Source: http://www.google.com/patents/US20110085301?ie=ISO-8859-1
Timestamp: 2016-02-07 07:11:45
Document Index: 643230583

Matched Legal Cases: ['Application No. 61', 'Application No. 61', 'application No. 61', 'application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 61', 'Application No. 61', 'application No. 61', 'application No. 61', 'Application No. 61']

Patent US20110085301 - Heat Exchanger for Back to Back Electronic Displays - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA cooling assembly for a dual electronic image assembly having an open and closed gaseous loop. A closed gaseous loop allows circulating gas to travel across the front surface of a pair of electronic image assemblies and through a heat exchanger. An open loop allows ambient gas to pass through the heat...http://www.google.com/patents/US20110085301?utm_source=gb-gplus-sharePatent US20110085301 - Heat Exchanger for Back to Back Electronic DisplaysAdvanced Patent SearchPublication numberUS20110085301 A1Publication typeApplicationApplication numberUS 12/753,298Publication dateApr 14, 2011Priority dateMar 3, 2008Also published asUS8351014, US9030641, US20130279154Publication number12753298, 753298, US 2011/0085301 A1, US 2011/085301 A1, US 20110085301 A1, US 20110085301A1, US 2011085301 A1, US 2011085301A1, US-A1-20110085301, US-A1-2011085301, US2011/0085301A1, US2011/085301A1, US20110085301 A1, US20110085301A1, US2011085301 A1, US2011085301A1InventorsWilliam R. DunnOriginal AssigneeManufacturing Resources International, Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (60), Non-Patent Citations (1), Referenced by (17), Classifications (10), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetHeat Exchanger for Back to Back Electronic Displays
US 20110085301 A1Abstract
a pair of front display surfaces spaced apart from the front portion of each electronic image assembly; a pair of channels defined by the space between the front display surface and the front portion of each electronic image assembly; a heat exchanger in gaseous communication with the channels, the heat exchanger having first and second gas pathways, where the first gas pathway is in gaseous communication with the channels; a first fan assembly positioned so as to force circulating gas through the channels and the first gas pathway; and a second fan assembly positioned so as to force ambient gas through the second gas pathway. 2. The cooling system of claim 1 wherein:
a pair of electronic image assemblies, each assembly having a front and a rear portion and placed so that the rear portions are facing one another; front display surfaces spaced apart from the front portion of each electronic image assembly; channels defined by the space between each front display surface and the front portion of each electronic image assembly; a heat exchanger having first and second gas pathways, where the first pathway is in gaseous communication with the channels; a housing containing the electronic image assemblies, front display surfaces, channels, and heat exchanger, where the housing, channels, and first gas pathway of the heat exchanger define a closed gaseous loop; a first fan assembly placed within the closed gaseous loop; an inlet and exhaust aperture in the housing, where the inlet aperture, second pathway of the heat exchanger, and exhaust aperture define an open gaseous loop; and a second fan assembly placed within the open gaseous loop. 10. The electronic display assembly of claim 9 wherein:
second channels defined by the space between each plate and the rear portion of each electronic image assembly;
a channel defined by the space between the front display surface and the LCD;
a pair of substantially parallel plates placed between the two LED backlights; a third channel defined by the space between the plates, where the first, second, and third channels are in gaseous communication; a heat exchanger placed between the plates and having first and second gas pathways, where the first pathway is in gaseous communication with the first, second, and third channels; a first fan positioned so as to force circulating gas through the channels and the first gas pathway; and a second fan positioned so as to force ambient gas through the second gas pathway. 17. The dual electronic display assembly of claim 16 wherein:
18. The dual electronic display assembly of claim 16 wherein:
19. The dual electronic display assembly of claim 17 wherein:
an electronic component placed between the plates. Description
[0001] This application is a non-provisional of U.S. Application No. 61/252,295 filed Oct. 16, 2009 and is hereby incorporated by reference as if fully cited herein. This application is a continuation in part of U.S. application Ser. No. 12/641,468 filed Dec. 18, 2009, which is a non-provisional of U.S. Application No. 61/138,736 filed Dec. 18, 2008 each of which are hereby incorporated by reference as if fully cited herein. This application is a continuation in part of U.S. application Ser. No. 12/411,925 filed Mar. 26, 2009, which is a non-provisional application of U.S. provisional application No. 61/039,454 filed Mar. 26, 2008 each of which are hereby incorporated by reference as if fully cited herein. This application is a continuation-in-part of U.S. application Ser. No. 12/556,029 filed Sep. 9, 2009, which is a non-provisional application of U.S. provisional application No. 61/095,615 filed Sep. 9, 2008 each of which are hereby incorporated by reference as if fully cited herein. This application is a continuation-in-part of U.S. application Ser. No. 12/234,307 filed Sep. 19, 2008, which is a non-provisional application of U.S. Application No. 61/033,064 filed Mar. 3, 2008, each of which are hereby incorporated by reference in their entirety as if fully cited herein. This application is a continuation-in-part of U.S. application Ser. No. 12/234,360 filed Sep. 19, 2008, which is a non-provisional application of U.S. Application No. 61/053,713 filed May 16, 2008 each of which are hereby incorporated by reference in their entirety as if fully cited herein. This application is a continuation-in-part of U.S. application Ser. No. 12/237,365 filed Sep. 24, 2008, which is a non-provisional application of U.S. Application No. 61/057,599 filed May 30, 2008 each of which are hereby incorporated by reference in their entirety as if fully cited herein. This application is a continuation-in-part of U.S. application Ser. No. 12/235,200 filed Sep. 22, 2008, which is a non-provisional of U.S. Application No. 61/076,126 filed Jun. 26, 2008 each of which are hereby incorporated by reference in their entirety as if fully cited herein. This application is a continuation-in-part of U.S. application Ser. No. 12/620,330 filed Nov. 17, 2009, which is a non-provisional of U.S. Application No. 61/115,333 filed Nov. 17, 2008 each of which are hereby incorporated by reference in their entirety as if fully cited herein. This application is a continuation-in-part of U.S. application Ser. No. 12/556,209 filed Sep. 9, 2009, which is a non-provisional application of U.S. provisional application No. 61/095,616 filed Sep. 9, 2008 each of which are hereby incorporated by reference as if fully cited herein. This application is a continuation in part of U.S. application Ser. No. 12/706,652 filed Feb. 16, 2010, which is a non-provisional application of U.S. provisional application No. 61/152,879 filed Feb. 16, 2009 each of which are hereby incorporated by reference as if fully cited herein. This application is a continuation in part of U.S. application Ser. No. 12/630,469 filed Dec. 3, 2009. This application is a continuation-in-part of U.S. application Ser. No. 12/234,182 filed Sep. 19, 2008, which is a non-provisional application of U.S. Application No. 61/033,064 filed Mar. 3, 2008, each of which are hereby incorporated by reference in their entirety as if fully cited herein.
[0003] Electronic displays are now being used in outdoor environments and other applications where they may be exposed to high ambient temperatures and/or direct sunlight. In many climates, radiative heat transfer from the sun through a display window becomes a major factor. In many applications and locations 200 Watts or more of power through such a display window is possible. Furthermore, the market is demanding larger screen sizes for displays. With increased electronic display screen size and corresponding display window size more heat will be generated and more heat will be transmitted into the displays. Also, when displays are used in outdoor environments the ambient air may contain contaminates (dust, dirt, pollen, water vapor, smoke, etc.) which, if ingested into the display for cooling the interior can cause damage to the interior components of the display.
[0004] A large fluctuation in temperature is common in the devices of the past. Such temperature fluctuation adversely affects the electronic components in these devices; both performance and lifetime may be severely affected. Thus, there exists a need for a cooling system for electronic displays which are placed within environments having high ambient temperatures, possibly contaminates present within the ambient air, and even placed in direct sunlight.
[0005] Exemplary embodiments may comprise two separate flow paths for gas through an electronic display. A first flow path may be a closed loop and a second flow path may be an open loop. The closed loop path forces circulating gas across the front surface of the image assembly, continues behind the image assembly where it may enter a heat exchanger, finally returning to the front surface of the image assembly. The open loop path may draw ambient gas (ex. ambient air) through the display (sometimes through a heat exchanger, behind an image assembly, or both) and then exhaust it out of the display housing. A heat exchanger may be used to transfer heat from the circulating gas to the ambient gas. In alternative embodiments, the ambient gas may also be forced behind the image assembly (sometimes a backlight), in order to cool the image assembly and/or backlight assembly (if a backlight is necessary for the particular type of display being used). A cross-flow heat exchanger may be used in an exemplary embodiment.
[0006] In an exemplary embodiment, two electronic displays are placed back-to-back and share a single heat exchanger. In this embodiment, two closed loop paths may travel though a single housing in order to cool the displays.
[0009] FIG. 1 is an exploded view of an exemplary embodiment.
[0010] FIG. 2A is a perspective view of one embodiment for the back-to-back displays showing cutting planes B-B and C-C.
[0011] FIG. 2B is a section view along cutting plane B-B shown in FIG. 2A.
[0012] FIG. 2C is a section view along cutting plane C-C shown in FIG. 2A.
[0013] FIG. 3A is a perspective view of another embodiment for the back-to-back displays showing cutting planes B-B and C-C.
[0014] FIG. 3B is a section view along cutting plane B-B shown in FIG. 3A.
[0015] FIG. 3C is a section view along cutting plane C-C shown in FIG. 3A.
[0016] FIG. 1 provides an exploded view of an exemplary embodiment. In the exemplary embodiments, two electronic image assemblies are placed back to back in a substantially symmetrical manner. In this particular embodiment 10, LED backlit LCD displays are used but the techniques taught herein could be applied to any electronic assembly for generating an image, including but not limited to: light emitting diode (LED), organic light emitting diode (OLED), field emitting displays (FED), light-emitting polymers (LEP), plasma displays, and any other flat/thin panel displays. As shown in FIG. 1, each LCD assembly 85 has a front portion 86 and rear portion 84 where the front portion 86 produces the image and the rear portion 84 faces the oppositely-facing LCD assembly 85. A LED backlight 140 is placed adjacent to the rear portion 84 of the LCD assemblies 85, as is known in the art. Edge-lit LED backlights or direct-lit LED backlights could be used with the various embodiments herein. For the particular embodiment shown in FIG. 1, a direct-lit LED backlight is preferable.
[0017] The exemplary embodiment shown in FIG. 1 can cool various portions of the assembly shown, including but not limited to the rear surfaces of the LED backlights 140. Ambient gas 40 may be drawn into the display housing 70 through the inlet apertures 179 and forced along the rear surface of the LED backlights 140. The fan assembly 60 may be used to draw the ambient gas 40 into the display housing 70 and along the rear surface of the LED backlights 140. Although shown at the bottom of the display housing 70, the fan assembly 60 can be placed anywhere in the assembly. For example, fans could also be placed at the top of the housing 70 either instead of or in addition to the ones shown at the bottom in FIG. 1. Further, the fans may draw the ambient air from below the housing, above the housing, or from the sides.
[0018] In this embodiment, a heat exchanger 45 is placed between the two backlights 140. A protective transparent plate 90 may be placed in front of the front portion of the LCD assembly 85. The space between the protective transparent plate 90 and the LCD assembly defines a channel where circulating gas may travel in order to cool the front portion 86 of the LCD assembly 85. The circulating gas then travels through a first pathway 44 of the heat exchanger 45 in order to be cooled by the ambient gas 145. The circulating gas may be forced through the channel and the heat exchanger 45 by closed loop fan assembly 50. Ambient gas 145 may be directed through a second pathway 46 of the heat exchanger 45. The ambient gas 145 may be forced through the heat exchanger 45 by the fans 60 or may be forced using a separate fan 245, controlled specifically for the heat exchanger 45. The protective transparent plate 90 may be any rigid transparent material. Exemplary embodiments may use glass for the plate 90. Further embodiments may combine anti-reflective layers and/or polarizers with the plate 90 to reduce the amount of reflected light. Ideally, these could be bonded to a plate of glass using pressure sensitive adhesive (PSA) and would preferably be index-matched. In some embodiments, the plate 90 may comprise two or more pieces of glass bonded together with index-matching optical adhesive.
[0019] FIG. 2A provides a perspective view of an embodiment with the housing removed and showing the plates 90 installed in front of the LCD assemblies 85. This figure shows the placement for cutting planes B-B and C-C which provide the section views in FIGS. 2B and 2C respectively. Cutting plane B-B passes vertically down the center of the assembly and through the heat exchanger 45. Cutting plane C-C passes horizontally through the center of the assembly.
[0020] A second surface 226 may be placed behind the rear surface of each of the backlights 140. The space between the rear surface of the backlight 140 and this second surface 226 may define an open loop channel 225 through which the ambient gas 40 may travel in order to cool the backlight 140 (or the electronic image assembly if no backlight is used). Exemplary embodiments of the LED backlights 140 would have a low level of thermal resistance between the front surface containing the LEDs and the rear surface which faces the second surface 226 and is in contact with the ambient gas 40. A metallic PCB may be used as the mounting structure for this purpose. The rear surface of the backlight 140 may contain a thermally conductive material, such as a metal. Aluminum may be an exemplary material for the rear surface.
[0021] FIG. 2B provides the section view from cutting plane B-B shown in FIG. 2A. In this particular embodiment, ambient gas 145 travels through the heat exchanger 45 while ambient gas 40 travels through the open loop channels 225. Thus, ambient gas 145 may be used to remove heat from the circulating gas and ambient gas 40 may be used to remove heat from the LED backlight 140. As can be readily observed in this view, the LED backlight 140 and LCD assembly 85 could easily be substituted with any other electronic image assembly (such as those listed above or below). It should be noted that there is no requirement that ambient gas 145 and 40 be different in any way. For example, both ambient gas 145 and 40 may enter through the same inlet in the housing and even be exhausted out of the same exhaust aperture in the housing. Further, a single fan assembly can force both ambient gas 145 and 40. They are simply shown with different numeral callouts so that one can see the separate passages for the ambient gas (i.e. one through the heat exchanger 45 and another through the optional open loop channels 225). As will be discussed further below, the open loop channels 225 are not required for all embodiments. This is especially true for electronic displays that do not require a backlight or displays which contain a backlight that does not produce relatively large amounts of heat. It is specifically contemplated that OLED displays could be used where only ambient gas 145 would be drawn into the display and through the heat exchanger 45 (although ambient gas could be used to cool other portions of the display, open loop channels 225 may not be required with OLED embodiments).
[0022] FIG. 2C provides the section view from cutting plane C-C shown in FIG. 2A. The circulating gas preferably travels in a closed loop where it is drawn through the first gas pathway 44 of the heat exchanger 45 and then directed into the entrances 110 of the channels 30. As discussed above, the channels 30 may be defined by the space between the front surface of the LCD assembly 85 (or other electronic image assembly) and the transparent plate 90. As mentioned above, sunlight (or high ambient surrounding temperatures) can cause a buildup of heat on the LCD assembly 85. As the circulating gas travels through the channel 30, it may remove heat from the front surface of the LCD assembly 85. The circulating gas may then be directed out of the channel 30 through the exit 120. The circulating gas may then be re-directed into the first gas pathway 44 of the heat exchanger 45 so that it may be cooled by the ambient gas 145 (which may be travelling through the second gas pathway 46 of the heat exchanger 45).
[0023] The closed loop fan assembly 50 may be placed so that the circulating gas will be forced through this closed loop. While the figure shows the placement of the fan assembly 50 after and away from the heat exchanger 45, it should be noted that the fan assembly 50 could be placed anywhere in the system so that adequate velocity and flow of the circulating gas is achieved. Thus, some embodiments could even use two or more fan assemblies, placing them along two opposing edges (entrance and exit) of a heat exchanger 45. The circulating gas could be ‘pulled’ across the front of the electronic image assembly and ‘pushed’ through the heat exchanger 45. This is not required however; other embodiments may pull the isolated gas through the heat exchanger 45 and ‘push’ it through the channel 30. Other embodiments may push the isolated gas only across the front of the electronic image assembly. Because the various fan assemblies described herein can be placed in multiple orientations, when referring to the placement of the various fan assemblies, the terms ‘push’, ‘pull’, ‘force’, and ‘draw’ will be used interchangeably and any orientation may be used with the various embodiments herein.
[0024] Various electronic components could be placed within the path of the circulating gas by placing them within cavity 41 which includes the heat exchanger 45. The circulating gas may be used to extract heat from these devices as well. The electronic components may be any components or assemblies used to operate the display including, but not limited to: transformers, circuit boards, resistors, capacitors, batteries, power modules, motors, inductors, transformers, illumination devices, wiring and wiring harnesses, lights, thermo-electric devices, and switches. In some embodiments, the electrical components may also include heaters, if the display assembly is used in cold-weather environments.
[0025] In some embodiments, the ambient gas 145 and 40 may be air conditioned (or otherwise cooled) prior to being drawn through the heat exchanger 45. This is not required however; as it has been found that proper design of the heat exchanger 45 and other various components can provide adequate cooling in most environments without additional air conditioning.
[0026] Although not required, it is preferable that the circulating gas and ambient gas 145 do not mix. This may prevent any contaminates and/or particulate that is present within the ambient gas 145 from harming the interior of the display. In a preferred embodiment, the heat exchanger 45 would be a cross-flow heat exchanger. However, many types of heat exchangers are known and can be used with any of the embodiments herein. The heat exchanger 45 may be a cross-flow, parallel flow, or counter-flow heat exchanger. In an exemplary embodiment, the heat exchanger 45 would be comprised of a plurality of stacked layers of thin plates. The plates may have a corrugated, honeycomb, or tubular design, where a plurality of channels/pathways/tubes travel down the plate length-wise. The plates may be stacked such that the directions of the pathways are alternated with each adjacent plate, so that each plate's pathways are substantially perpendicular to the pathways of the adjacent plates. Thus, ambient gas or circulating gas may enter an exemplary heat exchanger only through plates whose channels or pathways travel parallel to the path of the gas. Because the plates are alternated, the circulating gas and ambient gas may travel in plates which are adjacent to one another and heat may be transferred between the two gases without mixing the gases themselves (if the heat exchanger is adequately sealed, which is preferable but not required).
[0027] In an alternative design for a heat exchanger, an open channel may be placed in between a pair of corrugated, honeycomb, or tubular plates. The open channel may travel in a direction which is perpendicular to the pathways of the adjacent plates. This open channel may be created by running two strips of material or tape (esp. very high bond (VHB) tape) between two opposite edges of the plates in a direction that is perpendicular to the direction of the pathways in the adjacent plates. Thus, gas entering the heat exchanger in a first direction may travel through the open channel (parallel to the strips or tape). Gas which is entering in a second direction (substantially perpendicular to the first direction) would travel through the pathways of the adjacent plates).
[0028] Other types of cross-flow heat exchangers could include a plurality of tubes which contain the first gas and travel perpendicular to the path of the second gas. As the second gas flows over the tubes containing the first gas, heat is exchanged between the two gases. Obviously, there are many types of cross-flow heat exchangers and any type would work with the embodiments herein.
[0029] An exemplary heat exchanger may have plates where the sidewalls have a relatively low thermal resistance so that heat can easily be exchanged between the two gases. A number of materials can be used to create the heat exchanger. Preferably, the material used should be corrosion resistant, rot resistant, light weight, and inexpensive. Metals are typically used for heat exchangers because of their high thermal conductivity and would work with these embodiments. However, it has been discovered that plastics and composites can also satisfy the thermal conditions for electronic displays. An exemplary embodiment would utilize polypropylene as the material for constructing the plates for the heat exchanger. It has been found that although polypropylene may seem like a poor thermal conductor, the large amount of surface area relative to a small sidewall thickness, results in an overall thermal resistance that is very low. Thus, an exemplary heat exchanger would be made of plastic and would thus produce a display assembly that is thin and lightweight. Specifically, corrugated plastic may be used for each plate layer where they are stacked together in alternating fashion (i.e. each adjacent plate has channels which travel in a direction perpendicular to the surrounding plates).
[0030] The circulating gas and ambient gas can be any number of gaseous matters. In some embodiments, air may be used as the gas for both. Preferably, the circulating gas should be substantially clear, so that when it passes in front of the electronic image assembly it will not affect the appearance of the image to a viewer. The circulating gas would also preferably be substantially free of contaminates and/or particulate (ex. dust, dirt, pollen, water vapor, smoke, etc.) in order to prevent an adverse effect on the image quality and damage to the internal electronic components. It may sometimes be preferable to keep the ambient gas within the open loop from having contaminates as well. An optional filter may be used to ensure that the air (either in the closed or open loop) stays free of contaminates. However, in an exemplary embodiment the open loops (channels 225 and the second gas pathway 46 through the heat exchanger 45) may be designed so that contaminates could be present within the ambient gas 145 or 40 but this will not harm the display. In these embodiments, the heat exchanger 45 (and the optional channels 225) should be properly sealed so that any contaminates in the ambient gas 145 or 40 would not enter sensitive portions of the display. Thus, in these exemplary embodiments, ingesting ambient air for the ambient gas 145 or 40, even if the ambient air contains contaminates, will not harm the display. This can be particularly beneficial when the display is used in outdoor environments or indoor environments where contaminates are present in the ambient air.
[0031] FIG. 3A provides a perspective view of another embodiment where the housing has been removed. In this embodiment, the previously-shown open loop channels 225 behind the backlight 140 are not used. This figure shows the placement for cutting planes B-B and C-C which provide the section views in FIGS. 3B and 3C respectively. Cutting plane B-B passes vertically down the center of the assembly and through the heat exchanger 45. Cutting plane C-C passes horizontally through the center of the assembly.
[0032] FIG. 3B provides the section view from cutting plane B-B shown in FIG. 3A. In this particular embodiment, ambient gas 145 only travels through the heat exchanger 45. Thus, only ambient gas 145 may be used to remove heat from the circulating gas. As can be readily observed in this view, the LED backlight 140 and LCD assembly 85 could easily be substituted with any other electronic image assembly (such as those listed above or below). In some embodiments, the electronic image assembly could be placed in conductive thermal communication with the heat exchanger 45 so that the heat from the electronic image assembly could be distributed into the heat exchanger 45 and removed by ambient gas 145. Thus, in some embodiments the backlight 140 could have thermal communication with the heat exchanger 45. The thermal communication would preferably be conductive thermal communication.
[0033] FIG. 3C provides the section view from cutting plane C-C shown in FIG. 3A. The circulating gas preferably travels in a closed loop where it is drawn through the first gas pathway 44 of the heat exchanger 45 and then directed into the entrances 110 of the channels 30. As discussed above, the channels 30 may be defined by the space between the front surface of the LCD assembly 85 (or other electronic image assembly) and the transparent plate 90. As mentioned above, sunlight (or high ambient surrounding temperatures) can cause a buildup of heat on the LCD assembly 85. As the circulating gas travels through the channel 30, it may remove heat from the front surface of the LCD assembly 85. The circulating gas may then be directed out of the channel 30 through the exit 120. The circulating gas may then be re-directed into the first gas pathway 44 of the heat exchanger 45 so that it may be cooled by the ambient gas 145 (which is travelling through the second gas pathway 46 of the heat exchanger 45).
[0034] A pair of plates 300 (or surfaces) may be used to define the cavity 41 (or channel) which contains the heat exchanger 45 and the circulating gas as it travels behind the electronic image assemblies. In some embodiments, the rear portions of the electronic image assemblies (sometimes containing a backlight and sometimes not) may be placed in thermal communication with the plates 300 so that heat may be transferred from the image assemblies to the plates 300 and eventually to the circulating gas (where it can then be removed as it passes through the heat exchanger 45). The thermal communication between the electronic image assemblies and the plates 300 should preferably be conductive thermal communication. The plates 300 could also be placed in conductive thermal communication with the heat exchanger 45. Thus, if using the LED backlights 140 these could be placed in conductive thermal communication with the plates 300. The plates should preferably have a low thermal resistance. A metallic substance may provide a good material for the plates 300. Aluminum would be an exemplary choice for plates 300.
[0035] As mentioned above, various electronic components could be placed within the path of the circulating gas by placing them within cavity 41 (or channel) which includes the heat exchanger 45. The circulating gas may be used to extract heat from these devices as well. The electronic components may be any components or assemblies used to operate the display including, but not limited to: transformers, circuit boards, resistors, capacitors, batteries, power modules, motors, inductors, transformers, illumination devices, wiring and wiring harnesses, lights, thermo-electric devices, and switches. In some embodiments, the electrical components may also include heaters, if the display assembly is used in cold-weather environments.
[0036] The embodiment shown in FIGS. 3A-3C may be used for a variety of applications. First, this embodiment may be preferable if the electronic image assembly being used does not require a backlight or does not produce a relatively large amount of heat from the rear side of the image assembly. Second, size or footprint may be an issue and this embodiment is thinner and possibly lighter than the embodiments that use the open channels 225. Costs can also be reduced as the additional fans/power supplies/controllers for ingesting ambient air 40 are no longer required. Specifically, the embodiment shown in FIGS. 3A-3C may be preferable for OLED applications or edge-lit LED backlit LCD applications. However, even the direct-lit LED backlight LCD designs could use this embodiment if the application allows. One example would be if high-efficiency LEDs are used for the backlight. Further, this embodiment could be used if the display is only subjected to direct sunlight but relatively low ambient temperatures.
[0037] The cooling system described herein may run continuously. However, if desired, temperature sensing devices (not shown) may be incorporated within the electronic display to detect when temperatures have reached a predetermined threshold value. In such a case, the various cooling fans may be selectively engaged when the temperature in the display reaches a predetermined value. Predetermined thresholds may be selected and the system may be configured to advantageously keep the display within an acceptable temperature range. Typical thermostat assemblies can be used to accomplish this task. Thermocouples may be used as the temperature sensing devices. The speed of the various fan assemblies can also be varied depending on the temperature within the display.
[0038] It should be particularly noted that the spirit and scope of the disclosed embodiments provides for the cooling of any type of electronic display. By way of example and not by way of limitation, embodiments may be used in conjunction with any of the following: LCD (all types), light emitting diode (LED), organic light emitting diode (OLED), field emitting display (FED), light emitting polymer (LEP), organic electro luminescence (OEL), plasma displays, and any other type of thin/flat panel display. Furthermore, embodiments may be used with displays of other types including those not yet discovered. In particular, it is contemplated that the system may be well suited for use with large (40 inches or more) LED backlit, high definition (1080i or 1080p or greater) liquid crystal displays (LCD). While the embodiments described herein are well suited for outdoor environments, they may also be appropriate for indoor applications (e.g., factory/industrial environments, spas, locker rooms, kitchens, bathrooms) where thermal stability of the display may be at risk.
[0039] 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 clock-wise 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.
[0040] It should also be noted that electronic image assemblies do not have to be used on both sides of the display. For example, one side may include an OLED display while the opposing side may be a static advertisement. Further, the same type of electronic image assembly does not have to be used on both sides of the display. For example, one side may contain an LED display while the second side contains an OLED display.
[0041] Having shown and described preferred embodiments, 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.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4093355 *Feb 4, 1977Jun 6, 1978General Motors CorporationSymmetrical internal heater for liquid crystal displayUS4593978 *Mar 19, 1984Jun 10, 1986Thomson-CsfSmectic liquid crystal color display screenUS4634225 *Dec 24, 1984Jan 6, 1987General Electric Co.Transflective liquid crystal display with integral heating unit and temperature sensorUS5029982 *Sep 11, 1989Jul 9, 1991Tandy CorporationLCD contrast adjustment systemUS5088806 *Jan 16, 1990Feb 18, 1992Honeywell, Inc.Apparatus and method for temperature compensation of liquid crystal matrix displaysUS5247374 *Apr 1, 1991Sep 21, 1993Stanley Electric Co., Ltd.Liquid crystal display device with common heater between two cellsUS5559614 *May 1, 1995Sep 24, 1996Motorola, Inc.Liquid crystal display with integral heater and method of fabricating sameUS5748269 *Nov 21, 1996May 5, 1998Westinghouse Air Brake CompanyEnvironmentally-sealed, convectively-cooled active matrix liquid crystal display (LCD)US5767489 *Oct 11, 1996Jun 16, 1998Hewlett-Packard CompanyEnhanced resolution liquid crystal microthermography method and apparatusUS5818010 *Oct 11, 1996Oct 6, 1998Smiths Industries PlcDisplay assembliesUS5869919 *Mar 12, 1997Feb 9, 1999Canon Kabushiki KaishaAir cooling for flat panel displaysUS5991153 *Oct 30, 1998Nov 23, 1999Lacerta Enterprises, Inc.Heat transfer system and method for electronic displaysUS6089751 *Dec 30, 1996Jul 18, 2000Honeywell Inc.Transparent temperature sensor for an active matrix liquid crystal displayUS6157432 *Jan 29, 1999Dec 5, 2000Hewlett-Packard CompanyHeated ferroelectric liquid crystal spatial light modulator with improved contrast, improved grayscale resolution, and decreased pixel sticking when operated in a non-DC balanced modeUS6191839 *May 3, 1999Feb 20, 2001Rockwell Collin, Inc.Patterned thermal sensorUS6392727 *Dec 31, 1998May 21, 2002Honeywell International Inc.Reduced reflectance polarized displayUS6417900 *Mar 19, 1998Jul 9, 2002Lg. Philips Lcd Co., Ltd.Liquid crystal display unit with conductive light-shielding member having substantially the same potential as common electrodeUS6493440 *Apr 23, 2001Dec 10, 2002Gilbarco Inc.Thermal management for a thin environmentally-sealed LCD display enclosureUS6535266 *Dec 16, 1999Mar 18, 2003Rockwell Collins, Inc.Closed loop LCD heater systemUS6628355 *Oct 27, 2000Sep 30, 2003Matsushita Electric Industrial Co., Ltd.Liquid crystal display panel including a light shielding film to control incident lightUS6839104 *Aug 6, 2001Jan 4, 2005Fujitsu Display Technologies CorporationCommon electrode substrate and liquid crystal display device having the sameUS6885412 *Aug 22, 2003Apr 26, 2005Sharp Kabushiki KaishaLiquid crystal display device, image shifting device, and image display apparatusUS6909486 *Feb 18, 2003Jun 21, 2005Ran-Hong Raymond WangLiquid crystal display viewable under all lighting conditionsUS6943768 *Feb 21, 2003Sep 13, 2005Xtellus Inc.Thermal control system for liquid crystal cellUS6961108 *Jul 16, 2004Nov 1, 2005Ran-Hong Raymond WangLiquid crystal display viewable under all lighting conditionsUS7059757 *Jul 2, 2003Jun 13, 2006Sharp Kabushiki KaishaLiquid crystal display deviceUS7083285 *May 24, 2004Aug 1, 2006Coretronic CorporationCooling structure for projection apparatusUS7284874 *Apr 29, 2005Oct 23, 2007Lg.Philips Lcd Co., Ltd.LED backlight unit including cooling structureUS20010001459 *Jan 12, 2001May 24, 2001Physical Optics CorporationMethod of manufacturing a diffuser master using a blasting agentUS20010019454 *Apr 24, 2001Sep 6, 2001Biljana Tadic-GalebProjection lens and systemUS20020033919 *Jan 29, 2001Mar 21, 2002Sanelle Joseph J.Super bright low reflectance liquid crystal displayUS20020101553 *Aug 11, 2001Aug 1, 2002Fujitsu LimitedLiquid-crystal display device having a shield shielding an electromagnetic wave radiated from one of a driver and an electrode lead-out lineUS20020126248 *Mar 6, 2002Sep 12, 2002Takamasa YoshidaDisplay deviceUS20020149714 *Apr 16, 2001Oct 17, 2002Robert AndersonRuggedized flat panel display assemblyUS20030007109 *May 16, 2002Jan 9, 2003Sang-Hoon ParkLiquid crystal displayUS20030104210 *Nov 6, 2002Jun 5, 2003Nitto Denko CorporationGlass-break preventing film like filter and plasma display apparatusUS20040036834 *Aug 22, 2003Feb 26, 2004Noriaki OhnishiLiquid crystal display device, image shifting device, and image display apparatusUS20040105159 *Sep 22, 2003Jun 3, 2004Saccomanno Robert J.High efficiency viewing screenUS20040165139 *Feb 21, 2003Aug 26, 2004Anderson Grady K.Liquid crystal cell platformUS20050012722 *Dec 31, 2003Jan 20, 2005Hwa-Su ChonTouch screenUS20050073632 *Feb 2, 2004Apr 7, 2005American Panel CorporationFlat panel display having integral heater, EMI shield, and thermal sensorsUS20050127796 *Oct 28, 2004Jun 16, 2005Olesen Lee D.Audio/video display equipment for gas pumpsUS20050213950 *Mar 18, 2005Sep 29, 2005Canon Kabushiki KaishaCooling device, and apparatus and method for manufacturing image display panel using cooling deviceUS20050286131 *Jun 25, 2004Dec 29, 2005Ragini SaxenaOptical compensation of cover glass-air gap-display stack for high ambient lightingUS20060082271 *Oct 14, 2005Apr 20, 2006Lee Seung MLight emitting device package and back light unit for liquid crystral display using the sameUS20060092348 *Oct 27, 2005May 4, 2006Lg, Philips Lcd Co., Ltd.Backlight unit and liquid crystal display with the sameUS20060132699 *Dec 20, 2005Jun 22, 2006Cho Joo-WoanCooling apparatus and liquid crystal display device having the sameUS20060177587 *Mar 17, 2006Aug 10, 2006Fuji Photo Film Co., Ltd.Optical compensatory sheet producing method and apparatus, thermal treating method and apparatus, and dust removing method and apparatusUS20060199514 *Nov 11, 2005Sep 7, 2006Sony CorporationCooling fan and image display apparatusUS20060209266 *Mar 16, 2006Sep 21, 2006Nec Viewtechnology, Ltd.Projection display apparatus using liquid cooling and air coolingUS20070019419 *Jul 22, 2005Jan 25, 2007Sony CorporationRadiator for light emitting unit, and backlight deviceUS20070103866 *Aug 18, 2006May 10, 2007Lg Electronics Inc.Flat display device and cooling apparatus for the sameUS20070140671 *Feb 20, 2007Jun 21, 2007Canon Kabushiki KaishaCooling Device, and Apparatus and Method for Manufacturing Image Display Panel Using Cooling DeviceUS20070151664 *Jun 30, 2006Jul 5, 2007Lg.Philips Lcd Co., Ltd.Cooling apparatus and method for manufacturing liquid crystal display device using the sameUS20070206158 *Jan 22, 2007Sep 6, 2007Seiko Epson CorporationOptical device and projectorUS20070212211 *Mar 6, 2007Sep 13, 2007Sony CorporationCross flow fan apparatus, electronic apparatus and impellerUS20100182562 *Jul 22, 2010Sanyo Electric Co., Ltd.Display DeviceUS20110013114 *Jan 20, 2011Manufacturing Resources International, Inc.Heat Exchanger for an Electronic DisplayJP2005134849A * Title not availableWO2008050660A2 *Oct 11, 2007May 2, 2008Nec Display Solutions LtdApparatus for cooling heat generating spot of electronic device, cooling method therefor, and liquid crystal projector apparatus* Cited by examinerNon-Patent CitationsReference1 *NAGOYA ELECTRIC WORKS CO LTD, 26 May 2005, Machine Translation of JP 2005-134849 A from Patent Abstracts of Japan website, Pages 1-15* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8081267Mar 8, 2010Dec 20, 2011Peerless Industries, Inc.Display enclosureUS8102483Nov 18, 2010Jan 24, 2012Peerless Industries, Inc.Display enclosureUS8212959Oct 25, 2011Jul 3, 2012Ciil Technologies, LlcDisplay enclosureUS8350984Dec 20, 2011Jan 8, 2013Ciil Technologies, Inc.Display enclosureUS8714665Jan 20, 2012May 6, 2014Ciil Technologies LlcEnclosed television with improved enclosure sealing arrangementUS8976313 *Apr 9, 2012Mar 10, 2015Samsung Electronics Co., Ltd.Outdoor display apparatusUS9022490Apr 21, 2014May 5, 2015Ciil Technologies, LlcEnclosed television with improved enclosure sealing arrangementUS9078345Jan 20, 2012Jul 7, 2015Ciil Technologies, LlcEnclosed television with improved cable cover sealing mechanismUS20100079948 *Apr 1, 2010Sanyo Electric Co., Ltd.Display DeviceUS20120255721 *Oct 11, 2012Samsung Electronics Co., Ltd.Outdoor display apparatusUS20140334100 *Dec 19, 2013Nov 13, 2014Lg Electronics Inc.Digital signageUSD669075Oct 27, 2011Oct 16, 2012Ciil Technologies, LlcDisplay enclosure for use with audio/visual devices or the likeCN102737558A *Apr 9, 2012Oct 17, 2012三星电子株式会社Outdoor display apparatusEP2801888A2 *Dec 19, 2013Nov 12, 2014LG Electronics, Inc.Digital signage with heat exhaustWO2014149773A1 *Mar 5, 2014Sep 25, 2014Manufacturing Resources International, Inc.Heat exchange assembly for an electronic displayWO2015006335A3 *Jul 8, 2014Nov 12, 2015Manufacturing Resources International, Inc.Figure eight closed loop cooling system for electronic displayWO2015168375A1 *Apr 30, 2015Nov 5, 2015Manufacturing Resources International, Inc.Back to back electronic display assembly* Cited by examinerClassifications U.S. Classification361/695International ClassificationH05K7/20Cooperative ClassificationF28F3/02, H05K7/20972, G02F1/133385, F28D9/00, H05K7/20154, F21V29/02European ClassificationH05K7/20Z10, G02F1/1333V2Legal EventsDateCodeEventDescriptionJun 22, 2010ASAssignmentOwner name: MANUFACTURING RESOURCES INTERNATIONAL, INC., GEORGFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DUNN, WILLIAM;REEL/FRAME:024574/0970Effective date: 20100518Nov 4, 2011ASAssignmentOwner name: BANK OF AMERICA, N.A., GEORGIAFree format text: SECURITY AGREEMENT;ASSIGNOR:MANUFACTURING RESOURCES INTERNATIONAL, INC.;REEL/FRAME:027175/0973Effective date: 20111020Jul 9, 2015ASAssignmentOwner name: FIFTH THIRD BANK, GEORGIAFree format text: SECURITY INTEREST;ASSIGNOR:MANUFACTURING RESOURCES INTERNATIONAL, INC.;REEL/FRAME:036088/0001Effective date: 20150630RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk 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