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 Art

[0002] A surface light-emitting device using a blue LED (Light Emitting Diode) is employed in, for example, the backlight of a liquid crystal display device or a lighting device. For example, Patent Document 1 describes providing a film coated with a fluorescent substance on the light-emitting observation surface of a light guide plate, and wavelength-converting the light incident on the light guide plate from a blue LED with the fluorescent substance to obtain white light. Further, for example, Patent Document 2 describes providing a wavelength converter in which a fluorescent substance is mixed with an elastic body between a blue LED and the end face of a light guide plate.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a light-emitting device used as a surface light source, in general, it is strongly desired to improve the color uniformity in the plane.

[0005] The present disclosure has been made in view of such problems, and an object thereof is to provide a light-emitting device capable of improving the color uniformity in the plane and a lighting device including the same.

Means for Solving the Problems

[0006] The first 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 includes a light source that emits blue light, an optical component that faces the light source and has a light incident surface extending in the left-right direction, a wavelength conversion member that is provided between the light source and the light incident surface and wavelength-converts at least a part of the blue light from the light source into red light or green light, a container that extends in the left-right direction and houses the wavelength conversion member among the light source, the optical component, and the wavelength conversion member. The wavelength conversion member crosses a region surrounded by the optical paths of the light incident from the light source to 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 one. The 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 includes a light source, a light guide plate that faces the light source and has a first light incident surface extending in the left-right direction, and has a concavo-convex surface perpendicular to the first light incident surface and facing the liquid crystal panel, quantum dots provided between the light source and the first light incident surface, a container that extends in the left-right direction and houses the quantum dots among the light source, the light guide plate, and the quantum dots. The quantum dots cross a region surrounded by the optical paths of the light incident from the light source to the upper end and the lower end of the first light incident surface and the first light incident surface, and extend to an outer region beyond this region. The light-emitting device is a direct-type one. The 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 includes a light source that emits blue light, an optical component that faces the light source and has a light incident surface extending in the left-right direction, a wavelength conversion member that is provided between the light source and the light incident surface and wavelength-converts at least a part of the blue light from the light source into red light or green light, a container that extends in the left-right direction and houses the wavelength conversion member among the light source, the optical component, and the wavelength conversion member. The wavelength conversion member crosses a region surrounded by the optical paths of the light incident from the light source to 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 contains quantum dots. The 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 includes a light source that emits blue light, an optical component that faces the light source and has a light incident surface extending in the left-right direction, and a wavelength conversion member that is provided between the light source and the light incident surface and converts at least a part of the blue light from the light source into red light or green light. The wavelength conversion member is a sheet-like member in which quantum dots are dispersed in a resin, and the wavelength conversion member crosses a region surrounded by the optical paths of the light incident from the light source to 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-lit type. The 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 includes a light source including an LED (Light Emitting Diode), a light guide plate that faces the light source and has a first light incident surface extending in the left-right direction, and has an uneven surface perpendicular to the first light incident surface and facing the liquid crystal panel, quantum dots provided between the light source and the first light incident surface, and a container that extends in the left-right direction and houses the quantum dots among the light source, the light guide plate, and the quantum dots. The quantum dots cross a region surrounded by the optical paths of the light incident from the light source to the upper end and the lower end of the first light incident surface and the first light incident surface, and extend to an outer region beyond this region. The light-emitting device is a direct-lit type. The 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 includes a light source that emits blue light, an optical component that faces the light source and has a light incident surface extending in the left-right direction, and a wavelength conversion member that is provided between the light source and the light incident surface and converts at least a part of the blue light from the light source into red light or green light. The wavelength conversion member is a sheet-like member in which quantum dots are dispersed in a resin, and the wavelength conversion member crosses a region surrounded by the optical paths of the light incident from the light source to 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 contains quantum dots.

[0007] In the first to sixth display devices of the present disclosure, image display is performed by selectively transmitting light from a light-emitting device through a liquid crystal panel. In this light-emitting device, the light emitted from a light source is wavelength-converted by a wavelength-converting member, travels inside an optical member, and is emitted from a light-emitting surface and observed as light emission. In the first to sixth display devices of the present disclosure, the wavelength-converting member crosses a region surrounded by an optical path of light incident on an end of a light-incident surface from the light source and the light-incident surface, and extends to an outer region beyond this region. Therefore, the light from the light source that does not pass through the wavelength-converting member, that is, the light that is not wavelength-converted by the wavelength-converting member, is reduced.

Effect of the Invention

[0008] According to the first to sixth display devices of the present disclosure, since the wavelength-converting member crosses a region surrounded by an optical path of light incident on an end of a light-incident surface from the light source and the light-incident surface and extends to an outer region beyond this region, it is possible to enhance the in-plane color uniformity. Therefore, if a display device or a lighting device is configured using this light-emitting device, it is possible to obtain high-quality display or lighting.

Brief Description of the Drawings

[0009]

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Embodiments for Carrying Out 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; Example in which the wavelength conversion member crosses the region surrounded by the optical path of the light incident on the end of the light incident surface from the light source and the light incident surface, and extends to the outer region beyond this region) 2. Second Embodiment (Light Emitting Device; Example in which a light shielding member is provided on the optical path of the light that passes through the container without passing through the wavelength conversion member from the light source and travels toward the surface in contact with the light incident surface of the light guide plate) 3. Third Embodiment (Display Device; Liquid Crystal Display Device) 4. Application Examples 1 to 6 of the Display Device 5. Application Examples 7 to 9 of the Lighting Device

[0011] (First Embodiment) FIG. 1 shows the overall configuration of a light emitting device according to the first embodiment of the present disclosure. This light emitting device 1 is used, for example, as a backlight for illuminating a transmissive liquid crystal panel from behind, or as a lighting device in a room or the like, and includes a light source 10, a light guide plate 20, a wavelength conversion member 30, a reflection member 40, and an optical sheet 50. The light guide plate 20 corresponds to a specific example of the "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 reflection member 40 is the Z direction (front-rear direction), the left-right direction on the main surface (the widest surface) of the light guide plate 20 is the X direction, and the up-down direction is the Y direction.

[0013] The light source 10 is a point 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 mounted on a light source substrate 12, and is disposed opposite to the light incident surface 20A (for example, the left and right end surfaces in FIG. 1) of the light guide plate 20. The light source substrate 12 has, for example, an elongated rectangular parallelepiped shape, and is arranged in a row in the longitudinal direction of the light source substrate 12.

[0014] The light guide plate 20 guides the light from the light source 10 from the light incident surface 20A to the light exit surface 20B, and is mainly composed of, for example, a transparent thermoplastic resin such as polycarbonate resin (PC) or acrylic resin (for example, PMMA (polymethyl methacrylate)). The light guide plate 20 has, for example, a rectangular parallelepiped shape composed of a pair of main surfaces (front surface and back surface) facing each other in the front-rear direction (Z direction) and four end surfaces (side surfaces) on the top, bottom, left, and right that are in contact with these.

[0015] As described above, the left and right end surfaces of the light guide plate 20 serve as the light incident surface 20A on which the 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 surfaces of the light guide plate 20. Also, the light incident surface 20A may be three end surfaces of the light guide plate 20, or all four end surfaces.

[0016] The front surface and the back surface of the light guide plate 20 serve as the light exit surfaces 20B and 20D that emit the light incident from 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, for example, a planar shape corresponding to an irradiated object (for example, a liquid crystal panel 122 described later) disposed on the light exit surface 20B side of the light guide plate 20.

[0017] On the light exit surface 20B (front surface) of the light guide plate 20, in order to improve the straightness of the light propagating in the light guide plate 20, for example, an uneven pattern composed of fine convex portions 20C is provided. The convex portions 20C are, for example, strip-shaped ridges or grooves extending in one direction (for example, the left-right direction) of the light exit surface 20B. On the light exit surface 20D (back surface) of the light guide plate 20, as a scattering portion that scatters and equalizes the light propagating in the light guide plate 20, for example, a scattering agent is printed in a pattern. Note that as the scattering portion, instead of the scattering agent, it is also possible to provide a portion containing a filler or to make the surface partially rough.

[0018] The wavelength conversion member 30 converts the light from the light source 10 in wavelength, 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 substance. Specifically, the light source 10 is a blue light source, and the wavelength conversion member 30 preferably contains a fluorescent substance that converts the blue light from the light source 10 into red light or green light in wavelength. Thereby, in this light emitting device 1, it becomes possible to generate light of various color tones by synthesizing the red light and the green light wavelength-converted by the wavelength conversion member 30.

[0019] Furthermore, the wavelength conversion member 30 preferably contains, for example, quantum dots. That is, the light source 10 is a blue light source, and the wavelength conversion member 30 preferably contains quantum dots that convert the blue light from the light source 10 into red light or green light in wavelength. Quantum dots have discrete energy levels, and the emission wavelength can be freely selected by changing the dot size. The spectra of the obtained red light and green light have a narrow half-value width and a sharp peak. Therefore, the color purity of the red light and the green light is increased, and the color gamut of their combined light is widened. Therefore, it becomes possible to expand the color gamut compared with a light emitting device using a conventional white LED and a fluorescent substance.

[0020] The reflection member 40 is a plate-shaped or sheet-shaped member provided on the light exit surface 20D (back surface) side of the light guide plate 20, and returns the light that has leaked from the light source 10 to the light exit surface 20D side of the light guide plate 20 or the light that has been emitted from the inside of the light guide plate 20 to the light exit surface 20D side, back toward the light guide plate 20. The reflection member 40 has functions such as reflection, diffusion, and scattering, for example, and thereby it becomes possible to efficiently use the light from the light source 10 and increase the front luminance.

[0021] The reflecting member 40 is composed of, for example, foamed PET (polyethylene terephthalate), a silver vapor-deposited film, a multilayer film reflecting film, or white PET. When the reflecting member 40 is provided with a specular reflection (mirror reflection) function, it is preferable that the surface of the reflecting member 40 has been treated by silver vapor deposition, aluminum vapor deposition, or multilayer film reflection. When imparting a fine shape to the reflecting member 40, the reflecting member 40 may be integrally formed by a method such as hot press molding using a thermoplastic resin or melt extrusion molding. Further, for example, after applying an energy ray (for example, ultraviolet ray) curable resin onto a base material made of PET or the like, the shape may be transferred to the energy ray curable resin to form it. Here, examples of the thermoplastic resin include polycarbonate resin, acrylic resins such as PMMA (polymethyl methacrylate resin), polyester resins such as polyethylene terephthalate, amorphous copolymer polyester resins such as MS (copolymer of methyl methacrylate and styrene), polystyrene resin, and polyvinyl chloride resin. Further, when transferring the shape to the energy ray (for example, ultraviolet ray) curable resin, the base material may be glass.

[0022] The optical sheet 50 is provided on the light emitting 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, and the like. In FIG. 1, only one of these plurality of optical sheets 50 is shown. By providing such an optical sheet 50, it becomes possible to raise the light emitted from the light guide plate 20 in an oblique direction to the front direction, and it becomes possible to further increase the front luminance.

[0023] FIG. 2 shows the arrangement relationship of the light source 10, the light guide plate 20, and the wavelength conversion member 30 shown in FIG. 1, and represents a cross section perpendicular to the light incident surface 20A passing through the light emission center 10A of the light source 10. As described above, the light source 10 is disposed opposite to 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 reflecting member 40 is laid on the light emitting surface 20D (rear surface) side of the light guide plate 20.

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

[0025] The wavelength conversion member 30 crosses the region S1 surrounded by the optical paths of the lights ν1 and ν2 incident on the ends (upper end 20E and lower end 20F) of the light incident surface 20A from the light source 10 and the light incident surface 20A, and extends to the outer region S2 beyond this region S1. Thereby, in this light emitting device 1, it is possible to enhance the in-plane color uniformity.

[0026] The light source 10 and the wavelength conversion member 30 shown in FIG. 2 are held, for example, by a fixing member (holder) 60. The fixing member 60 is made of a highly reflective polycarbonate resin, a polyamide-based resin (for example, "Genesta (trade name)" manufactured by Kuraray Co., Ltd.), etc., 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 conversion 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 at the central portion of the first fixing portion 61. A seat portion 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, when the light source substrate 12 is fixed to the seat portion 61D, the package 11 on which the light source 10 is mounted fits gently into the opening 61C. Note that the seat portion 61D does not necessarily need to be provided depending on the dimensions of the light source substrate 12. Also, it is desirable that a part or all of the inner surface 61B be an inclined surface in order to enhance the utilization efficiency of the 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 them so that the position and orientation of the container 31 do not shift. The second fixing portion 62 and the third fixing portion 63 extend, for example, in a direction substantially perpendicular to the first fixing portion 61 from the upper and lower ends of the first fixing portion 61. Therefore, the cross-sectional shape of the first fixing portion 61 to the third fixing portion 63 forms, 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 locked to fixing protrusions (not shown) provided on the second fixing portion 62 and the third fixing portion 63, for example. Note that the upper and lower ends of the container 31 may be fixed by other methods such as double-sided adhesive tape.

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

[0030] Note that a heat dissipation member (heat spreader) (not shown) is attached outside such a fixing member 60, particularly around the light source 10. Furthermore, the entire light emitting device 1 including the light source 10 to the fixing member 60 and the heat dissipation member (not shown) is housed in a housing (not shown in FIGS. 1 and 2, see, for example, the 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, and passes through the optical sheet 50 and is observed as light emission.

[0032] At this time, 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 of 360° from the light emission center 10A. As shown in FIG. 3, since the wavelength conversion member 30 and the light incident surface 20A are long in the left-right direction, the spread of light in the left-right direction does not particularly pose a problem. On the other hand, a part of the light spreading in the up-down direction may escape above the upper end 20E or below the lower end 20F of the light incident surface 20A.

[0033] Here, as shown in FIG. 2, the wavelength conversion member 30 crosses the region S1 surrounded by the optical paths of the lights ν1, ν2 incident from the light source 10 to the ends (the upper end 20E and the lower end 20F) of the light incident surface 20A and the light incident surface 20A. In other words, the wavelength conversion member 30 intersects (cuts across) the light incident surface 20A in a direction parallel to the light incident surface 20A with respect to the region S1. Therefore, for the light incident on the light incident surface 20A passing through the region S1, wavelength conversion by the wavelength conversion member 30 can be received.

[0034] Furthermore, the wavelength conversion member 30 extends to the outer region S2 beyond this region S1. That is, the wavelength conversion member 30 is provided so as to protrude from the region S1 and cover the outer region S2. Therefore, for the light emitted from the light source 10 and spreading in the up-down direction and traveling outside the region S1, it can also be captured by the wavelength conversion member 30 to some extent and receive wavelength conversion. Accordingly, in this light emitting device 1, the light that does not pass through the wavelength conversion member 30 among the light from the light source 10, that is, the light that is not wavelength-converted by the wavelength conversion member 30 is reduced, and the color uniformity in the plane is improved.

[0035] As described above, in this embodiment, the wavelength conversion member 30 crosses the region S1 surrounded by the optical paths of the lights ν1, ν2 incident from the light source 10 to the ends (the upper end 20E and the 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. Therefore, it is possible to reduce the light that does not pass through the wavelength conversion member 30 among the light from the light source 10, that is, the light that is not wavelength-converted by the wavelength conversion member 30, and enhance the color uniformity in the plane.

[0036] (Second Embodiment) FIG. 4 shows a cross-sectional configuration of a light-emitting device 1A according to a second embodiment of the present disclosure. In this light-emitting device 1A, a light-shielding member 70 is provided between a container 31 of a wavelength conversion member 30 and a light incident surface 20A of a light guide plate 20, thereby reducing color unevenness generated in the vicinity of the light incident surface 20A and further enhancing color uniformity in the plane. Except for this, this light-emitting device 1A has the same configuration, operation, and effects as those of the first embodiment. Therefore, corresponding components are denoted by the same reference numerals and will be described.

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

[0038] The fixing member 60 has, in the same manner as in the first embodiment, 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.

[0039] An opening 61C that penetrates from an outer surface 61A to an inner surface 61B is provided at the center of the first fixing portion 61. In the present embodiment, a seat portion 61D on the outer surface 61A side of the opening 61C is not provided, and the light source substrate 12 is fixed to the outer surface 61A, so that the package 11 on which the light source 10 is mounted gently fits into the opening 61C.

[0040] The second fixing portion 62 sandwiches and holds the upper end of the container 31 of the wavelength conversion member 30 between the third fixing portion 63. In FIG. 4, an optical sheet 50 is disposed on the light-emitting surface 20B of the light guide plate 20, and an end portion of this optical sheet 50 is held by a frame-shaped member 80 (see FIG. 15) instead of the second fixing portion 62. The frame-shaped member 80 is a frame-shaped resin component that holds the optical sheet 50, that is, 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 it and the second fixing portion 62. The tip of the third fixing portion 63 extends to the light emitting surface 20D (back surface) of the light guide plate 20 and the back side of the reflection member 40.

[0042] The light shielding member 70 is provided on the surface of the container 31 that passes through the container 31 without passing through the wavelength conversion member 30 from the light source 10 and contacts the light incident surface 20A of the light guide plate 20, that is, on the optical path of the light ν3 directed toward the light emitting surface 20B or the light emitting surface 20D.

[0043] That is, as shown in FIG. 5, when the light shielding member 70 is not provided, there is a possibility that the light ν3 passes through the gap between the fixing member 60 and the frame-like member 80 and enters the optical sheet 50 and exits to the outside as it is. In this case, the light ν3 has not undergone wavelength conversion by the wavelength conversion member 30 and is not mixed with the wavelength-converted green light or red light inside the light guide plate 20, so it remains the blue light generated from the light source 10. Therefore, as schematically shown in FIG. 6, when the light emitting device 1 is viewed from the surface side of the optical sheet 50, a strong blue color unevenness B due to the light ν3 is observed along the left and right sides where the light source 10 is provided.

[0044] The location 31A where the light ν3 that causes such color unevenness B exits from the container 31 can be specified based on the specific numerical values of the dimensions and positional relationships of the light source 10, the light guide plate 20, and the wavelength conversion member 30 if they are given. For example, as shown in FIG. 7, let the dimension t1 from the upper end to the lower end of the container 31 be 4 mm, the thickness t2 of the light guide plate 20 be 3.5 mm, and the maximum thickness t3 of the wavelength conversion member 30 be 2.7 mm. Let the distance L1 between the light emitting center 10A of the light source 10 and the container 31 be 0.6 mm, the thickness L2 of the container 31 in the left-right direction be 2 mm, and the distance L3 between the container 31 and the light incident surface 20A be 1.4 mm. Let the thickness (difference between the outer diameter and the inner diameter) R of the container 31 be 1 mm and the refractive index n of the container 31 be 1.51.

[0045] In this case, as shown in FIG. 8, the emission position 31A of the light ν3 that causes the color unevenness B is limited to a range where 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 direction distance t is 1.83 mm to 1.94 mm. Therefore, by providing the light shielding member 70 based on such calculation results, it is possible to shield the light ν3 and suppress the color unevenness B. In FIG. 8, the emission position 31A of the light ν3 that causes the color unevenness B is represented by a line thicker than the contour line of the container 31.

[0046] Specifically, as shown in FIG. 4, the light shielding member 70 is preferably the light shielding protrusion 71 provided on the second fixing portion 62 and the third fixing portion 63 of the fixing member 60. By doing so, it becomes possible to shield the light ν3 at a position extremely close to the emission position of the light ν3 that causes the color unevenness B, and it becomes possible to reliably suppress the occurrence of the color unevenness B. Further, in the manufacturing process of the fixing member 60 made of a resin component, it becomes possible to easily form the light shielding member 70.

[0047] Also, as shown in the light emitting device 1B of FIG. 9, the light shielding member 70 is preferably the light shielding protrusion 72 provided on the frame-shaped member 80. In this case, in the manufacturing process of the frame-shaped member 80 made of a resin component, it becomes possible to easily form the light shielding member 70.

[0048] Furthermore, as shown in the light-emitting device 1C of FIG. 10, it is also preferable that the light-shielding member 70 is a light-shielding cushion 73 that contacts the light-incident surface 20A of the light guide plate 20, specifically, that covers the end portion of the light-emitting surface 20B. In this case, unlike the light-shielding protrusions 71 and 72 shown in FIG. 4 or FIG. 9, it is possible to suppress the light from being kicked by the light-shielding protrusions 71 and 72, and it is possible to further improve the light utilization efficiency. Further, it is preferable that the light-shielding cushion 73 is sandwiched between the frame-shaped member 80 and the light-emitting surface 20B of the light guide plate 20. Thereby, it is possible to adjust the mechanical clearance between the frame-shaped member 80 and the light guide plate 20, or to reduce the noise generated when the frame-shaped member 80 and the light guide plate 20 made of different materials come into contact with each other. As the constituent material of the light-shielding cushion 73, for example, urethane foam (''PORON (registered trademark)'' manufactured by Rogers Inoaak Co., Ltd.) is preferable.

[0049] In addition, as shown in the light-emitting device 1D of FIG. 11, it is more preferable if the optical sheet 50 is provided on the side opposite to the light-shielding cushion 73 with respect to the frame-shaped member 80 (the upper side, that is, the front side (light-emitting observation surface side) of the frame-shaped member 80). This is because the width of the light-shielding cushion 73 can be made wider than that in FIG. 10, and the attachment of the light-shielding cushion 73 becomes easier.

[0050] Furthermore, as shown in the light-emitting device 1E of FIG. 12, it is also preferable to provide a lower cushion 74 between the light-emitting surface 20D (back surface) side of the light guide plate 20, specifically, between the reflection member 40 and the third fixing portion 63 of the fixing member 60. By doing so, it is possible to shield the light that passes through the container 31 from the light source 10 without passing through the wavelength conversion member 30 and contacts the light-incident surface 20A of the light guide plate 20, that is, the light that travels toward the light-emitting surface 20D, and suppress the color unevenness caused by this light. In addition to light shielding, the lower cushion 74 also has the same clearance adjustment function and abnormal noise prevention function as the above-described light-shielding cushion 73. As the constituent material of the lower cushion 74, for example, polyethylene foam (''Super Ocel (registered trademark)'' manufactured by Sanwa Kako Co., Ltd.) is preferable.

[0051] In addition, as shown in FIGS. 4, 9 to 12, it is preferable that the end portion 41 of the reflecting member 40 protrudes beyond the light source 10 side of the light guide plate 20. Thereby, the surface that passes through the container 31 from the light source 10 without passing through the wavelength conversion member 30 and contacts the light incident surface 20A of the light guide plate 20, that is, the light traveling toward the light emitting surface 20D is blocked, and color unevenness caused by this light can be suppressed. Further, by combining with the light shielding protrusion 71 of the third fixing portion 63 shown in FIG. 4, or by combining with the lower cushion 74 shown in FIG. 12, it is also possible to obtain a higher effect.

[0052] In this light emitting device 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 emitting surface 20B, passes through the optical sheet 50, and is observed as light emission.

[0053] At this time, light ν3 that passes through the container 31 from the light source 10 without passing through the wavelength conversion member 30 and travels toward the surface (light emitting surface 20B or light emitting surface 20D) that contacts the light incident surface 20A of the light guide plate 20 is generated. This light ν3 passes through the gaps between the fixing member 60 and the frame-shaped member 80, etc., passes through the optical sheet 50, and directly exits to the outside, which may cause strong blue color unevenness B as shown in FIG. 6. Here, since the light shielding member 70 is provided on the optical path of such light ν3, the light ν3 that causes the color unevenness B is shielded by this light shielding member 70, and the in-plane color uniformity is further improved.

[0054] In addition, as shown in FIGS. 4, 9 to 12, there is also light ν4 that passes through the container 31 from the light source 10 without passing through the wavelength conversion member 30, passes through the gaps between the fixing member 60 and the frame-shaped member 80, etc., and enters the light incident surface 20A of the light guide plate 20. However, since such light ν4 is mixed with the wavelength-converted light inside the light guide plate 20, the possibility of causing a major problem such as color unevenness B caused by light ν3 is small. Further, even when light ν3 enters the light emitting surface 20B or the light emitting 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] Thus, in the present embodiment, the light shielding member 70 is provided on the surface that passes through the container 31 from the light source 10 without passing through the wavelength conversion member 30 and contacts the light incident surface 20A of the light guide plate 20, that is, on the optical path of the light ν3 that travels toward the light emitting surface 20B or the light emitting surface 20D. Therefore, the light ν3 that causes color unevenness can be shielded, and the color uniformity within the plane can be further improved.

[0056] (Third Embodiment) FIG. 13 shows the appearance of a display device 101 according to the third 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 image display is supported by a stand 103. Note that the display device 101 is used as a stand-alone type by being placed on a horizontal surface such as a floor, a shelf, or a table with the stand 103 attached to the main body 102, but it can also be used as a wall-mounted type with the stand 103 removed from the main body 102.

[0057] FIG. 14 shows 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 back surface thereof, and a mounting bracket 117 is fixed. The mounting bracket 117 is for mounting a wall mounting bracket, mounting a board, etc., and mounting the stand 103. The rear exterior member 113 covers the back surface and side surfaces of the panel module 112.

[0058] FIG. 15 shows the panel module 112 shown in FIG. 13 in an exploded view. 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 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 substrate 125, a balancer cover 126, and a timing controller substrate 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 has, 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. 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 substrate 125 controls the light-emitting device 1, and as shown in FIG. 15, is mounted on the back surface of the rear housing 124 and covered by the balancer cover 126. The timing controller substrate 127 is also mounted on the back surface of the rear housing 124.

[0060] In this display device 101, an image is displayed by the light from the light-emitting device 1 being selectively transmitted by the liquid crystal panel 122. Here, as described in the first embodiment, since the light-emitting device 1 with improved in-plane color uniformity is provided, the display quality of the display device 101 is improved.

[0061] In the above embodiment, the case where the display device 101 includes the light-emitting device 1 according to the first embodiment has been described. Needless to say, the display device 101 may include any one 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] (Application Example of Display Device) Next, application examples of the display device 101 to the electronic devices as described above will be explained. Examples of the electronic devices include television devices, digital cameras, notebook personal computers, portable terminal devices such as mobile phones, or video cameras. In other words, the above display device can be applied to electronic devices in all fields that display an image signal input from the outside or an image signal generated internally as an image or video.

[0063] (Application Example 1) FIGS. 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 this display unit 210 is configured by the display device 101 of the above embodiment.

[0064] (Application Example 2) FIG. 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 this display unit 230 is configured by the display device 101 of the above embodiment.

[0065] (Application Example 3) FIG. 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 flash, a display unit 420, a menu switch 430, and a shutter button 440, and this display unit 420 is configured by the display device 101 of the above embodiment.

[0066] (Application Example 4) FIG. 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 input operations such as characters, and a display unit 530 for displaying an image, and this display unit 530 is configured by the display device 101 of the above embodiment.

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

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

[0069] (Application Example of Lighting Device) FIGS. 22 and 23 show the appearance of a desktop lighting device to which the light-emitting devices 1, 1A to 1E of the above embodiment are applied. This lighting device is, for example, one in which a lighting unit 843 is attached to a support column 842 provided on a base 841, and this lighting unit 843 is constituted by any one of the light-emitting devices 1, 1A to 1E according to the first and second embodiments. The lighting unit 843 can be formed into an arbitrary shape such as a cylindrical shape shown in FIG. 22 or a curved surface shape shown in FIG. 23 by making the light guide plate 20 into a curved shape.

[0070] FIG. 24 shows the appearance of an indoor lighting device to which the light-emitting devices 1, 1A to 1E of the above-described embodiment are applied. This lighting device has, for example, a lighting unit 844 configured by any one of the light-emitting devices 1, 1A to 1E according to the above-described embodiment. The lighting unit 844 is arranged on the ceiling 850A of the building at appropriate numbers and intervals. Note that the lighting unit 844 can be installed not only on the ceiling 850A but also at any location such as a wall 850B or a floor (not shown) according to the application.

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

[0072] As described above, the present disclosure has been described with reference to the embodiments. However, the present disclosure is not limited to the above-described embodiments, and various modifications are possible. For example, the materials and thicknesses of the respective layers described in the above-described embodiments are not limited, and other materials and thicknesses may be used.

[0073] Further, for example, in the above-described embodiment, the case where the light source 10 is an LED has been described. However, the light source 10 may be configured by a semiconductor laser or the like.

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

[0075] In addition, in the above-described embodiment, the case where the wavelength conversion member 30 is enclosed in the container 31 has been described. However, the wavelength conversion member 30 may be a sheet-like member in which a fluorescent substance or quantum dots are dispersed in a resin sheet.

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

[0077] Note that the present technology can also be configured as follows. (1) A display panel and a light-emitting device on the back side of the display panel are provided. The light-emitting device A light source that emits blue light, An optical component that faces the light source and has a light incident surface extending in the left-right direction, A wavelength conversion member provided between the light source and the light incident surface, which wavelength-converts at least a part of the blue light from the light source into red light or green light, A container that extends in the left-right direction and houses the wavelength conversion member among the light source, the optical component, and the wavelength conversion member are provided. The wavelength conversion member crosses a region surrounded by an optical path of light incident on the upper end and the lower end of the light incident surface from the light source and the light incident surface, and extends to an outer region beyond this region. The light-emitting device is of the direct-lit type display device. (2) The display panel is a liquid crystal display panel The display device according to (1) above. (3) Furthermore, a light-shielding member is provided. The light-shielding member is provided on an optical path of light that travels from the light source, passes through the container without passing through the wavelength conversion member, and heads toward a surface that contacts the light incident surface of the optical component. The display device according to (1) or (2) above. (4) The light-shielding member is a light-shielding cushion that covers an end portion of a surface that contacts the light incident surface of the optical component. The display device according to (3) above. (5) Furthermore, an optical sheet provided on a surface of the optical component that contacts the light incident surface, and a frame-shaped member that holds the optical sheet are provided, wherein the light-shielding cushion is sandwiched between the frame-shaped member and the optical component The display device according to (4) above. (6) The wavelength conversion member contains a fluorescent substance The display device according to any one of (1) to (5) above. (7) The wavelength conversion member contains quantum dots The display device according to any one of (1) to (5) above. (8) A liquid crystal panel and a light-emitting device on the back side of the liquid crystal panel are provided, The light-emitting device includes a light source, a light guide plate that faces the light source and has a first light incident surface extending in the left-right direction, and that faces the liquid crystal panel and has a concavo-convex surface perpendicular to the first light incident surface, quantum dots provided between the light source and the first light incident surface, a container that extends in the left-right direction and houses the quantum dots among the light source, the light guide plate, and the quantum dots are provided, The quantum dots cross a region surrounded by the optical paths of light incident on the upper end and the lower end of the first light incident surface from the light source and the first light incident surface, and extend to an outer region beyond this region, The light-emitting device is a direct-lit type display device. (9) Furthermore, a plurality of the light sources, and at least one light source substrate on which the plurality of the light sources are mounted The display device according to any one of (1) to (8) above. (10) A display panel and a light-emitting device on the back side of the display panel are provided, The light-emitting device includes a light source that emits blue light, an optical component that faces the light source and has a light incident surface extending in the left-right direction, a wavelength conversion member that is provided between the light source and the light incident surface and that wavelength-converts at least a part of the blue light from the light source into red light or green light, and a container that extends in the left-right direction and that houses the wavelength conversion member among the light source, the optical component, and the wavelength conversion member and is provided with the wavelength conversion member crosses a region surrounded by an optical path of light incident on upper and lower ends of the light incident surface from the light source and the light incident surface, and extends to an outer region beyond this region, the wavelength conversion member includes quantum dots display device. (11) Furthermore, it includes a plurality of the light sources and at least one light source substrate on which the plurality of the light sources are mounted the display device according to (10) above. (12) It includes a display panel and a light-emitting device on the back side of the display panel, the light-emitting device includes a light source that emits blue light, an optical component that faces the light source and has a light incident surface extending in the left-right direction, and a wavelength conversion member that is provided between the light source and the light incident surface and that wavelength-converts at least a part of the blue light from the light source into red light or green light and is provided with the wavelength conversion member is a sheet-like member in which quantum dots are dispersed in resin, and the wavelength conversion member crosses a region surrounded by an optical path of light incident on upper and lower ends of the light incident surface from the light source and the light incident surface, and extends to an outer region beyond this region, 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) Furthermore, it includes a light-shielding member, wherein the light-shielding member is a light-shielding cushion that covers an end portion of a surface in contact with the light incident surface of the optical component. The display device according to (13). (15) Furthermore, an optical sheet provided on a surface in contact with the light incident surface of the optical component, and a frame-shaped member that holds the optical sheet are provided, wherein the light-shielding cushion is sandwiched between the frame-shaped member and the optical component. The display device according to (14). (16) It includes a liquid crystal panel and a light-emitting device on the back side of the liquid crystal panel, wherein the light-emitting device includes a light source including an LED (Light Emitting Diode), a light guide plate that faces the light source and has a first light incident surface extending in the left-right direction, and that faces the liquid crystal panel and has a concavo-convex surface perpendicular to the first light incident surface, and quantum dots provided between the light source and the first light incident surface, and a container that extends in the left-right direction and houses the quantum dots among the light source, the light guide plate, and the quantum dots. are provided, wherein the quantum dots cross a region surrounded by an optical path of light incident from the light source to the upper end and the lower end of the first light incident surface and the first light incident surface, and extend to an outer region beyond this region. The light-emitting device is a direct-lit type. Display device. (17) Furthermore, it includes a plurality of the light sources, and at least one light source substrate on which the plurality of the light sources are mounted. The display device according to (16). (18) It includes a display panel and a light-emitting device on the back side of the display panel, wherein the light-emitting device 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 provided between the light source and the light incident surface, which wavelength - converts at least a part of the blue light from the light source into red light or green light and comprising, The wavelength conversion member is a sheet - like member in which quantum dots are dispersed in a resin, and the wavelength conversion member crosses a region surrounded by the optical paths of the light incident on the upper end and the lower end of the light incident surface from the light source and the light incident surface, and extends to an outer region beyond this region. The wavelength conversion member contains quantum dots A display device. (19) Furthermore, a display device comprising a plurality of the light sources and at least one light source substrate on which the plurality of the light sources are mounted The display device according to (18) above.

Explanation of reference numerals

[0078] 1, 1A~1E... light - emitting devices, 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 surfaces, 20C... convex portion, 20E... upper end, 20F... lower end, 30... wavelength conversion member, 31... container, 40... reflection member, 41... end portion, 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 - shielding member, 71, 72... light - shielding protrusions, 73... light - shielding cushion, 74... lower cushion, 80... frame - like member, 101... display device.

Claims

1. a light source sealed within a package and mounted on a light source substrate; an optical component including a light incident surface facing the light source; a wavelength conversion member provided between the light source and the light incident surface, which converts at least part of the wavelength of light from the light source from a first wavelength to a second wavelength different from the first wavelength; a container for enclosing the wavelength conversion member; a light shielding member provided on the optical path of light that passes through the container without passing through the wavelength conversion member from the light source and travels toward the surface that contacts the light incident surface of the optical component; comprising; the wavelength conversion member converts light of the first wavelength into red light or green light as light of the second wavelength; a light emitting device.

2. the wavelength conversion member crosses a first region surrounded by the light incident surface and the optical path of light emitted from the light source and incident on an end portion of the light incident surface, and extends to a second region outside the first region; the light emitting device according to Claim 1.

3. comprising the light emitting device according to Claim 1 or Claim 2 as an illuminating portion having a curved surface; an illuminating device.

4. the light shielding member is a light shielding cushion that covers an end portion of the surface of the optical component that contacts the light incident surface; the light emitting device according to Claim 1.

5. an optical sheet provided on the surface of the optical component that contacts the light incident surface; a frame-shaped member for holding the optical sheet; further comprising; the light shielding cushion is sandwiched between the frame-shaped member and the optical component; the light emitting device according to Claim 4.

6. the optical component is a light guide plate; the light emitting device according to Claim 1 or Claim 2.

7. the optical component is a light guide plate having a curved shape; the light emitting device according to Claim 1 or Claim 2.

8. the wavelength conversion member contains quantum dots; the light emitting device according to Claim 1 or Claim 2.

9. further comprising a fixing member to which the light source substrate is attached; the light source substrate is provided in a recess of a seat portion of the fixing member; the light emitting device according to Claim 1 or Claim 2.

10. the seat portion is a part of the fixing member, and a heat dissipation member is attached to the fixing member; the light emitting device according to Claim 9.

11. the wavelength conversion member is a sheet-shaped member in which quantum dots are dispersed in a resin; the light emitting device according to Claim 1 or Claim 2.

12. a reflection member provided on the light emitting surface of the optical component; A frame-shaped member that holds the wavelength conversion member and extends so as to cover the light-emitting surface of the optical component, A light-shielding member sandwiched between the frame-shaped member and the light-emitting surface further comprising The light-emitting device according to claim 1 or claim 2.

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

14. It is an edge light type The light-emitting device according to claim 1 or claim 2.

15. further comprising at least one holding member that holds the container by sandwiching the upper end and the lower end of the container The light-emitting device according to claim 1.

16. A light source sealed in a package and mounted on a light source substrate, An optical component including a light incident surface facing the light source, A wavelength conversion member provided between the light source and the light incident surface, which converts the wavelength of at least a part of the light from the light source from a first wavelength to a second wavelength different from the first wavelength, A fixing member to which the light source substrate is attached comprising 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 source substrate is provided in a recess of a seat portion of the fixing member Light-emitting device.

17. The seat portion is a part of the fixing member, and a heat radiating member is attached to the fixing member is The light-emitting device according to claim 16.

Images