GB2402205A - A display system cabinet and display system including heat removal means - Google Patents

A display system cabinet and display system including heat removal means Download PDF

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Publication number
GB2402205A
GB2402205A GB0311575A GB0311575A GB2402205A GB 2402205 A GB2402205 A GB 2402205A GB 0311575 A GB0311575 A GB 0311575A GB 0311575 A GB0311575 A GB 0311575A GB 2402205 A GB2402205 A GB 2402205A
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GB
United Kingdom
Prior art keywords
display
air
zone
heat
transfer means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB0311575A
Other versions
GB0311575D0 (en
Inventor
Leslie John Yare
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Densitron Technologies Ltd
Original Assignee
Densitron Technologies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Densitron Technologies Ltd filed Critical Densitron Technologies Ltd
Priority to GB0311575A priority Critical patent/GB2402205A/en
Publication of GB0311575D0 publication Critical patent/GB0311575D0/en
Publication of GB2402205A publication Critical patent/GB2402205A/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
    • H05K7/20972—Forced ventilation, e.g. on heat dissipaters coupled to components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D9/0025—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being formed by zig-zag bend plates
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • G02F1/133385—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell with cooling means, e.g. fans
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Nonlinear Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

A display cabinet 10 has a sealed airtight compartment 30 for mounting a display system 20, and includes heat transfer means 70, such as a corrugated heat exchanger, to dissipate heat from the airtight compartment to the surrounding environment via thermal communication with an unsealed atmospheric zone 40. Heat is dissipated by air drawn through vents 60 and the atmospheric air zone 40 by at least one fan 50, which passes across one or more surfaces of the heat exchanger 70. Within the sealed compartment at least one fan 25 circulates air through a rear portion 35, behind a baffle plate 90 and also across the heat exchanger 70. The airtight compartment may include a pressurised zone 85 created by at least one fan 80, and the heat transfer means may alternatively include a heat pipe, a refrigeration unit, a flat plate heat exchanger, or a heat wheel. The display system may include one or more of a plasma display, an LCD display, a TFT display, a CRT display, an LED display, a projection display.

Description

Display System Cabinet and Display S
Field of the Invention
The present invention relates to a cabinet for mounting a display system, the cabinet having improved cooling facilities and which is particularly suitable for use in providing large scale displays in public places.
Background to the Invention
Large scale electronic image and/or video display systems are used in many places, for example, to provide public information or display advertising materials. Such displays must have a size and resolution sufficient for information can be viewed from a distance.
In order to provide large display screens, plasma, LCD or rear projection technologies are commonly used. However, such screens can generate a lot of heat and it is therefore essential for them to have an efficient cooling system to remove the heat from the display in order for it to function normally.
Unfortunately, in many public places where there is a large quantity of human or vehicle traffic the cooling system can become clogged with dust, dirt and general pollution. In this situation, the cooling system becomes inefficient and may compromise the functionality of the display by causing it to overheat, resulting in temporary or permanent failure of the display system.
In order to address this problem, many display systems use filters at the interface between the cooling system and the external environment. However, filters eventually become clogged and inefficient and compromise the system and therefore require monitoring and/or changing regularly. Where the display system is mounted in an inaccessible location, as is often the case for such systems, this maintenance is particularly troublesome and is of annoyance to operators.
Summary of the Invention
According to one aspect of the present invention, there is provided a display cabinet comprising a substantially atmospherically sealed zone including means for mounting
J
a display system in the substantially atmospherically sealed zone and heat transfer means arranged to transfer heat out of the substantially atmospherically sealed zone.
The present invention seeks to provide a sealed display system having a cooling system that is substantially unaffected by pollution, dust or dirt in the atmosphere.
In a preferred embodiment, a zone of the cabinet containing the display system is sealed to the external environment. The sealed zone includes an internal cooling system that is not open to atmospheric air. Atmospheric air is drawn into a separate zone that allows heat to be exchanged between the two zones. Heat is then removed by expulsion of heated atmospheric air from the casing.
Advantageously, the lifetime of a display is increased due to elimination of ingress of dirt and the like into the display. In addition, the cooling system of the present invention is arranged to co-operate with existing internal cooling systems of the display to improve the effectiveness of the display's cooling system.
The display cabinet may further comprise an atmospheric zone, the heat transfer means being arranged to communicate heat from the substantially atmospherically sealed zone to the atmospheric zone.
The atmospheric zone may include air transfer means arranged to draw air from outside the cabinet and expel air in the atmospheric zone heated by the heat transfer means.
The air transfer means may include one or more fans.
The heat transfer means may comprise a heat exchanger.
The heat exchanger may comprise a corrugated heat conducting sheet having a first side in the substantially atmospherically sealed zone and a second side in the atmospheric zone.
The substantially atmospherically sealed zone may include air circulation means arranged to circulate air along the heat transfer means.
The air circulation means may include a baffle plate.
The substantially atmospherically sealed zone may include air pressurization means arranged to project air within the atmospherically sealed zone into circulate air along the mounted display.
The air pressurization means may include one or more fans.
The heat transfer means may include one or more of: a refrigeration unit, heat pipes, flat plates and a heat wheel, although it will be apparent that the heat transfer means may include other systems or methods.
The display cabinet may include a display system such as a plasma display, an LCD, a TFT display, a CRT display, a LED display, a projector or a rear projection display.
It will be appreciated that any display could be used and the cabinet could also be adapted to cater for new technologies as and when necessary.
Brief Description of the Drawings
An example of the present invention will now be described in detail, by way of example only, with reference to the accompanying drawings in which: Figure 1 is a cross section of a display system according to an embodiment of the present invention; Figure 2, 3 and 4 are show parts of the cross section of Figure 1 in more detail; Figure S is a perspective view of part of a heat exchanger suitable for use in the present invention; and, Figure 6 is a cross section of part of the embodiment of Figure I along a line substantially perpendicular to the cross-section of Figure 1.
Detailed Description
Figure 1 is a cross section of a display system according to an embodiment ofthe present invention.
A cabinet 10 is arranged to contain a display 20 for displaying information, advertisements or other visual media. The display is sealed within the cabinet in a sealed zone 30. In operation, the components of the display 20 create heat inside the display 20 in the sealed zone 30. Vents and other venting means (not shown) allow air to travel through a rear portion 35 of the display 20, although the air is sealed within the sealed zone 30.
The cabinet 10 also includes an atmospheric air zone 40. Air from the outside of the cabinet 10 is drawn through vents 60 into the atmospheric air zone 40 by fans 50. The fans 50 draw the air up through the atmospheric air zone 40. The air is then expelled from the cabinet 10 through the fans 50. Arrows in figures 2 and 3 show the passage of air through the vents 60 into the atmospheric air zone 40 and out through the fans 50, respectively.
The cabinet 10 includes a heat exchanger 70 mounted on a baffle plate 90. Also mounted on the baffle plate 90 are fans 80. The sealed zone 30 and atmospheric air zone 40 are sealed from each other to prevent the passage of air, dirt and the like. The heat exchanger 70 is arranged to communicate heat between the sealed zone 30 ad the atmospheric zone 40.
Arrows in Figure 4 illustrate the movement of air in both the atmospheric air zone 40 and in the sealed zone 30 of the cabinet]0 in more detail. Dotted arrows show movement of air in the atmospheric air zone 40 whilst solid arrows show movement of air in the sealed zone 30.
Air is drawn through the atmospheric air zone 40 by fans 50. As the air is drawn through the atmospheric air zone 40 it passes across one or more surfaces of the heat exchanger 70. Similarly, air within the sealed zone 30 is drawn into the heat exchanger 70 behind the baffle plate 90 by the fans 80 at point A and passes across one or more other surfaces of the heat exchanger 70.
Air is circulated within the sealed zone 30 due to operation of the fans 80 within the cabinet and fans 25 within the display 20. Air coming into contact with hot components of the display 20 absorbs some of the heat. Due to operation of the fans 25 and 80 and orientation of the baffle plate 90, air within the sealed zone 30 is directed along one or more surfaces of the heat exchanger 70 around the baffle plate 90. Heat is transferred by the heat exchanger 70 from hot air in the sealed zone 30 to cooler atmospheric air within the atmospheric air zone 40. Heated air in the atmospheric air zone 40 is eventually ejected from the cabinet via exhausts in the fans 50.
The cooled air in the sealed zone is then forced through the fans 80 at the base of the heat exchanger 70 into a pressure zone 85.
As air is forced into the pressure zone 85, existing air in the pressure zone 85 is forced through vents in the rear portion 35 of the display 20. The air circulates around the display 20, aided by a standard internal cooling system of the display 20. In the illustrated embodiment, the internal cooling system includes the fans 25. The air is heated by hot components as it circulates, and is drawn upwards by the fans 25 within the display unit and blown out of the rear portion 35 for the cycle to continue.
The pressure zone 85 is created by forcing air into the zone using a bank of fans 80 at the base of the baffle plate 90. Due to the speed and number of the fans air is forced into the pressure zone more rapidly than it can escape elsewhere. In this manner, air is forced into the display 20 at a greater rate than is normally the case, thereby improving the efficiency of the display's own fans. As a result, more air passes through taking more heat away with it as it goes.
The baffle plate 90 on the side of the sealed zone 30 divides air expelled from the rear portion 35 of the display 20 and ensures air flows properly in the desired direction, along the heat exchanger towards the fans 80, allowing the pressure to be increased on one side of it.
In this manner, the sealed zone 30 is cooled without the ingress of atmospheric air.
Figure 5 is a perspective view of part of a heat exchanger suitable for use in the present invention.
In the illustrated embodiment of the present invention, the heat exchanger 70 is formed from corrugated metal, thereby increasing the surface area in contact with both the atmospheric air zone 40 and the sealed zone 30. The heat exchanger is sealed at the top and the bottom on the inner side to prevent atmospheric air I 10 and the re- circulating air 100 within the sealed zone from mixing.
It will be apparent that other heat exchange arrangements or mechanisms could be used depending on the expected environment the product would be placed in. For example, the heat exchanger 70 could be: a refrigeration unit, heat pipes, flat plates, a heat wheel or one of the many other heat exchangers known.
The cooling process need not be in the form of air to air transfer of heat. For example, cooling could be via atmospheric air to another gas sealed within the sealed zone 30, air to a liquid (or air to liquid within heat pipes or the dike to air), gas to a liquid, liquid to liquid etc. The fans 80 are mounted to the baffle plate 90 which is in turn mounted to the heat exchanger 70. This assembly is then mounted within the cabinet 10 whilst allowing appropriate passage of air within the sealed zone 30 behind the baffle plate 90 into contact with the heat exchanger 70.
Figure 6 is a cross section of part of the embodiment of Figure 1 along a line substantially perpendicular to the cross-section of Figure 1.
Various forms of display system may be used, for example plasma, LCD, TFT, CRT, LED, rear projection or any similar technology.
The sealed zone may be created by use of gaskets formed from silicon, rubber, foam or the like.
The above-described embodiment significantly reduces the possibility of operational failure by removal of ingress of dirt and the like from the display system 20. In order to maintain full cooling effectiveness, intermittent cleaning of the vents 60 and fans along with infrequent cleaning of the heat exchanger in the atmospheric zone 40 is suggested. Due to the design and configuration of the cabinet and components, it will be appreciated that these areas are much easier to clean than in prior systems facilitating reduced downtime and maintenance costs. Furthermore, separation of the display system 20 from dirt and the like results in a longer life for the display system and a more efficient heat transfer.
Thermal fuses may be provided in the atmospheric zone and in the sealed zone to disable the display system (and possibly fans) in the event that a predetermined temperature (for example 40 C) indicative of an air blockage in atmospheric zone, failure of the heat exchanger, fan failure, a fire or the like. Advantageously, since air within the sealed zone is limited, should a fire occur in the sealed zone, any smoke created would be contained and the fire should burn out very quickly due to lack of oxygen. Obviously if it is desired, the air within the sealed zone can be replenished or refreshed by opening and then resealing the sealed zone.
The fans 80 in the sealed zone are preferably temperature controlled and operate independently of the rest of the system.

Claims (15)

  1. Claims 1. A display cabinet comprising a substantially atmospherically
    sealed zone including means for mounting a display system in the substantially atmospherically sealed zone and heat transfer means arranged to transfer heat out of the substantially atmospherically sealed zone.
  2. 2. A display cabinet according to claim 1, further comprising an atmospheric zone, the heat transfer means being arranged to communicate heat from the substantially atmospherically sealed zone to the atmospheric zone.
  3. 3. A display cabinet according to claim 2, wherein the atmospheric zone includes air transfer means arranged to draw air from outside the cabinet and expel air in the atmospheric zone heated by the heat transfer means.
  4. 4. A display cabinet according to claim 3, wherein the air transfer means includes one or more fans.
  5. 5. A display cabinet according to any preceding claim, wherein the heat transfer means comprises a heat exchanger.
  6. 6. A display cabinet according to claim 5, wherein the heat exchanger comprises a corrugated heat conducting sheet having a first side in the substantially atmospherically sealed zone and a second side in the atmospheric zone.
  7. 7. A display cabinet according to any preceding claim, wherein the substantially atmospherically sealed zone includes air circulation means arranged to circulate air along the heat transfer means.
  8. 8. A display cabinet according to claim 7, wherein the air circulation means includes a baffle plate.
  9. 9. A display cabinet according to any preceding claim, wherein the substantially atmospherically sealed zone includes air pressurization means arranged to project air within the atmospherically sealed zone into circulate air along the mounted display.
  10. 10. A display cabinet according to claim 9, wherein the air pressurization means includes one or more fans.
  11. 11. A display cabinet according to any one of claims l to 5, wherein the heat transfer means includes one or more of: a refrigeration unit, heat pipes, flat plates and a heat wheel.
  12. 12. A display cabinet as claimed in any one of the preceding claims including a display system.
  13. 13. A display cabinet as claimed in claim 12, wherein the display system includes one or more of: a plasma display, an LCD, a TFT display, a CRT display, a LED display, a projector and a rear projection display.
  14. 14. A display cabinet as herein described and with reference to the accompanying drawings.
  15. 15. A display system as herein described and with reference to the accompanying drawings.
GB0311575A 2003-05-20 2003-05-20 A display system cabinet and display system including heat removal means Withdrawn GB2402205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0311575A GB2402205A (en) 2003-05-20 2003-05-20 A display system cabinet and display system including heat removal means

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0311575A GB2402205A (en) 2003-05-20 2003-05-20 A display system cabinet and display system including heat removal means

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GB0311575D0 GB0311575D0 (en) 2003-06-25
GB2402205A true GB2402205A (en) 2004-12-01

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EP1684562A2 (en) * 2005-01-25 2006-07-26 Gerätebau Felix Schulte GmbH & Co. KG Device to cool multifunctional system-consoles
NL1029516C2 (en) * 2005-07-14 2007-01-16 Tvskin V O F Device is for at least partly screening a television set which is relatively flat against undesirable impairment or outright damage comprises a one-sidedly opened surrounding structure with coupling components for its suspension on a wall
FR2891940A1 (en) * 2005-10-06 2007-04-13 Cotep Sa Information and still or movable image e.g. advertising image, display system for e.g. bus station, has case including fresh air inlet and hot air outlet for freely circulating cooling air outside sealed covers which are formed of aluminum
WO2008085138A1 (en) * 2007-01-10 2008-07-17 Leopold Pungercar Outdoor display
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EP2606396A2 (en) * 2010-08-20 2013-06-26 Manufacturing Resources International, INC. System and method for thermally controlling an electronic display with reduced noise emissions
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Cited By (118)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1684562A2 (en) * 2005-01-25 2006-07-26 Gerätebau Felix Schulte GmbH & Co. KG Device to cool multifunctional system-consoles
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