WO2007043221A9 - Dispositif d’affichage et dispositif d’eclairage - Google Patents

Dispositif d’affichage et dispositif d’eclairage

Info

Publication number
WO2007043221A9
WO2007043221A9 PCT/JP2006/313280 JP2006313280W WO2007043221A9 WO 2007043221 A9 WO2007043221 A9 WO 2007043221A9 JP 2006313280 W JP2006313280 W JP 2006313280W WO 2007043221 A9 WO2007043221 A9 WO 2007043221A9
Authority
WO
WIPO (PCT)
Prior art keywords
air
exhaust
flow rate
intake
housing
Prior art date
Application number
PCT/JP2006/313280
Other languages
English (en)
Japanese (ja)
Other versions
WO2007043221A1 (fr
Inventor
Daisuke Teragawa
Original Assignee
Sharp Kk
Daisuke Teragawa
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 Sharp Kk, Daisuke Teragawa filed Critical Sharp Kk
Publication of WO2007043221A1 publication Critical patent/WO2007043221A1/fr
Publication of WO2007043221A9 publication Critical patent/WO2007043221A9/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
    • F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133628—Illuminating devices with cooling means

Definitions

  • the present invention relates to a display device including a display panel and a lighting device inside a housing and the lighting device. More specifically, the temperature inside the housing of the display device and the lighting device is made uniform.
  • the present invention relates to a display device provided with an exhaust structure that does not cause the problem.
  • a liquid crystal display device including a liquid crystal display panel in which liquid crystal is sealed between a pair of transparent substrates is widely applied.
  • an illumination device is disposed on the back side of the liquid crystal display panel.
  • a discharge tube or a light emitting diode (hereinafter referred to as LED) is usually used as a light source.
  • a so-called lighting device called a direct type a plurality of light sources such as the discharge tubes and LEDs are uniformly distributed over the entire display area of the liquid crystal display panel. The characteristics of the light emitted from this light source are adjusted by an optical screen or the like and irradiated on the back side of the liquid crystal panel. The irradiated light passes through the liquid crystal display panel, whereby an image is displayed on the front of the liquid crystal display panel.
  • an air intake port is disposed below the housing and an air exhaust port is disposed above the housing.
  • the chimney effect causes air to flow upward and exhaust air. In this way, the total exhaust amount from the inside of the housing can be increased, and therefore the average temperature inside the housing can be lowered.
  • Japanese Patent Application Laid-Open No. 2001-332074 relates to an exhaust structure of a DVD-type liquid crystal television in which a digital 'Versatile Disk' (hereinafter referred to as a DVD) and a liquid crystal television are arranged in one casing. It is.
  • This DVD-type LCD TV is equipped with an exhaust port and an air intake port at the top and bottom of the casing, so that the hot air flows upward and the chimney effect passes through it.
  • the problem to be solved by the present invention is that air heated by a heat source such as a light source of a lighting device provided in the housing, a driving circuit thereof, a driving circuit of a display panel, and other electric circuits. Is exhausted while keeping the temperature inside the housing or lighting device uniform. It is to provide a display device.
  • a heat source such as a light source of a lighting device provided in the housing, a driving circuit thereof, a driving circuit of a display panel, and other electric circuits.
  • a display device includes a display panel and an illumination device having a light source, the display device including the light source and other electrical components inside the housing.
  • An exhaust part that exhausts air heated by a heat source of the circuit to the outside; and an intake part that sucks air outside the casing; and the exhaust part is disposed below the intake part, and the casing
  • the gist is that the internal air flows downward from above and is exhausted.
  • the illumination device is an illumination device having a light source, and an exhaust unit that exhausts the air heated by the light source inside the illumination device and a heat source of another electric circuit to the outside, And an exhaust part that inhales air outside the net device, the exhaust part is disposed below the intake part, and the air inside the illumination device flows downward and is exhausted. To do.
  • the exhaust part is provided with one or a plurality of openings provided in the lower part of the casing or the lower part of the lighting device, and the outside from the inside of the casing or the lighting device via the opening. It is preferable that the air intake section includes one or a plurality of openings provided in the upper part of the housing or the upper part of the illumination device.
  • temperature detection means are provided at the lower and upper portions of the casing or the lighting device, and the intake air flow rate adjusting means for adjusting the flow rate of air sucked from the intake portion and Z or exhausted from the exhaust portion.
  • the exhaust flow rate adjusting means for adjusting the air flow rate and the intake flow rate adjusting means and Z or the exhaust flow rate adjusting means are used to determine the exhaust flow rate and the Z or intake flow rate based on the difference between the detected temperatures detected by each temperature detecting means. It is effective to provide a feedback control unit that adjusts the temperature distribution inside the housing or the lighting device to be uniform.
  • Such a configuration can be suitably used for a display device including an illuminating device in which a plurality of discharge tubes are arranged in parallel as a light source.
  • a remarkable effect is obtained in a display device in which these discharge tubes are arranged in a vertical direction.
  • the temperature difference between the upper part of the casing and the lower part of the casing is controlled.
  • the exhaust flow rate and intake flow rate can be adjusted automatically according to the above. Therefore, it is possible to automatically respond to the lighting device lighting state, the amount of heat generated in the electric circuit, the temperature of the outside air sucked into the housing, etc.
  • the temperature difference can be kept small.
  • the lighting device is provided with the display device. Even if the light source has a plurality of discharge tubes arranged in parallel, the light emission characteristics of the discharge tubes do not vary. Therefore, uniform light emission can be obtained within the display surface, and uneven brightness does not occur.
  • the discharge tube can be lit stably.
  • the lighting device includes the exhaust portion and the intake portion, and the exhaust portion is disposed below the intake portion, the air flowing from above to below inside the lighting device. Can be generated. As a result, it is possible to prevent the hotter air inside the lighting device from being biased toward the upper part of the lighting device.
  • the air outside the lighting device is also sucked into the intake unit force, the heated air inside the lighting device and the relatively cool air sucked from outside the lighting device are mixed in the upper part of the lighting device. . Therefore, the temperature inside the lighting device can be effectively reduced. As a result, while the temperature inside the lighting device is kept uniform, the exhaust air can be exhausted to dissipate the heat inside the lighting device.
  • FIG. 1 is a diagram schematically showing a back surface of a liquid crystal display device according to a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the liquid crystal display device shown in FIG.
  • FIG. 3 is a diagram schematically showing a back surface of a liquid crystal display device according to a second embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of the liquid crystal display device shown in FIG.
  • FIG. 5 is a block diagram showing an outline of feedback control for making the temperature inside the casing of the liquid crystal display device shown in FIG. 4 uniform.
  • FIG. 6 is a diagram schematically showing a cross section of a lighting apparatus according to a third embodiment of the present invention.
  • FIG. 1 and 2 are diagrams schematically showing a liquid crystal display device according to a first embodiment of the present invention, FIG. 1 is a perspective view from the back, and FIG. 2 is a cross-sectional view. .
  • a liquid crystal display device 100 shown in FIGS. 1 and 2 includes a liquid crystal module 30 including a display panel 10 and a lighting device 20 in a housing 40.
  • Display panel 10 has two glass substrates 12 and 12 are bonded together, and liquid crystal 14 is sealed between them. This display panel 10 is connected to a display panel drive circuit (not shown) for controlling the display state.
  • the illumination device 20 includes an optical sheet 22, a plurality of discharge tubes 24, an inverter circuit board (not shown) for driving these discharge tubes, a reflector 26, and the like.
  • the optical sheets 22 are for adjusting the characteristics of light incident on the display panel 10 from the discharge tube 24, and include, for example, a diffusion sheet, a lens sheet, a polarization reflection sheet, a diffusion plate, and the like.
  • Each discharge tube 24 is arranged vertically and connected to an inverter circuit. These discharge tubes 24 are installed in parallel in the horizontal direction.
  • the illuminating device 20 including the plurality of discharge tubes 24 is illustrated, but an illuminating device using other light sources may be used.
  • an illumination device in which a plurality of light emitting diodes or the like are arranged may be used.
  • any lighting device having a light source having a temperature-dependent light emission characteristic may be used.
  • Openings 44m and 46m are provided on the rear surface of the casing 40.
  • Filter openings 44f and 46f are provided in the openings 44m and 46m so as to prevent external dust and the like from entering the casing.
  • an exhaust fan 42 is provided at the lower portion of the housing 40 so that the force of the opening 44m also exhausts the air inside the housing 40.
  • the exhaust portion 44 is composed of the opening 44m having the filter member 44f and the exhaust fan 42, and the opening portion 46f having the filter member 46f is also composed of the intake portion 46.
  • the lighting device 20 When the liquid crystal display device 100 is turned on, the lighting device 20 is driven via the inverter circuit, and the light emitted from the discharge tube 24 passes through the reflector 26 and the optical sheets 22 to display the display panel. 10 is irradiated.
  • the display panel drive circuit controls the transmittance of the display panel 10.
  • the discharge tube 24 When the discharge tube 24 is thus lit and an electric circuit such as a drive circuit or an inverter circuit is operated, the discharge tube 24 and various electric circuits generate heat, and the air in the housing 40 is heated. In this way, when air is heated in a closed space, hot air is The air with a relatively low temperature tends to be biased downward.
  • FIG. 3 and 4 are diagrams schematically showing a liquid crystal display device according to a second embodiment of the present invention, FIG. 3 is a perspective view from the back, and FIG. 4 is a cross-sectional view. .
  • a liquid crystal display device 200 shown in FIGS. 3 and 4 includes a liquid crystal module 30 including a display panel 10 and a lighting device 20 that are the same as the liquid crystal display device 100 according to the first embodiment of the present invention. Within 40.
  • the illumination device 20 includes an optical sheet 22, a plurality of discharge tubes 24, an inverter circuit board (not shown) that drives these discharge tubes, a reflector 26, and the like.
  • Each discharge tube 24 is arranged horizontally and connected to an inverter circuit. These discharge tubes 24 are installed in parallel in the vertical direction.
  • Openings 44m and 46m are provided on the rear surface of the casing 40. Filter members 44f and 46f are attached to the openings 44m and 46m.
  • An intake fan 48 is attached to the upper portion of the housing 40 so that the opening 46 m force also sucks air into the housing 40. Further, an exhaust fan 42 is provided at the lower portion of the housing 40 so as to exhaust the air inside the housing 40 with an opening 44 m force.
  • the exhaust part 44 is composed of the opening 44 having the filter member 44f and the exhaust fan 42
  • the intake part 46 is composed of the opening 46m having the filter member 46f and the intake fan 48. Yes.
  • the exhaust fan 42 and the intake fan 48 are turned on, outside air is sucked into the housing 40 from the suction portion 46 and air inside the housing 40 is exhausted from the exhaust portion 44. As a result, an air flow as indicated by the arrow 50 can be generated inside the housing 40.
  • the discharge tube 24 When the liquid crystal display device 200 is turned on, the discharge tube 24 is turned on, and an electric circuit such as a drive circuit or an inverter circuit of the display panel 10 is activated. Along with this, the discharge tube 24 and various electric circuits generate heat, and the air in the housing 40 is heated. Thus, when air is heated in a closed space, high-temperature air tends to be biased upward, and relatively low-temperature air tends to be biased downward.
  • the temperature inside the casing 40 is made uniform, the temperature becomes uniform among the plurality of discharge tubes 24 arranged side by side. As a result, the temperature difference between the plurality of discharge tubes 24 is eliminated, and the light emission characteristics do not vary. Accordingly, uniform light emission can be obtained over the entire display area.
  • the intake flow rate FL from the intake unit 46 and the exhaust flow rate FL from the exhaust unit 42 are expressed as follows.
  • the intake flow rate FL and the exhaust flow rate FL can be adjusted according to the temperature difference between the upper part and the lower part in the housing 40.
  • an upper temperature detecting means 52T for detecting the temperature T in the upper part of the housing 40 and a lower temperature detecting means 52T for detecting the temperature T in the lower part of the housing 40 are arranged.
  • the lower and lower temperature detecting means 52T, 52T are not particularly limited, such as a thermocouple or thermistor.
  • examples of the intake flow rate adjusting means and the exhaust flow rate adjusting means include the following.
  • the openings 44m and 46m are configured to be openable and closable, and when the flow rate is reduced, the openings 44m and 46m are partially or entirely closed to reduce the area thereof.
  • a blower fan capable of adjusting the air volume is applied to the exhaust fan 42 and the intake fan 48.
  • FIG. 5 shows the intake flow rate FL and the flow rate based on the difference between the temperature T at the top of the housing 40 and the temperature T at the bottom.
  • the temperature is automatically maintained in a more ideal state. For example, when the outside air of the housing 40 is extremely cold, the temperature of the upper portion of the housing 40 does not drop too much due to excessive intake of outside air from the air intake 46.
  • FIG. 6 is a cross-sectional view schematically showing a lighting apparatus according to the third embodiment of the present invention.
  • the lighting device 20 shown in FIG. 6 is disposed on the back surface of the display panel 10.
  • the display panel 10 and the lighting device 20 constitute a liquid crystal module 30.
  • the display panel 10 is obtained by bonding two glass substrates 12 and 12 and enclosing a liquid crystal 14 therebetween.
  • the display panel 10 includes a display panel drive circuit (not shown) for controlling the display state. The road is connected.
  • the illumination device 20 includes an optical sheet 22, a plurality of discharge tubes 24, an inverter circuit board (not shown) that drives these discharge tubes, and a reflector 26.
  • the optical sheets 22 are for adjusting the characteristics of light incident on the display panel 10 from the discharge tube 24, and include, for example, a diffusion sheet, a lens sheet, a polarization reflection sheet, and a diffusion plate.
  • Each discharge tube 24 is arranged vertically and connected to an inverter circuit. These discharge tubes 24 are installed in parallel in the horizontal direction.
  • the reflector plate 24 is provided with openings 44m and 46m.
  • Filter openings 44f and 46f are provided in the openings 44m and 46m so that dust or the like does not enter from the outside of the lighting device 20.
  • an exhaust fan 42 is provided at the lower part of the reflector 24 so that the force of the opening 44m also exhausts the air inside the liquid crystal module 30.
  • the exhaust part 44 is composed of the opening 44m having the filter member 44f and the exhaust fan 42
  • the intake part 46 is composed of the opening 46f having the filter member 46f.
  • the reflector 26 reflects the light emitted from the discharge tube 24 to the display panel 10 side. Therefore, it is desirable that the openings 44m and 46m provided in these are provided so as not to disturb the reflection of light to the display panel 10.
  • the temperature inside the lighting device 20 is made uniform.
  • the temperature distribution hardly occurs in the axial direction of the discharge tube 24. Therefore, it is difficult to cause a problem that the discharge tube 24 does not light up without fear of aggregation of mercury in the discharge 24 tube.
  • the lighting device 20 as described above it is possible to generate an airflow flowing from the upper side to the lower side in the lighting device, and to directly equalize the temperature in the lighting device, which is more effective. It is.
  • the present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the spirit of the present invention.
  • the structure of the exhaust part / intake part and the configuration of feedback control shown as examples of the display device can be applied to the lighting device.
  • the position and shape of the exhaust part or the intake part, which can use an LED as a light source are not limited to the above-described embodiment, and the main point is that air is allowed to flow downward in the casing.
  • the exhaust part only needs to be provided below the intake part.
  • the heated air can be exhausted while keeping the temperature inside the casing uniform, and the light emission characteristics of the plurality of light sources provided in the illumination device vary. Therefore, it is suitable for a liquid crystal display device or the like that requires uniform light emission within the display surface.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Projection Apparatus (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

L’invention concerne un dispositif d’affichage dont la zone d’affichage présente une luminosité uniforme du fait de la température uniforme dans son boîtier et des caractéristiques d’émission de lumière uniformes de ses sources de lumière. Le dispositif d’affichage (100) comprend un panneau d’affichage et un dispositif d’éclairage (20) comportant des sources de lumière (24) disposées dans un boîtier (40). Le dispositif d’affichage (100) comprend en outre une partie d’évacuation d’air (44) servant à évacuer vers l’extérieur l’air présent dans le boîtier (40) chauffé par les sources de lumière (24) et par des sources de chaleur d’autres circuits électriques, et une partie d’aspiration d’air (46) servant à aspirer de l’air de l’extérieur du boîtier. La partie d’évacuation d’air (44) est placée en dessous de la partie d’aspiration d’air (46), et l’air présent dans le boîtier (40) est évacué en s’écoulant du dessus vers le bas en uniformisant ainsi la température dans le boîtier (40).
PCT/JP2006/313280 2005-09-30 2006-07-04 Dispositif d’affichage et dispositif d’eclairage WO2007043221A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-286805 2005-09-30
JP2005286805 2005-09-30

Publications (2)

Publication Number Publication Date
WO2007043221A1 WO2007043221A1 (fr) 2007-04-19
WO2007043221A9 true WO2007043221A9 (fr) 2007-06-14

Family

ID=37942483

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/313280 WO2007043221A1 (fr) 2005-09-30 2006-07-04 Dispositif d’affichage et dispositif d’eclairage

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Country Link
WO (1) WO2007043221A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4844698B1 (ja) * 2011-07-11 2011-12-28 パナソニック株式会社 照明装置及び照明装置用送風ユニット
JP4900531B1 (ja) * 2011-10-07 2012-03-21 パナソニック株式会社 照明装置及び照明装置用送風ユニット

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3027839B2 (ja) * 1991-02-27 2000-04-04 カシオ計算機株式会社 液晶プロジェクタ
JPH07335015A (ja) * 1994-06-10 1995-12-22 Hitachi Ltd 表示装置
JP3919984B2 (ja) * 1999-09-30 2007-05-30 富士フイルム株式会社 偏光板の製造方法
WO2002056110A1 (fr) * 2001-01-15 2002-07-18 Seiko Epson Corporation Projecteur
JP2005195623A (ja) * 2003-12-26 2005-07-21 Fujitsu Display Technologies Corp 液晶表示装置

Also Published As

Publication number Publication date
WO2007043221A1 (fr) 2007-04-19

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