WO2012026162A1 - Lighting apparatus, display apparatus, and television receiver apparatus - Google Patents

Lighting apparatus, display apparatus, and television receiver apparatus 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
Prior art date
Application number
PCT/JP2011/060879
Other languages
French (fr)
Japanese (ja)
Inventor
吉川貴博
Original Assignee
シャープ株式会社
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 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/en

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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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Abstract

Provided is a lighting apparatus (3) equipped with light-emitting diodes (light sources) (5), a light guiding plate (7), LED circuit boards (light source circuit boards) (6), and a chassis (heat dissipation member) (9), wherein the chassis (9) has formed thereon support sections (9c) that support the end sections of the light guiding plate (7). The chassis (9) also has the distance (H) from mounting faces (9b1) of the LED circuit boards to the support sections (9c) set to be a value within a prescribed range.

Description

照明装置、表示装置、及びテレビ受信装置Lighting device, display device, and television receiver
　本発明は、照明装置、特に導光板を使用した照明装置、及びこれを用いた表示装置、並びにテレビ受信装置に関する。 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.
　近年、例えば家庭用のテレビ受信装置では、液晶表示装置に代表されるように、在来のブラウン管に比べ薄型、軽量等の多くの特長を有するフラットな表示部としての液晶パネルを備えた表示装置が主流になりつつある。このような液晶表示装置には、光を発光する照明装置（バックライト）と、照明装置に設けられた光源からの光に対してシャッターの役割を果たすことで、所望画像を表示する液晶パネルとが設けられている。そして、テレビ受信装置では、テレビ放送の映像信号に含まれた文字、画像等の情報を液晶パネルの表示面上に表示するようになっている。 In recent years, for example, in a television receiver for home use, as represented by a liquid crystal display device, 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. Such 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. In the television receiver, 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.
　また、上記照明装置では、光の被照射物としての液晶パネルに対する光源の配置の仕方により直下型とエッジライト型に大別されるが、液晶表示装置では、昨今、直下型に比べ薄型化を図り易いエッジライト型が一般的に使用されている。すなわち、エッジライト型の照明装置では、光源を液晶パネルの側方に配置することにて薄型化が図られており、液晶パネルの非表示面に対向配置される発光面を備えた導光板を用いて光源からの光を当該液晶パネルに与えるようになっている。 In addition, 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.
　また、従来の照明装置には、例えば下記特許文献１に記載されているように、光源としての発光ダイオードが実装されたＦＰＣ（Flexible Printed Circuit；光源基板）と、熱伝導シートを介して上記ＦＰＣが取り付けられるとともに、放熱板を兼用する下シャーシが設けられている。また、この従来の照明装置では、ＦＰＣの実装面側に押さえ板を設けるとともに、当該押さえ板と下シャーシとで、ＦＰＣを狭持することが提案されている。そして、この従来の照明装置では、発光ダイオードからの熱をＦＰＣ及び下シャーシ（放熱板）を介して大気中に効率的に放熱することができ、発光ダイオードの発光効率の低下及び発光ダイオードの長寿命化を図ることが可能とされていた。 Further, in the conventional lighting device, for example, as described in Patent Document 1 below, the FPC (Flexible Printed Circuit; light source substrate) on which a light emitting diode as a light source is mounted, and the FPC via a heat conductive sheet is used. And a lower chassis that also serves as a heat sink. Further, in this conventional lighting device, it is proposed that 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. In this conventional lighting device, 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.
国際公開第２００８／０９０６４６号パンフレットInternational Publication No. 2008/090646 Pamphlet
　しかしながら、上記のような従来の照明装置では、発光ダイオード（光源）からの熱が導光板を介して当該発光ダイオードに伝わるのを抑制することができずに、その熱の悪影響が発光ダイオードに発生するのを防止できないおそれがあった。 However, in the conventional lighting device as described above, heat from the light emitting diode (light source) cannot be suppressed from being transmitted to the light emitting diode through the light guide plate, and the adverse effect of the heat is generated in the light emitting diode. There was a risk that it could not be prevented.
　具体的にいえば、従来の照明装置では、発光ダイオードからの光を入光するために、導光板が発光ダイオードに対向するように設けられていた。また、この導光板では、その端部が下シャーシ（放熱部材）の開口を塞ぐように設けられた裏板金上に取り付けられていた。このため、この従来の照明装置では、発光ダイオードからの熱がＦＰＣ（光源基板）、下シャーシ、裏板金、及び導光板を介して、発光ダイオードに伝えられて、当該発光ダイオードに悪影響を及ぼすおそれがあった。すなわち、従来の照明装置では、発光ダイオードからの熱がＦＰＣ、下シャーシ、裏板金、及び導光板を順次熱伝導して、発光ダイオード自体に輻射され、当該発光ダイオードにおいて、その発光効率の低下やその寿命の低下などの悪影響を発生させるおそれがあった。 Specifically, in the conventional lighting device, the light guide plate is provided to face the light emitting diode in order to receive light from the light emitting diode. Moreover, in this light guide plate, 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. For this reason, in this conventional lighting device, 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. That is, in the conventional lighting device, 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. There was a risk of adverse effects such as a reduction in the service life.
　上記の課題を鑑み、本発明は、光源からの熱が導光板を介して当該光源に伝わるのを抑制することができ、熱の悪影響が光源に発生するのを防止することができる照明装置、及びこれを用いた表示装置、並びにテレビ受信装置を提供することを目的とする。 In view of the above problems, 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.
　上記の目的を達成するために、本発明にかかる照明装置は、光源と、前記光源からの光を所定の伝搬方向に導くとともに、被照射物に当該光を出射する導光板と、前記光源が実装された光源基板と、前記光源基板が取り付けられるとともに、前記光源からの熱を放熱する放熱部材を備えた照明装置であって、
　前記放熱部材には、前記導光板の端部を支持する支持部が設けられ、かつ、
　前記放熱部材では、前記光源基板の取付面から前記支持部までの距離が、所定の範囲内の値に設定されていることを特徴とするものである。 In order to achieve the above object, an illumination device according to the present invention 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.
　上記のように構成された照明装置では、光源からの熱を放熱する放熱部材に、導光板の端部を支持する支持部が設けられている。また、この放熱部材では、上記光源基板の取付面から支持部までの距離が、所定の範囲内の値に設定されている。これにより、導光板と光源との位置ずれが生じるのを防ぎつつ、光源から光源基板、放熱部材、支持部、及び導光板を通る、光源からの熱の伝導経路を長くすることができる。この結果、上記従来例と異なり、光源からの熱が導光板を介して当該光源に伝わるのを抑制することができ、熱の悪影響が光源に発生するのを防止することができる。 In the lighting device configured as described above, 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. In this 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. 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. As a result, unlike the conventional example, 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.
　また、上記照明装置において、前記光源と、前記導光板と、前記光源基板と、前記放熱部材を収容する筐体を備えるとともに、
　前記放熱部材は、前記光源からの熱が放熱されるように、前記筐体に取り付けられてもよい。 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.
　この場合、照明装置の組立作業性を向上させつつ、筐体からも光源からの熱を放熱させることができることから、光源からの熱を効率よく放熱させることが可能となる。 In this case, since 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.
　また、上記照明装置において、前記光源と、前記導光板と、前記光源基板と、前記放熱部材を収容する筐体を備えるとともに、
　前記放熱部材と前記筐体とは、一体的に構成されてもよい。 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.
　この場合、照明装置の部品点数を削減することができる。 In this case, the number of parts of the lighting device can be reduced.
　また、上記照明装置において、前記支持部として、前記放熱部材と別個に構成された支持部材が用いられてもよい。 Further, in the lighting device, a support member configured separately from the heat dissipation member may be used as the support portion.
　この場合、導光板の端部をより適切に、かつ、より容易に支持することができる。 In this case, the end of the light guide plate can be supported more appropriately and more easily.
　また、上記照明装置において、前記支持部材には、前記放熱部材よりも熱伝導率の低いものが用いられていることが好ましい。 In the lighting device, it is preferable that the support member has a lower thermal conductivity than the heat dissipation member.
　この場合、導光板への光源からの熱の伝搬をより抑制することができ、熱の悪影響が光源に発生するのをより確実に防止することができる。 In this case, 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.
　また、上記照明装置において、前記距離の値は、前記光源の発熱量を用いて、設定されていることが好ましい。 In the lighting device, it is preferable that the value of the distance is set by using a calorific value of the light source.
　この場合、上記距離の値をより適切に設定することができ、熱の悪影響が光源に発生するのをより確実に防止することができる。 In this case, the distance value can be set more appropriately, and the adverse effect of heat on the light source can be more reliably prevented.
　また、上記照明装置において、前記距離の値は、前記導光板の重さ及び材質の少なくとも一方を用いて、設定されていることが好ましい。 Further, in the lighting device, it is preferable that the distance value is set using at least one of a weight and a material of the light guide plate.
　この場合、導光板の端部が支持部に対して垂れ下がるなどの変形が生じるのを確実に防止することができ、導光板と光源との位置ずれをより確実に防ぐことが可能となる。 In this case, it is possible to reliably prevent deformation such as the end portion of the light guide plate hanging down with respect to the support portion, and it is possible to more reliably prevent the positional deviation between the light guide plate and the light source.
　また、上記照明装置において、前記光源として、発光ダイオードが用いられていることが好ましい。 In the lighting device, it is preferable that a light emitting diode is used as the light source.
　この場合、消費電力が少なく、優れた環境性をもつ照明装置を容易に構成することができる。 In this case, it is possible to easily configure a lighting device with low power consumption and excellent environmental characteristics.
　また、本発明の表示装置は、上記いずれかの照明装置を用いたことを特徴とするものである。 The display device of the present invention is characterized by using any one of the above lighting devices.
　また、本発明のテレビ受信装置では、上記表示装置を用いたことを特徴とするものである。 Also, the television receiver of the present invention is characterized by using the above display device.
　上記のように構成された表示装置及びテレビ受信装置では、光源からの熱が導光板を介して当該光源に伝わるのを抑制することができ、熱の悪影響が光源に発生するのを防止することができる照明装置が用いられているので、長寿命で高性能な表示装置及びテレビ受信装置を容易に構成することができる。 In the display device and the television receiver configured as described above, 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.
　本発明によれば、光源からの熱が導光板を介して当該光源に伝わるのを抑制することができ、熱の悪影響が光源に発生するのを防止することができる照明装置、及びこれを用いた表示装置、並びにテレビ受信装置を提供することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can suppress that the heat | fever from a light source is transmitted to the said light source through a light-guide plate, and can prevent that the bad influence of a heat | fever generate | occur | produces in a light source, and this are used. It is possible to provide a conventional display device and a television receiver.
図１は、本発明の第１の実施形態にかかるテレビ受信装置及び液晶表示装置を説明する分解斜視図である。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. 図２は、上記液晶表示装置の要部構成を説明する図である。FIG. 2 is a diagram for explaining a main configuration of the liquid crystal display device. 図３は、図２に示した液晶パネルの構成を説明する図である。FIG. 3 is a diagram for explaining the configuration of the liquid crystal panel shown in FIG. 図４は、図２に示した照明装置を示す平面図である。FIG. 4 is a plan view showing the lighting device shown in FIG. 図５は、上記照明装置の要部構成を示す拡大図である。FIG. 5 is an enlarged view showing a main configuration of the lighting device. 図６は、図５に示した距離と図２に示したＬＥＤ基板上の温度との関係を示すシミュレーション結果のグラフである。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. 図７は、本発明の第２の実施形態にかかる液晶表示装置の要部構成を説明する図である。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. 図８は、図７に示した照明装置の要部構成を示す拡大図である。FIG. 8 is an enlarged view showing a main configuration of the illumination device shown in FIG. 図９は、本発明の第３の実施形態にかかる液晶表示装置の要部構成を説明する図である。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. 図１０は、図９に示した照明装置を示す平面図である。FIG. 10 is a plan view showing the lighting device shown in FIG. 図１１は、図１０に示した照明装置の要部構成を示す拡大図である。FIG. 11 is an enlarged view showing a main configuration of the illumination device shown in FIG. 図１２は、本発明の第４の実施形態にかかる液晶表示装置に含まれた照明装置の要部構成を示す拡大図である。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.
　以下、本発明の照明装置、表示装置、及びテレビ受信装置の好ましい実施形態について、図面を参照しながら説明する。なお、以下の説明では、本発明を透過型の液晶表示装置に適用した場合を例示して説明する。また、各図中の構成部材の寸法は、実際の構成部材の寸法及び各構成部材の寸法比率等を忠実に表したものではない。 Hereinafter, preferred embodiments of the illumination device, the display device, and the television receiver of the present invention will be described with reference to the drawings. In the following description, the case where the present invention is applied to a transmissive liquid crystal display device will be described as an example. Moreover, 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.
　［第１の実施形態］
　図１は、本発明の第１の実施形態にかかるテレビ受信装置及び液晶表示装置を説明する分解斜視図である。図において、本実施形態のテレビ受信装置Ｔｖは、表示装置としての液晶表示装置１を備えており、アンテナやケーブル（図示せず）などによりテレビ放送を受信可能に構成されている。液晶表示装置１は、表キャビネットＣａ及び裏キャビネットＣｂに収納された状態で、スタンドＤによって立設されるようになっている。また、テレビ受信装置Ｔｖでは、液晶表示装置１の表示面１ａが表キャビネットＣａを介在させて視認可能に構成されている。この表示面１ａは、スタンドＤにより、重力の作用方向（鉛直方向）に平行となるように設置されている。 [First Embodiment]
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. In the figure, 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. In the television receiver Tv, 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).
　また、テレビ受信装置Ｔｖでは、図示を省略したＴＶチューナー部で受信されたテレビ放送の映像信号に応じた画像が表示面１ａ上に表示されるとともに、表キャビネットＣａに設けられたスピーカＣａ１から音声が再生出力される。なお、裏キャビネットＣｂには、多数の通気孔が形成されており、照明装置や電源等で発生した熱を適切に放熱できるようになっている。 Further, in 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.
　続いて、図２を参照して、本実施形態の液晶表示装置１について具体的に説明する。 Subsequently, the liquid crystal display device 1 of the present embodiment will be specifically described with reference to FIG.
　図２は、上記液晶表示装置の要部構成を説明する図である。 FIG. 2 is a diagram for explaining a main configuration of the liquid crystal display device.
　図２において、本実施形態の液晶表示装置１は、図２の上側が視認側（表示面側）として設置される液晶パネル２と、液晶パネル２の非表示面側（図２の下側）に配置されて、当該液晶パネル２を照明する照明光を発生する本発明の照明装置３とが設けられている。また、液晶表示装置１では、断面Ｌ字状のベゼル４の内部で、液晶パネル２と照明装置３とが互いに組み付けられており、当該照明装置３からの照明光が液晶パネル２に入射される透過型の液晶表示装置１として一体化されている。 2, 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. In the liquid crystal display device 1, 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.
　また、液晶表示装置１では、ベゼル４に設けられた矩形状の開口部４ａによって上記表示面１ａが規定されている。すなわち、液晶表示装置１では、開口部４ａを通して視認される、液晶パネル２の表示面が表示面１ａを構成している。 In the liquid crystal display device 1, 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.
　また、液晶パネル２には、液晶層と、この液晶層を狭持する一対の基板としてのカラーフィルタ基板及びアクティブマトリクス基板と、これらカラーフィルタ基板及びアクティブマトリクス基板の各外側表面にそれぞれ設置された偏光板とが設けられている（図示せず。）。そして、液晶パネル２では、液晶層によって照明装置３側の偏光板を介して入射された上記照明光の偏光状態が変調され、かつ、開口部４ａ側（表示面１ａ側）の偏光板を通過する光量が制御されることにより、所望画像が表示される。 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). In the liquid crystal panel 2, 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.
　次に、図３も参照して、本実施形態の液晶パネル２について具体的に説明する。 Next, the liquid crystal panel 2 of the present embodiment will be specifically described with reference to FIG.
　図３は、図２に示した液晶パネルの構成を説明する図である。 FIG. 3 is a diagram for explaining the configuration of the liquid crystal panel shown in FIG.
　図３において、液晶表示装置１（図２）には、文字や画像等の情報を表示する表示部としての液晶パネル２（図２）の駆動制御を行うパネル制御部１２と、このパネル制御部１２からの指示信号を基に動作するソースドライバ１３及びゲートドライバ１４が設けられている。 3, the liquid crystal display device 1 (FIG. 2) 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.
　パネル制御部１２は、液晶表示装置１に設けられた制御装置（図示せず）内に設けられたものであり、液晶表示装置１の外部からの映像信号が入力されるようになっている。また、パネル制御部１２は、入力された映像信号に対して所定の画像処理を行ってソースドライバ１３及びゲートドライバ１４への各指示信号を生成する画像処理部１２ａと、入力された映像信号に含まれた１フレーム分の表示データを記憶可能なフレームバッファ１２ｂとを備えている。そして、パネル制御部１２が、入力された映像信号に応じて、ソースドライバ１３及びゲートドライバ１４の駆動制御を行うことにより、その映像信号に応じた情報が液晶パネル２に表示される。 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.
　ソースドライバ１３及びゲートドライバ１４は、例えば上記アクティブマトリクス基板上に設置されている。具体的には、ソースドライバ１３は、アクティブマトリクス基板の表面上において、表示パネルとしての液晶パネル２の有効表示領域Ａの外側領域で当該液晶パネル２の横方向に沿うように設置されている。また、ゲートドライバ１４は、アクティブマトリクス基板の表面上において、上記有効表示領域Ａの外側領域で当該液晶パネル２の縦方向に沿うように設置されている。 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.
　また、ソースドライバ１３及びゲートドライバ１４は、液晶パネル２側に設けられた複数の画素Ｐを画素単位に駆動する駆動回路であり、ソースドライバ１３及びゲートドライバ１４には、複数のソース配線Ｓ１～ＳＭ（Ｍは、２以上の整数、以下、“Ｓ”にて総称する。）及び複数のゲート配線Ｇ１～ＧＮ（Ｎは、２以上の整数、以下、“Ｇ”にて総称する。）がそれぞれ接続されている。これらのソース配線Ｓ及びゲート配線Ｇは、それぞれデータ配線及び走査配線を構成しており、アクティブマトリクス基板に含まれた透明なガラス材または透明な合成樹脂製の基材（図示せず）上で互いに交差するように、マトリクス状に配列されている。すなわち、ソース配線Ｓは、マトリクス状の列方向（液晶パネル２の縦方向）に平行となるように上記基材上に設けられ、ゲート配線Ｇは、マトリクス状の行方向（液晶パネル２の横方向）に平行となるように上記基材上に設けられている。 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 (M is an integer of 2 or more, hereinafter collectively referred to as “S”) and a plurality of gate wirings G1 to GN (N is an integer of 2 or more, hereinafter collectively referred to as “G”). Each is connected. These source wiring S and gate wiring 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. That is, 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).
　また、これらのソース配線Ｓと、ゲート配線Ｇとの交差部の近傍には、スイッチング素子としての上記薄膜トランジスタ１５と、薄膜トランジスタ１５に接続された画素電極１６を有する上記画素Ｐが設けられている。また、各画素Ｐでは、共通電極１７が液晶パネル２に設けられた上記液晶層を間に挟んだ状態で画素電極１６に対向するよう構成されている。つまり、アクティブマトリクス基板では、薄膜トランジスタ１５、画素電極１６、及び共通電極１７が画素単位に設けられている。 Further, in the vicinity of the intersection between the source line S and the gate line G, 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. In each pixel P, 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.
　また、上記アクティブマトリクス基板では、ソース配線Ｓと、ゲート配線Ｇとによってマトリクス状に区画された各領域に、複数の各画素Ｐの領域が形成されている。これら複数の画素Ｐには、赤色（Ｒ）、緑色（Ｇ）、及び青色（Ｂ）の画素が含まれている。また、これらのＲＧＢの画素は、例えばこの順番で、各ゲート配線Ｇ１～ＧＮに平行に順次配設されている。さらに、これらのＲＧＢの画素は、上記カラーフィルタ基板側に設けられたカラーフィルタ層（図示せず）により、対応する色の表示を行えるようになっている。 In the active matrix substrate, 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.
　また、上記アクティブマトリクス基板では、ゲートドライバ１４は、画像処理部１２ａからの指示信号に基づいて、ゲート配線Ｇ１～ＧＮに対して、対応する薄膜トランジスタ１５のゲート電極をオン状態にする走査信号（ゲート信号）を順次出力する。また、ソースドライバ１３は、画像処理部１２ａからの指示信号に基づいて、表示画像の輝度（階調）に応じたデータ信号（電圧信号（階調電圧））を対応するソース配線Ｓ１～ＳＭに出力する。 In the active matrix substrate, 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.
　続いて、図２及び図４を用いて、本実施形態の照明装置３について具体的に説明する。 Subsequently, the lighting device 3 of the present embodiment will be specifically described with reference to FIGS. 2 and 4.
　図４は、図２に示した照明装置を示す平面図である。 FIG. 4 is a plan view showing the illumination device shown in FIG.
　図２及び図４に示すように、本実施形態の照明装置３には、光源としての発光ダイオード５と、発光ダイオード５が実装された光源基板としてのＬＥＤ基板６と、発光ダイオード５からの光が入光される導光板７とが設けられている。発光ダイオード５には、例えば白色光を発光する白色（Ｗ）の発光ダイオードが用いられている。また、本実施形態の照明装置３では、図４に例示するように、２つのＬＥＤ基板６が用いられており、各ＬＥＤ基板６には、直線状に配列された複数、例えば８個の発光ダイオード５が互いに所定の間隔をおいて実装されている。 As shown in FIGS. 2 and 4, 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. As the light emitting diode 5, for example, a white (W) light emitting diode that emits white light is used. Moreover, in the illuminating device 3 of this embodiment, as illustrated in FIG. 4, 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.
　導光板７には、例えば厚さ１．５ｍｍ～４．０ｍｍ程度で、透明なアクリル樹脂などの合成樹脂または透明なガラス材が用いられており、発光ダイオード（光源）５からの光が入光される。つまり、導光板７では、互いに対向する２つの側面が各々発光ダイオード５からの光を入光する入光面として機能するようになっている。また、導光板７の液晶パネル２と反対側（対向面側）には、例えば反射シート８が設置されている。そして、この導光板７は、発光ダイオード５からの光を所定の伝搬方向（図２の左右方向）に導きつつ、液晶パネル２に対向する発光面から、被照射物としての液晶パネル（被照射物）２に光を出射するようになっている。さらに、導光板７の液晶パネル２側（発光面側）には、レンズシートや拡散シートなどの光学シート１１が設けられており、導光板７の内部を上記伝搬方向に導かれた発光ダイオード５からの光が均一な輝度をもつ平面状の上記照明光に変えられて液晶パネル２に与えられる。 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. 2), and from the light emitting surface facing the liquid crystal panel 2, a liquid crystal panel (irradiated object). The light is emitted to the object 2. Further, 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.
　また、本実施形態の照明装置３には、図２に示すように、液晶パネル２側が開口した有底状のシャーシ９と、矩形状の開口部が設けられるとともに、シャーシ９の縁部に取り付けられるＰ（プラスチック）シャーシ１０とが設けられている。シャーシ９には、例えば亜鉛メッキ鋼板などの金属材料が用いられており、シャーシ９は、平板状の底部９ａと、この底部９ａの４辺で当該底部９ａに対して立設された側面部９ｂを備えている。Ｐシャーシ１０の開口部には、上記光学シート１１が配置されており、導光板７の発光面からの光に対して輝度上昇などを行って、液晶パネル２に入射させるようになっている。 Further, as shown in FIG. 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. For example, 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.
　また、シャーシ９は、発光ダイオード（光源）５と、導光板７と、ＬＥＤ基板（光源基板）６と、発光ダイオード５からの熱を放熱する放熱部材とを収容する筐体を構成している。さらに、シャーシ９は、上記放熱部材と一体的に構成されている。すなわち、シャーシ９では、図２及び図４に示すように、その側面部９ｂの取付面９ｂ１にＬＥＤ基板６が取り付けられており、発光ダイオード５からの熱がＬＥＤ基板６を介して伝えられ、その伝えられた熱を側面部９ｂ及び底部９ａで放熱するように構成されている。 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.
　また、シャーシ９では、導光板７の端部を支持する支持部９ｃが底部９ａの底面９ａ１に設けられている。具体的には、図４の点線にて示すように、シャーシ９では、支持部９ｃが導光板７の長辺側の端部を底部９ａ側から支持するようになっている。これにより、本実施形態の照明装置３では、導光板７と発光ダイオード５との位置ずれが生じるのを防ぐことができ、導光板７の上記入光面に対して、発光ダイオード５からの光を効率よく入光させることができるようになっている。さらに、シャーシ９では、取付面９ｂ１と支持部９ｃとの間の距離が所定の範囲内の適切な値に設定されており、発光ダイオード５で生じた熱が導光板７を介して当該発光ダイオード５に輻射されるのを極力抑制することができるように構成されている。 Further, in the chassis 9, 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. Thereby, in the illuminating device 3 of this embodiment, it can prevent that the position shift of the light-guide plate 7 and the light emitting diode 5 arises, and the light from the light-emitting diode 5 with respect to the upper writing light surface of the light-guide plate 7 is prevented. Can be efficiently incident. Further, in the chassis 9, 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.
　次に、図５も用いて、本実施形態の照明装置３の要部構成について具体的に説明する。 Next, the configuration of the main part of the illumination device 3 of the present embodiment will be specifically described with reference to FIG.
　図５は、上記照明装置の要部構成を示す拡大図である。 FIG. 5 is an enlarged view showing a main configuration of the lighting device.
　図５において、本実施形態の照明装置３では、シャーシ９のＬＥＤ基板６の取付面９ｂ１から導光板７の端部を支持する支持部９ｃまでの距離Ｈが、所定の距離の範囲、例えば２０ｍｍ～１００ｍｍの範囲内の値に設定されている。具体的には、この距離Ｈの値は、発光ダイオード５の発熱量を用いて設定されており、発光ダイオード５からの熱が導光板７を介して発光ダイオード５に伝えられるのを確実に抑えられるようになっている。さらに、距離Ｈの値は、導光板７の重さ及び材質の少なくとも一方を用いて設定されており、導光板７の端部が支持部９ｃに対して垂れ下がるなどの変形が生じるのを確実に防止することができるようになっている。 In FIG. 5, in the lighting device 3 of the present embodiment, 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. Specifically, 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. Further, 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.
　以上のように構成された本実施形態の照明装置３では、発光ダイオード（光源）５からの熱を放熱するシャーシ（放熱部材）９に、導光板７の端部を支持する支持部９ｃが設けられている。また、このシャーシ９では、ＬＥＤ基板（光源基板）６の取付面９ｂ１から支持部９ｃまでの距離Ｈが、所定の範囲内の値に設定されている。これにより、本実施形態の照明装置３では、導光板７と発光ダイオード５との位置ずれが生じるのを防ぎつつ、発光ダイオード５からＬＥＤ基板６、シャーシ９の側面部９ｂ、底部９ａ、支持部９ｃ、及び導光板７を通る、発光ダイオード５からの熱の伝導経路を長くすることができる。この結果、本実施形態の照明装置３では、上記従来例と異なり、発光ダイオード５からの熱が導光板７を介して当該発光ダイオード５に伝わるのを抑制することができ、発光ダイオード５において、その発光効率の低下やその寿命の低下などの熱の悪影響が発生するのを防止することができる。 In the illumination device 3 of the present embodiment configured as described above, 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. As a result, in the illumination device 3 of the present embodiment, unlike the conventional example, 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.
　ここで、図６を参照して、距離Ｈの値を上記所定の範囲内の値に設定したことによる効果について具体的に説明する。 Here, with reference to FIG. 6, the effect by setting the value of the distance H to a value within the predetermined range will be specifically described.
　図６は、図５に示した距離と図２に示したＬＥＤ基板上の温度との関係を示すシミュレーション結果のグラフである。 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.
　本願発明の発明者は、発光ダイオード５を点灯駆動させた場合において、シミュレーションを行うことにより、上記距離Ｈの値を変化させたときでのＬＥＤ基板６表面での温度を求めた。この結果、図６のグラフ７０に例示するように、距離Ｈの値を２０ｍｍ以上とすることにより、ＬＥＤ基板６表面での温度が大きく低下することが確かめられた。つまり、距離Ｈの値を２０ｍｍ以上とすることにより、発光ダイオード５からの熱が導光板７を介して当該発光ダイオード５に伝わるのを抑制することができ、発光ダイオード５に対して、熱による上記悪影響が生じていないことが実証された。 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.
　一方、距離Ｈの値を２０ｍｍ未満の値とした場合、ＬＥＤ基板６表面での温度を大きく低下させることができずに、発光ダイオード５からの熱が導光板７を介して当該発光ダイオード５に伝わるのを抑制するのが困難なものとなった。 On the other hand, when the value of the distance H is less than 20 mm, the temperature on the surface of the LED substrate 6 cannot be greatly reduced, and the heat from the light emitting diode 5 passes through the light guide plate 7 to the light emitting diode 5. It became difficult to suppress transmission.
　また、距離Ｈの値を１００ｍｍを超過する値とした場合、支持部９ｃによって導光板７の端部を適切に支持することが難しくなって、導光板７と発光ダイオード５との位置ずれが生じるのを防ぐことも困難なものとなった。 Moreover, when 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.
　また、本実施形態の照明装置３では、上記放熱部材とシャーシ（筐体）９とが一体的に構成されているので、照明装置３の部品点数を削減することができる。 Further, in the lighting device 3 of the present embodiment, since the heat dissipation member and the chassis (housing) 9 are integrally configured, the number of parts of the lighting device 3 can be reduced.
　また、本実施形態の照明装置３では、距離Ｈの値は、発光ダイオード５の発熱量を用いて設定されているので、距離Ｈの値をより適切に設定することができ、熱の悪影響が発光ダイオード５に発生するのをより確実に防止することができる。 Moreover, in the illuminating device 3 of this embodiment, since 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. FIG.
　また、本実施形態の照明装置３では、距離Ｈの値は、導光板７の重さ及び材質の少なくとも一方を用いて設定されているので、導光板７の端部が支持部９ｃに対して垂れ下がるなどの変形が生じるのを確実に防止することができ、導光板７と発光ダイオード５との位置ずれをより確実に防ぐことが可能となる。 Moreover, in the illuminating device 3 of this embodiment, since the value of the distance H is set using at least one of the weight and material of the light guide plate 7, 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.
　また、本実施形態では、発光ダイオード５からの熱が導光板７を介して当該発光ダイオード５に伝わるのを抑制することができ、熱の悪影響が発光ダイオード５に発生するのを防止することができる照明装置３が用いられているので、長寿命で高性能な液晶表示装置（表示装置）１及びテレビ受信装置Ｔｖを容易に構成することができる。 Moreover, in this embodiment, it can suppress that the heat from the light emitting diode 5 is transmitted to the said light emitting diode 5 through the light guide plate 7, and can prevent that the bad influence of heat generate | occur | produces in the light emitting diode 5. Since 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.
　［第２の実施形態］
　図７は、本発明の第２の実施形態にかかる液晶表示装置の要部構成を説明する図である。図８は、図７に示した照明装置の要部構成を示す拡大図である。図において、本実施形態と上記第１の実施形態との主な相違点は、シャーシ（筐体）において、ＬＥＤ基板（光源基板）が取り付けられるとともに、矩形状の開口部を有する側面部と、この側面部の開口部を塞ぐ底部とを設けた点である。なお、上記第１の実施形態と共通する要素については、同じ符号を付して、その重複した説明を省略する。 [Second Embodiment]
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. In the figure, 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. In addition, about the element which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.
　つまり、図７に示すように、本実施形態の照明装置３のシャーシ１９は、上記筐体を構成するものであり、矩形状の開口部を有する側面部１９ｂと、この側面部１９ｂの開口部を塞ぐ底部１９ａを備えている。また、シャーシ１９は、第１の実施形態のものと同様に、上記放熱部材を兼用している。すなわち、シャーシ１９では、側面部１９ｂの取付面１９ｂ１にＬＥＤ基板（光源基板）６が取り付けられている。 That is, as shown in FIG. 7, the chassis 19 of the lighting device 3 according to the present embodiment 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.
　さらに、シャーシ１９では、その底部１９ａには、例えば亜鉛メッキ鋼板などの金属材料が用いられている。また、側面部１９ｂには、例えばアルミニウムなどの放熱性に優れた金属材料が用いられており、第１の実施形態のものと比べて、発光ダイオード５からの熱を効率よく放熱できるように構成されている。 Furthermore, in the chassis 19, a metal material such as a galvanized steel plate is used for the bottom portion 19a. Further, 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.
　また、シャーシ１９では、第１の実施形態のものと同様に、導光板７の端部を支持する支持部１９ｃが底部１９ａの底面１９ａ１に設けられている。また、シャーシ１９では、図８に例示するように、ＬＥＤ基板６の取付面１９ｂ１から導光板７の端部を支持する支持部１９ｃまでの距離Ｈが、所定の距離の範囲、例えば２０ｍｍ～１００ｍｍの範囲内の値に設定されている。さらに、シャーシ１９では、第１の実施形態のものと同様に、距離Ｈの値は、発光ダイオード５の発熱量と、導光板７の重さ及び材質の少なくとも一方とを用いて設定されている。 Further, in the chassis 19, as in the first embodiment, 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. In the chassis 19, as illustrated in FIG. 8, 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. .
　以上の構成により、本実施形態では、上記第１の実施形態と同様な作用・効果を奏することができる。 With the above configuration, the present embodiment can achieve the same operations and effects as the first embodiment.
　［第３の実施形態］
　図９は、本発明の第３の実施形態にかかる液晶表示装置の要部構成を説明する図である。図１０は、図９に示した照明装置を示す平面図である。図１１は、図１０に示した照明装置の要部構成を示す拡大図である。図において、本実施形態と上記第１の実施形態との主な相違点は、シャーシ（筐体）と別体に構成されたヒートスプレッダ（放熱部材）を用いるとともに、発光ダイオードからの熱が放熱されるように、ヒートスプレッダをシャーシに取り付けた点である。なお、上記第１の実施形態と共通する要素については、同じ符号を付して、その重複した説明を省略する。 [Third 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. In the figure, 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. In addition, about the element which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.
　すなわち、図９に示すように、本実施形態の照明装置３では、上記筐体としてのシャーシ２９と、このシャーシ２９と別体に構成された放熱部材としてのヒートスプレッダ２８とが設けられている。シャーシ２９には、例えば亜鉛メッキ鋼板などの金属材料が用いられており、シャーシ２９は、平板状の底部２９ａと、この底部２９ａの４辺で当該底部２９ａに対して立設された側面部２９ｂを備えている。 That is, as shown in FIG. 9, in the lighting device 3 of the present embodiment, a chassis 29 as the casing and a heat spreader 28 as a heat radiating member configured separately from the chassis 29 are provided. For example, 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.
　また、ヒートスプレッダ２８には、例えばアルミニウムなどの放熱性に優れた金属材料が用いられており、ヒートスプレッダ２８は、図１０も参照して、互いに直交するように設けられた側面部２８ａ及び底部２８ｂを有する、断面Ｌ字状の形状に構成されている。また、ヒートスプレッダ２８では、その側面部２８ａの取付面２８ａ１に、ＬＥＤ基板（光源基板）６が取り付けられている。さらに、ヒートスプレッダ２８は、発光ダイオード５からの熱が放熱されるように、シャーシ２９に取り付けられている。つまり、ヒートスプレッダ２８では、側面部２８ａがシャーシ２９の側面部２９ｂの取付面２９ｂ１に取り付けられ、底部２８ｂがシャーシ２９の底部２９ａの底面２９ａ１に取り付けられている。 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. In the heat spreader 28, the LED substrate (light source substrate) 6 is attached to the attachment surface 28a1 of the side surface portion 28a. Furthermore, the heat spreader 28 is attached to the chassis 29 so that the heat from the light emitting diode 5 is dissipated. That is, in the heat spreader 28, 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.
　また、ヒートスプレッダ２８では、導光板７の端部を支持する支持部２８ｃが底部２８ｂの表面に設けられている。また、ヒートスプレッダ２８では、図１１に例示するように、ＬＥＤ基板６の取付面２８ａ１から導光板７の端部を支持する支持部２８ｃまでの距離Ｈが、所定の距離の範囲、例えば２０ｍｍ～１００ｍｍの範囲内の値に設定されている。さらに、ヒートスプレッダ２８では、距離Ｈの値は、発光ダイオード５の発熱量と、導光板７の重さ及び材質の少なくとも一方とを用いて設定されている。 In the heat spreader 28, 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. In the heat spreader 28, as illustrated in FIG. 11, 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.
　以上の構成により、本実施形態では、上記第１の実施形態と同様な作用・効果を奏することができる。また、本実施形態では、ＬＥＤ基板（光源基板）６に取り付けられるヒートスプレッダ（放熱部材）２８と、シャーシ２９（筐体）とを別個に構成しているので、照明装置３の組立作業性を向上させることができる。また、ヒートスプレッダ２８は、発光ダイオード５からの熱が放熱されるように、シャーシ２９に取り付けられているので、シャーシ２９からも発光ダイオード５からの熱を放熱させることができることから、発光ダイオード５からの熱を効率よく放熱させることが可能となる。 With the above configuration, 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.
　［第４の実施形態］
　図１２は、本発明の第４の実施形態にかかる液晶表示装置に含まれた照明装置の要部構成を示す拡大図である。図において、本実施形態と上記第１の実施形態との主な相違点は、支持部として、シャーシ（放熱部材）と別個に構成された支持部材を用いた点である。なお、上記第１の実施形態と共通する要素については、同じ符号を付して、その重複した説明を省略する。 [Fourth Embodiment]
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. In the figure, 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. In addition, about the element which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.
　すなわち、図１２に示すように、本実施形態の照明装置３では、シャーシ（放熱部材）９に対して、別個に構成された支持部材３９が用いられている。この支持部材３９は、支持部を構成するものであり、シャーシ９の底部９ａの底面９ａ１に固定されている。また、この支持部材３９には、シャーシ９よりも熱伝導率が低いもの、例えばポリカーボネート樹脂やアクリル樹脂などの合成樹脂が用いられている。 That is, as shown in FIG. 12, in the lighting device 3 of this embodiment, 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.
　以上の構成により、本実施形態では、上記第１の実施形態と同様な作用・効果を奏することができる。また、本実施形態では、支持部として、シャーシ（放熱部材）９と別個に構成された支持部材３９が用いられているので、導光板７の端部をより適切に、かつ、より容易に支持することができる。また、本実施形態では、支持部材３９には、シャーシ９よりも熱伝導率の低いものが用いられているので、導光板７への発光ダイオード（光源）５からの熱の伝搬をより抑制することができ、熱の悪影響が発光ダイオード５に発生するのをより確実に防止することができる。 With the above configuration, 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.
　尚、上記の説明以外に、上記第２及び第３の実施形態においても、それぞれシャーシ（放熱部材）１９及びヒートスプレッダ（放熱部材）２８と別個に構成された支持部材３９を用いてもよい。 In addition to the above description, also in the second and third embodiments, a support member 39 configured separately from the chassis (heat radiating member) 19 and the heat spreader (heat radiating member) 28 may be used.
　尚、上記の実施形態はすべて例示であって制限的なものではない。本発明の技術的範囲は特許請求の範囲によって規定され、そこに記載された構成と均等の範囲内のすべての変更も本発明の技術的範囲に含まれる。 It should be noted that all of the above embodiments are illustrative and not restrictive. The technical scope of the present invention is defined by the claims, and all modifications within the scope equivalent to the configurations described therein are also included in the technical scope of the present invention.
　例えば、上記の説明では、本発明を透過型の液晶表示装置に適用した場合について説明したが、本発明の照明装置はこれに限定されるものではなく、半透過型の液晶表示装置、あるいは液晶パネルをライトバルブに用いた投写型表示装置などの各種表示装置に適用することができる。 For example, in the above description, the case where the present invention is applied to a transmissive liquid crystal display device has been described. However, 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.
　また、上記の説明以外に、本発明は、レントゲン写真に光を照射するシャウカステンあるいは写真ネガ等に光を照射して視認をし易くするためのライトボックスや、看板や駅構内の壁面などに設置される広告等をライトアップする発光装置の照明装置として好適に用いることができる。 In addition to the above explanation, 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.
　また、上記の説明では、導光板の互いに対向する２つの側面に対して、各々直線状に配列された複数の発光ダイオード（光源）を対向して配置した場合について説明したが、本発明の照明装置は、光源と、光源からの光を所定の伝搬方向に導くとともに、被照射物に当該光を出射する導光板を備えたものであればよく、例えば導光板の１つの側面に光源を対向配置したものでもよい。また、導光板の１つの側面に対して、複数列の光源を対向配置したものでもよい。 Further, in the above description, the case where a plurality of light emitting diodes (light sources) arranged in a straight line is opposed to the two side surfaces facing each other of the light guide plate has been described. 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. For example, 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.
　また、上記の説明では、光源として白色の発光ダイオードを用いた場合について説明したが、本発明の光源はこれに限定されるものではなく、例えば冷陰極蛍光管や熱陰極蛍光管等の放電管、電球などのランプ、あるいは有機ＥＬ（Electronic Luminescence）や無機ＥＬ素子等の発光素子を光源に使用することもできる。 In the above description, a case where a white light emitting diode is used as the light source has been described. However, 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.
　但し、上記の各実施形態のように、光源に発光ダイオードを使用する場合の方が、消費電力が少なく、優れた環境性をもつ照明装置を容易に構成することができる点で好ましい。 However, it is preferable to use 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.
　また、本発明の発光ダイオードは上記白色の発光ダイオードに限定されるものではなく、例えばＲＧＢの発光ダイオードを一体化した、いわゆる３ｉｎ１タイプの発光ダイオードや、ＲＧＢＷや、ＧＲＧＢなど４つの発光ダイオードを一体化した、いわゆるフォーインワン（４ｉｎ１）タイプの発光ダイオードや、Ｒ、Ｇ、Ｂそれぞれ単色個別の発光ダイオードを用いることもできる。 The light-emitting diode of the present invention is not limited to the white light-emitting diode described above. For example, 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.
　本発明は、光源からの熱が導光板を介して当該光源に伝わるのを抑制することができ、熱の悪影響が光源に発生するのを防止することができる照明装置、及びこれを用いた表示装置、並びにテレビ受信装置に対して有用である。 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.
　１　液晶表示装置（表示装置）
　２　液晶パネル（被照射物）
　３　照明装置
　５　発光ダイオード（光源）
　６　ＬＥＤ基板（光源基板）
　７　導光板
　９、１９　シャーシ（放熱部材、筐体）
　９ｂ１、１９ｂ１　取付面
　９ｃ、１９ｃ　支持部
　２８　ヒートスプレッダ（放熱部材）
　２８ａ１　取付面
　２８ｃ　支持部
　２９　シャーシ（筐体）
　３９　支持部材（支持部）
　Ｔｖ　テレビ受信装置
　Ｈ　距離 1 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

Claims (10)

  1. 光源と、前記光源からの光を所定の伝搬方向に導くとともに、被照射物に当該光を出射する導光板と、前記光源が実装された光源基板と、前記光源基板が取り付けられるとともに、前記光源からの熱を放熱する放熱部材を備えた照明装置であって、
    　前記放熱部材には、前記導光板の端部を支持する支持部が設けられ、かつ、
    　前記放熱部材では、前記光源基板の取付面から前記支持部までの距離が、所定の範囲内の値に設定されている、
    　ことを特徴とする照明装置。     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 irradiated object, a light source substrate on which the light source is mounted, and the light source substrate are attached, and the light source A lighting device including a heat dissipating member that dissipates heat from
    The heat dissipation member is provided with a support portion that supports an end portion of the light guide plate, and
    In the heat dissipation 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 lighting device characterized by that.
  2. 前記光源と、前記導光板と、前記光源基板と、前記放熱部材を収容する筐体を備えるとともに、
    　前記放熱部材は、前記光源からの熱が放熱されるように、前記筐体に取り付けられている請求項１に記載の照明装置。     While comprising a housing for housing the light source, the light guide plate, the light source substrate, and the heat dissipation member,
    The lighting device according to claim 1, wherein the heat dissipating member is attached to the housing so that heat from the light source is dissipated.
  3. 前記光源と、前記導光板と、前記光源基板と、前記放熱部材を収容する筐体を備えるとともに、
    　前記放熱部材と前記筐体とは、一体的に構成されている請求項１に記載の照明装置。     While comprising a housing for housing the light source, the light guide plate, the light source substrate, and the heat dissipation member,
    The lighting device according to claim 1, wherein the heat radiating member and the housing are integrally formed.
  4. 前記支持部として、前記放熱部材と別個に構成された支持部材が用いられている請求項１～３のいずれか１項に記載の照明装置。 The illumination device according to any one of claims 1 to 3, wherein a support member configured separately from the heat dissipation member is used as the support portion.
  5. 前記支持部材には、前記放熱部材よりも熱伝導率の低いものが用いられている請求項４に記載の照明装置。 The lighting device according to claim 4, wherein the support member has a lower thermal conductivity than the heat dissipation member.
  6. 前記距離の値は、前記光源の発熱量を用いて、設定されている請求項１～５のいずれか１項に記載の照明装置。 The lighting device according to any one of claims 1 to 5, wherein the distance value is set using a calorific value of the light source.
  7. 前記距離の値は、前記導光板の重さ及び材質の少なくとも一方を用いて、設定されている請求項６に記載の照明装置。 The lighting device according to claim 6, wherein the distance value is set using at least one of a weight and a material of the light guide plate.
  8. 前記光源として、発光ダイオードが用いられている請求項１～７のいずれか１項に記載の照明装置。 The lighting device according to any one of claims 1 to 7, wherein a light emitting diode is used as the light source.
  9. 請求項１～８のいずれか１項に記載の照明装置を用いたことを特徴とする表示装置。 A display device using the illumination device according to any one of claims 1 to 8.
  10. 請求項９に記載の表示装置を備えることを特徴とするテレビ受信装置。 A television receiver comprising the display device according to claim 9.
PCT/JP2011/060879 2010-08-24 2011-05-11 Lighting apparatus, display apparatus, and television receiver apparatus WO2012026162A1 (en)

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US9022636B2 (en) 2012-08-02 2015-05-05 Shenzhen China Star Optoelectronics Technology Co., Ltd. Side-edge backlight module
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WO2014019258A1 (en) * 2012-08-02 2014-02-06 深圳市华星光电技术有限公司 Side type backlight module
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