JP2019153505A - Luminaire, display device and television receiver - Google Patents

Abstract

To restrict the distance between a light source and a light incidence surface and to make use efficiency of light higher.SOLUTION: A luminaire is characterized in comprising: a plurality of LEDs 32 which are arrayed; a light guide plate 50 having a light incidence plane 51 which faces the plurality of LEDs 32 and on which light emitted from the plurality of LEDs 32 impinges and a light emission plane 53 from which the light impinging on the light incidence plane 51 is emitted; and an LED substrate 31 having a longitudinal substrate body part 33 which has the plurality of LEDs 32 arranged and extends in the arrangement direction of the plurality of LEDs 32, and a projection part 34 which is protruded from one lengthwise end part of the substrate body part 33 to the side of the light incidence plane 51, a projection end 39 thereof being arranged on a side closer to the light incidence plane 51 than a plane, on the side of the light incidence plane 51, of the LEDs 32.SELECTED DRAWING: Figure 3

Description

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

  2. Description of the Related Art Conventionally, an illumination device is known in which a light source is arranged in a form facing a light incident surface of a light guide plate (Patent Document 1 below). In the following Patent Document 1, a part of the light source substrate on which the light source is mounted is a restricting portion that protrudes toward the light guide plate, and the restricting portion comes into contact with the light guide plate to restrict the distance between the light source and the light guide plate. It is the composition to do. This prevents the light incident surface of the light guide plate from contacting the light source when the light incident surface of the light guide plate moves to the light source side due to thermal expansion or the like.

International Publication No. 2012/128076

  In Patent Document 1, the restricting portion is provided over the entire length of the upper end portion of the light source substrate. In such a configuration, the light use efficiency is reduced because the light emitted from each light source is blocked by the restricting portion and prevented from entering the light incident surface.

  The present invention has been completed based on the above circumstances, and an object thereof is to regulate the distance between the light source and the light incident surface and to increase the light use efficiency.

  In order to solve the above problems, an illumination device of the present invention includes a plurality of light sources arranged in a row, a light incident surface that faces the plurality of light sources and receives light emitted from the plurality of light sources, A light guide plate having a light exit surface from which light incident from the light entrance surface is emitted, a longitudinal substrate body portion in which the plurality of light sources are arranged and extends along an arrangement direction of the plurality of light sources, The protruding portion is protruded from the longitudinal end of the substrate body to the light incident surface, and the protruding end is disposed closer to the light incident surface than the light incident surface of the light source. And a light source substrate.

  According to the said structure, when a light-guide plate expand | swells, the distance between a light source and a light-incidence surface can be controlled because a light-incidence surface contact | abuts to a protrusion part. Accordingly, it is possible to suppress a situation where the light incident surface contacts the light source and the light source is damaged, or a situation where the light guide plate is melted by heat generated from the light source. Moreover, in the said structure, the increase in a number of parts can be suppressed by making a part of light source board into a protrusion part. If the protruding portion extends along the short side end of the substrate body, the protruding portion blocks the light emitted from the plurality of light sources and prevents the emitted light from entering the light incident surface. Is concerned. In the above configuration, the protrusion is provided at one end in the longitudinal direction of the substrate body. If it does in this way, the situation where the emitted light from a plurality of light sources is blocked by the projection part can be controlled, and the utilization efficiency of light can be made higher.

  According to the present invention, it is possible to regulate the distance between the light source and the light incident surface and to increase the light utilization efficiency.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Exploded perspective view showing schematic configuration of liquid crystal display device Sectional view of the liquid crystal display device (corresponding to the view cut along the line III-III in FIG. 1) Plan view showing the backlight device Sectional drawing of the liquid crystal display device which concerns on Embodiment 2. FIG. Sectional drawing of the liquid crystal display device which concerns on Embodiment 3. FIG. The top view which shows the backlight apparatus which concerns on Embodiment 3. FIG.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 11 with which the television receiver 10 is provided is illustrated as a display device. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Further, the upper side shown in FIG. 3 is the front side, and the lower side shown in FIG. 3 is the back side. As shown in FIG. 1, the television receiver 10 includes a liquid crystal display device 11, cabinets 12 and 13 on both sides of the liquid crystal display device 11 that are accommodated so as to sandwich the liquid crystal display device 11, a power source 14, a tuner 15, and a stand 16. Prepare. The liquid crystal display device 11 (display device) has a horizontally long rectangular shape (rectangular shape, longitudinal shape) as a whole, and is accommodated in a vertically placed state. That is, the liquid crystal display device 11 is arranged in an upright posture with the short side direction along the vertical direction. In this embodiment, the Y-axis direction coincides with the vertical direction and the short side direction of the liquid crystal display device 11.

  As shown in FIG. 2, the liquid crystal display device 11 includes a liquid crystal panel 17 that is a display panel and a backlight device 18 (illumination device) that is an external light source, and these are integrally formed by a frame-like bezel 19. It is supposed to be retained. The liquid crystal panel 17 can display an image using light emitted from the backlight device 18. As shown in FIG. 2, the liquid crystal panel 17 has a horizontally long rectangular shape (rectangular shape) in plan view, and a pair of glass substrates (array substrate and CF substrate) excellent in translucency are predetermined. The substrates are bonded together with a gap therebetween, and liquid crystal is sealed between both substrates. The array substrate is provided with a switching element (for example, TFT) connected to the source wiring and the gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. 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 are provided. The liquid crystal panel 17 is divided into a display area on the center side of the screen where an image 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. Yes. Note that a pair of front and back polarizing plates are respectively attached to the outer surface sides of the pair of substrates.

  As shown in FIG. 2, the backlight device 18 includes a chassis 21 having a light-emitting portion 20 that opens toward the front side (light emission side, liquid crystal panel 17 side), and a light emission of the chassis 21. The optical member 22 disposed so as to cover the portion 20, the pair of LED units 30 and 30, and the light from the pair of LED units 30 and 30 are guided to the optical member 22 (and thus the liquid crystal panel 17). And a frame 26 (pressing member) for pressing the light guiding plate 50 and the optical member 22 from the front side. Each of the LED units 30 and 30 includes an LED substrate 31 (light source substrate) and a plurality of LEDs 32 (Light Emitting Diodes). The backlight device 18 is a so-called edge light type in which LED units 30 and 30 are respectively disposed at both ends on the long side, and a light guide plate 50 is sandwiched between the pair of LED units 30 and 30. Sidelight type). In the backlight device 18, the LED unit 30 may be disposed only at one end portion on the long side, or the LED unit 30 may be disposed on the short side. In the following description, each component of the backlight device 18 will be described in detail.

  The chassis 21 (accommodating member) is made of, for example, a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC), and as shown in FIG. The short side direction coincides with the Y-axis direction (vertical direction). The chassis 21 includes a bottom plate 23 having a horizontally long square shape, and side plates 24 rising from the outer ends of the long side and the short side of the bottom plate 23. Among the four side plates 24, LED substrates 31, 31 are arranged along a pair of side plates 24, 24 arranged on the long side. A frame 26 and a bezel 19 are screwed to each side plate 24. A pair of LED units 30 and 30 and a light guide plate 50 are accommodated in the chassis 21.

  As shown in FIG. 2, the optical member 22 has a horizontally long rectangular shape in plan view, like the liquid crystal panel 17. The optical member 22 is placed on the front side (light emitting side) of the light guide plate 50, and transmits the light emitted from the light guide plate 50 toward the liquid crystal panel 17 while giving a predetermined optical action to the transmitted light. Let it emit. The optical member 22 is composed of a plurality of (three in the present embodiment) sheet-like members that are stacked on each other. Specific types of the optical member 22 (optical sheet) include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used. As shown in FIG. 2, the frame 26 is formed in a frame shape (frame shape) extending along the outer peripheral end portion of the light guide plate 50, and the outer peripheral end portion of the light guide plate 50 extends from the front side over substantially the entire circumference. It is possible to hold down. The frame 26 is made of, for example, a synthetic resin and has a light-shielding property because the surface has a form of black, for example. The frame 26 can receive the outer peripheral edge of the liquid crystal panel 17 from the back side.

  The light guide plate 50 is made of a synthetic resin material (for example, acrylic resin such as PMMA, polycarbonate, or the like) that has a refractive index sufficiently higher than air and is substantially transparent (excellent in translucency). As shown in FIG. 2, the light guide plate 50 has a horizontally long rectangular shape in plan view, like the liquid crystal panel 17 and the chassis 21. The long side direction of the light guide plate 50 coincides with the X-axis direction, the short side direction coincides with the Y-axis direction, and the plate thickness direction perpendicular to the plate surface coincides with the Z-axis direction. As shown in FIGS. 2 and 3, the light guide plate 50 has a pair of light incident surfaces 51, 51 and a light emitting surface 53 that is a front side plate surface (one plate surface). The light incident surface 51 is an end surface on the long side, and includes a surface facing the LED unit 30 (more specifically, the light emitting surface 35 of the LED 32 constituting the LED unit 30), and is emitted from each LED 32 of the LED unit 30. This is the surface where the incident light enters. The plurality of LEDs 32 (light sources) included in the LED unit 30 are arranged at equal intervals along the light incident surface 51. The light guide plate 50 has a function of raising the light incident from the pair of light incident surfaces 51 and 51 so as to be directed toward the optical member 22 side (front side) while being propagated inside and emitting the light from the light emitting surface 53.

  As shown in FIG. 3, a light reflecting sheet 55 capable of reflecting the light emitted from the plate surface 54 to the outside of the light guide plate 50 on the front side is almost entirely covered on the back surface 54 of the light guide plate 50. It is provided in a covering form. The light reflection sheet 55 is disposed between the bottom plate 23 of the chassis 21 and the light guide plate 50. In addition, a light reflecting portion that promotes emission from the light emitting surface 53 by reflecting light incident on the light guiding plate 50 toward the light emitting surface 53 on the plate surface 54 (the other plate surface) of the light guiding plate 50. (Not shown) is formed. The light reflecting portion is configured by a plurality of dots, and can reflect the light incident on the light guide plate 50 to the light emitting surface 53 side while scattering the light reaching the plate surface 54. As a result, light that is scattered and reflected by the light reflecting portion and travels toward the light exit surface 53 generates light whose incident angle with respect to the light exit surface 53 does not exceed the critical angle (light that breaks total reflection). As a result, light can be emitted from the light emitting surface 53 to the outside.

  The LED 32 of the LED unit 30 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 31. 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. The configuration of the LED 32 is not limited to the above. The LED 32 is a so-called top surface light emitting type in which a surface opposite to the mounting surface with respect to the LED substrate 31 is a light emitting surface 35.

  As shown in FIG. 2, the LED substrate 31 has an elongated plate shape extending along the long side direction of the chassis 21, and is arranged in a posture in which the plate thickness direction orthogonal to the plate surface coincides with the Y-axis direction. ing. As a material used for the base material of the LED substrate 31, for example, a metal or a synthetic resin material (specifically, paper phenol or glass epoxy resin) can be used. A heat radiating plate 36 is arranged along the inner surface of the chassis 21. The heat radiating plate 36 is made of metal excellent in heat dissipation, and includes a bottom plate portion 37 fixed to the bottom plate 23 of the chassis 21, and a side plate portion 38 that rises from the edge of the bottom plate portion 37 in the Y-axis direction to the front side. . The LED substrate 31 is attached to the side plate portion 38 of the heat radiating plate 36. That is, the heat sink 36 has a function of a support member that supports the LED substrate 31.

  The LED substrate 31 includes a substrate body 33 and a pair of protrusions 34 and 34, and has a substantially U shape opened to the light guide plate 50 side in a front view (see FIG. 4). The substrate body 33 has a longitudinal shape in which a plurality of LEDs 32 are arranged in a line and extend along the direction in which the plurality of LEDs 32 are arranged. A plurality of LEDs 32 are arranged in a line on the mounting surface of the substrate body 33 along the length direction (X-axis direction) with a predetermined arrangement interval. As shown in FIG. 4, the protrusions 34 are provided at both ends of the substrate body 33 in the longitudinal direction. The protruding portion 34 is formed by bending one end portion of the base material constituting the LED substrate 31, and is bent at a right angle with respect to the substrate main body portion 33. As shown in FIGS. 3 and 4, the protruding portion 34 protrudes from the one end portion in the longitudinal direction of the substrate main body portion 33 toward the light incident surface 51. The protruding end 39 (see FIG. 3) of the protruding portion 34 is disposed closer to the light incident surface 51 than the surface (light emitting surface 53) of the LED 32 on the light incident surface 51 side.

  The protrusion 34 has a plate shape that covers the LED 32 from one end side in the longitudinal direction of the substrate body 33, and in the short side direction (Z-axis direction, vertical direction in FIG. 3) of the substrate body 33. Is set to a value larger than the length L2 of the LED 32. The protruding end 39 of the protruding portion 34 is in contact with the light incident surface 51 over the entire length in the Z-axis direction (the short side direction of the substrate body 33). Further, as shown in FIG. 4, the protruding portion 34 is disposed outside the light distribution range A1 of the LED 32. In FIG. 4, an example of the light distribution range A1 of the LEDs 32 arranged on both ends of the plurality of LEDs 32 is indicated by a one-dot chain line. For example, a white reflective layer (not shown) is formed on the surface of the LED substrate 31. This reflection layer can reflect the light emitted from the LED 32 and returned to the LED substrate 31 side.

  As shown in FIG. 4, among the four side plates 24 of the chassis 21, spacer members 27 are arranged between the pair of side plates 24, 24 arranged on the short side and the light guide plate 50, respectively. . The light guide plate 50 is positioned in the X-axis direction by the spacer member 27. The light guide plate 50 is positioned in the Y-axis direction by the pair of LED substrates 31 and 31.

  Next, the effect of this embodiment will be described. According to this embodiment, when the light guide plate 50 expands, the distance between the LED 32 and the light incident surface 51 can be regulated by the light incident surface 51 coming into contact with the protruding portion 34. Thereby, the situation where the light incident surface 51 contacts the LED 32 and the LED 32 is damaged, or the situation where the light guide plate 50 is melted by the heat generated from the LED 32 can be suppressed. Moreover, in the said structure, the increase in a number of parts can be suppressed by making a part of LED board 31 into the protrusion part 34. FIG. In addition, if the protrusion 134 (shown by a two-dot chain line in FIG. 3) extending along the short-side end of the substrate body 33 is provided, such a protrusion 134 is emitted from the plurality of LEDs 32. There is a concern that a situation where the outgoing light enters the light incident surface 51 is blocked. In the above configuration, the protrusions 34 are provided at one end and the other end of the substrate body 33 in the longitudinal direction. If it does in this way, the situation where the emitted light from a plurality of LED32 is blocked by projection part 34 can be controlled, and the utilization efficiency of light can be made higher.

  Further, in the present embodiment, the protrusion 34 has a plate shape that covers the LED 32 from one end side in the longitudinal direction of the substrate body 33, and the length of the protrusion 34 is short in the short side direction of the substrate body 33. The value is set larger than the length of the LED 32. With such a configuration, the LED 32 can be reliably covered from the one end side in the longitudinal direction of the substrate body 33 by the protrusion 34. Thereby, the situation where the emitted light from the LED 32 leaks outside in the longitudinal direction of the LED substrate 31 can be suppressed. Further, the protruding end 39 of the protruding portion 34 is in contact with the light incident surface 51 over the entire length in the short side direction of the substrate body 33. With such a configuration, it is possible to suppress a situation in which a gap is generated between the protruding portion 34 and the light incident surface 51, and it is possible to suppress a situation in which emitted light from the LED 32 leaks to the outside in the longitudinal direction of the LED substrate 31 from the gap. .

  In the present embodiment, the protrusions 34 are provided at both ends of the substrate body 33 in the longitudinal direction. The distance between the plurality of LEDs 32 and the light guide plate 50 can be more reliably regulated over the entire length of the substrate body 33 by the pair of protrusions 34 and 34 coming into contact with the light incident surface 51. Further, the protruding portion 34 is disposed outside the light distribution range A1 of the LED 32. The situation where the light emitted from the LED 32 is blocked by the protrusion 34 can be more reliably suppressed.

  In the present embodiment, the light incident surface 51 is configured by the end surface of the light guide plate 50, and the light emitting surface 53 is configured by the plate surface of the light guide plate 50. When the light guide plate 50 is thermally expanded, the plate surface direction is easily expanded as compared with the plate thickness direction. For this reason, when the light incident surface 51 is constituted by the end surface of the light guide plate 50, the amount of displacement of the light incident surface 51 due to thermal expansion tends to increase. In the said structure, since the distance between LED32 and the light-guide plate 50 can be controlled, it is suitable.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. In the backlight device 218 of the present embodiment, the configuration of the LED substrate 231 is different from that of the above embodiment. As shown in FIG. 5, an extended portion 239 extending to the outside of the chassis 21 is provided at one end (the lower end in FIG. 5) in the short side direction of the substrate main body portion 33. The extended portion 239 is inserted through a through hole 221 formed in the chassis 21 (accommodating member), and a part 240 of the extended portion 239 is disposed outside the chassis 21. A heat radiating plate 236 is attached to the outer surface of the chassis 21. A part 240 of the extending portion 239 extends along the plate surface of the bottom plate 23 of the chassis 21 and is arranged in contact with the heat radiating plate 236. With such a configuration, heat generated by driving the LED 32 can be radiated to the outside of the chassis 21 through the substrate body 33 and the extending portion 239, and thermal expansion of the light guide plate 50 is suppressed. be able to.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. In the backlight device 318 of this embodiment, the configuration of the light guide plate 350 is different from that of the above embodiment. In the light guide plate 350 of the present embodiment, the light exit surface 353 is configured by the front side surface of the light guide plate 350, and the light incident surface 351 is the light exit surface 353 in the light guide plate 350 as shown in FIGS. It is comprised by the peripheral edge part of the plate surface on the opposite side. The LED unit 330 is housed in a recess 324 formed in the bottom plate 323 of the chassis 321. The LED 32 included in the LED unit 330 is arranged such that the light emitting surface 35 faces the front side. The light emitting surface 35 is disposed to face the light incident surface 351. The light emitted from the light emitting surface 35 is incident on the light guide plate 350 from the light incident surface 351, then reflected on the inclined surface 354 of the light guide plate 350, and then propagated inside the light guide plate 350. It has become.

  As shown in FIG. 7, the protrusions 34 of the LED substrate 31 are provided at both ends in the longitudinal direction of the substrate body 34, and protrude from the substrate body 33 toward the light incident surface 351. The protrusion 34 is in contact with the light incident surface 351 at the tip thereof. In the present embodiment, when the light guide plate 350 expands in the thickness direction due to heat, the distance between the LED 32 and the light guide plate 350 can be regulated by the light incident surface 351 coming into contact with the protruding portion 34. . Even when the light guide plate 350 is bent in the thickness direction, the distance between the LED 32 and the light guide plate 350 can be regulated.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above-described embodiment, the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified. However, the present invention can also be applied to display devices using other types of display panels.
(2) In the above embodiment, an LED is used as the light source. However, an organic EL or the like can also be used.
(3) In the above embodiment, the configuration in which the protruding portion of the LED substrate and the light incident surface of the light guide plate are in contact with each other is exemplified, but the present invention is not limited to this. A gap may be provided between the protrusion and the light incident surface of the light guide plate.

DESCRIPTION OF SYMBOLS 10 ... Television receiver, 11 ... Liquid crystal display device (display device), 17 ... Liquid crystal panel (display panel), 18 ... Backlight device (illuminating device) 21,321 ... Chassis (housing member), 31,231 ... LED Substrate (light source substrate), 32... LED (light source), 33... Substrate body portion, 34... Projection, 35 .. light emitting surface (surface on the light incident surface side of the light source), 50 and 350. ... light entrance surface, 53,353 ... light exit surface, 239 ... extension part

Claims (5)

A plurality of light sources arranged in a row,
A light guide plate having a light incident surface facing the plurality of light sources and receiving light emitted from the plurality of light sources; and a light emitting surface from which light incident from the light incident surface is emitted;
The plurality of light sources are arranged and extend in the longitudinal direction of the plurality of light sources along the direction in which the plurality of light sources are arranged, and project from the one end of the substrate body in the longitudinal direction toward the light incident surface. A light source substrate comprising: a light source substrate having an end disposed on a side closer to the light incident surface than a surface on the light incident surface side of the light source. The protruding portion has a plate shape that covers the light source from one end side in the longitudinal direction of the substrate body portion,
The lighting device according to claim 1, wherein a length of the protruding portion is set to a value larger than a length of the light source in a short side direction of the substrate main body portion. A housing member for housing the plurality of light sources, the light guide plate, and the light source substrate;
The lighting device according to claim 1, wherein the substrate body is provided with an extending portion that extends to the outside of the housing member. The lighting device according to any one of claims 1 to 3,
A display panel that displays an image using light emitted from the illumination device.   A television receiver comprising the display device according to claim 4.

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