System and method for thermally controlling an electronic display with reduced noise emissions
An assembly for cooling an electronic image assembly having a rear channel placed behind the image assembly and a heat exchanger for accepting ambient air. The system contains a first fan placed within the heat exchanger to force ambient air through the heat exchanger and the rear channel. A second fan may be used to force circulating gas through an interior portion of the display housing and through the heat exchanger in order to transfer heat to the ingested ambient air.
1. An assembly for cooling an electronic image assembly within a housing having an inlet aperture for ambient gas, exit aperture for ambient gas, and internal cavity for circulating gas, the assembly comprising:
a first portion of a heat exchanger which accepts ambient gas from the inlet aperture;
a second portion of a heat exchanger which accepts ambient gas from the first portion;
a channel placed behind the electronic image assembly and in gaseous communication with the inlet and exit apertures;
a first fan positioned between the first and second portions which forces ambient gas through the first portion, second portion, and the channel; and
a second fan which forces circulating gas through the internal cavity and at least one of the heat exchanger portions.
2. The cooling assembly of claim 1 wherein:
the first fan also draws ambient gas through the inlet aperture.
3. The cooling assembly of claim 2 wherein:
the first fan also pushes ambient gas through the exit aperture.
4. The cooling assembly of claim 1 further comprising:
an electronic component placed within the path of the circulating gas.
5. The cooling assembly of claim 4 wherein:
the electronic component is a power module.
6. The cooling assembly of claim 1 wherein:
the heat exchanger portions are comprised of corrugated layers.
7. The cooling assembly of claim 1 wherein:
the heat exchanger portions are cross-flow heat exchanger portions.
8. An electronic display assembly comprising:
a housing having an inlet aperture and exit aperture for ambient gas;
an electronic image assembly within the housing;
a transparent front plate in front of the electronic image assembly, the space between the transparent front plate and the electronic image assembly defining a front channel;
a rear plate placed behind the electronic image assembly, the space between the rear plate and the electronic image assembly defining a rear channel;
a heat exchanger in gaseous communication with the front channel, the heat exchanger comprising two portions, each portion having first and second gas pathways, where the first gas pathways are in gaseous communication with the inlet and exit apertures and the second gas pathways are in gaseous communication with the front channel;
an ambient gas fan assembly placed between the two portions of the heat exchanger to force ambient gas through the first gas pathways and through the rear channel; and
a circulating gas fan assembly positioned to force circulating gas through the front channel and the second gas pathways.
9. The electronic display assembly of claim 8 further comprising:
a power module placed within the path of the circulating gas.
10. The electronic display assembly of claim 8 wherein:
the electronic image assembly is a liquid crystal display.
11. The electronic display assembly of claim 8 wherein:
the electronic image assembly is an OLED display.
12. The electronic display assembly of claim 8 wherein:
the heat exchanger is a cross-flow heat exchanger comprised of corrugated layers.
13. The electronic display assembly of claim 8 further comprising:
a plurality of ribs placed within the channel and in thermal communication with the electronic image assembly.
14. The electronic display assembly of claim 13 wherein:
the ribs are metallic.
15. The electronic display assembly of claim 13 wherein:
the ribs are placed in conductive thermal communication with the electronic image assembly.
16. The electronic display assembly of claim 13 wherein:
the ribs have a rectangular cross-section.
17. A thermally-controlled liquid crystal display (LCD) assembly comprising:
a housing having an inlet aperture and exit aperture for ambient gas;
a LED backlight having a rear surface and placed within the housing;
a liquid crystal display (LCD) having a front surface and placed in front of the LED backlight and within the housing;
a transparent front plate in front of the LCD, the space between the transparent front plate and the LCD defining a front channel;
a rear plate placed behind the rear surface of the LED backlight;
a plurality of ribs placed between the rear plate and LED backlight, the space between the rear plate, LED backlight, and ribs defining a plurality of rear channels;
a heat exchanger having a first gas pathway in gaseous communication with the front channel, and a second gas pathway in gaseous communication with the inlet and exit apertures;
an ambient gas fan assembly placed within the heat exchanger to force ambient gas into the inlet aperture, through the second gas pathway and the rear channels, and out of the exit aperture; and
a circulating gas fan assembly positioned to force circulating gas through the front channel and the first gas pathways.
18. The LCD assembly of claim 17 further comprising:
a power module placed within the path of the circulating gas.
19. The LCD assembly of claim 17 wherein:
the heat exchanger is a cross-flow heat exchanger comprised of corrugated layers.
20. The LCD assembly of claim 17 wherein:
the ribs are metallic.