TW201827743A - Illumination device, display device, and television receiving device - Google Patents

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 receiving device  

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

The invention described in Patent Document 1 below is known as an example of a backlight device used in a conventional liquid crystal display device. The backlight device described in Patent Document 1 includes a backlight frame having a light exit surface, a diffusion plate, a cymbal sheet, and a reflective polarizer disposed on the light exit surface of the backlight frame, and a reflective polarizer; a laser light source disposed on one of the end faces; an LED light source disposed along the other end faces of the backlight frame; and a method of diffusing and emitting the laser light in the backlight frame while propagating the laser light from the laser light source A long-length extending laser light guiding rod; and a LED light guiding rod extending in a long strip shape by diffusing and emitting LED light in the backlight frame while transmitting LED light from the LED light source.

[Previous Technical Literature]

[Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2014-26132

In the liquid crystal display device described in Patent Document 1, since the laser light guide bar and the LED light guide bar are individually provided for each of the laser light source and the LED light source, the number of components is increased.

The present invention has been made in view of the above circumstances, and has been completed for the purpose of reducing the number of parts.

A lighting device according to the first aspect of the invention includes a laser light source, a light guide plate, and a diffuse reflection member; the laser light source emits laser light; and the light guide plate has the outer peripheral end surface of the laser light source portion a portion of the outer peripheral end surface of the outer peripheral end surface opposite to the light incident portion is a light incident opposite portion, and one of the pair of plate surfaces is a light exiting plate surface for emitting light; the diffusion The reflecting member is mounted in contact with the light incident portion of the light guide plate, and diffuses and reflects the laser light.

In such a manner, the laser light emitted by the laser light source is incident on the light incident portion of the light guide plate, and is directed in the light guide plate toward the opposite portion of the light incident. The laser light reaching the opposite portion of the light incident is diffused and reflected by the diffuse reflection member, and the diffused reflection member is mounted in contact with the opposite portion of the light incident, whereby the laser light is diffused in the light guide plate and directed toward After the light portion side travels, it is emitted from the light exit plate surface. Therefore, in the plane of the light-emitting plate surface, the brightness of the emitted light is uniform. Further, in contrast to the conventional use of the rod-shaped light guiding portion for each of the laser light sources, since the light guide plate is used in this aspect, it is preferable to reduce the number of parts. Further, the diffuse reflection member is attached in a form in contact with the light incident portion of the light guide plate, so that light becomes difficult to leak between the light incident opposite portion and the diffuse reflection member. Thereby, the utilization efficiency of light is excellent.

In the lighting device according to the first aspect described above, it is preferable to adopt the following configuration as an embodiment.

(1) the laser light source comprises a red laser light source emitting red laser light, a green laser light source emitting green laser light, and a blue laser light source emitting blue laser light, and the red laser light source, the green light The laser light source and the blue laser light source are arranged in a line shape, and the diffuse reflection member is disposed on the entire outer peripheral end surface of the light guide plate having an entire end surface of the light incident opposite portion. In this way, the laser light of each color emitted by the red laser light source, the green laser light source, and the blue laser light source arranged in an in-line form, when incident on the light incident portion of the light guide plate, is directed in the light guide plate. The opposite portion of the light incident is straight forward, and is diffused and reflected by the diffuse reflection member, wherein the diffuse reflection member is disposed in a form of being in contact with the opposite portion of the light incident. In this way, the light of each color is well mixed in the light guide plate, and is emitted as white light from the surface of the light exit plate. The diffuse reflection member is disposed on the entire outer peripheral end surface of the light guide plate having the entire end surface of the light incident opposite portion. Therefore, regardless of the positional relationship of the diffuse reflection member with respect to the laser light sources of the respective colors, the laser light of each color can be diffused. reflection. Therefore, the laser light of each color is highly diffused and reflected by the diffuse reflection member.

(2) an LED light source and an LED light source substrate having the LED light source and facing the opposite light incident portion; wherein at least the portion of the outer peripheral end surface of the light guide plate facing the LED light source is a light source of the LED light source The LED light incident portion; the diffuse reflection member is disposed in a form adjacent to the LED light incident portion. In this way, the light emitted by the LED light source enters the LED light incident portion of the light guide plate, propagates through the light guide plate, and is then emitted from the light exit plate surface. The diffuse reflection member is disposed adjacent to the LED light-injecting portion, and does not interfere with the light incident from the LED light source into the light-input portion of the LED, and can be directed toward the light-introducing portion from the light-incident portion toward the light-introducing portion. The traveling laser light diffuses and reflects 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. In contrast, the LED light source includes a green LED light source that emits green light. In this way, the diffuse reflection member diffuses and reflects the red laser light and the blue laser light emitted by the red laser light source and the blue laser light source, and can be used as a pseudo-red diffusion light source and a blue diffusion light source that emit diffused light. Since the red light and the blue light diffused and reflected by the diffuse reflection member are combined with the green light emitted from the green LED light source and incident on the light incident portion of the LED, they are well mixed together in the light guide plate. White light is emitted from the surface of the light exiting plate. The red laser light emitted by the red laser light source and the blue laser light emitted by the blue laser light source have almost no interference in the wavelength range, and even for the green light emitted by the green LED light source, The wavelength range is also a case where there is almost no interference. Therefore, the color purity of each color will be very high. Moreover, the green LED light source has a good luminous efficiency compared to a green laser light source that emits green laser light, so that high brightness can be obtained with low power consumption.

(4) The red laser light source and the blue laser light source are disposed in a form adjacent to each other; the diffuse reflection member is formed over the red laser light source and the blue laser light source. In this way, by forming the red laser light source and the diffuse reflection member of the blue laser light source which are adjacent to each other, the red laser light and the blue laser light can be efficiently scattered and reflected.

(5) at least the light incident portion of the outer peripheral end surface of the light guide plate is such that the light distribution range of the laser light incident on the light incident portion is increased from the light incident portion side toward the light incident portion In a manner, a light refracting portion that imparts a refractive action to the laser light is provided. In this way, the laser light emitted from the laser light source is refracted by the light refracting portion when it is incident on the light incident portion. The laser light to which the refractive effect is applied travels from the light incident portion toward the light incident portion in the light guide plate, and the light distribution range is expanded during the traveling. Therefore, the laser light that has arrived at the opposite portion of the light incident is irradiated onto the diffuse reflection member in a wider range and is diffused and reflected. Therefore, the diffusion range of the diffused reflection light through the diffusion reflection member becomes wider. Thereby, the brightness uniformity of the emitted light becomes higher in the plane of the light-emitting plate surface.

According to a second aspect of the present invention, a illuminating device includes a laser light source, a light guide plate, and a diffuse reflection member; the laser light source emits laser light; and the light guide plate has a portion of the outer peripheral end surface facing the laser light source The portion of the outer peripheral end surface of the outer peripheral end surface on the side opposite to the light incident portion is a light incident portion, and one of the pair of plate surfaces is a light exiting plate surface for emitting light; The diffuse reflection member is disposed in a form of the light incident opposite portion of the light guide plate, and is physically separated from the light guide plate to diffusely reflect the laser light.

According to such an aspect, the laser light emitted from the laser light source is incident on the light incident portion of the light guide plate, and is directed in the light guide plate toward the light incident portion. The laser light reaching the opposite portion of the light incident is diffused and reflected by the diffuse reflection member, and the diffuse reflection member is disposed in a form facing the opposite portion of the light, whereby the laser light diffuses in the light guide plate and faces the light entrance portion. After the side travels, it will be emitted from the light exit surface. Therefore, in the plane of the light-emitting plate surface, the brightness of the emitted light is uniform. In addition, compared with the conventional use of the light guide bar on each light source, since the light guide plate is used in this aspect, it is preferable to reduce the number of parts.

Since the diffuse reflection member is physically separated from the light guide plate, the positional relationship of the diffusion reflection member with respect to the laser light source is fixed irrespective of the positional relationship of the light guide plate with respect to the laser light source. Therefore, even if the position of the light guide plate is deviated with respect to the laser light source, the positional relationship of the diffuse reflection member with respect to the laser light source remains stable, so that the laser light is diffused and reflected by the diffusion reflection member with high reliability. .

The lighting device according to the second aspect described above is preferably embodied in the following configuration.

(1) an LED light source and an LED light source substrate having the LED light source and facing the opposite light incident portion; wherein at least the portion of the outer peripheral end surface of the light guide plate facing the LED light source is a light source of the LED light source The LED light incident portion is disposed; the diffuse reflection member is disposed on the LED light source substrate. In this way, the light emitted by the LED light source enters the LED light incident portion of the light guide plate and propagates through the light guide plate, and then exits from the light exit plate surface. With the LED light source substrate in which the LED light source is mounted, the diffuse reflection member can be disposed in the form of the opposite portion of the light guide plate.

(2) having a laser light source substrate and a frame; the laser light source substrate is equipped with the laser light source and facing the light incident portion; the laser light source substrate and the LED light source substrate are mounted on the frame body, and The light guide plate is housed. In this way, the laser light source substrate and the LED light source substrate provided with the diffuse reflection member are mounted on the common housing, so that the positional accuracy of maintaining the positional relationship between the laser light source and the diffuse reflection member is high, Preferably.

(3) The LED light source substrate is disposed on a lower side in a vertical direction with respect to the light guide plate; and the diffusion reflection member is disposed in contact with the light incident portion of the light guide plate. In this way, by the gravity acting on the light guide plate, the light incident opposite portion and the diffuse reflection member can be kept in close contact state. Thereby, light leakage between the light incident opposite portion and the diffusion reflection member becomes difficult to occur, 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. In contrast, the LED light source includes a green LED light source that emits green light. In this way, the diffuse reflection member diffuses and reflects the red laser light and the blue laser light emitted by the red laser light source and the blue laser light source, and can be used as a pseudo-red diffusion light source and a blue diffusion light source that emit diffused light. Since the red light and the blue light diffused and reflected by the diffuse reflection member and the green light emitted from the green LED light source and incident on the LED light incident portion are well mixed in the light guide plate, The white light is emitted from the surface of the light exiting plate. The red laser light emitted by the red laser light source and the blue laser light emitted by the blue laser light source have almost no interference in the wavelength range, and the wavelength of the green light emitted by the green LED light source The scope is also a situation where there is almost no interference. Thereby, the color purity of each color becomes extremely high. Moreover, the green LED light source has a good luminous efficiency compared to a green laser light source that emits green laser light, so that high brightness can be obtained with low power consumption.

(5) The red laser light source and the blue laser light source are disposed in a form adjacent to each other; the diffuse reflection member is formed over the red laser light source and the blue laser light source. In this way, by forming the red laser light source that is adjacent to each other and the diffuse reflection member of the blue laser light source, the red laser light and the blue laser light can be efficiently scattered and reflected.

(6) A light guide plate supporting member that supports the light guide plate on the opposite side of the light guide plate surface side is provided, and the diffusion reflection member is provided on the light guide plate supporting member. In this way, the light guide plate is supported by the opposite side of the light guide plate surface side by the light guide plate supporting member, whereby the positional relationship between the laser light source and the light incident portion can be stabilized. With the light guide plate supporting member, the diffuse reflection member can be disposed in a form facing the opposite portion of the light guide plate.

(7) at least the light incident portion of the outer peripheral end surface of the light guide plate is such that the light distribution range of the laser light incident on the light incident portion is increased from the light incident portion side toward the light incident portion In a manner, a light refracting portion that imparts a refractive action to the laser light is provided. In this way, the laser light emitted from the laser light source is refracted by the light refracting portion when it is incident on the light incident portion. The laser light to which the refractive effect is applied travels from the light incident portion toward the light incident portion in the light guide plate, and the light distribution range is expanded during the traveling. Therefore, the laser light that has arrived at the opposite portion of the light incident is irradiated onto the diffuse reflection member in a wider range and is diffused and reflected. Therefore, the diffusion range of the diffused reflection light through the diffusion reflection member becomes wider. Thereby, the brightness uniformity of the emitted light becomes higher in the plane of the light-emitting plate surface.

In order to solve the above problems, the display device of the present invention includes the above-described illumination device and a display panel that displays an image using light irradiated by the illumination device. With such a display device, the number of components of the illumination device is reduced, and the light utilization efficiency of the illumination device is excellent. Therefore, while reducing the manufacturing cost, it is also desired to have low power consumption or high brightness. Preferably.

In order to solve the above problems, the television receiving device of the present invention includes the above display device. With such a television receiving device, as the manufacturing cost of the display device is lowered, the display quality is also excellent. Therefore, in addition to the advantage in price competitiveness, the television image with excellent display quality can also be obtained. Display and other implementations.

According to the present invention, the number of parts can be reduced.

10, 410, 510, 810‧‧‧ liquid crystal display device (display device)

10Ca, 10Cb‧‧‧back two-piece cabinet

10T‧‧‧ Tuner (Receipt Department)

10P‧‧‧Power supply

10S‧‧‧ tripod

10TV, 410TV‧‧‧TV receiving device

11, 111, 411, 511, 811‧‧‧ LCD panel (display panel)

12, 112, 412, 512, 612, 712, 8412‧‧ ‧ backlight device (lighting device)

13, 413, 513, 813‧‧ ‧ baffles

14, 114, 414, 514, 614, 714, 814‧‧‧ chassis (frame)

14a, 414a, 514a, 814a‧‧‧ bottom

14b, 414b, 514b, 614b, 714b, 814b‧‧‧ light emitting parts (openings)

14c, 114c, 414c, 514c, 614c, 714c, 814c‧‧‧ side

15, 415, 515, 815 ‧ ‧ optical components (optical sheets)

15a, 415a, 515a, 815a‧‧ ‧ microlens

15b, 415b, 515b, 815b‧‧‧ pictures

15c, 415c, 515c, 815c‧‧‧ polarizer

16,416,516,816‧‧‧ framework

16a, 416a, 516a, 816a‧‧‧ framed parts

16b, 416b, 516b, 816b‧‧‧ LCD panel support

17, 117, 217, 317, 417, 5117, 6217, 7317, 8417‧ ‧ red laser source (laser source)

18, 118, 218, 318, 418, 5118, 6218, 7318, 8418‧‧‧ Blue laser source (laser source)

19, 828‧‧ Green laser light source

20, 120, 420, 5120, 620, 720, 8420‧‧ ‧ laser source substrate

20a, 120a, 420a, 520a, 620a, 720a, 820a‧‧‧ the surface of the laser source substrate

22, 122, 222, 322, 422, 5122, 6222, 7322, 8422‧‧‧ light guide

22a, 122a, 222a, 322a, 422a, 5122a, 6222a, 722a, 8422a‧‧‧ laser into the light section (lighting section)

22b, 222b, 422b, 522b, 6222b, 722b‧‧‧LED into the light department

22c, 222c, 422c, 5122c, 6222c, 722c, 822c‧‧‧ light board

22d, 422d, 522d, 822d‧‧‧ light opposite board

22e, 122e, 222e, 422e, 5122e, 6222e, 722e, 8242e‧ ‧ ‧ laser into the opposite part of the light (in the opposite part of the light entrance)

23, 423, 523, 823‧‧‧ reflection film

24,424,5124,624,724,8424‧‧‧Light guide plate support members

24a, 424a, 5124a, 824a‧‧‧ body

24b, 424b, 5124b, 824b‧‧ ‧ feet

25, 425, 525, 825‧‧‧ frame side reflectors

26, 126, 226, 326, 426, 5126, 6226, 7326, 8426‧‧‧ diffuse reflection members

27,227,327,419,519,6219, 7319‧‧‧ Green LED light source (LED light source)

28,421, 5121, 621, 721‧‧‧LED light source substrate

28a, 421a, 521a, 621a, 721a‧‧‧ the mounting surface of the LED light source substrate

29, 627‧‧‧Light Refraction

MA‧‧‧Color mixing area

Fig. 1 is an exploded perspective view showing the schematic configuration of a television receiving apparatus according to a first embodiment of the present invention.

Fig. 2 is a plan view showing a backlight device constituting a liquid crystal display device.

Fig. 3 is a cross-sectional view taken along line A-A of Fig. 2;

Fig. 4 is a plan view showing a backlight device constituting a liquid crystal display device of Embodiment 2 of the present invention.

Fig. 5 is a cross-sectional view taken along line A-A of Fig. 4.

Fig. 6 is a cross-sectional view taken along line B-B of Fig. 4.

Fig. 7 is a graph showing the luminescence spectrum of each light source and the penetration spectrum of each colored portion of the color filter.

Fig. 8 is a plan view showing a backlight device constituting a liquid crystal display device of Embodiment 3 of the present invention.

Fig. 9 is a plan view showing a backlight device constituting a liquid crystal display device of Embodiment 4 of the present invention.

Fig. 10 is a plan view showing a backlight device constituting a liquid crystal display device of Embodiment 5 of the present invention.

Fig. 11 is a cross-sectional view taken along line A-A of Fig. 10.

Fig. 12 is a cross-sectional view taken along line B-B of Fig. 10.

Figure 13 is a plan view showing a backlight device constituting a liquid crystal display device of Embodiment 6 of the present invention.

Fig. 14 is a cross-sectional view taken along line A-A of Fig. 13.

Fig. 15 is a plan view showing a backlight device constituting a liquid crystal display device of Embodiment 7 of the present invention.

Figure 16 is a plan view showing a backlight device constituting a liquid crystal display device of Embodiment 8 of the present invention.

Figure 17 is a plan view showing a backlight device constituting a liquid crystal display device of Embodiment 9 of the present invention.

Figure 18 is a cross-sectional view taken along line A-A of Figure 17.

(Implementation type 1)

Embodiment 1 of the present invention is described with reference to Figs. 1 to 3 . In the present embodiment, the liquid crystal display device 10 and the television receiving device 10TV using the liquid crystal display device 10 are exemplified. Further, the X-axis, the Y-axis, and the Z-axis are shown as a part of each of the planes, and the respective axial directions are drawn in the directions indicated by the respective planes. Moreover, the upper side shown by FIG. 3 is a surface side, and the lower side of this figure is a back side.

As shown in FIG. 1, the television receiver 10TV of the present embodiment is configured to include a liquid crystal display device 10 having a horizontally long and slightly square shape as a whole, and the liquid crystal display device 10 is sandwiched. The way to store the back of the two cabinets 10Ca, 10Cb; the power supply 10P; the tuner (receiver) 10T receiving the television signal; and the stand 10S. As shown in FIG. 3, the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11 for displaying an image, and a backlight device (illuminating device) 12 for supplying light for display to the liquid crystal panel 11, and by a frame. A baffle 13 or the like is formed to hold the above objects in one body.

As shown in FIG. 3, the liquid crystal panel 11 is formed by bonding a pair of glass substrates with a predetermined gap therebetween, and sealing a liquid crystal layer (not shown) containing liquid crystal molecules between the two glass substrates. The liquid crystal molecule is a substance whose optical characteristics change depending on an applied electric field. On the inner surface side of one of the glass substrates (array substrate, active matrix substrate), an alignment film or the like is provided in addition to a switching element (for example, a thin film transistor TFT) and a pixel electrode which are arranged in a matrix; The switching element is connected to the source wiring and the gate wiring which are orthogonal to each other, and the pixel electrode is connected to a switching element disposed in a square region surrounded by the source wiring and the gate wiring. On the inner surface side of the other glass substrate (reverse substrate, CF substrate), each of the colored portions such as R (red), G (green), and B (blue) is arranged in a plane in a predetermined arrangement. In addition to the matrix-shaped color filter, a lattice-shaped light-shielding layer (black matrix) disposed between the respective colored portions, a counter electrode facing the pixel electrode and having a solid coating shape, an orientation film, and the like are also provided. Further, on the outer surface sides of the two glass substrates, polarizing plates are respectively provided. Further, the longitudinal direction of the liquid crystal panel 11 coincides with the X-axis direction, the short-side direction coincides with the Y-axis, and the thickness direction coincides with the Z-axis.

As shown in FIGS. 2 and 3, the backlight device 12 includes a chassis (frame) 14, an optical member (optical sheet) 15, and a frame 16; wherein the chassis 14 is slightly box-shaped and has an opening-facing surface. The light emitting portion 14b on the side (the side of the liquid crystal panel 11); the optical member 15 is in the form of a light emitting portion (opening portion) 14b disposed to cover the chassis 14, and the frame 16 supports the optical member 15 from the back side. Further, the chassis 14 includes a light source, a laser light source substrate 20, a light guide plate 22, a reflection sheet 23, and a light guide plate supporting member 24; wherein the light source refers to a red laser light source (laser light source) 17, blue a laser light source (laser light source) 18 and a green laser light source (laser light source) 19; the laser light source substrate 20 is equipped with a red laser light source 17, a blue laser light source 18, and a green laser light source The light guide plate 22 guides light from the respective laser light sources 17 to 19, and guides the light to the optical member 15 (liquid crystal panel 11). The reflection sheet 23 is laminated on the light guide plate 22. The light guide plate supporting member 24 is interposed between the reflection sheet 23 and the chassis 14, and supports the light guide plate 22 from the back side. Further, in Fig. 2, for convenience of distinction, the red laser light source 17 is represented by a straight stripe pattern, the horizontal stripe pattern represents the blue laser light source 18, and the diagonal stripe pattern represents the green laser light source 19. Further, the backlight device 12 is provided with a laser light source substrate 20 at one end portion in the short-side direction (Y-axis direction), and is derived from each of the laser light sources 17 to 19 with respect to the light guide plate 22. The light is a single-side light-in-edge type (sidelight type). Next, each constituent member of the backlight device 12 will be described in detail.

The chassis 14 is made of metal. As shown in Fig. 2 and Fig. 3, it is composed of a bottom portion 14a and a side portion 14c. The whole is a slightly box-shaped opening having an opening facing the surface side; wherein the bottom portion 14a is The liquid crystal panel 11 is also a horizontally long rectangular shape; the side portion 14c is formed by the outer ends of the respective sides of the bottom portion 14a. The chassis 14 (bottom portion 14a) has a longitudinal direction that coincides with the X-axis direction (horizontal direction) and a short-side direction that coincides with the Y-axis (vertical direction). Further, on the side portion 14c, the frame 16 and the shutter 13 can be fixed.

As shown in FIG. 3, the optical member 15 is disposed so as to cover the light emitting portion 14b of the chassis 14, and is interposed between the liquid crystal panel 11 and the light guide plate 22. In other words, the optical member 15 is disposed on the exit side of the light-emitting path with respect to each of the laser light sources 17 to 19. The optical member 15 is in the form of a sheet and has a total of three sheets. Specifically, the optical member 15 is composed of a lenticular sheet 15a, a cymbal sheet 15b, and a reflective polarizer 15c, wherein the lenticular sheet 15a imparts an isotropic light collecting effect to the light; the cymbal sheet 15b is The photo-isotropic light collecting effect is imparted; the reflective polarizing film 15c reflects the light polarized light. The optical member 15 is laminated on the back side from the lenticular sheet 15a, the cymbal sheet 15b, and the reflective polarizer 15c, and the outer edge portion is placed on the surface of the frame 16 with respect to the frame 16. side. In other words, the optical member 15 is spaced from the front surface side of the light guide plate 22, that is, the light exit side, with a space corresponding to the frame 16 (more specifically, the frame portion 16a to be described later), and the light guide plate 22 is interposed therebetween. For the relative state.

As shown in FIG. 3, the frame 16 has a frame-like portion 16a having a horizontal length, and the frame-like portion 16a extends along the outer peripheral edge portion of the light guide plate 22 and the optical member 15. The frame-like portion 16a receives the outer peripheral edge portion of the optical member 15 from the back side so as to cover the entire outer peripheral edge portion of the optical member 15, and covers the entire outer peripheral edge portion of the light guide plate 22 from the surface. The side pusher supports the outer peripheral edge portion of the light guide plate 22. A frame-side reflection sheet 25 that reflects light is attached to a surface of the back surface side of the long side portion of the frame portion 16a (the light guide plate 22 and the respective laser light sources 17 to 19). Further, the frame 16 has a liquid crystal panel supporting portion 16b that protrudes toward the front side by the frame portion 16a and supports the outer peripheral edge portion of the liquid crystal panel 11 from the back side.

The red laser light source 17 has a red semiconductor laser element that emits red laser light as shown in Figs. 2 and 3. The blue laser source 18 has a blue semiconductor laser element that emits blue laser light. The green laser source 19 has a green semiconductor laser element that emits green laser light. The laser light of each color emitted by the red laser light source 17, the blue laser light source 18, and the green laser light source 19 has the same phase and wavelength, and is the same dimming light, compared with the light emitted by the general LED light source. The laser light has a small divergence angle and is strong in straightness, and is excellent in color purity. In addition, the red laser light source 17, the blue laser light source 18, and the green laser light source 19, the surfaces on the opposite sides of the light-emitting surface of the red laser light source 17, are respectively mounted on the laser light source substrate 20, that is, the top. Surface light type.

As shown in FIGS. 2 and 3, the laser light source substrate 20 has a plate shape extending in the longitudinal direction of the chassis 14, and is attached to one of the long sides (the lower side shown in FIG. 2). Side portion 14c). The laser light source substrate 20 is preferably mounted on the lower side portion 14c of the chassis 14 in the vertical direction, whereby the laser light source substrate 20 causes the frame edge width of the liquid crystal display device 10 and the television receiving device 10TV to be only As it gets bigger, it is hard to damage its design. The laser light source substrate 20 is provided with a red laser light source 17, a blue laser light source 18, and a mounting surface 20a of the green laser light source 19, and faces one end surface of the long side of the light guide plate 22. On the mounting surface 20a of the laser light source substrate 20, 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 and will be patterned. A plurality of red laser light sources 17, blue laser light sources 18, and green laser light sources 19 are arranged along the X-axis direction in a vacant interval and repeatedly arranged.

The light guide plate 22 is made of an almost transparent synthetic resin material (for example, an acrylic resin such as PMAA or polycarbonate). As shown in FIGS. 2 and 3, the light guide plate 22 has a plate shape having a thickness larger than that of the optical member 15, and is located directly under the liquid crystal panel 11 and the optical member 15, and is housed in the chassis 14. Similarly to the optical member 15 and the like, the light guide plate 22 has a horizontally long rectangular shape in plan view. In the outer peripheral end surface of the light guide plate 22, an end surface of one of the long sides (the lower side shown in FIG. 2) has a laser light incident portion (light incident portion) 22a into which the laser light of each color is incident, and the The number and arrangement interval of the incident light portion 22a are the same as 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; wherein the laser light incident portion 22a It is a light-emitting surface facing the red laser light source 17, the blue laser light source 18, and the green laser light source 19. In the outer peripheral end surface of the light guide plate 22, the other end surface (upper side shown in FIG. 2) on the long side has a laser light incident portion (light incident opposite portion) 22e, and the laser light enters the opposite portion of the light. 22e is a portion on the opposite side of the laser light incident portion 22a. The laser light incident light-receiving portion 22e is disposed in the other end faces of the light guide plate 22 so as to be arranged at intervals along the X-axis direction, and the number and arrangement interval thereof are the same as those of the red mine. The number and arrangement intervals of the light source 17, the blue laser light source 18, and the green laser light source 19 (the laser light incident portion 22a). In the light guide plate 22, the plate surface facing the front surface of the pair of front and back plates is a light exit plate surface 22c that emits light toward the liquid crystal panel 11 and the optical member 15, and the plate surface facing the back side is set. The light emitted from the opposite side of the light plate surface 22c is opposite to the plate surface 22d. As described above, the light guide plate 22 has a function of introducing light emitted from each of the laser light sources 17 to 19 in the Y-axis direction from each of the light-introducing portions 22a, and causing the light to propagate internally and along the z The emission in the axial direction is emitted from the light-emitting plate surface 22c toward the optical member 15 side (surface side, light emission side).

As shown in FIG. 3, the reflection sheet 23 is disposed so as to cover the light-emitting opposite surface 22d of the light guide plate 22. The reflection sheet 23 is excellent in light reflectivity, and can efficiently emit light leaking from the light-emitting opposite plate surface 22d of the light guide plate 22 toward the surface side (light-emitting plate surface 22c). The reflection sheet 23 has an outer shape that is slightly larger than the light guide plate 22, and both end portions on the long side thereof are arranged to be further to the respective laser light sources 17 to the laser light incident portion 22a of the light guide plate 22. 19 side protruding forms.

The light guide plate supporting member 24 is made of a synthetic resin, and has a pair as shown in FIG. 3, and supports both end portions of the long side of the light guide plate 22 from the back side. The light guide plate supporting member 24 is disposed between the bottom portion 14a of the chassis 14 and the reflection sheet 23, and is configured to lift the light guide plate 22 from the bottom portion 14a without being directly in contact with the bottom portion 14a. The light guide plate 22 is supported in the form. Thereby, the positional relationship between the respective laser light sources 17 to 19 and the light guide plate 22 in the Z-axis direction can be stably maintained, and in addition, even if the heat generated by the respective laser light sources 17 to 19 is generated, The laser light source substrate 20 is transmitted to the chassis 14, but becomes difficult to be transmitted from the chassis 14 to the light guide plate 22. The light guide plate supporting member 24 is formed by the main body portion 24a and the pair of leg portions 24b extending along the longitudinal direction of the light guide plate 22 and the reflection sheet 23, and directly facing the reflection sheet 23. The leg portion 24b is protruded from the both end portions of the main body 24a in the Y-axis direction toward the back side, and is in contact with the bottom portion 14a of the chassis 14.

As shown in FIGS. 2 and 3, the backlight device 12 of the present embodiment has a diffuse reflection member 26 for diffusing and reflecting the respective types of laser light propagating inside the light guide plate 22. The surface of the diffuse reflection member 26 is made of white synthetic resin (for example, PCT resin) which exhibits excellent light reflectivity, and the other side (upper side shown in FIG. 2) on the long side of the outer peripheral end surface of the light guide plate 22 On the end surface, the diffuse reflection member 26 is mounted in a form that is at least in direct contact with and in contact with the laser incident light opposite portion 22e. The diffuse reflection member 26 is attached to the other end surface (including the laser light incident portion 22e) of the light guide plate 22 by using an almost transparent adhesive or a double-sided tape, so that the two are integrated.

With such an aspect, the red laser light, the blue laser light source 18, and the green laser light source 19 emit red laser light, blue laser light, and green laser light, which are incident on the light guide plate 22. When the laser light enters the light-incident portion 22a, it enters the light guide plate 22 straightly, and reaches the laser incident light opposite portion 22e on the opposite side of the laser light incident portion 22a. The red laser light, the blue laser light, and the green laser light that have arrived at the laser light incident portion 22e are diffused and reflected by the diffuse reflection member 26, and are diffused in the light guide plate 22 and travel toward the laser light incident portion 22a side. Then, it is emitted from the light exiting plate surface 22c. In this way, 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 can be emitted as red, blue, and green. The diffused light is similar to a red diffused light source, a blue diffused light source, and a green diffused light source, and the red, blue, and green diffused light has a divergence angle equal to or greater than that of a general LED light source. Therefore, the red light, the blue light, and the green light diffused and reflected by the diffuse reflection member 26 are well mixed together in the light guide plate 22, and the white light having no unevenness is emitted from the light exit plate surface 22c. Both brightness uniformity and chromaticity uniformity are high. In particular, since the diffuse reflection member 26 is attached to the portion opposite to the laser light incident portion 22e of the light guide plate 22, light is less likely to leak from between the laser light incident portion 22e and the diffuse reflection member 26. Thereby, the utilization efficiency of light is excellent. Further, since the light guide bar is used individually for each light source in the past, since the light guide plate 22 is used in this aspect, it is preferable to reduce the number of parts. In addition, the white balance of the image displayed by the liquid crystal panel 11 can be adjusted by adjusting the outputs of the red laser light source 17, the blue laser light source 18, and the green laser light source 19 without adjusting the liquid crystal panel 11. The Y value of each pixel in R, G, and B.

In addition, as shown in FIG. 2, the diffuse reflection member 26 is disposed over the entire length/full area of the other end surface of the outer peripheral end surface of the light guide plate 22 having the laser light incident portion 22e. In other words, in the other end surface of the light guide plate 22 described above, the plurality of laser light incident portions 22e arranged at regular intervals in the X-axis direction are opposite to the laser light incident portion 22e. Adjacent parts are also mounted in a facing and connected manner. In this way, regardless of the positional relationship of the diffuse reflection members 26 with respect to the red, blue, and green laser light sources 17 to 19 in the X-axis direction, the laser light of each color can be diffused and reflected, and therefore, the laser light of each color The reliability of diffusion reflection by the diffuse reflection member 26 is high. Further, at the time of assembly, it is not necessary to align the diffuse reflection members 26 with the laser light sources 17 to 19 of the respective colors in the X-axis direction, which is easy to manufacture.

The backlight device (illuminating device) 12 of the present embodiment as described above is provided with a laser light source, a light guide plate 22, and a diffuse reflection member 26; wherein the laser light source is a red laser light source 17 that emits laser light, blue a color laser light source 18, a green laser light source 19; the light guide plate 22, a portion of the outer peripheral end surface facing the laser light source, that is, a pair of red laser light source 17, a blue laser light source 18, and a green laser light source 19 The portion of the outer peripheral end surface that is opposite to the light incident portion 22a is a portion that is opposite to the light incident light portion (opposite light entrance portion) 22e. And one of the pair of plate faces is a light-emitting plate surface 22c that emits light; the diffuse reflection member 26 is attached to the light-introducing portion 22e of the light guide plate 22, and diffuses and reflects the light. Light

With such an aspect, the laser light emitted from the laser light source, that is, the red laser light source 17, the blue laser light source 18, and the green laser light source 19, is incident on the laser light incident portion 22a of the light guide plate 22. And in the form of a straight forward in the light guide plate 22, the laser beam is incident on the opposite portion 22e. The laser light reaching the laser light incident opposite portion 22e is diffused and reflected by the diffuse reflection member 26, and the diffuse reflection member 26 is mounted in contact with the laser incident light opposite portion 22e, whereby the laser light is received After diffusing in the light guide plate 22 and traveling toward the laser light incident portion 22a, the light exits from the light exit plate surface 22c. Therefore, in the plane of the light-emitting plate surface 220, the brightness of the emitted light is uniform. In addition, compared to the conventional use of the rod-shaped light guiding portions for each of the laser light sources, that is, the red laser light source 17, the blue laser light source 18, and the green laser light source 19, since this aspect is Since the light guide plate 22 is used, it is preferable to reduce the number of parts. Further, since the diffuse reflection member 26 is attached to the portion opposite to the laser light incident portion 22e of the light guide plate 22, the light becomes difficult to leak between the laser light incident portion 22e and the diffusion reflection member 26. Thereby, the utilization efficiency of light is excellent.

In addition, the laser light source comprises a red laser light source 17 emitting red laser light, a green laser light source 19 emitting green laser light, a blue laser light source 18 emitting blue laser light, and a red laser light source 17, green thunder The light source 19 and the blue laser light source 18 are arranged in an in-line shape, and the diffuse reflection member 26 is disposed over the entire surface of the outer peripheral end surface of the light guide plate 22 having the end face of the laser light incident portion 22e. In this way, the laser light of each color emitted by the red laser light source 17, the green laser light source 19, and the blue laser light source 18 arranged in an in-line form is incident on the laser light incident portion 22a of the light guide plate 22. At the same time, the light guide plate 22 is directed straight toward the laser incident light opposite portion 22e, and is diffused and reflected by the diffuse reflection member 26, wherein the diffuse reflection member 26 is disposed to be in contact with the laser incident light opposite portion 22e. form. In this way, the light of each color is well mixed in the light guide plate 22, and is emitted as white light from the light exit plate surface 22c. The diffuse reflection member 26 is disposed over the entire outer peripheral end surface of the light guide plate 22 having the end face of the laser light incident portion 22e. Therefore, regardless of the positional relationship of the diffuse reflection member 26 with respect to the laser light sources 17 to 19 of the respective colors, It can diffuse and reflect various colors of laser light. Therefore, the laser light of each color is highly diffused and reflected by the diffuse reflection member 26 with high reliability.

Further, the liquid crystal display device (display device) 10 of the present embodiment includes the above-described backlight device 12 and a liquid crystal panel (display panel) 11 that displays an image with light irradiated by the backlight device 12. With such a liquid crystal display device 10, the number of parts of the backlight device 12 is reduced, and the light use efficiency of the backlight device 12 is excellent, so that the manufacturing cost can be reduced, and low power consumption or high brightness can be expected. Therefore, it is better.

Further, the television receiver 10TV of the present embodiment includes the above-described liquid crystal display device 10. With such a television receiving device 10TV, as the manufacturing cost of the display device 10 is lowered, the display quality can be excellent, and therefore, the TV image having excellent display quality can be obtained while having an advantage in price competitiveness. The display is implemented.

(implementation type 2)

Embodiment 2 of the present invention will be described with reference to Figs. 4 to 7 . This embodiment 2 shows the use of the green LED light source 27 instead of the green laser light source of the above-described embodiment 1. Incidentally, the same structures, operations, and effects as those of the above-described embodiment 1 are omitted in order to avoid redundancy.

In the backlight device 112 of 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. Further, in Fig. 4, for convenience of distinction, the green LED light source 27 is represented by a pattern of diagonal stripes. The green LED light source 27 is mounted on the LED light source substrate 28, and the LED light source substrate 28 is different from the laser light source substrate 120 in which the red laser light source 117 and the blue laser light source 118 are disposed. The LED light source substrate 28 having the green LED light source 27 is disposed in the Y-axis direction so as to sandwich the light guide plate 122 between the LED light source substrate 28 and the laser light source substrate 120. Therefore, in the backlight device 112, the LED light source substrate 28 is disposed at one of the ends in the short-side direction, and the laser light source substrate 120 is disposed on the other end portion with respect to the light guide plate 122. The light from each of the light sources 27, 117, and 118 is a side light type (side light type) which is light-introduced on both sides and is light-introduced on both sides.

As shown in FIGS. 4 and 5, the laser light source substrate 120 is a side portion 114c attached to the other (upper side shown in FIG. 4) on the long side of the chassis 114. On the mounting surface 120a of the laser light source substrate 120, a plurality of red laser light sources 117 and blue laser light sources 118 are arranged in an X-axis direction at intervals and alternately arranged. In detail, a plurality of red laser light sources 117 and blue laser light sources 118 have two types of spaces between adjacent light sources, and are arranged at a relatively narrow interval to form a group. Therefore, the interval between the red laser light source 117 and the blue laser light source 118 constituting different groups 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. 4 and 6. The green light emitted by the green LED light source 27 is a non-coherent light, and the divergence angle of the green light is large and the straightness is weak compared to the laser light of each color emitted by the red laser light source 117 and the blue laser light source 118. Moreover, compared with a general green laser light source, the green LED light source 27 has an excellent luminous efficiency of about 2 times, so that high luminance can be obtained with low power consumption. Further, the green LED light source 27, the surface on the opposite side of the light-emitting surface itself, is mounted on the LED light source substrate 28, that is, the top surface light-emitting type.

As shown in FIGS. 4 and 6 , the LED light source substrate 28 has a plate shape extending in the longitudinal direction of the chassis 114 and is attached to one of the long sides (the lower side shown in FIG. 4 ). Side portion 114c. The LED light source substrate 28 is provided with a mounting surface 28a of the green LED light source 27, and is an end surface facing one of the long sides of the light guide plate 122. On the mounting surface 28a of the LED light source substrate 28, a wiring pattern (not shown) for supplying power to the green LED light source 27 is patterned, and a plurality of green LED light sources 27 are vacated along the X-axis direction. Arranged in a spaced arrangement. In detail, the plurality of green LED light sources 27 have an interval between adjacent light sources, which is larger than the arrangement range of the red laser light source 117 and the blue laser light source 118 constituting the same group in the X-axis direction. broad. Further, the plurality of green LED light sources 27, and the red laser light source 117 and the blue laser light source 118 are arranged in an offset configuration (not arranged neatly) in the X-axis direction.

As shown in FIG. 4, the light guide plate 122 has the other end face (the upper side shown in FIG. 4) on the long side of the outer peripheral end surface, and each of the red laser light source 117 and the blue laser light source 118 is illuminated. And a laser light incident portion 122a having laser light of various colors, and the number and arrangement interval of the laser light incident portion 122a are the same as those of the red laser light source 117 and the blue laser light source 118. Number and configuration interval between groups. The formation range of the laser light incident portion 122a in the X-axis direction is almost the same as the arrangement range of the red laser light source 117 and the blue laser light source 118 constituting one set. The end surface of one of the long side sides (the lower side shown in FIG. 4) of the outer peripheral end surface of the light guide plate 122 is an LED that faces (positively faces) the light emitting surface of the green LED light source 27 and has green light. In the light incident portion 22b, the number and arrangement interval of the LED light incident portion 22b are the same as the number and arrangement interval of the green LED light source 27. The formation range of the LED light-incident portion 22b in the X-axis direction is larger than the portion facing the green LED light source 27 in the one end surface of the above-described one of the end portions (the arrangement range of the green LED light source 27 in the left-right direction). ) is wider. The reason is that the green light emitted by the green LED light source 27 has a divergence angle larger than the divergence angle of each of the laser light sources 117 and 118. The one end surface of the light guide plate 122 having the long side of the LED light incident portion 22b has a portion opposite to the laser light incident portion 122e located on the opposite side of the laser light incident portion 122a. The laser light incident light-receiving portion 122e is disposed on the one end surface of the light guide plate 122 on the one end surface of the light guide plate 122 in the X-axis direction, and is arranged in an alternating manner, and the number and arrangement interval thereof are arranged. It is the same as the set number of the red laser light source 117 and the blue laser light source 118 and the arrangement interval between the groups.

Here, the main light emission wavelength and the light emission spectrum of each of the light sources 27, 117, and 118 included in the backlight device 12 will be described in detail using FIG. Fig. 7 is a view showing the light emission spectrum of each of the light sources 27, 117, and 118. The horizontal axis of the figure is the wavelength (the unit is "nm"), and the vertical axis on the left side of the figure is the luminous intensity (the unit is "W/nm"). . Further, in Fig. 7, the light emission spectrum of the red laser light source 117 is indicated by a thin broken line, and the light emission spectrum of the blue laser light source 118 is indicated by a thin two-dot chain line, which is represented by a thin chain line. The luminescence spectrum of the green LED light source 27. The red laser light source 117 emits red laser light having a main emission wavelength of 630 nm and a half-value width (full width at half maximum) of 2 nm. The blue laser light source 118 emits blue laser light having a main emission wavelength of 441 nm and a half value width of 2 nm. The blue laser light source 118 has a luminous intensity (0.055 W/nm) of the main emission wavelength, which is greater than the luminous intensity (0.037 W/nm) of the red laser light source 117. The green LED light source 27 emits green light having a main emission wavelength of about 534 nm and a half-value width of about 18 nm. The green LED light source 27 has a luminous intensity (0.0018 W/nm) of the main emission wavelength, which is much smaller than the respective luminous intensities of the red laser light source 117 and the blue laser light source 118, and the half-value width of the emission spectrum thereof. It is much larger than the half value 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 by the red laser light source 117 and the blue laser light emitted from the blue laser light source 118 have almost no interference in the wavelength range, and even for the green LED light source. The green light emitted by 27 has a wavelength range of almost no interference. Therefore, the illumination light of the backlight device 112 has a very high color purity of each color. Moreover, the green LED light source 27 has a good luminous efficiency compared to a general green laser light source that emits green laser light, so that high luminance can be obtained with low power consumption. Further, the respective light emission spectra of the above-described red laser light source 117 and blue laser light source 118 are the same even in the aspect described in the above-described first embodiment.

Next, the penetration spectrum of each colored portion in the color filter provided in the liquid crystal panel 111 will be described in detail using FIG. Fig. 7 is a view showing the transmission spectrum of each colored portion, and the horizontal axis of the figure is the wavelength (the unit is "nm"), and the vertical axis on the right side of the figure is the spectral transmittance (the unit is "%"). In addition, in FIG. 7, the penetration spectrum of the red colored portion is indicated by a thick broken line, the penetration spectrum of the blue colored portion is indicated by a thick two-dot chain line, and the green colored portion is indicated by a thick dotted line. Penetration spectrum. The red colored portion is red, which selectively penetrates the red wavelength region (about 600 nm to 780 nm), that is, the red light, and the wavelength of the peak included in the transmission spectrum corresponds to a wavelength of 595 nm. the above. The "wavelength corresponding to the peak half value" refers to a wavelength corresponding to a half value of the value (maximum value) of the spectral transmittance of the peak wavelength (634 nm) of the transmission spectrum. a blue colored portion that selectively diffuses light in the blue wavelength region (about 420 nm to 500 nm), that is, blue light, and has a peak wavelength of 468 nm in the transmission spectrum. The half value width of the peak is about 90 nm. The green-green colored portion is selectively formed by penetrating light of a green wavelength region (about 500 nm to 570 nm), that is, green light, and the breakthrough spectrum includes a peak wavelength of 522 nm and a half of the peak. The value width is approximately 96 nm. In the green colored portion, the penetration spectrum partially overlaps 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. In other words, in the transmitted light of the green colored portion, it tends to contain more blue light than the red light. Further, the respective transmission spectra of the respective colored portions of the above-described color filter are the same even in the aspect described in the above-described embodiment 1.

As shown in FIG. 4, the diffuse reflection member 126 of the present embodiment is disposed on the end surface of one of the long sides of the light guide plate 122 (the lower side shown in FIG. 4) in the X-axis direction. A form adjacent to the LED light incident portion 22b. In detail, the diffuse reflection member 126 is disposed on the one end surface of the light guide plate 122 on the one end surface of the light guide plate 122 and the LED light incident portion 22b in the X-axis direction, and is arranged in an alternating manner, and the number and arrangement interval thereof are arranged. It is the same number and arrangement interval as the laser light incident opposite portion 122e (the number of sets of the red laser light source 117 and the blue laser light source 118, and the arrangement interval between the groups). According to this aspect, the light that enters the LED light-injecting portion 22b by the green LED light source 27 is not hindered, and the laser light entering the light-receiving portion 122e can be irradiated into the light-receiving portion 122e. The laser light of each color that travels is diffused and reflected well by the diffuse reflection member 126.

The diffuse reflection member 126 and the laser incident light opposite portion 122e, as shown in Fig. 4, form a range in the X-axis direction with the red laser light source 117 and the blue laser light source 118 constituting one set on the X-axis. The configuration range in the direction is almost equal. That is, the diffuse reflection member 126 is formed to span a red laser light source 117 and a blue laser light source 118 that constitute a group. With such an aspect, in contrast to the case where the diffuse reflection members are disposed to individually correspond to the red laser light source 117 and the blue laser light source 118 constituting one set, the present aspect can be efficiently utilized by the diffuse reflection member 126. The red laser light and the blue laser light are scattered and reflected, and the arrangement of the diffuse reflection member 126 becomes easy.

According to the embodiment described above, the LED light source, that is, the green LED light source 27, and the LED light source substrate 28 are provided. The LED light source substrate 28 is configured to be equipped with an LED light source, that is, a green LED light source 27, and faces the opposite portion of the laser light incident. 122e; the light guide plate 122, wherein at least a part of the outer peripheral end surface facing the LED light source, that is, the green LED light source 27 is an LED light-input portion 22b into which the light of the green LED light source 27 is incident; the diffuse reflection member 126 is disposed. Formed adjacent to the LED light incident portion 22b. As a result, the light emitted from the LED light source, that is, the green LED light source 27, enters the LED light-injecting portion 22b of the light guide plate 122, propagates through the light guide plate 122, and is then emitted from the light-emitting plate surface 122c. The diffuse reflection member 126 is disposed adjacent to the LED light incident portion 22b so as not to interfere with the light incident on the LED light incident portion 22b by the LED light source, that is, the green LED light source 27, and can be placed in the light guide plate 122. The laser light traveling toward the laser light incident portion 122e on the side of the laser light incident portion 122a is diffused and reflected well.

Further, 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. In contrast, the LED light source includes a green LED light source 27 that emits green light. In this way, the diffuse reflection member 126 diffuses and reflects the red laser light and the blue laser light emitted by the red laser light source 117 and the blue laser light source 118, and can be used as a pseudo-red diffusion light source for emitting diffused light and Since the blue diffused light source functions, the red light and the blue light diffused and reflected by the diffuse reflection member 126 are combined with the green light emitted from the green LED light source 27 and incident on the LED light incident portion 22b on the light guide plate 122. The inside is well mixed, and is emitted as white light from the light exit surface 122c. The red laser light emitted by the red laser light source 117 and the blue laser light emitted by the blue laser light source 118 have almost no interference in the wavelength range, and even if the green LED light source 27 emits Green light, its wavelength range is also almost no interference. Therefore, the color purity of each color will be very high. Moreover, the green LED light source 27 has a good luminous efficiency compared to the green laser light source that emits green laser light, so that high luminance can be obtained with low power consumption.

Further, the red laser light source 117 and the blue laser light source 118 are disposed in a form adjacent to each other; the diffuse reflection member 126 is formed to span the red laser light source 117 and the blue laser light source 118. In this way, by forming the red laser light source 117 adjacent to each other and the diffuse reflection member 126 of the blue laser light source 118, the red laser light and the blue laser light can be efficiently scattered and reflected.

(Implementation type 3)

Embodiment 3 of the present invention is described in Fig. 8. This embodiment 3 shows a configuration in which the above-described embodiment 2 is changed to the structure of the laser light incident portion 222a and the LED light incident portion 222b. Incidentally, the same structures, operations, and effects as those of the above-described embodiment 2 are omitted in order to avoid redundancy.

In the light guide plate 222 of the present embodiment, as shown in Fig. 8, a light refraction portion 29 is provided on each of the outer peripheral end faces of the laser light incident portion 222a and the LED light incident portion 222b. The light refracting portion 29 is formed by performing uneven processing on each surface of the laser light incident portion 222a and the LED light incident portion 222b, and the cross-sectional shape thereof is prismatic. The light refracting portion 29 imparts laser light incident from the respective laser light sources 217 and 218 to the laser light incident portion 222a or green light incident from the green LED light source 227 to the LED light incident portion 222b. The refraction that causes the divergence angles to expand. Each of the lights that are refracted by the light refracting portion 29 travels in the light guide plate 222 in the Y-axis direction away from the respective light-incident portions 222a and 222b (for example, by the laser light incident portion 222a side). The light is incident on the opposite portion 222e of the light incident light, and during the traveling thereof, the light is diverged in the X-axis direction, and the light distribution range is gradually enlarged. In particular, each of the laser beams expands the light distribution range by the light refracting portion 29, and when it reaches the laser light incident portion 222e, it is irradiated onto the diffuse reflection member 226 in a wider range, and is diffused and reflected. The diffusion range of the diffused reflected light via the diffuse reflection member 226 becomes wider. Thereby, in the surface of the light-emitting plate surface 222c of the light guide plate 222, the brightness uniformity of the emitted light becomes higher. Further, on the end surface of one of the long sides of the light guide plate 222 (the lower side shown in FIG. 8), the light refracting portion 29 is provided over the entire area of each of the LED light incident portions 222b, that is, each of the laser beams. Since the plurality of diffuse reflection members 226 are attached to the light guide plate 222, when the plurality of diffuse reflection members 226 are attached to the light guide plate 222, the respective diffused reflection members 226 are attached to the respective light refraction portions 29 of the one end surface. It can be formed on the part. In other words, each of the light-refracting portions 29 can function as a mark when each of the diffuse reflection members 226 is attached, and the assembly workability is good.

According to the above-described embodiment, at least the laser light incident portion 222a of the outer peripheral end surface of the light guide plate 222 is such that the light distribution range of the laser light incident on the laser light incident portion 222a is increased by the laser light incident portion. The light refracting portion 29 that imparts a refractive power to the laser light is provided on the side of the 222a side so that the laser light incident opposite portion 222e is enlarged. Thus, the laser light emitted from the laser light source 217 and the blue laser light source 218, which is emitted from the laser light source 222a, is polarized by the light refracting portion 29. The laser light to which the refractive effect is applied travels from the side of the laser light incident portion 222a toward the laser light incident portion 222e in the light guide plate 222, and the light distribution range is enlarged during the traveling. Therefore, the laser light that has reached the laser light incident portion 222e is irradiated onto the diffuse reflection member 226 in a wider range and is diffused and reflected. Therefore, the diffusion range of the diffused reflection light passing through the diffusion reflection member 226 becomes More broad. Thereby, the brightness uniformity of the emitted light becomes higher in the plane of the light-emitting plate surface 222c.

(Implementation type 4)

Embodiment 4 of the present invention is described in Fig. 9. This embodiment 4 shows an arrangement in which the above-described embodiment 2 is changed to the arrangement of the red laser light source 317 and the blue laser light source 318. Incidentally, the same structures, operations, and effects as those of the above-described embodiment 2 are omitted in order to avoid redundancy.

The red laser light source 317 and the blue laser light source 318 of the present embodiment, as shown in Fig. 9, are configured such that light sources constituting one group are arranged close to each other. That is, between the red laser light source 317 and the blue laser light source 318 which constitute one set, there is almost no gap in the X-axis direction. Therefore, the laser light incident portion 322a that receives the light from the red laser light source 317 and the blue laser light source 318 constituting the same group is continuously extended. Thereby, the arrangement range of the red laser light source 317 and the blue laser light source 318 in the X-axis direction is narrowed, and accordingly, the formation range of the diffuse reflection member 326 can be reduced. In such an aspect, the red laser light source 317 and the blue laser light source 318 are emitted, and the red laser light and the blue laser light diffused and reflected by the diffuse reflection member 326 in the light guide plate 322 are compared with In the above-described embodiment 1, the red laser light and the blue laser light of the present aspect or the green light emitted by the green LED light source 327 may become difficult to mix. Therefore, in the light guide plate 322, at the end portions on the side of the green LED light source 327 and the diffuse reflection member 326, a color mixing region for mixing red laser light, blue laser light, and green light is set (in comparison with FIG. 9). The area of the lower side of the chain is shown as the lower side) MA.

(implementation type 5)

Embodiment 5 of the present invention is described with reference to Figs. 10 to 12 . Similarly to the first embodiment, in the fifth embodiment, the liquid crystal display device 410 used in the television receiving device will be described, and the liquid crystal display device 410, as shown in FIG. 11, has a liquid crystal panel (display panel) for displaying an image. 411. A backlight device (illuminating device) 412 for supplying light for display to the liquid crystal panel 411, and holding the above-mentioned objects integrally by a frame-shaped baffle 413 or the like. Further, the liquid crystal panel 411 has the same structure as that of the first embodiment.

On the other hand, as shown in FIGS. 10 and 11, the backlight device 412 includes a chassis (frame) 414, an optical member (optical sheet) 415, and a frame 416; wherein the chassis 414 is slightly box-shaped and The light emitting portion 414b having the opening toward the surface side (the liquid crystal panel 411 side); the optical member 415 is in the form of a light emitting portion (opening portion) 414b disposed to cover the chassis 414; the frame 416 is supported by the back side supporting optical member 415 . Further, the chassis 414 includes a light source, a laser light source substrate 420, an LED light source substrate 421, a light guide plate 422, a reflection sheet 423, and a light guide plate supporting member 424; wherein the light source refers to 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; the laser light source substrate 420 is equipped with a red laser light source 417 and a blue laser light source 418; the LED light source The substrate 421 is provided with a green LED light source 419; the light guide plate 422 guides light from the light sources 417 to 419, and directs the light to the optical member 415 (liquid crystal panel 411); the reflective sheet 423 is laminated The light guide plate supporting member 424 is disposed between the reflection sheet 423 and the chassis 414, and supports the light guide plate 422 from the back side. In addition, in FIG. 10, for convenience of distinction, the red laser light source 417 is represented by a straight stripe pattern, the horizontal stripe pattern represents a blue laser light source 418, and the diagonal stripe pattern represents a green LED light source 419. Further, the backlight device 412 is provided with a laser light source substrate 420 and an LED light source substrate 421 at both end portions in the short-side direction (Y-axis direction), and is derived from each of the light sources 417 with respect to the light guide plate 422. The light of 419 is light-emitting type (side light type) that is light-in between the two sides. Next, each constituent member of the backlight device 412 will be described in detail.

The red laser light source 417 has a red semiconductor laser element that emits red laser light as shown in Figs. 10 and 11. The blue laser source 418 has a blue semiconductor laser element that emits blue laser light. The laser light of each color emitted by the red laser light source 417 and the blue laser light source 418 has the same phase and wavelength, and is the same dimming light. Compared with the green light emitted by the green LED light source 419, which will be described later, the light is emitted. The divergence angle of the light is small and the straightness is strong. Moreover, the laser light of each color emitted by the red laser light source 417 and the blue laser light source 418 is superior in color purity as compared with the color light emitted by the general red LED light source or the blue LED light source. Further, the red laser light source 417 and the blue laser light source 418, the surfaces on the opposite sides of the light-emitting surface itself, are respectively mounted on the laser light source substrate 420, that is, the top surface light-emitting type.

As shown in FIGS. 10 and 11 , the laser light source substrate 420 has a plate shape extending in the longitudinal direction of the chassis 414 and is attached to one of the long sides (the upper side shown in FIG. 10 ). Side 414c. The laser light source substrate 420 has a mounting surface 420a which is an end surface facing one of the long sides of the light guide plate 422, and the mounting surface 420a is provided with a red laser light source 417 and a blue laser light source 418. On the mounting surface 420a of the laser light source substrate 420, a wiring pattern (not shown) for supplying power to the red laser light source 417 and the blue laser light source 418 is patterned, and a plurality of red laser light sources 417 are formed. And the blue laser light source 418 is arranged along the X-axis direction in an vacant interval and alternately arranged. In detail, a plurality of red laser light sources 417 and blue laser light sources 418 have two types of spaces between adjacent light sources, and are arranged at a relatively narrow interval to form a group. Therefore, the interval between the red laser light source 417 and the blue laser light source 418 constituting different groups is relatively wide.

The green LED light source 419 has a green semiconductor element (green LED element) that emits green light as shown in FIGS. 10 and 12. The green light emitted by the green LED light source 419 is a non-coherent light, and the divergence angle of the green light is large and the straightness is weak compared to the laser light of each color emitted by the red laser light source 417 and the blue laser light source 418. Moreover, compared with a general green laser light source, the green LED light source 419 has an excellent luminous efficiency of about 2 times, so that high luminance can be obtained with low power consumption. Further, the green LED light source 419, the surface on the opposite side of the light-emitting surface itself, is mounted on the LED light source substrate 421 described below, that is, the top surface light-emitting type.

As shown in FIGS. 10 and 12, the LED light source substrate 421 has a plate shape extending in the longitudinal direction of the chassis 414, and is attached to the other side (the lower side shown in FIG. 10) on the long side. Side 414c. The LED light source substrate 421 is provided with a mounting surface 421a of the green LED light source 419, and is the other end surface facing the long side of the light guide plate 422. On the mounting surface 421a of the LED light source substrate 421, a wiring pattern (not shown) for supplying power to the green LED light source 419 is patterned, and a plurality of green LED light sources 419 are vacated along the X-axis direction. Arranged in a spaced arrangement. In detail, the plurality of green LED light sources 419 have an interval between adjacent light sources compared to the arrangement range of the red laser light source 417 and the blue laser light source 418 constituting the same group in the X-axis direction. broad. Further, the plurality of green LED light sources 419, and the red laser light source 417 and the blue laser light source 418 are arranged in an offset configuration (not arranged neatly) in the X-axis direction.

As shown in FIG. 10, the light guide plate 422 has a horizontally long rectangular shape in plan view, similarly to the optical member 415 and the like. An end surface of one of the long sides of the outer peripheral end surface of the light guide plate 422 (upper side shown in FIG. 10) is a light emitting surface facing the red laser light source 417 and the blue laser light source 418, and has laser light of each color. The laser light incident portion (light incident portion) 422a is inserted, and the number and arrangement interval of the laser light incident portion 422a are the same as the number of sets of the red laser light source 417 and the blue laser light source 418. The configuration interval between groups. The formation range of the laser light incident portion 422a in the X-axis direction is almost the same as the arrangement range of the red laser light source 417 and the blue laser light source 418 constituting one set. The light guide plate 422 has an end surface on the other side (the lower side shown in FIG. 10) on the long side of the outer peripheral end surface, which is an LED that faces (positively faces) the light emitting surface of the green LED light source 419 and has green light. In the light incident portion 422b, the number and arrangement interval of the LED light incident portion 422b are the same as the number and arrangement interval of the green LED light 419. The formation range of the LED light incident portion 422b in the X-axis direction is larger than the portion facing the green LED light source 419 in the other end face, in the left-right direction (the arrangement range of the green LED light source 419) ) is wider. The reason is that the green light emitted by the green LED light source 419 has a divergence angle greater than the divergence angle of each of the laser light sources 417, 418. Further, the outer peripheral end surface of the light guide plate 422 has the other end surface on the long side of the LED light incident portion 422b, and has a laser light incident portion 422e, and the laser light incident light portion 422e is located at the laser light incident portion 422a. The opposite side of the section. The laser light incident light-receiving portion 422e is disposed on the other end surface of the light guide plate 422 on the other end surface of the light guide plate 422, and is arranged in an X-axis direction along the X-axis direction, and the number thereof is arranged and arranged. It is the same number of setting groups as the red laser light source 417 and the blue laser light source 418, and the arrangement interval between the groups. As shown in FIGS. 11 and 12, the light guide plate 422 has a plate surface facing the front side of the pair of front and back plates, and is a light-emitting plate surface that emits light toward the liquid crystal panel 411 and the optical member 415. 422c, the plate surface facing the back side is the light-emitting opposite plate surface 422d on the opposite side of the light-emitting plate surface 422c. According to the above, the light guide plate 422 has a function of introducing light emitted from the respective light sources 417 to 419 in the Y-axis direction from the respective light-introducing portions 422a and 422b, and causing the light to propagate internally and along the z-axis. The direction emission is emitted from the light-emitting plate surface 422c toward the optical member 415 side (surface side, light emission side).

The reflection sheet 423, as shown in Fig. 11, is arranged to cover the light-emitting opposite plate surface 422d of the light guide plate 422. The reflection sheet 423 is excellent in light reflectivity, and can efficiently emit light leaking from the light-emitting opposite plate surface 422d of the light guide plate 422 toward the surface side (light-emitting plate surface 422c). The reflection sheet 423 has an outer shape that is slightly larger than the light guide plate 422, and both end portions on the long side thereof are arranged to be respectively directed to the respective light sources 417 as compared with the respective light incident portions 422a and 422b of the light guide plate 422. ~419 side protruding form.

The light guide plate supporting member 424 is made of synthetic resin and has a pair of both sides as shown in FIGS. 11 and 12, and supports both end portions on the long side of the light guide plate 422 from the back side. The light guide plate supporting member 424 is disposed between the bottom portion 414a of the chassis 414 and the reflection sheet 423, and is configured to lift the light guide plate 422 from the bottom portion 414a without directly contacting the bottom portion 414a. The light guide plate 422 is supported in the form. Thereby, 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, even if the heat generated by the light emission of each of the light sources 417 to 419 is generated, each substrate is used. 420, 421 are communicated to the chassis 414, but become difficult to communicate from the chassis 414 to the light guide plate 422. The light guide plate supporting member 424 is formed by the main body portion 424a and the pair of leg portions 424b extending along the longitudinal direction of the light guide plate 422 and the reflection sheet 423, and directly facing the reflection sheet 423. The leg portion 424b protrudes from the both end portions of the main body portion 424a in the Y-axis direction toward the back side, and is in contact with the bottom portion 414a of the chassis 414.

Here, the main light emission wavelength and the light emission spectrum of each of the light sources 417 to 419 included in the backlight device 412 are the same as those of the second embodiment, as shown in FIG. In addition, the transmission spectrum of each colored portion of the color filter provided in the liquid crystal panel 411 is also the same as that of the embodiment 2, as shown in FIG.

Further, the backlight device 412 of the present embodiment has a diffuse reflection member 426 as shown in FIGS. 10 and 11, and the diffuse reflection member 426 is used for diffusing reflection of laser light of various colors propagating in the light guide plate 422. . The diffuse reflection member 426 has a surface made of a white synthetic resin (for example, PCT resin) exhibiting excellent light reflectivity, and is disposed in a form facing the laser incident light opposite portion 422e, wherein the laser incident light opposite portion 422e is The outer peripheral end surface of the light guide plate 422 faces the other end surface (the lower side shown in FIG. 10) on the long side of the LED light source substrate 421. The diffuse reflection member 426 is disposed on the other end surface of the light guide plate 422 on the other end surface of the light guide plate 422 along the X-axis direction, and is arranged in an alternating manner. The number and arrangement interval are the same. The number and arrangement interval of the laser light incident opposite portions 422e (the number of sets of the red laser light source 417 and the blue laser light source 418 and the arrangement interval between the groups). Further, the diffusion reflection member 426 is integrally provided on the LED light source substrate 421 and 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.

With such an aspect, the red laser light and the blue laser light emitted by the red laser light source 417 and the blue laser light source 418 are incident on the light guide plate when incident on the light incident portion 422a of the light guide plate 422. The inside of 422 is straight forward, and reaches the laser incident light opposite portion 422e on the opposite side of the laser light incident portion 422a. The red laser light and the blue laser light that have arrived at the laser light incident opposite portion 422e are diffused and reflected by the diffuse reflection member 426, diffused in the light guide plate 422, and travel toward the laser light incident portion 422a side, and then The light plate surface 422c is emitted. In this way, the diffuse reflection member 426 disposed on the same side as the green LED light source 419 in the Y-axis direction functions as a pseudo-red diffusion light source and a blue diffusion light source that emit red and blue diffused light, and The red and blue diffused light has a divergence angle equal to or greater than that of the green LED light source. Therefore, the diffused reflection member 426 diffuses the reflected red light and the blue light, and the green light emitted from the green LED light source 419 and incident on the LED light incident portion 422b is well mixed together in the light guide plate 422. The white light having no unevenness is emitted from the light-emitting plate surface 422c, and the luminance uniformity and the chromaticity uniformity are high. Further, in contrast to the conventional use of the light guide bar on each of the light sources, since the light guide plate 422 is used in this aspect, it is preferable to reduce the number of parts. Furthermore, since the diffuse reflection member 426 is physically separated from the light guide plate 422, regardless of the positional relationship of the light guide plate 422 with respect to the respective laser light sources 417, 418, the diffuse reflection member 426 is opposed to each of the laser light sources 417, The positional relationship of 418 is fixed. Therefore, even if the position of the light guide plate 422 with respect to each of the laser light sources 417, 418 is deviated, the positional relationship of the diffuse reflection member 426 with respect to each of the laser light sources 417, 418 remains stable, so red and blue The reliability of each of the colored laser light diffused and reflected by the diffuse reflection member 426 is high. Further, the diffuse reflection member 426 is configured such that the LED light source substrate 421 having the green LED light source 419 is disposed so as to face the laser light incident portion 422e of the light guide plate 422. In addition, the white balance of the image displayed on the liquid crystal panel 411 can be adjusted by adjusting the outputs of the red laser light source 417, the blue laser light source 418, and the green LED light source 419 without adjusting the liquid crystal panel 411. The Y value of each pixel of R, G, and B.

As shown in FIGS. 10 and 11, the LED light source substrate 421 integrally provided with the diffuse reflection member 426 and the laser light source substrate 420 having the red laser light source 417 and the blue laser light source 418 are disposed. It is mounted on a common chassis 414. Therefore, compared with the case where the diffuse reflection member and the light guide plate 422 are assumed to be integrated, the red laser light source 417 and the blue laser light source 418 and the diffuse reflection member 426 can be in the X-axis direction and the Z-axis direction. Align with high positional accuracy. Thereby, the reliability of the light diffusing reflection function of the diffuse reflection member 426 is appropriately performed.

As shown in FIGS. 10 and 11 , 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 . Further, the upper and lower sides of Fig. 10 coincide with the upper and lower sides in the vertical direction, the left side of Fig. 11 coincides with the lower side in the vertical direction, and the right side of Fig. 11 coincides with the upper side in the vertical direction. Further, 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, by using the gravity (self-weight) acting on the light guide plate 422, the diffusion reflection member 426 can be kept in a close state with respect to the laser incident light opposite portion 422, so that the laser light incident portion 422e and the diffusion reflection It is difficult to create a gap between the members 426. As a result, the red laser light and the blue laser light become difficult to leak light from the light incident opposite portion 422e, so that the diffusion reflection member 426 is diffused and reflected and effectively utilized.

The diffuse reflection member 426 and the laser incident light opposite portion 422e, as shown in Fig. 10, form a range in the X-axis direction with the red laser light source 417 and the blue laser light source 418 which constitute a group on the X-axis. The configuration range in the direction is almost equal. That is, the diffuse reflection member 426 is formed to span a red laser light source 417 and a blue laser light source 418 which constitute a group. With such an aspect, the present aspect can be efficiently utilized by the diffuse reflection member 426 as compared with the case where the diffuse reflection members are assumed to individually correspond to the red laser light source 417 and the blue laser light source 418 constituting a group. The red laser light and the blue laser light are scattered and reflected, and the arrangement of the diffuse reflection member 426 becomes easy.

As described above, the backlight device (illuminating device) 412 of the present embodiment includes a laser light source, a light guide plate 422, and a diffuse reflection member 426; wherein the laser light source is a red laser light source 417 and blue that emits laser light. a laser light source 418; the portion of the outer peripheral end surface facing the laser light source, that is, the red laser light source 417 and the blue laser light source 418, is a laser light incident portion (light incident portion) into which the laser light is incident. 422a, a portion of the outer peripheral end surface on the opposite side of the laser light incident portion 422a is a laser light incident portion (light incident opposite portion) 422e, and one of the pair of plate surfaces is set to emit light. The light-reflecting member 426 is disposed so as to face the laser light incident portion 422e of the light guide plate 422, and is physically separated from the light guide plate 422 to diffusely reflect the laser light.

With such an aspect, the laser light emitted from the laser light source 417 and the blue laser light source 418 is incident on the laser light incident portion 422a of the light guide plate 422, and is disposed in the light guide plate 422. In a straight forward form, the laser is directed into the light opposite portion 422e. The laser light reaching the laser light incident opposite portion 422e is diffused and reflected by the diffuse reflection member 426, and the diffuse reflection member 426 is disposed in a form facing the laser light incident portion 422e, whereby the laser light is on the light guide plate The inside of the 422 is diffused and travels toward the side of the laser light incident portion 422a, and is emitted from the light exiting plate surface 422c. Therefore, in the plane of the light-emitting plate surface 422c, the luminance uniformity of the emitted light is high. Further, in contrast to the conventional use of the light guide bar on each of the light sources, since the light guide plate 422 is used in this aspect, it is preferable to reduce the number of parts.

The diffuse reflection member 426 is physically separated from the light guide plate 422, regardless of the positional relationship of the light guide plate 422 with respect to the laser light source, that is, the red laser light source 417 and the blue laser light source 418, and the diffuse reflection member 426 is opposed to the lightning. The positional relationship between the source of the red laser light source 417 and the blue laser source 418 is fixed. Therefore, even if it is assumed that the light guide plate 422 is in a positional deviation with respect to the laser light source ray, that is, the red laser light source 417 and the blue laser light source 418, the diffuse reflection member 426 is opposite to the laser light source 417 and the laser light source 417 and The positional relationship of the blue laser light source 418 remains stable, so that the laser light is highly diffused and reflected by the diffuse reflection member 426.

Further, an LED light source, that is, a green LED light source 419 and an LED light source substrate 421 are provided, and the LED light source substrate 421 is provided with an LED light source, that is, a green LED light source 419, and faces the laser light incident portion 422e; the light guide plate 422 has a periphery thereof. The portion of the end surface that is at least facing the LED light source, that is, the green LED light source 419, is the LED light incident portion 422b into which the light of the green LED light source 419 is incident, and the diffuse reflection member 426 is disposed on the LED light source substrate 421. In this way, the light emitted by the LED light source, that is, the green LED light source 419, is incident on the LED light incident portion 422b of the light guide plate 422, propagates through the light guide plate 422, and is then emitted from the light exit plate surface 422c. The diffused reflection member 426 can be disposed in the form of the laser light incident opposite portion 422e of the light guide plate 422 by the LED light source substrate 421 having the green LED light source 419, which is an LED light source.

In addition, a laser light source substrate 420 and a chassis (frame) 414 are provided; wherein the laser light source substrate 420 is configured with a laser light source 417, a red laser light source 417 and a blue laser light source 418, and faces the laser. The light incident portion 422a; the chassis (frame) 414 is provided with a laser light source substrate 420 and an LED light source substrate 421, and houses the light guide plate 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 mounted on the common chassis 414, thereby maintaining the laser light source 417 and the blue laser light source. The positional accuracy of the positional relationship between the light source 418 and the diffuse reflection member 426 is high, which is preferable.

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 diffusion reflection member 426 is disposed in contact with the laser light incident portion 422e of the light guide plate 422. In this way, by the gravity acting on the light guide plate 422, the laser light incident opposite portion 422e and the diffuse reflection member 426 can be kept in close contact state. As a result, light leakage between the laser light incident portion 422e and the diffuse reflection member 426 is less likely to occur, and the light utilization efficiency is excellent.

In addition, the laser source includes a red laser source 417 that emits red laser light and a blue laser source 418 that emits blue laser light. In contrast, the LED source includes a green LED source 419 that emits green light. In this way, the diffuse reflection member 426 diffuses and reflects the red laser light and the blue laser light emitted by the red laser light source 418 and the blue laser light source 419, and can be used as a pseudo-red diffusion light source that emits diffused light and Since the blue diffused light source functions, the red light and the blue light diffused and reflected by the diffuse reflection member 426 and the green light emitted from the green LED light source 419 and incident on the LED light incident portion 422b are together on the light guide plate. The inside of 422 is well mixed, and is emitted as white light by the light exiting plate surface 422c. The red laser light emitted by the red laser light source 417 and the blue laser light emitted by the blue laser light source 418 have almost no interference in the wavelength range, and the green light emitted by the green LED light source 419 The wavelength range is also almost no interference. Thereby, the color purity of each color becomes extremely high. Moreover, the green LED light source 419 has a good luminous efficiency compared to the green laser light source that emits green laser light, so that high luminance can be obtained with low power consumption.

Further, the red laser light source 417 and the blue laser light source 418 are disposed in a form adjacent to each other; the diffuse reflection member 426 is formed to span the red laser light source 417 and the blue laser light source 418. In this way, red laser light and blue laser light can be efficiently scattered and reflected by forming a diffuse reflection member 426 that spans the red laser light source 417 and the blue laser light source 418 that are adjacent to each other.

Further, the liquid crystal display device (display device) 410 of the present embodiment includes the above-described backlight device 412 and a liquid crystal panel (display panel) 411 that displays an image by the light irradiated by the backlight device 412. With such a liquid crystal display device 410, as the number of parts of the backlight device 412 is reduced, the reliability of the laser light in the backlight device 412 being diffused and reflected by the diffuse reflection member 426 is high, so that the manufacturing cost can be reduced. At the same time, the display with excellent display quality can be realized.

Further, the television receiving device 410TV of the present embodiment includes the above-described liquid crystal display device 410. With such a television receiving device 410TV, as the manufacturing cost of the liquid crystal display device 410 is reduced, the display quality can be excellent, and therefore, the TV with excellent display quality can be obtained while having an advantage in price competitiveness. The display of the image, etc. is implemented.

(implementation type 6)

Embodiment 6 of the present invention is described in Fig. 13 or Fig. 14. This embodiment 6 shows a state in which the diffuse reflection member is changed. Incidentally, the same structures, operations, and effects as those of the above-described embodiment 5 are omitted in order to avoid redundancy.

The diffuse reflection member 5126 of the present embodiment is provided on the light guide plate supporting member 5124 as shown in Figs. 13 and 14. In detail, a pair of light guide plate supporting members 5124 respectively support both ends of the light guide plate 5122 in the Y-axis direction, and among the pair of light guide plate supporting members 5124, the laser light source is disposed in the Y-axis direction. On the opposite side of the substrate 5120 side, that is, the light guide plate supporting member 5124 on the side of the LED light source substrate 5121, a diffusion reflection member 5126 is provided. The diffuse reflection member 5126 is formed so as to stand up toward the front side (opposite side of the protruding side of the leg portion 5124b) by the main body portion 5124a constituting the light guide plate supporting member 5124, and is disposed to face the laser of the light guide plate 5122. The form of the light incident portion 5122e. The diffuse reflection member 5126 is disposed on the main body portion 5124a at a plurality of intervals in the X-axis direction, and is disposed in alignment with the arrangement of the plurality of laser light incident portions 5122e in the light guide plate 5122. The diffuse reflection member 5126 is directly in contact with the laser light incident portion 5122e of the light guide plate 5122, but is spaced apart from the LED light source substrate 5121 (arranged at intervals). In this manner, the diffusing reflection member 5126 can be disposed in the form of the laser incident light incident portion 5122e facing the light guide plate 5122 by the light guide plate supporting member 5124 for supporting the light guide plate 5122.

According to the above-described embodiment, the light guide plate supporting member 5124 that supports the light guide plate 5122 from the side opposite to the side of the light exit plate surface 5122c is provided, and the diffusion reflection member 5126 is provided on the light guide plate supporting member 5124. In this way, the light guide plate 5122 is supported by the opposite side of the light guide plate supporting member 5124 from the side of the light exit plate surface 5122c, whereby the laser light source, that is, the red laser light source 5117 and the blue laser light source 5118, and the laser beam are incident. The positional relationship between the light portions 5122a can be kept stable. With the light guide plate supporting member 5124, the diffuse reflection member 5126 can be disposed in a form facing the laser light incident portion 5122e of the light guide plate 5122.

(implementation type 7)

Embodiment 7 of the present invention is illustrated in Fig. 15. This embodiment 7 shows a configuration in which the structure of the laser light incident portion and the LED light incident portion is changed by the above-described embodiment 5. Incidentally, the same structures, operations, and effects as those of the above-described embodiment 5 are omitted in order to avoid redundancy.

As shown in Fig. 15, the light guide plate 6222 of the present embodiment is provided with a light refraction portion 627 on the outer peripheral end surface of the laser light incident portion 6222a and the LED light incident portion 6222b. The light-refracting portion 627 is formed by performing uneven processing on each surface of the laser light incident portion 6222a and the LED light incident portion 6222b, and the cross-sectional shape thereof is prismatic. The light refracting portion 627 imparts laser light incident on each of the laser light sources 6222a by the respective laser light sources 6217 and 6218 or green light incident on the LED light incident portion 6222b by the green LED light source 6219. The refraction that causes the divergence angles to expand. Each of the lights that are provided with the refracting action by the light refracting portion 627 travels in the light guide plate 6222 in a form away from the respective light incident portions 6222a and 6222b in the Y-axis direction (for example, by the laser light incident portion 6222a side). The light is caused to diverge in the X-axis direction while the laser light entering the light opposite portion 6222e is traveling, and the light distribution range is gradually enlarged. In particular, each of the laser beams is expanded by the light refracting portion 627, and when it reaches the laser incident light opposite portion 6222e, it is irradiated onto the diffuse reflection member 6226 in a wider range and is diffused and reflected. The diffusion range of the diffused reflected light via the diffuse reflection member 6226 becomes wider. Thereby, in the surface of the light-emitting plate surface 6222c of the light guide plate 6222, the brightness uniformity of the emitted light becomes higher.

According to the above-described embodiment, at least the laser light incident portion 6222a of the outer peripheral end surface of the light guide plate 6222 is such that the light distribution range of the laser light incident on the laser light incident portion 6222a is increased by the laser light incident portion. The 6222a side is provided with a light refracting portion 627 that imparts a refractive power to the laser light so that the laser light incident light portion 6222e is enlarged. In this way, the laser light emitted by the laser light source, that is, the red laser light source 6217 and the blue laser light source 6218, is incident on the laser light incident portion 6222a by the light refraction portion 627. The laser light to which the refractive effect is applied travels from the side of the laser light incident portion 6222a toward the laser light incident light portion 6222e in the light guide plate 6222, and the light distribution range is enlarged during the traveling. Therefore, the laser light reaching the laser light incident opposite portion 6222e is irradiated onto the diffuse reflection member 6226 in a wider range and diffused and reflected, so that the diffusion range of the diffused reflection light passing through the diffusion reflection member 6226 becomes More broad. Thereby, in the surface of the light-emitting plate surface 6222c, the brightness uniformity of the emitted light becomes higher.

(implementation type 8)

Embodiment 8 of the present invention is illustrated in Fig. 16. This embodiment 8 shows an arrangement in which the above-described embodiment 5 is changed to the arrangement of the red laser light source 7317 and the blue laser light source 7318. Incidentally, the same structures, operations, and effects as those of the above-described embodiment 5 are omitted in order to avoid redundancy.

The red laser light source 7317 and the blue laser light source 7318 of the present embodiment, as shown in Fig. 16, are configured such that light sources constituting one group are arranged close to each other. That is, between the red laser light source 7317 and the blue laser light source 7318 which constitute one set, there is almost no gap 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 reduced. In such an aspect, the red laser light source 7317 and the blue laser light source 7318 are emitted, and the red laser light and the blue laser light diffused and reflected by the diffuse reflection member 7326 in the light guide plate 7322 are compared with In the above-described embodiment 5, the red laser light and the blue laser light of the present embodiment or the green light emitted by the green LED light source 7319 may become difficult to mix. Therefore, in the light guide plate 7322, at the end portions on the side of the green LED light source 7319 and the diffuse reflection member 7326, a color mixing region for mixing red laser light, blue laser light, and green light is set (compared with Fig. 16). The area of the lower side of the chain is shown as the lower side) MA.

(implementation type 9)

Embodiment 9 of the present invention is described in Fig. 17 or Fig. 18. This embodiment 9 shows the use of a green laser light source instead of the green LED light source of the above-described embodiment 5. Incidentally, the same structures, operations, and effects as those of the above-described embodiment 5 are omitted in order to avoid redundancy.

The backlight device 8412 of this embodiment, as shown in FIGS. 17 and 18, does not have an LED light source, but has a red laser light source 8417, a blue laser light source 8418, and a green laser light source 828 as a light source. . Further, in Fig. 17, for convenience of distinction, the green laser light source 828 is represented by a diagonal stripe pattern. 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 in an in-line arrangement at regular intervals along the X-axis direction. Therefore, the backlight device 8412 is provided with a laser light source substrate 8420 at one of the ends in the short-side direction, and is derived from the light of the respective laser light sources 828, 8417, and 8418 with respect to the light guide plate 8422. It is a single-side light-in type, which is a side-lit type. The light guide plate 8422 has an end surface of one of the long sides of the outer peripheral end surface (the upper side shown in FIG. 17), and has a laser light incident portion 8422a facing the red laser light source 8417 and a blue laser light source 8418. The laser light entering portion 8242a and the laser light incident portion 8242a facing the green laser light source 828. On the other hand, the light guide plate 8422 has an end surface on the other side (the lower side shown in FIG. 17) on the long side of the outer peripheral end surface, which is located on the opposite side of each of the above-described laser light incident portions 8422a, and is set as a laser. The light incident opposite portion 8422e.

Further, the diffusion reflection member 8426 is disposed so as to face the entire area of the other end surface (the end surface having the laser light incident portion 8422e) in the outer peripheral end surface of the light guide plate 8422. That is, the diffuse reflection member 8426 is opposite to the plurality of laser incident light opposite portions 8422e arranged at regular intervals in the X-axis direction on the other end surface, and is also opposite to the laser incident light. The portion 8242e is adjacent. In this way, regardless of the positional relationship of the diffuse reflection members 8426 with respect to the respective laser light sources 828, 8417, and 8418 in the X-axis direction, the laser light of each color can be diffused and reflected, and therefore, the laser light of each color is diffused and reflected. The reliability of the member 8426 being diffused and reflected is high. Further, in the X-axis direction, it is not necessary to align the diffuse reflection members 8426 with the respective laser light sources 828, 8417, and 8418 in the X-axis direction, which is easy to manufacture. The diffuse reflection member 8426 is provided in the pair of light guide plate supporting members 8424, and is disposed on the light guide plate supporting member 8424 on the opposite side of the laser light source substrate 8420 side in the Y-axis direction, and the pair of light guide plates support The members 8424 respectively support both end portions of the light guide plate 8422 in the Y-axis direction. The diffuse reflection member 8426 provided in the light guide plate supporting member 8424 is the same structure as the above-described embodiment 6, and thus the overlapping description will be omitted.

(other implementation types)

The present invention is not limited to the embodiments described above with reference to the drawings and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In addition to the above embodiments, the following materials may be used as the diffusion reflection member: a foamed resin material made of PET or the like; and a multilayer film reflection sheet having a dielectric multilayer film structure, wherein The dielectric multilayer film is formed by laminating dielectric layers having different refractive indices, a metal reflective film made of a metal material, and the like.

(2) In the above embodiments, the diffuse reflection member is attached to the light guide plate by an adhesive or a double-sided tape, and post-processing is performed to provide the diffusion-reflecting member to the manufactured light guide plate. In the process of manufacturing the light guide plate, the diffusion reflection member is mounted on the light guide plate. Specifically, in the case where the metal reflective film is used as the diffuse reflection member in the above (1), the metal reflective film can be directly provided on the light guide plate by vapor deposition or the like.

(3) In addition to the above embodiments, the arrangement of the laser light source substrate or the LED light source substrate in the Y-axis direction with respect to the light guide plate may be appropriately changed.

(4) In the above embodiments 2 to 4, although the aspect shown is that only one green LED light source is interposed between adjacent diffused reflection members, a plurality of green LED light sources may be used adjacent to each other. The aspect between the diffuse reflection members. In other words, the green LED light source can also configure a complex array in a plurality of forms.

(5) In addition to the above embodiment, the specific formation range, arrangement, and the like of the diffuse reflection member may be appropriately changed.

(6) In the above-described embodiments 2 to 4, the green light source is used as the LED light source, but any of red or blue may be used as the LED light source, and a green laser light source may be included. In addition, two of red, green, and blue may be used as LED light sources, and the remaining one may be used as a laser light source. In this case, for example, red may be used as a laser light source, and a cyan (cyan) LED light source may be used, and other combinations may be employed as appropriate.

(7) As a modification of the above-described embodiment 3, the light refraction portion may be provided on the entire region facing one of the end faces of the laser light source substrate. Further, the light-receiving portion may be omitted in the LED light-incident portion.

(8) The aspect (photorefractive portion) described in the above embodiment 3 may be combined with the aspect described in the embodiment 1 or the embodiment described in the embodiment 4.

(9) In addition to the above embodiments, the specific emission spectrum (a numerical value such as a main emission wavelength or a half-value width) of the red laser light source, the blue laser light source, and the green LED light source may be appropriately changed.

(10) In addition to the above-described embodiments, the specific transmission spectrum (a numerical value such as a peak wavelength or a half-value width) of each of the colored portions of R, G, and B constituting the color filter may be appropriately changed.

(11) In the above embodiments, the color filter of the liquid crystal panel is exemplified by three colors of red, green, and blue, but has four colors of red, green, and blue, plus yellow or white. The aspect of the constructed color filter can also be applied to the present invention.

(12) In the above embodiments, the mode of operation of the liquid crystal panel is the VA mode, but it may be an FFS (Fringe Field Switching) mode or the like. In the FFS mode, as the opposite electrode on the CF substrate side is removed, a common electrode that forms an electrical boundary with the pixel electrode is provided on the array substrate side.

(13) In the above embodiments, the liquid crystal display device (liquid crystal panel or backlight device) has a horizontally long square shape, but the planar shape of the liquid crystal display device may be a vertically long square. Type, square, oblong shape, elliptical shape, circle, trapezoid, shape with partial surface, etc.

(14) In each of the above embodiments 5 to 9, the diffuse reflection member is integrally provided on the LED light source substrate or the light guide plate supporting member, but the diffusion reflection member may be integrally formed. Set on the bottom or side of the chassis. Further, the diffuse reflection member may be provided as an individual with the LED light source substrate, the light guide plate supporting member, the chassis, and the like, and the diffuse reflection member may be attached to any of the diffused reflection members in this state.

(15) In each of the above embodiments 5 to 9, the laser light source and the laser light source substrate are arranged on the upper side with respect to the light guide plate in the vertical direction, and the diffuse reflection member is disposed. It is on the lower side in the vertical direction with respect to the light guide plate, but it may be reversed.

(16) In each of the above embodiments 5 to 9, although the aspect shown is that only one green LED light source is interposed between adjacent diffused reflection members, a plurality of green LED light sources may be used. A pattern between adjacent diffuse reflection members. In other words, the green LED light source can also configure a complex array in a plurality of forms.

(17) In the above embodiments 5 to 8, although the green light is used as the LED light source, any of red or blue may be used as the LED light source, and a green laser light source may be included. In addition, two of red, green, and blue may be used as LED light sources, and the remaining one may be used as a laser light source. In this case, for example, red may be used as a laser light source, and a cyan (cyan) LED light source may be used, and other combinations may be employed as appropriate.

Claims (13)

 A lighting device comprising: a laser light source that emits laser light; and a light guide plate having a portion of the outer peripheral end surface facing the laser light source as the light incident portion into which the laser light is incident, wherein the outer peripheral end surface is located in the light incident portion a portion on the opposite side is a light incident opposite portion, and one of the pair of plate faces is a light exit plate surface through which light is emitted; and a diffuse reflection member is attached to the opposite portion of the light guide plate. Form and diffuse the laser light.    The illumination device of claim 1, wherein the laser light source comprises a red laser light source emitting red laser light, a green laser light source emitting green laser light, and a blue laser light source emitting blue laser light. And the red laser light source, the green laser light source, and the blue laser light source are arranged in an in-line shape; the diffuse reflection member is disposed on the outer peripheral end surface of the light guide plate and has the entire end surface of the light incident opposite portion On the area.    The illuminating device of claim 1, wherein the illuminating device comprises an LED light source and an LED light source substrate constituting the LED light source facing the opposite light incident portion; at least the outer peripheral end surface of the light guide plate is opposite A portion of the LED light source is an LED light incident portion into which light of the LED light source is incident; and the diffuse reflection member is disposed in a form adjacent to the LED light incident portion.    An illumination device comprising: a laser light source that emits laser light; and a light guide plate having a portion of the outer peripheral end surface facing the laser light source as the light incident portion into which the laser light is incident, wherein the outer peripheral end surface is located in the light incident portion The opposite side portion is a light incident opposite portion, and one of the pair of plate faces is a light exit plate surface through which light is emitted; and a diffuse reflection member is disposed in a form of the light incident opposite portion of the light guide plate And physically separating from the light guide plate, diffusing and reflecting the laser light.    The illuminating device of claim 4, wherein the illuminating device comprises an LED light source and an LED light source substrate constituting the LED light source and facing the opposite light incident portion; at least the outer peripheral end surface of the light guide plate is opposite The portion of the LED light source is set as an LED light incident portion into which the light of the LED light source is incident; and the diffuse reflection member is disposed on the LED light source substrate.    The illumination device of claim 5, comprising: a laser light source substrate configured to mount the laser light source and facing the light incident portion; and a frame body mounted with the laser light source substrate and the LED light source The substrate is housed and the light guide plate is housed.    The illuminating device of claim 5 or 6, wherein the LED light source substrate is disposed on a lower side in a vertical direction with respect to the light guide plate; the diffuse reflection member is disposed opposite to the light incident portion of the light guide plate The form of the connection.    The illuminating device of any one of claims 3, 5, 6, or 7, wherein the laser light source comprises a red laser light source emitting red laser light and a blue laser light source emitting blue laser light; In contrast, the LED light source includes a green LED light source that emits green light.    The illuminating device of claim 8, wherein the red laser light source and the blue laser light source are disposed adjacent to each other; the diffuse reflection member is formed over the red laser light source and the blue Laser source.    The illuminating device of claim 4, wherein the illuminating device includes a light guiding plate supporting member that supports the light guiding plate from an opposite side of the light emitting plate surface side; the diffusing and reflecting member is disposed on the light guiding plate supporting member.    The illuminating device according to any one of the preceding claims, wherein the outer peripheral end surface of the light guide plate is at least at the light incident portion such that the laser light incident on the light incident portion is distributed. The light refracting portion that imparts a refractive action to the laser light is provided in such a manner that the light incident portion is enlarged toward the light incident portion.    A display device comprising: the illumination device according to any one of claims 1 to 11; and a display panel that displays an image using light irradiated by the illumination device.    A television receiving device comprising the display device of claim 12 of the patent application.