Light guide plate, back light assembly having the same and display apparatus having the same

• US 20060087867A1
• Filed: 10/25/2005
• Published: 04/27/2006
• Est. Priority Date: 10/25/2004
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Jae-Kwang
• Granted Patent: US 7,753,579 B2
• Time in Patent Office: Days
• US Class Current: 362/619
• CPC Class Codes: G02B 6/0018 Redirecting means on the surface of the light guide
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0055 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects

Abstract

In a light guide plate and a display apparatus having the light guide plate, the light guide plate includes an incident face and a first exiting face. The incident face receives a light provided from an exterior. The first exiting face includes a first area and a second area. A first light-controlling pattern is formed in the second area. The first exiting face guides the incident light to the first area by the first light-controlling pattern and exits the guided light.

Claims

1. A light guide plate comprising:

an incident face receiving an incident light provided from an exterior; and

a first exiting face having a first area and a second area, the first exiting face having a first light-controlling pattern formed in the second area to guide the incident light to the first area, the guided light by the first light-controlling pattern exiting from the first exiting face.

2. The light guide plate of claim 1, further comprising a second exiting face having a third area and a fourth area, the second exiting face having a second light-controlling pattern formed in the fourth area to guide the incident light to the third area, the guided light by the second light-controlling pattern exiting from the second exiting face.

3. The light guide plate of claim 2, wherein the second exiting face comprises a third light-controlling pattern formed on the second exiting face.

4. The light guide plate of claim 1, wherein a distribution density of the first light-controlling pattern becomes greater as the distance from the incident face increases.

5. The light guide plate of claim 1, wherein a size of the first light-controlling pattern becomes smaller as the distance from the incident face increases.

6. The light guide plate of claim 1, wherein the first light-controlling pattern comprises a recess having a groove shape, and the recess is extended in a direction substantially in parallel with a surface of the incident face.

7. The light guide plate of claim 1, wherein the first light-controlling pattern has a substantially dot shape when viewed on a plane.

8. The light guide plate of claim 1, wherein the first light-controlling pattern comprises a plurality of protruded patterns having a different height with respect to a surface of the first exiting face.

9. The light guide plate of claim 1, wherein the first light-controlling pattern comprises a plurality of recessed patterns having a different depth with respect to the first exiting face.

10. The light guide plate of claim 1, wherein the first light-controlling pattern has a plurality of arched patterns arranged in succession when viewed on a plane.

11. The light guide plate of claim 1, wherein the second light-controlling pattern has a substantially zigzag shape when viewed on a plane.

12. The light guide plate of claim 2, wherein a distribution density of the second light-controlling pattern becomes greater as a distance from the incident face increases.

13. The light guide plate of claim 2, wherein a size of the second light-controlling pattern becomes smaller as a distance from the incident face increases.

14. The light guide plate of claim 2, wherein the second light-controlling pattern comprises a recess having a groove shape, and the recess is extended in a direction substantially in parallel with the incident face.

15. The light guide plate of claim 2, wherein the second light-controlling pattern has a substantially dot shape.

16. The light guide plate of claim 2, wherein the second light-controlling pattern comprises a plurality of protruded patterns having a different height with respect to the second exiting face.

17. The light guide plate of claim 2, wherein the second light-controlling pattern comprises a plurality of recessed patterns having a different depth with respect to the second exiting face.

18. The light guide plate of claim 2, wherein the second light-controlling pattern has a plurality of arches arranged in succession when viewed on a plane.

19. The light guide plate of claim 2, wherein the second light-controlling pattern has a substantially zigzag shape when viewed on a plane.

20. A back light assembly comprising:

a light source to generate a light; and

a light guide plate comprising;

an incident face receiving a light provided from an exterior; and

a first exiting face having a first area and a second area, the first exiting face having a first light-controlling pattern formed in the second area to guide the light to the first area, and the guided light by the first light-controlling pattern exiting from the first exiting face.

21. The back light assembly of claim 20, wherein the light source comprises a plurality of point light sources.

22. The back light assembly of claim 20, further comprising a first optical member to enhance brightness uniformity of a first light exiting from the first exiting face.

23. The back light assembly of claim 20, wherein the light guide plate further comprises a second exiting face having a third area and a fourth area, the second exiting face comprises a second light-controlling pattern formed in the fourth area to guide the light to the third area and the guided light by the second light-controlling pattern exits from the light guide plate.

24. The back light assembly of claim 23, further comprising a second optical member to enhance uniformity of brightness of a second light exiting from the second exiting face.

25. The back light assembly of claim 23, further comprising a transflective member to reflect a portion of the second light from the second exiting face and transmit a remaining portion of the second light through the transflective member.

26. The back light assembly of claim 20, wherein the first light-controlling pattern has a plurality of arched patterns arranged in succession when viewed on a plane.

27. The back light assembly of claim 26, wherein a center portion of the arched patterns corresponds to a center portion of the light source.

28. The back light assembly of claim 20, wherein the first light-controlling pattern has a substantially zigzag shape when viewed on a plane.

29. The back light assembly of claim 28, wherein each of vertexes of the zigzag shape corresponds to a center portion of the light source.

30. A display apparatus comprising:

a first display panel including a first display area to display an image and a first light blocking area to block light; and

a back light assembly to apply the light to the first display panel, the backlight assembly having a light guide plate on which a first light-controlling pattern is formed on an exiting face of the light guide plate corresponding to the first light blocking area.

31. The display apparatus of claim 30, further comprising a second display panel having a second display area to display the image and a second light blocking area to block the light.

32. The display apparatus of claim 31, wherein the light guide plate further comprises a second exiting face on which a second light-controlling pattern is formed, and the second light-controlling pattern corresponds to the second light blocking area.

33. The display apparatus of claim 32, further comprising a transflective member to reflect a portion of the second light from the second exiting face and transmit a remaining portion of the second light.

34. The display apparatus of claim 33, further comprising a reflecting member disposed between the transflective member and the second display panel, the reflecting member partially reflecting a light transmitted through the transflective member to the light guide plate, the reflecting member having an opening that has a substantially same size as the second display panel.