JP2008047481A - Luminaire, liquid crystal device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce variation in brightness and chrominance of a luminaire. <P>SOLUTION: The luminaire 10 comprises an almost rectangular first lightguide 13, a second lightguide 12 which is arranged along any one side of the first lightguide and emits light to the first lightguide, and a single light emitting element 11 for emitting light to the second lightguide. The second lightguide is arranged to face the light emission surface of the light emitting element, and has such wedge shape as becomes narrower in width when coming away from the facing surface along the side. It guides the light emitted from the light emitting element along the side while dispersing it in the direction along the side, so that the light is polarized in the propagation direction across the side. The first lightguide guides the light emitted from the second lightguide in the propagation direction while dispersing it in the propagation direction, so that the light is polarized in the emission direction across the side and the propagation direction, constituting a surface-type light source. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting device, a liquid crystal device, and an electronic apparatus, and more particularly to a structure of a lighting device including a light emitting element and a light guide that guides light emitted from the light emitting element.

  In general, a backlight disposed behind a liquid crystal display is used as a lighting device for the liquid crystal display, and a relatively small backlight has a light emitting element such as an LED disposed opposite to an end face of a light guide plate. A sidelight type lighting device is often used.

In such a sidelight type illumination device, an illumination method is known in which light emitted from a point light source is introduced into a light pipe to spread the light in the width direction, and this light is introduced into a light guide plate. (For example, refer to Patent Document 1 below). Further, a device having a front light in which point light sources such as LEDs are respectively disposed at both ends of the light pipe and light is introduced from the light pipe to the light guide plate, and a liquid crystal display disposed behind the front light. Is known (see, for example, Patent Documents 2 and 3 below).
JP 2002-324407 A JP 2002-269056 A JP 2001-345006 A

  In the conventional sidelight type illumination device, when the number of the light emitting elements 1 constituting the point light source is small as shown in FIG. 12, it is sufficient between the light emitting element 1 and the light emitting area L of the light guide plate 2. If the dead area D is not secured, there is a problem that unevenness occurs in the illumination light emitted from the light exit surface 2a of the light guide plate 2. In particular, the reverse is provided on the light guide plate 2 having a prism protruding toward the light exit surface 2a. When an optical sheet having a prism structure is arranged, unevenness in illuminance appears remarkably. In addition, when a plurality of light emitting elements 1 are arranged in the width direction along the end face of the light guide plate as shown in FIG. 13, the light emitting surface of the light guide plate 2 is caused by variations in luminance and chromaticity between the light emitting elements 1. There is a problem that variation occurs in the luminance and chromaticity of the illumination light on 2a. Furthermore, as shown in FIG. 14, when light is introduced into the light guide plate 2 through the light pipe 2 ', it is possible to reduce variations in luminance and chromaticity, while reducing the light use efficiency. However, there is a problem that the luminance is lowered.

  By the way, the sidelight type illumination device described above may be used as a backlight in a liquid crystal device including a liquid crystal display 4 as shown in FIGS. 15 and 16. In this case, the liquid crystal display body 4 is arranged on the light emitting side of the illumination device 3 including the light emitting element 1 and the light guide plate 2 in an overlapping manner. In addition, a wiring board 5 made of a flexible wiring board (FPC) or the like passes through the side of the lighting device 3 and is pulled to the back of the liquid crystal display body 4. Here, in the illustrated example, the wiring board 5 is conductively connected to a control board 6 disposed behind the lighting device 3. In such a configuration, since the wiring substrate 5 passes outside the light emitting element 1 in the lighting device 3, the heat generated by the light emitting element 1 is not easily dissipated by the wiring substrate 5. There is a possibility that the environmental temperature rises and promotes deterioration, and when a plurality of light emitting devices 1 are arranged as shown in the illustrated example, variations in luminance and chromaticity are caused by differences in environmental temperature. There is also a risk of increase.

  Therefore, the present invention solves the above-described problems, and its problem is to provide an illuminating device that can reduce variations in luminance and chromaticity due to light emission characteristics of a light emitting element and light guide characteristics of a light guide. It is to be realized.

  In view of such a situation, the lighting device of the present invention is arranged along one side of a substantially rectangular first light guide unit and the first light guide unit and emits light to the first light guide unit. Two light guide parts and a single light emitting element that emits light to the second light guide part, and the second light guide part is disposed to face the light emitting surface of the light emitting element, and A wedge shape whose width becomes narrower as it goes away from the surface along the one side, and guides the light emitted from the light emitting element along the one side while dispersing it in the direction along the one side and intersecting the one side. The first light guide unit guides the light emitted from the second light guide unit to the propagation direction and disperses the light in the propagation direction, thereby the one side direction and the propagation direction. The planar light source is configured by deflecting light in the emission direction intersecting with the surface light source.

  According to the present invention, the light emitted from the single light emitting element is dispersed by the second light guide unit and then dispersed in the propagation direction by the first light guide unit to be emitted as a planar light source. Thus, variations in luminance and chromaticity can be reduced, and uniform illumination light can be obtained.

  In the present invention, the light emitting element is disposed at a corner of a planar range along the one side direction and the propagation direction, and is provided on a light emitting surface facing the second light guide unit and on the opposite side of the light emitting surface. It is preferable that the mounting surface is in thermal contact with the radiator. According to this, the light emitting element has a mounting surface provided on the opposite side of the light emitting surface, and the mounting surface is in thermal contact with the heat radiating body, so that heat generated in the light emitting element is efficiently radiated. The light emitting element is conducted to the body, and is in thermal contact with the heat dissipating element disposed on the outside, and is disposed at the corner of the plane range along the one side direction and the propagation direction, thereby radiating heat to the outside. Therefore, deterioration of the light-emitting element due to heat, or changes with time in luminance and chromaticity can be reduced. Therefore, variations in luminance and chromaticity due to the light emission characteristics of the light emitting elements and the light guide characteristics of the light guide can be reduced, and at the same time, the heat dissipation characteristics of the heat generated from the light emitting elements can be improved.

  In the present invention, it is preferable that the heat dissipating body constitutes a heat dissipating case surrounding the light emitting element, the first light guide unit, and the second light guide unit. According to this, since the heat radiator constitutes a case body surrounding the light emitting element, the first light guide portion, and the second light guide portion, the housing function can be combined and the heat dissipation can be achieved. It can be further increased.

  In the present invention, a light source substrate on which the mounting surface of the light emitting element is mounted is further provided, the light source substrate is in thermal contact with the heat radiator via a heat conducting member, and the heat radiator is the light emitting element. It is preferable that an opening is provided at a position adjacent to the mounting surface of the element, and the light source substrate is led out of the heat radiating body through the opening. According to this, the light source board on which the light emitting element is mounted is in thermal contact with the heat radiating body, and the light source board is led out through the opening of the heat radiating body, thereby ensuring the heat dissipation of the light emitting element and the heat radiating body. It becomes possible to supply electric power to the light-emitting element from the outside.

  Next, a liquid crystal device according to the present invention includes any one of a liquid crystal display, a first light guide that emits light to the liquid crystal display disposed to face the liquid crystal display, and the first light guide. A second light guide part disposed along one side and emitting light to the first light guide part, and a single light emitting element emitting light to the second light guide part, and the second The light guide unit is disposed opposite to the light emitting surface of the light emitting element, has a wedge shape that becomes narrower as the distance from the facing surface extends along the one side, and emits light emitted from the light emitting element to the one side. The first light guide unit guides the light emitted from the second light guide unit and propagates the light in the propagation direction intersecting the one side. While deflecting in the propagation direction, the light is deflected in the one-side direction and the emission direction intersecting the propagation direction. So, a liquid crystal device characterized by forming the planar light source. According to the present invention, it is possible to reduce variations in luminance and chromaticity caused by the light emission characteristics of the light emitting element and the light guide characteristics of the light guide.

  In the present invention, the light emitting element is disposed at a corner of a planar range along the one side direction and the propagation direction, and is provided on a light emitting surface facing the second light guide unit and on the opposite side of the light emitting surface. It is preferable that the mounting surface is in thermal contact with the radiator. According to this, the heat dissipation characteristic generated from the light emitting element can be improved.

  In the present invention, it further includes a wiring board mounted on the liquid crystal display body, and the wiring board is outside the first light guide part or the second light guide part at a portion outside the corner of the planar range. It is preferable that it is routed behind through. According to this, since the wiring board does not cover the housing location of the light emitting element from the outside, the heat dissipation of the light emitting element is not easily hindered by the wiring board. Can be suppressed.

  In the present invention, it further includes a wiring board mounted on the liquid crystal display body, the wiring board passes through the outside of the second light guide unit and is routed behind, and the light emitting element passes through the wiring board. It is preferable to be installed at a position outside the range of the one side. According to this, even if the wiring board passes through the outside of the second light guide unit, the wiring board is located outside the range of one side through which the wiring board passes. Since it does not cover from the outside, the heat dissipation of the light emitting element can be secured.

  Furthermore, an electronic apparatus according to the present invention includes any one of the liquid crystal devices described above. According to this, it is possible to reduce variations in luminance and chromaticity due to the light emission characteristics of the light emitting element and the light guide characteristics of the light guide, and to improve the dissipation characteristics of heat generated from the light emitting element. Variations in brightness and chromaticity of the screen of the display body and changes with time can be suppressed.

[Lighting device]
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a plan view showing an embodiment of a lighting device according to the present invention. The illuminating device 10 includes a light-emitting element 11 formed of an LED (light-emitting diode) or the like, and a second light guide (light pipe) 12 including a light incident surface 12 a that faces or abuts against the light-emitting surface 11 a of the light-emitting element 11. And a first light guide (light guide plate) 13 having a light incident surface 13a facing or abutting against the light exit surface 12b of the second light guide 12.

  Here, the second light guide 12 is made of a light-transmitting material such as acrylic resin or polycarbonate resin, and the light emitted from the light emitting surface 11a of the light emitting element 11 is transmitted in the width direction (right direction in the drawing) W (the first to be described later). 1) The light guide 13 is dispersed in the width direction by being gradually deflected in the propagation direction (upward direction in the figure) F while propagating in the direction along one side where the light incident surface is formed (the same applies hereinafter). It is configured to lead to the second light guide 13. In the illustrated example, the second light guide 12 is configured in a wedge shape from the light incident surface 12a provided at one end toward the opposite end, and the propagation direction F is determined by the rear surface 12c opposite to the light exit surface 12b. The light is deflected. Here, the rear surface 12c may be provided with an appropriate concavo-convex structure to exhibit the deflection characteristics, or may exhibit the deflection characteristics by a total reflection action by an integral inclined surface.

  The first light guide 13 is made of a light-transmitting material such as acrylic resin or polycarbonate resin, is configured in a rectangular plate shape in plan view, and propagates from a light incident surface 13a configured by one end surface (lower end surface in the drawing). Light enters F and propagates in the same direction F. Then, the internally propagating light is gradually deflected in the light emitting direction (direction orthogonal to the paper surface of the drawing) and is emitted from the light emitting surface 13b (the front surface in the drawing). As means for deflecting the internally propagating light traveling in the propagation direction F in the light emitting direction, for example, a concavo-convex structure or a printed layer formed on the back surface 13c (surface on the far side in the drawing) on the opposite side of the light emitting surface 13b. Is mentioned.

  A reflection sheet 14 made of a white polyethylene sheet or the like is disposed behind the first light guide 13 so that light leaked from the back surface 13c is emitted from the light exit surface 13b. The reflection sheet 14 is preferably disposed on the back side of the light emitting element 11 and the second light guide 12, and also faces the end surfaces of the second light guide 12 and the first light guide 13. It is desirable to be provided.

  The light emitting element 11, the second light guide body 12, and the first light guide body 13 are supported by a heat radiating body (rear chassis) 15 having a good thermal conductivity such as aluminum. The heat radiating body 15 is configured in a case shape that covers the back and side surfaces of the light emitting element 11, the second light guiding body 12, and the first light guiding body 13, and has an opening that exposes at least the light emitting surface 13b. 11, the second light guide 12 and the first light guide 13 are preferably accommodated.

  A mounting surface 11 b is provided on the opposite side of the light emitting element 11 from the light emitting surface 11 a, and the light emitting element 11 is mounted on the light source substrate 16 with the mounting surface 11 b facing the light source substrate 16. The light source substrate 16 is in thermal contact with the inner surface of the side plate portion 15s of the radiator 15 via a heat conductive member 17 made of a heat conductive tape, a heat radiation grease, a heat conduction rubber or the like. In particular, the light source substrate 16 is preferably fixed to the radiator 15 by adhesion or the like with a heat conductive member 17 or the like.

  In this embodiment, the light emitted from the single light emitting element 11 becomes a light source (linear light source) extended in the width direction W by the second light guide 12 and intersects the width direction W (illustrated example). The light is emitted in the propagation direction F that is orthogonal to the light, and the light emitted from the second light guide 12 is incident on the first light guide 13 and propagates in the propagation direction F, and in the width direction W and the propagation direction F. The light is emitted in a light emission direction that intersects (orthogonally in the illustrated example) with respect to the first light guide 13, thereby becoming a planar light source. By being configured in this way, it is possible to avoid unevenness in luminance and chromaticity of illumination light due to variations in luminance and chromaticity between a plurality of light emitting elements, and to reduce the distance between the light emitting elements and the light emitting area. The resulting luminance non-uniformity can also be avoided. Therefore, the non-uniformity of the illumination light resulting from the light emission characteristics of the light emitting element 11 and the light guide characteristics of the second light guide 12 and the first light guide 13 can be reduced.

  Further, in the present embodiment, the light emitting element 11 is generated in the light emitting element 11 because the mounting surface 11 b opposite to the light emitting surface 11 a is in thermal contact with the heat radiator 15 via the light source substrate 16 and the heat conducting member 17. The transmitted heat is efficiently transmitted to the heat radiating body 15. Specifically, a light-emitting unit (not shown) (for example, a light-emitting layer in the case of an LED or organic EL) is fixedly disposed near the mounting surface 11b inside the light-emitting element 11, and the heat of the light-emitting unit is mounted on the mounting surface. 11b is efficiently discharged. In addition, the light emitting element 11 is disposed at a corner of a planar range along the width direction W and the propagation direction F of the lighting device 10, and is in thermal contact with the radiator 15 at the corner. As a result, the heat generated in the light emitting element 11 is efficiently dissipated from the corners of the radiator 15 to the outside. Therefore, since the increase in the environmental temperature of the light emitting element 11 is suppressed, it is possible to reduce deterioration of the light emitting element 11 due to heat, or changes with time in luminance and chromaticity due to heat.

  Further, in the present embodiment, by using the light emitting element 11 (so-called top view type light emitting element) having the mounting surface 11b on the opposite side of the light emitting surface 11a, the heat dissipation of the light emitting element 11 itself is improved. Therefore, a single light-emitting element 11 is sufficient, for example, an element having a large light emission amount, such as a power LED (a power consumption exceeding 0.5 W, for example, 0.5 to 1.0 W) can be used. Brightness can be obtained. In the illustrated light emitting element 11, a chip constituting a light emitting portion (light emitting layer) is mounted on a support substrate (frame) made of aluminum or the like, and the outer surface of the support substrate is the mounting surface 11 b or the support surface behind it. This is a surface-mounted light-emitting element. In this type of light emitting element, the thickness seen in the light emission direction (width direction W in the figure) can be reduced, so that the end of the first light guide 13 is seen in the width direction W as shown in the figure. Even when the light emitting element 11 is arranged outside, there is an advantage that an increase in the outer dimension of the lighting device 10 due to the thickness of the light emitting element 11 can be suppressed.

  FIG. 2 is a plan view showing another embodiment having a configuration basically similar to that of the above embodiment. In the embodiment shown in FIG. 1, the second light guide 12 is disposed along the short side of the first light guide 13, and the width direction W is the direction along the short side of the first light guide 13, the propagation. Although the direction F is a direction along the long side of the first light guide 13, in this embodiment, the second light guide 12 is disposed along the long side of the first light guide 13 and has a width. The direction W is the direction along the long side of the first light guide 13, and the propagation direction F is the direction along the short side of the first light guide 13. Even with such a configuration, the above-described effects can be achieved in exactly the same manner.

  FIG. 3 is a plan view showing still another embodiment. In this embodiment, a second light guide 18A corresponding to the second light guide 12 in each of the above embodiments and a first light guide 18B corresponding to the first light guide 13 are integrally provided. A light body 18 is provided. The light guide 18 is made of a transparent material such as acrylic resin or polycarbonate resin. The second light guide 18A disperses the light emitted from the light emitting element 11 in the width direction W and emits it in the propagation direction F, and the first light guide 18B enters from the second light guide 18A and propagates in the propagation direction F. It is the same as that of the said embodiment in the point which disperse | distributes the light which propagates to a propagation direction, and is radiate | emitted as a planar light source to a light-projection direction. In the present embodiment, since the second light guide 18A and the first light guide 18B are integrally formed, the number of parts is reduced, and the second light guide 18A and the first light guide 18B are reduced. The optical loss that occurs between the two is also reduced.

[Liquid Crystal Display]
FIG. 4 is a schematic cross-sectional view showing the structure of the liquid crystal display 20 that can be used in each of the above embodiments. The liquid crystal display 20 is formed by bonding transparent substrates 21 and 22 made of glass, plastic, or the like with a sealing material 23, and enclosing a liquid crystal 24 between the substrates. Electrodes 21a and 22a are formed on the inner surfaces of the transparent substrates 21 and 22, respectively, and a planar area where these electrodes 21a and 22a face each other is a pixel area. On one substrate, there is provided a color filter 22c (formed on the transparent substrate 22 in the illustrated example) having a colored layer formed in accordance with the pixel region. In addition, alignment films 21 d and 22 d are formed on the surfaces of the transparent substrates 21 and 22 that are in contact with the liquid crystal 24. Further, polarizing plates 25 and 26 are disposed (attached) on the outer surfaces of the transparent substrates 21 and 22 of the liquid crystal display body 20.

  The transparent substrate 21 is provided with a substrate extending portion 21T extending outward from a region facing the transparent substrate 22, and an electronic component 27 such as an integrated circuit chip is mounted on the substrate extending portion 21T as necessary. The The electronic component 27 is, for example, an IC in which a liquid crystal driving circuit is configured. Further, an end 31 of a wiring board 30 made of a flexible wiring board (FPC) or the like is mounted on the board overhanging portion 21T. The wiring board 30 is for supplying a driving potential, signal data, and the like to the liquid crystal display body 20.

[Liquid Crystal Device]
The liquid crystal display 20 is arranged in such a manner that the display area AD overlaps with the light exit surface of the first light guide 13 or the first light guide 18B of the illumination device 10 described above. A predetermined image is displayed by controlling the light transmittance for each pixel. Accordingly, the variation in luminance and chromaticity within the illumination area AL of the illumination device 10 is reduced, so that the quality of the image displayed in the display area AD is improved. In addition, the quality of the image is stabilized by suppressing deterioration of the lighting device 10 due to heat or changes in luminance and chromaticity over time due to heat. Furthermore, since the luminance of the light emitting element 11 can be increased, a bright image can be realized while reducing variations in luminance and chromaticity. In addition, since the temperature rise due to the heat generation of the light emitting element 11 is suppressed by improving the heat dissipation, the influence on the image quality caused by heat can also be reduced.

[Example]
Next, the structure of a more specific example having the configuration of the above embodiment will be described in detail with reference to FIGS. In the illumination device 10 of this example, the same reference numerals are given to portions corresponding to the previous embodiment, and detailed description of the common configuration is omitted. FIG. 5 is an exploded perspective view of the lighting device 10, FIG. 6 is a schematic perspective view with a part cut away, and FIG. 7 is a schematic perspective view showing the back side.

  The lighting device 10 includes the light emitting element 11, the second light guide 12, the first light guide 13, the reflection sheet 14, the heat radiating body 15, the light source substrate 16, and the heat conducting member 17, and the first light guide. On the front surface side (observation side) of the 13 light exit surfaces 13b, optical sheets such as a light diffusing plate OP1, condensing sheets OP2, OP3, a reflective polarizing plate OP4 and the like are arranged to overlap. FIG. 8 is a sectional view showing the arrangement of these optical sheets in more detail. Here, the light diffusion plate OP1 is composed of a synthetic resin sheet or the like having a light scattering function, and diffuses the illumination light emitted from the light emission surface 13b of the first light guide 13 to increase the in-plane luminance of the illumination light. Has the function of improving uniformity. The condensing sheets OP2 and OP3 are formed in a stripe shape as a whole by periodically forming a prism structure PZ having a triangular cross section (preferably a right isosceles triangle) having an apex angle of 80 to 90 degrees on the front side. It is a prism sheet, and is arranged so that the extending directions of the prism structure PZ are oriented perpendicular to each other.

  Further, the reflective polarizing plate OP4 transmits a first polarization component having a polarization axis directed in a predetermined direction out of the illumination light emitted from the light output surface 13b of the first light guide 13, and the predetermined direction and It has a function of reflecting the second polarization component having orthogonal polarization axes. Then, the first polarized component of the illumination light is transmitted and emitted, and the second polarized component is reflected and returned to the first light guide 13 side. The first polarization component is transmitted and emitted. Therefore, by disposing the reflective polarizing plate OP4, it is possible to radiate the first polarization component as illumination light and to improve the light utilization efficiency compared to the case of disposing a normal absorption type polarizing plate. , Can increase the brightness level. The reflective polarizing plate OP4 can be used in place of the polarizing plate 25 of the liquid crystal display body 20 shown in FIG. Therefore, the reflective polarizing plate OP4 is not an essential configuration for the illumination device 10, and can be omitted when polarized light is not required as illumination light.

  Each component described above is covered with a frame 19 made of synthetic resin, stainless steel or the like from the front side. The frame 19 is fixed to the heat radiating body 15 in a state where the above-described members are accommodated. The frame 19 is provided with an opening area 19a that at least optically exposes an illumination area AL set in a predetermined range of the light emitting surface 13b of the first light guide 13. And each said structural member is accommodated and hold | maintained by the flame | frame 19 and the heat radiator 15 in the up-down direction.

  The heat radiator 15 includes a bottom plate portion 15a that supports the light emitting element 11, the second light guide body 12, and the first light guide body 13 from behind, and a side plate portion 15s that covers the periphery of these from the side. It is configured in a box shape (case shape) with an open front. An opening 15b is formed at a corner of the bottom plate 15a adjacent to a corner of the side plate 15s where the light emitting element 11 of the radiator 15 is disposed, and the light emitting element 11 is mounted through the opening 15b. The light source substrate 16 is led out to the back side of the radiator 15. In the case of the illustrated example, the light source substrate 16 is disposed outside the heat radiating body 15 so as to extend along the back surface of the bottom plate portion 15a.

  The reflection sheet 14 is disposed inside the radiator 15. The reflection sheet 14 includes a bottom portion 14 a disposed on the back side of the second light guide body 12 and the first light guide body 13, and a periphery of the bottom portion 14 a. 14b and a side portion 14s erected by bending or the like, and a bottom portion 14a corresponding to a corner portion where the light emitting element 11 is arranged and a part of the side portion 14s are provided with a notch portion 14t.

  In this embodiment, since the heat radiator 15 is configured in a case shape, the heat radiation efficiency can be increased by increasing the heat radiation area, and at the same time, each of the above constituent members is accommodated and appropriately positioned as necessary. Is possible. In addition, an opening 15a is formed in a portion of the radiator 15 adjacent to the portion where the light emitting element 11 is in thermal contact, and the light source substrate 16 is led out to the back side of the radiator 15 through the opening 15a. The power supply from the outside to the light emitting element 11 can be ensured without reducing heat dissipation as much as possible. The opening 15a does not need to be in the shape of an opening as in the illustrated example, and may be configured in a cutout shape, for example. However, since the opening 15a has a closed hole shape around the opening 15a, it is difficult to hinder heat conduction, so that a reduction in heat dissipation efficiency can be suppressed.

  FIG. 9 is a schematic cross-sectional view showing another configuration example of the arrangement mode of the optical sheet that can be used in the above-described embodiment. In this configuration example, a condensing sheet OP5 is disposed on the light exit surface 13b of the first light guide 13, and a light diffusion plate OP6 is further disposed on the condensing sheet OP5. The light diffusion plate OP6 can be omitted. The condensing sheet OP5 is composed of a transparent sheet having a prism structure PZ ′ protruding toward the second light guide 13. The prism structure PZ ′ has a triangular cross section with an apex angle of 70 to 80 degrees. The prism structure PZ ′ is periodically formed in a posture extending in a direction orthogonal to the propagation direction F, and is configured in a stripe shape as a whole. This condensing sheet OP5 allows light having a relatively large emission angle (angle with respect to the normal of the light emission surface) to be emitted from the light emission surface 13b of the first light guide 13 by the prism structure PZ ′. The light condensing function is refracted closer to the normal direction to reduce the emission angle of the illumination light.

  In said optical sheet structure, the uniformity of the brightness | luminance and chromaticity by the illuminating device 10 of a present Example can be utilized more effectively. That is, in this embodiment, since the luminance and chromaticity of illumination light are highly uniform, even in the light collecting sheet OP5 having the prism structure PZ ′ protruding to the first light guide 13 side, luminance unevenness and color unevenness occur. Hateful. On the other hand, the light collecting sheet OP5 can efficiently collect illumination light having an emission angle larger than that of the light collecting sheets OP2 and OP3 shown in FIG. Even with the single light emitting element 11, the brightness of the illumination light can be secured.

  10 is a schematic perspective view showing a partially cutout liquid crystal device 100 in which the same liquid crystal display body 20 as that shown in FIG. 4 is mounted on the illumination device 10 of the above embodiment, and FIG. 11 is the same liquid crystal device. It is the schematic perspective view which looked at 100 from the back side. In the liquid crystal device 100 of the embodiment, the liquid crystal display body 20 is arranged so that the display area AD overlaps with the opening area 19 a (illumination area AL) of the frame 19. One end portion 31 of the wiring substrate 30 is mounted on the liquid crystal display body 20, and the other end portion 32 of the wiring substrate 30 is disposed behind the lighting device 10 (on the back surface of the bottom plate portion 15 a of the radiator 15). It is mounted on the control circuit board 33. On the control circuit board 33, the light source board 16 led out to the back side of the radiator 15 is also mounted. Although not shown, electronic components (not shown) are mounted on the control circuit board 33, which is not shown.

  In the present embodiment, the wiring board 30 passes through the outside of the side portions of the frame 19 and the radiator 15 and extends to the back side. And the corner | angular part of the illuminating device 10 in which the light emitting element 11 is accommodated is arrange | positioned outside the range through which the wiring board 30 passes. That is, the wiring substrate 30 extends to the back side while avoiding the corner portion of the lighting device 10. As a result, the heat emitted from the light emitting element 11 and transmitted to the heat radiating body 15 is not prevented from being dissipated from the heat radiating body 15 by the wiring board 30, so that sufficient heat dissipation can be ensured.

[Electronics]
Finally, an embodiment of an electronic apparatus equipped with the liquid crystal device will be described with reference to FIG. FIG. 17 is a schematic perspective view showing an appearance of an example of an electronic apparatus according to the invention. The electronic apparatus 1000 in the illustrated example is an in-vehicle car navigation system, and includes a main body 1010 and a display unit 1020 connected to the main body 1010. The main body 1010 is provided with an operation surface 1011 provided with operation buttons and the like, and an inlet 1012 for a recording medium such as a DVD. The liquid crystal device 100 is stored inside the display unit 1020, and the display by the liquid crystal device 100, that is, the display of the navigation image can be visually recognized on the display screen 1020a of the display unit 1020.

  In this electronic apparatus 1000, since the liquid crystal device 100 is mounted, the luminance of the display light emitted from the display screen and variations in its distribution are reduced, so that high display quality can be realized. . Further, since the influence of heat is reduced, a display mode with high brightness, color stability, and high reliability can be ensured.

  Note that the illumination device, the liquid crystal device, and the electronic apparatus of the present invention are not limited to the illustrated examples described above, and it is needless to say that various modifications can be made without departing from the scope of the present invention. For example, the above-described lighting device is not limited to the one mounted on the liquid crystal device as described above, and may be used as a single lighting fixture, or may be integrated with various other devices other than the liquid crystal device. It may be used for.

The schematic plan view which shows embodiment of an illuminating device. The schematic plan view which shows other embodiment of an illuminating device. The schematic plan view which shows another embodiment of an illuminating device. The schematic longitudinal cross-sectional view which shows the example of a liquid crystal display body. The disassembled perspective view of the Example of an illuminating device. The schematic perspective view which notches and shows a part of Example of an illuminating device. The schematic perspective view which shows the back surface of the Example of an illuminating device. The schematic sectional drawing which shows the arrangement | sequence aspect of the optical sheet of the Example of an illuminating device. The schematic sectional drawing which shows the other arrangement | sequence aspect of the optical sheet of the Example of an illuminating device. FIG. 2 is a schematic perspective view showing a part of an embodiment of a liquid crystal device by cutting away. The schematic perspective view which shows the back surface of the Example of a liquid crystal device. The schematic plan view which shows the comparative example of an illuminating device. The schematic plan view which shows the other comparative example of an illuminating device. The schematic plan view which shows another comparative example of an illuminating device. FIG. 6 is a schematic plan view showing a comparative example of a liquid crystal device. The schematic longitudinal cross-sectional view which shows the comparative example of a liquid crystal device. The schematic perspective view which shows the electronic device carrying the Example of a liquid crystal device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Illuminating device, 11 ... Light emitting element, 11a ... Light emission surface, 11b ... Mounting surface, 12 ... 2nd light guide, 13 ... 1st light guide, 14 ... Reflective sheet, 15 ... Radiator, 15a ... Opening Part, 16 ... light source substrate, 17 ... heat conducting member, 18 ... light guide, 18A ... second light guide, 18B ... first light guide, 19 ... frame, 19a ... opening area, 20 ... liquid crystal display, 21, 22 ... Transparent substrate, 23 ... Sealing material, 24 ... Liquid crystal, 27 ... Electronic component, 30 ... Wiring substrate, 33 ... Control circuit board, 100 ... Liquid crystal device

Claims (9)

A substantially rectangular first light guide, a second light guide disposed along one side of the first light guide and emitting light to the first light guide; and the second light guide A single light emitting element that emits light, and
The second light guide portion is disposed opposite to the light emitting surface of the light emitting element, has a wedge shape that becomes narrower as the distance from the facing surface along the one side decreases, and emits light emitted from the light emitting element. Guiding the light along the one side, dispersing the light in the direction along the one side, and deflecting the light in the propagation direction intersecting the one side;
The first light guide unit guides the light emitted from the second light guide unit in the propagation direction, disperses the light in the propagation direction, and deflects the light in the one-side direction and the emission direction intersecting the propagation direction. And a planar light source.   The light emitting element is disposed at a corner of a planar range along the one side direction and the propagation direction, and a light emitting surface facing the second light guide unit and a mounting surface provided on the opposite side of the light emitting surface The lighting device according to claim 1, wherein the mounting surface is in thermal contact with the radiator.   The lighting device according to claim 2, wherein the heat dissipating member constitutes a case body surrounding the light emitting element, the first light guide unit, and the second light guide unit.   The light emitting device further includes a light source substrate on which the mounting surface of the light emitting element is mounted. The light source substrate is in thermal contact with the heat radiating body through a heat conducting member, and the heat radiating body is mounted on the light emitting element. The lighting device according to claim 3, wherein an opening is provided at a position adjacent to the surface, and the light source substrate is led out of the heat radiating body through the opening. A liquid crystal display, a first light guide that emits light to the liquid crystal display disposed to face the liquid crystal display, and the first light guide disposed along one side of the first light guide. A second light guide part that emits light to the light guide part, and a single light emitting element that emits light to the second light guide part,
The second light guide portion is disposed opposite to the light emitting surface of the light emitting element, has a wedge shape that becomes narrower as the distance from the facing surface along the one side decreases, and emits light emitted from the light emitting element. Guiding the light along the one side, dispersing the light in the direction along the one side, and deflecting the light in the propagation direction intersecting the one side;
The first light guide unit guides the light emitted from the second light guide unit in the propagation direction, disperses the light in the propagation direction, and deflects the light in the one-side direction and the emission direction intersecting the propagation direction. And forming a planar light source.   The light emitting element is disposed at a corner of a planar range along the one side direction and the propagation direction, and a light emitting surface facing the second light guide unit and a mounting surface provided on the opposite side of the light emitting surface The liquid crystal device according to claim 5, wherein the mounting surface is in thermal contact with the radiator.   The circuit board further includes a wiring board mounted on the liquid crystal display body, and the wiring board passes through the outside of the first light guide part or the second light guide part at a portion outside the corner of the planar range. The liquid crystal device according to claim 6, wherein the liquid crystal device is drawn behind.   The circuit board further includes a wiring board mounted on the liquid crystal display body, the wiring board passes through the outside of the second light guide unit and is routed to the back, and the light emitting element is disposed on the one side through which the wiring board passes. The liquid crystal device according to claim 5, wherein the liquid crystal device is installed at a position outside the range. An electronic apparatus comprising the liquid crystal device according to any one of claims 5 to 8.

Images