Constricted convection cooling for an electronic display

• US 10,506,738 B2
• Filed: 12/21/2017
• Issued: 12/10/2019
• Est. Priority Date: 03/03/2008
• Status: Active Grant

• Current Assignee: Manufacturing Resources International, Inc.
• Original Assignee: Manufacturing Resources International, Inc.
• Inventors: Dunn, William
• Primary Examiner(s): Blevins, Jerry M
• Application Number:
  US15/850,158
• Publication Number:
  US 20180116073A1
• Time in Patent Office: 719 Days
• Field of Search: 349161
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133385 with cooling means, e.g. fans
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: H05K 7/20145 Means for directing air flow, e.g. ducts, deflectors, plenum or guides
• CPC Class Codes: H05K 7/20154 Heat dissipaters coupled to components
• CPC Class Codes: H05K 7/202 Air circulating in closed loop within enclosure wherein heat is removed through heat-exchangers
• CPC Class Codes: H05K 7/20972 Forced ventilation, e.g. on heat dissipaters coupled to components

Abstract

A system for cooling an electronic display is provided. The electronic display has a posterior surface and is located in a housing. A constricted convection plate is located behind, and covers a majority of, the posterior surface. A channel is formed between the constricted convection plate and the posterior surface. A fan draws ambient air through the channel.

Claims

1. A cooling system comprising:

an electronic display comprising a backlight having a posterior surface;

a housing for the electronic display;

a constricted convection plate placed within the housing, spaced apart from the electronic display, and posterior to the posterior surface of the backlight, wherein the constricted convection plate covers at least the majority of the posterior surface;

a channel formed between the constricted convection plate and the posterior surface; and

a plurality of fans positioned along the channel to draw in ambient air and generate a substantially uniform flow of the ingested ambient air through the channel.

2. The cooling system from claim 1 further comprising:

at least one electronic component for operating the electronic display located on the constricted convection plate such that the electronic component is located outside of the channel.

3. The cooling system from claim 1 wherein:

the electronic display is a liquid crystal display.

4. The cooling system from claim 1 wherein:

the constricted convection plate is substantially parallel to the posterior display surface.

5. The cooling system from claim 4 wherein:

the constricted convection plate has substantially the same surface area as the posterior display surface.

6. The cooling system from claim 1 further comprising:

at least one bracket which connects the posterior display surface with the constricted convection plate.

7. The cooling system from claim 1 further comprising:

a heat sink placed within the channel.

8. The cooling system from claim 1 further comprising:

a first side panel and a second side panel, wherein the first and second side panels are spaced apart from one another and extend between the posterior display surface and the constricted convection plate to further define the channel.

9. A cooling system for a liquid crystal display (LCD) comprising:

a liquid crystal stack;

a backlight assembly located behind the liquid crystal stack and comprising;

a printed circuit board (PCB) having front and back sides,

a plurality of LEDs mounted on the front side of the PCB, and

a posterior surface on the rear side of the PCB;

a constricted convection plate positioned behind, spaced apart from, and substantially parallel to the posterior surface of the PCB;

a channel defined by the spaced between the constricted convection plate and the posterior surface of the PCB; and

a number of fans positioned along the channel to draw in air and generate a substantially uniform flow of the ingested air across the channel to facilitate substantially uniform cooling of the backlight assembly.

10. The LCD from claim 9 further comprising:

at least one bracket which connects the posterior surface with the constricted convection plate.

11. The LCD from claim 9 further comprising:

a housing for the liquid crystal stack, backlight assembly, constricted convection plate, and fan; and

an entrance aperture within the housing which permits ambient air to enter the housing and flow between the constricted convection plate and the posterior surface of the PCB.

12. The LCD from claim 9 wherein:

the constricted convection plate covers a majority of the posterior surface of the PCB.

13. The LCD from claim 9 further comprising:

a first and second side panel, wherein said side panels extend from either side of the posterior surface of the PCB to the respective side of the constricted convection plate, wherein the side panels are positioned substantially parallel with one another and further define the channel.

14. An electronic display assembly comprising:

an electronic display comprising a front surface and a posterior surface;

a constricted convection plate behind, spaced apart from, and substantially parallel with the posterior surface of the display, wherein the constricted convection plate covers a majority of the posterior surface;

a housing containing the electronic display and the constricted convection plate;

a fan positioned to force ambient air through a channel defined by the constricted convection plate and the posterior surface; and

at least one electronic component located on the constricted convection plate such that the electronic component is positioned outside of the channel;

wherein the constricted convection plate provides a thermal barrier between the at least one electronic device and the electronic display.

15. The electronic display assembly from claim 14 wherein:

the at least one electronic component is for operating the electronic display.

16. The electronic display assembly from claim 14 further comprising:

at least one bracket connecting the posterior surface with the constricted convection plate.

17. The electronic display assembly from claim 14 further comprising:

a gaseous closed loop traveling across the front display surface, between the constricted convection plate and the housing, and returning to the front display surface; and

a fan positioned to propel gas around the closed loop.

18. The electronic display assembly from claim 14 wherein:

the electronic display comprises a liquid crystal display having a backlight assembly; and

the posterior surface is the rear surface of the backlight assembly.

19. The electronic display assembly from claim 14 further comprising:

a pair of sidewalls extending between the posterior surface and the constricted convection plate on opposite side thereof and substantially parallel to one another so as to further define the channel.