(12) United States Patent
`Dunn
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 8,854,595 B2
`Oct. 7, 2014
`
`US008854595 B2
`
`(54) CONSTRICTED CONVECTION COOLING
`SYSTEM FOR AN ELECTRONIC DISPLAY
`
`(75) Inventor: William Dunn, Alpharetta, GA (US)
`(73) Assignee: Manufacturing Resources
`International, Inc., Alpharetta, GA (US)
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 1282 days.
`(21) Appl. No.: 12/411,925
`
`(*) Notice:
`
`1-1.
`(22) Filed:
`(65)
`
`Mar. 26, 2009
`Prior Publication Data
`US 2009/O244472 A1
`Oct. 1, 2009
`Related U.S. Application Data
`(63) Continuation-in-part of application No. 12/234,307.
`filed on Sep. 19, 2008, now Pat. No. 8,767,165, and a
`continuation-in-part of application No. 12/234,360,
`filed on Sep. 19, 2008, and a continuation-in-part of
`application No. 12/237,365, filed on Sep. 24, 2008,
`and a continuation-in-part of application No.
`12/235,200, filed on Sep. 22, 2008.
`60) Provisional application No. 61/039,454, filed on Mar.
`(60) 26, 2008, R application No. 6,700sois.
`filed on Sep. 9, 2008, provisional application No.
`61/095,616, filed on Sep. 9, 2008, provisional
`application No. 61/115,333, filed on Nov. 17, 2008,
`rovisional application No. 61/138.736, filed on Dec
`F. 2008 FE a slication No. 61f152 so.
`filed on i. 16, 2009 El application No.
`61/033.064 filed O Mar 3, 2008 provisional
`a
`lication No 61 f()53,713 filed on Ma 16, 2008
`R application No 61 f057,599 filed on May
`30, 2008, provisional application No. 61 f()76,126
`filed on Jun 26, 2008
`s u-1- Ys
`• 1- sis
`
`(51) Int. Cl.
`GO2F L/333
`H05K 7/20
`
`(2006.01)
`(2006.01)
`
`60
`
`
`
`(52) U.S. Cl.
`CPC ...... H05K 7/20972 (2013.01); G02F I/133385
`(2013.01)
`USPC ............................ 349/161; 361/694; 361/695
`(58) Fist of Classificationss"s. 361/692. 694-696:
`165/104.34, 121
`See application file for complete search history.
`
`(56)
`
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`Zeef, Hubing, EMC analysis of 18' LCDMonitor, Aug. 2000, 1 page.
`
`Primary Examiner — Jerry Blevins
`(74) Attorney, Agent, or Firm - Standley Law Group LLP
`(57)
`ABSTRACT
`Preferred embodiments provide a cooling system for an elec
`tronic display. A constricted convection channel is used to
`force cooling air against a posterior Surface of the electronic
`display. Fans may be used to propel or pull air through the
`constricted convection channel in a Substantially uniform
`manner. A refrigeration unit orthermoelectric module may be
`employed to cool or heat the air traveling through the con
`stricted convection channel. Some embodiments include a
`closed loop which extracts heat (or adds heat) to the front
`display Surface.
`
`20 Claims, 10 Drawing Sheets
`
`SEC et al. v. MRI
`SEC Exhibit 1001.001
`IPR 2023-00199
`
`

`

`US 8,854,595 B2
`Page 2
`
`(56)
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`SEC et al. v. MRI
`SEC Exhibit 1001.002
`IPR 2023-00199
`
`

`

`U.S. Patent
`
`Oct. 7, 2014
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`Sheet 1 of 10
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`US 8,854,595 B2
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`SEC et al. v. MRI
`SEC Exhibit 1001.003
`IPR 2023-00199
`
`

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`U.S. Patent
`
`Oct. 7, 2014
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`Sheet 2 of 10
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`US 8,854,595 B2
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`SEC et al. v. MRI
`SEC Exhibit 1001.004
`IPR 2023-00199
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`U.S. Patent
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`Oct. 7, 2014
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`Sheet 3 of 10
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`US 8,854,595 B2
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`SEC et al. v. MRI
`SEC Exhibit 1001.005
`IPR 2023-00199
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`U.S. Patent
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`Oct. 7, 2014
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`Sheet 4 of 10
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`US 8,854,595 B2
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`SEC et al. v. MRI
`SEC Exhibit 1001.006
`IPR 2023-00199
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`U.S. Patent
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`Oct. 7, 2014
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`Sheet 5 of 10
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`US 8,854,595 B2
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`Fis 5 A
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`SEC et al. v. MRI
`SEC Exhibit 1001.007
`IPR 2023-00199
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`U.S. Patent
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`US 8,854,595 B2
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`CD cò
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`Fig. 5D
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`Fig. 5F
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`SEC et al. v. MRI
`SEC Exhibit 1001.008
`IPR 2023-00199
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`U.S. Patent
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`Oct. 7, 2014
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`Sheet 7 of 10
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`SEC et al. v. MRI
`SEC Exhibit 1001.009
`IPR 2023-00199
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`U.S. Patent
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`Oct. 7, 2014
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`SEC et al. v. MRI
`SEC Exhibit 1001.010
`IPR 2023-00199
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`SEC Exhibit 1001.011
`IPR 2023-00199
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`SEC et al. v. MRI
`SEC Exhibit 1001.012
`IPR 2023-00199
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`1.
`CONSTRICTED CONVECTION COOLING
`SYSTEM FOR ANELECTRONIC DISPLAY
`
`US 8,854,595 B2
`
`CROSS-REFERENCE TO RELATED
`APPLICATIONS
`
`5
`
`This application is a non-provisional application of U.S.
`provisional application No. 61/039,454 filed Mar. 26, 2008
`and is hereby incorporated by reference as if fully cited
`herein. This application is a non-provisional application of 10
`U.S. provisional application No. 61/095,615 filed Sep. 9,
`2008 and is hereby incorporated by reference as if fully cited
`herein. This application is a non-provisional application of
`U.S. provisional application No. 61/095,616 filed Sep. 9,
`2008 and is hereby incorporated by reference as if fully cited 15
`herein. This application is a non-provisional of U.S. Applica
`tion No. 61/115,333 filed Nov. 17, 2008 and is hereby incor
`porated by reference as if fully cited herein. This application
`is a non-provisional application of U.S. application No.
`61/138,736 filed Dec. 18, 2008 and is hereby incorporated by
`reference as if fully cited herein. This application is a non
`provisional application of U.S. application No. 61/142,879
`filed Feb. 16, 2009. 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.
`
`35
`
`40
`
`25
`
`30
`
`TECHNICAL FIELD
`
`Exemplary embodiments generally relate to cooling sys
`tems and in particular to cooling systems for electronic dis
`plays.
`
`BACKGROUND OF THE ART
`
`45
`
`50
`
`Conductive and convective heat transfer systems for elec
`tronic displays are known. These systems of the past gener
`ally attempt to remove heat from the electronic components in
`a display through as many sidewalls of the display as possible. 55
`In order to do this, the systems of the past have relied prima
`rily on fans for moving air past the components to be cooled
`and out of the display. In some cases, the heated air is moved
`into convectively thermal communication with fins. Some of
`the past systems also utilize conductive heat transfer from
`heat producing components directly to heat conductive hous
`ings for the electronics. In these cases, the housings have a
`large Surface area, which is in convective communication
`with ambient air outside the housings. Thus, heat is trans
`ferred convectively or conductively to the housing and is then
`transferred into the ambient air from the housing by natural
`convection.
`
`65
`
`60
`
`2
`While such heat transfer systems have enjoyed a measure
`of success in the past, improvements to displays require even
`greater cooling capabilities.
`
`SUMMARY OF THE EXEMPLARY
`EMBODIMENTS
`
`In particular, cooling devices for electronic displays of the
`past have generally used convective heat dissipation systems
`that function to cool an entire interior of the display by one or
`more fans and fins, for example. By itself, this is not adequate
`in many climates, especially when 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 common. Further
`more, the market is demanding larger screen sizes for dis
`plays. With increased electronic display screen size and cor
`responding display window size more heat will be generated
`and more heat will be transmitted into the displays.
`In the past, many displays have functioned satisfactorily
`with ten or twelve inch screens. Now, many displays are in
`need of screens having sizes greater than or equal to twenty
`four inches that may require improved cooling systems. For
`example, some outdoor applications call for seventy inch
`screens and above. With increased heat production with the
`larger Screens and radiative heat transfer from the Sun through
`the display window, heat dissipation systems of the past,
`which attempt to cool the entire interior of the display with
`fins and fans, are no longer adequate.
`A large fluctuation in temperature is common in the
`devices of the past. Such temperature fluctuation adversely
`affects the electronic components in these devices. Whereas
`the systems of the past attempted to remove heat from the
`entire interior of the display, a preferred embodiment causes
`directed convective heat transfer from the anterior of the
`display. By the aspects described below, the present invention
`has made consistent cooling possible for electronic displays
`having screens of sizes greater than or equal to twelve inches.
`For example, cooling of a seventy inch screen can be
`achieved, even in extremely hot climates. Greater cooling
`capabilities are provided by the device and method described
`and shown in more detail below.
`An exemplary embodiment relates to a constricted convec
`tion cooling system and a method of cooling an electronic
`display. An exemplary embodiment includes an external
`housing and a constricted convection plate. The external
`housing preferably includes an air entrance end and an
`exhaust end. The air entrance end defines an entrance aper
`ture; while the exhaust end defines an exit aperture. The
`constricted convection plate is preferably mounted to the
`posterior display Surface. This posterior display Surface may
`be the posterior surface of the backlight assembly or the
`posterior Surface of any other thin panel display assembly
`(OLED, plasma, etc.). The constricted convection plate fur
`ther defines a constricted convection cooling channel imme
`diately behind the posterior display surface. The convection
`cooling channel may be adapted to receive air entering the
`entrance aperture and adapted to expel air through the exit
`aperture.
`The air entering the constricted convection cooling channel
`may be from a refrigerated air source in communication with
`the entrance opening, or alternatively may be ambient air
`from the display Surroundings. A septum in association with
`the external housing may be adapted to direct air into the
`constricted convection cooling channel. One or more fans
`may be used to draw the cooling air through the constricted
`convection cooling channel. In other embodiments, one or
`
`SEC et al. v. MRI
`SEC Exhibit 1001.013
`IPR 2023-00199
`
`

`

`US 8,854,595 B2
`
`3
`more fans may be used to force air through the constricted
`convection cooling channel. In exemplary embodiments, a
`plurality of fans are used to draw a substantially uniform flow
`of air through the constricted convection cooling channel.
`This helps to cool the display assembly in a uniform manner.
`This is particularly beneficial with an LED backlight, as
`individual LEDs may fail prematurely if exposed to high
`levels of heat for an extended period of time.
`The foregoing and other features and advantages will be
`apparent from the following more detailed description of the
`particular embodiments, as illustrated in the accompanying
`drawings.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`10
`
`15
`
`4
`The display 10 shown may be equipped with a backlight
`assembly. Modern displays are required to be extremely
`bright and this is especially true with displays that are
`intended for use in bright environments, especially outdoor
`environments which see direct or indirect Sunlight. Accord
`ingly, the backlight assembly may be required to be very
`bright and as such may generate a significant amount of heat.
`Exemplary embodiments provide excellent cooling of the
`backlight assembly, through the use of the constricted con
`vection system. Accordingly, it may be placed in direct Sun
`light. Although the cooling system may be used on Smaller
`displays, it is especially useful for larger LCD, LED, plasma,
`or organic light emitting diodes (OLED) displays. These
`screens, especially with displays over 24 inches, face signifi
`cant thermoregulatory issues in outdoor environments.
`It is to be understood that the spirit and scope of the dis
`closed embodiments includes cooling of displays including,
`but not limited to LCDs. By way of example and not by way
`of limitation, the present invention may be used in conjunc
`tion with displays selected from among LCD (including TFT
`or STN type), light emitting diode (LED), organic light emit
`ting diode (OLED), field emitting display (FED), cathode ray
`tube (CRT), and plasma displays. Furthermore, embodiments
`of the present invention may be used with displays of other
`types including those not yet discovered. In particular, it is
`contemplated that the present invention may be well suited
`for use with full color, flat panel OLED displays. While the
`embodiments described herein are well suited for outdoor
`environments, they may also be appropriate for indoor appli
`cations (e.g., factory environments) where thermal stability
`of the display may be at risk. Furthermore, while most of this
`disclosure is written in terms of cooling, embodiments
`enclosed herein may be utilized for heating in particular
`applications. The means for cooling the air in the cooling
`systems may be replaced with a means for heating the air. A
`heating system for an electronic display would allow usage in
`climates/environments normally too cold for liquid crystal or
`other like technologies.
`FIG. 2 is a posterior view of a display 10 that may be used
`in an exemplary embodiment. In a typical display, the display
`posterior 22 may include four mounting brackets 20. The four
`mounting brackets 20 are shown by way of example and not
`by way of limitation, exemplary embodiments may be used
`with various numbers of mounting brackets 20. The mounting
`brackets 20 serve to attach the constricted convection plate 30
`(shown in FIG. 3) to the display posterior 22. The height that
`the mounting brackets 20 extending from the display poste
`rior 22 define the depth of the constricted convection cooling
`channel 50 (shown in FIG. 5). This may also be described as
`the gap distance between the display posterior 22 and the
`constricted convection plate.
`In an exemplary embodiment, the display posterior 22 may
`be the posterior surface of a backlight assembly. The back
`light assembly may comprise a printed circuit board (PCB)
`with a plurality of LEDs mounted to the anterior surface. The
`PCB may have a low level of thermal resistance between the
`anterior and posterior Surfaces such that heat which is gener
`ated by the LEDs may be transferred to the posterior surface
`of the of the backlight assembly, and subsequently removed
`by air within the constricted convection channel. The PCB
`may comprise a metal core PCB and the posterior surface of
`the PCB may be metallic so that air within the constricted
`convection channel may cool the metallic posterior Surface
`(and Subsequently the backlight assembly) more easily and
`efficiently.
`FIG. 3 is an exemplary embodiment of the constricted
`convection plate 30. The constricted convection plate 30 may
`
`A better understanding of an exemplary embodiment will
`be obtained from a reading of the following detailed descrip
`tion and the accompanying drawings wherein identical refer
`ence characters refer to identical parts and in which:
`FIG. 1 is a perspective view of a display that may be used
`in an exemplary embodiment.
`FIG. 2 is a posterior view of a display that may be used in
`an exemplary embodiment.
`FIG. 3 is a perspective view of the constricted convection
`plate.
`FIG. 4 is an exploded view of a display that may be used in
`an exemplary embodiment and an exemplary embodiment of
`the constricted convection plate.
`FIG. 5A is a front perspective view of a fan and display that
`may be used in an exemplary embodiment and an exemplary
`embodiment of the constricted convection plate.
`FIGS. 5B through 5F show side views of additional
`embodiments for the constricted convection system.
`FIG. 6 is a perspective view of a double display housing
`utilizing an exemplary embodiment of the constricted con
`vection air cooling system for an electronic display.
`FIG. 7 is a posterior view of a display the may be found in
`a double display housing utilizing an exemplary embodiment
`of the constricted convection air cooling system for an elec
`tronic display.
`FIG. 8 is an exploded view of an exemplary embodiment of
`the constricted convection air cooling system for an elec
`tronic display.
`FIG. 9 is a perspective view of an exemplary embodiment
`of the constricted air cooling system for an electronic display
`of the present invention with an optional isolated gas cooling
`system.
`
`25
`
`30
`
`35
`
`40
`
`45
`
`DETAILED DESCRIPTION
`
`Exemplary embodiments relate to a cooling system for an
`electronic display and to combinations of the cooling system
`and the electronic display. Exemplary embodiments provide a
`constricted convection cooling system for an electronic dis
`play.
`FIG. 1 is a perspective view of a display that may be used
`in an exemplary embodiment. As may be appreciated, when
`the display 10 is exposed to heat and/or Sunlight, the tempera
`tures inside the display 10 will vary greatly without some kind
`of cooling device. As such, the electronics including the dis
`play screen 12 (e.g., LCD screen) will have a greatly reduced
`life span. By implementing certain embodiments of the cool
`ing system disclosed herein, temperature fluctuation is
`greatly reduced. This cooling capability has been achieved in
`spite of the fact that larger screens generate more heat than
`Smaller Screens.
`
`50
`
`55
`
`60
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`65
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`SEC et al. v. MRI
`SEC Exhibit 1001.014
`IPR 2023-00199
`
`

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`US 8,854,595 B2
`
`5
`have angled side panels 32. The angled side panels 32 are
`adapted to extend from the constricted convection plate 30
`and make contact with the display posterior 22 and direct air
`through the constricted convection channel 50 (shown in FIG.
`5). The constricted convection panel 30 may also be con
`structed to include access apertures 34. The access apertures
`34 are defined by the constricted convection plate 30 and
`allow access to hardware found on the display posterior 22;
`without the need to remove the constricted convection plate
`30. The access apertures 34 may be plugged before operation
`to maintain directed contact between the refrigerated air and
`the posterior display Surface 22.
`The width of the constricted convection channel 50 may
`vary according to the thermal requirements of a particular
`application. In some embodiments, the constricted convec
`tion channel 50 may be one-halfinch or less. In other embodi
`ments, the constricted convection channel 50 may be between
`one-half inch and one inch. In still other embodiments, the
`constricted convection channel 50 may be between one and
`five inches.
`FIG. 4 is an exploded view showing the relationship of a
`display 10 that may be used in an exemplary embodiment and
`an exemplary embodiment of the constricted convection plate
`30. As described above, the constricted convection plate 30
`may be attached to the display posterior 22 by the mounting
`brackets 20 (shown in FIG. 2). The size of the constricted
`convection plate 30 may be of sufficient size to cover the
`entire posterior display Surface 22. In other exemplary
`embodiments, the constricted convection plate 30 may only
`cover a portion of the posterior display surface 22. Therefore,
`thesize of the constricted convection plate 30 may be adjusted
`to provide sufficient cooling of the display posterior 22.
`In FIG. 5A, the constricted convection plate 30 is shown
`mounted to the display posterior 22. The mounting brackets
`20 (shown in FIG. 2) may be used to secure the constricted
`convection plate 30. The constricted convection plate 30 and
`the display posterior 22 define a constricted convection cool
`ing channel 50 immediately behind the display posterior 22.
`As discussed above, in Some embodiments the constricted
`convection cooling channel 50 may run the length and width
`of the display 10. In other embodiments, the constricted con
`vection cooling channel 50 may be only of sufficient size to
`provide thermal stability to the display 10.
`The constricted convection cooling system 54 may include
`a means for increasing the speed at which air travels through
`the constricted convection cooling channel 50. This means
`may include one or more fans 52 which may be positioned
`near an opening of the constricted convection cooling channel
`50. The fans 52 may either force the air through the con
`stricted convection channel 50 or pull the air through the
`constricted convection channel 50. Alternatively, a plurality
`of fans may be used to both push and pull air through the
`constricted convection cooling channel 50. The use of one or
`more fans 52 may provide increased velocity of the air trav
`eling through the constricted convection cooling channel 50.
`thus increasing the speed with which heat is transferred from
`the display posterior 22.
`In other exemplary embodiments, a means for cooling the
`air which passes through the constricted convection cooling
`channel 50 may be used. A means for cooling the air may
`include, but is not limited to, a conditioning unit, a refrigera
`tion unit, or any other means to decrease the temperature of
`the air passing through the constricted convection plate 30.
`Alternatively, ambient air from the Surroundings may be
`drawn in and forced within the constricted convection chan
`nel 50.
`
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`FIGS. 5B through 5F show side views of additional
`embodiments for the constricted convection system. In FIG.
`5B, one or more fans 52 are used to draw ambient air between
`the posterior display Surface 22 and the constricted convec
`tion plate 30. In FIG. 5C, one or more fans 52 are used to force
`ambient air between the posterior display surface 22 and the
`constricted convection plate 30. FIG.5D is similar to FIG.5B
`except that the housing 80 and the septum 90 are used to direct
`the flow of air. In FIG.5E, an air conditioning unit 110 is used
`to both cool the air and to force the cooled air between the
`posterior display Surface 22 and the constricted convection
`plate 30. Finally in FIG. 5F, an air conditioning unit 110 is
`used in combination with one or more fans 52.
`FIG. 6 is a double display housing 60 utilizing an exem
`plary embodiment of the constricted convection air cooling
`system 54. A constricted convection plate 30 is mounted to a
`display posterior 22. The constricted convection plate 30 and
`the display posterior 22 define a constricted convection cool
`ing channel 50 immediately behind the display posterior 22.
`An entrance opening 62 adapted to receive air is defined by
`the constricted convection plate 30. An exit opening 64
`adapted to expel air from the constricted convection cooling
`channel 50 is defined by the constricted convection plate 30
`and the display posterior 22. As above, the constricted con
`vection plate 30 may have access apertures 34. The access
`apertures 34 allow access to hardware located behind the
`constricted convection plate 30. The access apertures 34 may
`be closed before use using plugs or other similar devices (not
`shown in the Figures).
`An air source (not shown in the Figures) may be in com
`munication with the entrance opening 62. Air is forced
`through the entrance opening 62 and into the constricted
`convection channel 50. The constricted convection channel
`50 directs the air into contact with the display posterior 22
`increasing the heat transfer from the display. After passing
`over the display posterior 22, the air exits the constricted
`convection channel 50 through the exit opening 64. The
`expelled air may then pass through a portion of the double
`display housing 60 into the atmosphere.
`As above, a means for cooling the air (not shown in the
`Figures) forced into the constricted convection cooling chan
`nel 50 may be employed. The means for cooling the air may
`include, but is not limited to, a conditioning unit, a refriger
`ating unit, a thermoelectric unit, or any other means to
`decrease the temperature of the air before entering the con
`stricted convection cooling channel 50.
`FIG. 7 is a double display housing 60 that may use an
`exemplary embodiment of the constricted convection air
`cooling system 54. The display posterior 22 may include
`mounting brackets 20. The mounting brackets 20 are shown
`by way of example and not by way of limitation. The present
`invention may use various shapes and numbers of mounting
`brackets 20. The mounting brackets 20 may serve to attach the
`constricted convection plate 30 (shown in FIG. 3) to the
`display posterior 22. The height of the mounting brackets 20
`extend from the display posterior defines the depth of the
`constricted convection cooling channel 50 (shown in FIG. 5).
`Further embodiments may not utilize mounting brackets as
`they are not necessary to practice the invention.
`As with other exemplary embodiments, a means for forc
`ing air within the system and increasing the speed at which the
`air travels through the constricted convection cooling channel
`50 may be used. The means for increasing the air speed may
`be in association with either the entrance opening 62 or the
`exit opening 64. The means for increasing the air speed may
`include, but is not limited to, one or more fans (shown in FIG.
`5).
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`SEC et al. v. MRI
`SEC Exhibit 1001.015
`IPR 2023-00199
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`

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`7
`FIG. 8 is an exploded view of another embodiment of the
`constricted convection cooling system 54. The display 10
`may be encased in an external housing 80. The external hous
`ing 80 may have an air entrance end 82 and an exhaust end 84.
`The air entrance end 82 defines an entrance aperture 86. The
`exhaust end 84 defines an exit aperture 88. The constricted
`convection plate 30 and the display posterior 22 (not shown in
`FIG. 8) define a constricted convection cooling channel 50.
`The constricted convection plate 30 further defines an
`entrance opening 62 and an exit opening 64. The entrance
`opening may be adapted to receive air entering the entrance
`aperture 86. The exit opening may be adapted to expel air
`through the exit aperture 88.
`Septa 90 are associated with the external housing 80. The
`septa 90 may be adapted to prevent air from evading the
`constricted convection channel 50. The septa 90 may also be
`adapted to provide Support and an attachment port for the
`external housing 80.
`Air or another appropriate gas may be in gaseous commu
`nication with the entrance opening 86. The air then passes
`through the entrance opening 86 into a middle chamber 92.
`The middle chamber 92 is defined by the external housing 80
`and the constricted convection plate 30. Once the air enters
`the middle chamber it may be directed through the entrance
`opening 62. A septum 90 may be positioned to direct air into
`the entrance opening 62 and prevent the air evading the
`entrance opening 62. After passing through the entrance
`opening 62, the air may enter the constricted convection
`cooling channel 50. As the air passes through the constricted
`convection cooling channel heat is transferred from the dis
`play posterior to the air.
`After absorbing heat from the display posterior, the air may
`exit the constricted convection channel 50 through the exit
`opening 64. A septum 90 may be used to prevent the exiting
`air from evading the exit aperture 88, and to direct the air
`towards the exit aperture 88. The air is then expelled through
`the exit aperture 88 in to the surrounding atmosphere.
`To assist in the movement of air through the constricted
`convection channel 50, a means to force the air into the
`channel and increase the air speed may be used. Increasing
`the air speed and the volumetric flow rate of the air may allow
`for increased heat removal. The means to increase the air
`speed may include, but is not limited to, a fan 52. The fan 52
`may be associated with the exit opening 64 and may draw air
`from the constricted convection channel 50. In other embodi
`ments, the fan 52 may be associated with the entrance open
`ing 62 and may force air into the constricted convection
`channel 50. Other embodiments may utilize a combination of
`both drawing the air from the channel and forcing the air into
`the channel. In an exemplary embodiment, a plurality of fans
`would be distributed across the entire exit opening 64 (or
`entrance opening 62, or both) in order to produce a uniform
`flow of air across the posterior display surface to facilitate
`uniform cooling.
`In other exemplary embodiments, a means for cooling air
`in gas communication with the entrance opening 62 may be
`employed. The means for cooling the air may include, but is
`not limited to, a conditioning unit, a refrigerating unit, a
`thermoelectric unit, or any other device that decreases the
`temperature of the air. Cooling the air further increases the
`air's ability to transfer heat from the display posterior 22. The
`means for cooling air may be housed within the external
`housing 80, or it may be an external unit.
`FIG. 9 is a display 10 using and exemplary embodiment of
`the constricted convection cooling system, where three cool
`ing pathways are used. The first cooling pathway is comprised
`of the constricted convection plate 30 immediately behind the
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`US 8,854,595 B2
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`display posterior. The second cooling pathway is a closed
`loop and is comprised of the isolated gas cooling system 100.
`The third cooling pathway is comprised of the ambient air
`vent system used to cool the refrigeration unit 110. In some
`embodiments, the first and/or second pathways may include
`refrigerated air. In still other exemplary embodiments, the
`first and/or second