HYBRID LIGHT GUIDE PLATE AND DISPLAY DEVICE

• US 20140029295A1
• Filed: 07/26/2013
• Published: 01/30/2014
• Est. Priority Date: 07/26/2012
• Status: Active Grant

• Current Assignee: Coretronic Corporation
• Original Assignee: Young Lighting Technology Inc. (Coretronic Corporation)
• Inventors: Hsiao, Chun-Chung, Chen, Shih-Chang, Shiau, Tzeng-Ke, Li, Cheng-Tsung
• Granted Patent: US 9,798,061 B2
• Time in Patent Office: Days
• US Class Current: 362/606
• CPC Class Codes: G02B 6/0011 the light guides being planar or of plate-like form
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• 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 6/0088 of the light guide or other optical sheets in the package
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133317 Intermediate frames, e.g. between backlight housing and front frame
• CPC Class Codes: G02F 1/133615 Edge-illuminating devices, i.e. illuminating from the side

Abstract

A display device includes a housing, a frame bonded to the housing, and a display module. The display module includes a back cover bonded to the frame, a light guide plate (LGP), a support element, a display panel, and an optical film set. The LGP is supported on the back cover and has a light exiting surface and an opposite back surface. At least two sides of the LGP'"'"'s back surface are adhered on the back cover, and the LGP is made of glass. The support element and display panel are supported respectively on the LGP and support element. The optical film set is between the display panel and LGP. A hybrid LGP includes a first light guide sub-plates and a second light guide sub-plate. The second light guide sub-plate is stacked on and bonded to the first light guide sub-plate.

Claims

1. A display device, comprising:

a housing;

a frame, bonded to the housing; and

a display module, comprising;

a back cover, bonded to the frame;

a light guide plate, supported on the back cover and having a light exiting surface and a back surface opposite to the light exiting surface, wherein at least two sides of the back surface of the light guide plate are adhered on the back cover, and material of the light guide plate is glass;

a support element, supported on the light guide plate;

a display panel, supported on the support element; and

an optical film set, disposed between the display panel and the light guide plate.

2. The display device as claimed in claim 1, wherein the housing and the back cover enclose the light guide plate, the support element, the display panel, and the optical film set.

3. The display device as claimed in claim 1, wherein the housing is a front frame and exposes a display surface of the display panel.

4. The display device as claimed in claim 1, wherein Young'"'"'s modulus of the back cover is greater than 40 Gpa.

5. The display device as claimed in claim 1, wherein a thickness of the back cover is less than 0.5 mm.

6. The display device as claimed in claim 1, wherein a gap between the back cover and the light guide plate is less than 0.1 mm.

7. The display device as claimed in claim 1, wherein Young'"'"'s modulus of the light guide plate is greater than 40 Gpa.

8. The display device as claimed in claim 1, wherein the display panel has a display surface and an effective display region, a reference line extends from a boundary of the effective display region on the display surface to outside the effective display region, the reference line is perpendicular to the boundary, an included angle between the reference line and a normal direction of the effective display region is 45°

, and an end of the light guide plate extends out of the effective display region and across the reference line.

9. The display device as claimed in claim 8, wherein the support element has a recess, and the end of the light guide plate extends into the recess and supports the support element.

10. The display device as claimed in claim 8, wherein the support element has a slot, and the end of the light guide plate goes through the slot and supports the support element.

11. The display device as claimed in claim 1, further comprising a plurality of conductive wires, wherein the conductive wires are disposed on the frame.

12. The display device as claimed in claim 1, wherein a thickness of the display device is less than 4 mm.

13. The display device as claimed in claim 1, further comprising a light source, wherein the light source is disposed on the back cover and adjacent to a light incidence side of the light guide plate.

14. The display device as claimed in claim 13, wherein the light source has a light-emitting surface, the light guide plate has two chamfers, one of the chamfers is connected to the light incidence side and the light exiting surface, the other chamfer is connected to the light incidence side and the back surface, and height of the light-emitting surface of the light source is the same as height of the light incidence side of the light guide plate.

15. The display device as claimed in claim 14, further comprising an optical adhesive, wherein the light-emitting surface of the light source, the light incidence side of the light guide plate, and the chamfers are connected to each other through the optical adhesive.

16. The display device as claimed in claim 1, wherein a reflective sheet is disposed under the back surface of the light guide plate.

17. The display device as claimed in claim 1, wherein the support element is an elastic buffer material.

18. A hybrid light guide plate, comprising:

at least one first light guide sub-plate; and

at least one second light guide sub-plate, wherein the second light guide sub-plate is stacked on the first light guide sub-plate and bonded to the first light guide sub-plate, and ratio of the thickness of the first light guide sub-plate over the thickness of the second light guide sub-plate falls within a range greater than or equal to 0.2 and less than or equal to 5.

19. The hybrid light guide plate as claimed in claim 18, wherein material of the first light guide sub-plate is glass and material of the second light guide sub-plate is plastic.

20. The hybrid light guide plate as claimed in claim 18, wherein an absolute value of a difference between refractive indices of the materials of the first light guide sub-plate and the second light guide sub-plate is less than 0.05.

21. The hybrid light guide plate as claimed in claim 18, wherein mechanical strength of the first light guide sub-plate is greater than mechanical strength of the second light guide sub-plate, and optical absorption rate of the first light guide sub-plate is greater than optical absorption rate of the second light guide sub-plate.

22. The hybrid light guide plate as claimed in claim 18, wherein uniformity of the optical absorption rates of the first light guide sub-plate relatively to different wavelengths in the visible light is less than uniformity of the optical absorption rates of the second light guide sub-plate relatively to the different wavelengths in the visible light.

23. The hybrid light guide plate as claimed in claim 18, further comprising at least one transparent connection layer, and the first light guide sub-plate and the second light guide sub-plate are connected to each other through the transparent connection layer.

24. The hybrid light guide plate as claimed in claim 18, wherein the first light guide sub-plate and the second light guide sub-plate contact each other.

25. The hybrid light guide plate as claimed in claim 18, further comprising at least one third light guide sub-plate, wherein the third light guide sub-plate is bonded onto the first light guide sub-plate, onto the second light guide sub-plate or between the first light guide sub-plate and the second light guide sub-plate.

26. The hybrid light guide plate as claimed in claim 18, further comprising a plurality of scattering microstructures disposed on at least one of the first light guide sub-plate and the second light guide sub-plate.

27. The hybrid light guide plate as claimed in claim 26, wherein the scattering microstructure is fabricated by using an ink printing process, an ink-jetting process or a photolithography process.

28. The hybrid light guide plate as claimed in claim 27, wherein prior to the ink-jetting process, a plasma process is performed to fabricate a hydrophobic layer on a surface of at least one of the first light guide sub-plate and the second light guide sub-plate.

29. A display device, comprising:

a housing;

a frame, bonded to the housing; and

a display module, comprising;

a back cover, bonded to the frame;

a hybrid light guide plate, supported on the back cover and having a light exiting surface and a back surface opposite to the light exiting surface, wherein at least two sides of the back surface of the hybrid light guide plate are adhered on the back cover;

a support element, supported on the hybrid light guide plate;

a display panel, supported on the support element; and

an optical film set, disposed between the display panel and the hybrid light guide plate.

30. The display device as claimed in claim 29, further comprising a reflective sheet disposed between the back surface and the back cover, wherein the reflective sheet is supported on the back cover and the hybrid light guide plate is supported on the reflective sheet.

31. The display device as claimed in claim 29, wherein the hybrid light guide plate comprises at least one first light guide sub-plate and at least one second light guide sub-plate, and ratio of thickness of the first light guide sub-plate over thickness of the second light guide sub-plate falls within a range greater than or equal to 0.2 and less than or equal to 5.

32. The display device as claimed in claim 29, wherein thickness of the hybrid light guide plate is greater than or equal to thickness of the back cover.

33. The display device as claimed in claim 32, wherein thickness of the hybrid light guide plate falls within a range greater than or equal to 0.2 mm and less than or equal to 3 mm and thickness of the back cover falls within a range greater than or equal to 0.1 mm and less than or equal to 3 mm.

34. A display device, comprising:

a transparent plate; and

a display module, comprising;

a back cover, bonded to the transparent plate;

a light guide plate, supported on the back cover and having a light exiting surface and a back surface opposite to the light exiting surface, wherein at least two sides of the back surface of the light guide plate are adhered on the back cover;

a support element, supported on the back cover and disposed between the transparent plate and the back cover;

a display panel, connected to the transparent plate through an optical adhesive; and

an optical film set, disposed between the display panel and the light guide plate.

35. The display device as claimed in claim 34, wherein the transparent plate and the back cover enclose the light guide plate, the support element, the display panel, and the optical film set.

36. The display device as claimed in claim 34, wherein the light guide plate is a glass light guide plate or a hybrid light guide plate.

37. The display device as claimed in claim 36, wherein the hybrid light guide plate has at least one first light guide sub-plate and at least one second light guide sub-plate, the second light guide sub-plate is stacked on the first light guide sub-plate and bonded to the first light guide sub-plate, wherein material of the first light guide sub-plate is glass and material of the second light guide sub-plate is plastic.

38. The display device as claimed in claim 36, wherein the hybrid light guide plate has at least one first light guide sub-plate and at least one second light guide sub-plate, the second light guide sub-plate is stacked on the first light guide sub-plate and bonded to the first light guide sub-plate, wherein material of the first light guide sub-plate is polymethylmethacrylate (PMMA) and material of the second light guide sub-plate is polycarbonate (PC).