Constricted convection cooling system for an electronic display

• US 9,894,800 B2
• Filed: 10/26/2015
• Issued: 02/13/2018
• 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:
  US14/923,188
• Publication Number:
  US 20160044829A1
• Time in Patent Office: 841 Days
• Field of Search: 349161, 349 69, 349165, 349169, 34910434
• 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

Preferred embodiments provide a cooling system for an electronic display. A constricted convection plate is used to force cooling air against a posterior surface of the electronic display. Fans may be used to propel or pull air between the constricted convection plate and the rear surface of an electronic display. A refrigeration unit or thermoelectric module may be employed to cool or heat the air traveling through the constricted convection channel. Some embodiments include a closed loop which extracts heat (or adds heat) to the front display surface.

Claims

1. A system for cooling an electronic display having a posterior display surface and contained within a housing, the system comprising:

a constricted convection plate placed posterior to the posterior display surface and covering the majority of the posterior display surface;

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

a fan placed to draw ambient air through the channel;

wherein the constricted convection plate thermally isolates electrical components for operating the electronic display from the posterior display surface.

2. The cooling system from claim 1 wherein:

the posterior display surface comprises the rear surface of a backlight assembly.

3. The cooling system from claim 1 wherein:

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

4. The cooling system from claim 1 further comprising:

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

5. The cooling system from claim 1 further comprising:

a heat sink placed within the channel.

6. A liquid crystal display (LCD) comprising:

a liquid crystal stack;

a backlight assembly 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;

a posterior surface on the rear side of the PCB which does not have any electronic devices attached directly thereto;

a constricted convection plate placed behind the posterior surface of the PCB; and

a fan positioned to draw air between the constricted convection plate and the posterior surface.

7. The LCD from claim 6 further comprising:

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

8. The LCD from claim 6 further comprising:

a heat sink placed between the constricted convection plate and the posterior surface of the backlight assembly.

9. The LCD from claim 6 further comprising:

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

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

10. The LCD from claim 6 further comprising:

a plurality of access apertures on the constricted convection plate.

11. An electronic display assembly comprising:

an electronic display comprising a front display surface and a posterior surface where no electronics are mounted directly to the posterior surface of the electronic display;

a constricted convection plate behind the posterior surface of the display; and

a fan positioned to force ambient air between the constricted convection plate and the posterior surface of the electronic display;

wherein the constricted convection plate isolates the posterior surface from electronic devices for operating said electronic display.

12. The electronic display assembly from claim 11 further comprising:

a plurality of apertures on the constricted convection plate.

13. The electronic display assembly from claim 11 further comprising:

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

14. The electronic display assembly from claim 11 further comprising:

a housing which contains the electronic display, constricted convection plate, and means for forcing air; and

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

15. The electronic display assembly from claim 11 further comprising:

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

a means for propelling gas around the closed loop; and

a means for cooling the gas in the closed loop.

16. The electronic display assembly from claim 15 wherein:

the means for propelling the gas around the closed loop comprises a plurality of fans within the closed loop.

17. The electronic display assembly from claim 14 wherein:

the fan is placed near the entrance aperture.

18. The electronic display assembly from claim 11 wherein:

the electronic display comprises an LED backlight LCD display where the posterior surface is the rear surface of a backlight assembly.