WO2003056236A1 - Unite d'eclairage et dispositif d'affichage a cristaux liquides utilisant cette unite - Google Patents
Unite d'eclairage et dispositif d'affichage a cristaux liquides utilisant cette unite Download PDFInfo
- Publication number
- WO2003056236A1 WO2003056236A1 PCT/JP2002/013492 JP0213492W WO03056236A1 WO 2003056236 A1 WO2003056236 A1 WO 2003056236A1 JP 0213492 W JP0213492 W JP 0213492W WO 03056236 A1 WO03056236 A1 WO 03056236A1
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- Prior art keywords
- light
- lighting
- housing
- liquid crystal
- lighting unit
- Prior art date
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Classifications
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- 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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0093—Means for protecting the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0055—Reflecting element, sheet or layer
-
- 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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133311—Environmental protection, e.g. against dust or humidity
-
- 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
-
- 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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133512—Light shielding layers, e.g. black matrix
-
- 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 lighting unit in which a light source is arranged on an end face of a light guide plate and a liquid crystal display device using the same.
- liquid crystal display devices are increasingly used. Many of these liquid crystal display devices adopt a configuration in which a built-in illumination unit illuminates illumination light from behind a display panel in order to realize a bright display screen.
- an edge-light system in which a light guide plate is placed on the back surface of a display panel and a line light source such as a fluorescent discharge tube is arranged on the end surface of the light guide plate is characterized in that it is thin and has excellent brightness uniformity on a light emitting surface. Therefore, it is often adopted as a backlight system for liquid crystal display devices used in notebook personal computers and the like.
- FIG. 6 shows a conventional edge light type illumination unit UT provided with a fluorescent discharge tube
- FIG. 7 shows a liquid crystal display device LD having the illumination unit UT shown in FIG.
- the lighting unit UT includes a flat transparent light guide plate 1 for transmitting light, a fluorescent discharge tube 2 arranged on two opposing sides of the four sides of the light guide plate 1, and a fluorescent discharge tube 2. By reflecting the light emitted from And a reflection sheet 3 for guiding to the end face D1 of the light guide plate 1.
- the end face D 1 of the light guide plate 1 is an end face on which the fluorescent discharge tube 2 is provided
- the end face D 2 is an end face on which the fluorescent discharge tube 2 is not provided.
- the back surface and the end surfaces Dl and D2 of the light guide plate 1 are covered with the reflection sheet 3 including the fluorescent discharge tube 2 to form an illumination element 10.
- the lighting element 10 is held from above and from the side by the frame member 9, and is held from below by the box-shaped back cover 8 fitted to the frame member 9. It is housed in a housing 30 composed of the member 9 and the back surface force par 8. Then, light correction sheets 4 and 5 are provided on the light exit surface side of the light guide plate 1.
- the lighting unit UT is formed as described above. Further, a liquid crystal panel 11 and a front cover 12 are mounted on the light emitting surface side of the lighting unit UT. Thereby, the liquid crystal display device LD is formed.
- the reflection sheet 3 reflects the light leaking from the light guide plate 1 to the outside of the unit and returns the light into the light guide plate 1 again, and plays a role of increasing the illumination light emitted from the light emission surface.
- a white resin film having high reflectance is used as the reflection sheet 3.
- the reflection sheet 3 may be provided with a printing pattern (not shown) so that the diffusion area of the light increases as the distance from the fluorescent discharge tube 2 as the light source increases.
- the reflection sheet 3 is cut into a predetermined shape so as to cover the back surface and the end surfaces D 1 and D 2 of the light guide plate 1 and the fluorescent discharge tube 2, and is bent along each of the surfaces. Perforations S are provided at specified locations where possible.
- a portion around the fluorescent discharge tube 2 (hereinafter, this portion is referred to as a reflector portion 20) and a back surface of the light guide plate 1 are continuously covered with one reflective sheet 3.
- the reflection sheet 3 that covers the reflector portion 20 and the reflection sheet 3 that covers the back surface of the light guide plate 1 are separated, and the reflection sheet 3 may be configured so that both are adhered with double-sided tape.
- the lighting unit UT when an integrated reflecting sheet 3 that continuously covers the reflector section 20 and the back surface of the light guide plate 1 is used, the lighting unit UT can be made thinner, and the cost and assembly can be reduced. There is an advantage that the number of standing steps can be reduced.
- a diffusion sheet, a prism sheet, or the like is used as the light correction sheets 4 and 5.
- the light emitted from the light guide plate 1 is diffused and condensed, and the emitted light is equalized and the brightness is increased. Aim.
- Both ends of the fluorescent discharge tube 2 are connected by soldering or the like to lead wires (not shown) connected to a power supply unit (not shown) such as an impeller for generating a high-frequency AC.
- a voltage required for lighting the fluorescent discharge tube 2 is applied from the power supply unit through a lead wire.
- a high voltage is required to light the fluorescent discharge tube 2.
- a rubber holder 7 made of an insulator such as rubber is used to hold the fluorescent discharge tube 2 and the lead. It is attached to the outer circumference of the wire.
- the back cover 18 is fitted with the frame member 9 so as to form the housing 30 that houses the lighting element 10.
- a gap 16A exists between the back cover 8 and the frame member 9 fitted to each other.
- a gap 16 B exists between the back cover 8 and the lighting element 10.
- dust that has entered the inside of the device through the heat radiation holes 15 provided in the back cover 8 also removes the gap 16 B, the frame member 9 and the lighting element.
- the display area 25 Through the gap between the first and second elements 10. If dust enters the display area, the output light is blocked, causing uneven brightness. Further, the members in the display area 25 such as the light correction sheets 4 and 5 are damaged by friction with dust.
- the present invention has been made in view of the problems of the related art, and has an object to provide a liquid crystal display device capable of reliably preventing dust from entering a display area and a lighting unit used in the device.
- the purpose is to provide.
- an illumination unit comprises: a light source; a light guide plate that is disposed on an end face of the light source, guides light emitted from the light source, and emits light from a light emission surface;
- a shielding member that prevents dust from entering the lighting element through a gap between the lighting element and the end face of the lighting element is disposed between the housing and the lighting element.
- the housing has a frame portion that holds the lighting element from the light emitting surface side and the end surface side, and a back surface holding portion that holds the lighting element from the back surface side, and heats the heat inside the unit.
- a heat radiating hole for emitting the light to the outside may be formed in the back surface holding portion, and the shielding member may be disposed at least between a bottom surface of the lighting element and a bottom portion of the housing.
- the shielding member is provided between the back surface holding portion of the housing and the lighting element, dust entering the inside of the housing from the heat radiating hole is exposed to the light emitting surface of the lighting element.
- the casing which can prevent the intrusion of the lighting element c , constitutes the frame part, constitutes a frame member attached to the light emitting surface side of the lighting element, and constitutes the back surface holding part.
- a back surface holding member that fits with the frame member and accommodates the lighting element; a gap formed between the frame member of the housing and the back surface holding member is shielded by the shielding member; Well ,.
- the shielding member may have a flat plate shape, and an outer periphery of the shielding member may be located between an inner peripheral surface and an outer peripheral surface of the frame member of the housing. Further, the shielding member may have a box shape, and an outer periphery of the shielding member may be located between an inner peripheral surface and an outer peripheral surface of the frame member of the housing.
- the gap formed between the frame member forming the housing and the back surface holding member is shielded by the shielding plate member to be isolated from the lighting element, and formed on the back surface holding member.
- the heat radiating hole is shielded by the main surface of the shielding member and is isolated from the lighting element.
- the shielding member is made of a material having higher thermal conductivity than air. . According to this configuration, since the shielding member made of a material having a higher thermal conductivity than air is provided between the back surface holding portion of the housing and the lighting element, the back surface holding portion is provided. It is possible to radiate heat to the outside of the unit more efficiently from the heat radiating hole than when there is a gap between the lighting element and the lighting element. Therefore, various problems caused by heat can be suppressed, and a highly reliable lighting unit can be realized.
- a liquid crystal display device includes an illumination unit having the above-described configuration, and a liquid crystal panel disposed on the light exit surface side of the illumination unit.
- the above-described effect is obtained in the lighting unit, so that it is possible to prevent dust from entering the display area. Accordingly, luminance unevenness due to intrusion of dust can be eliminated, and the constituent members of the display area can be prevented from being damaged by the dust. In addition, since the device does not need to be disassembled to remove dust that has entered the display area, maintenance is facilitated.
- the lighting unit includes the shielding unit, which is made of a material having a higher thermal conductivity than air as described above, and is disposed between the lighting element and the back surface holding member of the housing. You may.
- FIG. 1 is a cross-sectional view schematically showing a configuration of a lighting unit according to Embodiment 1 of the present invention.
- Fig. 2 shows the structure of a liquid crystal display device incorporating the lighting unit of Fig. 1. It is sectional drawing which shows typically.
- FIG. 3 is a cross-sectional view schematically showing a configuration of a lighting unit according to Embodiment 2 of the present invention.
- FIG. 4 is a cross-sectional view schematically showing a configuration of a lighting unit according to Embodiment 3 of the present invention.
- FIG. 5 is a schematic development view illustrating the configuration of a reflection sheet used in the lighting unit.
- FIG. 6 is a cross-sectional view schematically showing a configuration of a conventional lighting unit.
- FIG. 7 is a cross-sectional view schematically showing a configuration of a liquid crystal display device incorporating the illumination unit of FIG.
- FIG. 1 is a cross-sectional view schematically showing a configuration of a lighting unit according to Embodiment 1 of the present invention.
- FIG. 2 is a sectional view of a liquid crystal display device incorporating the lighting unit shown in FIG. It is sectional drawing which shows a structure typically.
- the illumination unit has a flat plate shape for transmitting light from a fluorescent discharge tube 2 as a light source and a liquid crystal panel 11 to be described later.
- the light guide plate 1 covers the bottom surface of the light guide plate 1 (that is, the surface opposite to the light emitting surface) and the end surfaces Dl and D2, and the periphery of the fluorescent discharge tube 2 (ie, the reflector portion 20).
- the reflection sheet 3 arranged in the above and the fluorescent discharge tube 2 and the light guide plate 1 (hereinafter referred to as an illumination element 10) surrounded by the reflection sheet 3 are viewed from above (light emitting surface side).
- the liquid crystal panel 11 and the front panel are located on the light exit surface side of the illumination unit UT.
- the liquid crystal display LD is configured by disposing the bars 12.
- the display area 25 includes the liquid crystal panel 11 and the area below the area where the panel is provided.
- the fluorescent discharge tubes 2 are disposed on the two opposing end faces D1 of the light guide plate 1, respectively.
- a lead wire (not shown) connected to a power supply unit (not shown) such as an inverter for generating a high-frequency alternating current is connected to both ends of the fluorescent discharge tube 2 by soldering or the like.
- a high voltage is applied to the fluorescent discharge tube 2 during operation of the lighting unit, an exposed lead wire (not shown) and an exposed lead wire are provided to protect the electrodes of the fluorescent discharge tube 2 and ensure safety.
- the reflection sheet 3 is provided so as to cover the back surface of the light guide plate 1 and the end surfaces D 1 and D 2 of the light guide plate 1 including the fluorescent discharge tube 2.
- the illumination element 10 is formed by covering the light guide plate 1 and the fluorescent discharge tube 2 with the reflection sheet 3 in this manner, the illumination element 10 is disposed above the illumination element 10 (that is, on the light exit surface side) so as to surround the display area.
- the formed frame member 9 is attached. Thereby, the upper and side portions of the lighting element 10 are held by the frame member 9 from the outer peripheral side. Further, the lighting element 10 to which the frame member 9 is attached is housed in a box-shaped back cover 8 having a plurality of heat radiation holes 15 formed on the bottom surface.
- a shielding member 13 is provided in advance on the bottom surface of the back surface cover 8, and the frame member 9 and the back surface force bar 8 are arranged so that the lighting element 10 is arranged on the shielding member 13. Is fitted.
- the illumination element 10 is held by the back cover 8 from below through the shielding member 13.
- the light correction sheets 4 and 5 are arranged to complete the lighting unit UT.
- a liquid crystal panel 11 is arranged on the light emitting surface side of the lighting unit UT, and a front cover 12 which is a kind of a housing is mounted thereon, and a liquid crystal display is formed.
- the light guide plate 1 is made of a material such as acrylic having optical characteristics such as transmittance and refractive index that are optimal for light transmission.
- a dot pattern or a groove pattern (not shown) in which the diffusion area is changed according to the distance from 2 is provided.
- the reflection sheet 3 a white resin film having a high reflectance is used.
- a single reflecting sheet 3 continuously covering the back and end faces D 1, D 2 of the light guide plate 1, specifically, as shown in FIG. 3, is cut into a predetermined shape and guided.
- a reflection sheet 3 in which perforations S are formed corresponding to the end faces D 1 and D 2 of the light plate 1 is used.
- the reflector section 20 is formed by folding the reflection sheet 3 in a U-shape along the end face D1 from the back side of the light guide plate 1 to surround the fluorescent discharge tube 2.
- the end of the reflection sheet 3 is fixed to the outer periphery of the light exit surface of the light guide plate 1 with an adhesive 6 such as a double-sided tape.
- the reflection sheet 3 is bent along the end face D2 from the back surface side of the light guide plate 1.
- the frame member 9 and the back surface force par 8 are made of a resin material. On the bottom surface of the back cover 8, a plurality of heat radiating holes 15 are formed for releasing the heat emitted from the fluorescent discharge tubes 2 to the outside of the unit when the lighting unit UT operates.
- a housing 30 that houses and holds the illumination element 10 therein is formed.
- the shielding member 13 has a flat plate shape, and is larger than the outer periphery of the lighting element 10 and can be stored in the back cover 8 in a plan view of the lighting unit UT.
- the end of the shielding member 13 is 1 mm or more larger than the inner peripheral surface of the frame member 9 and smaller than the outer peripheral surface of the frame member 9 in a plan view.
- the shielding member 1 3, thermal conductivity 1 6 9 X 1 0 -. 5 cal ⁇ cm "1 ⁇ s' 1 ⁇ deg- 1 material such as metal having a high thermal conductivity than air is, for example, It has a thermal conductivity of 0.487 cal ⁇ cnf 1 ⁇ s- 1 ⁇ deg- 1 .
- the light correction sheets 4 and 5 provided on the light exit surface side of the light guide plate 1 are for equalizing and increasing the brightness of the light emitted from the light guide plate 1, and in the present embodiment, in addition, one diffusion sheet 4 and one prism sheet 5 are used.
- the diffusion sheet 4 is a sheet-shaped optical member used for diffusing light from the fluorescent discharge tube 2 and uniformly irradiating the light to the liquid crystal panel 11.
- the prism sheet 5 is a transparent resin film having a structure in which triangular regular grooves are cut, and condenses light emitted from the light guide plate 1 to form a liquid.
- Reference numeral 5 is provided without being bonded to any of the light guide plate 1, the reflection sheet 3, the frame member 9, and the like.
- the light correction sheet is not limited to the diffusion sheet 4 and the prism sheet 5, but sheets of various specifications having various optical characteristics can be used as appropriate.These light correction sheets may be used as needed. Arbitrary numbers are arranged.
- the light emitted by turning on the fluorescent discharge tube 2 enters the light guide plate 1 from the end face D1 of the light guide plate 1 in which the fluorescent discharge tube 2 is disposed.
- the light emitted from the fluorescent discharge tube 2 is reflected by the reflection sheet 3 and does not leak outside.
- the light enters the light guide plate 1 efficiently. Also, on the back surface of the light guide plate 1 covered with the reflection sheet 3 and at the end face D2 of the light guide plate 1 where the fluorescent discharge tube 2 is not provided, the light leaked to the outside is reflected by the reflection sheet 3 and again. It is returned into the light guide plate 1.
- the amount of light emitted from the light exit surface of the light guide plate 1 can be increased. Further, as described above, since a dot pattern or a groove pattern (not shown) for diffusing light is formed on the back surface of the light guide plate 1, light incident on the light guide plate 1 is formed. Are diffused by the pattern. Therefore, the light emitted from the light exit surface can be made more uniform and higher in brightness.
- the light emitted from the light guide plate 1 is transmitted to the diffusion sheet 4 which is After passing through the motion sheet 5, it enters the liquid crystal panel 11.
- the diffusion sheet 4 and the prism sheet 5 the light is equalized and the brightness is increased.
- the liquid crystal panel 11 performs display using the light.
- the shielding member 13 is provided between the reflection sheet 3 that covers the rear surface of the light guide 1 and the rear surface power member 8. For this reason, the gaps 16 A, 16 B and the heat radiation holes 15 serving as a path for dust to enter the display area 25 are shielded by the shielding member 13, and the display area 25 is isolated from the path for entry. It is the configuration that was done.
- the shielding member 13 is made of a material having a large thermal conductivity, the heat inside the unit is passed through the gap 16B, which is a heat insulating layer filled with air, as in the conventional case.
- the heat radiation is improved as compared with the case where the heat is radiated to the outside from the heat radiation hole 15. Therefore, various problems caused by heat can be suppressed.
- one reflection sheet 3 is used to continuously cover the reflector portion 20 and the back surface of the light guide plate 1.
- a reflector A portion that covers the portion 20 and a portion that covers the back surface of the light guide plate 1 may be separated from each other, and a reflective sheet 3 having a configuration in which the two are bonded with an adhesive or the like may be used.
- the case where two fluorescent discharge tubes 2 are provided has been described, but the number and positions of the fluorescent discharge tubes 2 are not limited to this, such as using one fluorescent discharge tube 2. Absent. Further, a light source other than the fluorescent discharge tube may be used.
- FIG. 3 is a cross-sectional view schematically showing a configuration of a lighting unit UT according to Embodiment 2 of the present invention.
- the same reference numerals as those in FIG. 1 denote the same or corresponding components.
- the lighting unit UT of the present embodiment has the same configuration as that of the first embodiment, but differs from the first embodiment in the following points. That is, in the first embodiment, the force S at which the flat shielding member 13 is provided, and in the present embodiment, the box-shaped shielding member 13 ′ is provided, and the shielding member 13 ′ is provided. Lighting element 10 is housed in 1 3 '. A step 9 a is formed at the lower end of the inner peripheral surface of the frame member 9, and the step 9 a and the shielding member 13 ′ are fitted. With such a configuration, the same effects as those of the first embodiment can be obtained. Further, by disposing a liquid crystal display panel and a front cover as shown in FIG. 2 of the first embodiment on the light emitting surface side of the illumination unit UT of the present embodiment, the liquid crystal of the first embodiment is provided. A liquid crystal display device having the same effects as the display device can be realized.
- FIG. 4 is a cross-sectional view schematically showing a configuration of a lighting unit UT according to Embodiment 3 of the present invention.
- the same reference numerals as those in FIG. 1 denote the same or corresponding components.
- the illumination cut UT of the present embodiment has the same configuration as that of the first embodiment, but differs from the first embodiment in the following points. That is, in the first embodiment, the back cover 8 and the frame member 9 are separately provided, and by fitting them together, the housing 30 for housing the lighting element 10 is formed. However, in the present embodiment, the frame member 9 and the back surface force par 8 are integrated. A molded housing 30 'is provided. Then, a flat shielding plate 13 is fitted into the bottom surface of the housing 30 ′, and the lighting element 10 is disposed on the shielding plate 13. As described above, in the present embodiment, the lighting element 10 is housed in the housing 30 ′, and the upper, side, and lower portions of the element 10 are held.
- the illumination unit and the liquid crystal display device of the present invention intrusion of dust into the display area of the liquid crystal display device can be reliably prevented, and uneven brightness due to intrusion of dust is eliminated. In addition, it is possible to prevent components of the display area from being damaged by dust. In addition, since heat dissipation is improved, it is possible to suppress various problems caused by heat generated during operation.
- the lighting unit and the liquid crystal display device using the lighting unit according to the present invention are useful as a thin and small liquid crystal display device used for AV / OA / communication device products and the like and a lighting unit thereof. is there.
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- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003556723A JP4146349B2 (ja) | 2001-12-25 | 2002-12-25 | 照明ユニット及びそれを用いた液晶表示装置 |
DE60219073T DE60219073T2 (de) | 2001-12-25 | 2002-12-25 | Beleuchtungseinheit und die einheit verwendende flüssigkristallanzeigevorrichtung |
KR1020047010000A KR100688677B1 (ko) | 2001-12-25 | 2002-12-25 | 조명 유닛 및 그것을 이용한 액정 표시 장치 |
US10/500,123 US7210841B2 (en) | 2001-12-25 | 2002-12-25 | Illumination unit and liquid crystal display device using the unit |
EP02793369A EP1460336B1 (en) | 2001-12-25 | 2002-12-25 | Illumination unit and liquid crystal display device using the unit |
AU2002360006A AU2002360006A1 (en) | 2001-12-25 | 2002-12-25 | Illumination unit and liquid crystal display device using the unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001391439 | 2001-12-25 | ||
JP2001-391439 | 2001-12-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003056236A1 true WO2003056236A1 (fr) | 2003-07-10 |
Family
ID=19188520
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/013492 WO2003056236A1 (fr) | 2001-12-25 | 2002-12-25 | Unite d'eclairage et dispositif d'affichage a cristaux liquides utilisant cette unite |
Country Status (8)
Country | Link |
---|---|
US (1) | US7210841B2 (ja) |
EP (1) | EP1460336B1 (ja) |
JP (1) | JP4146349B2 (ja) |
KR (1) | KR100688677B1 (ja) |
CN (1) | CN1608184A (ja) |
AU (1) | AU2002360006A1 (ja) |
DE (1) | DE60219073T2 (ja) |
WO (1) | WO2003056236A1 (ja) |
Cited By (6)
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WO2005064392A1 (en) * | 2003-12-31 | 2005-07-14 | Mrc Co., Ltd. | Support frame to support flat fluorescent lamp for liquid crystal displays |
CN100363820C (zh) * | 2004-06-01 | 2008-01-23 | Nec液晶技术株式会社 | 发光装置以及液晶显示装置 |
CN100376980C (zh) * | 2004-02-05 | 2008-03-26 | 鸿富锦精密工业(深圳)有限公司 | 光源罩及背光模组 |
CN100485478C (zh) * | 2004-01-05 | 2009-05-06 | 鸿富锦精密工业(深圳)有限公司 | 直下式背光模组 |
JP2014191921A (ja) * | 2013-03-26 | 2014-10-06 | Toshiba Corp | 照明装置 |
CN111708198A (zh) * | 2020-06-24 | 2020-09-25 | 维沃移动通信有限公司 | 显示组件和电子设备 |
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US7001048B2 (en) * | 2003-12-11 | 2006-02-21 | Heng Sheng Kuo | Reflection-diffusion structure adopted for a light guide plate |
CN100483206C (zh) * | 2005-06-01 | 2009-04-29 | 鸿富锦精密工业(深圳)有限公司 | 显示装置 |
KR100687926B1 (ko) | 2005-06-13 | 2007-02-27 | 삼성전자주식회사 | 액정표시장치 |
JP4469773B2 (ja) * | 2005-09-20 | 2010-05-26 | 東芝モバイルディスプレイ株式会社 | 照明ユニット及びそれを用いた液晶表示装置 |
US7864265B2 (en) * | 2005-11-08 | 2011-01-04 | Sharp Kabushiki Kaisha | Lamp holder, and backlight device and liquid crystal display device using such lamp holder |
TWI334050B (en) * | 2006-07-21 | 2010-12-01 | Coretronic Corp | Backlight module |
KR20080022883A (ko) * | 2006-09-08 | 2008-03-12 | 삼성전자주식회사 | 백라이트 어셈블리 |
US20080074882A1 (en) * | 2006-09-25 | 2008-03-27 | Jin-Sing Chou | Light source device structure |
TWI354164B (en) * | 2006-10-03 | 2011-12-11 | Au Optronics Corp | Liquid crystal display and back light module there |
KR100836488B1 (ko) * | 2006-11-09 | 2008-06-09 | 삼성에스디아이 주식회사 | 휴대용 표시장치 |
CN101610619B (zh) * | 2008-06-20 | 2012-12-05 | 国琏电子(上海)有限公司 | 背光模块 |
KR101529556B1 (ko) | 2008-12-26 | 2015-06-17 | 엘지디스플레이 주식회사 | 방열이 용이한 액정표시소자 |
TWI395015B (zh) * | 2009-08-04 | 2013-05-01 | Au Optronics Corp | 顯示裝置 |
KR101244487B1 (ko) * | 2009-08-05 | 2013-03-18 | 엘지디스플레이 주식회사 | 백라이트 유닛 및 이를 구비한 액정표시장치 |
JP5161381B1 (ja) * | 2011-06-07 | 2013-03-13 | シャープ株式会社 | 表示装置及びテレビジョン受信機 |
CN103017024A (zh) * | 2012-11-29 | 2013-04-03 | 冠捷显示科技(厦门)有限公司 | 背光模组 |
EP3013294B1 (en) * | 2013-06-28 | 2019-09-25 | 3M Innovative Properties Company | Fibrin-coated wound dressing |
DE102014112546A1 (de) * | 2014-09-01 | 2016-03-03 | Rehau Ag + Co | Lichtverteilvorrichtung und Leuchtvorrichtung |
USD757930S1 (en) | 2015-03-19 | 2016-05-31 | Insleep Technologies, Llc | Nasal pillow |
CN104763931B (zh) * | 2015-04-09 | 2017-06-13 | 深圳市华星光电技术有限公司 | 背光模组及液晶显示器 |
CN105116605A (zh) * | 2015-06-26 | 2015-12-02 | 武汉华星光电技术有限公司 | 背光模组及液晶显示器 |
CN106764639A (zh) * | 2015-11-19 | 2017-05-31 | 扬升照明股份有限公司 | 显示装置及其组装方法 |
JP6523360B2 (ja) * | 2016-06-24 | 2019-05-29 | ミネベアミツミ株式会社 | 面状照明装置 |
CN108594536B (zh) * | 2018-07-02 | 2021-04-20 | 惠科股份有限公司 | 背光模组及显示屏 |
CN110568662B (zh) * | 2019-08-14 | 2024-05-10 | 武汉华星光电技术有限公司 | 背光模组及显示面板 |
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JPH11204973A (ja) * | 1998-01-09 | 1999-07-30 | Nanao Corp | 電子機器の放熱構造 |
JP2001075096A (ja) * | 1999-08-03 | 2001-03-23 | Samsung Electronics Co Ltd | 液晶表示装置 |
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US5182660A (en) * | 1990-08-03 | 1993-01-26 | Rohm Co., Ltd. | Back-light type liquid crystal display |
DE69323597T2 (de) * | 1992-11-12 | 1999-08-19 | Canon K.K. | Flüssigkristall-Anzeigevorrichtung |
JPH06194650A (ja) * | 1992-12-25 | 1994-07-15 | Citizen Watch Co Ltd | 表示装置 |
JP3127774B2 (ja) * | 1995-03-31 | 2001-01-29 | セイコーエプソン株式会社 | シールド材および液晶表示装置 |
JPH09171173A (ja) * | 1995-12-20 | 1997-06-30 | Hitachi Ltd | 液晶パネルの防塵装置 |
JP2000148028A (ja) | 1998-11-13 | 2000-05-26 | Toshiba Corp | 平面表示装置 |
KR20000050379A (ko) * | 1999-01-08 | 2000-08-05 | 윤종용 | 액정표시기 모듈용 백라이트 어셈블리 |
KR100367012B1 (ko) * | 2000-08-21 | 2003-01-09 | 엘지.필립스 엘시디 주식회사 | 액정표시장치 |
US6930737B2 (en) * | 2001-01-16 | 2005-08-16 | Visteon Global Technologies, Inc. | LED backlighting system |
KR100784804B1 (ko) * | 2001-05-07 | 2007-12-14 | 삼성전자주식회사 | 액정 표시 장치 및 제조 방법 |
KR100757794B1 (ko) * | 2001-09-03 | 2007-09-11 | 삼성전자주식회사 | 액정 표시 모듈 및 이를 갖는 액정 표시 장치 |
-
2002
- 2002-12-25 EP EP02793369A patent/EP1460336B1/en not_active Expired - Fee Related
- 2002-12-25 US US10/500,123 patent/US7210841B2/en not_active Expired - Fee Related
- 2002-12-25 CN CNA028261763A patent/CN1608184A/zh active Pending
- 2002-12-25 AU AU2002360006A patent/AU2002360006A1/en not_active Abandoned
- 2002-12-25 DE DE60219073T patent/DE60219073T2/de not_active Expired - Lifetime
- 2002-12-25 JP JP2003556723A patent/JP4146349B2/ja not_active Expired - Lifetime
- 2002-12-25 KR KR1020047010000A patent/KR100688677B1/ko not_active IP Right Cessation
- 2002-12-25 WO PCT/JP2002/013492 patent/WO2003056236A1/ja active IP Right Grant
Patent Citations (2)
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JPH11204973A (ja) * | 1998-01-09 | 1999-07-30 | Nanao Corp | 電子機器の放熱構造 |
JP2001075096A (ja) * | 1999-08-03 | 2001-03-23 | Samsung Electronics Co Ltd | 液晶表示装置 |
Non-Patent Citations (1)
Title |
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See also references of EP1460336A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005064392A1 (en) * | 2003-12-31 | 2005-07-14 | Mrc Co., Ltd. | Support frame to support flat fluorescent lamp for liquid crystal displays |
CN100485478C (zh) * | 2004-01-05 | 2009-05-06 | 鸿富锦精密工业(深圳)有限公司 | 直下式背光模组 |
CN100376980C (zh) * | 2004-02-05 | 2008-03-26 | 鸿富锦精密工业(深圳)有限公司 | 光源罩及背光模组 |
CN100363820C (zh) * | 2004-06-01 | 2008-01-23 | Nec液晶技术株式会社 | 发光装置以及液晶显示装置 |
JP2014191921A (ja) * | 2013-03-26 | 2014-10-06 | Toshiba Corp | 照明装置 |
CN111708198A (zh) * | 2020-06-24 | 2020-09-25 | 维沃移动通信有限公司 | 显示组件和电子设备 |
Also Published As
Publication number | Publication date |
---|---|
CN1608184A (zh) | 2005-04-20 |
US20050018416A1 (en) | 2005-01-27 |
US7210841B2 (en) | 2007-05-01 |
DE60219073T2 (de) | 2007-12-13 |
DE60219073D1 (de) | 2007-05-03 |
EP1460336A4 (en) | 2005-06-01 |
JPWO2003056236A1 (ja) | 2005-08-11 |
EP1460336A1 (en) | 2004-09-22 |
AU2002360006A1 (en) | 2003-07-15 |
EP1460336B1 (en) | 2007-03-21 |
KR100688677B1 (ko) | 2007-03-02 |
KR20040071751A (ko) | 2004-08-12 |
JP4146349B2 (ja) | 2008-09-10 |
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