WO2015186638A1 - Display device and television receiver device - Google Patents

Display device and television receiver device Download PDF

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Publication number
WO2015186638A1
WO2015186638A1 PCT/JP2015/065640 JP2015065640W WO2015186638A1 WO 2015186638 A1 WO2015186638 A1 WO 2015186638A1 JP 2015065640 W JP2015065640 W JP 2015065640W WO 2015186638 A1 WO2015186638 A1 WO 2015186638A1
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WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
display device
light
plate
Prior art date
Application number
PCT/JP2015/065640
Other languages
French (fr)
Japanese (ja)
Inventor
畔柳　均
満 竹島
崇 熊代
大樹 岩田
Original Assignee
シャープ株式会社
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Application filed by シャープ株式会社 filed Critical シャープ株式会社
Publication of WO2015186638A1 publication Critical patent/WO2015186638A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods

Definitions

  • the present invention relates to an edge light type display device and a television receiver including the display device.
  • a liquid crystal display device provided with a liquid crystal panel as a display panel is thin and lightweight and consumes little power. Therefore, in recent years, liquid crystal display devices have been widely adopted as image display devices for television receivers, computers, and portable terminals.
  • the liquid crystal display device includes a liquid crystal display panel that displays an image on the front side and a backlight that irradiates light on the rear side of the liquid crystal display panel.
  • a backlight that irradiates light on the rear side of the liquid crystal display panel.
  • Edge-type backlights that have been widely adopted in recent years have a reflective sheet, a light guide plate, and an optical sheet placed on top of a box-shaped holder that is open on one side, and light emission such as LEDs (Light Emitting Diodes) on one side.
  • the substrate on which the element is mounted is fixed so as to face one side surface of the light guide plate.
  • the frame-like middle chassis is fixed to the backlight chassis so as to cover the periphery of the light guide plate.
  • the liquid crystal display panel is placed so as to face the wide surface of the light guide plate of the backlight, and the front frame having a frame shape covers the periphery of the liquid crystal display panel, and the front frame is backed.
  • the reflection sheet, the light guide plate, the optical sheet, and the liquid crystal display panel are sandwiched and fixed by the front frame and the backlight chassis.
  • the liquid crystal display device has a problem that the internal members expand and contract depending on the environmental temperature. Since the expansion rate differs depending on the material of the member, a gap is generated between the members depending on the environmental temperature. As a result, rattling or misalignment may occur in the light guide plate.
  • Patent Document 1 discloses that a light guide plate having a pair of concave portions formed in a concave shape and a pair of elastic members arranged so as to contact the inner wall of the backlight chassis and capable of pressing the light guide plate.
  • the elastic member has at least a part that contacts the recess formed on the light guide plate and has a protrusion capable of pressing the recess, and the protrusion is formed to be located near the outside of the recess at room temperature.
  • a display device is described.
  • the recess extends from the end of the surface facing the LED substrate to the portion facing the LED.
  • the occurrence of unevenness of light due to the provision of the concave portions up to the portion facing the LED is not considered, and the configuration of Patent Document 1 cannot be adopted.
  • the design of the light guide plate is made smaller and close to the size of the display panel. Therefore, in the light guide plate, the peripheral area that can be used for clamping is reduced. Therefore, when the light guide plate is thermally contracted, the peripheral portion may not come into contact with the middle chassis and may fall off.
  • the present invention has been made in view of such circumstances, and it is an object of the present invention to provide a liquid crystal display device and the like that can prevent the light guide plate from being displaced during thermal expansion and can prevent the light guide plate from falling out during thermal contraction. .
  • the display device includes a display panel that displays an image on the front side, a rectangular plate shape, a light guide plate that is arranged with a wide surface facing the rear side of the display panel, and a light emitting element mounted on the one surface. And a plate-like portion parallel to one side surface of the light guide plate, and the substrate is fixed to the plate-like portion, and the mounting surface of the light-emitting element is fixed to the one side surface, and the heat dissipation And the light guide plate emits light incident on the one side surface from the light emitting element from the one wide surface and irradiates the display panel.
  • Two positioning projections that are provided so as to protrude substantially parallel to the one side surface at a position away from the shape portion, and the light guide plate is formed by cutting out both end portions of the one side surface. Positioned parts with contact surfaces that contact each other are provided.
  • the positioning protrusion has a circular cross section, and the positioned portion includes the contact surface parallel to the one side surface, and both sides of the corresponding contact surface on the one side surface.
  • a notch having a rectangular cross section including an end surface to be communicated, and an arc-shaped chamfer having a diameter larger than that of the position protrusion is formed at a corner between the contact surface and the end surface. It is characterized by that.
  • the display device is characterized in that, of the end surfaces on both sides of the contact surface, the end surface located on the end side of the light guide plate is shorter than the end surface located on the opposite side.
  • a box-shaped holding body that covers a peripheral portion of the light guide plate is opposed to another end surface parallel to the one end surface of the light guide plate, and a light emitting element is mounted on one surface.
  • a substrate, and the holding body includes a positioning protrusion protruding substantially parallel to one of the side surfaces of the light guide plate not facing the substrate, and the light guide plate cuts one of the side surfaces.
  • a positioned portion having a contact surface which is formed in a lacking shape and comes into contact with the positioning protrusion is provided.
  • a television receiver includes the display device according to any one of the above and a reception unit that receives a television broadcast, and based on the television broadcast received by the reception unit, An image is displayed on the display device.
  • the present invention it is possible to prevent the light guide plate from being displaced at the time of thermal expansion, and to prevent the light guide plate from falling off at the time of thermal contraction.
  • FIG. 10 is an explanatory diagram for illustrating an arrangement of LED substrates of a liquid crystal television according to a third embodiment.
  • 6 is a partial plan view showing a right side portion of a light guide plate according to Embodiment 3.
  • FIG. 10 is an explanatory diagram for illustrating an arrangement of LED substrates of a liquid crystal television according to a third embodiment.
  • 6 is a partial plan view showing a right side portion of a light guide plate according to Embodiment 3.
  • liquid crystal television including a display device (hereinafter referred to as “liquid crystal television”) is taken as an example.
  • FIG. 1 is a perspective view showing the appearance of the liquid crystal television 1.
  • the liquid crystal television 1 includes a front frame 11, a liquid crystal display panel (display panel) 12, a tuner unit 21, a stand 3, and a speaker unit 4.
  • the front frame 11 has a rectangular frame shape and covers the periphery of the liquid crystal display panel 12.
  • the liquid crystal display panel 12 has a rectangular plate shape and displays an image.
  • the stand 3 is for placing the liquid crystal television 1 on a flat surface such as a table.
  • the speaker unit 4 has a longitudinal dimension that is substantially the same as that of the front frame 11 and has a substantially rectangular parallelepiped shape. The speaker unit 4 is fixed so that one surface in the longitudinal direction faces one side surface in the longitudinal direction of the front frame 11.
  • the tuner unit 21 is provided inside the liquid crystal television 1.
  • the tuner unit 21 receives a television broadcast and extracts a broadcast signal.
  • the broadcast signal is separated into a video signal and an audio signal by a predetermined process.
  • a video is displayed on the liquid crystal display panel 12 based on the video signal, and audio is output from the speaker unit 4 based on the audio signal.
  • the stand 3 is for placing the liquid crystal television 1 on a flat surface such as a table.
  • the side of the liquid crystal television 1 on which the liquid crystal display panel 12 is provided is called the front side
  • the opposite side of the front side is called the rear side
  • the left and right sides of the liquid crystal television 1 are called the left side and the right side, respectively.
  • the upper and lower sides of the liquid crystal television 1 are referred to as an upper side and a lower side, respectively.
  • FIG. 2 is an exploded perspective view of the main part of the liquid crystal television 1.
  • the liquid crystal television 1 further includes an optical sheet 13, a middle chassis 14, a light guide plate 15, a reflection sheet 16, a light guide plate holder 17, an LED substrate 18, a heat spreader 19, and a backlight chassis (holding body) 20.
  • the optical sheet 13 is a sheet for diffusing and condensing light.
  • the optical sheet 13 is a laminate of a plurality of sheets such as a diffusion sheet and a prism sheet.
  • the middle chassis 14 includes four rod-shaped members made of resin, a lower middle chassis 141, a right middle chassis 142, an upper middle chassis 143, and a left middle chassis 144.
  • Each of the four middle chassis 141, 142, 143, 144 has a substantially L-shaped cross section.
  • the four middle chassis 141, 142, 143, 144 are combined to form a rectangular frame as a whole.
  • the light guide plate 15 is made of, for example, a highly transparent rectangular acrylic resin and has a predetermined thickness.
  • the light guide plate 15 converts light incident from the side surface into plane light and emits the light from one wide surface.
  • the reflective sheet 16 is a sheet having substantially the same shape as the light guide plate 15 in plan view.
  • the reflection sheet totally reflects light incident on the surface.
  • the light guide plate holder 17 is a strip-shaped member made of resin.
  • the light guide plate holder 17 holds the light guide plate 15.
  • the heat spreader 19 is interposed between the reflection sheet 16 and the heat spreader 19 so that heat is not transmitted from the heat spreader 19 to the light guide plate 15 and the reflection sheet 16.
  • the LED substrate 18 has a strip shape, and a plurality of white LEDs are mounted from one end to the other end of one surface.
  • the heat spreader 19 is an extruded product made of a metal having high thermal conductivity such as aluminum.
  • the heat spreader 19 has a substantially L-shaped cross section.
  • the heat spreader 19 has a function of dissipating heat generated in the LED substrate 18.
  • the backlight chassis 20 has a box shape with one side opened and a rectangular bottom.
  • the backlight chassis 20 is formed by pressing an iron plate.
  • the backlight chassis 20 accommodates the optical sheet 13, the middle chassis 14, the light guide plate 15, the reflection sheet 16, and the like.
  • the LCD TV 1 is assembled as follows. The case of assembling in a horizontal posture will be described. First, the backlight chassis 20 is placed on a work table or the like so that the opening is on the top. A heat spreader 19 in which the LED substrate 18 is previously fixed with a double-sided tape is screwed thereon. The light guide plate holder 17 is fixed to the heat spreader 19 along the LED substrate 18. The reflection sheet 16 and the light guide plate 15 are placed so that the lower end portions thereof overlap the light guide plate holder 17. The lower peripheral edge portion of the reflection sheet 16 and the light guide plate 15 is held by the light guide plate holder 17, and the left and right peripheral edge portions and the upper peripheral edge portion are held by the backlight chassis 20.
  • the middle chassis 14 is fixed to the backlight chassis 20 so as to cover the front peripheral edge of the light guide plate 15.
  • the side surface of the middle chassis 14 fits into the side surface of the backlight chassis 20 from the outside.
  • a projection is provided on the side surface of the middle chassis 14, and the middle chassis 14 is fixed to the backlight chassis 20 by fitting the projection into a hole provided on the side surface of the backlight chassis 20.
  • the liquid crystal television 1 configured as described above displays an image on the display surface of the liquid crystal display panel 12 by the following operation.
  • White light from the LED substrate 18 enters from one side surface of the light guide plate 15.
  • the light guide plate 15 emits incident light from the main surface.
  • the emitted light is irradiated to the back side of the liquid crystal display panel 12 through the optical sheet 13. Thereby, an image is displayed on the front side of the liquid crystal display panel 12.
  • the periphery of the optical sheet 13 is placed on the middle chassis 14 so as to cover the front surface of the light guide plate 15, and the liquid crystal display panel 12 is placed on the optical sheet 13.
  • the front frame 11 is placed so as to cover the peripheral edge of the liquid crystal display panel 12, and the front frame 11 and the backlight chassis 20 are fixed to each other with screws.
  • FIG. 3 is a partial plan view of the light guide plate 15.
  • FIG. 3 shows the front right corner of the light guide plate.
  • FIG. 4 is a perspective view of the heat spreader 19.
  • FIG. 5 is a surface view of the heat spreader 19.
  • FIG. 6 is a rear view of the heat spreader 19.
  • FIG. 7 is a left side view of the heat spreader 19.
  • FIG. 8 is a partial perspective view showing the appearance of the heat spreader 19.
  • FIG. 8 shows the right end portion of the heat spreader 19.
  • FIG. 9 is a partial perspective view showing the appearance of the heat spreader 19.
  • FIG. 9 shows the left end portion of the heat spreader 19.
  • FIG. 10 is an explanatory diagram showing the positional relationship between the concave portion 151 of the light guide plate 15 and the positioning protrusion 193 provided in the heat spreader 19.
  • FIG. 10 shows the right corner of the light guide plate 15.
  • a concave portion (positioned portion) 151 is formed below the right end portion of the light guide plate 15.
  • the recess 151 has a shape that is obtained by cutting the light guide plate 15 into a rectangular cross section.
  • a concave portion 151 is similarly provided below the left end portion of the light guide plate 15.
  • the heat spreader 19 includes a plate-shaped rear surface portion 191 and a substrate fixing portion (plate-shaped portion) 192 which are orthogonal to each other, and the side view is L-shaped.
  • a positioning protrusion 193 is provided below the right end portion of the rear surface portion 191.
  • the positioning protrusion 193 is a metallic pin having a cylindrical shape.
  • a base portion on a plate having a larger diameter than the bottom surface is provided on one bottom surface of the pin. This base portion is fixed to a through hole provided in the rear surface portion 191 by caulking, whereby the positioning projection 193 is fixed to the heat spreader 19.
  • a positioning protrusion 193 is provided on the lower side of the rear surface portion 191, similarly to the lower side of the right end portion.
  • the cross section of the positioning protrusion has a circular cross section.
  • the recess 151 is in contact with the positioning protrusion 193.
  • the contact surface 151 a of the recess 151 with the positioning protrusion 193 is parallel to the side surface (one side surface) of the light guide plate 15 facing the LED substrate 18.
  • End surfaces 151b and 151c are formed on both sides of the contact surface 151a of the recess 151 so as to communicate with one side surface.
  • the corner portion 151d between the contact surface 151a and the end surface 151b and the corner portion 151d between the contact surface 151a and the end surface 151c are formed with arc-shaped chamfers.
  • FIG. 10 shows the positional relationship between the recess 151 and the positioning protrusion 193 in a state (steady state) when the temperature is constant.
  • FIG. 10 shows the lower right corner.
  • the steady temperature refers to a temperature when the internal temperature of the liquid crystal television 1 is kept substantially constant.
  • the positioning protrusion 193 is in a position where it abuts near the center of the abutment surface 151 a of the recess 151 of the light guide plate 15.
  • FIG. 10 shows the lower right portion of the light guide plate 15, but the lower left corner of the light guide plate 15 is also in the same state as in FIG.
  • FIG. 11 is an explanatory view showing the arrangement of the elastic member 201.
  • FIG. 11 shows the upper right corner of the backlight chassis 20.
  • an elastic member 201 fixed to the backlight chassis 20 is disposed near the upper right corner of the light guide plate 15.
  • an elastic member 201 is also provided near the left corner.
  • the elastic member 201 is obtained by cutting out a microcell polymer, urethane foam, rubber, silicon, or the like formed into a sheet shape into an appropriate size.
  • a slight gap is provided between the light guide plate 15 and the elastic member 201. This gap is for improving the workability when the light guide plate 15 is placed on the backlight chassis 20.
  • the positioning of the light guide plate 15 in the vertical direction of the backlight chassis 20 is performed by the recess 151, the positioning protrusion 193, and the elastic member 201.
  • the positioning of the light guide plate 15 in the left-right direction of the backlight chassis 20 is performed by the elastic member 201.
  • FIG. 12 is an explanatory diagram showing the positional relationship between the concave portion 151 of the light guide plate 15 and the positioning protrusion 193 provided in the heat spreader 19.
  • FIG. 12 shows the lower right corner of the light guide plate 15.
  • FIG. 12 shows a case where the internal temperature of the liquid crystal television 1 becomes the upper limit of design (for example, 60 degrees) and the light guide plate 15 is thermally expanded.
  • the positioning protrusion 193 contacts the corner 151 d of the recess 151.
  • the lower left corner of the light guide plate 15 is also in the same state as in FIG.
  • the light guide plate 15 when the light guide plate 15 is thermally expanded, the light guide plate 15 is positioned in the left-right direction by the recesses 151 provided on the left and right sides of the lower edge of the light guide plate 15 and the positioning protrusions 193 provided in the heat spreader 19. The center position of the light guide plate 15 can be maintained. As the light guide plate 15 expands, the position of the middle chassis 14 moves outward. However, since the elastic member 201 contracts by the amount of movement, the entire light guide plate 15 is not curved.
  • FIG. 13 is an explanatory view showing the positional relationship between the concave portion 151 of the light guide plate 15 and the positioning protrusion 193 provided in the heat spreader 19.
  • FIG. 13 shows the lower right corner of the light guide plate 15.
  • FIG. 13 shows a case where the internal temperature of the liquid crystal television 1 becomes the lower limit of design (for example, ⁇ 40 degrees) and the light guide plate 15 is thermally contracted. As shown in FIG. 13, when the light guide plate 15 is thermally contracted, the positioning protrusion 193 comes into contact with the corner 151 d of the recess 151.
  • the lower left corner of the light guide plate 15 is also in the same state as in FIG.
  • the light guide plate 15 when the light guide plate 15 is thermally contracted, the light guide plate 15 is positioned in the left-right direction by the recesses 151 provided on the left and right sides of the lower edge of the light guide plate 15 and the positioning protrusions 193 provided in the heat spreader 19.
  • the center position of the light guide plate 15 can be maintained. There is a possibility that a gap between the middle chassis 14 and the light guide plate 15 is generated as the light guide plate 15 contracts. However, since the elastic member 201 is restored to that extent, there is no gap between the large shakiness.
  • the positioning protrusion 193 is cylindrical, the positioning protrusion 193 and the contact surface 151a are in point contact. Thereby, even when the light guide plate 15 is thermally expanded or contracted, the contact surface 151a can slide on the positioning protrusion 193. Furthermore, since the radius of curvature of the corner portion 151d is slightly larger than the radius of the cross-sectional circle of the positioning projection 193, the contact between the positioning projection 193 and the corner portion 151d is also a point contact.
  • the contact surface 151 a of the recess 151 is parallel to the side surface (one side surface) facing the LED substrate 1.
  • the light guide plate 15 even if the light guide plate 15 is thermally contracted or thermally expanded, no deviation occurs in the center position in the left-right direction of the light guide plate 15, and the light guide plate 15 and the LED substrate 18. There is no change in the gap size. Even when the light guide plate 15 is thermally contracted or thermally expanded, the light guide plate 15 can appropriately emit light from the LED substrate 18 to the liquid crystal display panel 12. Further, even when the light guide plate 15 is in thermal contraction or thermal expansion, the concave portion 151 contacts and is supported by the positioning projection 193, so that the light guide plate 15 can be prevented from dropping down. .
  • the LED substrate 18 and the light guide plate 15 are fixed to the heat spreader 19, it is easy to assemble the light guide plate 15 so that the distance between the LED substrate 18 and the lower surface of the light guide plate 15 is appropriate. It is.
  • the LED board 18 is fixed to the heat spreader 19
  • the light guide plate 15 is fixed to the backlight chassis 20, and the heat spreader 19 is fixed to the backlight chassis 20, an assembly error between the components causes the LED board 18 to be introduced. This greatly affects the error in the distance from the lower surface of the optical plate 15.
  • the error when the LED board 18 and the light guide plate 15 are assembled to the same component (heat spreader 19) is an error when the LED board 18 is attached to the heat spreader 19, and an error when the light guide plate 15 is positioned by the heat spreader 19. This is because the cause of error is reduced.
  • the curvature of the corner portion 151 d of the concave portion 151 of the light guide plate 15 is slightly larger than the curvature of the outer peripheral surface of the positioning protrusion 193.
  • the curvature radius of the corner portion 151d is preferably 1.7 mm. The reason why a slight difference is provided in the radius of curvature is to make point contact between the positioning protrusion 193 and the corner portion 151d.
  • the positioning projection 193 When the contact area between the positioning projection 193 and the corner portion 151d increases, the positioning projection 193 does not move away from the corner portion 151d when the light guide plate 15 returns to the normal state from thermal expansion or thermal contraction, and the light guide plate 15 is damaged or displaced. Because there is a possibility of causing.
  • FIG. 14 is a partial plan view of the light guide plate 15 according to the second embodiment.
  • FIG. 14 shows the lower right corner of the light guide plate.
  • the second embodiment is characterized in that the right end surface 151c of the recess 151 is shorter than the left end surface 151b.
  • the right end surface 151c is shorter than the left end surface 151b by a dimension h.
  • FIG. 15 is an explanatory diagram showing a positional relationship between the concave portion 151 of the light guide plate 15 according to the second embodiment and the positioning protrusion 193 provided in the heat spreader 19.
  • FIG. 15 shows a case where the light guide plate 15 is thermally contracted.
  • the positioning protrusion 193 is in contact with the corner 151 d of the recess 151.
  • the lower end portion 152 b of the end surface 151 d is positioned below the center of the sectional circle of the positioning projection 193 by the dimension d. .
  • the lower end portion 152b is configured to be positioned below the center of the cross-sectional circle of the positioning protrusion 193.
  • the liquid crystal television 1 according to the second embodiment has the following effects in addition to the effects shown in the first embodiment. Since the liquid crystal television 1 according to Embodiment 2 is configured such that the end surface 151c on the right side of the recess 151 of the light guide plate 15 is shorter than the end surface 151b on the left side, the lower right corner of the light guide plate 15 is damaged during assembly. It becomes possible to prevent.
  • FIG. 16 is an explanatory diagram for illustrating an arrangement of the LED substrate 18 of the liquid crystal television 1 according to the third embodiment.
  • the LED substrates 18 are arranged vertically so as to sandwich two parallel side surfaces of the light guide plate 15. By having two LED boards 18, it is possible to increase the brightness of the screen.
  • the light guide plate 15 is thermally contracted or expanded, it is necessary not to shift the center position of the light guide plate 15 in the vertical direction.
  • the liquid crystal television 1 according to Embodiment 3 needs to be configured so as not to shift the vertical center position of the light guide plate 15.
  • FIG. 17 is a partial plan view showing the right side portion of the light guide plate 15 according to the third embodiment.
  • a concave portion 153 is provided on the right side surface of the light guide plate 15.
  • the recess 153 has a shape in which the light guide plate 15 is cut out in a semicircular shape in plan view.
  • the recess 153 is provided at the approximate center of the light guide plate 15 in the vertical direction.
  • the backlight chassis 20 is provided with positioning protrusions 202 at positions corresponding to the recesses 153.
  • the positioning protrusion 202 has a cylindrical shape and protrudes from the back side of the light guide plate 15 toward the front side.
  • the positioning protrusion 202 is provided at the approximate center of the backlight chassis 20 in the vertical direction.
  • the positioning protrusion 202 is fitted in the recess 153. Thereby, the light guide plate 15 is positioned in the vertical direction. Further, even when the light guide plate 15 is thermally contracted or expanded, it is possible to prevent the center position in the vertical direction of the light guide plate 15 from being shifted.
  • the liquid crystal television 1 according to the third embodiment has a structure in which the LED substrate 18 is opposed to two parallel side surfaces of the light guide plate 15, and even when the light guide plate 15 is thermally contracted or expanded, the two The center position of the side surface in the opposing direction does not shift. Thereby, it is possible to prevent the occurrence of unevenness in the amount of light applied to the liquid crystal display panel 12.
  • the concave portion 153 and the positioning projection 202 are provided on the right side of the liquid crystal television 1, but may be provided on the left side of the liquid crystal television 1. Further, as in the first embodiment, the recesses 151 may be provided at both lower ends of the light guide plate 15, and the positioning protrusions 193 may be provided below the left and right end portions of the heat spreader 19.
  • the display device (1) includes a display panel (12) that displays an image on the front side, a rectangular plate shape, and a light guide plate (15) that is arranged with a wide surface facing the rear side of the display panel. ), A substrate (18) having a light emitting element mounted on one surface, and a plate-like portion (192) parallel to one side surface of the light guide plate, the substrate on the plate-like portion, and the one side surface A heat dissipating body (19) fixed so that the mounting surface of the light emitting element is opposed, and the light guide plate emits light incident on the one side surface from the light emitting element from the one wide surface, and the display panel
  • the heat dissipator includes two positioning protrusions (193) that protrude from the plate-like portion so as to be substantially parallel to the one side surface.
  • the light guide plate is formed by cutting out both end portions of the one side surface, and the positioning protrusion Characterized in that the positioning unit (151) is provided with an abutment
  • the radiator is provided with two positioning projections
  • the light guide plate is provided with a positioned portion having a contact surface that contacts each of the positioning projections.
  • the positioning protrusion has a circular cross section, and the positioned portion includes the contact surface parallel to the one side surface, and both sides of the corresponding contact surface on the one side surface. It is a notch part of the rectangular cross section containing the end surface (151b, 151c) to communicate, Comprising: The corner
  • the contact surface of the positioned portion is parallel to one side surface, the distance between one side surface of the light guide plate and the light emitting element can be kept constant even when the light guide plate is thermally contracted or thermally expanded. It becomes possible.
  • the display device is characterized in that, of the end surfaces on both sides of the contact surface, the end surface located on the end side of the light guide plate is shorter than the end surface located on the opposite side.
  • the end face located on the end side of the light guide plate is shorter than the end face located on the opposite side, it is possible to prevent the light guide plate from being damaged during assembly.
  • the display device has a box-shaped holding body (20) covering a peripheral edge of the light guide plate, and another end face parallel to the one end face of the light guide plate, and the light emitting element is mounted on one surface.
  • the holding frame body includes a positioning projection (202) provided so as to project substantially parallel to one of the side surfaces of the light guide plate not facing the substrate,
  • the light guide plate is formed by notching one of the side surfaces, and is provided with a positioned portion (153) having a contact surface that contacts the positioning protrusion.
  • the substrate further includes a substrate on which the light emitting element is mounted, and the holding body is provided with a positioning portion that protrudes substantially parallel to one of the side surfaces not facing the substrate of the light guide plate.
  • a notch-shaped portion On one side surface of the light guide plate that does not face the substrate, a notch-shaped portion to be positioned into which the positioning portion is gently inserted is provided.
  • a television receiver includes the display device described above and a receiving unit that receives a television broadcast, and displays video on the display device based on the television broadcast received by the receiving unit. It is characterized by being displayed.
  • the radiator is provided with two positioning projections
  • the light guide plate is provided with a positioned portion having a contact surface that contacts each of the positioning projections.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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  • Optics & Photonics (AREA)
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  • Liquid Crystal (AREA)

Abstract

An objective of the present invention is to provide a liquid-crystal display device, etc., which is capable of preventing misalignment of a light guide plate when thermally expanding, and which is capable of preventing the light guide plate from falling away when thermally contracting. Provided is a display device, comprising a display panel (12) which displays a video on a front side, a light guide plate which forms a rectangular shape and which is positioned with a wide surface thereof facing the rear side of the display panel, and a heat spreader which further comprises a plate-shaped part which is parallel to a lateral surface of the light guide plate and which has the substrate anchored to the plate-shaped part with the lateral surface facing the light-emitting element mounting surface, said light guide plate being configured such that light from the light-emitting elements enters the lateral surface, is emitted from the wide surface, and is projected upon the display panel (12). The heat spreader further comprises two alignment protrusions which are positioned protruding approximately parallel to the lateral surface in locations isolated from the plate-shaped part. The light guide plate has parts for alignment which are formed by cutting both end parts of the lateral surface and have contact surfaces which make contact with the respective alignment protrusions.

Description

表示装置及びテレビジョン受信機Display device and television receiver
　本発明はエッジライト方式の表示装置、及び該表示装置を備えたテレビジョン受信機に関する。 The present invention relates to an edge light type display device and a television receiver including the display device.
　液晶パネルを表示パネルとして備える液晶表示装置は、薄形で軽量である上、消費電力が小さい。そのことから、近年、テレビジョン受信機、コンピュータ及び携帯端末用の画像表示装置として、液晶表示装置が広く採用されている。 A liquid crystal display device provided with a liquid crystal panel as a display panel is thin and lightweight and consumes little power. Therefore, in recent years, liquid crystal display devices have been widely adopted as image display devices for television receivers, computers, and portable terminals.
　液晶表示装置は、前側に映像を表示する液晶表示パネル、液晶表示パネルの後側に光を照射するバックライトを含む。バックライトには直下型とエッジ型がある。近年多く採用されているエッジ型のバックライトは、一面が開口された箱体状の保持体上に、反射シート、導光板、光学シートを重ね置き、一面にＬＥＤ（Ｌｉｇｈｔ　Ｅｍｉｔｔｉｎｇ　Ｄｉｏｄｅ）などの発光素子が実装してある基板を、導光板の一側面と対向させるように固定する。そして、枠体状のミドルシャーシを導光板の周縁を覆うようにして、バックライトシャーシに固定する。液晶表示装置は、バックライトの導光板の広面に対向するように、液晶表示パネルを載せおき、枠体状をなすフロントフレームを液晶表示パネルの周縁部を覆うようにして、当該フロントフレームをバックライトシャーシに固定して、構成される。反射シート、導光板、光学シート、液晶表示パネルは、フロントフレームとバックライトシャーシとにより挟持固定される。 The liquid crystal display device includes a liquid crystal display panel that displays an image on the front side and a backlight that irradiates light on the rear side of the liquid crystal display panel. There are direct type and edge type backlight. Edge-type backlights that have been widely adopted in recent years have a reflective sheet, a light guide plate, and an optical sheet placed on top of a box-shaped holder that is open on one side, and light emission such as LEDs (Light Emitting Diodes) on one side. The substrate on which the element is mounted is fixed so as to face one side surface of the light guide plate. Then, the frame-like middle chassis is fixed to the backlight chassis so as to cover the periphery of the light guide plate. In the liquid crystal display device, the liquid crystal display panel is placed so as to face the wide surface of the light guide plate of the backlight, and the front frame having a frame shape covers the periphery of the liquid crystal display panel, and the front frame is backed. Fixed to the light chassis. The reflection sheet, the light guide plate, the optical sheet, and the liquid crystal display panel are sandwiched and fixed by the front frame and the backlight chassis.
　ところで、液晶表示装置は環境温度によって、内部の部材が膨張、収縮するという問題がある。部材の材質によって膨張率が異なるため、環境温度によっては、部材間に隙間が発生する。そのことにより、導光板にガタツキや位置ずれが発生する場合がある。 Incidentally, the liquid crystal display device has a problem that the internal members expand and contract depending on the environmental temperature. Since the expansion rate differs depending on the material of the member, a gap is generated between the members depending on the environmental temperature. As a result, rattling or misalignment may occur in the light guide plate.
　このような問題に対して、特許文献１には、凹状に形成された一対の凹部を有する導光板と、バックライトシャーシの内壁に当接するように配置され、導光板を押圧可能な一対の弾性部材とを備え、弾性部材は少なくとも一部が導光板に形成された凹部に当接すると共に、凹部を押圧可能な突起を有し、突起は、常温時において凹部における外側近傍に位置するように形成された表示装置が記載されている。 For such a problem, Patent Document 1 discloses that a light guide plate having a pair of concave portions formed in a concave shape and a pair of elastic members arranged so as to contact the inner wall of the backlight chassis and capable of pressing the light guide plate. The elastic member has at least a part that contacts the recess formed on the light guide plate and has a protrusion capable of pressing the recess, and the protrusion is formed to be located near the outside of the recess at room temperature. A display device is described.
特開２０１２－１５０００号公報JP 2012-15000 A
　しかしながら、特許文献１の表示装置では、凹部がＬＥＤ基板と対向する面の端部から、ＬＥＤと対向と部分にまで及んでいる。ＬＥＤと対向する部分にまで、凹部を設けたことによる光ムラの発生を考慮しておらず、特許文献１の構成は採用できない。 However, in the display device of Patent Document 1, the recess extends from the end of the surface facing the LED substrate to the portion facing the LED. The occurrence of unevenness of light due to the provision of the concave portions up to the portion facing the LED is not considered, and the configuration of Patent Document 1 cannot be adopted.
　また、液晶表示装置の狭額縁化に伴い、導光板の寸法を小さくし、表示パネルの寸法に近づけるような設計がされている。それにより、導光板においては、挟持固定するために使用できる周縁部の領域が小さくなっている。そのため、導光板が熱収縮すると、周縁部がミドルシャーシと接触しなくなり、脱落してしまう虞があった。 Also, with the narrowing of the frame of the liquid crystal display device, the design of the light guide plate is made smaller and close to the size of the display panel. Thereby, in the light guide plate, the peripheral area that can be used for clamping is reduced. Therefore, when the light guide plate is thermally contracted, the peripheral portion may not come into contact with the middle chassis and may fall off.
　本発明は斯かる事情に鑑みてなされたものであって、熱膨張時の導光板のずれを防ぎ、熱収縮時に導光板の脱落を防ぐことが可能な液晶表示装置等を提供することにある。 The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a liquid crystal display device and the like that can prevent the light guide plate from being displaced during thermal expansion and can prevent the light guide plate from falling out during thermal contraction. .
　本発明に係る表示装置は、前側で映像を表示する表示パネルと、矩形板状をなし、前記表示パネルの後側に一広面を対向させて配された導光板と、一面に発光素子が実装してある基板と、前記導光板の一側面と平行な板状部を有し、該板状部に前記基板を、前記一側面に前記発光素子の実装面を対向させて固定してある放熱体とを備え、前記導光板は、前記発光素子から前記一側面に入射する光を前記一広面から出射して前記表示パネルに照射するようにしてある表示装置において、前記放熱体は、前記板状部から離れた位置に、前記一側面と略平行をなして突設された２つの位置決め突起を備え、前記導光板は、前記一側面の両端部を切り欠いて形成され、前記位置決め突起の夫々と当接する当接面を有する被位置決め部が設けてあることを特徴とする。 The display device according to the present invention includes a display panel that displays an image on the front side, a rectangular plate shape, a light guide plate that is arranged with a wide surface facing the rear side of the display panel, and a light emitting element mounted on the one surface. And a plate-like portion parallel to one side surface of the light guide plate, and the substrate is fixed to the plate-like portion, and the mounting surface of the light-emitting element is fixed to the one side surface, and the heat dissipation And the light guide plate emits light incident on the one side surface from the light emitting element from the one wide surface and irradiates the display panel. Two positioning projections that are provided so as to protrude substantially parallel to the one side surface at a position away from the shape portion, and the light guide plate is formed by cutting out both end portions of the one side surface. Positioned parts with contact surfaces that contact each other are provided. The features.
　本発明に係る表示装置は、前記位置決め突起は、円形断面を有しており、前記被位置決め部は、前記一側面と平行をなす前記当接面と、該当接面の両側を前記一側面に連絡する端面とを含む矩形断面の切欠き部であって、前記当接面と前記端面との間の角部には、前記位置突起よりも径の大きい円弧形の面取りが形成してあることを特徴とする。 In the display device according to the present invention, the positioning protrusion has a circular cross section, and the positioned portion includes the contact surface parallel to the one side surface, and both sides of the corresponding contact surface on the one side surface. A notch having a rectangular cross section including an end surface to be communicated, and an arc-shaped chamfer having a diameter larger than that of the position protrusion is formed at a corner between the contact surface and the end surface. It is characterized by that.
　本発明に係る表示装置は、前記当接面の両側の端面のうち、前記導光板の端部側に位置する端面は、逆側に位置する端面よりも短くしてあることを特徴とする。 The display device according to the present invention is characterized in that, of the end surfaces on both sides of the contact surface, the end surface located on the end side of the light guide plate is shorter than the end surface located on the opposite side.
　本発明に係る表示装置は、前記導光板の周縁部を覆う箱体状の保持体と、前記導光板の前記一端面と平行な他の端面と対向し、発光素子が一面に実装してある基板とを更に備え、前記保持体には、前記導光板の前記基板と対向しない側面の一方と略平行をなして突設された位置決め突起を備え、前記導光板は、前記側面の一方を切り欠いて形成され、前記位置決め突起と当接する当接面を有する被位置決め部が設けてあることを特徴とする。 In the display device according to the present invention, a box-shaped holding body that covers a peripheral portion of the light guide plate is opposed to another end surface parallel to the one end surface of the light guide plate, and a light emitting element is mounted on one surface. A substrate, and the holding body includes a positioning protrusion protruding substantially parallel to one of the side surfaces of the light guide plate not facing the substrate, and the light guide plate cuts one of the side surfaces. A positioned portion having a contact surface which is formed in a lacking shape and comes into contact with the positioning protrusion is provided.
　本発明に係るテレビジョン受信機は、上述のいずれか一つに記載の表示装置と、テレビジョン放送を受信する受信部とを備え、前記受信部にて受信したテレビジョン放送に基づいて、前記表示装置に映像を表示するようにしてあることを特徴とする。 A television receiver according to the present invention includes the display device according to any one of the above and a reception unit that receives a television broadcast, and based on the television broadcast received by the reception unit, An image is displayed on the display device.
　本発明にあっては、熱膨張時の導光板のずれを防ぎ、熱収縮時に導光板の脱落を防ぐことが可能となる。 In the present invention, it is possible to prevent the light guide plate from being displaced at the time of thermal expansion, and to prevent the light guide plate from falling off at the time of thermal contraction.
液晶テレビの外観を示す斜視図である。It is a perspective view which shows the external appearance of a liquid crystal television. 液晶テレビの主要部の分解斜視図である。It is a disassembled perspective view of the principal part of a liquid crystal television. 導光板の部分平面図である。It is a partial top view of a light-guide plate. ヒートスプレッダの斜視図である。It is a perspective view of a heat spreader. ヒートスプレッダの表面図である。It is a surface view of a heat spreader. ヒートスプレッダの裏面図である。It is a reverse view of a heat spreader. ヒートスプレッダの左側面図である。It is a left view of a heat spreader. ヒートスプレッダの外観を示す部分斜視図である。It is a fragmentary perspective view which shows the external appearance of a heat spreader. ヒートスプレッダの外観を示す部分斜視図である。It is a fragmentary perspective view which shows the external appearance of a heat spreader. 導光板の凹部とヒートスプレッダが備える位置決め突起との位置関係を示す説明図である。It is explanatory drawing which shows the positional relationship of the recessed part of a light-guide plate, and the positioning protrusion with which a heat spreader is provided. 弾性部材の配置を示す説明図である。It is explanatory drawing which shows arrangement | positioning of an elastic member. 導光板の凹部とヒートスプレッダが備える位置決め突起との位置関係を示す説明図である。It is explanatory drawing which shows the positional relationship of the recessed part of a light-guide plate, and the positioning protrusion with which a heat spreader is provided. 導光板の凹部とヒートスプレッダが備える位置決め突起との位置関係を示す説明図である。It is explanatory drawing which shows the positional relationship of the recessed part of a light-guide plate, and the positioning protrusion with which a heat spreader is provided. 実施の形態２に係る導光板の部分平面図である。6 is a partial plan view of a light guide plate according to Embodiment 2. FIG. 実施の形態２に係る導光板の凹部とヒートスプレッダが備える位置決め突起との位置関係を示す説明図である。It is explanatory drawing which shows the positional relationship of the recessed part of the light-guide plate which concerns on Embodiment 2, and the positioning protrusion with which a heat spreader is provided. 実施の形態３に係る液晶テレビのＬＥＤ基板の配置を示すための説明図である。FIG. 10 is an explanatory diagram for illustrating an arrangement of LED substrates of a liquid crystal television according to a third embodiment. 実施の形態３に係る導光板の右側部を示す部分平面図である。6 is a partial plan view showing a right side portion of a light guide plate according to Embodiment 3. FIG.
　以下、本発明をその実施の形態を示す図面に基づき具体的に説明する。ここでは、表示装置を備える液晶テレビジョン（以下、「液晶テレビ」と記す）を例とする。 Hereinafter, the present invention will be specifically described with reference to the drawings illustrating embodiments thereof. Here, a liquid crystal television including a display device (hereinafter referred to as “liquid crystal television”) is taken as an example.
（実施の形態１）
　図１は液晶テレビ１の外観を示す斜視図である。液晶テレビ１はフロントフレーム１１、液晶表示パネル（表示パネル）１２、チューナ部２１、スタンド３、スピーカユニット４を含む。フロントフレーム１１は矩形枠状をなし、液晶表示パネル１２の周縁を覆っている。液晶表示パネル１２は矩形板状をなし、映像を表示する。スタンド３は、液晶テレビ１をテーブル等の平面に立てて載置するためのものである。スピーカユニット４は、長手方向の寸法がフロントフレーム１１とほぼ同一で、略直方体状をなしている。スピーカユニット４は、長手方向の一面が、フロントフレーム１１の長手方向の一側面と対向するようにして、固定される。チューナ部２１は液晶テレビ１の内部に備えられている。チューナ部２１は、テレビジョン放送を受信し、放送信号を取り出す。放送信号は所定の処理により、映像信号と音声信号に分離される。映像信号に基づき液晶表示パネル１２に映像が表示され、音声信号に基づき、スピーカユニット４より音声が出力される。スタンド３は、液晶テレビ１をテーブル等の平面に立てて載置するためのものである。 (Embodiment 1)
FIG. 1 is a perspective view showing the appearance of the liquid crystal television 1. The liquid crystal television 1 includes a front frame 11, a liquid crystal display panel (display panel) 12, a tuner unit 21, a stand 3, and a speaker unit 4. The front frame 11 has a rectangular frame shape and covers the periphery of the liquid crystal display panel 12. The liquid crystal display panel 12 has a rectangular plate shape and displays an image. The stand 3 is for placing the liquid crystal television 1 on a flat surface such as a table. The speaker unit 4 has a longitudinal dimension that is substantially the same as that of the front frame 11 and has a substantially rectangular parallelepiped shape. The speaker unit 4 is fixed so that one surface in the longitudinal direction faces one side surface in the longitudinal direction of the front frame 11. The tuner unit 21 is provided inside the liquid crystal television 1. The tuner unit 21 receives a television broadcast and extracts a broadcast signal. The broadcast signal is separated into a video signal and an audio signal by a predetermined process. A video is displayed on the liquid crystal display panel 12 based on the video signal, and audio is output from the speaker unit 4 based on the audio signal. The stand 3 is for placing the liquid crystal television 1 on a flat surface such as a table.
　以下の説明においては、液晶テレビ１の液晶表示パネル１２が設けられた側を前側と呼び、前側の反対側を後側と呼び、液晶テレビ１に向かって左右をそれぞれ左側、右側と呼ぶ。また、液晶テレビ１に向かって上下をそれぞれ上側、下側と呼ぶ。
　また、液晶テレビ１の各構成要素の説明においては、各構成要素が組み付けられた状態での方向を記述する。 In the following description, the side of the liquid crystal television 1 on which the liquid crystal display panel 12 is provided is called the front side, the opposite side of the front side is called the rear side, and the left and right sides of the liquid crystal television 1 are called the left side and the right side, respectively. The upper and lower sides of the liquid crystal television 1 are referred to as an upper side and a lower side, respectively.
In the description of each component of the liquid crystal television 1, the direction in the state where each component is assembled is described.
　図２は液晶テレビ１の主要部の分解斜視図である。液晶テレビ１は、さらに、光学シート１３、ミドルシャーシ１４、導光板１５、反射シート１６、導光板ホルダ１７、ＬＥＤ基板１８、ヒートスプレッダ１９、バックライトシャーシ（保持体）２０を含む。 FIG. 2 is an exploded perspective view of the main part of the liquid crystal television 1. The liquid crystal television 1 further includes an optical sheet 13, a middle chassis 14, a light guide plate 15, a reflection sheet 16, a light guide plate holder 17, an LED substrate 18, a heat spreader 19, and a backlight chassis (holding body) 20.
　光学シート１３は、光を拡散、集光等するためのシートである。光学シート１３は、拡散シート、プリズムシート等の複数のシートが積層されたものである。 The optical sheet 13 is a sheet for diffusing and condensing light. The optical sheet 13 is a laminate of a plurality of sheets such as a diffusion sheet and a prism sheet.
　ミドルシャーシ１４は、樹脂で形成された４つの棒状部材、下側ミドルシャーシ１４１、右側ミドルシャーシ１４２、上側ミドルシャーシ１４３、左側ミドルシャーシ１４４を含む。４つのミドルシャーシ１４１、１４２、１４３、１４４はそれぞれ断面が略Ｌ字状をなしている。４つのミドルシャーシ１４１、１４２、１４３、１４４が組み合わさることにより、全体として矩形枠状をなす。 The middle chassis 14 includes four rod-shaped members made of resin, a lower middle chassis 141, a right middle chassis 142, an upper middle chassis 143, and a left middle chassis 144. Each of the four middle chassis 141, 142, 143, 144 has a substantially L-shaped cross section. The four middle chassis 141, 142, 143, 144 are combined to form a rectangular frame as a whole.
　導光板１５は、例えば透明度の高い矩形のアクリル樹脂からなり、所定の厚みを有している。導光板１５は側面から入射される光を平面光に変えて、一方の広面から出射する。 The light guide plate 15 is made of, for example, a highly transparent rectangular acrylic resin and has a predetermined thickness. The light guide plate 15 converts light incident from the side surface into plane light and emits the light from one wide surface.
　反射シート１６は、導光板１５と平面視形状が略同一のシートである。反射シートは表面に入射した光を全反射する。 The reflective sheet 16 is a sheet having substantially the same shape as the light guide plate 15 in plan view. The reflection sheet totally reflects light incident on the surface.
　導光板ホルダ１７は樹脂製の短冊状の部材である。導光板ホルダ１７は導光板１５を保持する。また、ヒートスプレッダ１９から導光板１５及び反射シート１６へ熱が伝わらないように、反射シート１６とヒートスプレッダ１９との間に介在する。 The light guide plate holder 17 is a strip-shaped member made of resin. The light guide plate holder 17 holds the light guide plate 15. Further, the heat spreader 19 is interposed between the reflection sheet 16 and the heat spreader 19 so that heat is not transmitted from the heat spreader 19 to the light guide plate 15 and the reflection sheet 16.
　ＬＥＤ基板１８は短冊状をなし、一面の一端から他端にわたり白色ＬＥＤが複数実装されている。 The LED substrate 18 has a strip shape, and a plurality of white LEDs are mounted from one end to the other end of one surface.
　ヒートスプレッダ１９は、例えばアルミニウムなどの熱伝導性の高い金属による押出成形品である。ヒートスプレッダ１９は断面略Ｌ字状である。ヒートスプレッダ１９は、ＬＥＤ基板１８で発生した熱を発散させる機能を担っている。 The heat spreader 19 is an extruded product made of a metal having high thermal conductivity such as aluminum. The heat spreader 19 has a substantially L-shaped cross section. The heat spreader 19 has a function of dissipating heat generated in the LED substrate 18.
　バックライトシャーシ２０は、一面が開口され矩形状の底を有する箱体状をなす。バックライトシャーシ２０は、鉄板をプレス加工して形成する。バックライトシャーシ２０は光学シート１３、ミドルシャーシ１４、導光板１５、反射シート１６などを収容する。 The backlight chassis 20 has a box shape with one side opened and a rectangular bottom. The backlight chassis 20 is formed by pressing an iron plate. The backlight chassis 20 accommodates the optical sheet 13, the middle chassis 14, the light guide plate 15, the reflection sheet 16, and the like.
　液晶テレビ１は以下のように組み立てられる。横姿勢で組み上げる場合について説明する。まず、バックライトシャーシ２０を作業台などに開口部が上となるように置く。その上に予めＬＥＤ基板１８を両面テープで固定したヒートスプレッダ１９をネジ止めする。導光板ホルダ１７をＬＥＤ基板１８に沿うように、ヒートスプレッダ１９に固定する。反射シート１６、導光板１５を、下端部が導光板ホルダ１７の上に重なるように置く。反射シート１６、導光板１５の下周縁部は導光板ホルダ１７で保持され、左右周縁部、上周縁部は、バックライトシャーシ２０に保持される。導光板１５の前側周縁部を覆うように、ミドルシャーシ１４をバックライトシャーシ２０に固定する。ミドルシャーシ１４の側面が、バックライトシャーシ２０の側面に外側から嵌る。ミドルシャーシ１４の側面には突起が設けてあり、この突起がバックライトシャーシ２０の側面に設けた孔部に嵌ることにより、ミドルシャーシ１４はバックライトシャーシ２０に固定される。 The LCD TV 1 is assembled as follows. The case of assembling in a horizontal posture will be described. First, the backlight chassis 20 is placed on a work table or the like so that the opening is on the top. A heat spreader 19 in which the LED substrate 18 is previously fixed with a double-sided tape is screwed thereon. The light guide plate holder 17 is fixed to the heat spreader 19 along the LED substrate 18. The reflection sheet 16 and the light guide plate 15 are placed so that the lower end portions thereof overlap the light guide plate holder 17. The lower peripheral edge portion of the reflection sheet 16 and the light guide plate 15 is held by the light guide plate holder 17, and the left and right peripheral edge portions and the upper peripheral edge portion are held by the backlight chassis 20. The middle chassis 14 is fixed to the backlight chassis 20 so as to cover the front peripheral edge of the light guide plate 15. The side surface of the middle chassis 14 fits into the side surface of the backlight chassis 20 from the outside. A projection is provided on the side surface of the middle chassis 14, and the middle chassis 14 is fixed to the backlight chassis 20 by fitting the projection into a hole provided on the side surface of the backlight chassis 20.
　以上のように構成された液晶テレビ１は、次のような動作により、液晶表示パネル１２の表示面に画像を表示する。ＬＥＤ基板１８からの白色光が導光板１５の一側面から入射する。導光板１５は入射した光を主面より出射する。出射した光は光学シート１３を介して、液晶表示パネル１２の裏側に照射される。それにより、液晶表示パネル１２の表側に画像が表示される。 The liquid crystal television 1 configured as described above displays an image on the display surface of the liquid crystal display panel 12 by the following operation. White light from the LED substrate 18 enters from one side surface of the light guide plate 15. The light guide plate 15 emits incident light from the main surface. The emitted light is irradiated to the back side of the liquid crystal display panel 12 through the optical sheet 13. Thereby, an image is displayed on the front side of the liquid crystal display panel 12.
　導光板１５の前面を覆うように、光学シート１３の周縁部をミドルシャーシ１４に載置し、さらに光学シート１３の上に、液晶表示パネル１２を載せる。フロントフレーム１１を液晶表示パネル１２の周縁部を覆うようにおき、フロントフレーム１１とバックライトシャーシ２０を互いにねじで固定する。 The periphery of the optical sheet 13 is placed on the middle chassis 14 so as to cover the front surface of the light guide plate 15, and the liquid crystal display panel 12 is placed on the optical sheet 13. The front frame 11 is placed so as to cover the peripheral edge of the liquid crystal display panel 12, and the front frame 11 and the backlight chassis 20 are fixed to each other with screws.
　次に導光板１５の位置決めについて述べる。図３は導光板１５の部分平面図である。図３は導光板の前側右角を示している。図４はヒートスプレッダ１９の斜視図である。図５はヒートスプレッダ１９の表面図である。図６はヒートスプレッダ１９の裏面図である。図７はヒートスプレッダ１９の左側面図である。図８はヒートスプレッダ１９の外観を示す部分斜視図である。図８はヒートスプレッダ１９の右端部を示している。図９はヒートスプレッダ１９の外観を示す部分斜視図である。図９はヒートスプレッダ１９の左端部を示している。図１０は導光板１５の凹部１５１とヒートスプレッダ１９が備える位置決め突起１９３との位置関係を示す説明図である。図１０は導光板１５の右角を示している。 Next, the positioning of the light guide plate 15 will be described. FIG. 3 is a partial plan view of the light guide plate 15. FIG. 3 shows the front right corner of the light guide plate. FIG. 4 is a perspective view of the heat spreader 19. FIG. 5 is a surface view of the heat spreader 19. FIG. 6 is a rear view of the heat spreader 19. FIG. 7 is a left side view of the heat spreader 19. FIG. 8 is a partial perspective view showing the appearance of the heat spreader 19. FIG. 8 shows the right end portion of the heat spreader 19. FIG. 9 is a partial perspective view showing the appearance of the heat spreader 19. FIG. 9 shows the left end portion of the heat spreader 19. FIG. 10 is an explanatory diagram showing the positional relationship between the concave portion 151 of the light guide plate 15 and the positioning protrusion 193 provided in the heat spreader 19. FIG. 10 shows the right corner of the light guide plate 15.
　図３に示すように、導光板１５の右端部の下側には、凹部（被位置決め部）１５１が形成してある。凹部１５１は導光板１５を断面矩形状に切り欠いたような形状としてある。導光板１５の左端部下側にも、同様に凹部１５１が設けてある。 As shown in FIG. 3, a concave portion (positioned portion) 151 is formed below the right end portion of the light guide plate 15. The recess 151 has a shape that is obtained by cutting the light guide plate 15 into a rectangular cross section. A concave portion 151 is similarly provided below the left end portion of the light guide plate 15.
　図４、５及び８に示すように、ヒートスプレッダ１９は直交する板状の後面部１９１及び基板固定部（板状部）１９２を含み、側面視がＬ字状をなしている。後面部１９１の右端部下側には、位置決め突起１９３が設けてある。例えば、位置決め突起１９３は、円柱状をなす金属性のピンである。ピンの一底面には底面によりも径の大きい皿上のベース部を設けてある。このベース部が、後面部１９１に設けられた貫通穴にカシメにより固定されことにより、位置決め突起１９３はヒートスプレッダ１９に固定される。また、図４、５、７及び８に示すように、後面部１９１の左端部下側には、右端部下側同様に、位置決め突起１９３が設けてある。位置決め突起の断面は円形断面を有している。上述したように、基板固定部１９２にはＬＥＤ基板１８が両面テープで固定される。 As shown in FIGS. 4, 5 and 8, the heat spreader 19 includes a plate-shaped rear surface portion 191 and a substrate fixing portion (plate-shaped portion) 192 which are orthogonal to each other, and the side view is L-shaped. A positioning protrusion 193 is provided below the right end portion of the rear surface portion 191. For example, the positioning protrusion 193 is a metallic pin having a cylindrical shape. A base portion on a plate having a larger diameter than the bottom surface is provided on one bottom surface of the pin. This base portion is fixed to a through hole provided in the rear surface portion 191 by caulking, whereby the positioning projection 193 is fixed to the heat spreader 19. As shown in FIGS. 4, 5, 7, and 8, a positioning protrusion 193 is provided on the lower side of the rear surface portion 191, similarly to the lower side of the right end portion. The cross section of the positioning protrusion has a circular cross section. As described above, the LED substrate 18 is fixed to the substrate fixing portion 192 with the double-sided tape.
　図３及び図１０に示すように、凹部１５１は位置決め突起１９３と当接している。凹部１５１の位置決め突起１９３との当接面１５１ａは、導光板１５のＬＥＤ基板１８と対向する側面（一側面）と平行としてある。凹部１５１の当接面１５１ａの両側には、一側面に連絡する端面１５１ｂ、１５１ｃが形成されている。当接面１５１ａと端面１５１ｂとの間の角部１５１ｄ、及び当接面１５１ａと端面１５１ｃとの間の角部１５１ｄは、円弧形の面取りが形成されている。 As shown in FIGS. 3 and 10, the recess 151 is in contact with the positioning protrusion 193. The contact surface 151 a of the recess 151 with the positioning protrusion 193 is parallel to the side surface (one side surface) of the light guide plate 15 facing the LED substrate 18. End surfaces 151b and 151c are formed on both sides of the contact surface 151a of the recess 151 so as to communicate with one side surface. The corner portion 151d between the contact surface 151a and the end surface 151b and the corner portion 151d between the contact surface 151a and the end surface 151c are formed with arc-shaped chamfers.
　図１０は定常温度である場合の状態（定常状態）における凹部１５１と位置決め突起１９３との位置関係を示している。図１０は右下角部を示している。ここで、定常温度とは、液晶テレビ１の内部温度がほぼ一定に保たれている場合の温度をいう。定常状態では、位置決め突起１９３は、導光板１５の凹部１５１の当接面１５１ａの中央付近で当接する位置にある。図１０は導光板１５の右下部分を示しているが、導光板１５の左下角部も、図１０と同様な状態となっている。 FIG. 10 shows the positional relationship between the recess 151 and the positioning protrusion 193 in a state (steady state) when the temperature is constant. FIG. 10 shows the lower right corner. Here, the steady temperature refers to a temperature when the internal temperature of the liquid crystal television 1 is kept substantially constant. In the steady state, the positioning protrusion 193 is in a position where it abuts near the center of the abutment surface 151 a of the recess 151 of the light guide plate 15. FIG. 10 shows the lower right portion of the light guide plate 15, but the lower left corner of the light guide plate 15 is also in the same state as in FIG.
　図１１は弾性部材２０１の配置を示す説明図である。図１１はバックライトシャーシ２０の右上角部を示している。図１１に示すように導光板１５の右上角部近傍には、バックライトシャーシ２０に固定された弾性部材２０１が配されている。同様に、左角部近傍にも弾性部材２０１が配されている。弾性部材２０１は、マイクロセルポリマー、ウレタンフォーム、ゴム、シリコンなどをシート状に形成したものを適当な大きさに切り出したものである。導光板１５と弾性部材２０１とには、わずかな隙間が設けている。この隙間は、導光板１５をバックライトシャーシ２０に載置する際の作業性を効率化させるためである。 FIG. 11 is an explanatory view showing the arrangement of the elastic member 201. FIG. 11 shows the upper right corner of the backlight chassis 20. As shown in FIG. 11, an elastic member 201 fixed to the backlight chassis 20 is disposed near the upper right corner of the light guide plate 15. Similarly, an elastic member 201 is also provided near the left corner. The elastic member 201 is obtained by cutting out a microcell polymer, urethane foam, rubber, silicon, or the like formed into a sheet shape into an appropriate size. A slight gap is provided between the light guide plate 15 and the elastic member 201. This gap is for improving the workability when the light guide plate 15 is placed on the backlight chassis 20.
　導光板１５のバックライトシャーシ２０上下方向の位置決めは、凹部１５１、位置決め突起１９３、弾性部材２０１により行われる。導光板１５のバックライトシャーシ２０左右方向の位置決めについては、弾性部材２０１により行われる。 The positioning of the light guide plate 15 in the vertical direction of the backlight chassis 20 is performed by the recess 151, the positioning protrusion 193, and the elastic member 201. The positioning of the light guide plate 15 in the left-right direction of the backlight chassis 20 is performed by the elastic member 201.
　次に導光板１５が熱膨張する場合について説明する。図１２は導光板１５の凹部１５１とヒートスプレッダ１９が備える位置決め突起１９３との位置関係を示す説明図である。図１２は導光板１５の右下角部を示している。図１２は液晶テレビ１の内部温度が設計の上限（例えば６０度）となり、導光板１５が熱膨張した場合を示している。図１２に示すように、導光板１５が熱膨張した場合は、位置決め突起１９３が凹部１５１の角部１５１ｄに当接する。導光板１５の左下角部も図１２と同様な状態となる。このように、導光板１５が熱膨張した場合においては、導光板１５の下縁左右に設けた凹部１５１とヒートスプレッダ１９が備える位置決め突起１９３とにより、導光板１５の左右方向の位置決めがされるため、導光板１５の中央位置を保つことが可能となる。導光板１５の膨張に伴いミドルシャーシ１４の位置が外部方向に移動するが、移動した分、弾性部材２０１が収縮するため、導光板１５全体が湾曲することはない。 Next, the case where the light guide plate 15 is thermally expanded will be described. FIG. 12 is an explanatory diagram showing the positional relationship between the concave portion 151 of the light guide plate 15 and the positioning protrusion 193 provided in the heat spreader 19. FIG. 12 shows the lower right corner of the light guide plate 15. FIG. 12 shows a case where the internal temperature of the liquid crystal television 1 becomes the upper limit of design (for example, 60 degrees) and the light guide plate 15 is thermally expanded. As shown in FIG. 12, when the light guide plate 15 is thermally expanded, the positioning protrusion 193 contacts the corner 151 d of the recess 151. The lower left corner of the light guide plate 15 is also in the same state as in FIG. Thus, when the light guide plate 15 is thermally expanded, the light guide plate 15 is positioned in the left-right direction by the recesses 151 provided on the left and right sides of the lower edge of the light guide plate 15 and the positioning protrusions 193 provided in the heat spreader 19. The center position of the light guide plate 15 can be maintained. As the light guide plate 15 expands, the position of the middle chassis 14 moves outward. However, since the elastic member 201 contracts by the amount of movement, the entire light guide plate 15 is not curved.
　図１３は導光板１５の凹部１５１とヒートスプレッダ１９が備える位置決め突起１９３との位置関係を示す説明図である。図１３は導光板１５の右下角部を示している。図１３は液晶テレビ１の内部温度が設計の下限（例えば－４０度）となり、導光板１５が熱収縮した場合を示している。図１３に示すように、導光板１５が熱収縮した場合は、位置決め突起１９３が凹部１５１の角部１５１ｄに当接する。導光板１５の左下角部も図１３と同様な状態となる。このように、導光板１５が熱収縮した場合においては、導光板１５の下縁左右に設けた凹部１５１とヒートスプレッダ１９が備える位置決め突起１９３とにより、導光板１５の左右方向の位置決めがされるため、導光板１５の中央位置を保つことが可能となる。導光板１５の収縮に伴いミドルシャーシ１４と導光板１５の隙間が生じる虞があるが、その分、弾性部材２０１が復元するため、大きながたつきを隙間が生じることはない。 FIG. 13 is an explanatory view showing the positional relationship between the concave portion 151 of the light guide plate 15 and the positioning protrusion 193 provided in the heat spreader 19. FIG. 13 shows the lower right corner of the light guide plate 15. FIG. 13 shows a case where the internal temperature of the liquid crystal television 1 becomes the lower limit of design (for example, −40 degrees) and the light guide plate 15 is thermally contracted. As shown in FIG. 13, when the light guide plate 15 is thermally contracted, the positioning protrusion 193 comes into contact with the corner 151 d of the recess 151. The lower left corner of the light guide plate 15 is also in the same state as in FIG. Thus, when the light guide plate 15 is thermally contracted, the light guide plate 15 is positioned in the left-right direction by the recesses 151 provided on the left and right sides of the lower edge of the light guide plate 15 and the positioning protrusions 193 provided in the heat spreader 19. The center position of the light guide plate 15 can be maintained. There is a possibility that a gap between the middle chassis 14 and the light guide plate 15 is generated as the light guide plate 15 contracts. However, since the elastic member 201 is restored to that extent, there is no gap between the large shakiness.
　また、位置決め突起１９３は円柱状としているから、位置決め突起１９３と当接面１５１ａとは、点接触となる。それにより、導光板１５が熱膨張又は熱収縮する場合でも、当接面１５１ａは位置決め突起１９３を滑ることが可能となる。さらにまた、角部１５１ｄの曲率半径は、位置決め突起１９３の断面円の半径よりも少し大きくしてあるから、位置決め突起１９３と角部１５１ｄとの接触も点接触となる。 Further, since the positioning protrusion 193 is cylindrical, the positioning protrusion 193 and the contact surface 151a are in point contact. Thereby, even when the light guide plate 15 is thermally expanded or contracted, the contact surface 151a can slide on the positioning protrusion 193. Furthermore, since the radius of curvature of the corner portion 151d is slightly larger than the radius of the cross-sectional circle of the positioning projection 193, the contact between the positioning projection 193 and the corner portion 151d is also a point contact.
　一方、凹部１５１の当接面１５１ａを、ＬＥＤ基板１と対向する側面（一側面）と平行としてある。それにより、位置決め突起１９３の当接面１５１ａとの接触位置が変化したとしても、ＬＥＤ基板１８とそれに対向する導光板１５の一側面との隙間は一定となる。また、位置決め突起１９３が角部１５１ｄで接触している場合も、隙間は所定の範囲内に納まる。したがって、導光板１５が熱膨張又は熱収縮したとしても、ＬＥＤ基板１８から導光板１５への入射光の光量は大きく変化することはないので、輝度低下などの表示品位の低下を防ぐことが可能となる。 On the other hand, the contact surface 151 a of the recess 151 is parallel to the side surface (one side surface) facing the LED substrate 1. Thereby, even if the contact position of the positioning protrusion 193 with the contact surface 151a changes, the gap between the LED substrate 18 and one side surface of the light guide plate 15 facing it is constant. Further, when the positioning protrusion 193 is in contact with the corner portion 151d, the gap is within a predetermined range. Therefore, even if the light guide plate 15 is thermally expanded or contracted, the amount of incident light from the LED substrate 18 to the light guide plate 15 does not change greatly, and thus it is possible to prevent display quality deterioration such as luminance reduction. It becomes.
　上述のように、実施の形態１では、導光板１５が熱収縮又は熱膨張した場合であっても、導光板１５の左右方向の中心位置にずれが発生せず、導光板１５とＬＥＤ基板１８との隙間寸法も変化しない。導光板１５が熱収縮又は熱膨張した場合であっても、導光板１５はＬＥＤ基板１８から光を適切に液晶表示パネル１２に出射することが可能となる。また、導光板１５は熱収縮時又は熱膨張時であっても、凹部１５１は位置決め突起１９３と当接し、下支えされているので、導光板１５が下に脱落するのを防ぐことが可能となる。 As described above, in the first embodiment, even if the light guide plate 15 is thermally contracted or thermally expanded, no deviation occurs in the center position in the left-right direction of the light guide plate 15, and the light guide plate 15 and the LED substrate 18. There is no change in the gap size. Even when the light guide plate 15 is thermally contracted or thermally expanded, the light guide plate 15 can appropriately emit light from the LED substrate 18 to the liquid crystal display panel 12. Further, even when the light guide plate 15 is in thermal contraction or thermal expansion, the concave portion 151 contacts and is supported by the positioning projection 193, so that the light guide plate 15 can be prevented from dropping down. .
　さらにまた、ＬＥＤ基板１８及び導光板１５は、ヒートスプレッダ１９に固定されているため、ＬＥＤ基板１８との導光板１５の下側面との間隔が適切となるように、導光板１５を組み付けるのが容易である。ＬＥＤ基板１８はヒートスプレッダ１９に固定され、導光板１５はバックライトシャーシ２０に固定され、ヒートスプレッダ１９はバックライトシャーシ２０に固定されている場合、各部品同士の組み付け誤差が、ＬＥＤ基板１８との導光板１５の下側面との間隔の誤差に大きく影響する。しかし、ＬＥＤ基板１８及び導光板１５が、同一部品（ヒートスプレッダ１９）に組み付けられる場合の誤差は、ＬＥＤ基板１８をヒートスプレッダ１９に取り付け際の誤差、導光板１５をヒートスプレッダ１９により位置決めする際の誤差であり、誤差の要因が少なくなるからである。 Furthermore, since the LED substrate 18 and the light guide plate 15 are fixed to the heat spreader 19, it is easy to assemble the light guide plate 15 so that the distance between the LED substrate 18 and the lower surface of the light guide plate 15 is appropriate. It is. When the LED board 18 is fixed to the heat spreader 19, the light guide plate 15 is fixed to the backlight chassis 20, and the heat spreader 19 is fixed to the backlight chassis 20, an assembly error between the components causes the LED board 18 to be introduced. This greatly affects the error in the distance from the lower surface of the optical plate 15. However, the error when the LED board 18 and the light guide plate 15 are assembled to the same component (heat spreader 19) is an error when the LED board 18 is attached to the heat spreader 19, and an error when the light guide plate 15 is positioned by the heat spreader 19. This is because the cause of error is reduced.
　なお、導光板１５の凹部１５１の角部１５１ｄの曲率は、位置決め突起１９３の外周面の曲率よりも、わずかに大きくしてある。例えば、位置決め突起１９３の半径が１．５ｍｍ（直径３ｍｍ）の場合、角部１５１ｄの曲率半径は、１．７ｍｍが好適である。曲率半径にわずかな差を設けているのは、位置決め突起１９３と角部１５１ｄとを点接触させるためである。位置決め突起１９３と角部１５１ｄの接触面積が大きくなると、熱膨張又は熱収縮から導光板１５通常の状態に戻る際に、位置決め突起１９３が角部１５１ｄから離れず、導光板１５の破損や位置ずれを起こす可能性があるからである。 It should be noted that the curvature of the corner portion 151 d of the concave portion 151 of the light guide plate 15 is slightly larger than the curvature of the outer peripheral surface of the positioning protrusion 193. For example, when the radius of the positioning protrusion 193 is 1.5 mm (diameter 3 mm), the curvature radius of the corner portion 151d is preferably 1.7 mm. The reason why a slight difference is provided in the radius of curvature is to make point contact between the positioning protrusion 193 and the corner portion 151d. When the contact area between the positioning projection 193 and the corner portion 151d increases, the positioning projection 193 does not move away from the corner portion 151d when the light guide plate 15 returns to the normal state from thermal expansion or thermal contraction, and the light guide plate 15 is damaged or displaced. Because there is a possibility of causing.
（実施の形態２）
　実施の形態２では、導光板１５に設ける凹部１５１の形状が異なる。実施の形態２と実施の形態１との相違は凹部１５１の形状である。以下の説明おいては相違について主に説明し、実施の形態１と同様なその他の構成については説明を省略する。 (Embodiment 2)
In the second embodiment, the shape of the recess 151 provided in the light guide plate 15 is different. The difference between the second embodiment and the first embodiment is the shape of the recess 151. In the following description, differences are mainly described, and description of other configurations similar to those of the first embodiment is omitted.
　図１４は実施の形態２に係る導光板１５の部分平面図である。図１４は導光板の右下角部を示している。実施の形態２では、実施の形態１とは異なり、凹部１５１右側の端面１５１ｃが左側の端面１５１ｂよりも、短いことが特徴である。右側の端面１５１ｃは、左側の端面１５１ｂよりも、寸法ｈだけ短くしてある。 FIG. 14 is a partial plan view of the light guide plate 15 according to the second embodiment. FIG. 14 shows the lower right corner of the light guide plate. Unlike the first embodiment, the second embodiment is characterized in that the right end surface 151c of the recess 151 is shorter than the left end surface 151b. The right end surface 151c is shorter than the left end surface 151b by a dimension h.
　図１５は実施の形態２に係る導光板１５の凹部１５１とヒートスプレッダ１９が備える位置決め突起１９３との位置関係を示す説明図である。図１５は導光板１５が熱収縮した場合を示している。位置決め突起１９３は、凹部１５１の角部１５１ｄと当接している。図１５に示すように、位置決め突起１９３が角部１５１ｄと当接している場合において、端面１５１ｄの下端部１５２ｂは、位置決め突起１９３の断面円の中心よりも、寸法ｄだけ下に位置している。 FIG. 15 is an explanatory diagram showing a positional relationship between the concave portion 151 of the light guide plate 15 according to the second embodiment and the positioning protrusion 193 provided in the heat spreader 19. FIG. 15 shows a case where the light guide plate 15 is thermally contracted. The positioning protrusion 193 is in contact with the corner 151 d of the recess 151. As shown in FIG. 15, when the positioning projection 193 is in contact with the corner portion 151 d, the lower end portion 152 b of the end surface 151 d is positioned below the center of the sectional circle of the positioning projection 193 by the dimension d. .
　凹部１５１の端面１５１ｄの下端部１５２ｂを、凹部１５１よりも左右方向中央側の導光板１５の下端部１５２ａよりも上側の位置としたのは、導光板１５の右下角が破損することをさけるためである。当該部分は左右方向の幅が小さいため、組立時に他の部品や治具と干渉して、破損するおそれがある。また、下端部１５２ｂは、ＬＥＤの光が入射する面ではないので、上側の位置としても導光板１５の機能には影響しない。しかし、あまり上側にし過ぎると、位置決め突起１９３が凹部１５１に当接せずに、位置決め突起１９３より脱落するおそれがある。そのため、上述したように、下端部１５２ｂを位置決め突起１９３の断面円の中心よりも下に位置するように構成している。 The reason why the lower end portion 152b of the end surface 151d of the recess 151 is positioned above the lower end portion 152a of the light guide plate 15 on the center side in the left-right direction with respect to the recess 151 is to prevent the lower right corner of the light guide plate 15 from being damaged. It is. Since this portion has a small width in the left-right direction, it may be damaged by interference with other parts and jigs during assembly. Moreover, since the lower end part 152b is not a surface on which the light of the LED is incident, the function of the light guide plate 15 is not affected even if it is positioned on the upper side. However, if the position is too high, the positioning protrusion 193 may not come into contact with the recess 151 and may fall off the positioning protrusion 193. Therefore, as described above, the lower end portion 152b is configured to be positioned below the center of the cross-sectional circle of the positioning protrusion 193.
　上述のように実施の形態２に係る液晶テレビ１は、実施の形態１で示した効果に加えて、次のような効果を奏する。実施の形態２に係る液晶テレビ１は、導光板１５の凹部１５１右側の端面１５１ｃが左側の端面１５１ｂよりも、短くなるように構成したので、組立時に導光板１５の右下角が破損することを防ぐことが可能となる。 As described above, the liquid crystal television 1 according to the second embodiment has the following effects in addition to the effects shown in the first embodiment. Since the liquid crystal television 1 according to Embodiment 2 is configured such that the end surface 151c on the right side of the recess 151 of the light guide plate 15 is shorter than the end surface 151b on the left side, the lower right corner of the light guide plate 15 is damaged during assembly. It becomes possible to prevent.
（実施の形態３）
　実施の形態３に係る液晶テレビ１は、導光板１５の上下方向の中央位置にずれが生じない構成を備える。図１６は実施の形態３に係る液晶テレビ１のＬＥＤ基板１８の配置を示すための説明図である。実施の形態３では、ＬＥＤ基板１８は導光板１５の平行な２つの側面を挟むように、上下に配置されている。ＬＥＤ基板１８を２枚有することにより、画面の輝度を高めることが可能となる。その一方で、導光板１５が熱収縮又は熱膨張した場合においては、導光板１５の上下方向の中央位置をずれないようにすることが必要となる。導光板１５の上下方向の中央位置がずれた場合、導光板１５の一側面と下側のＬＥＤ基板１８との距離、及び導光板１５の一側面と平行な側面と上側のＬＥＤ基板１８との距離に差が生じる。この場合、一方のＬＥＤ基板１８から導光板１５に入射する光の光量と、他方のＬＥＤ基板１８から導光板１５に入射する光の光量とに差が生じる。それにより、液晶表示パネル全体で輝度ムラが発生してしまう。そのため、実施の形態３に係る液晶テレビ１では、導光板１５の上下方向の中央位置をずれないようにする構成が必要となる。 (Embodiment 3)
The liquid crystal television 1 according to Embodiment 3 has a configuration in which a shift does not occur at the center position in the vertical direction of the light guide plate 15. FIG. 16 is an explanatory diagram for illustrating an arrangement of the LED substrate 18 of the liquid crystal television 1 according to the third embodiment. In the third embodiment, the LED substrates 18 are arranged vertically so as to sandwich two parallel side surfaces of the light guide plate 15. By having two LED boards 18, it is possible to increase the brightness of the screen. On the other hand, when the light guide plate 15 is thermally contracted or expanded, it is necessary not to shift the center position of the light guide plate 15 in the vertical direction. When the center position of the light guide plate 15 in the vertical direction is shifted, the distance between one side surface of the light guide plate 15 and the lower LED substrate 18, and the side surface parallel to one side surface of the light guide plate 15 and the upper LED substrate 18. There is a difference in distance. In this case, there is a difference between the amount of light incident on the light guide plate 15 from one LED substrate 18 and the amount of light incident on the light guide plate 15 from the other LED substrate 18. As a result, luminance unevenness occurs in the entire liquid crystal display panel. For this reason, the liquid crystal television 1 according to Embodiment 3 needs to be configured so as not to shift the vertical center position of the light guide plate 15.
　図１７は実施の形態３に係る導光板１５の右側部を示す部分平面図である。導光板１５の右側面には凹部１５３が設けてある。凹部１５３は導光板１５を平面視半円状に切り欠いた形状としてある。凹部１５３は導光板１５の上下方向の略中央に設けてある。 FIG. 17 is a partial plan view showing the right side portion of the light guide plate 15 according to the third embodiment. A concave portion 153 is provided on the right side surface of the light guide plate 15. The recess 153 has a shape in which the light guide plate 15 is cut out in a semicircular shape in plan view. The recess 153 is provided at the approximate center of the light guide plate 15 in the vertical direction.
　バックライトシャーシ２０には、凹部１５３と対応する位置に位置決め突起２０２が設けてある。位置決め突起２０２は円柱状をなし、導光板１５の裏側から表側に向かって突出している。位置決め突起２０２は、バックライトシャーシ２０の上下方向の略中央に設けてある。位置決め突起２０２は、凹部１５３に嵌合する。それにより、導光板１５の上下方向の位置決めがされる。また、導光板１５が熱収縮又は熱膨張した時であっても、導光板１５の上下方向の中央位置がずれてしまうことを防ぐことが可能となる。 The backlight chassis 20 is provided with positioning protrusions 202 at positions corresponding to the recesses 153. The positioning protrusion 202 has a cylindrical shape and protrudes from the back side of the light guide plate 15 toward the front side. The positioning protrusion 202 is provided at the approximate center of the backlight chassis 20 in the vertical direction. The positioning protrusion 202 is fitted in the recess 153. Thereby, the light guide plate 15 is positioned in the vertical direction. Further, even when the light guide plate 15 is thermally contracted or expanded, it is possible to prevent the center position in the vertical direction of the light guide plate 15 from being shifted.
　実施の形態３に係る液晶テレビ１は、ＬＥＤ基板１８が導光板１５の平行な２つの側面と対向する構造の場合であって、導光板１５が熱収縮又は熱膨張したときでも、当該２つの側面の対向方向の中心位置がずれることがない。それにより、液晶表示パネル１２に照射する光の光量にムラが発生することを防ぐことが可能となる。 The liquid crystal television 1 according to the third embodiment has a structure in which the LED substrate 18 is opposed to two parallel side surfaces of the light guide plate 15, and even when the light guide plate 15 is thermally contracted or expanded, the two The center position of the side surface in the opposing direction does not shift. Thereby, it is possible to prevent the occurrence of unevenness in the amount of light applied to the liquid crystal display panel 12.
　なお、凹部１５３と位置決め突起２０２とは、液晶テレビ１の右側に設けてあるが、液晶テレビ１の左側に設けても良い。また、実施の形態１のように、導光板１５の下側両端に凹部１５１を設け、ヒ－トスプレッダ１９の左右両側端部の下側に位置決め突起１９３を設ける構成としても良い。 The concave portion 153 and the positioning projection 202 are provided on the right side of the liquid crystal television 1, but may be provided on the left side of the liquid crystal television 1. Further, as in the first embodiment, the recesses 151 may be provided at both lower ends of the light guide plate 15, and the positioning protrusions 193 may be provided below the left and right end portions of the heat spreader 19.
　各実施例で記載されている技術的特徴（構成要件）はお互いに組合せ可能であり、組み合わせすることにより、新しい技術的特徴を形成することができる。
　今回開示された実施の形態はすべての点で例示であって、制限的なものでは無いと考えられるべきである。本発明の範囲は、上記した意味では無く、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。 The technical features (components) described in each embodiment can be combined with each other, and new technical features can be formed by combining them.
The embodiments disclosed herein are illustrative in all respects and should not be considered as restrictive. The scope of the present invention is defined not by the above-described meaning but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.
　本発明に係る表示装置（１）は、前側で映像を表示する表示パネル（１２）と、矩形板状をなし、前記表示パネルの後側に一広面を対向させて配された導光板（１５）と、一面に発光素子が実装してある基板（１８）と、前記導光板の一側面と平行な板状部（１９２）を有し、該板状部に前記基板を、前記一側面に前記発光素子の実装面を対向させて固定してある放熱体（１９）とを備え、前記導光板は、前記発光素子から前記一側面に入射する光を前記一広面から出射して前記表示パネルに照射するようにしてある表示装置において、前記放熱体は、前記板状部から離れた位置に、前記一側面と略平行をなして突設された２つの位置決め突起（１９３）を備え、前記導光板は、前記一側面の両端部を切り欠いて形成され、前記位置決め突起の夫々と当接する当接面（１５１ａ）を有する被位置決め部（１５１）が設けてあることを特徴とする。 The display device (1) according to the present invention includes a display panel (12) that displays an image on the front side, a rectangular plate shape, and a light guide plate (15) that is arranged with a wide surface facing the rear side of the display panel. ), A substrate (18) having a light emitting element mounted on one surface, and a plate-like portion (192) parallel to one side surface of the light guide plate, the substrate on the plate-like portion, and the one side surface A heat dissipating body (19) fixed so that the mounting surface of the light emitting element is opposed, and the light guide plate emits light incident on the one side surface from the light emitting element from the one wide surface, and the display panel In the display device configured to irradiate, the heat dissipator includes two positioning protrusions (193) that protrude from the plate-like portion so as to be substantially parallel to the one side surface. The light guide plate is formed by cutting out both end portions of the one side surface, and the positioning protrusion Characterized in that the positioning unit (151) is provided with an abutment surface in contact with the respective person (151a).
　本発明においては、放熱体に２つの位置決め突起を備え、導光板には位置決め突起の夫々と当接する当接面を有する被位置決め部を設けている。それにより、導光板が熱収縮又は熱膨張しても、導光板の一側面に沿う方向の中央位置がずれることを防ぐことが可能となる。 In the present invention, the radiator is provided with two positioning projections, and the light guide plate is provided with a positioned portion having a contact surface that contacts each of the positioning projections. Thereby, even if the light guide plate is thermally contracted or expanded, it is possible to prevent the center position in the direction along one side surface of the light guide plate from being shifted.
　本発明に係る表示装置は、前記位置決め突起は、円形断面を有しており、前記被位置決め部は、前記一側面と平行をなす前記当接面と、該当接面の両側を前記一側面に連絡する端面（１５１ｂ、１５１ｃ）とを含む矩形断面の切欠き部であって、前記当接面と前記端面との間の角部（１５１ｄ、１５１ｄ）には、前記位置突起よりも径の大きい円弧形の面取りが形成してあることを特徴とする。 In the display device according to the present invention, the positioning protrusion has a circular cross section, and the positioned portion includes the contact surface parallel to the one side surface, and both sides of the corresponding contact surface on the one side surface. It is a notch part of the rectangular cross section containing the end surface (151b, 151c) to communicate, Comprising: The corner | angular part (151d, 151d) between the said contact surface and the said end surface has a diameter larger than the said position protrusion An arc-shaped chamfer is formed.
　本発明においては、被位置決め部の当接面を一側面と平行としたので、導光板が熱収縮又は熱膨張しても、導光板の一側面と発光素子との距離を一定に保つことが可能となる。 In the present invention, since the contact surface of the positioned portion is parallel to one side surface, the distance between one side surface of the light guide plate and the light emitting element can be kept constant even when the light guide plate is thermally contracted or thermally expanded. It becomes possible.
　本発明に係る表示装置は、前記当接面の両側の端面のうち、前記導光板の端部側に位置する端面は、逆側に位置する端面よりも短くしてあることを特徴とする。 The display device according to the present invention is characterized in that, of the end surfaces on both sides of the contact surface, the end surface located on the end side of the light guide plate is shorter than the end surface located on the opposite side.
　本発明においては、導光板の端部側に位置する端面は、逆側に位置する端面よりも短くしてあるので、組立時に導光板を破損することを防ぐことが可能となる。 In the present invention, since the end face located on the end side of the light guide plate is shorter than the end face located on the opposite side, it is possible to prevent the light guide plate from being damaged during assembly.
　本発明に係る表示装置は、前記導光板の周縁部を覆う箱体状の保持体（２０）と、前記導光板の前記一端面と平行な他の端面と対向し、発光素子が一面に実装してある基板（１９）とを更に備え、前記保持枠体には、前記導光板の前記基板と対向しない側面の一方と略平行をなして突設された位置決め突起（２０２）を備え、前記導光板は、前記側面の一方を切り欠いて形成され、前記位置決め突起と当接する当接面を有する被位置決め部（１５３）が設けてあることを特徴とする。 The display device according to the present invention has a box-shaped holding body (20) covering a peripheral edge of the light guide plate, and another end face parallel to the one end face of the light guide plate, and the light emitting element is mounted on one surface. And the holding frame body includes a positioning projection (202) provided so as to project substantially parallel to one of the side surfaces of the light guide plate not facing the substrate, The light guide plate is formed by notching one of the side surfaces, and is provided with a positioned portion (153) having a contact surface that contacts the positioning protrusion.
　本発明においては、発光素子が実装してある基板をさらに備え、保持体には、導光板の基板と対向しない側面の一方と略平行に突出する位置決め部が設けてある。導光板の基板と対向しない側面の一方には、位置決め部が緩挿する切り欠き状の被位置決め部が設けてある。それにより、導光板が熱収縮又は熱膨張しても、導光板と基板とが対向する方向の導光板の中央位置がずれてしまうことを防ぐことが可能となる。 In the present invention, the substrate further includes a substrate on which the light emitting element is mounted, and the holding body is provided with a positioning portion that protrudes substantially parallel to one of the side surfaces not facing the substrate of the light guide plate. On one side surface of the light guide plate that does not face the substrate, a notch-shaped portion to be positioned into which the positioning portion is gently inserted is provided. Thereby, even if the light guide plate is thermally contracted or expanded, it is possible to prevent the center position of the light guide plate in the direction in which the light guide plate and the substrate face each other from being shifted.
　本発明に係るテレビジョン受信機は、上述に記載の表示装置と、テレビジョン放送を受信する受信部とを備え、前記受信部にて受信したテレビジョン放送に基づいて、前記表示装置に映像を表示するようにしてあることを特徴とする。 A television receiver according to the present invention includes the display device described above and a receiving unit that receives a television broadcast, and displays video on the display device based on the television broadcast received by the receiving unit. It is characterized by being displayed.
　本発明においては、放熱体に２つの位置決め突起を備え、導光板には位置決め突起の夫々と当接する当接面を有する被位置決め部を設けている。それにより、導光板が熱収縮又は熱膨張しても、導光板の一側面に沿う方向の中央位置がずれることを防ぐことが可能となる。 In the present invention, the radiator is provided with two positioning projections, and the light guide plate is provided with a positioned portion having a contact surface that contacts each of the positioning projections. Thereby, even if the light guide plate is thermally contracted or expanded, it is possible to prevent the center position in the direction along one side surface of the light guide plate from being shifted.
　１　液晶テレビ（表示装置）
　１１　フロントフレーム
　１２　液晶表示パネル（表示パネル）
　１３　光学シート
　１４　ミドルシャーシ
　１５　導光板
　１５１、１５３　凹部（被位置決め部）
　１５１ａ　当接面
　１５１ｂ、１５１ｃ　端面
　１５２ａ、１５２ｂ　下端部
　１５１ｄ　角部
　１６　反射シート
　１７　導光板ホルダ
　１８　ＬＥＤ基板（基板）
　１９　ヒートスプレッダ（放熱体）
　１９１　後面部
　１９２　基板固定部（板状部）
　１９３、２０２　位置決め突起
　２０　バックライトシャーシ（保持体）
　２１　チューナ部（受信部）
　３　スタンド
　４　スピーカユニット 1 LCD TV (display device)
11 Front frame 12 Liquid crystal display panel (display panel)
13 Optical sheet 14 Middle chassis 15 Light guide plate 151, 153 Recessed part (positioned part)
151a Contact surface 151b, 151c End surface 152a, 152b Lower end part 151d Corner part 16 Reflective sheet 17 Light guide plate holder 18 LED board (board | substrate)
19 Heat spreader
191 Rear surface part 192 Substrate fixing part (plate-like part)
193, 202 Positioning projection 20 Backlight chassis (holding body)
21 Tuner (Receiver)
3 Stand 4 Speaker unit

Claims (5)

  1. 　前側で映像を表示する表示パネルと、
    　矩形板状をなし、前記表示パネルの後側に一広面を対向させて配された導光板と、
    　一面に発光素子が実装してある基板と、
    　前記導光板の一側面と平行な板状部を有し、該板状部に前記基板を、前記一側面に前記発光素子の実装面を対向させて固定してある放熱体とを備え、
    　前記導光板は、前記発光素子から前記一側面に入射する光を前記一広面から出射して前記表示パネルに照射するようにしてある表示装置において、
    　前記放熱体は、前記板状部から離れた位置に、前記一側面と略平行をなして突設された２つの位置決め突起を備え、
    　前記導光板は、前記一側面の両端部を切り欠いて形成され、前記位置決め突起の夫々と当接する当接面を有する被位置決め部が設けてある
    　ことを特徴とする表示装置。     A display panel for displaying images on the front side;
    A light guide plate arranged in a rectangular plate shape with a wide surface facing the rear side of the display panel;
    A substrate having a light emitting element mounted on one surface;
    A plate-like portion parallel to one side surface of the light guide plate, and the radiator, wherein the substrate is fixed to the plate-like portion, and the mounting surface of the light-emitting element is fixed to the one side surface,
    In the display device, the light guide plate emits light incident on the one side surface from the light emitting element to irradiate the display panel from the one wide surface,
    The heat dissipating body includes two positioning protrusions that protrude from the plate-like portion so as to be substantially parallel to the one side surface.
    The display device, wherein the light guide plate is formed by notching both end portions of the one side surface, and a positioned portion having a contact surface that contacts each of the positioning protrusions is provided.
  2. 　前記位置決め突起は、円形断面を有しており、
    　前記被位置決め部は、前記一側面と平行をなす前記当接面と、該当接面の両側を前記一側面に連絡する端面とを含む矩形断面の切欠き部であって、
    　前記当接面と前記端面との間の角部には、前記位置突起よりも径の大きい円弧形の面取りが形成してある
    　ことを特徴とする請求項１に記載の表示装置。     The positioning protrusion has a circular cross section;
    The positioned portion is a notch portion having a rectangular cross section including the abutting surface that is parallel to the one side surface and end surfaces that connect both sides of the corresponding contacting surface to the one side surface,
    2. The display device according to claim 1, wherein an arc shape chamfer having a diameter larger than that of the position protrusion is formed at a corner between the contact surface and the end surface.
  3. 　前記当接面の両側の端面のうち、前記導光板の端部側に位置する端面は、逆側に位置する端面よりも短くしてある
    　ことを特徴とする請求項２に記載の表示装置。     3. The display device according to claim 2, wherein an end face located on an end portion side of the light guide plate among end faces on both sides of the contact face is shorter than an end face located on the opposite side.
  4. 　前記導光板の周縁部を覆う箱体状の保持体と、
    　前記導光板の前記一端面と平行な他の端面と対向し、発光素子が一面に実装してある基板とを更に備え、
    　前記保持体には、前記導光板の前記基板と対向しない側面の一方と略平行をなして突設された位置決め突起を備え、
    　前記導光板は、前記側面の一方を切り欠いて形成され、前記位置決め突起と当接する当接面を有する被位置決め部が設けてある
    　ことを特徴とする請求項１から３のいずれか１項に記載の表示装置。     A box-shaped holding body covering the peripheral edge of the light guide plate;
    A substrate on which the light emitting element is mounted on one surface, facing another end surface parallel to the one end surface of the light guide plate;
    The holding body includes a positioning protrusion that is provided so as to protrude substantially parallel to one of the side surfaces of the light guide plate that do not face the substrate,
    The said light guide plate is formed by notching one of the said side surfaces, and the to-be-positioned part which has the contact surface contact | abutted with the said positioning protrusion is provided. The display device described.
  5. 　請求項１から４のいずれか一つに記載の表示装置と、
    　テレビジョン放送を受信する受信部と
    　を備え、
    　前記受信部にて受信したテレビジョン放送に基づいて、前記表示装置に映像を表示するようにしてあること
    　を特徴とするテレビジョン受信機。     A display device according to any one of claims 1 to 4,
    A receiver for receiving television broadcasts,
    A television receiver, wherein an image is displayed on the display device based on the television broadcast received by the receiving unit.
PCT/JP2015/065640 2014-06-06 2015-05-29 Display device and television receiver device WO2015186638A1 (en)

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JP2014-117934 2014-06-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012023484A1 (en) * 2010-08-20 2012-02-23 シャープ株式会社 Lighting apparatus and display apparatus
WO2013005708A1 (en) * 2011-07-07 2013-01-10 シャープ株式会社 Illumination device, display device, and television reception device
WO2013073458A1 (en) * 2011-11-18 2013-05-23 シャープ株式会社 Illumination device, display device, and television reception device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012023484A1 (en) * 2010-08-20 2012-02-23 シャープ株式会社 Lighting apparatus and display apparatus
WO2013005708A1 (en) * 2011-07-07 2013-01-10 シャープ株式会社 Illumination device, display device, and television reception device
WO2013073458A1 (en) * 2011-11-18 2013-05-23 シャープ株式会社 Illumination device, display device, and television reception device

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