JP2015146294A - Illumination device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illumination device and a display device having high reliability.SOLUTION: An illumination device comprises a light source, a glass member that comprises a fluorescence material absorbing at least part of light of the light source to emit light of a wavelength different from a wavelength of the light of the light source, an encapsulation resin layer between the light source and the glass member, an optical member having a light incident surface facing the light source with the glass member interposed therebetween, and a reflection sheet that reflects at least part of the light having passed through the glass member to make it enter the light incident surface.

Description

  The present technology relates to an illumination device suitable for a surface light source and a display device including the illumination device.

  A method of emitting light by combining an LED (Light Emitting Diode) and a fluorescent material has been reported (for example, Patent Documents 1, 2, and 3). In Patent Document 3, this method is applied to a backlight of a liquid crystal display device. This backlight includes a fluorescent material in a resin material around the LED.

JP 2008-10556 A JP 2009-70892 A JP 2013-72905 A

  In an illumination device used for such a backlight of a display device, it is desired to improve reliability.

  The present technology has been made in view of such problems, and an object thereof is to provide a lighting device having high reliability and a display device including the lighting device.

  An illumination device according to an embodiment of the present technology includes a light source, a glass member including a fluorescent material that emits light having a wavelength different from the wavelength of the light of the light source by absorbing at least a part of the light of the light source, and between the light source and the glass member An encapsulating resin layer; an optical member having a light incident surface facing the light source with the glass member interposed therebetween; and a reflective sheet that reflects at least part of the light that has passed through the glass member and enters the light incident surface. It is a thing.

  The display device of the present technology includes the above-described illumination device on the back side of the liquid crystal panel.

  In the illumination device or the display device of the present technology, a sealing resin layer is provided between the light source and the glass member, and the light source and the glass member are separated from each other. Since this glass member contains a fluorescent material, the fluorescent material is not easily affected by light emitted from the light source and heat.

  According to the illumination device and the display device of the present technology, since the glass member includes the fluorescent material, deterioration of the fluorescent material due to the light source can be suppressed. Therefore, reliability can be improved. Note that the effects described here are not necessarily limited, and may be any effects described in the present disclosure.

It is sectional drawing showing the structure of the principal part of the illuminating device which concerns on 1st Embodiment of this technique. It is a perspective view showing the whole structure of the illuminating device shown in FIG. It is sectional drawing showing the detailed structure of the glass member shown in FIG. It is a perspective view showing the structure of the reflective sheet shown in FIG. 6 is a cross-sectional view illustrating a configuration of a lighting device according to Comparative Example 1. FIG. 12 is a cross-sectional view illustrating a configuration of a lighting device according to Comparative Example 2. FIG. It is sectional drawing showing the structure of the principal part of the illuminating device which concerns on a modification. It is sectional drawing showing the structure of the illuminating device which concerns on the comparative example 3. It is sectional drawing showing the structure of the principal part of the illuminating device which concerns on 2nd Embodiment of this technique. It is sectional drawing showing the detailed structure of the glass member shown in FIG. It is a perspective view showing an example of the external appearance of the display apparatus to which the illuminating device shown in FIG. 1 etc. is applied. FIG. 12 is an exploded perspective view showing the main body shown in FIG. 11. FIG. 13 is an exploded perspective view illustrating the panel module illustrated in FIG. 12. It is a perspective view showing the external appearance of the application example 1 of the panel module shown in FIG. 12 is another perspective view showing the appearance of application example 1. FIG. 12 is a perspective view illustrating an appearance of application example 2. FIG. 14 is a perspective view illustrating an appearance of Application Example 3 viewed from the front side. FIG. 12 is a perspective view illustrating an appearance of Application Example 3 viewed from the back side. FIG. 14 is a perspective view illustrating an appearance of application example 4. FIG. 14 is a perspective view illustrating an appearance of application example 5. FIG. It is a figure showing the closed state of the example 6 of application. It is a figure showing the open state of the example 6 of application. It is a perspective view showing an example of the external appearance of the general illumination to which the illuminating device shown in FIG. 1 etc. is applied. It is a perspective view showing the other example of the general illumination shown in FIG. It is a perspective view showing the other example of the general illumination shown in FIG.

Hereinafter, embodiments of the present technology will be described in detail with reference to the drawings. The description will be given in the following order.
1. 1st Embodiment (illuminating device: Example in which sealing resin layer and glass member are in contact)
2. Modified example (example in which an adhesive resin layer is provided between the sealing resin layer and the glass member)
3. 2nd Embodiment (illuminating device: Example which has several light source in one light emission part)
4). Application examples (display devices, general lighting)

<First Embodiment>
FIG. 1 illustrates a cross-sectional configuration of a main part of an illumination device (illumination device 1) according to a first embodiment of the present technology. The illumination device 1 is used, for example, as a surface light source that illuminates a transmissive liquid crystal panel from behind, that is, a backlight. The light emitting unit 10 of the lighting device 1 is mounted on the light source substrate 11 so that light generated by the light emitting unit 10 enters the light incident surface 20A of the light guide plate 20 (optical component) via the air layer 17. ing. Reflecting sheets 16 </ b> A and 16 </ b> B are provided from the light guide plate 20 to the light emitting unit 10. The light emitting unit 10 includes a light source 12, a package 13, a sealing resin layer 14, and a glass member 15, and the light source 12 and the sealing resin layer 14 are accommodated in an opening of the package 13. The glass member 15 covers the opening of the package 13. The light from the light source 12 passes through the glass member 15 and enters the light guide plate 20.

  FIG. 2 shows the overall configuration of the lighting device 1. The lighting device 1 has a plurality of light emitting units 10. The lighting device 1 is provided with a reflecting member 30 and an optical sheet 40 in addition to the light emitting unit 10 and the light guide plate 20. The light incident surfaces 20A are the left and right end surfaces of the light guide plate 20, and the main surfaces (widest surfaces) of the light guide plate 20 and the back surface are light output surfaces 20B and 20D. That is, the lighting device 1 is an edge-type lighting device. In FIG. 2, the reflection sheets 16A and 16B are omitted.

  In the present specification, the stacking direction of the optical sheet 40, the light guide plate 20, and the reflecting member 30 is referred to as the Z (front / rear) direction, the left / right direction of the main surface of the light guide plate 20 is referred to as the X direction, and the up / down direction is referred to as the Y direction.

  The light source substrate 11 supports the light source 12 and supplies power to the light source 12. For example, the light source substrate 11 has a wiring pattern on a rectangular glass epoxy substrate, a metal substrate, or a flexible substrate. A plurality of light emitting units 10 are arranged along the longitudinal direction (Y direction) of the rectangular light source substrate 11. There may be one light emitting unit 10.

  The light source 12 (FIG. 1) is, for example, an LED that generates blue light (for example, light having a peak at a wavelength of 430 to 495 nm). The light source 12 is sealed in the opening of the package 13 by the sealing resin layer 14. The package 13 is made of a material having a high reflectance with respect to light generated in the light emitting unit 10. Examples of the constituent material of the package 13 include a heat-resistant polymer or ceramic. The sealing resin layer 14 is made of a light transmissive resin material and is filled in the opening of the package 13 so as to cover the light source 12. In other words, the sealing resin layer 14 is provided between the light source 12 and the glass member 15. For the sealing resin layer 14, it is preferable to use a resin material having a refractive index close to that of the glass member 15. The refractive index of the glass member 15 is 1.4 to 2.0, for example, and the refractive index of the sealing resin layer 14 is 1.2 to 2.0, for example. The sealing resin layer 14 is made of, for example, a silicone resin, an epoxy resin, an acrylic resin, or the like.

  The glass member 15 is formed in a plate shape having an area larger than the opening area of the package 13, for example. The thickness (X direction) of the glass member 15 is, for example, 50 μm to 300 μm. The sealing resin layer 14 is in contact with one surface (YZ plane) of the glass member 15, and the air layer 17 is in contact with the other surface. That is, in the light emitting unit 10, the glass member 15 is provided apart from the light source 12. A pair of end surfaces (XY plane) of the glass member 15 is covered with the package 13, for example. The reflection sheets 16 </ b> A and 16 </ b> B may be in contact with the end surface of the glass member 15.

  FIG. 3 shows a detailed configuration of the glass member 15. In the present embodiment, the glass member 15 includes the fluorescent material 152 together with the glass material 151 as described above. Although details will be described later, it is possible to suppress deterioration of the fluorescent material 152 due to light and heat of the light source 12.

  For the glass material 151, for example, low melting point glass can be used. The fluorescent material 152 dispersed in the glass material 151 absorbs at least a part of light incident on the glass member 15 from the light source 12 and emits light having a wavelength different from that of the light (blue light) of the light source 12. It is. The glass member 15 includes, for example, a fluorescent material 152R that emits red light (for example, light having a peak at a wavelength of 620 to 750 nm) and a fluorescent material 152G that emits green light (for example, light having a peak at a wavelength of 495 to 570 nm). . The fluorescent material 152 is made of, for example, a nitride, sulfide, or fluoride material.

  The light emitting unit 10 is formed as follows, for example. First, after the light source 12 is disposed in the opening of the package 13, the opening is filled with a resin material constituting the sealing resin layer 14. On the other hand, the glass member 15 is formed by dispersing the fluorescent material 152 in the glass material 151 and then molding it. The glass member 15 covers the light source 12 and the opening of the package 13 provided with the resin material in a lid shape. Thereafter, the resin material in the opening of the package 13 is cured by heating or light irradiation to form the sealing resin layer 14, and the glass member 15 is fixed. Thereby, the light emission part 10 is formed.

  The reflection sheets 16 </ b> A and 16 </ b> B are for reflecting at least part of the light that has passed through the glass member 15 and entering the light incident surface 20 </ b> A of the light guide plate 20. The reflection sheets 16 </ b> A and 16 </ b> B are provided outside both ends of the light incident surface 20 </ b> A of the light guide plate 20 and extend in parallel from the light guide plate 20 to the light emitting unit 10. The reflection sheets 16A and 16B are in contact with the light source substrate 11 and the light guide plate 20, for example. The reflection sheets 16 </ b> A and 16 </ b> B may be provided at least from the light guide plate 20 to the glass member 15. The surfaces (XY plane) of the reflection sheets 16A and 16B are arranged in a direction substantially perpendicular to the light incident surface 20A of the light guide plate 20 and in a direction substantially parallel to the light emission surfaces 20B and 20D of the light guide plate 20. (FIG. 4 described later). Although details will be described later, in this way, a part of the periphery of the optical path from the light emitting unit 10 to the light guide plate 20 is covered with the reflection sheets 16A and 16B, and thus the light incident surface of the light guide plate 20 from the light emitting unit 10 Light incident efficiency into 20A is improved. It is preferable to provide a pair of reflection sheets 16A and 16B so as to face each other with an optical path from the light emitting unit 10 (glass member 15) to the light guide plate 20 in between. The reflection sheets 16A and 16B are made of a material having a reflectance of 70% or more at a wavelength of 550 nm, for example. For the reflection sheets 16A and 16B, a regular reflection (specular reflection) material may be used, or a diffuse reflection material may be used. In the case where these have the same reflectance, the light incident efficiency from the light emitting unit 10 to the light incident surface 20A of the light guide plate 20 is further increased. Therefore, it is preferable to use a regular reflection material for the reflection sheets 16A and 16B. .

  As shown in FIG. 4, the reflection sheets 16 </ b> A and 16 </ b> B provided on the left and right end surfaces of the light guide plate 20 are provided in common for the plurality of light emitting units 10, for example.

  The air layer 17 is provided between the glass member 15 and the light incident surface 20 </ b> A of the light guide plate 20. Since the refractive index of the air layer 17 and the refractive index of the light guide plate 20 are different, the light guide efficiency of light after entering the light guide plate 20 is ensured.

  The light guide plate 20 mainly includes, for example, a transparent thermoplastic resin such as polycarbonate resin (PC) or acrylic resin, and the light of the light emitting unit 10 incident on the light incident surface 20A is emitted from the light emitting surface 20B (FIG. 2 to the optical surface 40 side main surface). The refractive index of the constituent material of the light guide plate 20 is about 1.4, for example. The light incident surface 20A of the light guide plate 20 faces the light source 12 with the glass member 15 therebetween. In order to improve the straightness of light propagating through the light guide plate 20, the light exit surface 20B is provided with a concavo-convex pattern composed of fine convex portions 20C, for example. The convex portion 20C is, for example, a belt-like protrusion or ridge extending in one direction (X direction in FIG. 2) of the light emitting surface 20B. You may make it comprise the light-projection surface 20B, without providing the convex part 20C. On the light exit surface 20D facing the light exit surface 20B, for example, a scattering agent is printed in a pattern as a scattering portion that scatters and makes the light propagating through the light guide plate 20 uniform. As the scattering portion, instead of the scattering agent, a portion containing a filler can be provided, or the surface can be partially roughened.

  The reflection member 30 (FIG. 2) is a plate-like or sheet-like member facing the main surface of the light guide plate 20, and is provided on the light emission surface 20 </ b> D side of the light guide plate 20. The reflecting member 30 returns light leaked from the light source 12 to the light emitting surface 20D side of the light guide plate 20 or light emitted from the inside of the light guide plate 20 to the light emitting surface 20D side to the light guide plate 20 side. It is. The reflection member 30 has functions such as reflection, diffusion, and scattering. Thereby, it is possible to efficiently use the light from the light emitting unit 10 and increase the front luminance.

  The reflecting member 30 is made of, for example, foamed PET (polyethylene terephthalate), a silver deposited film, a multilayer film reflecting film, or white PET. When the reflection member 30 is provided with a regular reflection function, it is preferable that the surface is subjected to treatment such as silver vapor deposition, aluminum vapor deposition, or multilayer film reflection. When the reflecting member 30 has a fine shape, the fine shape can be integrally formed by a method such as hot press molding or melt extrusion molding using a thermoplastic resin. Examples of the thermoplastic resin include acrylic resins such as PC and PMMA (polymethyl methacrylate), polyester resins such as PET, amorphous copolymer polyester resins such as MS (copolymer of methyl methacrylate and styrene), and polystyrene resins. Polyvinyl chloride resin and the like can be used. The fine shape may be formed by, for example, applying an energy ray (for example, ultraviolet ray) curable resin on a base material made of PET or glass, and then transferring the pattern thereto.

  The optical sheet 40 is provided on the light emitting surface 20B side of the light guide plate 20, and includes, for example, a diffusion plate, a diffusion sheet, a lens film, a polarization separation sheet, and the like. FIG. 2 shows only one of the plurality of optical sheets 40. By providing the optical sheet 40, light emitted from the light guide plate 20 in an oblique direction can be raised in the front direction, and the front luminance can be further increased.

  From the light emitting unit 10 of the lighting device 1, in addition to light having a wavelength (blue light) generated by the light source 12, light (red light and green light) in which the light of the light source 12 is wavelength-converted by the fluorescent material 152 of the glass member 15. Light) is emitted. These blue light, red light, and green light generated in the light emitting unit 10 enter the light incident surface 20A of the light guide plate 20. These lights travel through the light guide plate 20 and are emitted as white light from the light exit surface 20 </ b> B and pass through the optical sheet 40.

  Here, since the fluorescent material 152 is contained in the glass member 15 that is separated from the light source 12, the fluorescent material 152 is not easily affected by light emitted from the light source 12, heat, and the like. This will be described below.

  FIG. 5 illustrates a cross-sectional configuration of a lighting apparatus having a light emitting unit (light emitting unit 100) according to Comparative Example 1. The light emitting unit 100 does not have a glass member. The fluorescent material (fluorescent material 142) is included in the sealing resin layer 140 filled in the opening of the package 13 and is dispersed in the resin material 141. The sealing resin layer 140 accommodated in the package 13 together with the light source 12 is easily affected by light emitted from the light source 12 and heat. That is, the fluorescent material 142 is exposed to high light flux density and high temperature conditions. Such a fluorescent material 142 is rapidly deteriorated, and it becomes difficult for the light emitting unit 100 to maintain long-term reliability. In particular, when a sulfide-based or fluoride-based material is used for the fluorescent material 142, the fluorescent material 142 is easily deteriorated.

  On the other hand, in the light emitting unit 10 of the lighting device 1, the glass member 15 is provided at a position farther from the light source 12 than the sealing resin layer 14, and the fluorescent material 152 is included in the glass member 15. For this reason, compared with the light emitting part 100 in which the sealing resin layer 140 includes the fluorescent material 141, the fluorescent material 152 is less affected by light emitted from the light source 12, heat, and the like. Therefore, deterioration of the fluorescent material 152 caused by the light source 12 can be suppressed.

  Furthermore, the molecular structure of the glass material 151 that is an inorganic material is denser than the molecular structure of the resin material 141 that is an organic material, and the glass member 15 is less likely to transmit outside air, moisture, and the like. Therefore, contact between the fluorescent material 152 and the outside air or moisture is prevented, and deterioration of the fluorescent material 152 due to moisture absorption is suppressed.

  Further, by providing the reflection sheets 16A and 16B, the light incident efficiency from the light emitting unit 10 to the light incident surface 20A of the light guide plate 20 is improved. This will be described below.

  FIG. 6 illustrates a cross-sectional configuration of an illumination device (illumination device 101) according to Comparative Example 2. The lighting device 101 is not provided with a reflection sheet. Since the light distribution of the fluorescent material (for example, the fluorescent material 152 in FIG. 3) is a diffuse light distribution, the light passing through the glass member 15 spreads in all directions. Therefore, in the illumination device 101, a part of the light emitted from the light emitting unit 10 does not enter the light incident surface 20A of the light guide plate 20, and the light incident efficiency is lowered.

  On the other hand, in the lighting device 1, since the reflection sheets 16 </ b> A and 16 </ b> B are provided around the optical path from the light emitting unit 10 to the light incident surface 20 </ b> A of the light guide plate 20, the direction of the light emitted from the light emitting unit 10 is provided. The light incident efficiency from the light emitting unit 10 to the light incident surface 20A of the light guide plate 20 can be improved. For example, in the simulation result, when the reflection sheets 16A and 16B having a reflectance of 98% are used, the light incident efficiency from the light emitting unit 10 to the light incident surface 20A of the light guide plate 20 is higher in the lighting device 1 than in the lighting device 101. Is improved by 75.6%.

  As described above, in the present embodiment, since the glass member 15 includes the fluorescent material 152, the deterioration of the fluorescent material 152 can be suppressed and the reliability of the light emitting unit 10 can be improved. Furthermore, since it becomes easy to maintain the characteristics of the fluorescent material 152 for a long period of time, the types of usable fluorescent materials 152 can be increased. Further, since the reflection sheets 16A and 16B are provided, the light incident efficiency from the light emitting unit 10 to the light incident surface 20A of the light guide plate 20 can be improved.

  In addition, the light emitting unit 10 is formed by providing the light source 12 and the sealing resin layer 14 in the opening of the package 13 and then arranging the glass member 15 including the fluorescent material 152 in the opening of the package 13. That is, the glass member 15 that requires high-temperature firing can be formed separately from the resin package 13.

  Furthermore, even when a plurality of different types of fluorescent materials 152 (fluorescent materials 152R and 152G) are used, they can be mixed with the glass material 151 at the same time, and productivity can be improved.

  Hereinafter, modifications of the above-described embodiment and other embodiments will be described. In the following description, the same components as those of the above-described embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

<Modification>
FIG. 7 illustrates a cross-sectional configuration of a main part of a lighting device (lighting device 1A) according to a modification of the first embodiment. In the light emitting unit (light emitting unit 50) of the lighting device 1A, an adhesive resin layer 18 is provided between the sealing resin layer 14 and the glass member 15. Except for this point, the illuminating device 1A has the same configuration as the illuminating device 1 of the first embodiment, and the operation and effect thereof are also the same.

  The adhesive resin layer 18 is for fixing the glass member 15 to the sealing resin layer 14 and the package 13, and is made of, for example, a light transmissive resin material. For the adhesive resin layer 18, it is preferable to use a resin material having a refractive index close to that of the glass member 15 and that of the sealing resin layer 14. The refractive index of the adhesive resin layer 18 is, for example, 1.4 to 2.0. The adhesive resin layer 18 and the sealing resin layer 14 may be made of the same material. The adhesive resin layer 18 is made of, for example, a silicone resin, an epoxy resin, an acrylic resin, or the like.

  By providing such an adhesive resin layer 18, it is possible to improve the utilization efficiency of light emitted from the light source 12 and the fluorescent material 152. For example, in the simulation result, when the sealing resin layer 14 having a refractive index of 1.5, the adhesive resin layer 18 having a refractive index of 1.5, and the glass member having a refractive index of 1.5 are used, compared to the case where no adhesive resin layer is provided. Thus, the luminous flux of the light emitting unit 50 is improved by 4.4%.

  The reflection sheets 16 </ b> A and 16 </ b> B of the lighting device 1 </ b> A are provided around the optical path from the light emitting unit 50 to the light incident surface 20 </ b> A of the light guide plate 20, as described in the lighting device 1. The reflection sheets 16 </ b> A and 16 </ b> B also cover a pair of end surfaces (XY plane) of the adhesive resin layer 18 and a pair of end surfaces of the glass member 15. The end surface of the adhesive resin layer 18 and the end surface of the glass member 15 are preferably in contact with the reflection sheets 16A and 16B. Such reflection sheets 16 </ b> A and 16 </ b> B function to reflect at least part of the light that passes through the adhesive resin layer 18 and travels in a direction deviating from the direction of the glass member 15, and enters the glass member 15. This will be described below.

  FIG. 8 illustrates a cross-sectional configuration of an illumination device (illumination device 201) according to Comparative Example 3. The illumination device 201 is not provided with a reflection sheet. Since the light distribution of the light source 12 composed of LEDs is a diffuse light distribution, the light that has passed through the opening of the package 13 (sealing resin 14) spreads in all directions. Therefore, in the illumination device 201, a part of the light emitted from the light source 12 does not enter the glass member 15 from the adhesive resin layer 18, and the amount of light emitted from the light emitting unit 50 becomes low.

  On the other hand, in the lighting device 1A, the reflection sheets 16A and 16B cover the pair of end surfaces of the adhesive resin layer 18, so that light leaking from the end surfaces of the adhesive resin layer 18 is reflected and incident on the glass member 15. Can be made. For example, in the simulation result, when the reflection sheets 16A and 16B having a reflectance of 98% are used, the light amount of the light emitting unit 50 is improved by 9.5% in the lighting device 2 as compared with the lighting device 201.

  The light emitting unit 50 having the adhesive resin layer 18 is formed as follows, for example. First, after the light source 12 is disposed in the opening of the package 13, the opening is filled with the constituent resin material of the sealing resin layer 14. Next, the resin is cured by heating or light irradiation to form the sealing resin layer 14. On the other hand, the glass member 15 is formed by dispersing the fluorescent material 152 in the glass material 151 and then molding it. After the glass member 15 or the resin material constituting the adhesive resin layer 18 is provided in the opening of the package 13 provided with the light source 12 and the sealing resin layer 14, the glass member 15, the package 13, and the sealing resin layer 14 are provided. Paste together. Thereafter, the resin material is cured by heating or light irradiation to form the adhesive resin layer 18, and the glass member 15 is fixed. Thereby, the light emitting part 50 is formed.

  Thus, by using the adhesive resin layer 18, the glass member 15 can be provided after the sealing resin layer 14 is cured. That is, the glass member 15 can be combined with a commercially available set of the light source 12, the package 13, and the sealing resin layer 14. Therefore, the lighting device 1A can be easily manufactured.

  Further, the reflection sheets 16 </ b> A and 16 </ b> B can prevent light that has passed through the adhesive resin layer 18 from returning in the direction of the light source 12.

<Second Embodiment>
FIG. 9 illustrates a cross-sectional configuration of a main part of the illumination device (illumination device 2) according to the second embodiment of the present technology. The light emitting unit (light emitting unit 60) of the illuminating device 2 has two light sources (light sources 61 and 62) that generate light having different wavelengths. Except for this point, the illuminating device 2 has the same configuration as the illuminating device 1 of the first embodiment, and the operation and effect thereof are also the same.

  Both the light sources 61 and 62 are sealed in the opening of the package 13 with the sealing resin 14. The light source 61 is, for example, an LED that generates blue light, and the light source 62 is an LED that generates green light.

  FIG. 10 illustrates a cross-sectional configuration of the glass member 15 provided in the light emitting unit 60. The glass member 15 includes a fluorescent material 152 in the glass material 151, similarly to the light emitting unit 10 of the lighting device 1. The fluorescent material 152 is, for example, a fluorescent material 152R that emits red light by absorbing at least a part of blue light incident on the glass member 15 from the light source 61 or green light incident on the glass member 15 from the light source 62. The fluorescent material 152 may include a plurality of types of fluorescent materials. The light source 62 may be an LED that generates red light, and the fluorescent material 152 may be a fluorescent material that emits green light.

  From the light emitting unit 60 of the illuminating device 2, the light of the light source 61 is emitted by the fluorescent material 152 (fluorescent material 152 </ b> R) of the glass member 15 in addition to the light of the wavelengths generated by the light sources 61 and 62 (blue light and green light). The converted light (red light) is emitted. Blue light, red light, and green light generated by the light emitting unit 60 are incident on the light incident surface 20 </ b> A of the light guide plate 20. These lights travel through the light guide plate 20 and are emitted as white light from the light exit surface 20 </ b> B and pass through the optical sheet 40.

  The light emitted from the light sources 61 and 62 has a narrower half-value wavelength width than the light emitted from the fluorescent material 152. For this reason, it is possible to widen the color gamut by using a plurality of types of light sources (light sources 61 and 62).

<Application example 1>
FIG. 11 shows an appearance of a display device 110 (application example 1) to which the above-described illumination device (illumination devices 1, 1A, 2) is applied. The display device 110 is used as a thin television device, for example, and has a configuration in which a flat main body 110A for image display is supported by a stand 110B. The display device 110 is used as a stationary type with the stand 110B attached to the main body 110A and placed on a horizontal surface such as a floor, a shelf, or a stand, but the stand 110B is removed from the main body 110A. It can also be used as a wall-hanging type.

  FIG. 12 is an exploded view of the main body 110A. The main body 110A has, for example, a front exterior member (bezel) 111, a panel module 112, and a rear exterior member (rear cover) 113 in this order from the front side (viewer side). The front exterior member 111 is a frame-shaped member that covers the peripheral edge of the front surface of the panel module 112, and a pair of speakers 114 are disposed below the front exterior member 111. The panel module 112 is fixed to the front exterior member 111, and a power supply board 115 and a signal board 116 are mounted on the rear surface thereof, and a mounting bracket 117 is fixed. The mounting bracket 117 is for mounting a wall-mounted bracket, mounting a substrate, etc., and mounting the stand 110B. The rear exterior member 113 covers the back and side surfaces of the panel module 112.

  FIG. 13 is an exploded view of the panel module 112. The panel module 112 includes, for example, a front housing (top chassis) 121, a liquid crystal panel 122, a frame-shaped member (middle chassis) 80, and an illumination device (illumination devices 1, 1A, 2) from the front side (viewer side). , A rear housing (back chassis) 124, a balancer board 125, a balancer cover 126, and a timing control board 127 in this order.

  The front housing 121 is a frame-shaped metal part that covers the front peripheral edge of the liquid crystal panel 122. The liquid crystal panel 122 includes, for example, a liquid crystal cell 122A, a source substrate 122B, and a flexible substrate 122C such as COF (Chip On Film) that connects them. The frame-shaped member 80 is a frame-shaped resin component that holds the liquid crystal panel 122 and the optical sheet 40 of the lighting device. The rear housing 124 is a metal part made of iron (Fe) or the like that houses the liquid crystal panel 122, the frame-shaped member 80, and the lighting device. The balancer substrate 125 controls the lighting device 1 and is mounted on the back surface of the rear housing 124 and covered with a balancer cover 126. The timing control board 127 is also mounted on the back surface of the rear housing 124.

  In the display device 110 (FIG. 11), light from the illumination device is selectively transmitted through the liquid crystal panel 122 to perform image display. Here, as described in the above embodiment and the like, since the lighting device with high reliability is provided, the reliability of the display device 110 can be increased.

  Hereinafter, an application example of the panel module 112 as described above to an electronic device will be described. Examples of the electronic device include a television device, a digital camera, a notebook personal computer, a mobile terminal device such as a mobile phone, or a video camera. In other words, the panel module 112 can be applied to electronic devices in various fields that display an externally input video signal or an internally generated video signal as an image or video.

(Application example 1A)
14A and 14B show the appearance of an electronic book to which the panel module 112 is applied. The electronic book has, for example, a display unit 210 and a non-display unit 220, and the display unit 210 is configured by the panel module 112.

(Application example 1B)
FIG. 15 shows the appearance of a smartphone to which the panel module 112 is applied. For example, the smartphone includes a display unit 230 and a non-display unit 240, and the display unit 230 is configured by the panel module 112.

(Application example 1C)
16A and 16B show the appearance of a digital camera to which the panel module 112 is applied. The digital camera includes, for example, a flash light emitting unit 410, a display unit 420, a menu switch 430, and a shutter button 440, and the display unit 420 includes the panel module 112.

(Application Example 1D)
FIG. 17 shows the appearance of a notebook personal computer to which the panel module 112 is applied. The notebook personal computer has, for example, a main body 510, a keyboard 520 for inputting characters and the like, and a display unit 530 for displaying an image. The display unit 530 is configured by the panel module 112. .

(Application Example 1E)
FIG. 18 shows the appearance of a video camera to which the panel module 112 is applied. This video camera includes, for example, a main body 610, a subject photographing lens 620 provided on the front side surface of the main body 610, a start / stop switch 630 at the time of photographing, and a display 640. The display unit 640 includes the panel module 112.

(Application example 1F)
19A and 19B show the appearance of a mobile phone to which the panel module 112 is applied. For example, the mobile phone is obtained by connecting an upper housing 710 and a lower housing 720 with a connecting portion (hinge portion) 730, and includes a display 740, a sub-display 750, a picture light 760, and a camera 770. Yes. Of these, the display module 740 or the sub-display 750 is constituted by the panel module 112.

<Application example 2>
FIG. 20 shows the appearance of general illumination (application example 2) to which the illumination device (illumination devices 1, 1A, 2) is applied. This general illumination is a table-top illumination provided with the illumination device of the above-described embodiment or the like. For example, an illumination unit 843 is attached to a column 842 provided on the base 841. This illumination part 843 is comprised by the illuminating device which concerns on the said embodiment etc. The illumination unit 843 can have an arbitrary shape such as a cylindrical shape shown in FIG. 20 or a curved shape shown in FIG. 21 by making the light guide plate 20 into a curved shape.

  The lighting device according to the above embodiment may be applied to indoor general lighting as shown in FIG. In this general illumination, the illumination unit 844 is configured by the illumination device according to the above-described embodiment and the like. The illumination units 844 are arranged at an appropriate number and interval on the ceiling 850A of the building. Note that the lighting unit 844 can be installed not only in the ceiling 850A but also in an arbitrary place such as a wall 850B or a floor (not shown) depending on the application.

  In these general illuminations, illumination is performed by light from the illumination devices (illumination devices 1, 1A, 2). Here, as described in the above embodiment, since the lighting device with high reliability is provided, the reliability of general lighting can be improved.

  As described above, the present technology has been described with reference to the embodiment and the modification. However, the present technology is not limited to the above-described embodiment, and various modifications can be made. For example, in the above-described embodiments and the like, the case where the light source 12 that generates blue light is used has been described. However, the light source 12 generates visible light of other colors such as red or green, or light other than visible light such as ultraviolet light. It may be a thing. In the above-described embodiment and the like, the fluorescent material 152R that emits red light and the fluorescent material 152G that emits green light are exemplified as the fluorescent material, but the fluorescent material may be a fluorescent material that emits other colors such as yellow light. Good. The glass member 15 may include three or more types of fluorescent materials.

  Furthermore, in the above-described embodiment and the like, the case where the light incident surface 20A of the light guide plate 20 is the left and right end surfaces has been described, but the light incident surface 20A is 1 of the four end surfaces (upper and lower left and right) surrounding the main surface. There may be one, or three or more. Moreover, it is also possible to arrange the light source 12 at a position facing the main surface of the light guide plate 20 so that the illumination device (illumination device 1, 1A, 2) is a direct type. Furthermore, the planar shape of the light guide plate 20 may correspond to the shape of the person irradiated by the illumination device, and may be other than a rectangular shape. In addition, in the above-described embodiment and the like, the case where the light guide plate 20 is used as an optical component has been described. However, for example, instead of the light guide plate 20, light is transmitted to the optical sheet 40 side by a structure such as a back chassis such as the display device 110. You may make it guide.

  Furthermore, in the above-described embodiment and the like, the case where the light sources 12, 61, and 62 are LEDs has been described, but the light sources 12, 61, and 62 may be configured by a semiconductor laser or the like.

  In addition, the configuration of the lighting devices 1, 1 </ b> A, 2, the display device 110 (television device) and the like has been specifically described in the above embodiment, but it is not necessary to include all the components, Other components may be further provided.

  Furthermore, for example, the material and thickness of each layer described in the above embodiment are not limited, and other materials and thicknesses may be used.

  In addition, the effect described in this specification is an illustration to the last, and is not limited to this, There may exist another effect.

In addition, this technique can also take the following structures.
(1) A light source, a glass member including a fluorescent material that emits light having a wavelength different from the wavelength of the light of the light source by absorbing at least part of the light of the light source, and between the light source and the glass member A sealing resin layer, an optical member having a light incident surface facing the light source with the glass member in between, and a reflection that reflects at least a part of the light that has passed through the glass member and enters the light incident surface A lighting device comprising a sheet.
(2) The illumination device according to (1), wherein an air layer is provided between the glass member and a light incident surface of the optical member.
(3) The lighting device according to (2), wherein the reflection sheet extends from the glass member to the optical member.
(4) The lighting device according to (1) or (2), wherein the reflection sheet covers at least a part of a periphery of an optical path from the glass member to the light incident surface.
(5) The illumination device according to (4), wherein a pair of the reflection sheets facing each other with the optical path therebetween is provided.
(6) The illumination device according to any one of (1) to (5), wherein the reflectance of the reflective sheet at a wavelength of 550 nm is 70% or more.
(7) The lighting device according to any one of (1) to (6), wherein the reflection sheet is made of a regular reflection material.
(8) The illumination device according to any one of (1) to (6), wherein the reflection sheet is made of a diffuse reflection material.
(9) The lighting device according to any one of (1) to (8), wherein the glass member includes a plurality of different types of fluorescent substances.
(10) The illumination device according to any one of (1) to (9), wherein the light source emits visible light.
(11) The illumination device according to any one of (1) to (10), wherein the light source is a blue light source, and the fluorescent material includes a fluorescent material that emits red light and a fluorescent material that emits green light. .
(12) The illumination device according to any one of (1) to (10), including the plurality of light sources that emit light having different wavelengths.
(13) The illumination device according to any one of (1) to (12), wherein the light source and the sealing resin layer are accommodated in a package.
(14) The lighting device according to any one of (1) to (13), wherein the sealing resin layer and the glass member are in contact with each other.
(15) The lighting device according to any one of (1) to (13), wherein an adhesive resin layer is provided between the sealing resin layer and the glass member.
(16) The illumination device according to (15), wherein the reflection sheet reflects a part of the light that has passed through the adhesive resin layer and enters the glass member.
(17) The illumination device according to any one of (1) to (16), wherein the optical component is a light guide plate, and the light incident surface is an end surface of the light guide plate.
(18) The illumination device according to any one of (1) to (17), wherein the light source is an LED.
(19) The lighting device according to any one of (1) to (18), wherein the sealing resin layer includes a light-transmitting resin.
(20) A liquid crystal panel and an illumination device on the back side of the liquid crystal panel, wherein the illumination device absorbs at least a part of the light source and the light of the light source and has a wavelength different from the wavelength of the light of the light source. A glass member containing a fluorescent substance that emits light; a sealing resin layer between the light source and the glass member; an optical member having a light incident surface facing the light source with the glass member in between; and the glass And a reflection sheet that reflects at least part of the light that has passed through the member and enters the light incident surface.

  DESCRIPTION OF SYMBOLS 1, 1A, 2 ... Illuminating device 10, 50, 60 ... Light emission part, 11 ... Light source board | substrate, 12 ... Light source, 13 ... Package, 14 ... Sealing resin layer, 15 ... Glass member, 151 ... Glass material, 152 ... Fluorescent substance, 16A, 16B ... reflective sheet, 17 ... air layer, 18 ... adhesive resin layer, 20 ... light guide plate, 20A ... light incident surface, 20B, 20D ... light exit surface, 20C ... convex portion, 30 ... reflective member, 40: optical sheet, 110: display device.

Claims (20)

A light source;
A glass member containing a fluorescent material that absorbs at least part of the light from the light source and emits light having a wavelength different from the wavelength of the light from the light source;
A sealing resin layer between the light source and the glass member;
An optical member having a light incident surface facing the light source with the glass member in between;
A lighting device comprising: a reflection sheet that reflects at least part of the light that has passed through the glass member and enters the light incident surface. The lighting device according to claim 1, further comprising an air layer between the glass member and a light incident surface of the optical member. The lighting device according to claim 2, wherein the reflection sheet extends from the glass member to the optical member. The illuminating device according to claim 1, wherein the reflection sheet covers at least a part of a periphery of an optical path from the glass member to the light incident surface. The lighting device according to claim 4, wherein a pair of the reflection sheets facing each other with the optical path interposed therebetween are provided. The illuminating device according to claim 1, wherein the reflectance of the reflective sheet at a wavelength of 550 nm is 70% or more. The lighting device according to claim 1, wherein the reflection sheet is made of a regular reflection material. The lighting device according to claim 1, wherein the reflection sheet is made of a diffuse reflection material. The illuminating device according to claim 1, wherein the glass member includes a plurality of different types of the fluorescent substances. The lighting device according to claim 1, wherein the light source emits visible light. The light source is a blue light source;
The lighting device according to claim 1, wherein the fluorescent material includes a fluorescent material that emits red light and a fluorescent material that emits green light. The lighting device according to claim 1, further comprising a plurality of the light sources that emit light having different wavelengths. The lighting device according to claim 1, wherein the light source and the sealing resin layer are accommodated in a package. The lighting device according to claim 1, wherein the sealing resin layer and the glass member are in contact with each other. The lighting device according to claim 1, wherein an adhesive resin layer is provided between the sealing resin layer and the glass member. The lighting device according to claim 15, wherein the reflection sheet reflects a part of the light that has passed through the adhesive resin layer and enters the glass member. The optical component is a light guide plate;
The lighting device according to claim 1, wherein the light incident surface is an end surface of the light guide plate. The lighting device according to claim 1, wherein the light source is an LED. The lighting device according to claim 1, wherein the sealing resin layer includes a light-transmitting resin. A liquid crystal panel and a lighting device on the back side of the liquid crystal panel,
The lighting device includes:
A light source;
A glass member containing a fluorescent material that absorbs at least part of the light from the light source and emits light having a wavelength different from the wavelength of the light from the light source;
A sealing resin layer between the light source and the glass member;
An optical member having a light incident surface facing the light source with the glass member in between;
And a reflection sheet that reflects at least a part of the light that has passed through the glass member and enters the light incident surface.

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