WO2018139347A1

WO2018139347A1 - Illumination device, display device, and television receiving device

Info

Publication number: WO2018139347A1
Application number: PCT/JP2018/001506
Authority: WO
Inventors: 敬治清水
Original assignee: シャープ株式会社
Priority date: 2017-01-26
Filing date: 2018-01-19
Publication date: 2018-08-02
Also published as: TW201827743A

Abstract

A backlight device (12) is provided with: a red laser light source (17), a blue laser light source (18), and a green laser light source (19) that are laser light sources for producing laser light; a light guide plate (22) in which a section of outer-peripheral edge surfaces thereof that faces the red laser light source (17), the blue laser light source (18), and the green laser light source (19), which are laser light sources, is a laser-light incident section (22a) at which laser light is incident, a section of the outer-peripheral edge surfaces thereof that is located at the opposite side from the laser-light incident section (22a) is a laser-light-incident opposite section (22e), and one of a pair of plate surfaces is a light-emission plate surface (22c) from which light is emitted; and a diffuse reflection member (26) that is attached to the laser-light-incident opposite section (22e) of the light guide plate (22) in a contact manner and that diffusely reflects laser light.

Description

Lighting device, display device, and television receiver

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

As an example of a backlight device used in a conventional liquid crystal display device, one described in Patent Document 1 below is known. The backlight device described in Patent Document 1 includes a backlight housing having a light emitting surface, a diffusion plate, a prism sheet, and a reflective polarizing plate that are sequentially arranged to face the light emitting surface of the backlight housing. A laser light source disposed along one end surface of the backlight housing, an LED light source disposed along the other end surface of the backlight housing, a laser light from the laser light source and a backlight housing A laser light guide rod extended in a long shape so as to diffuse and emit laser light into the body, and a long shape so as to propagate LED light from the LED light source and diffuse and emit LED light into the backlight housing A stretched LED light guide bar.

JP 2014-26132 A

(Problems to be solved by the invention)
In the liquid crystal display device described in Patent Document 1 described above, the laser light guide bar and the LED light guide bar are individually installed for each laser light source and LED light source, and thus the number of components is large.

The present invention has been completed based on the above situation, and aims to reduce the number of parts.

(Means for solving the problem)
In the illumination device of the present invention, as a first aspect thereof, a laser light source that emits laser light, and a portion of the outer peripheral end face that directly faces the laser light source is a light incident portion on which the laser light is incident, and the outer peripheral end face A light guide plate in which a portion located on the opposite side of the light incident portion is a light incident opposite portion, and one of the pair of plate surfaces is a light exit plate surface that emits light, and the front of the light guide plate A diffuse reflection member that is attached in contact with the opposite portion of the writing light and diffusely reflects the laser light.

According to such a configuration, the laser light emitted from the laser light source enters the light incident portion of the light guide plate and travels straight in the light guide plate toward the light incident opposite portion. After the laser light that has reached the opposite light incident part is diffusely reflected by the diffuse reflection member attached so as to be in contact with the opposite light incident part, after traveling toward the light incident part side while diffusing in the light guide plate The light is emitted from the light exit plate surface. Thereby, the luminance uniformity of the emitted light is made high in the plane of the light emitting plate surface. In addition, as compared with the conventional configuration using a bar-shaped light guide for each laser light source, the light guide plate is used, which is preferable in reducing the number of components. In addition, since the diffuse reflection member is attached in contact with the light incident opposite portion of the light guide plate, it is difficult for light to leak from between the light incident opposite portion and the diffuse reflection member. Thereby, the utilization efficiency of light becomes excellent.

About the illuminating device of the said 1st aspect, the following structure is preferable as the embodiment.
(1) The laser light source includes a red laser light source that emits red laser light, a green laser light source that emits green laser light, and a blue laser light source that emits blue laser light. The laser light source and the blue laser light source are arranged in a row, and the diffuse reflection member is arranged over the entire end face having the light incident opposite portion of the outer peripheral end face of the light guide plate. In this way, when the laser beams of the respective colors emitted from the red laser light source, the green laser light source, and the blue laser light source arranged in a row form enter the light incident portion of the light guide plate, The light travels straight toward the light incident opposite portion, and is diffusely reflected by the diffuse reflection member arranged in contact with the light incident opposite portion. Then, the light of each color is mixed well within the light guide plate and emitted from the light output plate surface as white light. Since the diffuse reflection member is disposed over the entire area of the end face having the light incident opposite portion of the outer peripheral end face of the light guide plate, it is possible to diffusely reflect the laser light of each color regardless of the positional relationship with respect to the laser light source of each color. . Thereby, the certainty that the laser light of each color is diffusely reflected by the diffuse reflection member is high.

(2) An LED light source and an LED light source substrate on which the LED light source is mounted and opposed to the light incident opposite portion are provided, and the light guide plate is a portion facing at least the LED light source in the outer peripheral end surface However, it is set as the LED incident part into which the light of the said LED light source injects, and the said diffuse reflection member is distribute | arranged in the form adjacent to the said LED incident part. If it does in this way, the light emitted from the LED light source will inject into the LED light-incidence part of a light-guide plate, and will be radiate | emitted from the light-emitting plate surface after propagating through the inside of a light-guide plate. The diffuse reflection member is arranged adjacent to the LED light incident part, so that the light incident from the LED light source to the LED light incident part is not obstructed, and from the light incident part side to the light incident opposite part in the light guide plate. It is possible to diffusely reflect the laser beam traveling toward the surface well.

(3) The laser light source includes a red laser light source that emits red laser light and a blue laser light source that emits blue laser light, whereas the LED light source includes a green LED light source that emits green light. include. In this case, the diffuse reflection member is a pseudo red diffused light source and blue diffused light source that emits diffused light by diffusely reflecting the red laser light and blue laser light emitted from the red laser light source and the blue laser light source. Therefore, the red light and the blue light diffusely reflected by the diffusive reflecting member are well mixed in the light guide plate together with the green light emitted from the green LED light source and incident on the LED light incident portion, so as white light. The light is emitted from the light exit plate surface. The red laser light emitted from the red laser light source and the blue laser light emitted from the blue laser light source hardly interfere with each other in the wavelength range, and the wavelength range also for the green light emitted from the green LED light source. It is assumed that there is almost no interference. Thereby, the color purity of each color becomes sufficiently high. Moreover, since the green LED light source has better luminous efficiency than the green laser light source that emits green laser light, high luminance can be obtained with low power consumption.

(4) The red laser light source and the blue laser light source are arranged adjacent to each other, and the diffuse reflection member has a formation range straddling the red laser light source and the blue laser light source. In this way, the red laser light and the blue laser light can be efficiently scattered and reflected by the diffuse reflection member having a formation range extending between the red laser light source and the blue laser light source adjacent to each other.

(5) The light distribution range of the laser light incident on the light incident portion is expanded at least at the light incident portion on the outer peripheral end face of the light guide plate as it goes from the light incident portion side toward the light incident opposite portion. A light refracting portion for providing a refractive action to the laser light is provided. In this way, the laser light emitted from the laser light source is given a refracting action by the light refracting unit when entering the light incident unit. The light distribution range of the laser light to which the refracting action is imparted is expanded in the process of traveling from the light incident part side toward the light incident opposite part in the light guide plate. Therefore, the laser light that has reached the opposite part of the incident light is diffusely reflected while being applied to the diffuse reflection member in a wider range, so that the diffusion range of the diffuse reflection light by the diffuse reflection member becomes wider. Thereby, the luminance uniformity of the emitted light is made higher in the plane of the light emitting plate surface.

In the illumination device of the present invention, as a second aspect thereof, a laser light source that emits laser light, and a portion of the outer peripheral end face that faces the laser light source is a light incident portion on which the laser light is incident, and the outer peripheral end face A light guide plate in which a portion located on the opposite side of the light incident portion is a light incident opposite portion, and one of the pair of plate surfaces is a light exit plate surface that emits light, and the front of the light guide plate A diffusive reflecting member that is arranged in a shape facing the opposite side of the writing light and is physically separated from the light guide plate and diffusely reflects the laser light.

According to such a configuration, the laser light emitted from the laser light source enters the light incident portion of the light guide plate and travels straight in the light guide plate toward the light incident opposite portion. The laser light that has reached the opposite light incident part is diffusely reflected by the diffuse reflection member arranged in a form facing the opposite light incident part, and is diffused in the light guide plate toward the light incident part side. After traveling, the light is emitted from the light-emitting plate surface. Thereby, the luminance uniformity of the emitted light is made high in the plane of the light emitting plate surface. In addition, as compared with a conventional configuration in which a light guide bar is used for each light source, a light guide plate is used, which is preferable in reducing the number of parts.

Since the diffuse reflection member is physically separated from the light guide plate, the positional relationship with respect to the laser light source is determined regardless of the positional relationship of the light guide plate with respect to the laser light source. Accordingly, even if the light guide plate is displaced with respect to the laser light source, the positional relationship of the diffuse reflection member with respect to the laser light source is stably maintained, and thus the certainty that the laser light is diffusely reflected by the diffuse reflection member. Is considered high.

About the illuminating device of the said 2nd aspect, the following structure is preferable as the embodiment.
(1) An LED light source and an LED light source substrate on which the LED light source is mounted and opposed to the light incident opposite portion are provided, and the light guide plate is a portion facing at least the LED light source on the outer peripheral end surface However, it is set as the LED incident part into which the light of the said LED light source injects, and the said diffuse reflection member is provided in the said LED light source board | substrate. If it does in this way, the light emitted from the LED light source will inject into the LED light-incidence part of a light-guide plate, and will be radiate | emitted from the light-emitting plate surface after propagating through the inside of a light-guide plate. Using the LED light source substrate on which the LED light source is mounted, the diffusive reflection member can be arranged in a form facing the light incident opposite portion of the light guide plate.

(2) A laser light source substrate on which the laser light source is mounted and facing the light incident part, and a housing for mounting the laser light source substrate and the LED light source substrate and accommodating the light guide plate. In this way, the laser light source substrate and the LED light source substrate provided with the diffuse reflection member are attached to a common housing, so that the positional accuracy related to the positional relationship between the laser light source and the diffuse reflection member is kept high. Preferred above.

(3) The LED light source substrate is disposed on the lower side in the vertical direction with respect to the light guide plate, and the diffuse reflection member is disposed in contact with the light incident opposite portion of the light guide plate. . If it does in this way, the light incident opposite part and a diffuse reflection member can be maintained in contact | adherence state using the gravity which acts on a light-guide plate. Thereby, it is difficult for light leakage to occur between the light incident opposite portion and the diffuse reflection member, and the light utilization efficiency is excellent.

(4) The laser light source includes a red laser light source that emits red laser light and a blue laser light source that emits blue laser light, whereas the LED light source includes a green LED light source that emits green light. include. In this case, the diffuse reflection member is a pseudo red diffused light source and blue diffused light source that emits diffused light by diffusely reflecting the red laser light and blue laser light emitted from the red laser light source and the blue laser light source. Therefore, the red light and the blue light diffusely reflected by the diffusive reflecting member are well mixed in the light guide plate together with the green light emitted from the green LED light source and incident on the LED light incident portion, so as white light. The light is emitted from the light exit plate surface. The red laser light emitted from the red laser light source and the blue laser light emitted from the blue laser light source hardly interfere with each other in the wavelength range, and the wavelength range also for the green light emitted from the green LED light source. It is assumed that there is almost no interference. Thereby, the color purity of each color becomes sufficiently high. Moreover, since the green LED light source has better luminous efficiency than the green laser light source that emits green laser light, high luminance can be obtained with low power consumption.

(5) The red laser light source and the blue laser light source are arranged adjacent to each other, and the diffuse reflection member has a formation range straddling the red laser light source and the blue laser light source. In this way, the red laser light and the blue laser light can be efficiently scattered and reflected by the diffuse reflection member having a formation range extending between the red laser light source and the blue laser light source adjacent to each other.

(6) A light guide plate support member that supports the light guide plate from the side opposite to the light output plate surface side is provided, and the diffuse reflection member is provided on the light guide plate support member. In this way, the light guide plate is supported from the side opposite to the light output plate surface side by the light guide plate support member, so that the positional relationship between the laser light source and the light incident portion is stably maintained. Using this light guide plate support member, the diffuse reflection member can be arranged in a form facing the light incident opposite portion of the light guide plate.

(7) The light distribution range of the laser light incident on the light incident portion is expanded at least at the light incident portion on the outer peripheral end surface of the light guide plate as it goes from the light incident portion side toward the light incident opposite portion. A light refracting portion for providing a refractive action to the laser light is provided. In this way, the laser light emitted from the laser light source is given a refracting action by the light refracting unit when entering the light incident unit. The light distribution range of the laser light to which the refracting action is imparted is expanded in the process of traveling from the light incident part side toward the light incident opposite part in the light guide plate. Therefore, the laser light that has reached the opposite part of the incident light is diffusely reflected while being applied to the diffuse reflection member in a wider range, so that the diffusion range of the diffuse reflection light by the diffuse reflection member becomes wider. Thereby, the luminance uniformity of the emitted light is made higher in the plane of the light emitting plate surface.

In order to solve the above problems, a display device of the present invention includes the above-described illumination device and a display panel that displays an image using light emitted from the illumination device. According to the display device having such a configuration, the number of parts of the lighting device is reduced, and light use efficiency is excellent in the lighting device, so that the manufacturing cost can be reduced and the power consumption can be reduced. This is suitable for increasing the brightness.

In order to solve the above problems, a television receiver of the present invention includes the display device described above. According to such a television receiver, since the manufacturing cost of the display device is reduced and the display quality is excellent, it is excellent in price competitiveness and the display of the television image with excellent display quality. Can be realized.

(The invention's effect)
According to the present invention, the number of parts can be reduced.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Plan view of a backlight device constituting a liquid crystal display device AA line sectional view of FIG. The top view of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 2 of this invention. AA line sectional view of FIG. BB sectional view of FIG. A graph showing the emission spectrum of each light source and the transmission spectrum of each colored portion of the color filter The top view of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 3 of this invention. The top view of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 4 of this invention. The top view of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 5 of this invention. AA line sectional view of FIG. BB sectional view of FIG. The top view of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 6 of this invention. AA line sectional view of FIG. The top view of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 7 of this invention. The top view of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 8 of this invention. The top view of the backlight apparatus which comprises the liquid crystal display device which concerns on Embodiment 9 of this invention. AA line sectional view of FIG.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a liquid crystal display device 10 and a television receiver 10TV using the same are illustrated. 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. Also, the upper side shown in FIG. 3 is the front side, and the lower side is the back side.

As shown in FIG. 1, a television receiver 10TV according to the present embodiment includes a liquid crystal display device 10 having a substantially horizontally long overall shape, and both front and back cabinets 10Ca and 10Cb that are accommodated so as to sandwich the liquid crystal display device 10. , A power source 10P, a tuner (reception unit) 10T that receives a television signal, and a stand 10S. As shown in FIG. 3, the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11 that displays an image, and a backlight device (illumination device) 12 that supplies light for display to the liquid crystal panel 11. These are integrally held by a frame-like bezel 13 or the like.

As shown in FIG. 3, the liquid crystal panel 11 is a liquid crystal molecule that is a substance in which a pair of glass substrates are bonded together with a predetermined gap therebetween, and optical properties change between the glass substrates with the application of an electric field. The liquid crystal layer (not shown) containing is enclosed. One glass substrate (array substrate, active matrix substrate) has an inner surface surrounded by switching elements (for example, TFTs) connected to the source wiring and gate wiring orthogonal to each other, and the source wiring and gate wiring. In addition to the pixel electrodes arranged in the shape region and connected to the switching element in a matrix, an alignment film or the like is provided. On the inner surface side of the other glass substrate (counter substrate, CF substrate), there is a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in a matrix in a predetermined arrangement. In addition to being provided, a light-shielding layer (black matrix) arranged in a lattice shape and disposed between the colored portions, a solid counter electrode facing the pixel electrode, an alignment film, and the like are provided. In addition, the polarizing plate is distribute | arranged to the outer surface side of both glass substrates, respectively. Further, the long side direction in the liquid crystal panel 11 coincides with the X-axis direction, the short side direction coincides with the Y-axis direction, and the thickness direction coincides with the Z-axis direction.

As shown in FIGS. 2 and 3, the backlight device 12 includes a substantially box-shaped chassis (housing) 14 having a light emitting portion 14b that opens toward the front side (the liquid crystal panel 11 side), and the chassis 14. The optical member (optical sheet) 15 arranged so as to cover the light emitting portion (opening portion) 14b and the frame 16 that supports the optical member 15 from the back side are provided. Further, in the chassis 14, a red laser light source (laser light source) 17, a blue laser light source (laser light source) 18, and a green laser light source (laser light source) 19 that are light sources, a red laser light source 17, a blue laser light source 18 and green are provided. A laser light source substrate 20 on which a laser light source 19 is mounted, a light guide plate 22 that guides light from each of the laser light sources 17 to 19 and guides it to the optical member 15 (liquid crystal panel 11), and is laminated on the back side of the light guide plate 22 The reflection sheet 23 to be disposed, and the light guide plate support member 24 interposed between the reflection sheet 23 and the chassis 14 to support the light guide plate 22 from the back side are provided. In FIG. 2, for the purpose of distinction, the red laser light source 17 is provided with a vertical stripe pattern, the blue laser light source 18 is provided with a horizontal stripe pattern, and the green laser light source 19 is provided with an oblique stripe pattern. The backlight device 12 is provided with a laser light source substrate 20 at one end in the short side direction (Y-axis direction), and light from each of the laser light sources 17 to 19 is directed to the light guide plate 22. Thus, an edge light type (side light type) of a one side incident type in which light enters from one side is used. Next, each component of the backlight device 12 will be described in detail.

The chassis 14 is made of metal, and as shown in FIG. 2 and FIG. 3, a bottom 14 a that is substantially horizontally long like the liquid crystal panel 11, and a side 14 c that rises from the outer end of each side of the bottom 14 a. As a whole, it has a shallow, generally box shape that opens toward the front side. The long side direction of the chassis 14 (bottom part 14a) coincides with the X-axis direction (horizontal direction), and the short side direction thereof coincides with the Y-axis direction (vertical direction). Further, the frame 16 and the bezel 13 can be fixed to the side portion 14c.

As shown in FIG. 3, the optical member 15 covers the light emitting portion 14 b of the chassis 14 and is disposed between the liquid crystal panel 11 and the light guide plate 22. That is, it can be said that the optical member 15 is arranged on the exit side of the light emission path with respect to the laser light sources 17 to 19. The optical member 15 has a sheet shape, and a total of three optical members 15 are provided. Specifically, the optical member 15 includes a microlens sheet 15a that imparts an isotropic condensing function to light, a prism sheet 15b that imparts an anisotropic condensing function to light, and a reflective type that reflects and reflects light. And a polarizing sheet 15c. The optical member 15 is laminated from the back side in the order of the microlens sheet 15 a, the prism sheet 15 b, and the reflective polarizing sheet 15 c, and their outer edge portions are placed on the front side of the frame 16. In other words, the optical member 15 is opposed to the light guide plate 22 on the front side, that is, on the light emitting side, with an interval corresponding to the frame 16 (a frame-like portion 16a described later in detail).

As shown in FIG. 3, the frame 16 has a horizontally long frame-shaped portion 16 a extending along the outer peripheral edge portion of the light guide plate 22 and the optical member 15. The frame-shaped portion 16a receives and supports the outer peripheral edge of the optical member 15 from the back side over substantially the entire circumference, and supports the outer peripheral edge of the light guide plate 22 from the front side over the entire circumference. A frame-side reflection sheet 25 that reflects light is attached to a surface facing the back surface (the light guide plate 22 and each of the laser light sources 17 to 19) of one long side of the frame-shaped portion 16a. The frame 16 has a liquid crystal panel support portion 16b that protrudes from the frame-shaped portion 16a toward the front side and supports the outer peripheral edge portion of the liquid crystal panel 11 from the back side.

As shown in FIGS. 2 and 3, the red laser light source 17 has a red semiconductor laser element that emits red laser light. The blue laser light source 18 includes a blue semiconductor laser element that emits blue laser light. The green laser light source 19 includes a green semiconductor laser element that emits green laser light. The laser beams of the respective colors emitted from the red laser light source 17, the blue laser light source 18, and the green laser light source 19 are coherent lights having the same phase and wavelength, and have a divergence angle as compared to light emitted from a general LED light source. Is small, has a high straightness, and has excellent color purity. The red laser light source 17, the blue laser light source 18, and the green laser light source 19 are each mounted on a laser light source substrate 20 described below on the opposite side of the light emitting surface of the red laser light source 17, and are of a so-called top surface emission type. The

As shown in FIGS. 2 and 3, the laser light source substrate 20 has a plate shape extending along the long side direction of the chassis 14, and one side of the long side (the lower side shown in FIG. 2). It is attached to the part 14c. The laser light source substrate 20 is preferably attached to the lower side portion 14c in the vertical direction of the chassis 14, thereby causing the liquid crystal display device 10 and the television receiver 10TV to originate from the laser light source substrate 20. Even if the frame width increases only by one side, the design is unlikely to be impaired. In the laser light source substrate 20, a mounting surface 20 a on which the red laser light source 17, the blue laser light source 18, and the green laser light source 19 are mounted is opposed to one end surface on the long side of the light guide plate 22. A wiring pattern (not shown) for supplying power to the red laser light source 17, the blue laser light source 18, and the green laser light source 19 is patterned on the mounting surface 20a of the laser light source substrate 20, and a plurality of red lasers are provided. The light source 17, the blue laser light source 18, and the green laser light source 19 are mounted in a form repeatedly arranged at intervals along the X-axis direction.

The light guide plate 22 is made of a substantially transparent synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate). As shown in FIGS. 2 and 3, the light guide plate 22 has a plate shape that is thicker than the optical member 15 and is housed in the chassis 14 so as to be positioned directly below the liquid crystal panel 11 and the optical member 15. . The light guide plate 22 has a horizontally long substantially square shape when viewed in a plane, like the optical member 15 and the like. Of the outer peripheral end faces of the light guide plate 22, one end face on the long side (the lower side shown in FIG. 2) faces the light emitting faces of the red laser light source 17, the blue laser light source 18, and the green laser light source 19. It has a laser incident part (light incident part) 22a into which laser light is incident, and the number and arrangement interval thereof are the number and arrangement interval of the red laser light source 17, the blue laser light source 18, and the green laser light source 19. Are the same. The other end surface (the upper side shown in FIG. 2) on the long side of the outer peripheral end surfaces of the light guide plate 22 is a portion positioned on the side opposite to the laser incident portion 22a. 22e. A plurality of laser incident light opposite portions 22e are arranged on the other end face of the light guide plate 22 so as to be arranged at intervals along the X-axis direction. The number and arrangement intervals of the red light source 17 and the blue laser are the same. The number of the light sources 18 and the green laser light source 19 (laser light incident part 22a) is the same as the number and arrangement interval. Of the pair of front and back plate surfaces, the light guide plate 22 has a light-emitting plate surface 22c that emits light toward the liquid crystal panel 11 and the optical member 15 and a plate surface facing the back side. The light output opposite plate surface 22d is opposite to the light plate surface 22c. As described above, the light guide plate 22 introduces the light emitted from the laser light sources 17 to 19 along the Y-axis direction from the respective light incident portions 22a, and after propagating the light internally, extends along the Z-axis direction. And has a function of emitting light from the light exit plate surface 22c toward the optical member 15 side (front side, light emission side).

As shown in FIG. 3, the reflection sheet 23 is disposed so as to cover the light output opposite plate surface 22 d of the light guide plate 22. The reflection sheet 23 is excellent in light reflectivity, and can efficiently start up light leaking from the light output opposite plate surface 22d of the light guide plate 22 toward the front side (light output plate surface 22c). The reflection sheet 23 has an outer shape that is slightly larger than the light guide plate 22, and is arranged in such a manner that both end portions on the long side protrude from the laser light input portions 22 a of the light guide plate 22 toward the laser light sources 17 to 19. Has been.

The light guide plate support member 24 is made of synthetic resin, and as shown in FIG. 3, a pair of light guide plate support members 24 are provided so as to support both ends on the long side of the light guide plate 22 from the back side. The light guide plate support member 24 is disposed so as to be interposed between the bottom portion 14a of the chassis 14 and the reflection sheet 23, and the light guide plate 22 is lifted from the bottom portion 14a so as not to be in direct contact with the bottom portion 14a. I support it. As a result, the positional relationship in the Z-axis direction between the laser light sources 17 to 19 and the light guide plate 22 can be stably maintained, and in addition, the heat generated by the light emission from the laser light sources 17 to 19 can be maintained. Is transmitted to the light guide plate 22 from the chassis 14 even if transmitted to the chassis 14 via the laser light source substrate 20. The light guide plate support member 24 extends along the long side direction of the light guide plate 22 and the reflection sheet 23 and directly contacts the reflection sheet 23, and from the both ends of the main body portion 24a in the Y-axis direction to the back side. And a pair of leg portions 24b that project toward the bottom portion 14a of the chassis 14.

Now, the backlight device 12 according to this embodiment has a diffuse reflection member 26 for diffusing and reflecting the laser beams of each color propagating through the light guide plate 22 as shown in FIGS. The diffuse reflection member 26 is made of a synthetic resin (for example, made of PCT resin) having a white surface with excellent light reflectivity, and the other of the outer peripheral end surfaces of the light guide plate 22 on the long side (see FIG. 2). It is attached so as to face and be in contact with at least the laser incident light opposite portion 22e on the upper end surface shown. The diffuse reflection member 26 is attached to the other end surface (including the laser incident light opposite portion 22e) of the light guide plate 22 by using a substantially transparent adhesive, double-sided tape, or the like.

According to such a configuration, the red laser light, the blue laser light, and the green laser light emitted from the red laser light source 17, the blue laser light source 18, and the green laser light source 19 are incident on the laser incident portion 22 a of the light guide plate 22. Then, it goes straight in the light guide plate 22 and reaches the laser incident light opposite portion 22e located on the opposite side to the laser incident portion 22a. The red laser light, the blue laser light, and the green laser light that have reached the laser incident light opposite portion 22e are diffusely reflected by the diffusive reflecting member 26, and are diffused in the light guide plate 22 toward the laser incident portion 22a. Then, the light is emitted from the light exit plate surface 22c. Thus, the diffuse reflection member 26 disposed on the opposite side of the red laser light source 17, the blue laser light source 18, and the green laser light source 19 in the Y-axis direction has a divergence angle equal to or greater than that of a general LED light source. It functions as a pseudo red diffused light source that emits diffused red, blue, and green light, a blue diffused light source, and a green diffused light source. Thereby, the red light, the blue light and the green light diffusely reflected by the diffuse reflection member 26 are well mixed in the light guide plate 22 and emitted from the light output plate surface 22c as white light having no color unevenness. Both uniformity and chromaticity uniformity are high. In particular, since the diffuse reflection member 26 is attached in contact with the laser incident light opposite portion 22e of the light guide plate 22, light hardly leaks between the laser incident light opposite portion 22e and the diffuse reflection member 26. Yes. Thereby, the utilization efficiency of light becomes excellent. Further, as compared with a conventional configuration in which a light guide bar is individually used for each light source, the light guide plate 22 is used, which is preferable in reducing the number of components. The white balance relating to the image displayed on the liquid crystal panel 11 can be controlled by adjusting the outputs of the red laser light source 17, the blue laser light source 18 and the green laser light source 19. , B does not need to be adjusted for each pixel.

Moreover, as shown in FIG. 2, the diffuse reflection member 26 is arranged over the entire length and the entire area of the other end face having the laser incident opposite portion 22 e among the outer peripheral end faces of the light guide plate 22. In other words, in addition to the plurality of laser incident light opposite portions 22e that are intermittently arranged in the X-axis direction on the other end face of the light guide plate 22, the diffuse reflection member 26 is also positive with the portion adjacent to the laser incident light opposite portion 22e. It is attached so as to face and touch. In this way, the laser light of each color can be diffusely reflected regardless of the positional relationship in the X-axis direction of the diffuse reflection member 26 with respect to the laser light sources 17 to 19 of each color of red, blue, and green. The certainty that the laser light is diffusely reflected by the diffuse reflection member 26 is high. Further, when assembling, it is not necessary to align the diffuse reflection member 26 with respect to the laser light sources 17 to 19 of the respective colors in the X-axis direction, so that the manufacture becomes easy.

As described above, the backlight device (illumination device) 12 of this embodiment is a laser light source among the red laser light source 17, the blue laser light source 18, and the green laser light source 19 that are laser light sources that emit laser light, and the outer peripheral end surface. A portion facing a certain red laser light source 17, blue laser light source 18, and green laser light source 19 is a laser incident portion (light incident portion) 22a on which laser light is incident, and a laser incident portion 22a on the outer peripheral end surface. The light guide plate 22 has a portion positioned on the opposite side as a laser incident light opposite portion (light incident opposite portion) 22e, and one of the pair of plate surfaces serves as a light output plate surface 22c for emitting light, and a light guide plate And a diffuse reflection member 26 that is attached in contact with the laser incident light opposite portion 22e of 22 and diffusely reflects the laser light.

According to such a configuration, the laser light emitted from the red laser light source 17, the blue laser light source 18, and the green laser light source 19, which are laser light sources, enters the laser incident portion 22 a of the light guide plate 22, and the light guide plate 22. It goes to the laser incident light opposite portion 22e in a form that goes straight inside. The laser light reaching the laser incident light opposite portion 22e is diffusely reflected by the diffuse reflection member 26 attached in contact with the laser incident light opposite portion 22e, so that the laser incident portion is diffused while being diffused in the light guide plate 22. After traveling toward the 22a side, the light is emitted from the light exit plate surface 22c. As a result, the luminance uniformity of the emitted light is high within the surface of the light output plate surface 22c. Further, compared to the conventional configuration in which a rod-shaped light guide unit is used for each of the red laser light source 17, the blue laser light source 18, and the green laser light source 19, which are laser light sources, the light guide plate 22 is used. This is suitable for reduction. In addition, since the diffuse reflection member 26 is attached in contact with the laser incident light opposite portion 22e of the light guide plate 22, light hardly leaks from between the laser incident light opposite portion 22e and the diffuse reflection member 26. It has become. Thereby, the utilization efficiency of light becomes excellent.

The laser light sources include a red laser light source 17 that emits red laser light, a green laser light source 19 that emits green laser light, and a blue laser light source 18 that emits blue laser light. The laser light source 19 and the blue laser light source 18 are arranged in a line, and the diffuse reflection member 26 is arranged over the entire end surface of the light guide plate 22 having the laser incident light opposite portion 22e. In this way, the laser light of each color emitted from the red laser light source 17, the green laser light source 19, and the blue laser light source 18 arranged in a row is incident on the laser incident part 22 a of the light guide plate 22. Then, the light guide plate 22 goes straight toward the laser incident light opposite portion 22e, and is diffusely reflected by the diffuse reflection member 26 arranged in contact with the laser incident light opposite portion 22e. Then, the light of each color is well mixed in the light guide plate 22 and emitted from the light output plate surface 22c as white light. Since the diffuse reflection member 26 is arranged over the entire end face having the laser incident light opposite portion 22e in the outer peripheral end face of the light guide plate 22, the laser light of each color regardless of the positional relationship with respect to the laser light sources 17 to 19 of each color. Can be diffusely reflected. Thereby, the certainty that the laser light of each color is diffusely reflected by the diffuse reflection member 26 is high.

The liquid crystal display device (display device) 10 according to the present embodiment includes the backlight device 12 described above and a liquid crystal panel (display panel) 11 that displays an image using light emitted from the backlight device 12. And comprising. According to the liquid crystal display device 10 having such a configuration, the number of parts of the backlight device 12 is reduced, and the use efficiency of light in the backlight device 12 is excellent, so that the manufacturing cost can be reduced. This is suitable for reducing power consumption and increasing brightness.

Further, the television receiver 10TV according to the present embodiment includes the liquid crystal display device 10 described above. According to such a television receiver 10TV, the manufacturing cost of the liquid crystal display device 10 is reduced and the display quality is excellent. Therefore, the television image is excellent in price competitiveness and excellent in display quality. Can be realized.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a green LED light source 27 is used instead of the green laser light source 19 from the first embodiment described above. In addition, the overlapping description about the same structure, operation | movement, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

In the backlight device 112 according to the present embodiment, as shown in FIG. 4, a red laser light source 117 and a blue laser light source 118 are used as a light source, and a green LED light source 27 is used. In FIG. 4, the green LED light source 27 is given an oblique stripe pattern for distinction. The green LED light source 27 is mounted on an LED light source substrate 28 different from the laser light source substrate 120 on which the red laser light source 117 and the blue laser light source 118 are mounted. The LED light source substrate 28 on which the green LED light source 27 is mounted is arranged so as to sandwich the light guide plate 122 in the Y-axis direction with the laser light source substrate 120. Therefore, the backlight device 112 is provided with the LED light source substrate 28 at one end in the short side direction and the laser light source substrate 120 at the other end, and the

light sources

27, 117, 118 are arranged. Is a double-side incident type edge light type (side light type) in which light from the light enters the light guide plate 122 from both sides.

As shown in FIGS. 4 and 5, the laser light source substrate 120 is attached to the other side 114c on the other long side of the chassis 114 (upper side shown in FIG. 4). A plurality of red laser light sources 117 and a plurality of blue laser light sources 118 are mounted on the mounting surface 120a of the laser light source substrate 120 so as to be alternately arranged at intervals along the X-axis direction. Specifically, in the plurality of red laser light sources 117 and blue laser light sources 118, there are two intervals between adjacent ones, and those arranged at relatively small intervals constitute one set. . Accordingly, the distance between the red laser light source 117 and the blue laser light source 118 that form different sets is relatively wide.

The green LED light source 27 has a green semiconductor element (green LED element) that emits green light, as shown in FIGS. Green light emitted from the green LED light source 27 is incoherent light, and has a larger divergence angle and weaker straightness than the laser beams of the respective colors emitted from the red laser light source 117 and the blue laser light source 118. The green LED light source 27 has a luminous efficiency that is approximately twice as high as that of a general green laser light source, and high luminance can be obtained with low power consumption. In addition, the green LED light source 27 is mounted on an LED light source substrate 28, which will be described below, on the side opposite to the light emitting surface of the green LED light source 27, and is a so-called top surface emitting type.

4 and 6, the LED light source substrate 28 has a plate shape extending along the long side direction of the chassis 114, and one side of the long side (the lower side shown in FIG. 4). It is attached to the portion 114c. In the LED light source substrate 28, the mounting surface 28 a on which the green LED light source 27 is mounted is opposed to one end surface on the long side of the light guide plate 122. A wiring pattern (not shown) for supplying power to the green LED light source 27 is patterned on the mounting surface 28a of the LED light source substrate 28, and a plurality of green LED light sources 27 are spaced along the X-axis direction. It is implemented in a line-up form. Specifically, in the plurality of green LED light sources 27, the interval between adjacent ones is made wider than the arrangement range in the X-axis direction in the red laser light source 117 and the blue laser light source 118 that form the same set. Then, the plurality of green LED light sources 27 are arranged (displaced) so as to be offset from the red laser light source 117 and the blue laser light source 118 in the X-axis direction.

As shown in FIG. 4, the light guide plate 122 has the other end face on the long side (upper side shown in FIG. 4) of its outer peripheral face faces the light emitting faces of the red laser light source 117 and the blue laser light source 118. The laser light incident portions 122a into which the laser beams of the respective colors are incident are provided, and the number of installations and the arrangement interval thereof are the same as the number of installation sets of the red laser light source 117 and the blue laser light source 118 and the arrangement interval between the sets. is there. In the laser incident part 122a, the formation range in the X-axis direction substantially coincides with the arrangement range of the red laser light source 117 and the blue laser light source 118 forming one set. The light guide plate 122 has an end surface on one of the long sides (the lower side shown in FIG. 4) facing the light emitting surface of the green LED light source 27 and facing green light. The light incident section 22b is provided, and the number of installation and the arrangement interval thereof are the same as the number of installation and the arrangement interval of the green LED light sources 27. The LED light incident portion 22b has a formation range in the X-axis direction that is further left and right than the portion facing the green LED light source 27 in the one end surface and the portion facing the green LED light source 27 (arrangement range of the green LED light source 27). It has become wide. This is because the divergence angle of the green light emitted from the green LED light source 27 is larger than the divergence angles of the

laser light sources

117 and 118. One end surface on the long side of the light guide plate 122 having the LED light incident portion 22b described above has a laser light incident opposite portion 122e which is a portion located on the opposite side to the laser light incident portion 122a. A plurality of laser incident light opposite portions 122e are arranged on the one end face of the light guide plate 122 so as to be alternately arranged along with the LED incident light portions 22b along the X-axis direction. 117 and the number of installed sets of the blue laser light sources 118 and the arrangement interval between the sets are the same.

Here, the main emission wavelength and emission spectrum in each of the

light sources

27, 117, and 118 provided in the backlight device 12 will be described in detail with reference to FIG. FIG. 7 shows emission spectra of the

light sources

27, 117, and 118. The horizontal axis of the figure is the wavelength (unit is “nm”), and the left vertical axis of the figure is the emission intensity ( The unit is “W / nm”). In FIG. 7, the emission spectrum of the red laser light source 117 is indicated by a thin broken line, the emission spectrum of the blue laser light source 118 is indicated by a thin two-dot chain line, and the emission spectrum of the green LED light source 27 is indicated by a thin one-dot chain line. The red laser light source 117 emits red laser light having an emission spectrum having a main emission wavelength of 630 nm and a half width (full width at half maximum) of 2 nm. The blue laser light source 118 emits blue laser light having an emission spectrum having a main emission wavelength of 441 nm and a half width of 2 nm. The blue laser light source 118 has a light emission intensity (0.055 W / nm) at the main light emission wavelength larger than the light emission intensity (0.037 W / nm) of the red laser light source 117. The green LED light source 27 emits green light having an emission spectrum having a main emission wavelength of about 534 nm and a half width of about 18 nm. The green LED light source 27 has a light emission intensity (0.0018 W / nm) at the main light emission wavelength that is much smaller than the same light emission intensity of each of the red laser light source 117 and the blue laser light source 118, and has a half-value width of the emission spectrum. It is much wider than the half width of each of the red laser light source 117 and the blue laser light source 118. As described above, the red laser light emitted from the red laser light source 117 and the blue laser light emitted from the blue laser light source 118 have little wavelength range interference with each other and are emitted from the green LED light source 27. The wavelength range hardly interferes with green light. Thereby, the color purity of each color related to the illumination light of the backlight device 112 becomes sufficiently high. Moreover, since the green LED light source 27 has better light emission efficiency than a general green laser light source that emits green laser light, high luminance can be obtained with low power consumption. Note that the emission spectra of the red laser light source 117 and the blue laser light source 118 described above are the same as those described in the first embodiment.

Next, the transmission spectrum in each colored portion of the color filter provided in the liquid crystal panel 111 will be described in detail with reference to FIG. FIG. 7 shows a transmission spectrum relating to each colored portion. The horizontal axis of FIG. 7 indicates the wavelength (unit: “nm”), and the vertical axis on the right side of FIG. 7 indicates the spectral transmittance (unit: “nm”). % "). In FIG. 7, the transmission spectrum of the red colored portion is indicated by a thick broken line, the transmission spectrum of the blue colored portion is indicated by a thick two-dot chain line, and the transmission spectrum of the green colored portion is indicated by a thick one-dot chain line. The red colored portion exhibiting red color selectively transmits light in the red wavelength region (about 600 nm to about 780 nm), that is, red light, and has a wavelength that is half the peak of the transmission spectrum. It is comprised so that it may become 595 nm or more. The “wavelength at half peak value” is a wavelength at half the spectral transmittance value (maximum value) at the peak wavelength (634 nm) of the transmission spectrum. The blue colored portion exhibiting a blue color selectively transmits light in the blue wavelength region (about 420 nm to about 500 nm), that is, blue light, and the peak wavelength included in the transmission spectrum is 468 nm. At the same time, the half width of the peak is about 90 nm. The green colored portion exhibiting a green color selectively transmits light in the green wavelength region (about 500 nm to about 570 nm), that is, green light, and the peak wavelength included in the transmission spectrum is set to 522 nm. At the same time, the half width of the peak is about 96 nm. The green colored portion partially overlaps the transmission spectrum with respect to both the red colored portion and the blue colored portion, but the amount of overlap with the blue colored portion is larger than the amount of overlap with the red colored portion. That is, the transmitted light of the green colored portion tends to include more blue light than red light. The transmission spectra of the colored portions of the color filter described above are the same as those described in the first embodiment.

As shown in FIG. 4, the diffuse reflection member 126 according to the present embodiment is adjacent to the LED light incident portion 22 b in the X-axis direction on one end surface (the lower side shown in FIG. 4) on the long side of the light guide plate 122. It is arranged in a form. Specifically, a plurality of diffuse reflection members 126 are arranged on the one end surface of the light guide plate 122 in an alternating manner along the LED light incident portion 22b along the X-axis direction. It is the same as the number and arrangement interval of the light opposite portions 122e (the number of installation groups of the red laser light source 117 and the blue laser light source 118 and the arrangement interval between the groups). According to such a configuration, the light advances from the laser light incident part 122a side toward the laser light incident opposite part 122e in the light guide plate 122 without interfering with the light incident on the LED light incident part 22b from the green LED light source 27. Each color laser beam can be diffusely reflected by the diffuse reflection member 126 well.

As shown in FIG. 4, the diffuse reflection member 126 and the laser incident light opposite portion 122e are arranged in the X-axis direction in the red laser light source 117 and the blue laser light source 118 in which the formation range in the X-axis direction forms one set. And are almost equal. In other words, the diffuse reflection member 126 has a formation range that straddles the red laser light source 117 and the blue laser light source 118 that form one set. According to such a configuration, if the diffuse reflection member 126 is individually associated with the red laser light source 117 and the blue laser light source 118 that form a pair, the diffuse reflection member 126 causes the red color. Laser light and blue laser light can be efficiently scattered and reflected, and the diffuse reflection member 126 can be easily installed.

As described above, according to the present embodiment, the green LED light source 27 that is the LED light source, and the LED light source substrate 28 that is mounted with the green LED light source 27 that is the LED light source and faces the laser incident light opposite portion 122e. In the light guide plate 122, at least a portion of the outer peripheral end face that faces the green LED light source 27 that is an LED light source is an LED light incident portion 22b into which light of the green LED light source 27 that is an LED light source is incident. The diffuse reflection member 126 is arranged adjacent to the LED light incident portion 22b. In this way, the light emitted from the green LED light source 27, which is an LED light source, enters the LED light incident portion 22b of the light guide plate 122, is propagated through the light guide plate 122, and then is emitted from the light exit plate surface 122c. The The diffuse reflection member 126 is arranged adjacent to the LED light incident part 22b, so that the light incident on the LED light incident part 22b from the green LED light source 27, which is an LED light source, is not disturbed in the light guide plate 122. Laser light traveling from the laser incident part 122a side toward the laser incident opposite part 122e can be diffusely reflected favorably.

The laser light source includes a red laser light source 117 that emits red laser light and a blue laser light source 118 that emits blue laser light, whereas the LED light source includes a green LED light source 27 that emits green light. include. In this way, the diffuse reflection member 126 diffuses and reflects the red laser light and the blue laser light emitted from the red laser light source 117 and the blue laser light source 118, thereby generating a pseudo red diffused light source that emits diffused light. Since it functions as a blue diffused light source, the red light and the blue light diffusely reflected by the diffuse reflection member 126 are good in the light guide plate 122 together with the green light emitted from the green LED light source 27 and incident on the LED incident portion 22b. Are emitted as white light from the light output plate surface 122c. The red laser light emitted from the red laser light source 117 and the blue laser light emitted from the blue laser light source 118 hardly interfere with each other in the wavelength range, and are compared with the green light emitted from the green LED light source 27. However, it is assumed that the wavelength range hardly interferes. Thereby, the color purity of each color becomes sufficiently high. Moreover, since the green LED light source 27 has better luminous efficiency than a green laser light source that emits green laser light, high luminance can be obtained with low power consumption.

Further, the red laser light source 117 and the blue laser light source 118 are arranged adjacent to each other, and the diffuse reflection member 126 has a formation range straddling the red laser light source 117 and the blue laser light source 118. In this way, the red laser light and the blue laser light can be efficiently scattered and reflected by the diffuse reflection member 126 having a formation range extending between the red laser light source 117 and the blue laser light source 118 adjacent to each other.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the configuration of the laser light incident part 222a and the LED light incident part 222b is changed from the above-described second embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 2 is abbreviate | omitted.

As shown in FIG. 8, the light guide plate 222 according to the present embodiment is provided with a light refracting portion 29 on each of the laser incident portion 222a and the LED incident portion 222b on the outer peripheral end face. The light refracting portion 29 is formed by subjecting the surfaces of the laser light incident portion 222a and the LED light incident portion 222b to unevenness so that the cross-sectional shape becomes a prism shape. The light refracting unit 29 has a refracting action that expands the divergence angle to each laser light incident from the

laser light sources

217 and 218 to the laser incident unit 222a and green light incident from the green LED light source 227 to the LED incident unit 222b. Is given. Each light to which the refractive action is imparted by the light refracting unit 29 travels in the light guide plate 222 in the Y-axis direction so as to be separated from the respective

light incident units

222a and 222b (for example, opposite to the laser incident light from the laser incident unit 222a side). Diverges in the X-axis direction in the process of proceeding toward the portion 222e), and the light distribution range is gradually expanded. Particularly, each laser beam is diffused and reflected while being irradiated to the diffuse reflection member 226 in a wider range when the light distribution range is expanded by the light refracting unit 29 and reaches the laser incident light opposite portion 222e. Thus, the diffusion range of the diffuse reflection light by the diffuse reflection member 226 becomes wider. Thereby, the luminance uniformity of the emitted light is made higher in the plane of the light output plate surface 222c of the light guide plate 222. In addition, on one end surface (the lower side shown in FIG. 8) of the long side of the light guide plate 222, the light refracting portion 29 is not disposed in the entire region of each LED light incident portion 222b, that is, each laser light incident opposite portion 222e. Since each of the diffuse reflection members 226 is attached to the light guide plate 222, each diffusion is applied to the non-formation portion of each light refracting portion 29 on the one end face. The reflection member 226 may be attached. That is, since each light refraction part 29 functions as a mark when attaching each diffuse reflection member 226, the assembly workability is good.

As described above, according to the present embodiment, at least the laser incident portion 222a on the outer peripheral end surface of the light guide plate 222 has a light distribution range of the laser light incident on the laser incident portion 222a from the laser incident portion 222a side. A light refracting portion 29 that imparts a refracting action to the laser light is provided so as to spread toward the laser incident light opposite portion 222e. In this way, the laser light emitted from the red laser light source 217 and the blue laser light source 218, which are laser light sources, is refracted by the light refracting unit 29 when entering the laser incident unit 222a. The light distribution range of the laser light imparted with the refraction action is expanded in the process of traveling through the light guide plate 222 from the laser light incident part 222a side toward the laser light incident opposite part 222e. Accordingly, the laser light reaching the laser incident light opposite portion 222e is diffusely reflected while being applied to the diffuse reflection member 226 in a wider range, so that the diffusion range of the diffuse reflection light by the diffuse reflection member 226 is wider. Become. As a result, the luminance uniformity of the emitted light is higher in the plane of the light exit plate surface 222c.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the arrangement of the red laser light source 317 and the blue laser light source 318 is changed from the second embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 2 is abbreviate | omitted.

As shown in FIG. 9, the red laser light source 317 and the blue laser light source 318 according to the present embodiment are arranged in such a manner that one set is close to each other. That is, the arrangement is such that there is almost no gap between the red laser light source 317 and the blue laser light source 318 forming one set in the X-axis direction. Therefore, the laser incident part 322a into which the light from the red laser light source 317 and the blue laser light source 318 forming one set is incident is continuous. Thereby, the arrangement range in the X-axis direction in the red laser light source 317 and the blue laser light source 318 is narrowed, and accordingly, the formation range of the diffuse reflection member 326 can be narrowed. In such a configuration, the red laser light and the blue laser light emitted from the red laser light source 317 and the blue laser light source 318 and diffusely reflected by the diffuse reflection member 326 in the light guide plate 322 are compared with the first embodiment described above. The green light from each other or the green LED light source 327 is hardly mixed. For this reason, in the light guide plate 322, the end portions on the green LED light source 327 and the diffuse reflection member 326 side are mixed color regions for mixing red laser light, blue laser light, and green light (from the one-dot chain line shown in FIG. 9). (Lower area) MA is set.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIGS. As in the first embodiment, in the fifth embodiment, a liquid crystal display device 410 used in a television receiver will be described. As shown in FIG. 11, the liquid crystal display device 410 displays a liquid crystal panel (display panel) that displays an image. ) 411 and a backlight device (illumination device) 412 that supplies light for display to the liquid crystal panel 411, and these are integrally held by a frame-like bezel 413 or the like. The liquid crystal panel 411 has the same configuration as that of the first embodiment.

On the other hand, as shown in FIGS. 10 and 11, the backlight device 412 includes a substantially box-shaped chassis (housing) 414 having a light emitting portion 414b that opens toward the front side (the liquid crystal panel 411 side); An optical member (optical sheet) 415 arranged to cover the light emitting portion (opening) 414b of the chassis 414, and a frame 416 that supports the optical member 415 from the back side. Further, a red laser light source (laser light source) 417, a blue laser light source (laser light source) 418, and a green LED light source (LED light source) 419, which are light sources, and a red laser light source 417 and a blue laser light source 418 are mounted in the chassis 414. A laser light source substrate 420, an LED light source substrate 421 on which a green LED light source 419 is mounted, and a light guide plate 422 that guides light from each of the light sources 417 to 419 to the optical member 415 (liquid crystal panel 411). A reflection sheet 423 that is stacked on the back side of the light guide plate 422, and a light guide plate support member 424 that is interposed between the reflection sheet 423 and the chassis 414 and supports the light guide plate 422 from the back side. In FIG. 10, the red laser light source 417 has a vertical stripe pattern, the blue laser light source 418 has a horizontal stripe pattern, and the green LED light source 419 has a diagonal stripe pattern for distinction. In the backlight device 412, a laser light source substrate 420 and an LED light source substrate 421 are disposed at both ends in the short side direction (Y-axis direction), and light from each of the light sources 417 to 419 is transmitted through the light guide plate. Both sides light incident type edge light type (side light type) that is incident on both sides of 422 is used. Next, each component of the backlight device 412 will be described in detail.

As shown in FIGS. 10 and 11, the red laser light source 417 has a red semiconductor laser element that emits red laser light. The blue laser light source 418 includes a blue semiconductor laser element that emits blue laser light. The laser light of each color emitted from the red laser light source 417 and the blue laser light source 418 is coherent light having the same phase and wavelength, and has a smaller divergence angle than green light emitted from a green LED light source 419 described later. Strong straightness. The color laser light emitted from the red laser light source 417 and the blue laser light source 418 is superior in color purity as compared to the light of each color emitted from a general red LED light source or blue LED light source. Further, the red laser light source 417 and the blue laser light source 418 are each mounted on a laser light source substrate 420 described below on the side opposite to the light emitting surface of the red laser light source 417 and are of a so-called top surface emission type.

As shown in FIGS. 10 and 11, the laser light source substrate 420 has a plate shape extending along the long side direction of the chassis 414, and one side of the long side (the upper side shown in FIG. 10). It is attached to 414c. In the laser light source substrate 420, a mounting surface 420 a on which the red laser light source 417 and the blue laser light source 418 are mounted is opposed to one end surface on the long side of the light guide plate 422. A wiring pattern (not shown) for supplying power to the red laser light source 417 and the blue laser light source 418 is patterned on the mounting surface 420a of the laser light source substrate 420, and a plurality of red laser light sources 417 and blue lasers are provided. The light sources 418 are mounted so as to be arranged alternately at intervals along the X-axis direction. Specifically, in the plurality of red laser light sources 417 and blue laser light sources 418, there are two intervals between adjacent ones, and those arranged at relatively narrow intervals constitute one set. . Therefore, the distance between the red laser light source 417 and the blue laser light source 418 that form different sets is relatively wide.

The green LED light source 419 includes a green semiconductor element (green LED element) that emits green light, as shown in FIGS. 10 and 12. Green light emitted from the green LED light source 419 is incoherent light, and has a larger divergence angle and weaker straightness than the laser light of each color emitted from the red laser light source 417 and the blue laser light source 418 described above. The green LED light source 419 has a luminous efficiency that is approximately twice as high as that of a general green laser light source, and high luminance can be obtained with low power consumption. Further, the green LED light source 419 is mounted on the LED light source substrate 421 described below on the surface opposite to the light emitting surface of the green LED light source 419, and is a so-called top surface light emitting type.

As shown in FIGS. 10 and 12, the LED light source substrate 421 has a plate shape extending along the long side direction of the chassis 414, and the other long side (the lower side shown in FIG. 10) side. It is attached to the part 414c. In the LED light source substrate 421, the mounting surface 421 a on which the green LED light source 419 is mounted is opposed to the other end surface on the long side of the light guide plate 422. A wiring pattern (not shown) for supplying power to the green LED light source 419 is patterned on the mounting surface 421a of the LED light source substrate 421, and a plurality of green LED light sources 419 are spaced along the X-axis direction. It is implemented in a line-up form. Specifically, in the plurality of green LED light sources 419, the interval between adjacent ones is made wider than the arrangement range in the X-axis direction in the red laser light source 417 and the blue laser light source 418 forming the same set. Then, the plurality of green LED light sources 419 are arranged (displaced) so as to be offset from the red laser light source 417 and the blue laser light source 418 in the X-axis direction.

As shown in FIG. 10, the light guide plate 422 has a horizontally long substantially rectangular shape when viewed in a plane, like the optical member 415 and the like. Of the outer peripheral end surfaces of the light guide plate 422, one of the long side end surfaces (the upper side shown in FIG. 10) faces the light emitting surfaces of the red laser light source 417 and the blue laser light source 418 and the laser beams of the respective colors are incident thereon. A laser incident portion (incident portion) 422a is provided, and the number and arrangement interval of the laser incident portions 422a are the same as the number of arrangement groups of the red laser light source 417 and the blue laser light source 418 and the arrangement interval between the respective groups. In the laser incident portion 422a, the formation range in the X-axis direction substantially coincides with the arrangement range of the red laser light source 417 and the blue laser light source 418 forming one set. Among the outer peripheral end faces of the light guide plate 422, the other end face on the long side (the lower side shown in FIG. 10) faces the light emitting face of the green LED light source 419 (facing directly), and the LED incident light on which green light is incident. Part 422b, and the installation number and arrangement interval thereof are the same as the installation number and arrangement interval of the green LED light sources 419. The LED light incident portion 422b has a formation range in the X-axis direction that is further left and right than the portion facing the green LED light source 419 in the other end face, and the right-hand facing portion (the arrangement range of the green LED light source 419). It has become wide. The reason is that the divergence angle of the green light emitted from the green LED light source 419 is larger than the divergence angles of the

laser light sources

417 and 418. Further, of the outer peripheral end surfaces of the light guide plate 422, the other end surface on the long side having the LED light incident portion 422b is a portion positioned on the side opposite to the laser light incident portion 422a (light incident opposite portion (light incident). Light opposite portion) 422e. A plurality of laser incident light opposite portions 422e are arranged on the other end surface of the light guide plate 422 in a form alternately arranged along with the LED incident light portions 422b along the X-axis direction, and the number and arrangement intervals of the laser incident light portions 422e are red laser light sources. The number of installation groups 417 and the blue laser light source 418 and the arrangement interval between the groups are the same. As shown in FIGS. 11 and 12, the light guide plate 422 has a light-emitting plate surface 422 c that emits light toward the liquid crystal panel 411 and the optical member 415, of the pair of front and back plate surfaces. The plate surface facing the back side is the light output opposite plate surface 422d opposite to the light output plate surface 422c. As described above, the light guide plate 422 introduces light emitted from the light sources 417 to 419 along the Y-axis direction from the

light incident portions

422a and 422b, and after propagating the light internally, extends in the Z-axis direction. And has a function of emitting light from the light exit plate surface 422c toward the optical member 415 side (front side, light emission side).

As shown in FIG. 11, the reflection sheet 423 is disposed so as to cover the light output opposite plate surface 422 d of the light guide plate 422. The reflection sheet 423 is excellent in light reflectivity, and can efficiently start the light leaked from the light output opposite plate surface 422d of the light guide plate 422 toward the front side (light output plate surface 422c). The reflection sheet 423 has an outer shape that is slightly larger than the light guide plate 422, and both ends on the long side protrude from the

light incident portions

422a and 422b of the light guide plate 422 toward the light sources 417 to 419, respectively. It is arranged with.

The light guide plate support members 424 are made of synthetic resin, and as shown in FIGS. 11 and 12, a pair of light guide plate support members 424 are provided so as to support both ends of the long side of the light guide plate 422 from the back side. The light guide plate support member 424 is disposed so as to be interposed between the bottom portion 414a of the chassis 414 and the reflection sheet 423. The light guide plate 422 is lifted from the bottom portion 414a so as not to be in direct contact with the bottom portion 414a. I support it. Thus, the positional relationship between the light sources 417 to 419 and the light guide plate 422 in the Z-axis direction can be stably maintained, and in addition, the heat generated by the light emission from the light sources 417 to 419 Even if it is transmitted to the chassis 414 via the

substrates

420 and 421, it is difficult to transmit from the chassis 414 to the light guide plate 422. The light guide plate support member 424 extends along the long side direction of the light guide plate 422 and the reflection sheet 423 and directly contacts the reflection sheet 423, and from both ends of the main body portion 424a in the Y-axis direction to the back side. And a pair of leg portions 424b that contact the bottom portion 414a of the chassis 414.

Here, the main emission wavelength and emission spectrum of each of the light sources 417 to 419 provided in the backlight device 412 are shown in FIG. 7 as in the second embodiment. Further, the transmission spectrum in each colored portion of the color filter provided in the liquid crystal panel 411 is also shown in FIG. 7 as in the second embodiment.

Now, as shown in FIGS. 10 and 11, the backlight device 412 according to this embodiment includes a diffuse reflection member 426 for diffusing and reflecting the laser beams of each color propagating through the light guide plate 422. The diffuse reflection member 426 is made of a synthetic resin (for example, made of PCT resin) having a white surface with excellent light reflectivity, and is opposed to the LED light source substrate 421 on the outer peripheral end surface of the light guide plate 422. It is arranged so as to face the laser incident light opposite portion 422e on the other end face on the other long side (lower side shown in FIG. 10). A plurality of the diffuse reflection members 426 are arranged on the other end face of the light guide plate 422 in a form alternately arranged along the X-axis direction with the LED light incident portions 422b. It is the same as the installation number and arrangement interval of 422e (the number of installation sets of red laser light source 417 and blue laser light source 418 and the arrangement interval between each set). The diffuse reflection member 426 is provided integrally with the LED light source substrate 421 and is physically separated from the light guide plate 422. The diffuse reflection member 426 is disposed so as to be sandwiched between the light guide plate 422 and the LED light source substrate 421 in the Y-axis direction, and is disposed adjacent to the green LED light source 419 in the X-axis direction. .

According to such a configuration, when the red laser light and the blue laser light emitted from the red laser light source 417 and the blue laser light source 418 are incident on the laser incident portion 422 a of the light guide plate 422, they travel straight in the light guide plate 422. Thus, it reaches the laser incident light opposite portion 422e located on the opposite side to the laser incident portion 422a. The red laser beam and the blue laser beam that have reached the laser incident light opposite portion 422e are diffused and reflected by the diffuse reflection member 426, and then proceed toward the laser incident portion 422a while diffusing in the light guide plate 422. The light exits from the light exit plate surface 422c. In this manner, the diffuse reflection member 426 disposed on the same side as the green LED light source 419 in the Y-axis direction emits pseudo red and blue diffused light having a divergence angle equal to or greater than that of the green LED light source 419. It functions as a red diffuse light source and a blue diffuse light source. As a result, the red light and blue light diffusely reflected by the diffuse reflection member 426 are mixed well in the light guide plate 422 together with the green light emitted from the green LED light source 419 and incident on the LED light incident part 422b. The white light without unevenness is emitted from the light output plate surface 422c, and the luminance uniformity and chromaticity uniformity are both high. Further, as compared with a conventional configuration in which a light guide bar is individually used for each light source, the light guide plate 422 is used, which is preferable in reducing the number of components. In addition, since the diffuse reflection member 426 is physically separated from the light guide plate 422, the positional relationship with respect to the

laser light sources

417 and 418 is independent of the positional relationship of the light guide plate 422 with respect to the

laser light sources

417 and 418. Determined. Therefore, even if the light guide plate 422 is displaced with respect to the

laser light sources

417 and 418, the positional relationship of the diffuse reflection member 426 with respect to the

laser light sources

417 and 418 is stably maintained, and thus red and blue It is assumed that each of the laser beams is reliably diffused and reflected by the diffuse reflection member 426. Further, the diffuse reflection member 426 is arranged in a form facing the laser incident light opposite portion 422e of the light guide plate 422 using the LED light source substrate 421 on which the green LED light source 419 is mounted. Note that white balance relating to an image displayed on the liquid crystal panel 411 can be controlled by adjusting the outputs of the red laser light source 417, the blue laser light source 418, and the green LED light source 419. , B does not need to be adjusted for each pixel.

As described above, the LED light source substrate 421 on which the diffuse reflection member 426 is integrally provided is common to the laser light source substrate 420 on which the red laser light source 417 and the blue laser light source 418 are mounted, as shown in FIGS. It is attached to the chassis 414. Therefore, compared with the case where the diffuse reflection member is provided integrally with the light guide plate 422, the red laser light source 417, the blue laser light source 418, and the diffuse reflection member 426 are positioned higher in the X-axis direction and the Z-axis direction. It is possible to align with accuracy. Thereby, the certainty of appropriately exerting the light diffuse reflection function by the diffuse reflection member 426 becomes high.

The LED light source substrate 421 and the diffuse reflection member 426 are preferably disposed on the lower side in the vertical direction with respect to the light guide plate 422 as shown in FIGS. Note that the top and bottom in FIG. 10 coincide with the top and bottom in the vertical direction, the left side in FIG. 11 coincides with the lower side in the vertical direction, and the right side in FIG. The diffuse reflection member 426 is arranged in contact with the laser incident light opposite portion 422e of the light guide plate 422. In this way, the diffuse reflection member 426 can be continuously held in close contact with the laser incident light opposite portion 422e using gravity (self-weight) acting on the light guide plate 422, and the laser incident light is opposite. It is difficult for a gap to be formed between the portion 422e and the diffuse reflection member 426. As a result, the red laser beam and the blue laser beam are less likely to leak from the laser incident light opposite portion 422e, and the certainty of being diffused and reflected by the diffuse reflection member 426 and being effectively used is high.

As shown in FIG. 10, the diffuse reflection member 426 and the laser incident light opposite portion 422e are arranged in the X axis direction in the red laser light source 417 and the blue laser light source 418 in which the formation range in the X axis direction forms one set. And are almost equal. In other words, the diffuse reflection member 426 has a formation range straddling the red laser light source 417 and the blue laser light source 418 forming one set. According to such a configuration, the diffuse reflection member 426 causes the red color to be red compared to the case where the diffuse reflection member is provided individually corresponding to the red laser light source 417 and the blue laser light source 418 that form a pair. Laser light and blue laser light can be efficiently scattered and reflected, and the diffuse reflection member 426 can be easily installed.

As described above, the backlight device (illumination device) 412 of this embodiment includes the red laser light source 417 and the blue laser light source 418 that are laser light sources that emit laser light, and the red laser light source 417 that is the laser light source among the outer peripheral end surfaces. The portion directly facing the blue laser light source 418 is a laser incident portion (incident portion) 422a on which laser light is incident, and the portion located on the opposite side of the laser incident portion 422a on the outer peripheral end surface is the laser incident portion. A light guide plate 422 that is a light opposite portion (light incident opposite portion) 422e and one of a pair of plate surfaces is a light exit plate surface 422c that emits light, and a laser light incident opposite portion 422e of the light guide plate 422 And a diffuse reflection member 426 that is arranged in a face-to-face relationship and is physically separated from the light guide plate 422 and diffuses and reflects the laser light.

According to such a configuration, the laser light emitted from the red laser light source 417 and the blue laser light source 418 that are laser light sources is incident on the laser incident portion 422a of the light guide plate 422 and travels straight in the light guide plate 422. To the laser incident light opposite portion 422e. The laser light that has reached the laser incident light opposite portion 422e is diffusely reflected by the diffuse reflection member 426 arranged in a form facing the laser incident light opposite portion 422e, so that the laser beam is diffused in the light guide plate 422. After traveling toward the light incident portion 422a, the light exits from the light exit plate surface 422c. As a result, the luminance uniformity of the emitted light is high within the surface of the light output plate surface 422c. Further, as compared with a conventional configuration in which a light guide bar is individually used for each light source, the light guide plate 422 is used, which is preferable in reducing the number of components.

Since the diffuse reflection member 426 is physically separated from the light guide plate 422, the red laser light source that is a laser light source regardless of the positional relationship of the light guide plate 422 with respect to the red laser light source 417 and the blue laser light source 418 that are laser light sources. The positional relationship with respect to 417 and the blue laser light source 418 is determined. Therefore, even if the light guide plate 422 is displaced with respect to the red laser light source 417 and the blue laser light source 418 that are laser light sources, the diffuse reflection member 426 for the red laser light source 417 and the blue laser light source 418 that are laser light sources. Therefore, the laser beam is diffused and reflected by the diffuse reflection member 426 with high certainty.

The light source plate 422 includes a green LED light source 419 that is an LED light source and an LED light source substrate 421 that is mounted with the green LED light source 419 that is an LED light source and faces the laser incident light opposite portion 422e. At least a portion of the end face that directly faces the green LED light source 419 that is an LED light source is an LED light incident part 422b into which the light of the green LED light source 419 that is an LED light source is incident, and the diffuse reflection member 426 is an LED light source. A substrate 421 is provided. In this way, the light emitted from the green LED light source 419 that is the LED light source is incident on the LED light incident part 422b of the light guide plate 422, propagated through the light guide plate 422, and then emitted from the light exit plate surface 422c. The The diffuse reflection member 426 can be arranged in a form facing the laser incident light opposite portion 422e of the light guide plate 422 using an LED light source substrate 421 on which a green LED light source 419 as an LED light source is mounted.

Further, a laser light source substrate 420 on which a red laser light source 417 and a blue laser light source 418, which are laser light sources, are mounted and opposed to the laser incident portion 422a, a laser light source substrate 420 and an LED light source substrate 421 are attached, and a light guide plate A chassis (housing) 414 that accommodates 422. In this way, the laser light source substrate 420 and the LED light source substrate 421 provided with the diffuse reflection member 426 are attached to the common chassis 414. Therefore, the red laser light source 417 and the blue laser light source 418, which are laser light sources, are provided. This is suitable for maintaining high positional accuracy related to the positional relationship with the diffuse reflection member 426.

Further, the LED light source substrate 421 is disposed on the lower side in the vertical direction with respect to the light guide plate 422, and the diffuse reflection member 426 is disposed in contact with the laser incident light opposite portion 422e of the light guide plate 422. . In this way, the laser incident light opposite portion 422e and the diffuse reflection member 426 can be kept in close contact with each other by utilizing the gravity acting on the light guide plate 422. As a result, light leakage hardly occurs between the laser incident light opposite portion 422e and the diffuse reflection member 426, and the light use efficiency is excellent.

The laser light source includes a red laser light source 417 that emits red laser light and a blue laser light source 418 that emits blue laser light, whereas the LED light source includes a green LED light source 419 that emits green light. include. In this way, the diffuse reflection member 426 is a pseudo red diffused light source that emits diffused light by diffusing and reflecting the red laser light and the blue laser light emitted from the red laser light source 417 and the blue laser light source 418. Since it functions as a blue diffused light source, the red light and blue light diffusely reflected by the diffuse reflection member 426 are good in the light guide plate 422 together with the green light emitted from the green LED light source 419 and incident on the LED light incident part 422b. And is emitted as white light from the light output plate surface 422c. The red laser light emitted from the red laser light source 417 and the blue laser light emitted from the blue laser light source 418 hardly interfere with each other in the wavelength range, and also with respect to the green light emitted from the green LED light source 419. It is assumed that the wavelength range hardly interferes. Thereby, the color purity of each color becomes sufficiently high. Moreover, since the green LED light source 419 has better luminous efficiency than a green laser light source that emits green laser light, high luminance can be obtained with low power consumption.

Also, the red laser light source 417 and the blue laser light source 418 are arranged adjacent to each other, and the diffuse reflection member 426 has a formation range straddling the red laser light source 417 and the blue laser light source 418. In this way, the red laser light and the blue laser light can be efficiently scattered and reflected by the diffuse reflection member 426 having a formation range extending between the red laser light source 417 and the blue laser light source 418 adjacent to each other.

In addition, the liquid crystal display device (display device) 410 according to the present embodiment includes the backlight device 412 described above and a liquid crystal panel (display panel) 411 that displays an image using light emitted from the backlight device 412. And comprising. According to the liquid crystal display device 410 having such a configuration, the number of components of the backlight device 412 is reduced, and it is highly reliable that the laser light is diffusely reflected by the diffuse reflection member 426 in the backlight device 412. The cost can be reduced and a display with excellent display quality can be realized.

Further, the television receiver 410TV according to the present embodiment includes the liquid crystal display device 410 described above. According to such a television receiver 410TV, the manufacturing cost of the liquid crystal display device 410 is reduced and the display quality is excellent. Therefore, the television image is excellent in price competitiveness and excellent in display quality. Display can be realized.

<Embodiment 6>
A sixth embodiment of the present invention will be described with reference to FIG. 13 or FIG. In the sixth embodiment, a diffuse reflection member is changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 5 is abbreviate | omitted.

The diffuse reflection member 5126 according to the present embodiment is provided on the light guide plate support member 5124 as shown in FIGS. Specifically, of the pair of light guide plate support members 5124 that respectively support both ends of the light guide plate 5122 in the Y axis direction, the Y light source plate 5122 is disposed on the opposite side of the laser light source substrate 5120 side, that is, on the LED light source substrate 5121 side. The light guide plate support member 5124 is provided with a diffuse reflection member 5126. The diffuse reflection member 5126 is provided so as to rise from the main body portion 5124a constituting the light guide plate support member 5124 toward the front side (the side opposite to the protruding side of the leg portion 5124b), and is opposite to the light incident on the light guide plate 5122. It is arranged so as to face the portion 5122e. A plurality of diffuse reflection members 5126 are arranged in the main body portion 5124a at intervals in the X-axis direction, and the arrangement thereof matches the arrangement of the plurality of laser light incident opposite portions 5122e in the light guide plate 5122. The diffuse reflection member 5126 is in direct contact with the laser incident light opposite portion 5122e of the light guide plate 5122, but is separated from the LED light source substrate 5121 (disposed with an interval). In this way, the diffuse reflection member 5126 can be disposed in a form facing the laser incident light opposite portion 5122e of the light guide plate 5122 by using the light guide plate support member 5124 for supporting the light guide plate 5122.

As described above, according to the present embodiment, the light guide plate support member 5124 that supports the light guide plate 5122 from the side opposite to the light output plate surface 5122 c is provided, and the diffuse reflection member 5126 is provided on the light guide plate support member 5124. Provided. In this way, the light guide plate 5122 is supported by the light guide plate support member 5124 from the side opposite to the light output plate surface 5122c side, so that the red laser light source 5117 and the blue laser light source 5118, which are laser light sources, and the laser incident light. The positional relationship with the portion 5122a is stably maintained. Using this light guide plate support member 5124, the diffuse reflection member 5126 can be arranged in a form facing the laser incident light opposite portion 5122 e of the light guide plate 5122.

<Embodiment 7>
A seventh embodiment of the present invention will be described with reference to FIG. In the seventh embodiment, the configuration of the laser light incident section and the LED light incident section is changed from the above-described fifth embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 5 is abbreviate | omitted.

In the light guide plate 6222 according to the present embodiment, as shown in FIG. 15, a light refracting portion 627 is provided on each of the laser incident portion 6222a and the LED incident portion 6222b on the outer peripheral end face. The light refracting unit 627 is formed by processing the surfaces of the laser incident unit 6222a and the LED incident unit 6222b so that the cross-sectional shape is prismatic. The light refracting unit 627 has a refracting action that expands the divergence angle to each laser beam incident on the laser incident unit 6222a from each

laser light source

6217, 6218 or green light incident on the LED incident unit 6222b from the green LED light source 6219. Is given. Each light to which the refractive action is imparted by the light refracting unit 627 travels in the light guide plate 6222 away from the respective

light incident units

6222a and 6222b in the Y-axis direction (for example, opposite to the laser incident light from the laser light incident unit 6222a side). Diverges in the X-axis direction in the process of proceeding toward the portion 6222e, and the light distribution range is gradually expanded. In particular, each laser beam is diffused and reflected while being irradiated to the diffuse reflection member 6226 in a wider range when reaching the laser incident light opposite portion 6222e by expanding the light distribution range by the light refracting portion 627. Further, the diffusion range of the diffuse reflection light by the diffuse reflection member 6226 becomes wider. Thereby, the luminance uniformity of the emitted light is made higher in the plane of the light output plate surface 6222c of the light guide plate 6222.

As described above, according to this embodiment, at least the laser incident portion 6222a on the outer peripheral end surface of the light guide plate 6222 has a light distribution range of laser light incident on the laser incident portion 6222a from the laser incident portion 6222a side. A light refracting portion 627 that imparts a refracting action to the laser light is provided so as to spread toward the laser incident light opposite portion 6222e. In this way, the laser light emitted from the red laser light source 6217 and the blue laser light source 6218, which are laser light sources, is refracted by the light refracting unit 627 when entering the laser incident unit 6222a. The light distribution range of the laser light imparted with the refraction action is expanded in the process of traveling through the light guide plate 6222 from the laser light incident part 6222a toward the laser incident light opposite part 6222e. Accordingly, the laser light reaching the laser incident light opposite portion 6222e is diffused and reflected while being irradiated on the diffuse reflection member 6226 in a wider range, and therefore the diffusion range of the diffuse reflection light by the diffuse reflection member 6226 is wider. Become. Thereby, the brightness uniformity of the emitted light is made higher in the plane of the light exit plate surface 6222c.

<Embodiment 8>
An eighth embodiment of the present invention will be described with reference to FIG. In the eighth embodiment, the arrangement of the red laser light source 7317 and the blue laser light source 7318 is changed from the fifth embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 5 is abbreviate | omitted.

As shown in FIG. 16, the red laser light source 7317 and the blue laser light source 7318 according to the present embodiment are arranged in such a manner that one set is close to each other. That is, the arrangement is such that there is almost no gap between the red laser light source 7317 and the blue laser light source 7318 forming one set in the X-axis direction. As a result, the arrangement range of the red laser light source 7317 and the blue laser light source 7318 in the X-axis direction is narrowed, and accordingly, the formation range of the diffuse reflection member 7326 can be narrowed. In such a configuration, the red laser light and the blue laser light emitted from the red laser light source 7317 and the blue laser light source 7318 and diffusely reflected by the diffuse reflection member 7326 in the light guide plate 7322 are compared to the fifth embodiment described above. The green light from each other or the green LED light source 7319 is hardly mixed. For this reason, in the light guide plate 7322, the end portions on the green LED light source 7319 and the diffuse reflection member 7326 side are mixed color regions for mixing red laser light, blue laser light, and green light (from the one-dot chain line shown in FIG. 16). (Lower area) MA is set.

<Ninth Embodiment>
A ninth embodiment of the present invention will be described with reference to FIG. 17 or FIG. In the ninth embodiment, a green laser light source is used instead of the green LED light source from the fifth embodiment. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 5 is abbreviate | omitted.

As shown in FIGS. 17 and 18, the backlight device 8412 according to the present embodiment does not include an LED light source as a light source, but includes a red laser light source 8417, a blue laser light source 8418, and a green laser light source 828. Yes. In FIG. 17, the green laser light source 828 is provided with an oblique stripe pattern for distinction. The red laser light source 8417, the blue laser light source 8418, and the green laser light source 828 are mounted on a common laser light source substrate 8420, and are arranged repeatedly in a row along the X-axis direction. Accordingly, the backlight device 8412 is provided with the laser light source substrate 8420 at one end in the short side direction, and the light from each of the

laser light sources

828, 8417, 8418 is transmitted from one side to the light guide plate 8422. It is an edge light type of one side incident type that is incident. One end surface (the upper side shown in FIG. 17) of the long side of the outer peripheral end surface of the light guide plate 8422 has a laser incident portion 8422a that faces the red laser light source 8417 and a laser incident portion 8422a that faces the blue laser light source 8418. , And a laser beam incident portion 8422a that directly faces the green laser light source 828. On the other hand, the other end surface (the lower side shown in FIG. 17) on the long side of the outer peripheral end surface of the light guide plate 8422 has a portion located on the side opposite to the above-described laser incident portions 8422a, respectively. It is said.

The diffuse reflection member 8426 is arranged so as to face the other end surface (the end surface having the laser incident light opposite portion 8422e) of the outer peripheral end surface of the light guide plate 8422 over almost the entire region. That is, the diffuse reflection member 8426 directly faces a portion adjacent to the laser incident light opposite portion 8422e in addition to the plurality of laser incident light opposite portions 8422e that are intermittently arranged in the X-axis direction on the other end surface. In this way, the laser light of each color can be diffusely reflected regardless of the positional relationship in the X-axis direction of the diffuse reflection member 8426 with respect to the

laser light sources

828, 8417, and 8418. Therefore, the laser light of each color is diffusely reflected. The certainty of diffuse reflection by the member 8426 is high. In addition, since it is not necessary to align the diffuse reflection member 8426 with respect to the

laser light sources

828, 8417, and 8418 in the X-axis direction during assembly, manufacturing is facilitated. The diffuse reflection member 8426 is a light guide plate disposed on the side opposite to the laser light source substrate 8420 side in the Y-axis direction among the pair of light guide plate support members 8424 that respectively support both ends of the light guide plate 8422 in the Y-axis direction. The support member 8424 is provided. Since the diffuse reflection member 8426 provided on the light guide plate support member 8424 has the same configuration as that of the above-described sixth embodiment, a duplicate description is omitted.

<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 addition to the above-described embodiments, as a diffuse reflection member, a multilayer film reflection sheet or metal material having a dielectric multilayer film structure in which a foamed resin material made of PET or the like and a large number of dielectric layers having different refractive indexes are laminated It is also possible to use a metal reflective film made of or the like.
(2) In each embodiment described above, the diffuse reflection member is attached to the light guide plate with an adhesive or a double-sided tape, and the diffused reflection member is provided by post-processing the manufactured light guide plate. However, the diffuse reflection member may be attached to the light guide plate in the process of manufacturing the light guide plate. Specifically, when the diffuse reflection member is a metal reflection film in the above (1), the metal reflection film can be directly deposited on the light guide plate.
(3) Besides the above-described embodiments, the arrangement of the laser light source substrate and the LED light source substrate with respect to the light guide plate in the Y-axis direction can be changed as appropriate.
(4) In the above-described Embodiments 2 to 4, the configuration in which only one green LED light source is interposed between adjacent diffuse reflection members is shown, but a plurality of green LED light sources are interposed between adjacent diffuse reflection members. It is also possible to adopt a configuration. That is, a plurality of green LED light sources may be arranged so that a plurality of green LED light sources form one set.
(5) In addition to the above-described embodiments, the specific formation range and arrangement of the diffuse reflection member can be appropriately changed.
(6) In the above-described Embodiments 2 to 4, the configuration using only green as the LED light source has been described. However, any one of red or blue may be used as the LED light source, and the green laser light source may be included. . Two of red, green, and blue may be LED light sources, and the remaining one may be a laser light source. In that case, for example, red can be used as a laser light source, and a blue-green (cyan) LED light source can be used.
(7) As a modification of the above-described third embodiment, a light refracting portion may be provided over the entire area of one end surface facing the laser light source substrate. Moreover, it is also possible to omit the light refracting part for the LED light incident part.
(8) The configuration described in the third embodiment (light refraction unit) can be combined with the configuration described in the first embodiment or the configuration described in the fourth embodiment.
(9) In addition to the above-described embodiments, specific emission spectra (numerical values such as the main emission wavelength and the half-value width) relating to the red laser light source, the blue laser light source, and the green LED light source can be changed as appropriate.
(10) In addition to the above-described embodiments, specific transmission spectra (numerical values such as peak wavelength and half-value width) relating to the colored portions of R, G, and B constituting the color filter can be appropriately changed. .
(11) In each of the above-described embodiments, the color filter of the liquid crystal panel is exemplified by the three-color configuration of red, green, and blue. However, the four-color configuration is obtained by adding yellow or white to red, green, and blue. The present invention can also be applied to those provided with the color filter.
(12) In each of the above-described embodiments, the case where the operation mode of the liquid crystal panel is set to the VA mode has been described. However, an FFS (Fringe Field Switching) mode or the like may be used. In the FFS mode, the counter electrode on the CF substrate side is removed, and a common electrode for forming an electric field with the pixel electrode is provided on the array substrate side.
(13) In each of the above-described embodiments, the case where the planar shape of the liquid crystal display device (liquid crystal panel or backlight device) is a horizontally long square is shown, but the planar shape of the liquid crystal display device is a vertically long square, square, An oval shape, an elliptical shape, a circular shape, a trapezoidal shape, a shape having a partially curved surface, or the like may be used.
(14) In Embodiments 5 to 9 described above, the case where the diffuse reflection member is integrally provided on the LED light source substrate and the light guide plate support member has been described. However, the diffuse reflection member is provided integrally on the bottom or side of the chassis. It doesn't matter. In addition, the diffuse reflection member may be attached to any one of the LED light source substrate, the light guide plate support member, the chassis and the like while being separated.
(15) In the above fifth to ninth embodiments, each laser light source and laser light source substrate are arranged on the upper side in the vertical direction with respect to the light guide plate, and the diffuse reflection member is arranged on the lower side in the vertical direction with respect to the light guide plate. Although cases have been shown, it is possible to reverse these arrangements.
(16) In Embodiments 6 to 9 described above, the configuration in which only one green LED light source is interposed between adjacent diffuse reflection members has been described. However, a plurality of green LED light sources are interposed between adjacent diffuse reflection members. It is also possible to adopt a configuration. That is, a plurality of green LED light sources may be arranged so that a plurality of green LED light sources form one set.
(17) In Embodiments 5 to 8 described above, the configuration in which only green is used as the LED light source has been described. However, any one of red or blue may be used as the LED light source, and the green laser light source may be included. . Two of red, green, and blue may be LED light sources, and the remaining one may be a laser light source. In that case, for example, red can be used as a laser light source, and a blue-green (cyan) LED light source can be used.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device) 11, 111 ... Liquid crystal panel (display panel), 12, 112, 412, 8412 ... Backlight device (illumination device), 17, 117, 217, 317, 417, 8417 ... Red Laser light source (laser light source), 18, 118, 218, 318, 418, 8418 ... blue laser light source (laser light source), 19,828 ... green laser light source (laser light source), 20, 120, 420, 8420 ... laser

light source substrate

22, 122, 222, 322, 422, 5122, 6222, 7322, 8422... Light guide plate, 22 a, 122 a, 222 a, 322 a, 422 a, 5122 a, 6222 a, 8422 a. 222b, 422b, 6222b ... LED light incident part, 22c, 222c, 422c, 512 c, 6222c... light exit plate surface, 22e, 122e, 222e, 422e, 5122e, 6222e, 8422e... laser incident light opposite portion (light incident opposite portion), 26, 126, 226, 326, 426, 5126, 6226, 7326, 8426: Diffuse reflection member, 27, 227, 419, 6219, 7319 ... Green LED light source (LED light source), 28, 421, 5121 ... LED light source substrate, 29, 627 ... Light refracting section

Claims

A laser light source that emits laser light;
A portion of the outer peripheral end face that directly faces the laser light source is a light incident portion on which the laser light is incident, and a portion of the outer peripheral end surface that is located on the opposite side of the light incident portion is a light incident opposite portion. , A light guide plate that is a light output plate surface from which any one of the pair of plate surfaces emits light;
An illuminating device comprising: a diffuse reflection member that is attached in contact with the light incident opposite portion of the light guide plate and diffusely reflects the laser light.
The laser light source includes a red laser light source that emits red laser light, a green laser light source that emits green laser light, and a blue laser light source that emits blue laser light, and the red laser light source, the green laser light source, and The blue laser light sources are arranged in a row,
The illuminating device according to claim 1, wherein the diffuse reflection member is disposed over an entire area of the end face having the light incident opposite portion of the outer peripheral end face of the light guide plate.
An LED light source, and an LED light source substrate on which the LED light source is mounted and opposed to the light incident opposite portion, and the light guide plate has at least a portion facing the LED light source on the outer peripheral end surface. It is an LED light incident part into which the light from the LED light source is incident,
The illumination device according to claim 1, wherein the diffuse reflection member is arranged adjacent to the LED light incident portion.
A laser light source that emits laser light;
A portion of the outer peripheral end face that directly faces the laser light source is a light incident portion on which the laser light is incident, and a portion of the outer peripheral end surface that is located on the opposite side of the light incident portion is a light incident opposite portion. , A light guide plate that is a light output plate surface from which any one of the pair of plate surfaces emits light;
An illuminating device comprising: a diffusive reflecting member that is arranged in a shape facing the light incident opposite portion of the light guide plate, is physically separated from the light guide plate, and diffuses and reflects the laser light.
An LED light source;
An LED light source substrate on which the LED light source is mounted and opposed to the light incident opposite portion;
In the light guide plate, at least a portion of the outer peripheral end face that directly faces the LED light source is an LED light incident portion on which light of the LED light source is incident,
The illumination device according to claim 4, wherein the diffuse reflection member is provided on the LED light source substrate.
A laser light source substrate mounted with the laser light source and facing the light incident portion;
The lighting device according to claim 5, further comprising: a housing for mounting the laser light source substrate and the LED light source substrate and accommodating the light guide plate.
The LED light source substrate is arranged on the lower side in the vertical direction with respect to the light guide plate,
The illumination device according to claim 5, wherein the diffuse reflection member is arranged in contact with the light incident opposite portion of the light guide plate.
The laser light source includes a red laser light source that emits red laser light and a blue laser light source that emits blue laser light.
The illumination device according to any one of claims 3, 5, 6, and 7, wherein the LED light source includes a green LED light source that emits green light.
The red laser light source and the blue laser light source are arranged adjacent to each other,
The illumination device according to claim 8, wherein the diffuse reflection member has a formation range straddling the red laser light source and the blue laser light source.
A light guide plate support member that supports the light guide plate from the side opposite to the light exit plate surface side;
The illumination device according to claim 4, wherein the diffuse reflection member is provided on the light guide plate support member.
At least the light incident portion on the outer peripheral end surface of the light guide plate has the laser light such that a light distribution range of the laser light incident on the light incident portion is widened from the light incident portion side toward the light incident opposite portion. The illuminating device according to claim 1, further comprising a light refracting section that imparts a refractive action to the light.
The lighting device according to any one of claims 1 to 11,
A display panel that displays an image using light emitted from the illumination device.
A television receiver comprising the display device according to claim 12.