitting area. The width of the light incident surface in a direction is smaller than the width of the light emitting surface in the direction, and the light incident surface is configured to receive part of the light that is emitted from the middle light emitting area, and another part of the light that is emitted from the peripheral light emitting area deviates from the light incident surface. A display device is also provided.

Claims

1. A light emitting module, comprising:

a light emitting unit, comprising a light emitting surface comprising a middle light emitting area and two peripheral light emitting areas, wherein the two peripheral light emitting areas are disposed at opposite sides of the middle light emitting area, and the light emitting unit emits a light beam from the light emitting surface; and

a light guide plate, comprising a light incident surface adjacent to the middle light emitting area, wherein a width of the light incident surface in a direction is smaller than a width of the light emitting surface in the direction, the light incident surface receives a part of the light beam emitted from the middle light emitting area, and another part of the light beam emitted from the two peripheral light emitting areas deviates from the light incident surface.

2. The light emitting module as claimed in claim 1, wherein the light emitting surface exceeds the light incident surface in the direction.

3. The light emitting module as claimed in claim 1, wherein the widths of the light emitting surface and the light incident surface in the direction meet

4. The light emitting module as claimed in claim 1, wherein an interval is between a middle point of the light emitting surface in the direction and a middle point of the light incident surface in the direction, and the interval is smaller than or equal to (h−

t)/2, where h is the width of the light emitting surface in the direction, and t is the width of the light incident surface in the direction.

5. The light emitting module as claimed in claim 1, further comprising a flexible printed circuit board electrically connected to the light emitting unit, wherein the light guide plate further comprises a first surface and a second surface, the light incident surface connects the first surface and the second surface, and the flexible printed circuit board is connected to a part of the first surface through an adhesive layer.

6. The light emitting module as claimed in claim 5, further comprising a light shielding layer, wherein the light emitting unit has a third surface connected to the light emitting surface adjacent to the second surface in the direction, the light shielding layer is adhered to a part of the second surface and the third surface through another adhesive layer, and a part of the light guide plate is located between the light shielding layer and the flexible printed circuit board.

7. The light emitting module as claimed in claim 1, wherein the light emitting module is a front light module.

8. A display device, comprising:

a display panel, comprising a display surface; and

a light emitting module, disposed beside the display surface, wherein the light emitting module comprises;

a light emitting unit, comprising a light emitting surface comprising a middle light emitting area and two peripheral light emitting areas, wherein the two peripheral light emitting areas are disposed at opposite sides of the middle light emitting area, and the light emitting unit emits a light beam from the light emitting surface; and

a light guide plate, comprising a light incident surface adjacent to the middle light emitting area, wherein a width of the light incident surface in a direction is smaller than a width of the light emitting surface in the direction, the light incident surface receives a part of the light beam emitted from the middle light emitting area, and another part of the light beam emitted from the two peripheral light emitting areas deviates from the light incident surface.

9. The display device as claimed in claim 8, wherein the light emitting surface exceeds the light incident surface in the direction.

10. The display device as claimed in claim 8, wherein the widths of the light emitting surface and the light incident surface in the direction meets:

11. The display device as claimed in claim 8, wherein an interval is between a middle point of the light emitting surface in the direction and a middle point of the light incident surface in the direction, and the interval is smaller than or equal to (h−

t)/2, where h is the width of the light emitting surface in the direction, and t is the width of the light incident surface in the direction.

12. The display device as claimed in claim 8, further comprising a flexible printed circuit board electrically connected to the light emitting unit, wherein the light guide plate further comprises a first surface and a second surface, the light incident surface connects the first surface and the second surface, and the flexible printed circuit board is connected to a part of the first surface through an adhesive layer.

13. The display device as claimed in claim 12, further comprising a light shielding layer, wherein the light emitting unit has a third surface connected to the light emitting surface adjacent to the second surface in the direction, the light shielding layer is adhered to a part of the second surface and the third surface through another adhesive layer, and a part of the light guide plate is located between the light shielding layer and the flexible printed circuit board.