LIGHT SOURCE MODULE AND DISPLAY DEVICE

• US 20150226898A1
• Filed: 11/28/2014
• Published: 08/13/2015
• Est. Priority Date: 02/10/2014
• Status: Active Grant

• Current Assignee: E Ink Holdings Incorporated
• Original Assignee: E Ink Holdings Incorporated
• Inventors: Shih, Yao-Tsung, Chang, Mei-Chen
• Granted Patent: US 9,733,418 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 6/005 provided by one optical element, or plurality thereof, placed on the light output side of the light guide
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources

Abstract

A light source module is provided. At least one light-emitting device emits light and is disposed beside the light guide plate. A light guide plate includes a first surface, a second surface being opposite to the first surface and a light-entering surface connecting the first surface with the second surface. At least one first light guide end, which is located in front of the light-emitting device, and at least one second light guide end, which is connected to the first light guide end, are located on a side of the light guide plate where the light-entering surface is located. A first light-transmitting medium at least located at the first light guide end on the first surface has a refractive index which is larger then a refractive index of a medium or space located at the second light guide end on the first surface. A display device is also provided.

Claims

1. A light source module, comprising:

at least one light emitting device, adapted to emit at least one light beam;

a light guide plate, wherein the at least one light emitting device is disposed beside the light guide plate, the light guide plate comprising;

a first surface;

a second surface, being opposite to the first surface; and

a light-entering surface, connected with the first surface and the second surface;

at least one first light guide end, located on one side of the light guide plate where the light-entering surface is located and located in front of the at least one light emitting device;

at least one second light guide end, located on the side of the light guide plate where the light-entering surface is located and connected with the at least one first light guide end; and

a first light-transmitting medium, disposed at the at least one first light guide end on the first surface and having a refractive index greater than a refractive index of a medium or space located at the at least one second light guide end on the first surface.

2. The light source module according to claim 1, wherein the at least one light emitting device is a plurality of light emitting devices, the at least one first light guide end is a plurality of first light guide ends, and the first light guide ends and the second light guide ends are arranged alternately along the light-entering surface.

3. The light source module according to claim 1, further comprising:

a second light-transmitting medium, wherein the second light-transmitting medium is a medium located at the at least one second light guide end on the first surface and connected with the first light-transmitting medium.

4. The light source module according to claim 3, wherein the second light-transmitting medium is a light-transmitting adhesive layer.

5. The light source module according to claim 1, wherein the medium located at the at least one second light guide end on the first surface is air, gas or liquid.

6. The light source module according to claim 1, wherein the light guide plate has an active area, and the distance between an edge of the active area, which is adjacent to the light-entering surface, and the at least one light emitting device is 0 to 0.5 mm along a direction parallel to the first surface.

7. The light source module according to claim 1, further comprising:

a protection cover plate, disposed above the first surface or the second surface.

8. The light source module according to claim 1, further comprising:

a third light-transmitting medium, at least disposed at the at least one first light guide end on the second surface and having a refractive index greater than a refractive index of a medium or space located at the at least one second light guide end on the second surface.

9. The light source module according to claim 8, wherein the third light-transmitting medium is further disposed in a region outside the at least one first light guide end and the at least one second light guide end on the second surface.

10. The light source module according to claim 8, further comprising:

a fourth light-transmitting medium, wherein the fourth light-transmitting medium is a medium located at the at least one second light guide end on the second surface and connected with the third light-transmitting medium.

11. The light source module according to claim 1, wherein the first light-transmitting medium is a light-transmitting adhesive layer.

12. The light source module according to claim 1, wherein the first light-transmitting medium is further disposed in a region outside the at least one first light guide end and the at least one second light guide end on the first surface.

13. The light source module according to claim 1, wherein the first light-transmitting medium has a refractive index less than a refractive index of the light guide plate.

14. A display apparatus, comprising:

a display panel; and

a light source module, disposed on the display panel and comprising;

at least one light emitting device, adapted to emit at least one light beam; and

a light guide plate, wherein the at least one light emitting device is disposed beside the light guide plate, the light guide plate comprising;

a first surface;

a second surface, being opposite to the first surface, wherein one of the first surface and the second surface faces toward the display panel, and the other of the the first surface and the second surface faces the display panel with the back; and

a light-entering surface, connected with the first surface and the second surface;

at least one first light guide end, located on one side of the light guide plate where the light-entering surface is located and located in front of the at least one light emitting device;

at least one second light guide end, located on the side of the light guide plate where the light-entering surface is located and connected with the at least one first light guide end; and

a first light-transmitting medium, disposed at the at least one first light guide end on the first surface and having a refractive index larger then a refractive index of a medium or space located at the at least one second light guide end on the first surface.

15. The display apparatus according to claim 14, wherein the at least one light emitting device is a plurality of light emitting devices, the at least one light guide end is a plurality of first light guide ends, and the first light guide ends and the second light guide ends are arranged alternately along the light-entering surface.

16. The display apparatus according to claim 14, further comprising:

a second light-transmitting medium, wherein the second light-transmitting medium is a medium located at the at least one second light guide end on the first surface and connected with the first light-transmitting medium.

17. The display apparatus according to claim 16, wherein the second light-transmitting medium is a light-transmitting adhesive layer.

18. The display apparatus according to claim 14, wherein the medium located at the at least one second light guide end on the first surface is air, gas or liquid.

19. The display apparatus according to claim 14, wherein the light guide plate has an active area, and the distance between an edge of the active area, which is adjacent to the light-entering surface, and the at least one light emitting device is 0 to 0.5 mm along a direction parallel to the first surface.

20. The display apparatus of claim 14, further comprising:

a protection cover plate, wherein the light guide plate is disposed between the protection cover plate and the display panel.

21. The display apparatus of claim 14, further comprising:

a third light-transmitting medium, at least disposed at the at least one first light guide end on the second surface and having a refractive index greater than a refractive index of a medium or space located at the at least one second light guide end on the second surface.

22. The display apparatus according to claim 21, wherein the third light-transmitting medium is further disposed in a region outside the at least one first light guide end and the at least one second light guide end on the second surface.

23. The display apparatus according to claim 21, further comprising:

a fourth light-transmitting medium, wherein the fourth light-transmitting medium is a medium located at the at least one second light guide end on the second surface and connected with the third light-transmitting medium.

24. The display apparatus according to claim 14, wherein the first light-transmitting medium is a light-transmitting adhesive layer.

25. The display apparatus according to claim 14, wherein the first light-transmitting medium is further disposed in a region outside the at least one first light guide end and the at least one second light guide end on the first surface.

26. The display apparatus according to claim 14, wherein the display panel is a reflective display panel.

27. The light source module according to claim 14, wherein the first light-transmitting medium has a refractive index less than a refractive index of the light guide plate.