Display Device with Low Scratch Visibility and Manufacturing Method Thereof

• US 20100066944A1
• Filed: 08/20/2009
• Published: 03/18/2010
• Est. Priority Date: 09/15/2008
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Mei, Kuang-Hua, Chen, Po-Hung, Lin, Shih-Ping
• Granted Patent: US 7,961,270 B2
• Time in Patent Office: Days
• US Class Current: 349/62
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer

Abstract

A display device and a manufacturing method thereof are provided. The display device includes a light guide, a light source, and a brightness enhancement film (BEF), and a dual brightness enhancement film (DBEF). The light guide has a first edge along a first direction and a second edge adjacent to the first edge corresponding to the light source. The BEF is disposed on the light guide and has a plurality of prisms along a second direction which rotates from 0 to 90 degrees with respect to the first direction. The DBEF has a transmission axis along a third direction which also rotates from 0 to 90 degrees with respect to the first direction.

Claims

1. A display device, comprising:

a light guide having a first edge extending along a first direction and a second edge adjacent to the first edge;

a light source, arranged adjacent to the second edge, being capable of emitting light along the first direction into the second edge;

a first brightness enhancement film (BEF), disposed on the light guide, the first BEF having a plurality of prisms along a second direction, the second direction rotating counterclockwise a first angle with respect to the first direction, and the first angle ranging from 0°

to 90°

; and

a dual brightness enhancement film (DBEF), disposed on the first BEF, the DBEF having a transmission axis extending along a third direction, the third direction rotating counterclockwise a second angle with respect to the first direction, and the second angle ranging from 40°

to 50°

; and

a display panel, disposed on the DBEF.

2. The display device of claim 1, wherein the second direction and the third direction include an angle ranging from 0°

and 42°

.

3. The display device of claim 1, wherein the light source includes a tube lamp and the tube lamp extends along the second edge.

4. The display device of claim 1, wherein the light source includes a plurality of light emitting diodes (LEDs) and the LEDs are arranged along the second edge.

5. The display device of claim 1, further comprising a lower polarization film disposed on the DBEF, wherein the lower polarization film has a plurality of protrusions.

6. The display device of claim 5, wherein the protrusions are in contact with a surface of the DBEF.

7. The display device of claim 5, wherein the hardness of the protrusions is higher than the hardness of the surface of the DBEF.

8. The display device of claim 5, further comprising an upper polarization film, disposed on the display panel, wherein the display panel is sandwiched between the upper polarization film and the lower polarization film.

9. The display device of claim 1, further comprising a second BEF disposed between the first BEF and the light guide.

10. The display device of claim 1, further comprising a diffusion film disposed between the first BEF and the light guide.

11. The display device of claim 1, wherein the first angle ranges from 34°

and 67°

.

12. The display device of claim 11, wherein the second angle ranges from 43°

and 47°

.

13. The display device of claim 1, wherein the DBEF further comprises a plurality of optical layers and two surface layers, and the optical layers are sandwiched between the two surface layers.

14. A display device, comprising:

a brightness enhancement film (BEF) having a plurality of prisms; and

a dual brightness enhancement film (DBEF), disposed on the BEF, the DBEF having a transmission axis, a disposing direction of the prisms and the transmission axis having an included angle ranging from 0°

to 42°

;

a lower polarization film, disposed on the DBEF, the lower polarization film having a plurality of protrusions, the protrusions being in contact with a surface of the DBEF, and the hardness of the protrusions being higher than that of the surface of the DBEF; and

a display panel, disposed on the lower polarization film.

15. The display device of claim 14, wherein the included angle ranges from 11°

and 22°

.

16. The display device of claim 14, wherein the DBEF further includes a plurality of optical layers and two surface layers, and the optical layers are sandwiched between the two surface layers.

17. A manufacturing method of a display device, comprising the following steps:

providing a light guide being sequentially divided counterclockwise into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant;

providing a light source adjacent to the third quadrant and the fourth quadrant;

disposing a first brightness enhancement film (BEF) on the light guide, the first BEF having a plurality of prisms extending along the direction passing the second quadrant and the fourth quadrant; and

disposing a dual brightness enhancement film (DBEF) on the first BEF, the DBEF having a transmission axis extending along the direction passing the second quadrant and the fourth quadrant; and

disposing a display panel on the DBEF.

18. The manufacturing method of claim 17, wherein the step of disposing the DBEF includes disposing the prisms in a manner that a disposing direction of the prisms and the transmission axis include an angle ranging from 0°

to 42°

.

19. The manufacturing method of claim 17, further comprising disposing a second BEF between the first BEF and the light guide.

20. The manufacturing method of claim 17, further comprising disposing a lower polarization film between the DBEF and the display panel.