JP5749202B2 - Display device and television receiver - Google Patents

Description

  The present invention relates to a display device and a television receiver.

  In recent years, display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display devices to which thin display elements such as liquid crystal panels and plasma display panels are applied. Is possible. The liquid crystal display device requires a separate lighting device because the liquid crystal panel used for this does not emit light.

  In an illuminating device used for a liquid crystal display device or the like, heat is generated on a light source substrate on which the light source is mounted as the light source emits light. For this reason, it is required to effectively dissipate the heat generated on the light source substrate to the outside of the lighting device. For example, Patent Document 1 discloses a liquid crystal device including an edge light type illumination device that can effectively dissipate heat generated on a light source substrate to the outside.

JP 2010-170922 A

  By the way, in recent years, due to demands for reduction of manufacturing costs and further reduction in thickness, it has been considered to abolish the synthetic resin cabinet, which is the exterior part of the liquid crystal display unit, but the liquid crystal display device without such a cabinet. In this case, the frame that supports the liquid crystal panel is the same as the frame that constitutes the appearance of the liquid crystal display unit, and the frame is the accessible portion. And normally, a light source board | substrate is attached to this flame | frame directly or indirectly via a heat radiating member. For this reason, in a liquid crystal display device without a cabinet, heat generated on the light source substrate is easily transmitted to the frame, and the temperature of the frame is likely to rise, and the temperature of the frame serving as the accessible portion is excessively high. It became a problem. On the other hand, if the light source substrate is attached to the chassis side apart from the frame, it is difficult to position the light source substrate and to assemble the light source substrate because it is assembled in order from the liquid crystal panel side in the manufacturing process. There was a problem.

  Here, in the display device of Patent Document 1 described above, a sheet-like heat radiating plate that overlaps with the LED that is the light source and extends to the outside of the frame is arranged, so that the heat generated from the LED can be reduced. It is configured to escape to the outside. However, even if such a sheet-like heat radiating plate is applied to a liquid crystal display device that does not include a cabinet, problems such as an increase in the number of members and an increase in member costs are caused. In addition, in the manufacturing process, when trying to assemble in order from the liquid crystal panel side, the LED is assembled after the sheet-like heat radiating plate, so it is difficult to position the LED so as to overlap the radiating plate. As a result, it is difficult to assemble the LED.

  The present specification has been created in view of the above problems. In this specification, in a display device that does not include a cabinet, it is possible to provide a technology capable of realizing a configuration that can be easily assembled in a manufacturing process while preventing an excessively high temperature of a frame serving as a touchable part. Objective.

  The technology disclosed in this specification is arranged so as to overlap a light source, a display panel that performs display using light of the light source, and the display panel side opposite to the display surface side, An end face is arranged facing the light source, a light guide plate that guides light from the light source to the display panel side, and a chassis that is arranged on the opposite side of the display panel side with respect to the light guide plate; A frame that is disposed on the display surface side of the display panel and that accommodates the display panel, the light source, and the light guide plate between the chassis and the chassis, and has heat dissipation and is mounted on the chassis In addition, a heat dissipating member arranged away from the frame, one plate surface is attached to the heat dissipating member, the light source is disposed on the other plate surface, and provided on the light guide plate, Toward the chassis The present invention relates to a display device comprising: a protruding protrusion, and a positioning hole that is provided on the heat dissipation member and that positions the heat dissipation member between the light guide plate and the chassis by being fitted to the protrusion. .

  According to the display device as described above, since the heat radiating member is attached to the chassis and is separated from the frame, most of the heat generated on the light source substrate is transferred to the chassis via the heat radiating member, and is externally transmitted from the chassis. Since the heat is dissipated to the frame, the temperature rise of the frame can be suppressed. And in the manufacturing process, when assembling from the frame side in order, after assembling the light guide plate, the heat radiating member can be assembled with the positioning holes of the heat radiating member fitted to the protrusions of the light guide plate. Therefore, it is possible to suppress the displacement of the distance between the end face of the light guide plate and the light source disposed on the heat dissipation member via the light source substrate. As described above, in a display device that does not include a cabinet, it is possible to realize a configuration that can be easily assembled in the manufacturing process while preventing the temperature of the frame serving as the accessible portion from becoming excessively high. The positioning hole may be a hole shape or a notch shape.

The light guide plate has a light guide plate extending portion extending outward from an end surface thereof, the projection portion is provided in the light guide plate extending portion, and the heat dissipation member extends outward from the end portion. While having a thermal radiation member extension part, the positioning hole may be provided in this thermal radiation member extension part.
According to this configuration, since the light guide plate extending portion of the light guide plate and the heat radiating member extending portion of the heat radiating member are fitted and the heat radiating member is positioned, when positioning the heat radiating member in the manufacturing process, The positioning portion can be easily confirmed, and the light guide plate extending portion and the heat radiating member extending portion can be easily overlapped, so that positioning can be easily performed.

The positioning hole may be provided so as to penetrate the plate surface of the heat radiating member.
According to this configuration, in the manufacturing process, the positioning hole can be visually recognized from the chassis side (the side opposite to the side facing the protruding portion), so that the positioning can be easily performed.

The positioning hole may have a shape that regulates the protrusion in the thickness direction of the light source substrate by fitting the protrusion.
According to this configuration, since the protrusion is fitted into the positioning hole, the distance between the light source substrate and the light guide plate, that is, the distance between the light source and the end surface of the light guide plate is regulated. The distance between the two can be maintained constant, and the optical design of the display device can be improved.

The positioning hole may have a hole shape.
According to this configuration, since the protrusion is fitted into the positioning hole, the periphery of the protrusion is regulated by the positioning hole over the entire circumference, so that the displacement of the heat dissipation member with respect to the light guide plate is effectively suppressed. can do.

The protrusion may be provided with a screw hole along its axial direction.
According to this configuration, with the protrusions fitted in the positioning holes, the heat dissipation member is clamped between the light guide plate and the chassis using screws whose tops are larger than the positioning holes. By doing so, the heat radiating member can be more reliably fixed in the manufacturing process.

The heat dissipation member may be attached to the chassis by being screwed to the chassis.
According to this configuration, since the positioned heat dissipating member can be screwed and fixed to the chassis after the chassis is assembled, the heat dissipating member can be stabilized on the chassis.

The protrusion may be a cylindrical pin.
According to this structure, the specific shape of the projection part which can be easily fitted with the positioning hole can be provided.

The heat radiating member has a bottom surface portion whose plate surface is arranged along the plate surface of the chassis, and a side surface portion that rises perpendicularly from the bottom surface portion to the bottom surface portion, and is L-shaped in cross section. The light source substrate may be disposed on the side surface portion.
According to this structure, the specific structure of the heat radiating member for effectively transferring the heat generated on the light source substrate to the chassis side can be realized.

The heat radiating member may have an L shape in which the bottom surface portion extends from one end of the side surface portion to the center side of the light guide plate in a cross-sectional view.
According to this structure, the specific structure of the heat radiating member for making the heat generated on the light source substrate difficult to be transferred to the frame side can be realized.

  In the technology disclosed in this specification, a display device in which the display panel is a liquid crystal panel using liquid crystal is also novel and useful. A television receiver provided with the above display device is also new and useful.

  According to the technology disclosed in this specification, in a display device without a cabinet, it is possible to realize a structure that can be easily assembled in a manufacturing process while preventing an excessively high temperature of a frame serving as a touchable part. Technology can be provided.

1 is an exploded perspective view showing a schematic configuration of a television receiver TV and a liquid crystal display unit LDU according to Embodiment 1. FIG. Rear view of television receiver TV and liquid crystal display device 10 The exploded perspective view which shows schematic structure of the liquid crystal display unit LDU which comprises the liquid crystal display device 10. FIG. Sectional drawing which shows the cross-sectional structure along the short side direction of the liquid crystal display device 10. Sectional drawing which shows the cross-sectional structure along the long side direction of the liquid crystal display device 10. FIG. 4 is an enlarged cross-sectional view of the main part of the liquid crystal display device 10 in the vicinity of one LED unit LU. The perspective view which looked at the fitting mode of pin 16t and notch 19t from the back side The perspective view which looked at the fitting site | part of the pin 116t and the notch 119t from back side in Embodiment 2. FIG. Cross-sectional view of the main part of the fitting portion between the pin 116t and the notch 119t as viewed from the back side The perspective view which looked at the fitting part of pin 216t and notch 219t from the back side in Embodiment 3.

<Embodiment 1>
Embodiment 1 will be described with reference to the drawings. In the present embodiment, a liquid crystal display device (an example of a display device) 10 is illustrated. A part of each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn in a common direction in each drawing. Among these, the Y-axis direction coincides with the vertical direction, and the X-axis direction coincides with the horizontal direction. In addition, unless otherwise noted, the vertical direction is used as a reference for upper and lower descriptions.

  The television receiver TV includes a liquid crystal display unit LDU, various substrates PWB, MB, CTB attached to the back side (back side) of the liquid crystal display unit LDU, and main substrates PWB, MB, A cover member CV attached to cover the CTB and a stand ST are provided, and the display surface of the liquid crystal display unit LDU is held by the stand ST along the vertical direction (Y-axis direction). The liquid crystal display device 10 according to the present embodiment is obtained by removing at least a configuration for receiving a television signal (such as a tuner portion of the main board MB) from the television receiver TV having the above-described configuration. As shown in FIG. 2, the liquid crystal display unit LDU has a horizontally long rectangular shape (rectangular shape, longitudinal shape) as a whole, and includes a liquid crystal panel 11 that is a display panel and a backlight device 12 that is an external light source. These are configured to be integrally held by the frame 13 and the chassis 14 which are appearance members constituting the appearance of the liquid crystal display device 10. In addition, the chassis 14 according to the present embodiment constitutes a part of the appearance member and a part of the backlight device 12.

  First, the configuration of the back side of the liquid crystal display device 10 will be described. As shown in FIG. 2, a pair of stand attachment members STA extending along the Y-axis direction are paired at two positions spaced apart in the X-axis direction on the back surface of the chassis 14 that forms the external appearance of the back side of the liquid crystal display device 10. It is attached. These stand attachment members STA have a substantially channel shape in which the cross-sectional shape is open on the surface on the chassis 14 side, and a pair of support columns STb in the stand ST are inserted into a space held between the stand 14 and the chassis 14. It has become. A wiring member (such as an electric wire) connected to an LED substrate (an example of a light source substrate) 18 included in the backlight device 12 is passed through the space in the stand attachment member STA. The stand ST includes a pedestal part STa that is parallel to the X-axis direction and the Z-axis direction, and a pair of column parts STb that rise from the pedestal part STa along the Y-axis direction. The cover member CV is made of synthetic resin, and is attached so as to cover about half of the lower side shown in FIG. 2 on the back surface of the chassis 14 while traversing the pair of stand attachment members STA in the X-axis direction. Between the cover member CV and the chassis 14, there is a component storage space that can store components such as various substrates PWB, MB, and CTB described below.

  As shown in FIG. 2, the various substrates PWB, MB, and CTB include a power supply substrate PWB, a main substrate MB, and a control substrate CTB. The power supply substrate PWB can be said to be a power supply source of the liquid crystal display device 10 and supplies driving power to the other substrates MB and CTB and the LED (an example of a light source) 17 included in the backlight device 12. It is possible. Therefore, it can be said that the power supply substrate PWB also serves as the “LED drive substrate for driving the LED 17”. The main board MB has at least a tuner unit capable of receiving a television signal and an image processing unit (not shown) for processing the received television signal, and controls the processed image signal as follows. Output to the substrate CTB is possible. The main board MB receives an image signal from the image reproduction device when the liquid crystal display device 10 is connected to an external image reproduction device (not shown). It can be processed and output to the control board CTB. The control board CTB has a function of converting an image signal input from the main board into a liquid crystal driving signal and supplying the converted liquid crystal driving signal to the liquid crystal panel 11.

  As shown in FIG. 3, the liquid crystal display unit LDU that constitutes the liquid crystal display device 10 has its main components between a frame 13 that forms the front side appearance and a chassis 14 that forms the back side appearance. It is assumed that it is housed in a space. As described above, the frame 13 constitutes the front side appearance of the liquid crystal display device 10, and thus is a touchable part in the liquid crystal display device 10. The main components housed in the frame 13 and the chassis 14 include at least the liquid crystal panel 11, the optical member 15, the light guide plate 16, and the LED unit LU. Among these, the liquid crystal panel 11, the optical member 15, and the light guide plate 16 are held in a state of being sandwiched between the front frame 13 and the back chassis 14 in a state where they are stacked on each other. The backlight device 12 includes an optical member 15, a light guide plate 16, an LED unit LU, and a chassis 14, and is configured by removing the liquid crystal panel 11 and the frame 13 from the liquid crystal display unit LDU. A pair of LED units LU forming the backlight device 12 are arranged in the frame 13 and the chassis 14 so as to sandwich the light guide plate 16 from both sides in the short side direction (Y-axis direction). The LED unit LU includes an LED 17 that is a light source, an LED substrate 18 on which the LED 17 is mounted, and a heat dissipation member (heat spreader) 19 to which the LED substrate 18 is attached. Hereinafter, each component will be described.

  As shown in FIG. 3, the liquid crystal panel 11 has a horizontally long rectangular shape (rectangular shape, longitudinal shape) in a plan view, and a pair of glass substrates 11a and 11b having excellent translucency are provided with a predetermined gap. The liquid crystal is sealed between the two substrates 11a and 11b. One substrate (array substrate) 11b is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The other substrate (CF substrate) 11a has a color filter, a counter electrode, an alignment film, and the like in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement. Is provided. The liquid crystal panel 11 is placed on the front side of the optical member 15 to be described below, and the back side surface (the outer surface of the polarizing plate on the back side) is in close contact with the optical member 15 with almost no gap. . This prevents dust and the like from entering between the liquid crystal panel 11 and the optical member 15. The display surface 11c of the liquid crystal panel 11 includes a display area on the center side of the screen where images can be displayed, and a non-display area having a frame shape (frame shape) surrounding the display area on the outer peripheral edge side of the screen. Become. The liquid crystal panel 11 is connected to a control board CTB via a driver component for driving liquid crystal and a flexible board 26, and an image is displayed in a display area on the display surface 11c based on a signal input from the control board CTB. It has come to be. A polarizing plate (not shown) is disposed outside each of the substrates 11a and 11b.

  As shown in FIG. 3, the optical member 15 has a horizontally long rectangular shape when viewed from the same plane as the liquid crystal panel 11, and the size (short side dimension and long side dimension) is the same as that of the liquid crystal panel 11. Is done. The optical member 15 is placed so as to be laminated on the front side (light emitting side) of the light guide plate 16 described later, and is disposed in a state of being sandwiched between the liquid crystal panel 11 and the light guide plate 16 described above. Each of the optical members 15 is in the form of a sheet and three are stacked on top of each other. Specifically, the diffusion sheet 15a, the lens sheet (prism sheet) 15b, and the reflective polarizing sheet 15c are sequentially formed from the back side (light guide plate 16 side). Note that the three sheets 15a, 15b, and 15c have substantially the same size in a plan view.

  The light guide plate 16 is made of a synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate) having a refractive index sufficiently higher than that of air and substantially transparent (excellent translucency). As shown in FIG. 3, the light guide plate 16 has a horizontally long rectangular shape when viewed in a plan view, as in the liquid crystal panel 11 and the optical member 15, and has a plate shape that is thicker than the optical member 15. The long side direction on the surface coincides with the X-axis direction, the short side direction coincides with the Y-axis direction, and the plate thickness direction orthogonal to the main surface coincides with the Z-axis direction. The light guide plate 16 is laminated on the back side of the optical member 15 and is disposed so as to be sandwiched between the optical member 15 and the chassis 14. As shown in FIG. 4, the light guide plate 16 has at least a short side dimension larger than each short side dimension of the liquid crystal panel 11 and the optical member 15, and both end portions in the short side direction (long side direction). Are arranged so as to protrude outward from both end portions of the liquid crystal panel 11 and the optical member 15 (so as to be non-overlapping in a plan view). The light guide plate 16 is disposed in a form sandwiched in the Y-axis direction by a pair of LED units LU disposed on both sides in the short side direction, and light from the LED 17 is respectively received at both ends in the short side direction. It has been introduced. The light guide plate 16 has a function of raising and emitting the light from the LED 17 introduced from both ends in the short side direction so as to face the optical member 15 side (front side) while propagating inside. Note that light guide plate extending portions 16 s extending outward from the end surfaces are provided on both end surfaces on the short side of the light guide plate 16. The configuration of the light guide plate extension 16s will be described in detail later.

  Of the main surface of the light guide plate 16, the surface facing the front side (the surface facing the optical member 15) is a light emitting surface 16 a that emits internal light toward the optical member 15 and the liquid crystal panel 11. Of the outer peripheral end faces adjacent to the main surface of the light guide plate 16, both end faces on the long side that are long along the X-axis direction (both end faces that the both ends in the short side direction have) are LEDs 17 ( The LED board 18) and the LED board 18) are opposed to each other with a predetermined space therebetween, and these form a pair of light incident surfaces 16b on which light emitted from the LEDs 17 is incident. As shown in FIG. 4, a reflective sheet 20 is provided on the back side of the light guide plate 16, that is, on the opposite surface (facing surface facing the chassis 14) 16 c opposite to the light emitting surface 16 a so as to cover almost the entire area. ing.

  The reflection sheet 20 is disposed so as to be sandwiched between the chassis 14 and the light guide plate 16, and can reflect the light emitted from the opposite surface 16 c of the light guide plate 16 to the outside on the back side and rise to the front side. It has become. The reflection sheet 20 is made of a synthetic resin and has a white surface with excellent light reflectivity. The reflection sheet 20 has a short side dimension larger than the short side dimension of the light guide plate 16, and both ends thereof are arranged to protrude closer to the LED 17 than the light incident surface 16 b of the light guide plate 16. Light that travels obliquely from the LED 17 toward the chassis 14 can be efficiently reflected by the projecting portion of the reflection sheet 20 and directed toward the light incident surface 16 b of the light guide plate 16.

  Next, the configurations of the LED 17, the LED substrate 18, and the heat radiating member 19 constituting the LED unit LU will be sequentially described. The LED 17 constituting the LED unit LU has a configuration in which an LED chip (not shown) is sealed with a resin material on a substrate portion fixed to the LED substrate 18. The LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used. On the other hand, the resin material that seals the LED chip is dispersed and blended with a phosphor that emits a predetermined color when excited by the blue light emitted from the LED chip, and generally emits white light as a whole. It is said. In addition, as the phosphor, for example, a yellow phosphor that emits yellow light, a green phosphor that emits green light, and a red phosphor that emits red light are used in appropriate combination, or any one of them is used. It can be used alone. The LED 17 is a so-called top surface light emitting type in which a surface opposite to the mounting surface with respect to the LED substrate 18 (a surface facing the light incident surface 16b of the light guide plate 16) is a main light emitting surface. The configuration of the heat dissipation member 19 will be described in detail later.

  Then, the structure of the flame | frame 13 and the chassis 14 which make an external appearance member and the holding member HM is demonstrated. Both the frame 13 and the chassis 14 are made of metal such as aluminum, for example, and mechanical strength (rigidity) and thermal conductivity are both higher than when the frame 13 and the chassis 14 are made of synthetic resin. As shown in FIG. 3, the frame 13 and the chassis 14 are stacked on each other while accommodating the LED units LU paired at both ends (both ends on both long sides) in the short side direction. The liquid crystal panel 11, the optical member 15, and the light guide plate 16 are accommodated so as to be sandwiched from the front side and the back side.

  As shown in FIG. 3, the frame 13 has a horizontally long frame shape as a whole so as to surround a display area on the display surface 11 c of the liquid crystal panel 11. The frame 13 includes a panel pressing portion 13a that is parallel to the display surface 11c of the liquid crystal panel 11 and presses the liquid crystal panel 11 from the front side, and a side wall portion 13b that protrudes from the outer peripheral side portion of the panel pressing portion 13a toward the back side. The cross-sectional shape is substantially L-shaped. Among these, the panel pressing portion 13a forms a horizontally long frame shape following the outer peripheral side portion (non-display area, frame portion) of the liquid crystal panel 11, and presses the outer peripheral side portion of the liquid crystal panel 11 from the front side over almost the entire circumference. Is possible. In addition to the outer peripheral side portion of the liquid crystal panel 11, the panel pressing portion 13a includes the optical member 15 and the outer peripheral side portion of the light guide plate 16 disposed on the outer side in the radial direction than the outer peripheral side portion of the liquid crystal panel 11, and each LED unit. The LU also has a width that can be covered from the front side. The outer surface of the panel pressing portion 13a facing the front side (the surface opposite to the surface facing the liquid crystal panel 11) is exposed to the outside on the front side of the liquid crystal display device 10 like the display surface 11c of the liquid crystal panel 11. The front surface of the liquid crystal display device 10 is configured together with the display surface 11 c of the panel 11. On the other hand, the side wall part 13b has comprised the substantially square cylinder shape which protrudes toward the back side from the outer peripheral side part (specifically outer peripheral edge part) in the panel pressing part 13a. The side wall portion 13b surrounds the liquid crystal panel 11, the optical member 15, the light guide plate 16, and each LED unit LU accommodated in the entire circumference, and can also surround the back side chassis 14 over almost the entire circumference. . The side wall portion 13 b has an outer surface along the circumferential direction of the liquid crystal display device 10 exposed to the outside in the circumferential direction of the liquid crystal display device 10, and constitutes a top surface, a bottom surface, and both side surfaces of the liquid crystal display device 10.

  The frame-shaped frame 13 having the basic configuration described above is formed by assembling four divided frames 13S divided for each side (each long side portion and each short side portion). Specifically, the divided frame 13S includes a pair of long side divided frames 13SL constituting the long side portions of the frame 13 (panel pressing portion 13a and side wall portion 13b) and a pair of short sides constituting the short side portions. The side-side divided frame 13SS is used. Since the long side divided frame 13SL covers each LED unit LU in addition to the liquid crystal panel 11, the optical member 15, and the light guide plate 16 (see FIG. 4), the short side divided frame that does not cover the LED unit LU. Compared to 13SS (see FIG. 5), it is formed relatively wide.

  A screw attachment portion 21 to which the first screw member SM1 is attached is integrally formed at a position closer to the inner side (near the light guide plate 16) than the side wall portion 13b in the panel pressing portion 13a. The screw attachment portion 21 protrudes from the inner surface of the panel pressing portion 13a toward the back side along the Z-axis direction, and extends along each side (X-axis direction or Y-axis direction) of the panel pressing portion 13a. It has an almost block shape. As shown in FIGS. 4 and 5, the screw attachment portion 21 is formed with a groove portion 21 a that opens toward the back side and can fasten the first screw member SM <b> 1. A plurality of flexible boards 26 are intermittently arranged along the long side direction of the printed board 27, and the other end portions are connected to the printed board 27, respectively. The printed circuit board 27 has a connector portion (not shown) connected to one end side of the FPC (not shown), and an FPC insertion hole (not shown) formed in the chassis 14 at the other end side of the FPC. ) Through the outside of the chassis 14 and connected to the control board CTB.

  An abutment rib 23 that supports the light guide plate 16 from the front side (display surface 11c side) is integrally formed at a position closer to the inner side than the screw mounting portion 21 in the panel pressing portion 13a. The abutment ribs 23 protrude from the inner surface of the panel pressing portion 13a toward the back side (light guide plate 16 side) along the Z-axis direction (the protruding direction of the screw mounting portion 21), and each side of the panel pressing portion 13a. Is formed in an elongated, substantially block shape extending along the line. The abutting ribs 23 are provided on the respective sides of the panel pressing portion 13a and each has a length dimension over the entire length of each side. Therefore, the abutment rib 23 can be supported from the front side (display surface 11c side) with the light guide plate 16 sandwiched between the chassis 14 and has a light guide plate support function. The light guide plate 16 is pressed from the front side by the contact rib 23 whose end side portion forms a frame shape over the entire circumference.

  As shown in FIGS. 4 and 5, a pressing protrusion 24 that protrudes to the back side, that is, the liquid crystal panel 11 side, is integrally formed on the inner edge portion of the panel pressing portion 13 a. The pressing protrusion 24 has a cushioning material 24a attached to its protruding tip surface, and the liquid crystal panel 11 can be pressed from the front side via the cushioning material 24a. As shown in FIG. 9, the pressing protrusion 24 and the cushioning material 24 a are configured to extend along each side in each divided frame 13 </ b> S constituting the frame 13, similarly to the screw mounting portion 21 described above. Also, each side is divided and provided, and when each divided frame 13S is assembled, the whole frame has a frame shape arranged on the inner peripheral edge of the panel pressing portion 13a.

  As shown in FIG. 3, the chassis 14 has a generally horizontally shallow, generally shallow dish shape so as to cover the light guide plate 16, the LED unit LU, and the like over almost the entire region from the back side. The outer surface of the chassis 14 facing the back side (the surface opposite to the surface facing the light guide plate 16 and the LED unit LU) is exposed outside the back side of the liquid crystal display device 10 and constitutes the back surface of the liquid crystal display device 10. doing. The chassis 14 has a horizontally long bottom plate portion 14a similar to the light guide plate 16, and a pair of LEDs that protrude from the ends of both long sides of the bottom plate portion 14a to the back side and accommodate the LED unit LU. And an accommodating portion 14b.

  Next, the configuration of the heat radiating member 19, the configuration of the light guide plate extending portion 16 s, and the configuration of the heat radiating member extending portion 19 s, which are main parts of the present embodiment, will be described. First, the configuration of the heat dissipation member 19 will be described. The heat dissipating member 19 constituting the LED unit LU is made of metal having excellent thermal conductivity such as aluminum, for example, and as shown in FIG. 6, the side surface portion 19 a to which the LED substrate 18 is attached and the plate surface of the chassis 14. And a bottom surface portion 19b that is in surface contact with each other, and these have a bent shape that is substantially L-shaped in cross-section. The length of the heat dissipation member 19 is approximately the same as the length of the LED substrate 18 described above. The side surface portion 19a constituting the heat radiating member 19 rises perpendicularly from the bottom surface portion 19b to the bottom surface portion 19b, and forms a plate shape parallel to the plate surface of the LED substrate 18 and the light incident surface 16b of the light guide plate 16. In addition, the long side direction coincides with the X-axis direction, the short side direction coincides with the Z-axis direction, and the thickness direction coincides with the Y-axis direction. The LED board 18 is attached to the inner plate surface of the side surface portion 19a, that is, the plate surface facing the light guide plate 16 side. The side part 19 a has a long side dimension substantially equal to the long side dimension of the LED substrate 18, but the short side dimension is larger than the short side dimension of the LED substrate 18. In addition, both end portions in the short side direction of the side surface portion 19a protrude outward from the both end portions of the LED substrate 18 along the Z-axis direction. The outer plate surface of the side surface portion 19 a, that is, the plate surface opposite to the plate surface to which the LED substrate 18 is attached, is opposed to the screw attachment portion 21 included in the frame 13. That is, the side surface portion 19 a is arranged in a form that is interposed between the screw mounting portion 21 of the frame 13 and the light guide plate 16. The side surface portion 19a is configured to rise from the outer end portion of the bottom surface portion 19b described below toward the front side, that is, the frame 13 side along the Z-axis direction.

  As shown in FIG. 6, the bottom surface portion 19 b constituting the heat radiating member 19 has a plate shape parallel to the plate surface of the chassis 14. The long side direction is the X-axis direction and the short side direction is the Y-axis direction. And the thickness direction coincides with the Z-axis direction. The bottom surface portion 19b extends from the back side end portion (the end portion on the chassis 14 side) of the side surface portion 19a so as to protrude inward along the Y-axis direction, that is, toward the center side of the light guide plate 16. Most of them are located on the back side of the light guide plate 16 and on the back side of the reflection sheet 20. That is, most of the bottom surface portion 19 b is arranged in a shape that is sandwiched (intervened) between the reflection sheet 20 and the chassis 14. The bottom surface portion 19b has a long side dimension substantially the same as the side surface portion 19a. Of the bottom surface portion 19b, the back plate surface, that is, the plate surface facing the chassis 14 side, is in surface contact with the plate surface of the chassis 14 (specifically, the plate surface of the LED housing portion 14b). Further, the bottom surface portion 19 b is screwed to the plate surface of the chassis 14 by the second screw member SM <b> 2, whereby the heat radiating member 19 is fixed on the plate surface of the chassis 14. In addition, the heat radiation member extending part 19s extended outside from the said end surface is provided in the both end surfaces by the side of the short side of the bottom face part 19b.

  Next, how to transmit heat generated on the LED substrate 18 in the liquid crystal display device 10 will be described. In the liquid crystal display device 10, since the heat dissipation member 19 is attached to the chassis 14 and separated from the frame 13, the heat generated on the LED substrate 18 when the LED 17 is turned on in the liquid crystal display device 10 is The heat is transferred from the LED board 18 to the heat radiating member 19, and is transferred to the chassis 14 through the bottom surface portion 19 b of the heat radiating member 19. Here, since the bottom surface portion 19b of the heat radiating member 19 extends toward the center side of the light guide plate 16, that is, on the side away from the contact portion (side wall portion 13b and screw mounting portion 21) with the frame 13 in the chassis 14. Therefore, most of the heat transmitted to the chassis 14 through the bottom surface portion 19b of the heat radiating member 19 is radiated from the plate surface of the LED housing portion 14b in the chassis 14 to the outside of the liquid crystal display device 10. The frame 13 is difficult to be transmitted. For this reason, the liquid crystal display device 10 has a configuration in which the temperature of the frame 13 serving as the accessible portion is prevented from becoming excessively high due to the heat generated on the LED substrate 18.

  Then, the structure of the light-guide plate extension part 16s and the heat radiating member extension part 19s is demonstrated. The light guide plate extending portion 16s extends from both ends in the end side direction (Y-axis direction) of both end surfaces on the short side of the light guide plate 16 so as to protrude in a block shape toward the outside of the light guide plate 16 ( (See FIGS. 3 and 7). A cylindrical pin 16t (an example of a protruding portion) protrudes toward the chassis 14 at a position slightly outside the center of the back surface (surface facing the chassis 14) of the light guide plate extension 16s. Has been. In addition, the reflective sheet 20 is not extended on the back surface of the light guide plate extending portion 16s, and the reflective sheet 20 is not laid. For this reason, a gap corresponding to the thickness of the reflection sheet 20 is provided between the light guide plate extension 16s and the heat radiation member extension 16s described below.

  The heat radiating member extending portion 19s extends in a plate shape so as to overlap with the light guide plate extending portion 16s from the end portion on the short side of the bottom surface portion 19b on the side close to the side surface portion 19a (FIG. 3). And FIG. 7). The heat dissipating member extending portion 19s is provided with a notch 19t (an example of a positioning hole) cut out in a rectangular shape from the outside (the front end side of the heat dissipating member extending portion 19s). The notch 19t is provided at such a position and size that the pin 16t provided in the light guide plate extending portion 16s is fitted with a small gap between the notch 19t. In a state where the pin 16t provided on the light guide plate extending portion 16s is fitted in the notch 19t provided on the heat radiating member extending portion 19s, the relative position between the light guide plate 16 and the heat radiating member 19 is positioned. The heat radiating member 19 is regulated in the thickness direction (Y-axis direction) of the LED substrate 18 with respect to the light guide plate 16 (see FIG. 7).

  Then, the assembly | attachment procedure in the manufacturing process of the liquid crystal display device 10 is demonstrated. In the manufacturing process of the liquid crystal display device 10 configured as described above, the members are sequentially assembled from the front side (liquid crystal panel 11 side) to the back side (chassis 14 side) of the liquid crystal display device 10. That is, after the liquid crystal panel 16 and the optical member 15 are assembled to the frame 13, the light guide plate 16 and the reflection sheet 20 are assembled, then the LED unit LU is assembled, and finally the chassis 14 is assembled. Become. In the manufacturing process having such a procedure, when the LED unit LU is assembled, the bottom surface portion 19b of the heat radiating member 19 extends toward the center side of the light guide plate 16. Is difficult to attach to the frame 14. In that respect, in the liquid crystal display device 10 according to the present embodiment, the notch 19t provided in the heat radiating member extending portion 19s can be fitted with the pin 16s provided in the light guide plate extending portion 16s, and thus manufacturing is performed. In the process, the heat radiating member 19 is positioned with respect to the light guide plate 16 by assembling the heat radiating member extending portion 19 s of the bottom surface portion 19 b extending toward the center of the light guide plate 16 to the light guide plate extending portion 16 s of the light guide plate 16. Can be made. Therefore, when the LED unit LU is assembled, the heat radiating member 19 can be temporarily fixed to the light guide plate 16 in advance. In this state, the chassis 14 is assembled, and the bottom surface portion 19b of the heat radiation member 19 is screwed from the back surface side of the chassis 14 with the second screw member SM2, whereby the heat radiation member 19 can be attached to the chassis 14. Thus, even if the bottom surface portion 19b of the heat radiating member 19 extends toward the center side of the light guide plate 16, the heat radiating member 19 can be positioned and temporarily fixed in the manufacturing process. It can be assembled.

  Further, in the liquid crystal display device 10, the heat dissipating member 19 is positioned in the manufacturing process as described above, whereby the heat dissipating member 19 is regulated in the thickness direction (Y-axis direction) of the LED substrate 18 with respect to the light guide plate 16 As a result, the distance between the light incident surface 16b of the light guide plate 16 and the LED 17 is restricted. And in this state, the bottom surface portion 19b of the heat radiating member 19 is fixed, and the position of the LED 17 is also fixed accordingly, so that the distance between the light incident surface 16b of the light guide plate 16 and the LED 17 is suppressed, In the liquid crystal display control device 10, a good optical design can be realized.

  As described above, in the liquid crystal display device 10 according to the present embodiment, since the heat dissipation member 19 is attached to the chassis 14 and is separated from the frame 13, most of the heat generated on the LED substrate 18 is dissipated. Since the heat is transmitted to the chassis 14 through the chassis and radiated from the chassis 14 to the outside, the temperature rise of the frame 13 can be suppressed. In the manufacturing process, when the light guide plate 16 is assembled in order from the frame 13 side, a notch 19 t provided in a part of the heat radiating member 19 is provided on a pin 16 t provided in a part of the light guide plate 16. Since the heat dissipating member 19 can be assembled in the fitted state, it is possible to prevent the distance between the end surface of the light guide plate 16 and the LED 17 disposed on the heat dissipating member 19 via the LED substrate 18 from being shifted in the assembling process. can do. As described above, in the liquid crystal display device 10 of a type that does not include a cabinet, it is possible to realize a configuration that can be easily assembled in the manufacturing process while preventing the temperature of the frame 13 serving as the accessible portion from becoming excessively high.

  Further, in the liquid crystal display device 10 according to the present embodiment, the light guide plate 16 has a light guide plate extending portion 16s extending outward from its end face, and a pin 16t is provided on the light guide plate extending portion 16s. It has been. And the heat radiating member 19 has the heat radiating member extension part 19s extended to the outer side from the edge part, The notch 19t is provided in the heat radiating member extension part 19s. Thereby, the light guide plate extending portion 16s of the light guide plate 16 and the heat radiating member extending portion 19s of the heat radiating member 19 are fitted and the heat radiating member 19 is positioned. For this reason, when positioning the heat radiating member 19 in the manufacturing process, it is easy to confirm the positioning portion, the light guide plate extending portion 16s and the heat radiating member extending portion 19s can be easily overlapped, and positioning is performed easily. be able to.

  Further, in the liquid crystal display device 10 according to the present embodiment, the notch 19t is provided so as to penetrate the plate surface of the heat radiating member extending portion 19s. For this reason, in the manufacturing process, the notch 19t can be visually recognized from the chassis 14 side (the side opposite to the side facing the pin 16t), and positioning can be performed easily.

  In the liquid crystal display device 10 according to the present embodiment, the notch 19t has a shape that regulates the pin 16t in the thickness direction (Y-axis direction) of the LED substrate 18 by fitting the pin 16t. . As a result, the pin 16t is fitted into the notch 19t, so that the distance between the LED substrate 18 and the light guide plate 16, that is, the distance between the LED 17 and the end face of the light guide plate 16 is regulated. Therefore, the distance between the two can be kept constant, and the optical design of the liquid crystal display device 10 can be improved.

  In the liquid crystal display device 10 according to the present embodiment, the heat dissipation member 19 is attached to the chassis 14 by being screwed to the chassis 14. For this reason, the positioned heat radiating member 19 can be screwed and fixed to the chassis 14 after the chassis 14 is assembled, and the heat radiating member 19 can be stabilized on the chassis 14.

  In the liquid crystal display device 10 according to the present embodiment, the heat generated on the LED substrate 18 can be effectively radiated to the outside of the device without adding a sheet-like heat radiating plate or the like separately. Since a part of the light guide plate 16 and a part of the heat radiating member 19 are fitted to each other, the heat radiating member 19 can be positioned in the manufacturing process. There will be no problems such as increase.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. The second embodiment is different from the first embodiment in that a screw hole 116t1 is provided in the pin 116t. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 8, the part obtained by adding the numeral 100 to the reference numeral in FIG. 7 is the same as the part described in the first embodiment.

  In the liquid crystal display device according to the second embodiment, as shown in FIG. 8, a screw hole 116t1 is provided along the axial direction (Z-axis direction) of the pin 116t provided in the light guide plate extending portion 116s. . For this reason, in the manufacturing process of the liquid crystal display device, after the pin is fitted into the notch 119t, the heat dissipating member extending portion 119s using the third screw member SM3 whose top is larger than the notch 119t. By screwing the pin 116t so as to sandwich the pin (see FIG. 9), the heat dissipation member 119 can be more securely fixed to the light guide plate 116 in the manufacturing process. Therefore, it is possible to prevent the heat dissipation member 119 temporarily fixed to the light guide plate 116 from being detached from the light guide plate 116.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. In the third embodiment, the shape of the positioning hole (the notch 16t in the first embodiment) of the light guide plate extending portion is different from that in the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 10, the part obtained by adding the numeral 200 to the reference sign in FIG. 7 is the same as the part described in the first embodiment.

  In the liquid crystal display device according to the third embodiment, as shown in FIG. 10, the light guide plate extending portion 216 s is not provided with a notch, but is provided with a hole-like positioning hole 219 t having a rectangular opening. With such a configuration, when the pin 216t is fitted into the positioning hole 219t, the periphery of the pin 216t is regulated by the positioning hole 219t over the entire circumference. For this reason, in the manufacturing process of a liquid crystal display device, it can suppress effectively that the position of the thermal radiation member 219 temporarily fixed with respect to the light-guide plate 216 shifts | deviates.

The modifications of the above embodiments are listed below.
(1) In each of the above embodiments, the configuration in which the pin is provided in the light guide plate extending portion is exemplified. However, the light guide plate extending portion may be provided with a protruding portion. It is not limited to.

(2) In each of the above-described embodiments, the configuration in which the notch or the positioning hole having a rectangular opening is provided in the extending portion of the heat dissipating member is illustrated, but the shape of the positioning hole provided in the heat dissipating member is not limited.

(3) In each of the above embodiments, the heat radiating member extending portion and the light guide plate extending portion are illustrated as extending from the end portions of the heat radiating member and the light guide plate, respectively. The arrangement and shape of are not limited.

(4) In each of the above embodiments, the configuration in which the bottom surface portion of the heat dissipation member is screwed to the chassis is illustrated, but the manner of attaching the heat dissipation member to the chassis is not limited.

(5) In addition to the above embodiments, the fitting mode between the protrusion provided in the light guide plate extension and the positioning hole provided in the heat dissipation member extension can be changed as appropriate.

(6) In addition to the above embodiments, the configuration and shape of the heat dissipation member can be changed as appropriate.

(7) In each of the above embodiments, a liquid crystal display device using a liquid crystal panel as the display panel has been illustrated, but the present invention can also be applied to display devices using other types of display panels.

  As mentioned above, although each embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

  TV ... TV receiver, LDU ... liquid crystal display unit, PWB ... power supply board, MB ... main board, CTB ... control board, CV ... cover member, ST ... stand, LU ... LED unit, 10 ... liquid crystal display device, 11 ... liquid crystal Panel, 12 ... Backlight device, 13 ... Frame, 14, 114, 214 ... Chassis, 14a, 114a, 214a ... Bottom plate part, 14b, 114b, 214b ... LED housing part, 15 ... Optical member, 16, 116, 216 ... Light guide plate, 16s, 116s, 216s ... Light guide plate extension, 16t, 116t, 216t ... Pin, 17, 117, 217 ... LED, 18, 118, 218 ... LED substrate, 19, 119, 219 ... Heat dissipation member, 19s 119 s, 219 s, heat radiating member extension, 19 t, 119 t, notch, 20, 120, 220. Cum sheet, 219t ... positioning holes

Claims (11)

A light source;
A display panel that performs display using light of the light source;
The display panel is arranged so as to overlap with the side opposite to the display surface side, the end surface is arranged to face the light source, and the light guides the light from the light source to the display panel side. A light plate,
A chassis disposed on the opposite side of the display panel with respect to the light guide plate;
A frame that is disposed on the display surface side of the display panel and that houses the display panel, the light source, and the light guide plate between the chassis and the chassis;
A heat dissipating member having heat dissipating property, mounted on the chassis, and disposed away from the frame;
A light source substrate having one plate surface attached to the heat dissipating member and the light source disposed on the other plate surface;
A projection provided on the light guide plate and projecting toward the chassis;
A positioning hole for positioning the heat dissipating member between the light guide plate and the chassis by being provided in the heat dissipating member and being fitted to the protrusion;
Equipped with a,
The light guide plate has a light guide plate extending portion extending outward from an end surface thereof, and the protrusion is provided on the light guide plate extending portion,
The heat radiation member, and having a heat radiating member extending portion extending outwardly from the end portion, a display device that has the positioning hole is provided in the heat radiation member extending portion.   The display device according to claim 1, wherein the positioning hole is provided so as to penetrate a plate surface of the heat radiating member.   The display device according to claim 1, wherein the positioning hole has a shape that restricts the protrusion in a thickness direction of the light source substrate by fitting the protrusion.   The display device according to claim 3, wherein the positioning hole has a hole shape.   The display device according to claim 1, wherein a screw hole is provided in the protrusion along the axial direction thereof.   The display device according to claim 1, wherein the heat dissipation member is attached to the chassis by being screwed to the chassis.   The display device according to claim 1, wherein the protrusion is a cylindrical pin.   The heat radiating member has a bottom surface portion whose plate surface is arranged along the plate surface of the chassis, and a side surface portion that rises perpendicularly from the bottom surface portion to the bottom surface portion, and is L-shaped in cross section. The display device according to claim 1, wherein the light source substrate is disposed on the side surface portion.   The display device according to claim 8, wherein the heat dissipating member has an L shape in which the bottom surface portion extends from one end of the side surface portion to the center side of the light guide plate in a cross-sectional view.   The display device according to claim 1, wherein the display panel is a liquid crystal panel using liquid crystal.   A television receiver comprising the display device according to any one of claims 1 to 10.

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