Thermal management for a thin environmentally-sealed LCD display enclosure

• US 6,493,440 B2
• Filed: 04/23/2001
• Issued: 12/10/2002
• Est. Priority Date: 04/23/2001
• Status: Expired due to Fees

• Current Assignee: Gilbarco Incorporated (Vontier Corp.)
• Original Assignee: Gilbarco Incorporated (Vontier Corp.)
• Inventors: Long, Joseph D., Gromatzky, Jonathan A.
• Primary Examiner(s): DUDEK, JAMES A
• Application Number:
  US09/840,338
• Publication Number:
  US 20020154255A1
• Time in Patent Office: 596 Days
• Field of Search: 349/161
• US Class Current: 379/161
• 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 1/133526 Lenses, e.g. microlenses or Fresnel lenses
• CPC Class Codes: G02F 2201/36 Airflow channels, e.g. constructional arrangements facilitating the flow of air
• CPC Class Codes: H05K 7/20972 Forced ventilation, e.g. on heat dissipaters coupled to components

Abstract

The present invention relates to a thermal management system for a thin depth LCD display enclosure. The LCD display enclosure may be used in environmentally sensitive conditions and may be environmentally-sealed to protect the components of the LCD display from environmental conditions. The LCD display components may include a lens and a LCD module, and other heating producing components, such as backlights and electronic circuitry. The heat producing components and any external heat placed on the enclosure causes the ambient air temperature inside the enclosure to rise thereby possibly causing the LCD display to not operate properly. The ambient air temperature inside the enclosure is lowered by transferring heat in the ambient air through the enclosure to a heat sink that is attached on the outside rear portion of the enclosure, and to the atmosphere using forced convection, natural convention, or both.

Claims

1. A LCD display, comprising:

an environmentally-sealed enclosure having a front portion and a rear portion;

a lens placed on said front portion for viewing of the LCD display;

a backlight assembly attached to said rear portion and having at least one backlight;

a heat sink connected to the outside of said rear portion to convectively transfer heat through said enclosure to the atmosphere;

a LCD module located in between said lens and said backlight assembly and in between the top and bottom of said enclosure to form air gaps at the top and bottom of the inside of said enclosure to form a circular airflow path for the ambient air inside said enclosure; and

a fan placed in said airflow path to circulate the ambient air inside said enclosure to said rear portion to transfer heat in the ambient air through said enclosure to said heat sink and to the atmosphere using forced convection.

2. The LCD display of claim 1, wherein said heat sink transfers heat generated by said at least one backlight through said enclosure to said heat sink and to the atmosphere using natural convection.

3. The LCD display of claim 1, wherein said fan is an axial fan.

4. The LCD display of claim 1, wherein said fan produces a laminar airflow across said LCD module.

5. The LCD display of claim 1, wherein said fan rotates at a speed of around about 3400 rpm.

6. The LCD display of claim 1, wherein said fan is placed in said airflow path at an end of said enclosure.

7. The LCD display of claim 1, wherein said fan is placed in said airflow path in between the ends of said enclosure.

8. The LCD display of claim 1, wherein said enclosure is less than or equal to a depth of around about 40 millimeters.

9. The LCD display of claim 1, wherein said LCD module is spaced at a distance of around about 9.4 millimeters from said lens.

10. The LCD display of claim 1, wherein said enclosure is constructed out of materials comprised from the group consisting of sheet metal, aluminum, and copper.

11. The LCD display of claim 1, wherein said backlight assembly is physically connected to said rear portion of said enclosure.

12. The LCD display of claim 1, wherein said backlight assembly comprises a backlight reflector that is attached to said rear portion to place said at least one backlight bulb in close proximity to said rear portion.

13. The LCD display of claim 1, further comprising a control system that controls information displayed on said LCD module.

14. The LCD display of claim 13, wherein said control system is comprised of electronics having a microprocessor and software.

15. The LCD display of claim 1, wherein said LCD module is adapted to display an Internet browser.

16. The LCD display of claim 1, wherein said enclosure is less than or equal to a depth of around about 40 millimeters.

18. The energy dispenser of claim 1, wherein said heat sink transfers heat generated by said at least one backlight through said enclosure to said heat sink and to the atmosphere using natural convection.

17. An energy dispenser that dispenses energy into a customer'"'"'s vehicle, comprising:

a housing;

an energy-dispensing outlet;

a control system in said housing that controls the dispensing of the energy through said energy dispensing outlet; and

a LCD display under control of said control system that displays information to the customer, said LCD display comprising;

an environmentally-sealed enclosure having a front portion and a rear portion;

a lens placed on said front portion for external viewing of the LCD display;

a backlight assembly attached to said rear portion and having at least one backlight;

a heat sink connected to the outside of said rear portion to convectively transfer heat through said enclosure to the atmosphere;

a LCD module located in between said lens and said backlight assembly and in between the top and bottom of said enclosure to form air gaps at the top and bottom of the inside of said enclosure to form a circular airflow path for the ambient air inside said enclosure; and

a fan placed in said airflow path to circulate the ambient air inside said enclosure to said rear portion to transfer heat in the ambient air through said enclosure to said heat sink and to the atmosphere using forced convection.

19. The energy dispenser of claim 17, wherein said information is comprised from the group consisting of text and graphical information.

20. The energy dispenser of claim 17, wherein said information is comprised from the group consisting of weather, stock quotes, discounts, advertising, coupons, purchasing information, and special purchases.

21. The LCD display of claim 17, wherein said fan is an axial fan.

22. The LCD display of claim 17, wherein said fan produces a laminar airflow across said LCD module.

23. The LCD display of claim 17, wherein said fan rotates at a speed of around about 3400 rpm.

24. The LCD display of claim 17, wherein said fan is placed in said airflow path at an end of said enclosure.

25. The LCD display of claim 17, wherein said fan is placed in said airflow path in between the ends of said enclosure.

26. The LCD display of claim 17, wherein said enclosure is less than or equal to a depth of around about 40 millimeters.

27. The LCD display of claim 17, wherein said LCD module is spaced at a distance of around about 9.4 millimeters from said lens.

28. The LCD display of claim 17, wherein said enclosure is constructed out of materials comprised from the group consisting of sheet metal, aluminum, and copper.

29. The LCD display of claim 17, wherein said backlight assembly is physically connected to said rear portion of said enclosure.

30. The LCD display of claim 17, wherein said backlight assembly comprises a backlight reflector that is attached to said rear portion to place said at least one backlight bulb in close proximity to said rear portion.

31. The LCD display of claim 17, further comprising a control system that controls information displayed on said LCD module.

32. The LCD display of claim 31, wherein said control system is comprised of electronics having a microprocessor and software.

33. The LCD display of claim 17, wherein said LCD module is adapted to display an Internet browser.

34. The LCD display of claim 17, wherein said energy dispenser is a fuel dispenser.

35. A method of manufacturing a cooled LCD display in an environmentally-sealed disclosure, comprising the steps of:

placing a lens on a front portion of the enclosure;

attaching a backlight assembly to a rear portion of the enclosure;

placing at least one backlight in said backlight assembly;

attaching a heat sink to the outside of said rear portion to convectively transfer heat through said enclosure to the atmosphere;

placing a LCD module in the enclosure in between said lens and said backlight assembly and leaving gaps at the top and bottom of the inside of the enclosure to form a circular air flow path around said LCD module; and

placing a fan in said airflow path to circulate the ambient air inside said enclosure to said rear portion to transfer heat in the ambient air through said enclosure to said heat sink and to the atmosphere using forced convection.

36. The method of claim 35, further comprising transferring heat generated by said at least one backlight through said enclosure to said heat sink and to the atmosphere using natural convection.

37. The method of claim 35, further comprising mounting said enclosure in an energy dispenser.

38. The method of claim 37, further comprising attaching a control system to said LCD module for controlling information displayed on said LCD module.

39. Further comprising transferring heat generated by at least one backlight to the enclosure through said heat sink and to the atmosphere using natural convection;

and

a method of lowering the temperature of ambient air inside an environmentally-sealed enclosure for a LCD display, comprising the steps of;

heating the ambient air inside the enclosure by operation of the LCD display;

moving the ambient air inside in the enclosure to a rear portion of the enclosure; and

convectively transferring the heat in the ambient air to the atmosphere by transferring the heat through a heat sink attached to said rear portion of the enclosure using forced convection.