Video display device

• US 10,643,556 B2
• Filed: 08/30/2016
• Issued: 05/05/2020
• Est. Priority Date: 09/01/2015
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Kumamoto, Yasuhiro, Shinya, Takeichi, Higa, Koujirou, Ofuji, Masaaki, Takeuchi, Taizou, Kugimaru, Takahiro
• Primary Examiner(s): Chang, Kent W
• Assistant Examiner(s): Lee, Andrew
• Application Number:
  US15/750,871
• Publication Number:
  US 20180240420A1
• Time in Patent Office: 1,344 Days
• CPC Class Codes: F21S 2/00 Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
• CPC Class Codes: F21V 23/00 Arrangement of electric circuit elements in or on lighting devices characterised by cooling arrangements F21V29/508
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133601 for spatial active dimming
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133612 Electrical details
• CPC Class Codes: G09F 9/00 Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light

Abstract

A video display device includes: a display panel that displays an image based on an image signal; a light source substrate disposed on a rear side of the display panel; a plurality of light emitting elements each of which is attached to a surface of the light source substrate on a side toward the display panel to emit light to the display panel; a reflection sheet; and driver elements that drive each of the plurality of light emitting elements. Partitioning wall portions are formed in the reflection sheet, each of partitioning wall portions separates adjacent ones of the light emitting elements, and expands toward the display panel. The reflection sheet covers the surface of the light source substrate on the side toward the display panel except for portions provided with the light emitting elements. Each of the driver elements is attached to the surface of the light source substrate on the side toward the display panel in a portion surrounded by the corresponding partitioning wall portions.

Claims

1. A video display device comprising:

a display panel that displays an image based on an image signal;

a plurality of light source substrates disposed on a rear side of the display panel;

a plurality of light emitting elements each of which is attached to a surface of one of the plurality of light source substrates on a side toward the display panel to emit light to the display panel;

a one piece reflection sheet in which partitioning wall portions are formed, each of partitioning wall portions separates adjacent ones of the light emitting elements, and protrudes toward the display panel, the one piece reflection sheet covering the surfaces of the plurality of light source substrates on the side toward the display panel except for portions provided with the light emitting elements, the one piece reflection sheet having flat portions disposed on the plurality of light source substrates; and

driver elements each of which is attached to the surface of one of the plurality of light source substrates on the side toward the display panel in a portion surrounded by the corresponding partitioning wall portions to drive each of the plurality of light emitting elements.

2. The video display device according to claim 1, wherein the one piece reflection sheet is made of polypropylene.

3. The video display device according to claim 1, wherein

each of the partitioning wall portions includes two slope portions, a clearance between the two slope portions gradually increases from a top portion of each of the partitioning wall portions toward the plurality of light source substrates, and

an angle of one of the two slope portions to the other of the two slope portions is selected in a range larger than 45 degrees, and 55 degrees or smaller.

4. The video display device according to claim 1, wherein

the plurality of light source substrates are arranged in a first direction, and arranged in a second direction perpendicular to the first direction.

5. The video display device according to claim 1, wherein the partitioning wall portions comprise first partitioning wall portions extending in a first direction and second partitioning wall portions extending in a second direction, where the first direction and the second direction intersect one another.

6. The video display device according to claim 5, wherein the first partitioning wall portions and the second partitioning wall portions are disposed so as to form a grid pattern.

7. The video display device according to claim 1, wherein

the driver elements comprises two types of driver elements, and

the two types of driver elements are disposed between the adjacent ones of the light emitting elements.

8. The video display device according to claim 5, wherein

the driver elements comprises two types of driver elements, and

the two types of driver elements are disposed inside of either one the first partitioning wall portions and the second partitioning wall portions.