Cooling system for double sided display assembly

Abstract

A pair of electronic displays are placed back to back and are configured for mounting to a vehicle. A pair of thermal plates are located behind the electronic displays and a pair of transparent plates are located in front of the electronic displays. A closed loop of air travels vertically through the space between the electronic displays and transparent panels and through a closed loop plenum. An open loop of air travels horizontally through the space between thermal plates and the rear surface of the electronic displays.

Description

TECHNICAL FIELD

Embodiments of the present invention generally relate to cooling systems for electronic displays.

BACKGROUND

Electronic displays are sometimes used in outdoor environments or other areas where the surrounding temperatures may be high or there may be other sources of heat such as solar loading causing the temperatures within the display to rise. However, some portions of the display can be difficult to cool as simply ingesting ambient air into some portions of the display can introduce dust and contaminates into sensitive portions of the display, which can lead to premature failures.

SUMMARY OF THE INVENTIVE CONCEPT

Exemplary embodiments may comprise multiple separate flow paths for a fluid, such as air, through an electronic display housing. At least one path may be a closed loop and several other paths may provide open loops. The closed loop path preferably circulates through a sealed electronics compartment as well as pass between the electronic display(s) and a front transparent panel. A first open loop of ambient air may pass behind the first electronic display while a second path of ambient air may pass behind the second electronic display. In some embodiments the open loop air also removes heat from a thermal plate having electronic components and in some embodiments the open loop air also removes heat from an LED backlight (or LED display). The fans can be positioned so as to precisely control the amount of fluid travelling through each path.

BRIEF DESCRIPTION OF THE DRAWINGS

In addition to the features mentioned above, other aspects of the present invention will be readily apparent from the following descriptions of the drawings and exemplary embodiments, wherein like reference numerals across the several views refer to identical or equivalent features, and wherein:

FIG. 1 is a front perspective view showing an exemplary embodiment of the double sided display assembly, as well as the location for section lines A-A, B-B, and C-C.

FIG. 2 is a side section view of the embodiment shown in FIG. 1, taken along the section line A-A.

FIG. 3 is a front section view of the embodiment shown in FIG. 1, taken along the section line B-B.

FIG. 4 is a top section view of the embodiment shown in FIG. 1, taken along the section line C-C and indicating the location for Detail A.

FIG. 5 is a detailed section view of Detail A.

FIG. 6 is a partial exploded view of the embodiment shown in FIG. 1.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENT(S)

The invention is described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/ or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Embodiments of the invention are described herein with reference to illustrations that are schematic illustrations of idealized embodiments (and intermediate structures) of the invention. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments of the invention should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

FIG. 1 is a front perspective view showing an exemplary embodiment of the double sided display assembly, as well as the location for section lines A-A, B-B, and C-C. Generally speaking, an exemplary embodiment includes two displays 30 and 31 positioned back to back and placed within a housing 25. An inlet aperture 50 accepts a flow of ambient air 60 into and through the housing 25. The ambient air 60 is preferably exhausted out of the housing 25 through the exhaust aperture 55. A closed loop flow of circulating gas 70 travels within the housing 25 as well, but preferably does not mix with the flow of ambient air 60 in any substantial manner.

As used herein, the term ambient air 60 simply refers to common atmospheric air that would provide the surrounding environment for the assembly. This ambient air 60 is known to contain a mixture of different types of gaseous elements, as well as dust, dirt, pollen, water vapor, and other particulate. Also as used herein, the term circulating gas 70 can refer to any gaseous matter, which might be a mixture of different types of gases or could be a pure gaseous matter. Preferably, the circulating gas 70 does not contain substantial amounts of dust, dirt, pollen, or other types of particulate.

Exemplary embodiments of the present invention may be configured for mounting to a vehicle, preferably to the roof. The housing 25 may be sized and configured for fitting atop a vehicle roof. Further, the housing 25 may be sized and adapted to minimize aerodynamic drag. The housing 25 may comprise a pair of feet 26 for mounting the housing 25 to the vehicle. The feet 26 may be sized and configured to be secured to a vehicle's roof, or to be secured to internal supports placed on or within the vehicle. In such embodiments, the housing 25 is preferably thin and comprises rounded corners and other features to minimize aerodynamic drag. The housing 25 may comprise a variety of stiffening members to provide structural rigidity and strength to accommodate the forces caused by a moving vehicle. Likewise, the various components of the display assembly may be configured or comprised of a sufficiently rigid material so as to accommodate the forces caused by a moving vehicle. Furthermore, the housing and various components of the display assembly may be configured to withstand the forces, vibrations, and other rigors of being mounted to a vehicle. For example, but not to serve as a limitation, the feet 26 and other components of the display assembly may comprise rubber pads or other vibration and shock absorption devices.

As indicated in the figure, section line A-A is positioned horizontally down the center of the assembly and cuts through the assembly vertically. Section line B-B is oriented vertically and cuts through the assembly horizontally. Finally, section line C-C is oriented horizontally and cuts through the assembly horizontally as well. The section line arrows in FIG. 1 indicate the direction of hypothetical cut to obtain the section view.

FIG. 2 is a side section view of the embodiment shown in FIG. 1, taken along the section line A-A. The ambient air 60 may enter the housing 25 through the inlet aperture 50, where it may then be directed into an entrance plenum, and pass through one of a plurality of entrance apertures 200 which connect with the open loop channels (described further below). The ambient air 60 is preferably pulled by one or more fans 100, but the fans 100 could also be positioned to push the ambient air 60, or several fans could be used for a combination of push/pull. In this particular embodiment, the fan 100 is located near an exit plenum, where the ambient air 60 is collected from the open loop channels by travelling through one of a plurality of exit aperture 201, collected within the exit plenum, and directed out of the housing 25 through the exhaust aperture 55.

As will be described further below, the entrance apertures 200 and exit apertures 201 are in gaseous communication with a first open loop channel running behind the electronic display 31. There is preferably another set of entrance apertures and exit apertures on the opposite side of the assembly (not shown in this view), which communicate with a second open loop channel running behind the electronic display 30. The apertures 200 and 201 are preferably distributed across the width of the electronic display 30/31 in a substantially equidistant manner from one another. The apertures 200/201 allow the flow of ambient air 60 to pass through the housing 25 and the open loop channels without substantially mixing with the circulating gas 70 or entering the sealed electronics compartment 125.

A plurality of electronic components 110 are preferably placed within a sealed electronics compartment 125 which forms a part of the closed loop for the circulating gas 70. The electronic components 110 may comprise one or more of the following: power modules, video player, electronic data storage, microprocessor, satellite/wireless receiver/transmitter, and timing and control board. At least some of the electronic components 110 may be in electrical connection with the displays 30 and 31.

One or more fans 90 may force the closed loop of circulating gas 70 over the electronic components 110. While shown with two fans 90, this is not required. Additionally, while shown pushing the circulating gas 70 over the electronic components 110, this is not required as the fans 90 could also be positioned to pull the circulating gas 70, or several fans 90 could be used in a combination push/pull of the circulating gas 70.

FIG. 3 is a front section view of the embodiment shown in FIG. 1, taken along the section line B-B. Here, the closed loop of circulating gas 70 can be clearly shown. As mentioned above, the circulating gas 70 preferably travels over the electronic components 110 within the sealed electronics compartment 125 and then splits to wrap around each of the displays 30 and 31. Regarding the first display 30, a transparent panel 35 is preferably placed in front of the display 30 to define a closed loop channel between the display 30 and the transparent panel 35 for accepting circulating gas 70. Once the circulating gas 70 has travelled across the display 30, it is directed back in to the sealed electronics compartment 125 to begin the closed loop again.

Similarly, regarding the second display 31, a transparent panel 36 is preferably placed in front of the display 31 to define a closed loop channel between the display 31 and the transparent panel 36 for accepting circulating gas 70. Once the circulating gas 70 has travelled across the display 31, it is directed back in to the sealed electronics compartment 125 to begin the closed loop again.

As shown, the flow of ambient air 60 is preferably split into at least two channels, with one open loop channel travelling behind each display. Regarding display 30, a path of ambient air 60 preferably travels between the rear surface of the display 30 and a thermal wall 126 of the sealed electronics compartment 125. Although not required, when using a direct LED backlit LCD as the display 30, the ambient air 60 preferably travels between the rear surface of the LED backlight 40 and the thermal wall 126. As shown above, a plurality of electronic components 110 are preferably attached to (or near) one or both thermal walls 126 and 127. In this way, heat from the electronic components 110 may be transferred (preferably through conduction but some convection and radiation may occur as well) to the walls 126 and 127 and removed by the flow of ambient air 60.

Similarly regarding display 31, a path of ambient air 60 preferably travels between the rear surface of the display 31 and a thermal wall 127 of the sealed electronics compartment 125. Although not required, when using a direct LED backlit LCD as the display 31, the ambient air 60 preferably travels between the rear surface of the LED backlight 41 and the thermal wall 127. It should be expressly noted that although a direct LED backlit LCD is shown in these embodiments, this type of display and its associated backlight is not necessary for every embodiment. The displays 30 and 31 could be any one of the following: plasma, OLED, LCD (direct lit or edge lit), LED, and any type of electroluminescent polymer display.

FIG. 4 is a top section view of the embodiment shown in FIG. 1, taken along the section line C-C and indicating the location for Detail A. In this figure, the two channels for ambient air 60 behind each of the displays 30 and 31 can be seen. Again, preferably the two paths of ambient air 60 can remove heat from the electronic displays 30 and 31 as well as the electronics 110 (through the thermal walls 126 and 127).

FIG. 5 is a detailed section view of Detail A. Once the ambient air 60 has travelled through each of the open loop channels, it can be gathered by the exit plenum and forced out of the display housing 25 by the fan 100.

FIG. 6 is a partial exploded view of the embodiment shown in FIG. 1. This shows the stacking of the elements for one side of the assembly, i.e. the components surrounding electronic display 31. The ambient air 60 is preferably directed through the entrance apertures 200 so that it may pass between the thermal plate 127 and the rear of the electronic display 31 (in this embodiment, the rear surface of the LED backlight 41). Once passing through the open loop channel, the ambient air 60 is preferably directed out of an exit aperture 201 so that it can be collected in the exit plenum and exhausted out of the display housing. The circulating gas 70 generally encircles the open loop channel(s) having the ambient air 60. In other words, the open loop ambient air 60 passes through the center of the closed loop of circulating gas 70.

As noted above, the circulating gas 70 preferably passes over electronic components 110, exits the sealed electronics compartment 125, travels between the front transparent plate 36 and the front of the electronic display 31, eventually returning to the sealed electronics compartment 125. Again it should be noted that only one half of the embodiment is shown in this partial exploded view. Generally, there would be a second closed loop of circulating gas 70 travelling around the opposing display 30 and a second open loop channel for ambient air 60 passing behind the display 30, as shown and described above.

It should also be noted that the variety of open and closed cooling loops that are shown in the figures may be shown in a horizontal or vertical arrangement but it is clearly contemplated that this can be reversed or changed depending on the particular embodiment. Thus, the closed loop may run horizontally or vertically and in a clockwise or counter-clockwise direction. Further, the open loop may also be horizontal or vertical and can run left to right, right to left, and top to bottom, or bottom to top.

Having shown and described a preferred embodiment of the invention, those skilled in the art will realize that many variations and modifications may be made to affect the described invention and still be within the scope of the claimed invention. Additionally, many of the elements indicated above may be altered or replaced by different elements which will provide the same result and fall within the spirit of the claimed invention. It is the intention, therefore, to limit the invention only as indicated by the scope of the claims.

Claims

1. A display assembly for mounting to a roof of a vehicle comprising: a housing adapted to be mounted to the roof of the vehicle, said housing defining at least a bottom wall, a front wall, and a rear wall;a first and second electronic display positioned in a back to back arrangement within the housing, wherein each of said first and second electronic displays has a front surface and a rear surface;a first and second transparent panel, wherein each of said first and second transparent panels are positioned in front of the front surface of one of the first and second electronic displays;a first and second thermal plate, wherein each of said first and second thermal plates are positioned behind the rear surface of one of the first and second electronic displays;an open loop pathway comprising: an inlet aperture located in the housing for ingesting ambient air;a first and second open loop channel, wherein each of the first and second open loop channels are located between one of the first and second thermal plates, respectively, and the rear surface of one of the first and second electronic displays, respectively;a number of entrance apertures located on each of the first and second thermal plates, wherein each of said entrance apertures are configured to permit gaseous communication between the inlet aperture and the first and second open loop channels, respectively;an exhaust aperture located in the housing for exhausting ambient air;a number of exit apertures located on each of the first and second thermal plates, wherein each of said exit apertures are configured to permit gaseous communication between the exhaust aperture and the first and second open loop channels, respectively; andone or more open loop fans positioned vertically along said rear wall of said housing between each of the number of exit apertures and the exhaust aperture;wherein the one or more open loop fans, when operated, are configured to pull a flow of ambient air through said inlet aperture, split said flow after entering the inlet aperture such that a portion of said flow travels through each of said entrance apertures and each of said first and second open loop channels, through each of said number of exit apertures, and rejoin said split flow, after exiting each of said exit apertures, prior to pushing the flow through said exhaust aperture to exhaust said flow; anda closed loop pathway comprising: a first and second closed loop channel, wherein each of said first and second closed loop channels are located between one of the first and second transparent panels, respectively, and one of the first and second electronic displays, respectively;a sealed electronics compartment defined by the first and second thermal plates, wherein the sealed electronics compartment is configured to permit gaseous communication with each of the first and second closed loop channels, and wherein said sealed electronics compartment defines a plenum which accepts only circulating gas; anda plurality of closed loop fans spaced apart between said first and second electronic displays and along a bottom wall of siad housing;wherein said plurality of closed loop fans are configured to circulate circulating gas vertically through said first and second closed loop channels and the sealed electronics compartment;a number of electronic components placed within the sealed electronics compartment, wherein said number of electronic components are selected from the group consisting of: power modules, video players, eletronic data storage devices, microprocessors, wireless transmitters/receivers, and timing and control boards.

2. The display assembly of claim 1, wherein: at least some of the number of electronic components are mounted to a rear surface of at least one of the first and second thermal plates.

3. The display assembly of claim 1, further comprising: a number of feet attached to said housing, wherein each of said feet has a lower surface which is configured to contact, and substantially match the pitch of, an upper surface of the roof of the vehicle.

4. The display assembly of claim 1, wherein: each of the number of entrance apertures are spaced apart along a first end of each of the first and second thermal plates; andeach of the number of exit apertures are spaced apart along a second end of the first and second thermal plates.

5. The display assembly of claim 4, wherein: each of the number of entrance apertures are vertically spaced apart; andeach of the number of exit apertures are vertically spaced apart.

6. The display assembly of claim 5, wherein: each of said number of entrance apertures are positioned outside of the sealed electronics compartment; andeach of said number of exit apertures are positioned outside of the sealed electronics compartment.