JP5747729B2 - LIGHTING DEVICE, LIQUID CRYSTAL DISPLAY DEVICE, AND ELECTRONIC DEVICE - Google Patents

Description

  The present invention relates to an illuminating device in which a light guide plate and an optical sheet are held in a frame body, a liquid crystal display device including the illuminating device, and an electronic apparatus including the liquid crystal display device.

  A liquid crystal display device including a transmissive liquid crystal panel includes a lighting device arranged to overlap the liquid crystal panel, and the lighting device includes a light guide plate, an optical sheet arranged to overlap the light guide plate, and the like. The light guide plate and the optical sheet are sandwiched between a pair of frames. Further, in holding the optical sheet, a configuration in which the optical sheet is elastically pressed and fixed to the light guide plate by an elastic member attached to a frame located on the optical sheet side has been proposed (Patent Documents 1, 2, 3, etc.). ).

JP-A-7-281184 Japanese Patent Laid-Open No. 10-39280 JP 2008-233492 A

  Here, when the liquid crystal display device is used as a liquid crystal television or the like, the liquid crystal display device is used upright. As a result, as in the configurations described in Patent Documents 1, 2, and 3, there is a problem in that the optical sheet is displaced by its own weight only by pressing and fixing the optical sheet to the light guide plate with an elastic member. When the deviation occurs, the optical sheet is bent, and uneven brightness or the like is generated in the image. However, when the periphery of the optical sheet is completely fixed, when the optical sheet expands due to a temperature rise or the like, the optical sheet bends, and brightness unevenness occurs in the image.

  In view of the above problems, the object of the present invention is to provide a configuration capable of preventing the optical sheet from being misaligned or bent even when the lighting device is used upright, a liquid crystal display device including the lighting device, And providing an electronic apparatus including the liquid crystal display device.

  In order to solve the above-described problems, the present invention provides a first frame, a light guide plate disposed so as to overlap with the first frame, and a structure overlapped with the light guide plate on the side opposite to the first frame. An optical sheet, and a second frame that is disposed on a side opposite to the light guide plate with respect to the optical sheet and covers an outer edge of the optical sheet, the lighting device comprising: an outer edge of the optical sheet; Of these, only the upper side is provided with an engaging portion in which a convex portion protruding from at least one of the first frame and the second frame fits into a hole formed in the optical sheet. .

  In the present invention, on the upper side of the outer edge of the optical sheet, an engaging portion is provided in which a convex portion protruding from one of the first frame and the second frame fits into a hole formed in the optical sheet. Therefore, even when the lighting device is used upright, it is possible to avoid the problem that the optical sheet is displaced due to its own weight. Further, since the engaging portion is provided only on the upper side, the lower end side of the optical sheet is displaced when the optical sheet expands due to a temperature rise or the like, so that the optical sheet is unlikely to be bent. Therefore, according to the present invention, even when the lighting device is used upright, it is possible to prevent the optical sheet from being displaced or bent.

  In the present invention, it is preferable that a first elastic holding portion that a first elastic member provided on the second frame presses the optical sheet against the light guide plate elastically is further provided on the upper side. According to this configuration, it is possible to prevent the upper side from floating from the light guide plate.

  In this invention, it is preferable that the 2nd elastic holding part which the 2nd elastic member provided in the said 2nd frame presses the said optical sheet against the said light-guide plate elastically is provided in the lower side of the said optical sheet. According to such a configuration, it is possible to prevent the lower side from floating from the light guide plate. Further, even if the second elastic holding portion is provided on the lower side of the optical sheet, when the optical sheet expands due to a temperature rise or the like, the expansion can be absorbed by the displacement of the lower end side of the optical sheet. It is difficult for bending to occur.

  In the present invention, it is preferable that the second elastic holding portion has a weaker pressing force than the first elastic holding portion. According to such a configuration, when the optical sheet expands due to a temperature rise or the like, the lower end side of the optical sheet can be reliably displaced, so that the expansion can be reliably absorbed.

  In the present invention, it is preferable that the first elastic member extends along the upper side. According to such a configuration, floating from the light guide plate can be prevented over the entire upper side.

  In the present invention, it is preferable that the first elastic member is divided into a plurality of parts in the extending direction of the upper side. According to this configuration, when the optical sheet expands in the left-right direction due to a temperature rise or the like, the optical sheet can be displaced in the left-right direction, so that expansion in the left-right direction can be absorbed.

  In this invention, it is preferable that the said engaging part is provided on the extension line | wire of the extension direction of a said 1st elastic member. According to such a configuration, there is an advantage that a region occupied by the engaging portion and the first elastic holding portion in the vertical direction may be narrow.

  In this invention, it is preferable that the said convex part is provided in the said 2nd frame. If a convex part is provided in the 2nd frame near the optical sheet, the engaging part can be constituted by a convex part having a small height.

  The illumination device according to the present invention is used in, for example, a liquid crystal display device. In this case, a liquid crystal panel is provided on the side opposite to the light guide plate with respect to the optical sheet.

  The liquid crystal display device according to the present invention is used in an electronic apparatus such as a liquid crystal television.

It is explanatory drawing of the liquid crystal television (electronic device) provided with the liquid crystal display device which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the whole structure of the liquid crystal display device which concerns on Embodiment 1 of this invention. It is a disassembled perspective view when the liquid crystal display device which concerns on Embodiment 1 of this invention is decomposed | disassembled further finely. It is sectional drawing of the liquid crystal display device which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the fixation structure to the frame body of the optical sheet in the illuminating device of the liquid crystal display device which concerns on Embodiment 1 of this invention. It is explanatory drawing which shows the fixation structure to the frame body of the optical sheet in the illuminating device of the liquid crystal display device which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows the fixation structure to the frame body of the optical sheet in the illuminating device of the liquid crystal display device which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the fixation structure to the frame body of the optical sheet in the illuminating device of the liquid crystal display device which concerns on Embodiment 4 of this invention. It is explanatory drawing which shows the fixation structure to the frame body of the optical sheet in the illuminating device of the liquid crystal display device which concerns on Embodiment 5 of this invention.

  An embodiment in which the present invention is applied to a liquid crystal display device for a liquid crystal television will be described with reference to the drawings. In the drawings to be referred to in the following description, the scales are different for each layer and each member so that each layer and each member have a size that can be recognized on the drawing. In the following description, one of the directions intersecting each other in the in-plane direction of the light guide plate or the liquid crystal panel (the left-right direction in which the long side of the light guide plate or the liquid crystal panel (display panel) shown in the drawing extends) is the X-axis direction. And the other (the vertical direction in which the short side of the light guide plate or liquid crystal panel shown in the figure extends) is the Y axis direction, and the direction intersecting the X axis direction and the Y axis direction (the light guide plate and the liquid crystal panel shown in the figure are The direction in which the layers are stacked is defined as the Z-axis direction. In the drawings referred to below, one side in the X-axis direction (left side toward the left) is the X1 side, the other side (right side toward the right) is the X2 side, and one side in the Y-axis direction (the lower side / the liquid crystal panel) The direction in which the overhanging portion is arranged is the Y1 side, the other side (upper side) opposite to this is the Y2 side, and one side in the Z-axis direction (the direction facing the back surface of the light guide plate) is the Z1 side (lower) The other side (the side from which illumination light or display light is emitted) opposite to this is shown as the Z2 side (upper side).

[Embodiment 1]
(overall structure)
FIG. 1 is an explanatory diagram of a liquid crystal television (electronic device) provided with a liquid crystal display device according to Embodiment 1 of the present invention. FIGS. 1 (a) and 1 (b) schematically show the appearance of the liquid crystal television. It is explanatory drawing shown, and the block diagram which shows the electrical structure of a liquid crystal display device.

  An electronic device 2000 illustrated in FIG. 1A is a liquid crystal television, and includes a liquid crystal display device 100, a television frame 2010, and the like. The liquid crystal display device 100 includes a liquid crystal panel 10 (display panel) described later, an image signal supply unit 270 that supplies an image signal to the liquid crystal panel 10, and an illumination device 8 that supplies illumination light to the liquid crystal panel 10. Yes. The liquid crystal display device 100 includes a scanning line driving circuit 104 that drives scanning lines extending in the X-axis direction in the liquid crystal panel 10 and a data line driving that drives data lines extending in the Y-axis direction in the liquid crystal panel 10. Circuit 101. As the scanning line driving circuit 104 and the data line driving circuit 101, a configuration in which both are built in the liquid crystal panel 10 can be adopted. Further, it is possible to adopt a configuration in which one of the scanning line driving circuit 104 and the data line driving circuit 101 is built in the liquid crystal panel 10 and the other is built in a driving IC mounted on the liquid crystal panel 10 by COG. One of the scanning line driving circuit 104 and the data line driving circuit 101 is built in the liquid crystal panel 10, and the other is built in the driving IC mounted on the circuit board electrically connected to the liquid crystal panel 10. A configuration can be employed. Furthermore, a configuration in which both the scanning line driving circuit 104 and the data line driving circuit 101 are incorporated in a driving IC separate from the liquid crystal panel 10 can be employed.

  In this embodiment, the illuminating device 8 includes a light guide plate 80 disposed on the liquid crystal panel 10 and a plurality of light emitting elements disposed along a side end surface of the light guide plate 80 as a light incident portion 80a. It has an element 89, a light source substrate 88 on which a plurality of light emitting elements 89 are mounted, and a light source driving unit 280 that drives the light emitting elements 89. In the present embodiment, the liquid crystal panel 10 is a horizontally long rectangle, and has four sides (a lower side 10a, an upper side 10b, a left side 10c, and a right side 10d) on the outer edge. The lower side 10a is a long side located on one side Y1 in the Y-axis direction, the upper side 10b is a long side located on the other side Y2 in the Y-axis direction, and the left side 10c is a short side located on one side X1 in the X-axis direction. The right side 10d is a short side located on the other side X2 in the X-axis direction. Corresponding to this shape, the light guide plate 80 has four side end surfaces 801, 802, 803, and 804. Among these side end faces 801, 802, 803, 804, the side end face 801 is located on the long side of one side Y1 in the Y-axis direction, and the side end face 802 is located on the long side of the other side Y2 in the Y-axis direction, The side end face 803 is located on the short side of the one side X1 in the X-axis direction, and the side end face 804 is located on the short side of the other side X2 in the X-axis direction. In this embodiment, of the four side end surfaces 801, 802, 803, 804 of the light guide plate 80, the two side end surfaces 801, 802 facing each other in the short side direction (Y-axis direction) serve as the light incident portion 80a. For this reason, the light emitting element 89 is arranged along each of the two side end faces 801 and 802 (light incident portion 80a) of the light guide plate 80, and the light source substrate 88 is arranged on the two side end faces 801 and 802 of the light guide plate 80. It extends along each (light incident part 80a).

(Specific configuration of the liquid crystal display device 100)
FIG. 2 is an explanatory diagram showing the overall configuration of the liquid crystal display device 100 according to Embodiment 1 of the present invention. FIGS. 2A and 2B are a perspective view and an exploded perspective view of the liquid crystal display device 100. FIG. is there. FIG. 3 is an exploded perspective view when the liquid crystal display device 100 according to Embodiment 1 of the present invention is further finely disassembled. 4 is a cross-sectional view of the liquid crystal display device 100 according to Embodiment 1 of the present invention, and FIGS. 4A and 4B are cross-sectional views taken along the line AA ′ on the lower side 10a side of the liquid crystal display device 100. FIG. 4 is a cross-sectional view taken along the line BB ′ on the upper side 10b side of the liquid crystal panel 10. FIG.

  2, 3, and 4, a liquid crystal display device 100 according to the present embodiment includes an illuminating device 8 that is generally referred to as a so-called backlight device, and a transmissive liquid crystal panel that is disposed on the upper surface of the illuminating device 8. 10. The liquid crystal display device 100 has a frame body 9. In this embodiment, the frame body 9 includes a metal first frame 40 disposed so as to cover the back surface of the light guide plate 80 on the back surface side (one side Z1 in the Z-axis direction), and liquid crystal on the front side of the first frame 40. A resin-made second frame 30 (resin frame) that holds the end portion of the panel 10 and surrounds and holds the lighting device 8, and a metal disposed on the front side (the other side Z2 in the Z-axis direction) of the second frame 30 And a third frame 50 made of metal.

  The second frame 30 has a rectangular frame shape that holds the end of the liquid crystal panel 10 and surrounds the liquid crystal panel 10. In this embodiment, the second frame 30 is formed on four sides of the liquid crystal panel 10. Correspondingly, it consists of four frame plates 31, 32, 33, 34 divided into four sides. In the present embodiment, the second frame 30 is black, and functions as a light absorbing member, thereby preventing stray light from being generated in the lighting device 8. The frame plates 31, 32, 33, and 34 are respectively side plate portions 311, 321, 331, and 341 that extend to the back side on the outer surface side of the frame plates 31, 32, 33, and 34, and the side plate portions 311, 321, 331, The front plate portion 315, 325, 335, 345 (end plate portion) bent inward from the upper end edge of 341, and the front plate portion 315, 325, 335, 345 protruded inward from the middle position in the height direction. And projecting plate portions 312, 322, 332, and 342.

  For this reason, step portions 313, 323, 333, 343 projecting from the protruding plate portions 312, 322, 332, 342 toward the liquid crystal panel 10 are formed inside the frame plates 31, 32, 33, 34, The position in the in-plane direction of the liquid crystal panel 10 is defined by the step portions 313, 323, 333, and 343 and the protruding plate portions 312, 322, 332, and 342. Further, the light guide plate 80, the light emitting element 89, and the like of the lighting device 8 are disposed on the back side of the protruding plate portions 312, 322, 332, and 342.

  The first frame 40 is formed by pressing a thin metal plate such as a SUS plate. The first frame 40 includes a bottom plate portion 45 and three side plate portions 42, 43, and 44 that stand up from three sides of the outer peripheral edge of the bottom plate portion 45 except for one side Y1 in the Y-axis direction. It has a rectangular box shape with an open front. The side plate portions 321, 331, and 341 of the second frame 30 overlap the outside of the side plate portions 42, 43, and 44 of the first frame 40. Further, the side plate portion 311 of the second frame 30 covers one side Y1 of the first frame 40 in the Y-axis direction.

  Similarly to the first frame 40, the third frame 50 is formed by pressing a thin metal plate such as a SUS plate. The third frame 50 includes a rectangular front plate portion 55 (end plate portion) and four side plate portions 51, 52, 53, 54 bent downward from the outer peripheral edge of the front plate portion 55. It is a rectangular box that opens. The side plate portions 51, 52, 53 and 54 overlap the outside of the side plate portions 311, 321, 331 and 341 of the second frame 30. A rectangular window 550 that emits light emitted from the liquid crystal panel 10 is formed in the front plate portion 55, and the front plate portion 55 covers the entire outer peripheral end portion of the display light emission side of the liquid crystal panel 10. It covers all around.

(Configuration of the liquid crystal panel 10)
As shown in FIGS. 2, 3, and 4, the liquid crystal panel 10 has a quadrangular planar shape, and an element substrate 11 on which pixel electrodes (not shown) and the like are formed, and the element substrate 11. The counter substrate 12 is disposed so as to be opposed to each other with a predetermined gap, and the rectangular frame-shaped sealing material 14 for bonding the counter substrate 12 and the element substrate 11 together is provided. In the liquid crystal panel 10, the liquid crystal layer 13 is held in a region surrounded by the sealing material 14 between the element substrate 11 and the counter substrate 12. The element substrate 11 and the counter substrate 12 are made of a light-transmitting substrate such as a glass substrate. In the element substrate 11, a plurality of scanning lines (not shown) extend in the X-axis direction, while a plurality of data lines extend in the Y-axis direction. A switching element (not shown) and a pixel electrode are provided corresponding to the intersection with the pixel electrode.

  In this embodiment, the counter substrate 12 is disposed on the display light emission side, and the element substrate 11 is disposed on the illumination device 8 side. In addition, a frame layer (not shown) made of a rectangular frame-shaped light shielding layer is formed along the inner edges of the four sides of the sealing material 14 on the surface of the counter substrate 12 facing the element substrate 11. The area defined by the inner edge of the frame layer is the image display area 100a. The inner edge of the front plate portion 55 of the third frame 50 is in the middle of the frame layer in the width direction, and the window 550 of the third frame 50 overlaps the image display area 100a.

  The liquid crystal panel 10 is configured as a liquid crystal panel of a TN (Twisted Nematic) method, an ECB (Electrically Controlled Birefringence) method, or a VAN (Vertical Aligned Nematic) method. A pixel electrode is formed on the element substrate 11, and the counter substrate 12. A common electrode (not shown) is formed. When the liquid crystal panel 10 is an IPS (In Plane Switching) type or FFS (Fringe Field Switching) type liquid crystal panel, the common electrode is provided on the element substrate 11 side. Further, the element substrate 11 may be disposed on the display light emission side with respect to the counter substrate 12. An upper polarizing plate 18 is disposed on the upper surface of the liquid crystal panel 10, and a lower polarizing plate 17 is disposed between the lower surface of the liquid crystal panel 10 and the lighting device 8.

  In this embodiment, the element substrate 11 is larger than the counter substrate 12. For this reason, the element substrate 11 has a projecting portion 110 projecting from the end portion of the counter substrate 12 on one side Y1 in the Y-axis direction, and a plurality of flexible wiring substrates 200 are provided on the projecting portion 110. It is connected. The flexible wiring board 200 is connected to a circuit board 250 made of a rigid board, and the circuit board 250 has a control IC (not shown) constituting the image signal supply unit 270 described with reference to FIG. In addition, a light source driving IC (not shown) constituting the light source driving unit 280 is mounted.

  As shown in FIGS. 3 and 4, the illuminating device 8 includes a light guide plate 80 arranged on the lower surface side of the liquid crystal panel 10, and a light incident portion with the light emitting surface 89 a facing the light incident portion 80 a of the light guide plate 80. And a plurality of light emitting elements 89 arranged from one end side (one side X1 in the X-axis direction) of 80a toward the other end side (the other side X2 in the X-axis direction). In this embodiment, the plurality of light emitting elements 89 are mounted on one surface 881 of the light source substrate 88 extending in the X axis direction along the light incident portion 80a. The light emitting element 89 is an LED (Light Emitting Diode) that emits white light, and emits light source light as divergent light.

  In the lighting device 8 of this embodiment, of the side end surfaces 801, 802, 803, and 804 of the light guide plate 80, two side end surfaces 801 and 802 that face each other in the Y-axis direction are used as the light incident portion 80a. For this reason, the plurality of light emitting elements 89 have the light emitting surface 89a directed to the two light incident portions 80a (side end surfaces 801 and 802) of the light guide plate 80, and the two light incident portions 80a (side end surfaces 801 and 802) respectively. These are arranged from one end side toward the other end side. The light source substrate 88 extends along each of the light incident portions 80a (side end surfaces 801 and 802), and a plurality of light emitting elements are provided on one surface 881 of each of the two light source substrates 88. 89 is implemented.

  In this embodiment, the light guide plate 80 is a translucent resin plate made of acrylic resin, polymethylstyrene resin, polycarbonate resin, or the like, and the back surface 80c of the light guide plate 80 (surface opposite to the light exit surface 80b / opposite). Surface) and the bottom plate portion 45 of the first frame 40, a reflective sheet 187 is disposed so as to overlap. The resin plate used for the light guide plate 80 is formed by extrusion molding, injection molding, or the like.

  Further, an optical sheet 180 such as a diffusion sheet 182 and prism sheets 183 and 184 is disposed between the light emitting surface 80 b of the light guide plate 80 and the liquid crystal panel 10. The diffusion sheet 182 is a sheet provided with a coating layer in which silica particles or the like are dispersed in a translucent resin such as an acrylic resin or a polycarbonate resin. In this embodiment, the two prism sheets 183 and 184 are arranged so that their ridge lines are orthogonal to each other. Therefore, the illumination light emitted from the light emitting surface 80b of the light guide plate 80 has a peak in the front direction of the liquid crystal panel 10 by the two prism sheets 183 and 184 after being diffused in all directions by the diffusion sheet 182. Such directivity is given.

  In the light guide plate 80, a plurality of grooves (not shown) made of linear fine recesses extending in the X-axis direction are formed as diffusion patterns on the back surface 80c where the reflection sheet 187 is located. In this embodiment, the density of the groove increases as the distance from the light emitting element 89 increases. For this reason, the intensity distribution of the illumination light emitted from the light guide plate 80 is made uniform regardless of the distance from the light emitting element 89. A reflective sheet 187 is disposed between the bottom plate portion 45 of the first frame 40 and the back surface 80 c of the light guide plate 80.

  In this embodiment, the light source substrate 88 is disposed so that one surface 881 on which the light emitting element 89 is mounted faces the light incident portion 80 a of the light guide plate 80. The light source substrate 88 has a structure in which a wiring pattern and a land are provided together with an insulating layer on one surface 881 side of a plate-like metal plate 887 (support plate) extending along the light incident portion 80a. ing. Such a configuration can be realized by attaching a flexible wiring substrate 888 in which a resin base material layer, a wiring pattern, an insulating protective layer, and the like are laminated in this order on one surface 881 side of the metal plate 887. Accordingly, the land on which the wiring pattern and the chip of the light emitting element 89 are mounted is electrically insulated from the metal plate 887. In this embodiment, the metal plate 887 is made of an aluminum plate, and the metal plate 887 ensures the mechanical strength of the light source substrate 88 and also functions as a heat radiating plate for heat generated from the light emitting element 89.

  A light source support member 60 for holding the light source substrate 88 is disposed on the other surface 882 side of each of the two light source substrates 88. The light source support member 60 includes the first frame 40 and the second frame. 30 and is held between. In the present embodiment, the light source support member 60 is a rod-shaped metal component that extends along the other surface 882 of the light source substrate 88. The light source support member 60 includes a bottom plate portion 61 that overlaps the bottom plate portion 45 of the first frame 40, and a substrate support plate portion 62 that constitutes a wall surface protruding upward from an intermediate position in the width direction of the bottom plate portion 61. . The light source support member 60 includes a front plate portion 63 that is bent from the substrate support plate portion 62 to the side opposite to the side where the light guide plate 80 is located on the side opposite to the bottom plate portion 61 of the substrate support plate portion 62. The front plate portion 63 is fixed to at least one of the front plate portion 55 of the third frame 50 and the front plate portions 315 and 325 of the second frame 30 with screws or the like.

  In the light source support member 60 having such a configuration, the surface of the substrate support plate portion 62 on the side where the light guide plate 80 is located is a substrate holding surface 620 that holds the light source substrate 88. In this embodiment, the light source substrate 88 is fixed to the substrate holding surface 620 with screws or the like. In this state, the entire surface of the other surface 882 (metal plate 887) of the light source substrate 88 is in surface contact with the substrate holding surface 620 and overlaps with it in close contact. The light source support member 60 is made of a metal such as aluminum or an iron-based metal. Therefore, the heat generated in the light emitting element 89 is transmitted from the metal plate 887 of the light source substrate 88 to the light source support member 60, and the heat of the light source support member 60 is transmitted to the first frame 40. Therefore, the temperature rise of the light emitting element 89 can be suppressed low.

(Fixing structure of optical sheet 180 etc.)
FIG. 5 is an explanatory diagram showing a structure for fixing the optical sheet 180 to the frame body 9 in the illumination device 8 of the liquid crystal display device 100 according to Embodiment 1 of the present invention. In FIG. 5, the optical sheet 180 is indicated by a thick solid line, the second frame 30 of the frame body 9 is indicated by a thin solid line, the first frame 40 of the frame body 9 is indicated by an alternate long and short dash line, and the light guide plate 80 is indicated by a dotted line. It is. In FIG. 5, the third frame 50 of the frame body 9 is not shown.

  In the liquid crystal display device 100 described with reference to FIGS. 1 to 4, the third frame 50, the second frame 30, and the first frame 40 are coupled by screws (not shown) or the like, and the liquid crystal panel 10 is disposed inside. And holding the lighting device 8. More specifically, the end portion of the liquid crystal panel 10 is sandwiched between the protruding plate portions 312, 322, 332, 342 of the second frame 30 and the front plate portion 55 of the third frame 50. In addition, the reflection sheet 187, the light guide plate 80, and the optical sheet 180 (the diffusion sheet 182, the prism sheet 183, and the like) are provided between the protruding plate portions 312, 322, 332, 342 of the second frame 30 and the bottom plate portion 45 of the first frame 40. 184) is pinched. Therefore, the end portions of the optical sheet 180 (the end portion on the lower side 180a side, the end portion on the upper side 180b side, the end portion on the left side 180c side, and the end portion on the right side 180d side) shown in FIG. The parts 312, 322, 332, and 342 are sandwiched between the light guide plate 80.

  In the illumination device 8 and the liquid crystal display device 100 configured as described above, in this embodiment, as shown in FIGS. 4B and 5, the upper side 180 b side of the optical sheet 180 (diffusion sheet 182, prism sheet 183, 184). A plurality of holes 181 are formed along the upper side 180b. On the other hand, in the frame plate 32 of the second frame 30, the protruding plate portion 322 is formed with a plurality of convex portions 326 along the upper side 180b of the optical sheet 180, and each of the plurality of convex portions 326 has a plurality of holes. The engagement portion 96 is configured by being fitted to 181. In this embodiment, five holes 181 and five convex portions 326 are formed at equal intervals along the upper side 180b of the optical sheet 180. Therefore, the engaging portions 96 are equal along the upper side 180b of the optical sheet 180. It is formed in five places at intervals. In this embodiment, the convex portion 326 is provided at a position overlapping the light source support member 60 and does not overlap the light guide plate 80. In the light source support member 60, a concave step portion 630 is formed at the end portion of the front plate portion 63 on the image display region 100 a side, and the tip end portion of the convex portion 326 enters the concave step portion 630.

  In addition, on the upper side 180 b side of the optical sheet 180, the first elastic member 91 made of a rubber sheet or the like provided on the protruding plate portion 322 is elastically pressed and fixed to the light guide plate 80 on the upper side 180 b side of the optical sheet 180. An elastic holding portion 97 is formed. The first elastic member 91 extends along the upper side 180b of the optical sheet 180 at a position overlapping the light guide plate 80, and the first elastic holding part 97 extends so as to extend along the upper side 180b of the optical sheet 180. It is configured. Therefore, the upper side 180b side of the optical sheet 180 is held by the frame body 9 along the upper side 180b by the engaging portion 96 and the first elastic holding portion 97.

  On the other hand, as shown in FIGS. 4A and 5, a rubber sheet or the like provided on the projecting plate portion 312 is provided on the lower side 180a side of the optical sheet 180 (diffusion sheet 182, prism sheet 183, 184). A second elastic holding portion 98 is formed by elastically pressing and fixing the lower side 180a side of the optical sheet 180 to the light guide plate 80 by the second elastic member 92, and no engaging portion is formed. The second elastic member 92 extends along the lower side 180 a of the optical sheet 180, and the second elastic holding portion 98 is configured to extend along the lower side 180 a of the optical sheet 180. Therefore, the lower side 180 a side of the optical sheet 180 is held by the frame body 9 along the lower side 180 a by the second elastic holding unit 98. In this embodiment, the second elastic member 92 is made of a rubber sheet having the same material, thickness, width, length, etc. as the first elastic member 91. The first elastic member 91 and the second elastic member 92 The member 92 exhibits the same pressing force.

  Note that neither the engaging portion nor the elastic holding portion is configured on the left side 180c or the right side 180d of the optical sheet 180.

(Main effects of this form)
As described above, in the illumination device 8 and the liquid crystal display device 100 of the present embodiment, from the second frame 30 of the first frame 40 and the second frame 30 to the upper side 180 b side of the outer edge of the optical sheet 180. An engaging portion 96 is provided in which the protruding convex portion 326 is fitted into a hole 181 formed in the optical sheet 180. For this reason, even when the lighting device 8 and the liquid crystal display device 100 are used upright, the problem that the optical sheet 180 is shifted downward due to the weight of the optical sheet 180 itself can be avoided. Further, since the engaging portion 96 is provided only on the upper side 180b side and no engaging portion is provided on the lower side 180a side, the lower side 180a side can be displaced. Accordingly, even when the optical sheet 180 expands due to a temperature rise or the like, such expansion can be absorbed by the displacement of the lower side 180a side of the optical sheet 180, so that the optical sheet 180 is unlikely to be bent. Therefore, according to this embodiment, even when the lighting device 8 and the liquid crystal display device 100 are used in an upright position, the optical sheet 180 can be prevented from being displaced or bent.

  Further, on the upper side 180 b side of the optical sheet 180, a first elastic holding portion 97 is further provided that the first elastic member 91 provided on the second frame 30 presses the optical sheet 180 against the light guide plate 80 with elasticity. Therefore, the upper side 180b side of the optical sheet 180 can be prevented from floating from the light guide plate 80.

  In this embodiment, a second elastic holding portion 98 is provided on the lower side 180a side of the optical sheet 180 so that the second elastic member 92 provided on the second frame 30 elastically presses the optical sheet 180 against the light guide plate 80. Yes. For this reason, it is possible to prevent the lower side 180 a side of the optical sheet 180 from floating from the light guide plate 80. Further, even if the second elastic holding portion 98 is provided on the lower side 180a side of the optical sheet 180, if the second elastic holding portion 98 is used, the lower side 180a of the optical sheet 180 is expanded when the optical sheet 180 expands due to a temperature rise or the like. Allow some side displacement. Accordingly, even when the optical sheet 180 expands due to a temperature rise or the like, such expansion can be absorbed by the displacement of the lower side 180a side of the optical sheet 180, so that the optical sheet 180 is unlikely to be bent.

  In addition, the convex portion that fits into the hole 181 of the optical sheet 180 may be provided in the first frame 40, but in this embodiment, the second frame 30 provided at a position closer to the optical sheet 180 than the first frame 40, A convex portion 326 that fits into the hole 181 of the optical sheet 180 is provided. For this reason, the engaging part 96 can be comprised by the convex part 326 with a small height dimension, and there exists an advantage that there is no possibility that the convex part 326 may interfere with the periphery.

[Embodiment 2]
FIG. 6 is an explanatory view showing a structure for fixing the optical sheet 180 to the frame body 9 in the illumination device 8 of the liquid crystal display device 100 according to Embodiment 2 of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the first embodiment, since the first elastic member 91 and the second elastic member 92 are made of rubber sheets having the same material, thickness, width, length, etc., the first elastic holding member The portion 97 and the second elastic holding portion 98 exhibit the same pressing force. On the other hand, in this embodiment, the second elastic holding portion 98 has a weaker pressing force than the first elastic holding portion 97. More specifically, as shown in FIG. 6, the first elastic member 91 and the second elastic member 92 are made of a rubber sheet having the same material, thickness, length, etc., but the second elastic member The width dimension W92 of 92 is smaller than the width dimension W91 of the first elastic member 91. For this reason, the lower side 180a side of the optical sheet 180 is easily displaced. Accordingly, even when the optical sheet 180 expands due to a temperature rise or the like, such expansion can be absorbed by the displacement of the lower side 180a side of the optical sheet 180, so that the optical sheet 180 is unlikely to be bent.

  In this embodiment, the pressing force of the second elastic holding part 98 is pressed against the first elastic holding part 97 by making the width dimension W92 of the second elastic member 92 smaller than the width dimension W91 of the first elastic member 91. Although it is smaller than the force, the first elastic member 91 and the second elastic member 92 are made of different materials, thicknesses, lengths, etc., and the pressing force of the second elastic holding portion 98 is changed to the first elastic holding portion 97. It may be smaller than the pressing force of.

[Embodiment 3]
FIG. 7 is an explanatory diagram showing a structure for fixing the optical sheet 180 to the frame body 9 in the illumination device 8 of the liquid crystal display device 100 according to Embodiment 3 of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  In Embodiment 1, the hole 181 is provided only on the upper side 180b of the optical sheet 180. However, in this embodiment, as shown in FIG. 7, both the upper side 180b and the lower side 180a of the optical sheet 180 are the same in the X-axis direction. Is provided with a hole 181. However, in the second frame 30, the convex portion 326 is formed only on the upper side protruding plate portion 322, and the protruding portion 326 is not formed on the lower side protruding plate portion 312. According to this configuration, after the optical sheet 180 is formed, the engaging portion 96 can be configured by using any of the opposing long sides as the upper side 180b. In the first embodiment, both the upper side 180b and the lower side 180a extend linearly. However, as in the present embodiment, a convex portion 180s is formed on the upper side 180b and the lower side 180a, and the convex portion 180s The hole 181 may be formed.

[Embodiment 4]
FIG. 8 is an explanatory diagram showing a structure for fixing the optical sheet 180 to the frame body 9 in the illumination device 8 of the liquid crystal display device 100 according to Embodiment 4 of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the first, second, and third embodiments, the first elastic member 91 and the second elastic member 92 are each formed of one rubber sheet. However, in the present embodiment, as shown in FIG. Is divided into a plurality in the extending direction of the upper side 180b. Further, in the present embodiment, the second elastic member 92 is also divided into a plurality of parts in the extending direction of the lower side 180a, like the first elastic member 91. In this embodiment, each of the first elastic member 91 and the second elastic member 92 is divided into three. According to this configuration, the pressing force of the first elastic member 91 and the second elastic member 92 can be reduced. Therefore, when the optical sheet 180 expands in the left-right direction due to a temperature rise or the like, the optical sheet 180 can be displaced in the left-right direction, so that the expansion in the left-right direction can be absorbed.

  In the present embodiment, the first elastic member 91 and the second elastic member 92 have the same material, thickness, width dimension, etc., but the space S92 of the portion divided in the second elastic member 92 is the first elastic member 91. The elastic member 91 is larger than the space S91 of the divided part. Therefore, in the first elastic member 91 and the second elastic member 92, the length dimension of the portion divided in the second elastic member 92 is shorter than the length dimension of the portion divided in the first elastic member 91. The 2 elastic holding part 98 has a weaker pressing force than the first elastic holding part 97. For this reason, the lower side 180a side of the optical sheet 180 is easily displaced. Accordingly, even when the optical sheet 180 expands due to a temperature rise or the like, such expansion can be absorbed by the displacement of the lower side 180a side of the optical sheet 180, so that the optical sheet 180 is unlikely to be bent.

[Embodiment 5]
FIG. 9 is an explanatory diagram showing a structure for fixing the optical sheet 180 to the frame body 9 in the illumination device 8 of the liquid crystal display device 100 according to Embodiment 5 of the present invention. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  In the first to fourth embodiments, an engaging portion 96 (hole 181 and convex portion 326) is provided on the outer edge side of the upper side 180b of the optical sheet 180, and the engaging portion 96 is provided on the opposite side to the outer edge side. One elastic holding portion 97 (first elastic member 91) was provided. On the other hand, in this embodiment, as shown in FIG. 9, on the upper side 180 b side of the optical sheet 180, the engaging portion 96 (the hole 181 and the convex portion 326) is on the extension line in the extending direction of the first elastic member 91. Is provided. More specifically, the first elastic member 91 extends in the X-axis direction in a region overlapping with the end portion of the light guide plate 80, and is engaged with a position sandwiching the first elastic member 91 on both sides in the X-axis direction. A portion 96 (hole 181 and convex portion 326) is provided, and the engaging portion 96 does not overlap the light guide plate 80 in plan view. According to such a configuration, there is an advantage that a region occupied by the engaging portion 96 and the first elastic holding portion 97 in the vertical direction may be narrow.

  In this embodiment, the first elastic member 91 and the second elastic member 92 have the same material, thickness, width, etc., but the length of the second elastic member 92 is the same as that of the first elastic member 91. Since it is shorter than the length dimension, the second elastic holding part 98 has a weaker pressing force than the first elastic holding part 97. For this reason, the lower side 180a side of the optical sheet 180 is easily displaced. Accordingly, even when the optical sheet 180 expands due to a temperature rise or the like, such expansion can be absorbed by the displacement of the lower side 180a side of the optical sheet 180, so that the optical sheet 180 is unlikely to be bent.

[Other embodiments]
In the above embodiment, on the upper side 180 b side of the optical sheet 180, the convex portion 326 of the second frame 30 fits into the hole 181 of the optical sheet 180, and the first elastic member provided in the second frame 30. 91 provided with the first elastic holding portion 97 that elastically presses the optical sheet 180 against the light guide plate 80, but only the engaging portion 96 may be provided. In the above embodiment, the second elastic holding portion 98 is provided on the lower side 180 a side of the optical sheet 180 so that the second elastic member 92 provided on the second frame 30 elastically presses the optical sheet 180 against the light guide plate 80. However, a configuration in which the second elastic holding portion 98 is not provided on the lower side 180a side of the optical sheet 180 may be employed.

  In the above embodiment, the engaging portion and the elastic holding portion are not provided on the left side 180c side and the right side 180d side of the optical sheet 180, but an elastic holding portion may be provided.

  In the above embodiment, the convex portion 326 that fits into the hole 181 of the optical sheet 180 is provided on the second frame 30, but the convex portion that fits into the hole 181 of the optical sheet 180 may be provided on the first frame 40. Good.

  In the above embodiment, both the side end face 801 side of the light guide plate 80 and the side end face 802 side of the light guide plate 80 are the light incident portions 80a, but only one of the side end faces 801 and 802 is light incident. The present invention may be applied to the liquid crystal display device 100 that is the portion 80a.

  In the first embodiment, the one surface 881 of the light source substrate 88 is opposed to the light incident portion 80a of the light guide plate 80. However, the one surface 881 of the light source substrate 88 is light incident on the light guide plate 80. The present invention may be applied to the liquid crystal display device 100 having a configuration orthogonal to the portion 80a.

  In the above embodiment, the illumination device 8 is used as the backlight device of the liquid crystal display device 100, but may be used as a backlight device for various signage.

[Example of mounting on electronic devices]
In the above-described embodiment, the liquid crystal television is exemplified as the electronic device 2000 on which the liquid crystal display device 100 is mounted. However, in addition to the liquid crystal television, electronic devices such as a display of a personal computer, a digital signage, a car navigation device, and a portable information terminal. The liquid crystal display device 100 to which the present invention is applied may be used for the display unit.

8 .... Lighting device, 10 .... Liquid crystal panel, 30 ... Second frame, 40 ... First frame, 50 ... Third frame, 80 ... Light guide plate, 80a ... Light incident part, 89 ... Light emission Element (light source) 91... First elastic member 92.. Second elastic member 96.. Engagement portion 97.. First elastic holding portion 98... Second elastic holding portion 100. Display device, 100a, image display area, 180, optical sheet, 181, hole in optical sheet, 326, convex portion of second frame

Claims (10)

A first frame;
A light guide plate disposed over the first frame;
An optical sheet disposed on the opposite side of the first frame with respect to the light guide plate;
A second frame disposed on the opposite side of the light guide plate with respect to the optical sheet, and covering an outer edge of the optical sheet;
A light source support member disposed between the first frame and the second frame;
A lighting device comprising:
Wherein one of the outer edge of the optical sheet, only the upper side of the protrusion provided so as to overlap with the projecting said light source support member from at least one of the first frame and the second frame, formed on the optical sheet An illuminating device comprising an engaging portion that fits into the formed hole.   The lighting device according to claim 1, wherein the light source support member has a concave step portion, and the convex portion enters the step portion. On the side of the upper side is further claim 1, wherein the first elastic holding portion which the first elastic member provided in the second frame is pressed with elasticity the optical sheet on the light guide plate is provided Or the illuminating device of 2 . Wherein the side of the lower side of the optical sheet, claims, characterized in that the second elastic holding part in which the second elastic member presses with elastic the optical sheet on the light guide plate provided on the second frame is provided 3. The lighting device according to 3 . The lighting device according to claim 4 , wherein the second elastic holding portion has a pressing force weaker than that of the first elastic holding portion.   The lighting device according to claim 3, wherein the first elastic member extends along the upper side. The lighting device according to claim 3, wherein the first elastic member is divided into a plurality in the extending direction of the upper side.   The lighting device according to claim 1, wherein the convex portion is provided on the second frame. A liquid crystal display device comprising the illumination device according to any one of claims 1 to 8,
A liquid crystal display device, wherein a liquid crystal panel is provided on a side opposite to the light guide plate with respect to the optical sheet. An electronic apparatus comprising the liquid crystal display device according to claim 9.