Display device allowing repeated removal and installation of screw

• US 8,174,838 B2
• Filed: 04/24/2009
• Issued: 05/08/2012
• Est. Priority Date: 04/25/2008
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: Kanda, Atsushi, Takahashi, Tsuzuki
• Primary Examiner(s): Edmonds, Lisa Lea
• Assistant Examiner(s): Cunningham, Xanthia C
• Application Number:
  US12/429,777
• Publication Number:
  US 20090268416A1
• Time in Patent Office: 1,110 Days
• Field of Search: 361/752, 361/818
• US Class Current: 361/752
• CPC Class Codes: H05K 7/142 Spacers not being card guides

Abstract

A display device includes a circuit board having a plurality of pixels arranged thereon, each pixel having a plurality of light emitting elements, a driving circuit driving the light emitting elements, a case housing the above, a frame having flanges at a circuit board side of the case to block external light toward the light emitting elements, and a shield disposed between the frame and the case to block electromagnetic noise. A screw is inserted into a through hole and placed into a screw receiving portion to fix the frame and the case. The screw receiving portion has a cylindrical metal portion housing the screw and electrically connecting the screw and the shield, and a resin portion interposed between the placed screw and the inner wall surface of the cylindrical metal portion.

Claims

1. A display device comprising:

a circuit board having a pixel formed by a plurality of light emitting elements arranged thereon;

a driving circuit for driving the light emitting elements,

a case to which the circuit board and the driving circuit are to be arranged,

a frame disposed at a circuit board side of the case and having a flange to block external light from entering the light emitting elements, the frame being defining a through hole through which a screw can be inserted;

a shield disposed between the frame and the case to block electromagnetic noise; and

a screw inserted through the through hole defined in the frame,

wherein a screw receiving portion is provided in the case, the screw inserted through the through hole in the frame is placed into the screw receiving portion provided in the case to fix the frame with the case, and

wherein the screw receiving portion has a cylindrical metal portion to house the screw and to electrically connect the screw to the shield and a resin portion interposed between the placed screw and an inner wall of the cylindrical metal portion,

wherein the metal portion has a cut-out portion connecting from the inner wall surface of the metal portion to the side surface, and the resin portion and the case are connected by a resin which is a component of the resin portion and the case through the cut-out portion.

2. The display device according to claim 1, wherein a side surface of the metal portion has a projection and the projection and the resin portion forming the case are fit with each other in a projection-recess engagement form.

3. The display device according to claim 1, wherein a top of the metal portion protrudes further than a top of the resin portion of the screw receiving portion or the resin portion forming the case.

4. The display device according to claim 1, wherein the metal portion is electrically connected to a ground electrode disposed on a housing which is to fix the display device.

5. The display device according to claim 1, wherein the screw is a tapping screw.

6. A case for a display device comprising:

a circuit board having a pixel made of a plurality of light emitting elements arranged thereon;

a driving circuit to drive the light emitting elements;

a shield to block electromagnetic noise; and

a screw receiving portion capable of inserting a screw therein and formed in the case,

wherein a frame defining a through hole is disposed at the circuit board side of the case, a screw is inserted through the through hole and placed to the screw receiving portion so as to enable fixing of the frame and the case, and

wherein the screw receiving portion comprises a cylindrical metal portion housing the screw and electrically connected to the shield and a resin portion interposed between the placed screw and an inner surface of the cylindrical metal portion,

wherein the metal portion has a cut-out portion connecting from the inner wall surface of the metal portion to the side surface, and the resin portion and the case are connected by a resin which is a component of the resin portion and the case through the cut-out portion.

7. The case for a display device according to claim 6, wherein a side surface of the metal portion has a projection and the projection and the resin portion forming the case are fit with each other in a projection-recess engagement form.

8. The case for a display device according to claim 6, wherein a top of the metal portion protrudes further than a top of the resin portion of the screw receiving portion or the resin portion forming the case.

9. The case for a display device according to claim 6, wherein the metal portion is electrically connected to a ground electrode disposed on a housing which is to fix the display device.

10. The case for a display device according to claim 6, wherein the screw is a tapping screw.

11. A display device comprising:

a circuit board having a pixel formed by a plurality of light emitting elements arranged thereon;

a driving circuit for driving the light emitting elements,

a case to which the circuit board and the driving circuit are to be arranged,

a frame disposed at a circuit board side of the case and having a flange to block external light from entering the light emitting elements, the frame defining a through hole through which a screw can be inserted;

a shield disposed between the frame and the case to block electromagnetic noise; and

a screw inserted through the through hole defined in the frame,

wherein a screw receiving portion is provided in the case, the screw inserted through the through hole in the frame is placed into the screw receiving portion provided in the case to fix the frame with the case, and

wherein the screw receiving portion has a cylindrical metal portion to house the screw and to electrically connect the screw to the shield and a resin portion interposed between the placed screw and an inner wall of the cylindrical metal portion, and

wherein the metal portion is electrically connected to a ground electrode disposed on a housing which is to fix the display device.

12. The display device according to claim 11, wherein a side surface of the metal portion has a projection and the projection and the resin portion forming the case are fit with each other in a projection-recess engagement form.

13. The display device according to claim 11, wherein a top of the metal portion protrudes further than a top of the resin portion of the screw receiving portion or the resin portion forming the case.

14. The display device according to claim 11, wherein the screw is a tapping screw.

15. A case for a display device comprising:

a circuit board having a pixel made of a plurality of light emitting elements arranged thereon;

a driving circuit to drive the light emitting elements;

a shield to block electromagnetic noise; and

a screw receiving portion capable of inserting a screw therein and formed in the case,

wherein a frame defining a through hole is disposed at the circuit board side of the case, a screw is inserted through the through hole and placed to the screw receiving portion so as to enable fixing of the frame and the case, and

wherein the screw receiving portion comprises a cylindrical metal portion housing the screw and electrically connected to the shield and a resin portion interposed between the placed screw and an inner surface of the cylindrical metal portion, and

wherein the metal portion is electrically connected to a ground electrode disposed on a housing which is to fix the display device.

16. The case for a display device according to claim 15, wherein a side surface of the metal portion has a projection and the projection and the resin portion forming the case are fit with each other in a projection-recess engagement form.

17. The case for a display device according to claim 15, wherein a top of the metal portion protrudes further than a top of the resin portion of the screw receiving portion or the resin portion forming the case.

18. The case for a display device according to claim 15, wherein the screw is a tapping screw.