Light source device and display apparatus

Patent metadata

Field	Value
Publication number	US-9632228-B2
Application number	US-201414431539-A
Country	US
Kind code	B2
Filing date	Mar 31, 2014
Priority date	Mar 31, 2014
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Provided are a light source device which may disperse a force shifted in a plane direction due to a difference in thermal expansion by a reflection sheet so as to maintain good display quality, and a display apparatus using the light source device. The light source device includes a transparent plate used as a light guide plate, a light source disposed to face a part of a peripheral surface of the transparent plate along the part thereof, and a reflection sheet attached to one wide surface of the transparent plate, and the reflection sheet is provided with a plurality of cut lines formed in a prescribed range including a center thereof at a prescribed interval. Thereby, even if the transparent plate and the reflection sheet are thermally expanded in relation to the different expansion coefficients from each other, it is possible to prevent the reflection sheet from being peeled off from the transparent plate.

First claim

The invention claimed is:

1. A light source device comprising:
a transparent plate;
a light source disposed to face a part of a peripheral surface of the transparent plate along the part; and
a reflection sheet attached to one wide surface of the transparent plate;
wherein
the reflection sheet includes a plurality of cut lines formed in a predetermined area including a center at a predetermined interval,
the plurality of cut lines are provided so as to make a polygon shape having sides formed by the plurality of cut lines, and
a plurality of polygon shaped parts partitioned by some of the plurality of cut lines in the reflection sheet are provided in a continuous state.

2. The light source device according to claim 1 , wherein
the plurality of cut lines are provided so as to be cut in a honeycomb shape.

3. The light source device according to claim 1 , wherein
the plurality of cut lines are provided so as to be cut in a mesh shape.

4. The light source device according to claim 1 , further comprising a plurality of scattering adhesive bodies including light scattering bodies and being attached to the one wide surface of the transparent plate, wherein
the reflection sheet is attached to the transparent plate by the scattering adhesive bodies.

5. The light source device according to claim 1 , further comprising a scattering adhesive layer including light scattering bodies, attaching the reflection sheet to the transparent plate, and having cut lines at positions corresponding to the cut lines of the reflection sheet.

6. The light source device according to claim 1 , further comprising a scattering adhesive sheet attaching the reflection sheet to the transparent plate, wherein
the scattering adhesive sheet comprises:
a sheet body;
a scattering adhesive layer including light scattering bodies provided on one surface of the sheet body; and
an adhesive layer with no light scattering body provided on the other surface of the sheet body, wherein

the reflection sheet has a plurality of cut lines over an entire surface,
the scattering adhesive sheet has cut lines at positions corresponding to the cut lines of the reflection sheet; and
the cut lines of the scattering adhesive sheet are formed with a depth so as not to reach one surface of the scattering adhesive sheet which is a surface of the scattering adhesive layer side from the other surface of the scattering adhesive sheet which is a surface of the adhesive layer side.

7. The light source device according to claim 5 , wherein
the cut lines of the scattering adhesive layer are provided from the reflection sheet side with a shallower depth than an entire thickness of the scattering adhesive layer.

8. The light source device according to claim 5 , further comprising a reflection layer provided on the one wide surface of the transparent plate, having a plurality of holes, wherein
the reflection sheet is attached to the transparent plate with the reflection layer by the scattering adhesive layer.

9. The light source device according to claim 6 , further comprising a reflection layer provided on the one wide surface of the transparent plate, having a plurality of holes, and
the reflection sheet is attached to the transparent plate with the reflection layer of the transparent plate by the scattering adhesive sheet.

10. A display apparatus comprising:
a liquid crystal panel;
a transparent plate disposed to face the liquid crystal panel;
a light source disposed to face a part of a peripheral surface of the transparent plate along the part; and
a reflection sheet attached to one wide surface on a side opposite to the liquid crystal panel of the transparent plate;
wherein
the reflection sheet includes a plurality of cut lines formed in a predetermined area including a center at a predetermined interval,
the plurality of cut lines are provided so as to make a polygon shape having sides formed by the plurality of cut lines, and
a plurality of polygon shaped parts partitioned by some of the plurality of cut lines in the reflection sheet are provided in a continuous state.

11. The light source device according to claim 8 , wherein the plurality of holes of the reflection layer are circular holes.

12. The light source device according to claim 11 , wherein the holes have a diameter that is larger with increasing distance away from the part of the peripheral surface of the transparent plate along which the light source is disposed.

13. The light source device according to claim 1 , wherein adjacent polygon shaped parts of the plurality of polygon shaped parts are continued via a corner point thereof.

14. The light source device according to claim 10 , wherein adjacent polygon shaped parts of the plurality of polygon shaped parts are continued via a corner point thereof.

Assignees

• Sakai Display Products Corp

Inventors

• Teragawa Daisuke

Classifications

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title

• G02B6/0043

  provided on the surface of the light guide · CPC title

• G02B6/0055 Primary

  Reflecting element, sheet or layer · CPC title

• G02B6/0033 Primary

  Means for improving the coupling-out of light from the light guide · CPC title

• G02B6/0061

  to provide homogeneous light output intensity · CPC title