Lighting and display devices

Abstract

To improve color uniformity within a surface. [Solution] This display device includes a front housing, a rear housing, a display panel held by a middle chassis between the front and rear housings, at least one light source provided on a light source substrate located between the front and rear housings and emitting light in a first wavelength range, a light emitter including particulate quantum dots with a major axis of 1 nm or more and 100 nm or less and embedded in a cured resin so as to be able to receive light, an optical element held by the middle chassis and including a light incident surface facing the light emitter and a planar light exit surface facing the display panel, a reflective member provided between the display panel and the rear housing, and a fixing member surrounding the light source and having a heat dissipation member attached thereto.

Description

[Technical Field]

[0001] The present disclosure relates to an illumination device suitable for a surface light source, and a display device including the same. [Background technology]

[0002] In lighting devices used as backlights for liquid crystal display devices, for example, an edge-type configuration in which a light source is disposed near the side surface (light incident surface) of a light guide plate is known. In edge-type lighting devices, light from the light source is incident on the side surface of the light guide plate and emitted from the front surface of the light guide plate.

[0003] For example, Patent Document 1 describes the provision of a dichroic mirror surrounding the rear of a cold cathode fluorescent lamp, which is a light source, in order to suppress deterioration of the light guide plate. The dichroic mirror selectively transmits ultraviolet light and selectively reflects at least visible light. An ultraviolet absorbing sheet is disposed behind the dichroic mirror, which absorbs the ultraviolet light that passes through the dichroic mirror. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-157468 Summary of the Invention

[0005] In general, it is desirable for a lighting device to have high light utilization efficiency.

[0006] Therefore, it is desirable to provide an illumination device that can improve the light utilization efficiency, and a display device including the same.

[0007] An illumination device according to one embodiment of the present disclosure includes a light source that generates light of a first wavelength, a light emitter that wavelength converts the light of the first wavelength into light of a second wavelength different from the first wavelength, and a wavelength-selective filter that is provided on the light-entering side of the light emitter and transmits light of the first wavelength and reflects light of the second wavelength.

[0008] In an illumination device according to an embodiment of the present disclosure, light of a first wavelength from a light source passes through a wavelength-selective filter and travels toward a light emitter. The light that strikes the light emitter is wavelength-converted by the light emitter to become light of a second wavelength. The light that does not strike the light emitter passes through as is.

[0009] In this case, the wavelength-selective filter transmits light of the first wavelength and reflects light of the second wavelength, so that the light of the first wavelength emitted from the light source can pass through the wavelength-selective filter with almost no attenuation. Furthermore, of the light of the second wavelength that collides with the light emitter and is wavelength-converted, the light that goes out backward is reflected by the wavelength-selective filter and emitted forward as reflected light, for effective use.

[0010] A display device according to one embodiment of the present disclosure includes a liquid crystal panel and an illumination device on the back side of the liquid crystal panel, the illumination device including a light source that generates light of a first wavelength, an illuminant that wavelength converts the light of the first wavelength to light of a second wavelength different from the first wavelength, and a wavelength-selective filter that is provided on the light-receiving side of the illuminant and transmits light of the first wavelength and reflects light of the second wavelength.

[0011] In the display device according to the embodiment of the present disclosure, the liquid crystal panel selectively transmits light of a first wavelength or light of a second wavelength from an illumination device, thereby displaying an image.

[0012] According to an embodiment of the present disclosure, a lighting device includes a wavelength-selective filter on the light-receiving side of a light emitter, which transmits light of a first wavelength and reflects light of a second wavelength, thereby improving light utilization efficiency. Therefore, by configuring a display device using this lighting device, it is possible to reduce power consumption. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram illustrating a schematic configuration of a main part of an illumination device according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram schematically illustrating the transmission characteristics of the wavelength-selective filter shown in FIG. [Figure 3] FIG. 2 is a diagram schematically illustrating the reflection characteristics of the wavelength-selective filter shown in FIG. [Figure 4] FIG. 1 is a diagram schematically illustrating the transmission characteristics of a wavelength-selective filter used in a display device. [Figure 5] FIG. 1 is a diagram schematically illustrating the reflection characteristics of a wavelength-selective filter used in a display device. [Figure 6] 2 is an enlarged cross-sectional view showing an example of the arrangement relationship between the light emitter and the wavelength selective filter shown in FIG. 1. FIG. [Figure 7] 1. FIG. 4 is a cross-sectional view showing another example of the arrangement relationship between the light emitter and the wavelength selective filter shown in FIG. [Figure 8] 2 is a diagram for explaining the operation of the lighting device shown in FIG. 1. FIG. [Figure 9] FIG. 10 is an enlarged cross-sectional view illustrating an example of the arrangement relationship between light emitters and wavelength selective filters in an illumination device according to a second embodiment of the present disclosure. [Figure 10] 10 is a cross-sectional view illustrating another example of the arrangement relationship between the light emitter and the wavelength selective filter illustrated in FIG. 9. FIG. [Figure 11] FIG. 10 is a perspective view illustrating an overall configuration of an illumination device according to a third embodiment of the present disclosure. [Figure 12] 12 is a cross-sectional view illustrating the arrangement relationship of the light source, the light emitter, the wavelength selective filter, and the light guide plate shown in FIG. 11. FIG. [Figure 13] 12 is a diagram for explaining the operation of the lighting device shown in FIG. [Figure 14] 14 is a perspective view showing a bundle of rays traveling from the light source shown in FIG. 13 toward the light incident surface of the light guide plate. [Figure 15]10 is a cross-sectional view showing the arrangement relationship of a light source, a light emitter, a wavelength selective filter, and a light guide plate in an illumination device according to Modification 2. FIG. [Figure 16] FIG. 10 is a perspective view illustrating an appearance of a display device according to a fourth embodiment of the present disclosure. [Figure 17] FIG. 17 is an exploded perspective view of the main body shown in FIG. 16. [Figure 18] FIG. 18 is an exploded perspective view of the panel module shown in FIG. [Figure 19] FIG. 10 is a perspective view illustrating the appearance of a first application example of the display device according to the above embodiment, as viewed from the front side. [Figure 20] 1 is a perspective view illustrating the appearance of a display device according to Application Example 1, as viewed from the rear side. [Figure 21] FIG. 10 is a perspective view illustrating the appearance of Application Example 2 of the display device as viewed from the front side. [Figure 22] FIG. 10 is a perspective view illustrating the appearance of Application Example 2 of the display device as viewed from the back side. [Figure 23] FIG. 10 is a perspective view illustrating the appearance of Application Example 3 of the display device as viewed from the front side. [Figure 24] FIG. 11 is a perspective view illustrating the appearance of Application Example 3 of the display device as viewed from the back side. [Figure 25] FIG. 10 is a perspective view illustrating the appearance of a fourth application example of the display device. [Figure 26] FIG. 10 is a perspective view illustrating the appearance of a fifth application example of the display device. [Figure 27] FIG. 10 is a front view illustrating the appearance of Application Example 6 of the display device in a closed state. [Figure 28] FIG. 10 is a front view illustrating the appearance of Application Example 6 of the display device in an open state. [Figure 29] FIG. 11 is a perspective view illustrating the appearance of an application example 7 of the lighting device. [Figure 30] FIG. 10 is a perspective view illustrating the appearance of an application example 8 of the lighting device. [Figure 31] FIG. 10 is a perspective view illustrating the appearance of an application example 9 of the lighting device. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be made in the following order. 1. First embodiment (illumination device; example in which a wavelength-selective filter is provided on the light-receiving side of a light-emitting body) 2. Modification 1 (Lighting device; example in which the light emitter includes a sulfide phosphor) 3. Second embodiment (illumination device; example in which the surface of the container on which the wavelength selective filter is provided is curved convexly toward the light source) 4. Third embodiment (lighting device; backlight) 5. Modification 2 (Illumination Device: Combination of the Second and Third Embodiments) 6. Fourth embodiment (display device; liquid crystal display device) 7. Electronic equipment (examples of display device applications) 8. Lighting equipment (application examples of lighting devices)

[0015] (First embodiment) 1 shows a schematic configuration of the main components of an illumination device according to a first embodiment of the present disclosure. The illumination device 1 is used as a backlight that illuminates a transmissive liquid crystal panel from behind, or as a lighting device indoors, and includes, for example, a light source 10, a light emitter 20, and a wavelength-selective filter 30.

[0016] In this embodiment, in the arrangement direction A1 of the light source 10, the light emitter 20, and the wavelength selective filter 30, the direction from the light source 10 toward the light emitter 20 is called the forward direction A1F, and the direction from the light emitter 20 toward the light source 10 is called the backward direction A1R.

[0017] The light source 10 generates light v11 and v12 of a specific wavelength (first wavelength λ1). The light source 10 is, for example, a point light source, and specifically, is configured by an LED (Light Emitting Diode).

[0018] The light emitter 20 includes a phosphor (fluorescent material) such as a fluorescent pigment or fluorescent dye, or a light emitter having a wavelength conversion function, such as quantum dots. The light emitter 20 is excited by light v11 and v12 of a first wavelength, and emits light by wavelength-converting the light v11 and v12 of the first wavelength into light v21 of a different wavelength (second wavelength λ2) different from the first wavelength, based on the principle of fluorescence, etc. In Figure 1, the light v11 and v12 of the first wavelength are represented by solid lines, and the light v21 of the second wavelength is represented by a dashed line.

[0019] The first wavelength λ1 and the second wavelength λ2 are not particularly limited, but for example, in the case of use in a display device, the first wavelengths v11 and v12 are blue light (for example, wavelengths of about 440 to 460 nm), and the second wavelength v21 is red light (for example, wavelengths of 620 to 750 nm) or green light (for example, wavelengths of 495 to 570 nm). That is, the light source 10 is a blue light source, and the light emitter 20 wavelength-converts the blue light to red light or green light.

[0020] The light emitter 20 preferably includes quantum dots. Quantum dots are particles with a major axis of approximately 1 nm to 100 nm and have discrete energy levels. Since the energy state of quantum dots depends on their size, it is possible to freely select the emission wavelength by changing the size. Furthermore, the emission light of quantum dots has a narrow spectral width. The color gamut can be expanded by combining light with such sharp peaks. Therefore, by using quantum dots in the light emitter 20, it is possible to easily expand the color gamut. Furthermore, quantum dots have high responsiveness, allowing for efficient use of the light from the light source 10. In addition, quantum dots are highly stable. Quantum dots are, for example, compounds of Group 12 and Group 16 elements, compounds of Group 13 and Group 16 elements, or compounds of Group 14 and Group 16 elements, such as CdSe, CdTe, ZnS, CdS, PbS, PbSe, or CdHgTe.

[0021] 1, for simplicity, the light emitters 20 are shown as particles such as quantum dots, but it goes without saying that the light emitters 20 are not necessarily limited to particles. Also, in FIG. 1, the region where the light emitters 20 are arranged (hereinafter referred to as the light emitter arrangement region 21) is shown surrounded by a dotted line.

[0022] The wavelength-selective filter 30 is provided on the light-receiving side 20A of the light emitter 20, and transmits light of the first wavelengths v11 and v12 and reflects light of the second wavelength v21, thereby enabling the lighting device 1 to improve light utilization efficiency.

[0023] Here, the light incident side 20A of the light emitter 20 refers to a spatial region on the rear A1R side (light source 10 side) of the light emitter arrangement region 21 in the arrangement direction A1. Specifically, the light incident side 20A of the light emitter 20 refers to a region between the light source 10 and the light emitter arrangement region 21.

[0024] Fig. 2 is a schematic diagram showing an example of the transmission characteristic 30T of the wavelength-selective filter 30. Fig. 2 also shows the spectrum SB of blue light. As shown in Fig. 2, when the light of the first wavelengths v11 and v12 is, for example, blue light, the wavelength-selective filter 30 has high transmittance in a wavelength range of, for example, about 500 nm or less, which includes the wavelength band of blue light.

[0025] Fig. 3 is a schematic diagram showing an example of the reflection characteristic 30R of the wavelength-selective filter 30. Fig. 3 also shows the spectrum SG of green light. As shown in Fig. 3, when the second wavelength light v21 is, for example, green light, the wavelength-selective filter 30 has high reflectance in a wavelength range of, for example, about 500 nm or more, which includes the wavelength band of green light.

[0026] 4 and 5 are schematic diagrams illustrating an example of the transmission characteristic 30TD and the reflection characteristic 30RD of the wavelength-selective filter 30 used in a display device. The red light spectrum SR, the green light spectrum SG, and the blue light spectrum SB are also shown in FIGS. 4 and 5. As shown in FIGS. 4 and 5, the wavelength-selective filter 30 has high transmittance in a wavelength range of, for example, about 500 nm or less, including the wavelength band of the first wavelengths of light v11 and v12, i.e., blue light, and has high reflectance in a wavelength range of, for example, about 500 nm or more, including the wavelength band of the second wavelength of light v21, i.e., red light or green light.

[0027] Such a wavelength-selective filter 30 is made of, for example, a dielectric multilayer film. Specifically, the wavelength-selective filter 30 has a configuration in which a large number of dielectric layers, each having a thickness of about 1 / 4 (one-fourth) the second wavelength and different refractive indices, are stacked, and the wavelength-selective filter 30 is capable of selectively reflecting the light v21 of the second wavelength and selectively transmitting the light v11 and v12 of the first wavelengths.

[0028] Fig. 6 shows an enlarged view of an example of the relative positions of the light emitter 20 and the wavelength selective filter 30 shown in Fig. 1. The light emitter 20 is preferably housed and sealed in a tubular container (capillary) 22 made of glass or the like. This is because it makes it possible to suppress changes in the characteristics of the wavelength conversion member 30 caused by moisture and oxygen in the air and to make it easier to handle.

[0029] The container 22 has a rectangular parallelepiped shape (including shapes that can be essentially called a rectangular parallelepiped even if they have slight deformations such as rounded edges), and is disposed with one face of this rectangular parallelepiped facing the light source 10. The container 22 has a hollow portion therein that serves as a storage section 23 for the light emitter 20. It goes without saying that this storage section 23 corresponds to the light emitter placement area 21 described above.

[0030] The wavelength-selective filter 30 is preferably provided on the outer surface 22A on the light-entering side of the container 22. Because the light emitter 20 is a divergent light source, it is desirable to place the wavelength-selective filter 30 in close proximity to the light emitter 20 in order to further increase the light utilization efficiency. In addition, by eliminating a gap between the container 22 and the wavelength-selective filter 30, it is possible to reduce light leakage and prevent a decrease in light utilization efficiency. Furthermore, coating on glass is easy, and the wavelength-selective filter 30 can be easily formed.

[0031] It is preferable that the width W30 of the wavelength-selective filter 30 is larger than the width W23 of the housing portion 23. This reduces the amount of light of the first wavelength that passes through the glass portion 22B of the container 22 without passing through the housing portion 23, thereby improving the uniformity of color within the surface.

[0032] The wavelength-selective filter 30 is preferably provided on at least the surface 22C of the container 22 that faces the light source 10. As a result, the width W30 of the wavelength-selective filter 30 is equal to or substantially equal to the width W23 of the housing portion 23 plus twice the thickness T22 of the container 22. This makes it possible to reliably make the width W30 of the wavelength-selective filter 30 larger than the width W23 of the housing portion 23.

[0033] 7, it is preferable that the wavelength-selective filter 30 extends beyond the surface 22C of the container 22 facing the light source 10 to at least a portion (partial or all) of the surfaces 22D and 22E adjacent to the facing surface 22C, because this makes it possible to capture light that sneaks around to the adjacent surfaces 22D and 22E.

[0034] The light emitter 20 and the wavelength selective filter 30 shown in FIG. 6 or FIG. 7 can be manufactured, for example, as follows.

[0035] First, for example, a fluorescent substance or quantum dots is mixed with an ultraviolet-curable resin, the resulting mixture is placed in a container 22 such as a glass tube, one side of the container 22 is sealed, and the resin is cured by irradiating it with ultraviolet light to form a resin-like light-emitting body 20 with a certain degree of viscosity. Next, a dielectric multilayer film is coated by sputtering on the outer surface 22A of the light-incident side of the container 22, forming the wavelength-selective filter 30. In this case, surface treatment of the glass tube of the container 22 is not required; simply cleaning the surface is sufficient.

[0036] In this lighting device 1, when the light source 10 generates light v11 and v12 of a first wavelength, this light v11 and v12 passes through the wavelength-selective filter 30 and travels toward the light emitter 20. The light v12 that hits the light emitter 20 is wavelength-converted by the light emitter 20 and becomes light v21 of a second wavelength λ2. The light v11 that does not hit the light emitter 20 passes through as is.

[0037] Here, the wavelength-selective filter 30 transmits the light of the first wavelength v11 and v12 and reflects the light of the second wavelength v21, so that the light of the first wavelength v11 and v12 emitted from the light source 10 can pass through the wavelength-selective filter 30 with almost no attenuation and proceed toward the light emitter 20.

[0038] When the light v12 hits the light emitter 20, the light emitter 20 emits wavelength-converted light v21 of a second wavelength in all directions from the light emitter 20, as shown in Fig. 8. Some light, like light v21, leaves the light emitter 20 at approximately the same angle as when the light entered, while other light beams, like light v22, exit backward A1R (towards the wavelength-selective filter 30).

[0039] Here, the wavelength-selective filter 30 transmits light of the first wavelength v11 and v12 and reflects light of the second wavelength v21 and v22, so that light v22 is reflected by the wavelength-selective filter 30 and emitted forward A1F as reflected light v23, where it is effectively utilized.

[0040] As described above, in this embodiment, the wavelength-selective filter 30 that transmits the light beams v11 and v12 of the first wavelengths and reflects the light beams v21 and v22 of the second wavelengths is provided on the light incident side 20A of the light emitter 20. Therefore, nearly half of the light wavelength-converted by the light emitter 20 is reflected by the wavelength-selective filter 30, and the light is emitted forward A1F, thereby improving the light utilization efficiency.

[0041] Furthermore, by effectively utilizing light, it is possible to improve the luminous efficiency of the entire system and increase the brightness of the lighting device 1. Furthermore, by effectively utilizing light, it is possible to improve the luminous efficiency of the entire system and reduce the power of the light source 10, thereby reducing the power consumption of the lighting device 1. In addition, by effectively utilizing light, it is possible to improve the luminous efficiency of the entire system and reduce the number of LEDs and other elements that make up the light source 10, thereby reducing costs.

[0042] In particular, the light emitter 20 is housed in a container 22, and a wavelength selective filter 30 is provided on the outer surface 22A of the container 22 on the light incident side, thereby making it possible to reduce the distance between the light emitter 20 and the wavelength selective filter 30, reduce light leakage, and further increase the light utilization efficiency.

[0043] In particular, a storage section 23 for the light emitter 20 is provided inside the container 22, and the width W30 of the wavelength selective filter 30 is made larger than the width W23 of the storage section 23, thereby reducing leakage of the first wavelength light ν11, ν12 and improving the color uniformity within the surface.

[0044] (Variation 1) In the first embodiment, the light-emitting body 20 contains a fluorescent material or quantum dots. However, the first embodiment can also be suitably applied to a case where the light-emitting body 20 contains a sulfide phosphor. Sulfide phosphors are chemically unstable, easily deteriorate in the atmosphere, and are difficult to handle. Therefore, even when a sulfide phosphor is used as the light-emitting body 20, by sealing the light-emitting body 20 in the container 22 as in the first embodiment, it is possible to suppress changes in characteristics due to moisture and oxygen in the atmosphere and to obtain the effect of making it easier to handle.

[0045] An example of a sulfide phosphor that emits green light as the second wavelength light v21 is SrGa2S4:Eu (strontium thiogallate). An example of a sulfide phosphor that emits red light as the second wavelength light v21 is CaS:Eu (calcium sulfide).

[0046] (Second embodiment) 9 is an enlarged view showing an example of the arrangement relationship between the light emitter 20 and the wavelength-selective filter 30 in the lighting device 2 according to the second embodiment of the present disclosure. This lighting device 2 has the same configuration, action, and effect as the first embodiment, except that the light-collecting effect is enhanced by curving the surface 22C of the container 22 facing the light source 10 convexly toward the light source 10. Therefore, the same reference numerals will be used to denote corresponding components in the following description.

[0047] The light source 10, the light emitter 20, the light emitter arrangement region 21, and the wavelength selective filter 30 are configured in the same manner as in the first embodiment.

[0048] As described above, in the container 22, the surface 22C facing the light source 10 is curved convexly toward the light source 10. This allows the inner surface of the facing surface 22C to function as a concave mirror, improving the light collection effect and further increasing the light utilization efficiency.

[0049] The wavelength selective filter 30 is preferably provided on the outer surface 22A of the container 22 on the light incident side, as in the first embodiment.

[0050] The width W30 of the wavelength selective filter 30 is preferably larger than the width W23 of the housing portion 23, as in the first embodiment.

[0051] As in the first embodiment, the wavelength selective filter 30 is preferably provided on at least the surface 22C of the container 22 facing the light source 10.

[0052] 10, the wavelength-selective filter 30 preferably extends beyond the surface 22C of the container 22 facing the light source 10 to part or all of the surfaces 22D and 22E adjacent to the facing surface 22C, because this makes it possible to capture light that leaks to the adjacent surfaces 22D and 22E.

[0053] In this lighting device 2, the surface 22C of the container 22 facing the light source 10 is curved convexly toward the light source 10, so that the inner surface of the facing surface 22C functions as a concave mirror. Therefore, the light v22 of the second wavelength is reflected by the wavelength selective filter 30, and the reflected light v23 tends to be collected inside and is used more effectively.

[0054] (Third embodiment) 11 shows the overall configuration of an illumination device according to a third embodiment of the present disclosure. This illumination device 3 includes the illumination device 1 of the first embodiment as its main components. That is, the illumination device 3 includes a light guide plate 40, a reflecting member 50, and an optical sheet 60 in addition to the light source 10, the light emitter 20, and the container 22 provided with the wavelength-selective filter 30 described in the first embodiment. The light guide plate 40 corresponds to a specific example of an "optical component" in the present disclosure.

[0055] In the following embodiments, the stacking direction of the optical sheet 60, the light guide plate 40, and the reflecting member 50 is referred to as the Z direction (front-rear direction), the left-right direction on the main surface (widest surface) of the light guide plate 40 is referred to as the X direction, and the up-down direction is referred to as the Y direction.

[0056] The light source 10 is configured in the same manner as in the first embodiment. The light source 10 is sealed in a package 11 (not shown in FIG. 11, see FIG. 12) and mounted on a light source substrate 12, and is arranged opposite a light incident surface 40A of a light guide plate 40. The light source substrate 12 has, for example, an elongated rectangular parallelepiped shape, and is arranged in a line in the longitudinal direction of the light source substrate 12.

[0057] 11, the light incident surfaces 40A are the left and right end surfaces of the light guide plate 40. Therefore, the arrangement direction A1, the front side A1F, and the rear side A1R in the first embodiment are parallel to the left-right direction X in FIG.

[0058] The light emitter 20 and the wavelength conversion member 30 are configured in the same manner as in the first embodiment.

[0059] The light guide plate 40 guides light from the light source 10 from a light incident surface 40A to a light exit surface 40B, and is made mainly of a transparent thermoplastic resin such as polycarbonate resin (PC) or acrylic resin (e.g., PMMA (polymethyl methacrylate)). The light guide plate 40 has a rectangular parallelepiped shape consisting of a pair of main surfaces (top and bottom surfaces) facing each other in the front-to-rear direction (z direction) and four end surfaces (side surfaces) in contact with the main surfaces.

[0060] As described above, the left and right end faces of the light guide plate 40 serve as light incident surfaces 40A onto which light from the light source 10 is incident. Note that the light incident surface 40A may be only one of the left and right end faces of the light guide plate 40. Alternatively, the light incident surface 40A may be on three end faces of the light guide plate 40, or all four end faces.

[0061] The surface of the light guide plate 40 is a light exit surface 40B that exits light that has entered through the light incident surface 40A. The light exit surface 40B (surface) and the bottom surface of the light guide plate 40 have a planar shape that corresponds to, for example, an illuminated object (for example, a liquid crystal panel 122 described below) that is placed on the light exit surface 40B side of the light guide plate 40.

[0062] A pattern (not shown in FIG. 11, see FIG. 13) having diffuse reflection properties is printed on the bottom surface 40D of the light guide plate 40. This pattern reflects light traveling toward the bottom surface 40D of the light guide plate 40 toward the light exit surface 40B of the light guide plate 40.

[0063] The reflecting member 50 is a plate- or sheet-like member provided on the bottom surface 40D side of the light guide plate 40, and reflects, toward the light guide plate 40, light that leaks out from the light source 10 to the bottom surface 40D side of the light guide plate 40 or light that has been emitted from the inside of the light guide plate 40 to the bottom surface 40D side. The reflecting member 50 has functions such as reflection, diffusion, and scattering, which enable efficient use of light from the light source 10 and increased front brightness.

[0064] The reflective member 50 is made of, for example, foamed PET (polyethylene terephthalate), silver-deposited film, multilayer reflective film, or white PET. To provide specular reflection (mirror reflection), the surface of the reflective member 50 is preferably treated with silver deposition, aluminum deposition, or multilayer reflective film. To impart a fine shape to the reflective member 50, the reflective member 50 may be integrally formed by a method such as heat press molding or melt extrusion molding using a thermoplastic resin. Alternatively, the reflective member 50 may be formed by applying an energy ray (e.g., ultraviolet) curable resin to a substrate made of, for example, PET, and then transferring the shape to the energy ray curable resin. Examples of thermoplastic resins include polycarbonate resin, acrylic resin such as PMMA (polymethyl methacrylate resin), polyester resin such as polyethylene terephthalate, amorphous copolymer polyester resin such as MS (methyl methacrylate-styrene copolymer), polystyrene resin, and polyvinyl chloride resin. Furthermore, when transferring the shape to an energy ray (e.g., ultraviolet) curable resin, the substrate may be glass.

[0065] The optical sheet 60 is provided on the light exit surface 40B (front surface) side of the light guide plate 40, and includes, for example, a diffusion plate, a diffusion sheet, a lens film, a polarization separation sheet, etc. Fig. 11 shows only one of the multiple optical sheets 60. By providing such an optical sheet 60, it becomes possible to direct light emitted obliquely from the light guide plate 40 toward the front, thereby further increasing the front brightness.

[0066] Figure 12 shows the relative positions of the light source 10, light emitter 20, wavelength selective filter 30 and light guide plate 40 shown in Figure 11, and shows a cross section passing through the light emitting center 10A of the light source 10 and perpendicular to the light incident surface 40A.

[0067] The light source 10 is disposed opposite the light incident surface 40A of the light guide plate 40, and a container 22 containing the light emitter 20 and a wavelength selective filter 30 are disposed between the light source 10 and the light incident surface 40A. The light source 10, container 22, and wavelength conversion member 30 are held by, for example, a fixing member (holder) 70. A reflecting member 50 is laid on the bottom surface 40D side of the light guide plate 40.

[0068] The light-emitting body arrangement region 21 preferably crosses the region S1 surrounded by the light paths of the light v31 and v32 incident from the light source 10 to the ends (upper end 40E and lower end 40F) of the light incident surface 40A and the light incident surface 40A, and extends to an outer region S2 beyond this region S1. By arranging the light-emitting body 20 in this manner, it is possible to improve the uniformity of color within the surface.

[0069] The container 22 and the storage section 23 are configured in the same manner as in the first embodiment.

[0070] The fixing member 70 is made of a highly reflective polycarbonate resin, a polyamide resin (for example, "Genesta (product name)" manufactured by Kuraray Co., Ltd.), or the like, and has, for example, a first fixing portion 71 that holds the light source 10, and a second fixing portion 72 and a third fixing portion 73 that hold the container 22 of the light-emitting body 20.

[0071] The first fixing portion 71 is a portion to which the light source substrate 12 on which the light source 10 is mounted is attached, and faces the light incident surface 40A. An opening 71C penetrating from the outer surface 71A to the inner surface 71B is provided in the center of the first fixing portion 71. A seat 71D is provided on the outer surface 71A side of the opening 71C by recessing the periphery of the opening 71C in a stepped manner. Therefore, by fixing the light source substrate 12 to the seat 71D, the package 11 on which the light source 10 is mounted fits gently into the opening 71C. Note that the seat 71D may not necessarily be provided depending on the dimensions of the light source substrate 12. Furthermore, it is desirable that part or all of the inner surface 71B be an inclined surface to increase the utilization efficiency of light from the light source 10.

[0072] The second fixing portion 72 and the third fixing portion 73 sandwich the upper and lower ends of the container 22 of the light-emitting body 20 and fix the container 22 so that its position and orientation do not shift. The second fixing portion 72 and the third fixing portion 73 extend, for example, from the upper and lower ends of the first fixing portion 71 in a direction substantially perpendicular to the first fixing portion 71. Therefore, the cross-sectional shape of the first fixing portion 71 to the third fixing portion 73 has, for example, three sides of a rectangle. The upper and lower ends of the container 22 are fixed, for example, to fixing protrusions (not shown) provided on the second fixing portion 72 and the third fixing portion 73. The upper and lower ends of the container 22 may be fixed by other methods, such as double-sided adhesive tape.

[0073] Furthermore, the end of the light guide plate 40 and the end of the reflecting member 50 are sandwiched and held between the tip of the second fixing portion 72 and the tip of the third fixing portion 73. It is sufficient that the second fixing portion 72 and the third fixing portion 73 sandwich at least the upper and lower ends of the container 22, and the end of the light guide plate 40 and the end of the reflecting member 50 can also be held by other members (described later).

[0074] A heat dissipation member (heat spreader) (not shown) is attached to the outside of the fixing member 70, particularly around the light source 10. Furthermore, the entire lighting device 2 including the light source 10, fixing member 70, and heat dissipation member (not shown) is housed in a housing (not shown in FIGS. 11 and 12; see, for example, rear housing 124 in FIG. 18).

[0075] 13, in this lighting device 3, when the light source 10 generates light v11, v12, and v13 of a first wavelength, this light v11 to v13 passes through the wavelength-selective filter 30 and enters the container 22. Here, the wavelength-selective filter 30 transmits the light v11 to v13 of the first wavelength and reflects the light v21 of the second wavelength, so the light v11 to v13 of the first wavelength emitted from the light source 10 passes through the wavelength-selective filter 30 with almost no attenuation, enters the container 22, and can proceed toward the light emitter 20.

[0076] The light v11 and v12 that entered the container 22 but did not collide with the light emitter 20 passes through the container 22 and enters the light guide plate 40. Since the bottom surface 40D of the light guide plate 40 is provided with a pattern 41 having diffuse reflection properties, the light v12 is reflected by the pattern 41 and travels toward the top of the light guide plate 40, and is emitted from the light emitting surface 40B. Before reaching the pattern 41, the light v11 is totally reflected by the light emitting surface 40B of the light guide plate 40, travels toward the bottom surface 40D, is reflected by the pattern 41 and is emitted from the light emitting surface 40B. These emitted lights pass through the optical sheet 50 and are emitted is observed as

[0077] On the other hand, the light v13 that enters the container 22 and collides with the light emitter 20 is wavelength converted by the light emitter 20 to become light v21 and v22 of the second wavelength λ2.

[0078] Light v21 that collides with the light emitter 20 and is emitted forward A1F passes through the container 22, enters the light incident surface 40A of the light guide plate 40, is reflected by the pattern 41, and exits from the light exit surface 40B. This exit light passes through the optical sheet 50 and is observed as light emission.

[0079] On the other hand, there is also light v22 that collides with the light emitter 20 and is emitted backward A1R. Here, the wavelength-selective filter 30 transmits the light v11 and v12 of the first wavelength and reflects the light v21 and v22 of the second wavelength, so the light v22 is reflected by the wavelength-selective filter 30 and emitted forward A1F as reflected light v23, passes through the container 22, and is incident on the light incident surface 40A of the light guide plate 40. The light v23 is reflected by the pattern 41 and exits from the light exit surface 40B. This exit light passes through the optical sheet 50 and is observed as light emission and is effectively utilized.

[0080] Furthermore, because the light source 10 is a point light source as described above, the light emitted from the light source 10 spreads 360° in all directions from the light-emitting center 10A. As shown in FIG. 14, the light-emitting body arrangement area 21 and the light incident surface 40A are long in the left-right direction, so the spread of light in the left-right direction does not pose a particular problem. However, some of the light that spreads in the vertical direction may deviate above the upper end 40E of the light incident surface 40A or below the lower end 40F.

[0081] 12, the light-emitting body-installed region 21 crosses the region S1 surrounded by the light paths of the light beams v31 and v32 incident from the light source 10 on the ends (upper end 40E and lower end 40F) of the light incident surface 40A and the light incident surface 40A. In other words, the light-emitting body-installed region 21 intersects (crosses) the region S1 in a direction parallel to the light incident surface 40A. Therefore, the light that passes through the region S1 and enters the light incident surface 40A can be wavelength-converted by the light-emitting body 20.

[0082] Furthermore, the light emitter-arranged region 21 extends beyond region S1 to an outer region S2. In other words, the light emitter-arranged region 21 is provided so as to extend beyond region S1 and overlap with the outer region S2. Therefore, even light that leaves the light source 10, spreads in the vertical direction, and travels outside region S1 can be captured to some extent by the light emitter 20 and undergo wavelength conversion. Therefore, in this lighting device 2, the amount of light from the light source 10 that does not pass through the light emitter-arranged region 21, i.e., the light that is not wavelength-converted by the light emitter 20, is reduced, improving the uniformity of color within the surface.

[0083] In this embodiment, as in the first embodiment, a wavelength-selective filter 30 is provided on the light-receiving side 20A of the light-emitting body 20, which transmits light of the first wavelengths v11 and v12 and reflects light of the second wavelength v21, thereby making it possible to improve the light utilization efficiency.

[0084] Furthermore, the light-emitting body arrangement region 21 crosses the region S1 surrounded by the light paths of the light v1 and v2 incident from the light source 10 on the ends (upper end 40E and lower end 40F) of the light incident surface 40A and the light incident surface 40A, and extends to an outer region S2 beyond this region S1. This makes it possible to reduce the amount of light from the light source 10 that does not pass through the light-emitting body arrangement region 21, i.e., the light that is not wavelength-converted by the light-emitting body 20, thereby improving the uniformity of color within the surface.

[0085] (Variation 2) In the second embodiment, the lighting device 3 includes the lighting device 1 of the first embodiment as a main part thereof. However, as shown in Fig. 15, it is also possible to configure the lighting device 4 including the lighting device 2 of the second embodiment as a main part thereof, and to curve the surface 22C of the container 22 facing the light source 10 convexly toward the light source 10.

[0086] (Fourth embodiment) 16 shows the appearance of a display device 101 according to a fourth embodiment of the present disclosure. This display device 101 is used, for example, as a thin television device, and has a configuration in which a flat main body 102 for displaying images is supported by a stand 103. Note that the display device 101 is used as a floor-mounted type by placing it on a horizontal surface such as a floor, shelf, or stand with the stand 103 attached to the main body 102, but it can also be used as a wall-mounted type by removing the stand 103 from the main body 102.

[0087] FIG. 17 is an exploded view of the main body 102 shown in FIG. 16. The main body 102 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 front peripheral edge of the panel module 112, and a pair of speakers 114 are arranged below it. 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 of the panel module 112, and a mounting bracket 117 is fixed to the rear surface of the panel module 112. The mounting bracket 117 is used to attach a wall-mount bracket, boards, etc., and the stand 103. The rear exterior member 113 covers the rear and side surfaces of the panel module 112.

[0088] Fig. 18 is an exploded view of the panel module 112 shown in Fig. 16. The panel module 112 has, for example, from the front side (viewer side), a front housing (top chassis) 121, a liquid crystal panel 122, a frame-shaped member (middle chassis) 80, an optical sheet 60, a light guide plate 40, a reflecting member 50, a rear housing (back chassis) 124, a balancer board 125, a balancer cover 126, and a timing controller board 127, in this order.

[0089] 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 a COF (Chip On Film), that connects these together. The frame member 123 is a frame-shaped resin part that holds the liquid crystal panel 122 and the optical sheet 50. The rear housing 124 is a metal part made of iron (Fe) or the like that houses the liquid crystal panel 122, the middle housing 123, and the lighting device 3. The balancer board 125 controls the lighting device 3 and, as shown in FIG. 16, is mounted on the rear surface of the rear housing 124 and is covered by a balancer cover 126. A timing controller board 127 is also mounted on the rear surface of the rear housing 124.

[0090] In this display device 101, an image is displayed by selectively transmitting light from the illumination device 3 through the liquid crystal panel 122. As described in the third embodiment, this display device 101 is provided with the illumination device 3 having improved light utilization efficiency, and therefore the brightness of the display device 101 is improved and power consumption is reduced.

[0091] In the above embodiment, the display device 101 is described as being equipped with the lighting device 3 according to the third embodiment. However, it goes without saying that the display device 101 may be equipped with the lighting device 4 according to the modified example 2 instead of the lighting device 3 according to the third embodiment.

[0092] (Example of application of display devices) Hereinafter, an example of application of the above-described display device 101 to electronic devices will be described. Examples of electronic devices include television devices, digital cameras, notebook personal computers, portable terminal devices such as mobile phones, and video cameras. In other words, the above-described display device can be applied to electronic devices in all fields that display externally input video signals or internally generated video signals as images or videos.

[0093] (Application example 1) 19 and 20 each show the appearance of an electronic book 210 to which the display device 101 of the above embodiment is applied. The electronic book 210 has, for example, a display unit 211 and a non-display unit 212, and the display unit 211 is configured by the display device 101 of the above embodiment.

[0094] (Application example 2) 21 and 22 show the appearance of a smartphone 220 to which the display device 101 of the above embodiment is applied. This smartphone 220 has, for example, a display unit 221 and an operation unit 222 on the front side and a camera 223 on the back side, and this display unit 221 is configured by the display device 101 of the above embodiment.

[0095] (Application example 4) 23 and 24 show the appearance of a digital camera 240 to which the display device 101 of the above embodiment is applied. This digital camera 240 has, for example, a light emitting unit 241 for a flash, a display unit 242, a menu switch 243, and a shutter button 244, and this display unit 242 is configured by the display device 101 of the above embodiment.

[0096] (Application example 5) 25 shows the appearance of a notebook personal computer 250 to which the display device 101 of the above embodiment is applied. This notebook personal computer 250 has, for example, a main body 251, a keyboard 252 for inputting characters and the like, and a display unit 253 for displaying images, and this display unit 253 is configured by the display device 101 of the above embodiment.

[0097] (Application example 6) 26 shows the appearance of a video camera 260 to which the display device 101 of the above embodiment is applied. This video camera has, for example, a main body 261, a lens 262 for photographing a subject provided on the front side of the main body 261, a start / stop switch 263 for photographing, and a display 264. The display 264 is configured from the display device 101 of the above embodiment.

[0098] (Application Example 7) 27 and 28 show the appearance of a mobile phone 270 to which the display device 101 of the above embodiment is applied. This mobile phone 270 has, for example, an upper housing 271 and a lower housing 272 connected by a connecting portion (hinge portion) 273, and has a display 274, a sub-display 275, a picture light 276, and a camera 277. The display 274 or the sub-display 275 is configured by the display device 101 of the above embodiment.

[0099] (Example of lighting equipment application) 29 and 30 show the appearance of a tabletop lighting device to which the lighting devices 1 to 4 of the above-described embodiments are applied. This lighting device 310 has, for example, a lighting unit 313 attached to a support 312 provided on a base 311, and this lighting unit 313 is configured with any of the lighting devices 1 to 4 of the above-described embodiments. By making the light guide plate 40 curved, the lighting unit 313 can be made into any shape, such as a cylindrical shape as shown in FIG. 29 or a curved shape as shown in FIG. 30.

[0100] 31 shows the appearance of an indoor lighting device to which the lighting devices 1 to 4 according to the above embodiments are applied. This lighting device 320 has a lighting unit 321 configured, for example, by any of the lighting devices 1 to 4 according to the above embodiments. The lighting units 321 are arranged at appropriate intervals and in an appropriate number on a ceiling 322A of a building. Note that the lighting units 321 can be installed not only on the ceiling 322A but also in any other location, such as a wall 322B or a floor (not shown), depending on the application.

[0101] These lighting devices 310 and 320 are illuminated by light from the lighting devices 1 to 4. As described in the above embodiment, the lighting devices 1 to 4 have improved light utilization efficiency, so brightness is improved and power consumption is reduced.

[0102] Although the present disclosure has been described above using embodiments, the present disclosure is not limited to the above embodiments and various modifications are possible. For example, the materials and thicknesses of the layers described in the above embodiments are not limited, and other materials and thicknesses may be used.

[0103] Furthermore, for example, in the above embodiment, the light source 10 is an LED, but the light source 10 may be configured by a semiconductor laser or the like.

[0104] Furthermore, for example, in the above embodiments, the configurations of the lighting devices 1 to 4 and the display device 101 (television device) have been specifically described, but it is not necessary for all of the components to be included, and other components may also be included.

[0105] The present technology can also be configured as follows. (1) a light source that generates light at a first wavelength; a light emitter that converts light of the first wavelength into light of a second wavelength different from the first wavelength; a wavelength selective filter provided on the light incident side of the light emitter, which transmits light of the first wavelength and reflects light of the second wavelength; A lighting device comprising: (2) The light emitter contains a fluorescent material. The lighting device according to (1) above. (3) The light emitter includes quantum dots The lighting device according to (2) above. (4) The luminescent material includes a sulfide phosphor. The lighting device according to (2) above. (5) a container for accommodating the light emitter; The wavelength selective filter is provided on the outer surface of the light incident side of the container. The lighting device according to any one of (1) to (4) above. (6) the container has a storage portion for the light emitter therein, The width of the wavelength selective filter is greater than the width of the housing portion. The lighting device according to (5) above. (7) the container has a rectangular parallelepiped shape and is disposed with one surface of the rectangular parallelepiped facing the light source; The wavelength selective filter is provided on at least the surface of the container facing the light source. The lighting device according to (6) above. (8) The surface of the container facing the light source is curved convexly toward the light source. The lighting device according to (7) above. (9) The wavelength-selective filter extends beyond the surface of the container facing the light source to at least a portion of the surface adjacent to the facing surface. The lighting device according to (7) or (8). (10) The light source is a blue light source. The lighting device according to any one of (1) to (9) above. (11) The light emitter converts blue light into red or green light. The lighting device according to (10) above. (12) an optical component having a light incident surface facing the light emitter; The lighting device according to any one of (1) to (11) above. (13) the optical component is a light guide plate, The light incident surface is an end surface of the light guide plate. The lighting device according to (12) above. (14) a liquid crystal panel and an illumination device on the back side of the liquid crystal panel, The lighting device includes: a light source that generates light at a first wavelength; a light emitter that converts light of the first wavelength into light of a second wavelength different from the first wavelength; a wavelength selective filter provided on the light incident side of the light emitter, which transmits light of the first wavelength and reflects light of the second wavelength; A display device comprising:

[0106] This application claims priority based on Japanese Patent Application No. 2012-247262, filed on November 9, 2012, in the Japan Patent Office, the entire contents of which are incorporated herein by reference.

[0107] Those skilled in the art will recognize that various modifications, combinations, subcombinations, and variations may occur depending on design requirements and other factors, and are intended to be within the scope of the appended claims and their equivalents.

Claims

1. A front housing; A rear housing; a display panel held by a middle chassis between the front and rear housings; at least one light source provided on a light source substrate located between the front housing and the rear housing, the light source emitting light in a first wavelength range; a light emitter including particulate quantum dots having a major axis of 1 nm or more and 100 nm or less, embedded in a cured resin so as to be able to receive the light, the light emitter being disposed in the light emitter disposition region; an optical member held by the middle chassis, the optical member including a light incident surface facing the light emitter and a flat light exit surface facing the display panel; a reflecting member provided between the display panel and the rear housing; a fixing member surrounding the light source and having a heat dissipation member attached thereto; a wavelength selection filter disposed outside the cured resin and configured to transmit light in the first wavelength range and reflect light in the second wavelength range and light in a third wavelength range; a container for accommodating the light emitter; Equipped with the light emitter converts at least a portion of the light in the first wavelength range into light in the second wavelength range; the light in the first wavelength range that does not collide with the quantum dots is not converted into light in the second wavelength range and passes through the light emitter arrangement region to be incident on the light incident surface, The container accommodates the quantum dots embedded in the cured resin inside the container. a housing portion; The width of the wavelength-selective filter is wider than the width of the housing portion, The surface of the container facing the light source is curved convexly toward the light source. Display device.

2. A front housing; A rear housing; a display panel held by a middle chassis between the front and rear housings; at least one light source provided on a light source substrate located between the front housing and the rear housing, the light source emitting light in a first wavelength range; a light emitter including particulate quantum dots having a major axis of 1 nm or more and 100 nm or less, embedded in a cured resin so as to be able to receive the light, the light emitter being disposed in the light emitter disposition region; an optical member held by the middle chassis, the optical member including a light incident surface facing the light emitter and a flat light exit surface facing the display panel; a reflecting member provided between the display panel and the rear housing; a fixing member surrounding the light source and having a heat dissipation member attached thereto; a wavelength selection filter disposed outside the cured resin and configured to transmit light in the first wavelength range and reflect light in the second wavelength range and light in a third wavelength range; a container for accommodating the light emitter; Equipped with the light emitter converts at least a portion of the light in the first wavelength range into light in the second wavelength range; the light in the first wavelength range that does not collide with the quantum dots is not converted into light in the second wavelength range and passes through the light emitter arrangement region to be incident on the light incident surface, the container includes a container portion that contains the quantum dots embedded in the cured resin inside the container, The width of the wavelength-selective filter is wider than the width of the housing portion, The wavelength-selective filter extends beyond the surface of the container facing the light source to at least a portion of the surface adjacent to the facing surface. Display device.

3. The light source emits blue light.

3. The display device according to claim 1.

4. The light emitter converts the blue light into green light and red light. The display device according to claim 3.

5. the container has a rectangular parallelepiped shape and is disposed with one surface of the rectangular parallelepiped facing the light source; The wavelength-selective filter is provided on at least a surface of the container facing the light source.

3. The display device according to claim 1.

6. Further comprising a plurality of the light source substrates.

3. The display device according to claim 1.

7. A plurality of the light sources are attached to each of the plurality of the light source substrates. The display device according to claim 6.

8. The light in the first wavelength range that does not collide with the quantum dot passes through the light emitter without being converted into light in the second wavelength range and is incident on the light incident surface. The display device according to claim 7.

9. 2. The display device according to claim 1, wherein the wavelength-selective filter is provided between an optical member and the light emitter and on one side of the light emitter.

Images