WO2012026162A1 - Dispositif d'éclairage, dispositif d'affichage et dispositif de téléviseur - Google Patents

Dispositif d'éclairage, dispositif d'affichage et dispositif de téléviseur Download PDF

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Publication number
WO2012026162A1
WO2012026162A1 PCT/JP2011/060879 JP2011060879W WO2012026162A1 WO 2012026162 A1 WO2012026162 A1 WO 2012026162A1 JP 2011060879 W JP2011060879 W JP 2011060879W WO 2012026162 A1 WO2012026162 A1 WO 2012026162A1
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WO
WIPO (PCT)
Prior art keywords
light
light source
heat
guide plate
lighting device
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Application number
PCT/JP2011/060879
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English (en)
Japanese (ja)
Inventor
吉川貴博
Original Assignee
シャープ株式会社
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Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2012026162A1 publication Critical patent/WO2012026162A1/fr

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    • 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
    • G02B6/0085—Means for removing heat created by the light source from the package
    • 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
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package

Definitions

  • the present invention relates to a lighting device, particularly a lighting device using a light guide plate, a display device using the lighting device, and a television receiver.
  • a display device provided with a liquid crystal panel as a flat display portion having many features such as a thinner and lighter than a conventional cathode ray tube. Is becoming mainstream.
  • a liquid crystal display device includes an illumination device (backlight) that emits light, and a liquid crystal panel that displays a desired image by serving as a shutter for light from a light source provided in the illumination device. Is provided.
  • information such as characters and images included in the video signal of the television broadcast is displayed on the display surface of the liquid crystal panel.
  • the illumination device is roughly classified into a direct type and an edge light type depending on the arrangement of the light source with respect to the liquid crystal panel as an object to be irradiated with light, but the liquid crystal display device has recently been made thinner than the direct type.
  • An edge light type that is easy to draw is generally used. That is, in the edge light type illumination device, the light source is arranged on the side of the liquid crystal panel to reduce the thickness, and a light guide plate having a light emitting surface arranged to face the non-display surface of the liquid crystal panel is provided. The light from the light source is applied to the liquid crystal panel.
  • the FPC Flexible Printed Circuit; light source substrate
  • the FPC via a heat conductive sheet is used.
  • a lower chassis that also serves as a heat sink.
  • a pressing plate is provided on the mounting surface side of the FPC and that the FPC is held between the pressing plate and the lower chassis.
  • heat from the light emitting diode can be efficiently radiated to the atmosphere via the FPC and the lower chassis (heat radiating plate), and the luminous efficiency of the light emitting diode is reduced and the length of the light emitting diode is increased. It was possible to extend the service life.
  • the light guide plate is provided to face the light emitting diode in order to receive light from the light emitting diode.
  • the edge part was attached on the back plate metal provided so that the opening of a lower chassis (heat radiating member) might be plugged up.
  • heat from the light emitting diode is transmitted to the light emitting diode via the FPC (light source board), the lower chassis, the back metal plate, and the light guide plate, which may adversely affect the light emitting diode. was there.
  • heat from the light emitting diode is sequentially conducted through the FPC, the lower chassis, the back metal plate, and the light guide plate, and is radiated to the light emitting diode itself.
  • heat from the light emitting diode is sequentially conducted through the FPC, the lower chassis, the back metal plate, and the light guide plate, and is radiated to the light emitting diode itself.
  • the present invention can suppress the heat from the light source from being transmitted to the light source through the light guide plate, and can prevent the adverse effect of the heat from being generated in the light source.
  • Another object of the present invention is to provide a display device using the same, and a television receiver.
  • an illumination device includes a light source, a light guide plate that guides light from the light source in a predetermined propagation direction, and emits the light to an object to be irradiated.
  • the mounted light source board and the light source board are attached, and a lighting device including a heat radiating member that radiates heat from the light source,
  • the heat dissipation member is provided with a support portion that supports an end portion of the light guide plate, and In the heat radiating member, the distance from the mounting surface of the light source substrate to the support portion is set to a value within a predetermined range.
  • a support member that supports the end portion of the light guide plate is provided on the heat dissipating member that dissipates heat from the light source.
  • the distance from the mounting surface of the light source substrate to the support portion is set to a value within a predetermined range. Accordingly, it is possible to lengthen a heat conduction path from the light source that passes from the light source to the light source substrate, the heat radiating member, the support portion, and the light guide plate while preventing the positional deviation between the light guide plate and the light source.
  • heat from the light source can be prevented from being transmitted to the light source through the light guide plate, and adverse effects of heat can be prevented from occurring in the light source.
  • the light source In the illumination device, the light source, the light guide plate, the light source substrate, and a housing for housing the heat dissipation member,
  • the heat dissipation member may be attached to the housing so that heat from the light source is dissipated.
  • the heat from the light source can be radiated from the housing while improving the assembly workability of the lighting device, the heat from the light source can be radiated efficiently.
  • the light source In the illumination device, the light source, the light guide plate, the light source substrate, and a housing for housing the heat dissipation member,
  • the heat dissipating member and the housing may be integrally configured.
  • the number of parts of the lighting device can be reduced.
  • a support member configured separately from the heat dissipation member may be used as the support portion.
  • the end of the light guide plate can be supported more appropriately and more easily.
  • the support member has a lower thermal conductivity than the heat dissipation member.
  • the propagation of heat from the light source to the light guide plate can be further suppressed, and the adverse effect of heat on the light source can be more reliably prevented.
  • the value of the distance is set by using a calorific value of the light source.
  • the distance value can be set more appropriately, and the adverse effect of heat on the light source can be more reliably prevented.
  • the distance value is set using at least one of a weight and a material of the light guide plate.
  • a light emitting diode is used as the light source.
  • the display device of the present invention is characterized by using any one of the above lighting devices.
  • the television receiver of the present invention is characterized by using the above display device.
  • heat from the light source can be prevented from being transmitted to the light source through the light guide plate, and adverse effects of heat can be prevented from being generated in the light source. Therefore, a long-life and high-performance display device and television receiver can be easily configured.
  • the illuminating device which can suppress that the heat
  • FIG. 1 is an exploded perspective view for explaining a television receiver and a liquid crystal display device according to a first embodiment of the present invention.
  • FIG. 2 is a diagram for explaining a main configuration of the liquid crystal display device.
  • FIG. 3 is a diagram for explaining the configuration of the liquid crystal panel shown in FIG.
  • FIG. 4 is a plan view showing the lighting device shown in FIG.
  • FIG. 5 is an enlarged view showing a main configuration of the lighting device.
  • FIG. 6 is a graph of a simulation result showing the relationship between the distance shown in FIG. 5 and the temperature on the LED substrate shown in FIG.
  • FIG. 7 is a diagram for explaining a main configuration of a liquid crystal display device according to the second embodiment of the present invention.
  • FIG. 8 is an enlarged view showing a main configuration of the illumination device shown in FIG.
  • FIG. 9 is a diagram for explaining a main configuration of a liquid crystal display device according to the third embodiment of the present invention.
  • FIG. 10 is a plan view showing the lighting device shown in FIG.
  • FIG. 11 is an enlarged view showing a main configuration of the illumination device shown in FIG.
  • FIG. 12 is an enlarged view showing a main configuration of the illumination device included in the liquid crystal display device according to the fourth embodiment of the present invention.
  • the illumination device the display device, and the television receiver of the present invention will be described with reference to the drawings.
  • the case where the present invention is applied to a transmissive liquid crystal display device will be described as an example.
  • the dimension of the structural member in each figure does not faithfully represent the actual dimension of the structural member, the dimensional ratio of each structural member, or the like.
  • FIG. 1 is an exploded perspective view for explaining a television receiver and a liquid crystal display device according to a first embodiment of the present invention.
  • a television receiver Tv of the present embodiment includes a liquid crystal display device 1 as a display device, and is configured to be able to receive a television broadcast by an antenna, a cable (not shown), or the like.
  • the liquid crystal display device 1 is erected by a stand D while being housed in the front cabinet Ca and the back cabinet Cb.
  • the display surface 1a of the liquid crystal display device 1 is configured to be visible through the front cabinet Ca.
  • the display surface 1a is installed by the stand D so as to be parallel to the direction of action of gravity (vertical direction).
  • the television receiver Tv an image corresponding to a television broadcast video signal received by a TV tuner unit (not shown) is displayed on the display surface 1a, and audio is output from a speaker Ca1 provided in the front cabinet Ca. Is played out.
  • the back cabinet Cb is formed with a large number of ventilation holes so that heat generated by the lighting device, the power source, and the like can be appropriately dissipated.
  • liquid crystal display device 1 of the present embodiment will be specifically described with reference to FIG.
  • FIG. 2 is a diagram for explaining a main configuration of the liquid crystal display device.
  • the liquid crystal display device 1 of the present embodiment includes a liquid crystal panel 2 in which the upper side of FIG. 2 is installed as a viewing side (display surface side), and a non-display surface side of the liquid crystal panel 2 (lower side of FIG. 2). And an illuminating device 3 of the present invention that generates illumination light for illuminating the liquid crystal panel 2.
  • the liquid crystal panel 2 and the illumination device 3 are assembled with each other inside the bezel 4 having an L-shaped cross section, and illumination light from the illumination device 3 is incident on the liquid crystal panel 2.
  • the transmission type liquid crystal display device 1 is integrated.
  • the display surface 1 a is defined by a rectangular opening 4 a provided in the bezel 4. That is, in the liquid crystal display device 1, the display surface of the liquid crystal panel 2 visually recognized through the opening 4a constitutes the display surface 1a.
  • the liquid crystal panel 2 is provided with a liquid crystal layer, a color filter substrate and an active matrix substrate as a pair of substrates sandwiching the liquid crystal layer, and an outer surface of each of the color filter substrate and the active matrix substrate.
  • a polarizing plate is provided (not shown).
  • the polarization state of the illumination light incident through the polarizing plate on the illumination device 3 side is modulated by the liquid crystal layer and passes through the polarizing plate on the opening 4 a side (display surface 1 a side).
  • the desired image is displayed by controlling the amount of light to be controlled.
  • liquid crystal panel 2 of the present embodiment will be specifically described with reference to FIG.
  • FIG. 3 is a diagram for explaining the configuration of the liquid crystal panel shown in FIG.
  • the liquid crystal display device 1 includes a panel control unit 12 that controls driving of a liquid crystal panel 2 (FIG. 2) as a display unit that displays information such as characters and images, and the panel control unit.
  • a source driver 13 and a gate driver 14 that operate based on an instruction signal from 12 are provided.
  • the panel control unit 12 is provided in a control device (not shown) provided in the liquid crystal display device 1, and receives a video signal from the outside of the liquid crystal display device 1. In addition, the panel control unit 12 performs predetermined image processing on the input video signal to generate each instruction signal to the source driver 13 and the gate driver 14, and the input video signal And a frame buffer 12b capable of storing display data for one frame included. Then, the panel control unit 12 controls the driving of the source driver 13 and the gate driver 14 according to the input video signal, so that information corresponding to the video signal is displayed on the liquid crystal panel 2.
  • the source driver 13 and the gate driver 14 are installed on the active matrix substrate, for example. Specifically, the source driver 13 is installed on the surface of the active matrix substrate so as to be along the lateral direction of the liquid crystal panel 2 in the outer area of the effective display area A of the liquid crystal panel 2 as a display panel. Further, the gate driver 14 is installed on the surface of the active matrix substrate so as to be along the vertical direction of the liquid crystal panel 2 in the outer region of the effective display region A.
  • the source driver 13 and the gate driver 14 are drive circuits that drive a plurality of pixels P provided on the liquid crystal panel 2 side by pixel.
  • the source driver 13 and the gate driver 14 include a plurality of source lines S1 to S1.
  • SM is an integer of 2 or more, hereinafter collectively referred to as “S”
  • G gate wirings G1 to GN
  • S and G constitute a data wiring and a scanning wiring, respectively, on a transparent glass material or a transparent synthetic resin substrate (not shown) included in the active matrix substrate. They are arranged in a matrix so as to cross each other.
  • the source wiring S is provided on the substrate so as to be parallel to the matrix-like column direction (vertical direction of the liquid crystal panel 2), and the gate wiring G is arranged in the matrix-like row direction (horizontal of the liquid crystal panel 2). Is provided on the substrate so as to be parallel to (direction).
  • the thin film transistor 15 as a switching element and the pixel P having the pixel electrode 16 connected to the thin film transistor 15 are provided.
  • the common electrode 17 is configured to face the pixel electrode 16 with the liquid crystal layer provided on the liquid crystal panel 2 interposed therebetween. That is, in the active matrix substrate, the thin film transistor 15, the pixel electrode 16, and the common electrode 17 are provided for each pixel.
  • a plurality of pixels P are formed in each region partitioned in a matrix by the source wiring S and the gate wiring G.
  • the plurality of pixels P include red (R), green (G), and blue (B) pixels. These RGB pixels are sequentially arranged in this order, for example, in parallel with the gate wirings G1 to GN. Further, these RGB pixels can display corresponding colors by a color filter layer (not shown) provided on the color filter substrate side.
  • the gate driver 14 scans the gate electrodes G1 to GN with respect to the gate wirings G1 to GN based on the instruction signal from the image processing unit 12a (gate signal). Signal) in sequence.
  • the source driver 13 also supplies a data signal (voltage signal (gradation voltage)) corresponding to the luminance (gradation) of the display image to the corresponding source wirings S1 to SM based on the instruction signal from the image processing unit 12a. Output.
  • FIG. 4 is a plan view showing the illumination device shown in FIG.
  • the illumination device 3 of the present embodiment includes a light emitting diode 5 as a light source, an LED substrate 6 as a light source substrate on which the light emitting diode 5 is mounted, and light from the light emitting diode 5. And a light guide plate 7 on which light enters.
  • a white (W) light emitting diode that emits white light is used.
  • two LED substrates 6 are used, and each LED substrate 6 has a plurality of, for example, eight light emitting elements arranged linearly. Diodes 5 are mounted at a predetermined interval from each other.
  • the light guide plate 7 is made of, for example, a synthetic resin such as a transparent acrylic resin or a transparent glass material having a thickness of about 1.5 mm to 4.0 mm, and light from the light emitting diode (light source) 5 enters the light guide plate 7. Is done. That is, in the light guide plate 7, the two side surfaces facing each other function as light incident surfaces on which light from the light emitting diodes 5 is incident. Further, for example, a reflection sheet 8 is installed on the side of the light guide plate 7 opposite to the liquid crystal panel 2 (opposite surface side). The light guide plate 7 guides the light from the light emitting diode 5 in a predetermined propagation direction (left and right direction in FIG.
  • an optical sheet 11 such as a lens sheet or a diffusion sheet is provided on the liquid crystal panel 2 side (light emitting surface side) of the light guide plate 7, and the light emitting diode 5 led inside the light guide plate 7 in the propagation direction.
  • the light from the light is converted into the planar illumination light having a uniform luminance and applied to the liquid crystal panel 2.
  • the lighting device 3 of the present embodiment is provided with a bottomed chassis 9 having an opening on the liquid crystal panel 2 side and a rectangular opening, and is attached to an edge of the chassis 9.
  • a P (plastic) chassis 10 is provided.
  • a metal material such as a galvanized steel plate is used for the chassis 9.
  • the chassis 9 includes a flat bottom portion 9 a and a side surface portion 9 b erected with respect to the bottom portion 9 a at four sides of the bottom portion 9 a. It has.
  • the optical sheet 11 is disposed in the opening of the P chassis 10 so as to increase the luminance of the light from the light emitting surface of the light guide plate 7 and enter the liquid crystal panel 2.
  • the chassis 9 constitutes a housing that houses a light emitting diode (light source) 5, a light guide plate 7, an LED substrate (light source substrate) 6, and a heat radiating member that radiates heat from the light emitting diode 5. . Furthermore, the chassis 9 is configured integrally with the heat dissipation member. That is, in the chassis 9, as shown in FIGS. 2 and 4, the LED substrate 6 is attached to the attachment surface 9 b 1 of the side surface portion 9 b, and heat from the light emitting diode 5 is transmitted through the LED substrate 6, The transmitted heat is radiated at the side surface portion 9b and the bottom portion 9a.
  • a support portion 9c that supports the end portion of the light guide plate 7 is provided on the bottom surface 9a1 of the bottom portion 9a. Specifically, as shown by a dotted line in FIG. 4, in the chassis 9, the support portion 9 c supports the end portion on the long side of the light guide plate 7 from the bottom portion 9 a side.
  • the distance between the mounting surface 9 b 1 and the support portion 9 c is set to an appropriate value within a predetermined range, and heat generated in the light emitting diode 5 is transmitted through the light guide plate 7 to the light emitting diode. It is comprised so that it can suppress radiating to 5 as much as possible.
  • FIG. 5 is an enlarged view showing a main configuration of the lighting device.
  • the distance H from the mounting surface 9b1 of the LED board 6 of the chassis 9 to the support portion 9c that supports the end portion of the light guide plate 7 is within a predetermined distance range, for example, 20 mm.
  • the value is set within a range of up to 100 mm.
  • the value of the distance H is set using the amount of heat generated by the light emitting diode 5, and the heat from the light emitting diode 5 is reliably suppressed from being transmitted to the light emitting diode 5 through the light guide plate 7. It is supposed to be.
  • the value of the distance H is set by using at least one of the weight and material of the light guide plate 7 to ensure that the end of the light guide plate 7 is deformed such as depending on the support portion 9c. It can be prevented.
  • a support portion 9c that supports the end portion of the light guide plate 7 is provided in the chassis (heat radiating member) 9 that radiates heat from the light emitting diode (light source) 5. It has been. Further, in the chassis 9, the distance H from the mounting surface 9b1 of the LED substrate (light source substrate) 6 to the support portion 9c is set to a value within a predetermined range. Thereby, in the illuminating device 3 of this embodiment, while preventing the position shift of the light guide plate 7 and the light emitting diode 5, the LED substrate 6, the side surface portion 9b of the chassis 9, the bottom portion 9a, and the support portion are prevented.
  • the heat conduction path from the light emitting diode 5 through 9c and the light guide plate 7 can be lengthened.
  • heat from the light emitting diode 5 can be suppressed from being transmitted to the light emitting diode 5 through the light guide plate 7. It is possible to prevent adverse effects of heat such as a decrease in the light emission efficiency and a decrease in the lifetime.
  • FIG. 6 is a simulation result graph showing the relationship between the distance shown in FIG. 5 and the temperature on the LED substrate shown in FIG.
  • the inventors of the present invention calculated the temperature on the surface of the LED substrate 6 when the value of the distance H was changed by performing a simulation when the light emitting diode 5 was driven to light. As a result, as illustrated in the graph 70 of FIG. 6, it was confirmed that the temperature on the surface of the LED substrate 6 greatly decreased by setting the value of the distance H to 20 mm or more. That is, by setting the value of the distance H to 20 mm or more, it is possible to suppress the heat from the light emitting diode 5 from being transmitted to the light emitting diode 5 through the light guide plate 7. It was demonstrated that the above adverse effects did not occur.
  • the value of the distance H is set to a value exceeding 100 mm, it becomes difficult to properly support the end portion of the light guide plate 7 by the support portion 9c, and the light guide plate 7 and the light emitting diode 5 are displaced. It has become difficult to prevent this.
  • the heat dissipation member and the chassis (housing) 9 are integrally configured, the number of parts of the lighting device 3 can be reduced.
  • the value of the distance H is set using the emitted-heat amount of the light emitting diode 5
  • the value of the distance H can be set more appropriately, and the bad influence of heat is received. It can prevent more reliably generating in the light emitting diode 5.
  • the edge part of the light guide plate 7 is with respect to the support part 9c. It is possible to reliably prevent deformation such as sagging and to prevent the positional deviation between the light guide plate 7 and the light emitting diode 5 more reliably.
  • the illuminating device 3 that can be used is used, the long-life and high-performance liquid crystal display device (display device) 1 and the television receiver Tv can be easily configured.
  • FIG. 7 is a diagram for explaining a main configuration of a liquid crystal display device according to the second embodiment of the present invention.
  • FIG. 8 is an enlarged view showing a main configuration of the illumination device shown in FIG.
  • the main difference between the present embodiment and the first embodiment is that, in a chassis (housing), an LED substrate (light source substrate) is attached and a side surface portion having a rectangular opening, This is a point provided with a bottom portion that closes the opening portion of the side surface portion.
  • symbol is attached
  • the chassis 19 of the lighting device 3 constitutes the casing, and includes a side surface portion 19 b having a rectangular opening, and an opening portion of the side surface portion 19 b. Is provided with a bottom portion 19a.
  • the chassis 19 also serves as the heat radiating member, as in the first embodiment. That is, in the chassis 19, the LED substrate (light source substrate) 6 is attached to the attachment surface 19b1 of the side surface portion 19b.
  • the chassis 19 a metal material such as a galvanized steel plate is used for the bottom portion 19a.
  • the side surface portion 19b is made of, for example, a metal material having excellent heat dissipation, such as aluminum, and is configured so that heat from the light emitting diode 5 can be efficiently radiated as compared with that of the first embodiment. Has been.
  • a support portion 19c that supports the end portion of the light guide plate 7 is provided on the bottom surface 19a1 of the bottom portion 19a.
  • the distance H from the mounting surface 19b1 of the LED substrate 6 to the support portion 19c that supports the end of the light guide plate 7 is within a predetermined distance, for example, 20 mm to 100 mm. It is set to a value within the range. Further, in the chassis 19, the value of the distance H is set using the amount of heat generated by the light emitting diode 5 and at least one of the weight and material of the light guide plate 7, as in the first embodiment. .
  • the present embodiment can achieve the same operations and effects as the first embodiment.
  • FIG. 9 is a diagram for explaining a main configuration of a liquid crystal display device according to the third embodiment of the present invention.
  • FIG. 10 is a plan view showing the lighting device shown in FIG.
  • FIG. 11 is an enlarged view showing a main configuration of the illumination device shown in FIG.
  • the main difference between the present embodiment and the first embodiment is that a heat spreader (heat radiating member) configured separately from the chassis (housing) is used and heat from the light emitting diode is radiated. As shown, the heat spreader is attached to the chassis.
  • symbol is attached
  • a chassis 29 as the casing and a heat spreader 28 as a heat radiating member configured separately from the chassis 29 are provided.
  • a metal material such as a galvanized steel plate is used for the chassis 29.
  • the chassis 29 includes a flat bottom portion 29a and a side surface portion 29b erected with respect to the bottom portion 29a at four sides of the bottom portion 29a. It has.
  • the heat spreader 28 is made of, for example, a metal material having excellent heat dissipation such as aluminum.
  • the heat spreader 28 also includes a side surface portion 28a and a bottom portion 28b provided so as to be orthogonal to each other with reference to FIG. It has a cross-sectional L-shaped shape.
  • the LED substrate (light source substrate) 6 is attached to the attachment surface 28a1 of the side surface portion 28a.
  • the heat spreader 28 is attached to the chassis 29 so that the heat from the light emitting diode 5 is dissipated.
  • the side surface portion 28 a is attached to the attachment surface 29 b 1 of the side surface portion 29 b of the chassis 29, and the bottom portion 28 b is attached to the bottom surface 29 a 1 of the bottom portion 29 a of the chassis 29.
  • a support portion 28c that supports the end portion of the light guide plate 7 is provided on the surface of the bottom portion 28b.
  • the distance H from the mounting surface 28a1 of the LED substrate 6 to the support portion 28c that supports the end of the light guide plate 7 is within a predetermined distance range, for example, 20 mm to 100 mm. It is set to a value within the range. Further, in the heat spreader 28, the value of the distance H is set using the amount of heat generated by the light emitting diode 5 and at least one of the weight and material of the light guide plate 7.
  • the present embodiment can achieve the same operations and effects as the first embodiment. Moreover, in this embodiment, since the heat spreader (heat radiating member) 28 attached to the LED substrate (light source substrate) 6 and the chassis 29 (housing) are separately configured, the assembly workability of the lighting device 3 is improved. Can be made. Further, since the heat spreader 28 is attached to the chassis 29 so that the heat from the light emitting diode 5 is dissipated, the heat from the light emitting diode 5 can be dissipated from the chassis 29 as well. It is possible to efficiently dissipate the heat.
  • FIG. 12 is an enlarged view showing a main configuration of the illumination device included in the liquid crystal display device according to the fourth embodiment of the present invention.
  • the main difference between the present embodiment and the first embodiment is that a support member configured separately from the chassis (heat radiating member) is used as the support portion.
  • symbol is attached
  • a support member 39 configured separately from the chassis (heat radiating member) 9 is used.
  • the support member 39 constitutes a support portion, and is fixed to the bottom surface 9 a 1 of the bottom portion 9 a of the chassis 9.
  • the support member 39 is made of a material having a lower thermal conductivity than that of the chassis 9, for example, a synthetic resin such as a polycarbonate resin or an acrylic resin.
  • the present embodiment can achieve the same operations and effects as the first embodiment. Further, in the present embodiment, since the support member 39 configured separately from the chassis (heat radiating member) 9 is used as the support portion, the end portion of the light guide plate 7 is more appropriately and more easily supported. can do. In the present embodiment, since the support member 39 has a lower thermal conductivity than the chassis 9, the propagation of heat from the light emitting diode (light source) 5 to the light guide plate 7 is further suppressed. It is possible to prevent the adverse effect of heat from occurring in the light emitting diode 5 more reliably.
  • a support member 39 configured separately from the chassis (heat radiating member) 19 and the heat spreader (heat radiating member) 28 may be used.
  • the present invention is applied to a transmissive liquid crystal display device.
  • the lighting device of the present invention is not limited to this, and a transflective liquid crystal display device or a liquid crystal display device is not limited thereto.
  • the present invention can be applied to various display devices such as a projection display device using a panel as a light valve.
  • the present invention is installed on a light box for illuminating X-ray film or photographic negatives for irradiating light to make it easy to see, or on a signboard or a wall in a station. It can be suitably used as a lighting device for a light emitting device that illuminates advertisements and the like.
  • the apparatus only needs to have a light source and a light guide plate that guides light from the light source in a predetermined propagation direction and emits the light to the irradiated object.
  • the light source is opposed to one side surface of the light guide plate. It may be arranged. Further, a plurality of rows of light sources may be arranged to face one side surface of the light guide plate.
  • the light source of the present invention is not limited to this, and a discharge tube such as a cold cathode fluorescent tube or a hot cathode fluorescent tube is used.
  • a light source such as a lamp such as a light bulb or a light emitting element such as an organic EL (Electronic Luminescence) or an inorganic EL element can also be used as a light source.
  • a light-emitting diode as a light source as in the above-described embodiments in that a lighting device having low power consumption and excellent environmental characteristics can be easily configured.
  • the light-emitting diode of the present invention is not limited to the white light-emitting diode described above.
  • a so-called 3-in-1 type light-emitting diode in which RGB light-emitting diodes are integrated, and four light-emitting diodes such as RGBW and GRGB are integrated. It is also possible to use so-called four-in-one (4 in 1) type light-emitting diodes or R, G, B single-color individual light-emitting diodes.
  • the present invention can suppress the heat from the light source from being transmitted to the light source through the light guide plate, and can prevent the adverse effect of the heat from being generated in the light source, and a display using the same It is useful for a device and a television receiver.
  • Liquid crystal display device (display device) 2 LCD panel (irradiated object) 3 Lighting device 5 Light-emitting diode (light source) 6 LED board (light source board) 7 Light guide plate 9, 19 Chassis (heat dissipation member, housing) 9b1, 19b1 Mounting surface 9c, 19c Support portion 28 Heat spreader (heat radiating member) 28a1 Mounting surface 28c Support section 29 Chassis (housing) 39 Support member (support part) Tv TV receiver H Distance

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un dispositif d'éclairage (3) pourvu de diodes électroluminescentes (sources lumineuses) (5), d'une plaque (7) guide de lumière, de cartes de circuit imprimé à DEL (cartes de circuit imprimé de source lumineuse) (6) et d'un châssis (élément de dissipation thermique) (9). Ledit châssis (9) comporte des parties de support (9c) formées sur celui-ci et qui maintiennent les parties d'extrémité de la plaque (7) guide de lumière. Dans ce châssis (9), la distance (H) comprise entre les faces de montage (9b1) des cartes de circuit imprimé à DEL et les parties de support (9c) est réglée à une valeur se situant dans une plage prescrite.
PCT/JP2011/060879 2010-08-24 2011-05-11 Dispositif d'éclairage, dispositif d'affichage et dispositif de téléviseur WO2012026162A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010187136 2010-08-24
JP2010-187136 2010-08-24

Publications (1)

Publication Number Publication Date
WO2012026162A1 true WO2012026162A1 (fr) 2012-03-01

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WO (1) WO2012026162A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014019258A1 (fr) * 2012-08-02 2014-02-06 深圳市华星光电技术有限公司 Module de rétroéclairage de type latéral
US9022636B2 (en) 2012-08-02 2015-05-05 Shenzhen China Star Optoelectronics Technology Co., Ltd. Side-edge backlight module
JP2015092235A (ja) * 2013-10-04 2015-05-14 シャープ株式会社 液晶表示装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003346534A (ja) * 2002-05-24 2003-12-05 Advanced Display Inc 表示装置
JP2008305713A (ja) * 2007-06-08 2008-12-18 Fujifilm Corp 面状照明装置
WO2010004794A1 (fr) * 2008-07-10 2010-01-14 シャープ株式会社 Dispositif de rétroéclairage et dispositif d'affichage plat l'utilisant
JP2010072262A (ja) * 2008-09-18 2010-04-02 Hitachi Ltd 液晶表示装置
JP2010135220A (ja) * 2008-12-05 2010-06-17 Kuraray Co Ltd 面光源素子およびこれを用いた画像表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003346534A (ja) * 2002-05-24 2003-12-05 Advanced Display Inc 表示装置
JP2008305713A (ja) * 2007-06-08 2008-12-18 Fujifilm Corp 面状照明装置
WO2010004794A1 (fr) * 2008-07-10 2010-01-14 シャープ株式会社 Dispositif de rétroéclairage et dispositif d'affichage plat l'utilisant
JP2010072262A (ja) * 2008-09-18 2010-04-02 Hitachi Ltd 液晶表示装置
JP2010135220A (ja) * 2008-12-05 2010-06-17 Kuraray Co Ltd 面光源素子およびこれを用いた画像表示装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014019258A1 (fr) * 2012-08-02 2014-02-06 深圳市华星光电技术有限公司 Module de rétroéclairage de type latéral
US9022636B2 (en) 2012-08-02 2015-05-05 Shenzhen China Star Optoelectronics Technology Co., Ltd. Side-edge backlight module
JP2015092235A (ja) * 2013-10-04 2015-05-14 シャープ株式会社 液晶表示装置

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