Light emitting device

Abstract

To provide a display device including a light emitting device which can enhance the uniformity of color in a plane.SOLUTION: A display device comprises a display panel and a light emitting device located on a back side of the display panel. The light emitting device comprises: a light source that emits blue light; an optical component lying opposite the light source and having a light incident surface extending in a right-and-left direction; a wavelength conversion member provided between the light source and the light incident surface, and wavelength-converting at least a part of the blue light from the light source to red light or green light; and a container extending in the right-and-left direction and accommodating the wavelength conversion member from the light source, the optimum component and the wavelength conversion member. The wavelength conversion member includes a fluorescent substance, traverses a region surrounded by an optical path of light incident on an upper end and a lower end of the light incident surface of the light source and by the light incident surface, and extends to an outside region beyond the region. The light emitting device is of top-down type.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a light-emitting device suitable for a surface light source and a lighting device. [Background technology]

[0002] Surface-emitting devices using blue LEDs (Light Emitting Diodes) are used in backlights or lighting devices for liquid crystal display devices. For example, Patent Document 1 describes a method in which a film coated with a fluorescent material is provided on the light-emitting observation surface of a light guide plate, and light incident on the light guide plate from the blue LED is wavelength-converted by the fluorescent material to obtain white light. Furthermore, Patent Document 2 describes a method in which a wavelength converter made of an elastic body mixed with a fluorescent material is provided between the blue LED and the end face of the light guide plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3116727 specification [Patent Document 2] Patent No. 3114805 specification Summary of the Invention [Problem to be solved by the invention]

[0004] In a light emitting device used as a surface light source, it is generally highly desirable to improve the uniformity of color within the surface.

[0005] The present disclosure has been made in consideration of such problems, and has as its object to provide a light-emitting device that can improve the in-plane color uniformity, and an illumination device including the same. [Means for solving the problem]

[0006] The first display device of the present disclosure comprises a display panel and a light-emitting device on the back side of the display panel, the light-emitting device comprising a light source that emits blue light, an optical component facing the light source and having a light incident surface extending in the left-right direction, a wavelength conversion member disposed between the light source and the light incident surface and converting the wavelength of at least a portion of the blue light from the light source into red light or green light, and a container extending in the left-right direction that contains the wavelength conversion member, of the light source, optical component and wavelength conversion member, the wavelength conversion member traversing the area surrounded by the light path of light incident from the light source to the upper and lower ends of the light incident surface and the light incident surface, and extending to an area outside this area, the light-emitting device being a direct-type. A second display device of the present disclosure includes a liquid crystal panel and a light-emitting device on the back side of the liquid crystal panel, the light-emitting device including a light source, a light guide plate having a first light incident surface facing the light source and extending in the left-right direction, facing the liquid crystal panel and having an uneven surface perpendicular to the first light incident surface, quantum dots provided between the light source and the first light incident surface, and a container extending in the left-right direction and containing the quantum dots among the light source, the light guide plate and the quantum dots, the quantum dots crossing an area surrounded by the optical path of light incident from the light source to the upper and lower ends of the first light incident surface and the first light incident surface, and extending to an outer area beyond this area, and the light-emitting device is a direct-type. A third display device of the present disclosure includes a display panel and a light-emitting device on the back side of the display panel, the light-emitting device including a light source that emits blue light, an optical component facing the light source and having a light incident surface extending in the left-right direction, a wavelength conversion member disposed between the light source and the light incident surface and converting the wavelength of at least a portion of the blue light from the light source into red light or green light, and a container extending in the left-right direction that contains the wavelength conversion member, the light source, the optical component and the wavelength conversion member, the wavelength conversion member traversing an area surrounded by the light path of light incident from the light source to the upper and lower ends of the light incident surface and the light incident surface, and extending beyond this area to an outer area, and the wavelength conversion member includes quantum dots. A fourth display device of the present disclosure includes a display panel and a light-emitting device on the back side of the display panel, the light-emitting device including a light source that emits blue light, an optical component facing the light source and having a light incident surface extending in the left-right direction, and a wavelength conversion member disposed between the light source and the light incident surface and converting the wavelength of at least a portion of the blue light from the light source into red light or green light, the wavelength conversion member being a sheet-like member in which quantum dots are dispersed in a resin, and the wavelength conversion member crosses the area surrounded by the optical path of light incident from the light source to the upper and lower ends of the light incident surface and the light incident surface, and extends beyond this area to an outer area, and the light-emitting device is a direct-type. A fifth display device of the present disclosure includes a liquid crystal panel and a light-emitting device on the back side of the liquid crystal panel, the light-emitting device including a light source including an LED (Light Emitting Diode), a light guide plate having a first light incident surface facing the light source and extending in the left-right direction, facing the liquid crystal panel and having an uneven surface perpendicular to the first light incident surface, quantum dots provided between the light source and the first light incident surface, and a container extending in the left-right direction and containing the quantum dots among the light source, the light guide plate and the quantum dots, the quantum dots traversing an area surrounded by the optical path of light incident from the light source to the upper and lower ends of the first light incident surface and the first light incident surface, and extending to an outer area beyond this area, and the light-emitting device is a direct-type. A sixth display device of the present disclosure includes a display panel and a light-emitting device on the back side of the display panel, the light-emitting device including a light source that emits blue light, an optical component facing the light source and having a light incident surface extending in the left-right direction, and a wavelength conversion member disposed between the light source and the light incident surface and converting the wavelength of at least a portion of the blue light from the light source into red light or green light, the wavelength conversion member being a sheet-like member in which quantum dots are dispersed in a resin, and the wavelength conversion member crosses the area surrounded by the light path of light incident from the light source to the upper and lower ends of the light incident surface and the light incident surface, and extends beyond this area to an outer area, and the wavelength conversion member includes quantum dots.

[0007] In the first to sixth display devices of the present disclosure, images are displayed by selectively transmitting light from a light-emitting device through a liquid crystal panel. In these light-emitting devices, light emitted from a light source is wavelength-converted by a wavelength conversion member, travels inside the optical member, and is emitted from the light-exiting surface, where it is observed as light emission. In the first to sixth display devices of the present disclosure, the wavelength conversion member crosses the area surrounded by the light-incident surface and the optical path of light incident from the light source to the edge of the light-incident surface, and extends beyond this area to an outer area. Therefore, the amount of light from the light source that does not pass through the wavelength conversion member, i.e., the light that is not wavelength-converted by the wavelength conversion member, is reduced. [Effects of the Invention]

[0008] According to the first to sixth display devices of the present disclosure, the wavelength conversion member crosses the area surrounded by the light path of light incident from the light source to the edge of the light incident surface and the light incident surface, and extends beyond this area to the outside, thereby improving the uniformity of color within the surface. Therefore, by configuring a display device or lighting device using this light-emitting device, it is possible to obtain high-quality display or lighting. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view illustrating an overall configuration of a light emitting device according to a first embodiment of the present disclosure. [Figure 2] 2 is a cross-sectional view illustrating the positional relationship between a light source, a light guide plate, and a wavelength conversion member shown in FIG. [Figure 3] 3 is a perspective view showing a bundle of rays traveling from the light source shown in FIG. 2 toward the light incident surface of the light guide plate. [Figure 4] FIG. 4 is a cross-sectional view illustrating a configuration of a light-emitting device according to a second embodiment of the present disclosure. [Figure 5] FIG. 10 is a cross-sectional view illustrating a case where no light blocking member is provided. [Figure 6] FIG. 6 is a plan view schematically illustrating the light emitting state of the light emitting device shown in FIG. 5. [Figure 7] FIG. 6 is a cross-sectional view showing an example of dimensions of the light emitting device shown in FIG. [Figure 8]8 is a cross-sectional view showing a position from which blue light is emitted in a light-emitting device having the dimensions shown in FIG. 7. [Figure 9] FIG. 5 is a cross-sectional view illustrating a modified example of the light emitting device shown in FIG. [Figure 10] 5 is a cross-sectional view illustrating another modified example of the light emitting device shown in FIG. [Figure 11] 5 is a cross-sectional view illustrating yet another modified example of the light emitting device shown in FIG. [Figure 12] 5 is a cross-sectional view illustrating yet another modified example of the light emitting device shown in FIG. [Figure 13] FIG. 10 is a perspective view illustrating an appearance of a display device according to a third embodiment of the present disclosure. [Figure 14] FIG. 14 is an exploded perspective view of the main body shown in FIG. 13. [Figure 15] FIG. 15 is an exploded perspective view of the panel module shown in FIG. [Figure 16] FIG. 1 is a perspective view illustrating an appearance of a first application example of a display device. [Figure 17] FIG. 10 is a perspective view illustrating the appearance of Application Example 2. [Figure 18] 10A is a perspective view showing the appearance of Application Example 3 as seen from the front side, and FIG. 10B is a perspective view showing the appearance as seen from the back side. [Figure 19] FIG. 10 is a perspective view illustrating the appearance of Application Example 4. [Figure 20] FIG. 10 is a perspective view illustrating the appearance of Application Example 5. [Figure 21] (A) is a front view of Application Example 6 in an open state, (B) is a side view thereof, (C) is a front view of the closed state, (D) is a left side view, (E) is a right side view, (F) is a top view, and (G) is a bottom view. [Figure 22] FIG. 11 is a perspective view illustrating the appearance of an application example 7 of the lighting device. [Figure 23] FIG. 10 is a perspective view illustrating the appearance of an application example 8 of the lighting device. [Figure 24] FIG. 10 is a perspective view illustrating the appearance of an application example 9 of the lighting device. DETAILED DESCRIPTION OF THE INVENTION

[0010] 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 (light emitting device; an example in which a wavelength conversion member crosses an area surrounded by the light path of light incident from a light source to an end of the light incident surface and the light incident surface, and extends to an outer area beyond this area) 2. Second embodiment (light emitting device; an example in which a light blocking member is provided on the optical path of light that passes from the light source through the container without passing through the wavelength conversion member and heads toward the surface that is in contact with the light incident surface of the light guide plate) 3. Third embodiment (display device; liquid crystal display device) 4. Display Device Application Examples 1-6 5. Lighting device application examples 7-9

[0011] (First embodiment) 1 shows the overall configuration of a light-emitting device according to a first embodiment of the present disclosure. This light-emitting device 1 is used, for example, as a backlight that illuminates a transmissive liquid crystal panel from behind, or as a lighting device indoors, and includes a light source 10, a light guide plate 20, a wavelength conversion member 30, a reflective member 40, and an optical sheet 50. The light guide plate 20 corresponds to a specific example of an "optical component" in the present disclosure.

[0012] In this specification, the stacking direction of the optical sheet 50, the light guide plate 20, and the reflecting member 40 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 20 is referred to as the X direction, and the up-down direction is referred to as the Y direction.

[0013] The light source 10 is a point light source, and specifically, is composed of an LED (Light Emitting Diode). The light source 10 is, for example, sealed in a package 11 (not shown in FIG. 1, see FIG. 2), and is mounted on a light source substrate 12, and is arranged opposite a light incident surface 20A of the light guide plate 20 (for example, the left and right end surfaces in FIG. 1). The light source substrate 12 has, for example, an elongated rectangular parallelepiped shape, and the light sources 10 are arranged in a row in the longitudinal direction of the light source substrate 12.

[0014] The light guide plate 20 guides light from the light source 10 from a light incident surface 20A to a light exit surface 20B, 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 20 has a rectangular parallelepiped shape consisting of a pair of main surfaces (front and back surfaces) facing each other in the front-rear direction (Z direction) and four end surfaces (side surfaces) in contact with the main surfaces (front and back surfaces).

[0015] As described above, the left and right end faces of the light guide plate 20 serve as light incident surfaces 20A onto which light from the light source 10 is incident. Note that the light incident surface 20A may be only one of the left and right end faces of the light guide plate 20. Alternatively, the light incident surface 20A may be on three end faces of the light guide plate 20 or all four end faces.

[0016] The front and back surfaces of the light guide plate 20 are light exit surfaces 20B and 20D that emit light that has entered through the light incident surface 20A. The light exit surface 20B (front surface) and the light exit surface 20D (back surface) of the light guide plate 20 have a planar shape that corresponds to, for example, an illuminated object (for example, a liquid crystal panel 122 described below) that is arranged on the light exit surface 20B side of the light guide plate 20.

[0017] The light exit surface 20B (surface) of the light guide plate 20 is provided with an uneven pattern made up of, for example, minute protrusions 20C in order to improve the linearity of light propagating within the light guide plate 20. The protrusions 20C are, for example, strip-shaped protrusions or ridges extending in one direction (for example, the left-right direction) of the light exit surface 20B. On the light exit surface 20D (rear surface) of the light guide plate 20, for example, a scattering agent is printed in a pattern as a scattering portion that scatters and homogenizes the light propagating within the light guide plate 20. The scattering portion may be provided with a portion containing a filler instead of a scattering agent, or the surface may be partially roughened.

[0018] The wavelength conversion member 30 converts the wavelength of light from the light source 10, and is provided between the light source 10 and the light incident surface 20A of the light guide plate 20. The wavelength conversion member 30 preferably contains, for example, a fluorescent material. Specifically, the light source 10 is a blue light source, and the wavelength conversion member 30 preferably contains a fluorescent material that converts the wavelength of the blue light from the light source 10 into red light or green light. This makes it possible for the light emitting device 1 to generate light of various colors by combining the red light and green light whose wavelengths have been converted by the wavelength conversion member 30.

[0019] Furthermore, the wavelength conversion member 30 preferably includes, for example, quantum dots. That is, the light source 10 is a blue light source, and the wavelength conversion member 30 preferably includes quantum dots that convert the blue light from the light source 10 into red or green light. Quantum dots have discrete energy levels, and the emission wavelength can be freely selected by changing the dot size. The spectra of the resulting red and green light have narrow half-widths and steep peaks. This increases the color purity of the red and green light and widens the color gamut of the combined light. This makes it possible to expand the color gamut compared to conventional light-emitting devices using white LEDs and fluorescent materials.

[0020] The reflecting member 40 is a plate- or sheet-like member provided on the light exit surface 20D (rear surface) side of the light guide plate 20, and reflects, toward the light guide plate 20, light that leaks out from the light source 10 toward the light exit surface 20D side of the light guide plate 20, or light that has been emitted from inside the light guide plate 20 toward the light exit surface 20D side. The reflecting member 40 has functions such as reflection, diffusion, and scattering, which enable efficient use of light from the light source 10 and increased front brightness.

[0021] The reflective member 40 is made of, for example, foamed PET (polyethylene terephthalate), silver vapor deposition film, multilayer reflective film, or white PET. To provide specular reflection (mirror reflection), the surface of the reflective member 40 is preferably treated with silver vapor deposition, aluminum vapor deposition, or multilayer reflective film. To impart a fine shape to the reflective member 40, the reflective member 40 may be integrally formed by a method such as heat press molding or melt extrusion molding using a thermoplastic resin. Alternatively, the reflective member 40 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.

[0022] The optical sheet 50 is provided on the light exit surface 20B (front surface) side of the light guide plate 20, and includes, for example, a diffusion plate, a diffusion sheet, a lens film, a polarization separation sheet, etc. Fig. 1 shows only one of the multiple optical sheets 50. By providing such an optical sheet 50, it becomes possible to direct light emitted obliquely from the light guide plate 20 toward the front, thereby further increasing the front brightness.

[0023] 2 shows the relative positions of the light source 10, light guide plate 20, and wavelength conversion member 30 shown in FIG. 1, and illustrates a cross section passing through the light emission center 10A of the light source 10 and perpendicular to the light incident surface 20A. As described above, the light source 10 is disposed opposite the light incident surface 20A of the light guide plate 20, and the wavelength conversion member 30 is disposed between the light source 10 and the light incident surface 20A. A reflective member 40 is placed on the light exit surface 20D (rear surface) side of the light guide plate 20.

[0024] The wavelength conversion member 30 is preferably contained and sealed in a tubular container (capillary) 31 made of glass or the like. This is because it is possible to suppress changes in the properties of the wavelength conversion member 30 caused by moisture and oxygen in the atmosphere and to make it easier to handle. Such a wavelength conversion member 30 can be manufactured, for example, by kneading a fluorescent substance or quantum dots into an ultraviolet-curable resin, placing the resulting mixture in a container 31 such as a glass tube, sealing one side of the container 31, irradiating it with ultraviolet light to cure the resin, and forming a gel-like wavelength conversion member 30 with a certain degree of viscosity.

[0025] The wavelength conversion member 30 crosses the region S1 surrounded by the light paths of the light v1 and v2 incident from the light source 10 onto the ends (upper end 20E and lower end 20F) of the light incident surface 20A and the light incident surface 20A, and extends beyond this region S1 to an outer region S2. This enables the light emitting device 1 to improve the uniformity of color within the surface.

[0026] 2 are held by, for example, a fixing member (holder) 60. The fixing member 60 is made of a highly reflective polycarbonate resin, a polyamide resin (for example, "GENESTAR (product name)" manufactured by Kuraray Co., Ltd.), or the like, and has, for example, a first fixing portion 61 that holds the light source 10, and a second fixing portion 62 and a third fixing portion 63 that hold the wavelength converting member 30.

[0027] The first fixing portion 61 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 20A. An opening 61C penetrating from the outer surface 61A to the inner surface 61B is provided in the center of the first fixing portion 61. A seat 61D is provided on the outer surface 61A side of the opening 61C by recessing the periphery of the opening 61C in a stepped manner. Therefore, by fixing the light source substrate 12 to the seat 61D, the package 11 on which the light source 10 is mounted fits gently into the opening 61C. Note that the seat 61D does not necessarily have to be provided depending on the dimensions of the light source substrate 12. Furthermore, it is desirable that part or all of the inner surface 61B be an inclined surface to increase the utilization efficiency of light from the light source 10.

[0028] The second fixing portion 62 and the third fixing portion 63 sandwich the upper and lower ends of the container 31 of the wavelength conversion member 30 and fix the container 31 so that its position and orientation do not shift. The second fixing portion 62 and the third fixing portion 63 extend, for example, from the upper and lower ends of the first fixing portion 61 in a direction substantially perpendicular to the first fixing portion 61. Therefore, the cross-sectional shape of the first fixing portion 61 to the third fixing portion 63 has, for example, three sides of a rectangle. The upper and lower ends of the container 31 are fixed to the second fixing portion 62 and the third fixing portion 63 by being engaged with fixing protrusions (not shown) provided on the second fixing portion 62 and the third fixing portion 63, for example. The upper and lower ends of the container 31 may also be fixed by other methods, such as double-sided adhesive tape.

[0029] Furthermore, the end of the light guide plate 20 and the end of the reflecting member 40 are sandwiched and held between the tip of the second fixing portion 62 and the tip of the third fixing portion 63. It is sufficient that the second fixing portion 62 and the third fixing portion 63 sandwich at least the upper and lower ends of the container 31, and the end of the light guide plate 20 and the end of the reflecting member 40 can also be held by other members (described later).

[0030] A heat dissipation member (heat spreader) (not shown) is attached to the outside of the fixing member 60, particularly around the light source 10. Furthermore, the entire light emitting device 1 including the light source 10, fixing member 60, and heat dissipation member (not shown) is housed in a housing (not shown in FIGS. 1 and 2; see, for example, rear housing 124 in FIG. 15).

[0031] In this light emitting device 1, the light emitted from the light source 10 is wavelength converted by the wavelength conversion member 30, enters the light incident surface 20A of the light guide plate 20, travels inside the light guide plate 20, exits from the light exit surface 20B, passes through the optical sheet 50, and is observed as light emission.

[0032] In this case, since the light source 10 is a point light source as described above, the light emitted from the light source 10 spreads in all directions 360° from the light-emitting center 10A. As shown in FIG. 3, the wavelength conversion member 30 and the light incident surface 20A are long in the left-right direction, so the spread of light in the left-right direction does not pose a particular problem. On the other hand, some of the light that spreads in the vertical direction may deviate above the upper end 20E of the light incident surface 20A or below the lower end 20F.

[0033] 2, the wavelength conversion member 30 crosses the region S1 surrounded by the light paths of the light beams v1 and v2 incident from the light source 10 on the ends (upper end 20E and lower end 20F) of the light incident surface 20A and the light incident surface 20A. In other words, the wavelength conversion member 30 intersects (crosses) the region S1 in a direction parallel to the light incident surface 20A. Therefore, the light that passes through the region S1 and enters the light incident surface 20A can be wavelength converted by the wavelength conversion member 30.

[0034] Furthermore, the wavelength conversion member 30 extends beyond the region S1 to an outer region S2. In other words, the wavelength conversion member 30 is provided so as to extend beyond the region S1 and overlap the outer region S2. Therefore, even light that leaves the light source 10, spreads in the vertical direction, and travels outside the region S1 can be captured to some extent by the wavelength conversion member 30 and undergo wavelength conversion. Therefore, in this light emitting device 1, the amount of light from the light source 10 that does not pass through the wavelength conversion member 30, i.e., the light that is not wavelength-converted by the wavelength conversion member 30, is reduced, improving the in-plane color uniformity.

[0035] As described above, in this embodiment, the wavelength conversion member 30 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 20E and lower end 20F) of the light incident surface 20A and the light incident surface 20A, and extends to the 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 wavelength conversion member 30, i.e., the amount of light that is not wavelength-converted by the wavelength conversion member 30, and improve the uniformity of color within the surface.

[0036] (Second embodiment) 4 shows a cross-sectional configuration of a light emitting device 1A according to a second embodiment of the present disclosure. This light emitting device 1A is configured to reduce color unevenness occurring near the light incident surface 20A and further improve color uniformity within the surface by providing a light blocking member 70 between the container 31 of the wavelength conversion member 30 and the light incident surface 20A of the light guide plate 20. Apart from this, this light emitting device 1A has the same configuration, action, and effect as the first embodiment. Therefore, the same reference numerals will be used to denote corresponding components in the following description.

[0037] The light source 10, package 11, light source substrate 12, light guide plate 20, wavelength conversion member 30, container 31, reflective member 40, and optical sheet 50 are configured in the same manner as in the first embodiment.

[0038] The fixing member 60 has a first fixing portion 61 that holds the light source 10, and a second fixing portion 62 and a third fixing portion 63 that hold the wavelength conversion member 30, similarly to the first embodiment.

[0039] An opening 61C penetrating from the outer surface 61A to the inner surface 61B is provided in the center of the first fixing portion 61. In this embodiment, a seat portion 61D is not provided on the outer surface 61A side of the opening 61C, and the light source substrate 12 is fixed to the outer surface 61A, so that the package 11 mounting the light source 10 fits loosely into the opening 61C.

[0040] The second fixing portion 62 holds the upper end of the container 31 of the wavelength conversion member 30 by sandwiching it between itself and the third fixing portion 63. Note that Fig. 4 shows a case in which the optical sheet 50 is disposed on the light emission surface 20B of the light guide plate 20, and the end of this optical sheet 50 is held by a frame-shaped member 80 (see Fig. 15 ) rather than by the second fixing portion 62. The frame-shaped member 80 is a frame-shaped resin part that holds the optical sheet 50, a so-called middle chassis.

[0041] The third fixing portion 63 sandwiches the lower end of the container 31 of the wavelength conversion member 30 between itself and the second fixing portion 62. The tip of the third fixing portion 63 extends to the light exit surface 20D (rear surface) of the light guide plate 20 and the rear side of the reflecting member 40.

[0042] The light-shielding member 70 is provided on the optical path of light v3 that travels from the light source 10 through the container 31 without passing through the wavelength conversion member 30 and toward the surface that contacts the light incident surface 20A of the light guide plate 20, i.e., the light exit surface 20B or the light exit surface 20D.

[0043] 5, if the light-shielding member 70 is not provided, the light v3 may pass through the gap between the fixing member 60 and the frame-shaped member 80, enter the optical sheet 50, and exit directly to the outside. In this case, the light v3 is not wavelength-converted by the wavelength conversion member 30, and is not mixed with wavelength-converted green or red light inside the light guide plate 20, so that the light v3 remains as blue light generated by the light source 10. Therefore, as schematically shown in FIG. 6, when the light-emitting device 1 is viewed from the front side of the optical sheet 50, a bluish color unevenness B caused by the light v3 is observed along the left and right sides where the light source 10 is provided.

[0044] If specific numerical values ​​for the dimensions and positional relationship of the light source 10, light guide plate 20, and wavelength conversion member 30 are given, it is possible to identify the location 31A from which the light v3 that causes color unevenness B leaves the container 31 based on those values. For example, as shown in FIG. 7, the dimension t1 from the top to the bottom of the container 31 is 4 mm, the thickness t2 of the light guide plate 20 is 3.5 mm, and the maximum thickness t3 of the wavelength conversion member 30 is 2.7 mm. The distance L1 between the light emission center 10A of the light source 10 and the container 31 is 0.6 mm, the thickness L2 of the container 31 in the left-right direction is 2 mm, and the distance L3 between the container 31 and the light incident surface 20A is 1.4 mm. The thickness R of the container 31 (the difference between the outer diameter and the inner diameter) is 1 mm, and the refractive index n of the container 31 is 1.51.

[0045] In this case, as shown in Fig. 8, the emission point 31A of the light v3 that causes the color unevenness B is limited to a range in which the horizontal distance L from the light emission center 10A of the light source 10 is 1.95 mm to 2.16 mm and the height distance t is 1.83 mm to 1.94 mm. Therefore, by providing the light blocking member 70 based on such calculation results, it is possible to block the light v3 and suppress the color unevenness B. Note that in Fig. 8, the emission point 31A of the light v3 that causes the color unevenness B is represented by a line thicker than the outline of the container 31.

[0046] Specifically, the light blocking member 70 is preferably a light blocking protrusion 71 provided on the second fixing portion 62 and the third fixing portion 63 of the fixing member 60, as shown in Fig. 4. This makes it possible to block the light v3 at a position very close to the point where the light v3 that causes the color unevenness B is emitted, thereby reliably suppressing the occurrence of the color unevenness B. Furthermore, the light blocking member 70 can be easily formed in the manufacturing process of the fixing member 60 made of a resin part.

[0047] Furthermore, it is also preferable that the light blocking member 70 is a light blocking protrusion 72 provided on a frame-shaped member 80, as shown in light emitting device 1B in Fig. 9. In this case, the light blocking member 70 can be easily formed in the manufacturing process of the frame-shaped member 80 made of a resin part.

[0048] Furthermore, as shown in the light-emitting device 1C of FIG. 10, the light-shielding member 70 is preferably a light-shielding cushion 73 that covers the surface in contact with the light-incident surface 20A of the light guide plate 20, specifically, the edge of the light-exit surface 20B. In this case, unlike the light-shielding protrusions 71, 72 shown in FIG. 4 or FIG. 9, it is possible to prevent the light from being blocked by the light-shielding protrusions 71, 72, thereby further improving light utilization efficiency. Furthermore, it is preferable that the light-shielding cushion 73 be sandwiched between the frame member 80 and the light-exit surface 20B of the light guide plate 20. This allows for adjustment of the mechanical clearance between the frame member 80 and the light guide plate 20 or for reducing noise generated when the frame member 80 and the light guide plate 20, which are made of different materials, come into contact with each other. The light-shielding cushion 73 is preferably made of, for example, urethane foam (PORON®, manufactured by Rogers Inoac Corporation).

[0049] In addition, as shown in light emitting device 1D in Fig. 11, it is more preferable to provide optical sheet 50 on the opposite side of frame member 80 from light-shielding cushion 73 (i.e., the upper side, i.e., the front side (light emission observation side) of frame member 80). This is because it allows the width of light-shielding cushion 73 to be wider than that in Fig. 10, making it easier to attach light-shielding cushion 73.

[0050] Furthermore, as shown in the light-emitting device 1E of FIG. 12, it is also preferable to provide a lower cushion 74 on the light-emitting surface 20D (rear surface) side of the light guide plate 20, specifically between the reflecting member 40 and the third fixing portion 63 of the fixing member 60. This blocks light that passes from the light source 10 through the container 31 without passing through the wavelength conversion member 30 toward the surface of the light guide plate 20 that contacts the light-incident surface 20A, i.e., the light-emitting surface 20D, thereby reducing color unevenness caused by this light. In addition to blocking light, the lower cushion 74 also has the same clearance adjustment function and noise prevention function as the light-blocking cushion 73 described above. A preferred material for the lower cushion 74 is, for example, polyethylene foam (Super Opcell (registered trademark) manufactured by Sanwa Kako Co., Ltd.).

[0051] 4 and 9 to 12, it is preferable that the end 41 of the reflecting member 40 protrudes toward the light source 10 side beyond the light guide plate 20. This makes it possible to block light that travels from the light source 10 through the container 31 without passing through the wavelength conversion member 30 toward the surface of the light guide plate 20 that is in contact with the light incident surface 20A, i.e., the light exit surface 20D, of the light, thereby suppressing color unevenness caused by this light. Furthermore, by combining this with the light-blocking protrusion 71 of the third fixing portion 63 shown in FIG. 4 or the lower cushion 74 shown in FIG. 12, it is possible to obtain even greater effects.

[0052] In these light emitting devices 1A to 1E, as in the first embodiment, the light emitted from the light source 10 is wavelength converted by the wavelength conversion member 30, enters the light incident surface 20A of the light guide plate 20, travels inside the light guide plate 20, exits from the light exit surface 20B, passes through the optical sheet 50, and is observed as light emission.

[0053] At this time, light v3 is generated from the light source 10, passing through the container 31 without passing through the wavelength conversion member 30, and heading toward the surface of the light guide plate 20 that is in contact with the light incident surface 20A (light exit surface 20B or light exit surface 20D). This light v3 passes through gaps between the fixing member 60 and the frame-shaped member 80, passes through the optical sheet 50, and exits directly to the outside, which may cause the bluish color unevenness B shown in FIG. 6. In this case, the light blocking member 70 is provided on the optical path of such light v3, and the light blocking member 70 blocks the light v3 that causes color unevenness B, further improving the in-plane color uniformity.

[0054] 4 and 9 to 12, some light v4 passes from the light source 10 through the container 31 without passing through the wavelength conversion member 30, passes through the gaps between the fixing member 60 and the frame-shaped member 80, and is incident on the light incident surface 20A of the light guide plate 20. However, since such light v4 is mixed with the wavelength-converted light inside the light guide plate 20, there is little risk of it causing a serious problem such as color unevenness B caused by light v3. Furthermore, even when light v3 is incident on the light exit surface 20B or light exit surface 20D of the light guide plate 20, it is mixed with the wavelength-converted light inside the light guide plate 20, and the problem of color unevenness B is alleviated.

[0055] As described above, in this embodiment, the light-blocking member 70 is provided on the optical path of light v3 that travels from the light source 10 through the container 31 without passing through the wavelength conversion member 30 to the surface that contacts the light incident surface 20A of the light guide plate 20, i.e., the light exit surface 20B or the light exit surface 20D. This makes it possible to block the light v3 that causes color unevenness and further improve the color uniformity within the surface.

[0056] (Third embodiment) 13 shows the appearance of a display device 101 according to a third embodiment of the present disclosure. This display device 101 is used, for example, as a flat-screen 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 detaching the stand 103 from the main body 102.

[0057] FIG. 14 is an exploded view of the main body 102 shown in FIG. 13. 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.

[0058] Fig. 15 is an exploded view of the panel module 112 shown in Fig. 13. 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 50, a light guide plate 20, a reflecting member 40, a rear housing (back chassis) 124, a balancer board 125, a balancer cover 126, and a timing controller board 127 in this order.

[0059] 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 frame member 80, and the light emitting device 1. The balancer board 125 controls the light emitting device 1 and, as shown in FIG. 15, 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.

[0060] In this display device 101, an image is displayed by selectively transmitting light from the light emitting device 1 through the liquid crystal panel 122. As described in the first embodiment, the display device 101 is provided with the light emitting device 1 having improved in-plane color uniformity, and therefore the display quality of the display device 101 is improved.

[0061] In the above embodiment, the display device 101 is described as being equipped with the light-emitting device 1 according to the first embodiment. However, it goes without saying that the display device 101 may be equipped with any of the light-emitting devices 1A to 1E according to the second embodiment instead of the light-emitting device 1 according to the first embodiment.

[0062] (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.

[0063] (Application example 1) 16(A) and 16(B) show the appearance of an electronic book to which the display device 101 of the above embodiment is applied. This electronic book has, for example, a display unit 210 and a non-display unit 220, and the display unit 210 is configured by the display device 101 of the above embodiment.

[0064] (Application example 2) 17 shows the appearance of a smartphone to which the display device 101 of the above embodiment is applied. This smartphone has, for example, a display unit 230 and a non-display unit 240, and the display unit 230 is configured by the display device 101 of the above embodiment.

[0065] (Application example 3) 18 shows the appearance of a digital camera to which the display device 101 of the above embodiment is applied. This digital camera has, for example, a light emitting unit 410 for a flash, a display unit 420, a menu switch 430, and a shutter button 440, and the display unit 420 is configured by the display device 101 of the above embodiment.

[0066] (Application example 4) 19 shows the appearance of a notebook personal computer to which the display device 101 of the above embodiment is applied. This 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 images, and this display unit 530 is configured by the display device 101 of the above embodiment.

[0067] (Application example 5) 20 shows the appearance of a video camera to which display device 101 of the above embodiment is applied. This video camera has, for example, a main body 610, a lens 620 for photographing a subject provided on the front side of main body 610, a start / stop switch 630 for photographing, and a display 640. Display 640 is configured by display device 101 of the above embodiment.

[0068] (Application example 6) 21 shows the appearance of a mobile phone to which display device 101 of the above embodiment is applied. This mobile phone has, for example, an upper housing 710 and a lower housing 720 connected by a connecting portion (hinge portion) 730, and has a display 740, a sub-display 750, a picture light 760, and a camera 770. Of these, display 740 or sub-display 750 is configured by display device 101 of the above embodiment.

[0069] (Example of lighting equipment application) 22 and 23 show the appearance of a tabletop lighting device to which the light emitting devices 1, 1A to 1E of the above-described embodiments are applied. This lighting device has, for example, a lighting unit 843 attached to a support 842 provided on a base 841, and this lighting unit 843 is configured with any of the light emitting devices 1, 1A to 1E of the above-described first and second embodiments. By making the light guide plate 20 curved, the lighting unit 843 can be formed in any shape, such as a cylindrical shape as shown in FIG. 22 or a curved shape as shown in FIG. 23.

[0070] 24 shows the appearance of an indoor lighting device to which the light-emitting devices 1, 1A to 1E of the above embodiments are applied. This lighting device has, for example, lighting units 844 configured with any of the light-emitting devices 1, 1A to 1E of the above embodiments. The lighting units 844 are arranged at appropriate intervals on a ceiling 850A of a building. Note that the lighting units 844 are not limited to being installed on the ceiling 850A, but can also be installed in any location, such as a wall 850B or a floor (not shown), depending on the application.

[0071] In these lighting devices, illumination is provided by light from the light emitting device 1. Here, as described in the first embodiment, the lighting device 1 has improved in-plane color uniformity, and therefore the lighting quality is improved.

[0072] 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.

[0073] 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.

[0074] Furthermore, for example, in the above embodiments, the configurations of the light-emitting devices 1, 1A to 1E and the display device 101 (television device) have been specifically described, but it is not necessary to include all of the components, and other components may also be included.

[0075] In addition, in the above embodiment, the wavelength conversion member 30 is described as being sealed in the container 31, but the wavelength conversion member 30 may also be a sheet-like member in which a fluorescent substance or quantum dots are dispersed in a resin sheet.

[0076] Furthermore, in the above embodiment, an edge-lit light-emitting device 1 has been described in which light from the light source 10 is incident on the light incident surface 20A at the end face of the light guide plate 20 and is emitted forward from the light exit surface 20B. However, the present disclosure is also applicable to a direct-type light-emitting device in which the light sources 10 are arranged in a plane and a diffuser plate is arranged above them as an optical component.

[0077] The present technology can also be configured as follows. (1) a display panel and a light-emitting device on the rear side of the display panel, The light emitting device comprises: a light source that emits blue light; an optical component having a light incident surface extending in the left-right direction and facing the light source; a wavelength conversion member provided between the light source and the light incident surface, the wavelength conversion member converting at least a portion of the blue light from the light source into red light or green light; a container extending in the left-right direction and accommodating the wavelength conversion member among the light source, the optical component, and the wavelength conversion member; Equipped with the wavelength conversion member crosses a region surrounded by the light path of light incident from the light source onto the upper end and the lower end of the light incident surface and the light incident surface, and extends to an outer region beyond this region, The light emitting device is a direct type. Display device. (2) The display panel is a liquid crystal display panel. The display device according to (1) above. (3) Further, a light blocking member is provided, The light blocking member is provided on an optical path of light that travels from the light source through the container without passing through the wavelength conversion member toward a surface of the optical component that is in contact with the light incident surface. The display device according to (1) or (2). (4) The light-shielding member is a light-shielding cushion that covers the edge of the surface of the optical component that contacts the light-incident surface. The display device according to (3) above. (5) an optical sheet provided on a surface of the optical component that contacts the light incident surface; a frame-shaped member for holding the optical sheet; Equipped with The light-shielding cushion is sandwiched between the frame member and the optical component. The display device according to (4) above. (6) The wavelength conversion member contains a fluorescent material. The display device according to any one of (1) to (5). (7) The wavelength conversion member includes quantum dots. The display device according to any one of (1) to (5). (8) a liquid crystal panel and a light emitting device on the rear side of the liquid crystal panel, The light emitting device comprises: A light source and a light guide plate having a first light incident surface that faces the light source and extends in the left-right direction, and facing the liquid crystal panel and having an uneven surface that is perpendicular to the first light incident surface; quantum dots provided between the light source and the first light incident surface; a container that accommodates the quantum dots among the light source, the light guide plate, and the quantum dots, and that extends in the left-right direction; Equipped with the quantum dots traverse a region surrounded by the first light incident surface and an optical path of light incident from the light source on the upper and lower ends of the first light incident surface, and extend to an outer region beyond this region; The light emitting device is a direct type. Display device. (9) Further, a plurality of the light sources; and at least one light source substrate on which a plurality of the light sources are mounted. The display device according to any one of (1) to (8). (10) a display panel and a light-emitting device on the rear side of the display panel, The light emitting device comprises: a light source that emits blue light; an optical component having a light incident surface extending in the left-right direction and facing the light source; a wavelength conversion member provided between the light source and the light incident surface, the wavelength conversion member converting at least a portion of the blue light from the light source into red light or green light; a container extending in the left-right direction and accommodating the wavelength conversion member among the light source, the optical component, and the wavelength conversion member; Equipped with the wavelength conversion member crosses a region surrounded by the light path of light incident from the light source onto the upper end and the lower end of the light incident surface and the light incident surface, and extends to an outer region beyond this region, The wavelength conversion member includes quantum dots. Display device. (11) Further, a plurality of the light sources; and at least one light source substrate on which a plurality of the light sources are mounted. The display device according to (10) above. (12) a display panel and a light-emitting device on the rear side of the display panel, The light emitting device comprises: a light source that emits blue light; an optical component having a light incident surface extending in the left-right direction and facing the light source; a wavelength conversion member that is provided between the light source and the light incident surface and converts the wavelength of at least a portion of the blue light from the light source into red light or green light; Equipped with the wavelength conversion member is a sheet-like member in which quantum dots are dispersed in a resin, and the wavelength conversion member crosses an area surrounded by the light path of light incident from the light source onto the upper end and the lower end of the light incident surface and the light incident surface, and extends to an outer area beyond this area; The light emitting device is a direct type. Display device. (13) The display panel is a liquid crystal display panel. The display device according to (12) above. (14) Further, a light blocking member is provided, The light-shielding member is a light-shielding cushion that covers the edge of the surface of the optical component that contacts the light-incident surface. The display device according to (13) above. (15) an optical sheet provided on a surface of the optical component that contacts the light incident surface; a frame-shaped member for holding the optical sheet; Equipped with The light-shielding cushion is sandwiched between the frame member and the optical component. The display device according to (14) above. (16) a liquid crystal panel and a light emitting device on the rear side of the liquid crystal panel, The light emitting device comprises: a light source including an LED (Light Emitting Diode); a light guide plate having a first light incident surface that faces the light source and extends in the left-right direction, and facing the liquid crystal panel and having an uneven surface that is perpendicular to the first light incident surface; quantum dots provided between the light source and the first light incident surface; a container that accommodates the quantum dots among the light source, the light guide plate, and the quantum dots, and that extends in the left-right direction; Equipped with the quantum dots traverse a region surrounded by the first light incident surface and an optical path of light incident from the light source on the upper and lower ends of the first light incident surface, and extend to an outer region beyond this region; The light emitting device is a direct type. Display device. (17) Further, a plurality of the light sources; and at least one light source substrate on which a plurality of the light sources are mounted. The display device according to (16) above. (18) a display panel and a light-emitting device on the rear side of the display panel, The light emitting device comprises: a light source that emits blue light; an optical component having a light incident surface extending in the left-right direction and facing the light source; a wavelength conversion member that is provided between the light source and the light incident surface and converts the wavelength of at least a portion of the blue light from the light source into red light or green light; Equipped with the wavelength conversion member is a sheet-like member in which quantum dots are dispersed in a resin, and the wavelength conversion member crosses an area surrounded by the light path of light incident from the light source onto the upper end and the lower end of the light incident surface and the light incident surface, and extends to an outer area beyond this area; The wavelength conversion member includes quantum dots. Display device. (19) Further, a plurality of the light sources; and at least one light source substrate on which a plurality of the light sources are mounted. The display device according to (18) above. [Explanation of symbols]

[0078] 1, 1A to 1E...light emitting device, 10...light source, 10A...light emitting center, 11...package, 12...light source substrate, 20...light guide plate, 20A...light incident surface, 20B, 20D...light exit surface, 20C...convex portion, 20E...upper end, 20F...lower end, 30...wavelength conversion member, 31...container, 40...reflective member, 41...end, 50...optical sheet, 60...fixing member, 61...first fixing portion, 61A...outer surface, 61B...inner surface, 61C...opening, 61D...seat portion, 62...second fixing portion, 63...third fixing portion, 70...light blocking member, 71, 72...light blocking protrusions, 73...light blocking cushion, 74...lower cushion, 80...frame-shaped member, 101...display device

Claims

1. A light source and an optical component including a light incident surface facing the light source; provided between the light source and the light incident surface, a wavelength converting member that crosses a first region defined by the light incident surface and an optical path of light that is emitted from the light source and enters an end of the light incident surface perpendicular to an optical axis of the light source, and that extends to a second region outside the first region; a reflecting member disposed outside the optical component with respect to the plane and extending along an axis parallel to the optical axis beyond the light incident surface toward the plane on which the light source is disposed; Equipped with Light-emitting device.

2. The first region is a region surrounded by the light incident surface and the optical path of light emitted from the light source and incident on an end of the light incident surface. The light emitting device according to claim 1 .

3. The wavelength conversion member may further include a container for accommodating the wavelength conversion member. The light emitting device according to claim 2 .

4. The optical component extends along an axis parallel to the optical axis. The light emitting device according to claim 2 .

5. The optical component is adjacent to the reflecting member. The light emitting device according to claim 4 .

6. The reflective member extends the length of the optical component along the optical axis. The light emitting device according to claim 1 .

7. The light source includes at least one light emitting diode mounted on at least one light source substrate. The light emitting device according to claim 6 .

8. The at least one light source substrate has an elongated rectangular parallelepiped shape. The light emitting device according to claim 7 .

9. a light-shielding member provided on an optical path of light emitted from at least one of the plurality of light-emitting diodes, passing through the container without passing through the wavelength conversion member, and proceeding toward a surface of the optical component adjacent to the light incident surface, The light emitting device according to claim 3 .

10. The light blocking member is a part of the optical component on the side opposite to the side on which the reflecting member is located. The light emitting device according to claim 9 .

11. The light-shielding member is a light-shielding cushion that covers the edge of the surface of the optical component that contacts the light-incident surface. The light emitting device according to claim 9 .

12. The optical component further includes an optical sheet provided on a surface that contacts the light incident surface. The light-emitting device according to claim 1 or 2.

13. The optical sheet is provided on the opposite side of the optical component from the reflecting member. The light emitting device according to claim 12.

14. The optical component is a light guide plate. The light-emitting device according to claim 1 or 2.

15. The wavelength conversion member includes quantum dots. The light emitting device according to claim 1 .

16. The light source substrate further includes a fixing member to which the light source substrate is attached, The light source substrate is provided in a recess in the seat portion of the fixing member. The light emitting device according to claim 7.

17. The seat is a part of the fixed member, and a heat dissipation member is attached to the fixed member.

17. The light emitting device according to claim 16.

18. The wavelength conversion member is a sheet-like member in which quantum dots are dispersed in a resin. The light-emitting device according to claim 1 or 2.

19. It is a direct-hit type. The light-emitting device according to claim 1 or 2.

20. The wavelength conversion member converts the light of the first wavelength into red light or green light as the light of the second wavelength. The light-emitting device according to claim 1 or 2.

Images