OPTICAL SHEET, AND BACKLIGHT DEVICE AND DISPLAY DEVICE PROVIDED THEREWITH

• US 20090296375A1
• Filed: 05/02/2006
• Published: 12/03/2009
• Est. Priority Date: 06/16/2005
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Iwamoto, Kenichi
• Granted Patent: US 7,905,619 B2
• Time in Patent Office: Days
• US Class Current: 362/97.2
• CPC Class Codes: F21V 17/104 using feather joints, e.g. tongues and grooves, with or without friction
• CPC Class Codes: G02F 1/133322 Mechanical guidance or alignment of LCD panel support components
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members

Abstract

A notch is formed in a side of an optical sheet. As seen in plan view, the notch is shaped such that the maximum width of the notch as measured in the direction parallel to the line connecting both ends of a mouth portion of the notch is greater than the width of the mouth portion along the side of the optical sheet. Here, it is preferable that the notch be polygonal or have a curved shape as seen in plan view.

Claims

1-11. -11. (canceled)

12. An optical sheet having a notch formed in a side thereof,

wherein, as seen in plan view, a maximum width of the notch as measured in a direction substantially parallel to a line connecting both ends of a mouth portion of the notch is greater than a width of the mouth portion.

13. The optical sheet of claim 12, wherein the notch is polygonal as seen in plan view.

14. The optical sheet of claim 12, wherein the notch has an at least partially curved shape as seen in plan view.

15. A backlight device for a display device, the backlight device including:

a light source emitting light;

an optical sheet according to claim 12 arranged to adjust an optical path of the light emitted from the light source to direct the light to a back side of a display panel; and

a frame arranged to attach the optical sheet to the back side of the display panel;

wherein

at least one projection with which the at least one notch in the optical sheet respectively engages is disposed on the frame so that, by making the at least one notch in the optical sheet engage with the at least one projection on the frame, the optical sheet is positioned in place.

16. The backlight device of claim 15, wherein, in a two-dimensional rectangular coordinate system having an origin G (0, 0) thereof at a center of gravity of the optical sheet, having a y-axis thereof running perpendicularly to a side of the optical sheet that is located highest in a direction of gravity in actual use, and having an x-axis thereof running parallel to said side of the optical sheet, a sum of an x-coordinate of a location at which the at the least one projection on the frame respectively engages with the at least one notch in the optical sheet equals zero.

20. A backlight device for a display device, the backlight device including:

a light source emitting light;

an optical sheet according to claim 12 arranged to adjust an optical path of the light emitted from the light source to direct the light to a back side of a display panel; and

a frame arranged to attach the optical sheet to the back side of the display panel;

wherein

an at least one recess with which the at least one protrusion on the optical sheet respectively engages is disposed in the frame such that, by making the at least one protrusion on the optical sheet engage with the at least one recess in the frame, the optical sheet is positioned in place.

21. The backlight device of claim 20, wherein, in a two-dimensional rectangular coordinate system having an origin G (0, 0) thereof at a center of gravity of the optical sheet, having a y-axis thereof running perpendicularly to a side of the optical sheet that is located highest in a direction of gravity in actual use, and having an x-axis thereof running parallel to said side of the optical sheet, a sum of an x-coordinate of a location at which the at least one recess in the frame respectively engages with the at least one protrusion on the optical sheet equals zero.

22. A display device comprising the backlight device of claim 15.

23. A display device comprising the backlight device of claim 16.

24. A display device comprising the backlight device of claim 20.

25. A display device comprising the backlight device of claim 21.

17. An optical sheet having a protrusion formed on a side thereof, wherein, as seen in plan view, a maximum width of the protrusion as measured in a direction substantially parallel to a line connecting both ends of a base of the protrusion along a side of the protrusion is greater than a width of the base.

18. The optical sheet of claim 17, wherein the protrusion is polygonal as seen in plan view.

19. The optical sheet of claim 17, wherein the protrusion has an at least partially curved shape as seen in plan view.