JP2024020648A - light emitting device - Google Patents

Abstract

A display device including a light emitting device capable of improving in-plane color uniformity is provided. This display device 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 has a light incident surface facing the light source and extending in the left and right direction, and is provided between the light source and the light incident surface, and is configured to emit at least the blue light from the light source. It includes a wavelength conversion member that converts a portion of the wavelength into red light or green light, and a container that extends in the left-right direction and accommodates the wavelength conversion member among the light source, the optical component, and the wavelength conversion member. The wavelength conversion member includes a fluorescent material, and extends across an 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 to an outside area beyond this area. The light emitting device is a direct type. [Selection diagram] Figure 2

Description

The present disclosure relates to a light emitting device and a lighting device suitable for a surface light source.

2. Description of the Related Art Surface-emitting devices using blue LEDs (Light Emitting Diodes) are used as backlights or lighting devices for liquid crystal display devices. For example, Patent Document 1 describes that a film coated with a fluorescent material is provided on the light emission observation surface of a light guide plate, and that white light is obtained by converting the wavelength of light incident on the light guide plate from a blue LED using the fluorescent material. . Further, for example, Patent Document 2 describes that a wavelength converter made of an elastic material mixed with a fluorescent material is provided between a blue LED and an end surface of a light guide plate.

Patent No. 3116727 specification Patent No. 3114805 specification

In a light emitting device used as a surface light source, it is generally strongly desired to have high in-plane color uniformity.

The present disclosure has been made in view of such problems, and an object thereof is to provide a light emitting device that can improve in-plane color uniformity, and a lighting device equipped with the same.

A 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, and a light incidence surface that faces the light source and extends in the left and right direction. a wavelength conversion member that is provided between the light source and the light incidence surface and converts at least a portion of the blue light from the light source into red light or green light; Of the optical component and the wavelength conversion member, the wavelength conversion member is provided with a container that accommodates the wavelength conversion member, and the wavelength conversion member is an area surrounded by the optical path of light incident from the light source to the upper and lower ends of the light incidence surface and the light incidence surface. The light emitting device is a direct-type light emitting device.
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, and the light emitting device has a light source and a first light incident surface facing the light source and extending in the left and right direction. and a light guide plate having an uneven surface facing the liquid crystal panel and perpendicular to the first light incidence surface, quantum dots provided between the light source and the first light incidence surface, and extending in the left and right direction. , a light source, a light guide plate, and a container for accommodating the quantum dots among the quantum dots, and the quantum dots are provided with an optical path of light incident from the light source to the upper and lower ends of the first light incidence surface and the first light incidence surface. It traverses the enclosed area and extends to an outer area beyond this area, and the light emitting device is of the 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 includes a light source that emits blue light, and a light incidence surface that faces the light source and extends in the left and right direction. a wavelength conversion member that is provided between the light source and the light incidence surface and converts at least a portion of the blue light from the light source into red light or green light; Of the optical component and the wavelength conversion member, the wavelength conversion member is provided with a container that accommodates the wavelength conversion member, and the wavelength conversion member is an area surrounded by the optical path of light incident from the light source to the upper and lower ends of the light incidence surface and the light incidence surface. 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 includes a light source that emits blue light, and a light incidence surface that faces the light source and extends in the left and right direction. and a wavelength conversion member that is provided between the light source and the light incidence 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 dots are dispersed in resin, and the wavelength conversion member traverses a region surrounded by the optical path of light incident from the light source to the upper end and the lower end of the light entrance surface and the light entrance surface, The light emitting device extends to an outer region beyond this region, 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, and the light emitting device includes a light source including an LED (Light Emitting Diode) and a light emitting device that faces the light source and extends in the left and right direction. a light guide plate having a first light incidence surface that faces the liquid crystal panel and has an uneven surface perpendicular to the first light incidence surface; and a quantum dot provided between the light source and the first light incidence surface. and a container extending in the left-right direction and accommodating the quantum dots among the light source, the light guide plate, and the quantum dots. and the first light incident surface, and extends to an outer region beyond this region, and the light emitting device is a direct-type light emitting device.
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 includes a light source that emits blue light, and a light incidence surface that faces the light source and extends in the left and right direction. and a wavelength conversion member that is provided between the light source and the light incidence surface and converts at least a part of the blue light from the light source into red light or green light. The wavelength converting member is a sheet-like member in which dots are dispersed in resin, and the wavelength converting member crosses an 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. The wavelength conversion member extends to an outer region beyond the region, and includes quantum dots.

In the first to sixth display devices of the present disclosure, image display is performed by selectively transmitting light from the light emitting device through the liquid crystal panel. In this light emitting device, light emitted from a light source is wavelength converted by a wavelength conversion member, travels inside the optical member, is emitted from a light emitting surface, and is observed as light emission. In the first to sixth display devices of the present disclosure, the wavelength conversion member traverses a region surrounded by the optical path of light incident from the light source to the end of the light entrance surface and the light entrance surface, and extends outside beyond this region. It extends to the area. Therefore, out of the light from the light source, the amount of light that does not pass through the wavelength conversion member, that is, the amount of light that is not wavelength-converted by the wavelength conversion member, is reduced.

According to the first to sixth display devices of the present disclosure, the wavelength conversion member crosses the region surrounded by the optical path of the light incident from the light source to the end of the light entrance surface and the light entrance surface, and exceeds this region. Since it extends to the outer region, it is possible to improve the uniformity of color within the plane. Therefore, by configuring a display device or a lighting device using this light-emitting device, it is possible to obtain a high-quality display or lighting.

1 is a perspective view showing the overall configuration of a light emitting device according to a first embodiment of the present disclosure. FIG. 2 is a cross-sectional view showing the arrangement relationship of the light source, light guide plate, and wavelength conversion member shown in FIG. 1. FIG. FIG. 3 is a perspective view showing a bundle of light rays directed from the light source shown in FIG. 2 toward a light incident surface of a light guide plate. FIG. 2 is a cross-sectional view showing the configuration of a light emitting device according to a second embodiment of the present disclosure. FIG. 3 is a cross-sectional view for explaining a case where a light shielding member is not provided. 6 is a plan view schematically showing a light emitting state of the light emitting device shown in FIG. 5. FIG. 6 is a sectional view showing an example of dimensions of the light emitting device shown in FIG. 5. FIG. 8 is a cross-sectional view showing a location from which blue light is emitted in a light emitting device having the dimensions shown in FIG. 7. FIG. 5 is a sectional view showing a modification of the light emitting device shown in FIG. 4. FIG. 5 is a sectional view showing another modification of the light emitting device shown in FIG. 4. FIG. 5 is a sectional view showing still another modification of the light emitting device shown in FIG. 4. FIG. 5 is a sectional view showing still another modification of the light emitting device shown in FIG. 4. FIG. FIG. 7 is a perspective view showing the appearance of a display device according to a third embodiment of the present disclosure. FIG. 14 is an exploded perspective view of the main body shown in FIG. 13; FIG. 15 is an exploded perspective view of the panel module shown in FIG. 14; FIG. 2 is a perspective view showing the appearance of Application Example 1 of the display device. FIG. 7 is a perspective view showing the appearance of Application Example 2. (A) is a perspective view showing the appearance as seen from the front side of Application Example 3, and (B) is a perspective view showing the appearance as seen from the back side. FIG. 7 is a perspective view showing the appearance of Application Example 4; FIG. 7 is a perspective view showing the appearance of Application Example 5. (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 a 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. FIG. 7 is a perspective view showing the appearance of Application Example 7 of the lighting device. FIG. 7 is a perspective view showing the appearance of Application Example 8 of the lighting device. FIG. 7 is a perspective view showing the appearance of Application Example 9 of the lighting device.

Embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the explanation will be given in the following order.
1. First embodiment (light emitting device; a wavelength conversion member traverses a region surrounded by the optical path of light incident from a light source to the end of a light entrance surface and the light entrance surface, and extends to an outside region beyond this region. Extended example)
2. Second embodiment (light emitting device; example in which a light shielding member is provided on the optical path of light from a light source that passes through a container without passing through a wavelength conversion member and goes to a surface in contact with a light incident surface of a light guide plate)
3. Third embodiment (display device; liquid crystal display device)
4. Display device application examples 1 to 6
5. Application examples 7 to 9 of lighting devices

(First embodiment)
FIG. 1 shows the overall configuration of a light emitting device according to a first embodiment of the present disclosure. The 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 indoors, and includes a light source 10, a light guide plate 20, a wavelength conversion member 30, and 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.

In this specification, the stacking direction of the optical sheet 50, the light guide plate 20, and the reflective member 40 is the Z direction (front-back direction), the horizontal direction is the X direction, and the vertical direction is the Y direction on the main surface (the widest surface) of the light guide plate 20. That's what it means.

The light source 10 is a point light source, and specifically includes 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 mounted on a light incident surface 20A of a light guide plate 20 (not shown in FIG. 1). , for example, the left and right end surfaces). The light source substrates 12 have, for example, an elongated rectangular parallelepiped shape, and are arranged in a line in the longitudinal direction of the light source substrates 12.

The light guide plate 20 guides the light from the light source 10 from the light entrance surface 20A to the light exit surface 20B, and is made of transparent material such as polycarbonate resin (PC) or acrylic resin (for example, PMMA (polymethyl methacrylate)). It is mainly composed of thermoplastic resin. The light guide plate 20 has, for example, 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), top, bottom, left and right that are in contact with these.

As described above, the left and right end surfaces of the light guide plate 20 serve as the light entrance surfaces 20A into which the light from the light source 10 enters. Note that the light incident surface 20A may be only one of the left and right end surfaces of the light guide plate 20. Further, the light incident surface 20A may be three end surfaces of the light guide plate 20, or may be all four end surfaces.

The front and back surfaces of the light guide plate 20 are light output surfaces 20B and 20D that output the light that has entered from the light input surface 20A. The light exit surface 20B (front surface) and the light exit surface 20D (back surface) of the light guide plate 20 correspond to, for example, an object to be irradiated (for example, the liquid crystal panel 122 described below) arranged on the light exit surface 20B side of the light guide plate 20. It has a planar shape.

The light exit surface 20B (front surface) of the light guide plate 20 is provided with a concavo-convex pattern consisting of, for example, minute convex portions 20C in order to improve the straightness of light propagating within the light guide plate 20. The convex portion 20C is, for example, a strip-shaped protrusion or ridge extending in one direction (for example, the left-right direction) of the light exit surface 20B.
For example, a scattering agent is printed in a pattern on the light exit surface 20D (back surface) of the light guide plate 20 as a scattering portion that scatters and makes the light propagating within the light guide plate 20 uniform.
In addition, as a scattering part, it is also possible to provide a part containing a filler instead of a scattering agent, or to make the surface partially rough.

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. It is preferable that the wavelength conversion member 30 includes, for example, a fluorescent substance. Specifically, the light source 10 is a blue light source, and the wavelength conversion member 30 preferably includes a fluorescent substance that converts the wavelength of the blue light from the light source 10 into red light or green light. Thereby, in this light emitting device 1, by combining the red light and the green light whose wavelengths have been converted by the wavelength conversion member 30, it is possible to generate light of various tones.

Furthermore, it is preferable that the wavelength conversion member 30 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 wavelength of blue light from the light source 10 into red light or green light. Quantum dots have discrete energy levels, and the emission wavelength can be freely selected by changing the size of the dots. The resulting red and green light spectra have narrow half-widths and steep peaks. Therefore, the color purity of red light and green light becomes high, and the color gamut of their combined light becomes wide. Therefore, it is possible to expand the color gamut compared to a conventional light emitting device using a white LED and a fluorescent substance.

The reflecting member 40 is a plate-like or sheet-like member provided on the light exit surface 20D (back surface) side of the light guide plate 20, and reflects light 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 toward the light exit surface 20D is directed back toward the light guide plate 20. The reflective member 40 has, for example, functions such as reflection, diffusion, and scattering, thereby making it possible to efficiently utilize the light from the light source 10 and increase front brightness.

The reflective member 40 is made of, for example, foamed PET (polyethylene terephthalate), a silver-deposited film, a multilayer reflective film, or white PET. When the reflective member 40 is provided with a regular reflection (specular reflection) function, the surface of the reflective member 40 is preferably treated with silver vapor deposition, aluminum vapor deposition, multilayer film reflection, or the like. When providing the reflective member 40 with a fine shape, the reflective member 40 may be integrally formed using a method such as hot press molding or melt extrusion molding using a thermoplastic resin, or may be formed using, for example, PET. The shape may be formed by applying an energy ray (for example, ultraviolet) curable resin onto a base material made of a material such as the like, and then transferring the shape to the energy ray curable resin. Examples of thermoplastic resins include polycarbonate resins, acrylic resins such as PMMA (polymethyl methacrylate resin), polyester resins such as polyethylene terephthalate, and amorphous resins such as MS (copolymer of methyl methacrylate and styrene). Examples include polymerized polyester resins, polystyrene resins, and polyvinyl chloride resins. Furthermore, when transferring the shape to an energy ray (for example, ultraviolet ray) cured resin, the base material may be glass.

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, and the like. In FIG. 1, only one of the plurality of optical sheets 50 is shown. By providing such an optical sheet 50, it becomes possible to raise the light emitted obliquely from the light guide plate 20 in the front direction, and it becomes possible to further increase the front brightness.

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. . As described above, the light source 10 is arranged to face the light entrance surface 20A of the light guide plate 20, and the wavelength conversion member 30 is arranged between the light source 10 and the light entrance surface 20A. A reflective member 40 is laid on the light exit surface 20D (back surface) side of the light guide plate 20.

The wavelength conversion member 30 is preferably housed 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 characteristics of the wavelength conversion member 30 caused by moisture and oxygen in the atmosphere, and to facilitate handling. Note that such a wavelength conversion member 30 is made by, for example, kneading a fluorescent substance or quantum dots into an ultraviolet curable resin, placing the obtained mixture in a container 31 such as a glass tube, and sealing one side of the container 31. It can be manufactured by curing the resin by irradiating ultraviolet rays to form a gel-like wavelength conversion member 30 having a certain degree of viscosity.

The wavelength conversion member 30 crosses a region S1 surrounded by the light entrance surface 20A and the optical paths of the lights ν1 and ν2 that enter the ends (upper end 20E and lower end 20F) of the light entrance surface 20A from the light source 10, and crosses this region S1. It extends to the outer region S2 beyond which it exceeds. Thereby, in this light emitting device 1, it is possible to improve in-plane color uniformity.

The light source 10 and wavelength conversion member 30 shown in FIG. 2 are held by, for example, a fixing member (holder) 60. The fixing member 60 is made of highly reflective polycarbonate resin, polyamide resin (for example, “Genestar (trade name)” manufactured by Kuraray), etc., and includes, for example, a first fixing portion 61 that holds the light source 10 and the wavelength conversion member 30. It has a second fixing part 62 and a third fixing part 63 that hold the.

The first fixing part 61 is a part to which the light source board 12 carrying the light source 10 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 portion 61D is provided on the outer surface 61A side of the opening 61C by recessing the periphery of the opening 61C in a stepwise manner. Therefore, by fixing the light source board 12 to the seat portion 61D, the package 11 with the light source 10 mounted thereon can be loosely fitted 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. Furthermore, it is desirable that a part or all of the inner surface 61B be an inclined surface in order to improve the efficiency of using light from the light source 10.

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

Furthermore, the end of the light guide plate 20 and the end of the reflective member 40 are sandwiched and held between the tip of the second fixing part 62 and the tip of the third fixing part 63. Note that it is sufficient for the second fixing part 62 and the third fixing part 63 to sandwich at least the upper and lower ends of the container 31, and the ends of the light guide plate 20 and the ends of the reflective member 40 are secured by other members (described later). It is also possible to hold it.

Note that a heat dissipation member (heat spreader), not shown, is attached to the outside of such fixing member 60, particularly around the light source 10. Further, the entire light emitting device 1 including the light source 10 to the fixing member 60 and the heat dissipating member (not shown) is housed in a casing (not shown in FIGS. 1 and 2; see, for example, the rear casing 124 in FIG. 15). ).

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 entrance surface 20A of the light guide plate 20, travels inside the light guide plate 20, and exits from the light exit surface 20B, The light passes through the optical sheet 50 and is observed as light emission.

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 by 360 degrees from the light emission center 10A. As shown in FIG. 3, since the wavelength conversion member 30 and the light entrance surface 20A are long in the left-right direction, the spread of light in the left-right direction does not pose a particular problem. On the other hand, part of the light that has spread in the vertical direction may deviate above the upper end 20E of the light incidence surface 20A or below the lower end 20F.

Here, as shown in FIG. 2, the wavelength conversion member 30 is surrounded by the light entrance surface 20A and the optical path of the lights ν1 and ν2 that enter the ends (upper end 20E and lower end 20F) of the light entrance surface 20A from the light source 10. traverses the area S1. In other words, the wavelength conversion member 30 intersects (crosses) the region S1 in a direction parallel to the light incidence surface 20A. Therefore, the light that passes through the region S1 and enters the light entrance surface 20A can undergo wavelength conversion by the wavelength conversion member 30.

Furthermore, the wavelength conversion member 30 extends beyond this region S1 to an outer region S2. That is, the wavelength conversion member 30 is provided so as to protrude from the region S1 and cover the outer region S2. Therefore, even the light that comes out from the light source 10, spreads in the vertical direction, and travels outside the region S1 can be captured by the wavelength conversion member 30 to some extent and undergo wavelength conversion. Therefore, in this light emitting device 1, out of the light from the light source 10, the amount of light that does not pass through the wavelength conversion member 30, that is, the amount of light that is not wavelength converted by the wavelength conversion member 30, is reduced, and the uniformity of color within the plane is improved.

As described above, in the present embodiment, the wavelength conversion member 30 is arranged in an area surrounded by the optical paths of the lights ν1 and ν2 that enter the ends (upper end 20E and lower end 20F) of the light entrance surface 20A from the light source 10 and the light entrance surface 20A. It traverses S1 and extends to an outer region S2 beyond this region S1. Therefore, it is possible to reduce the amount of light that does not pass through the wavelength conversion member 30, that is, the light that is not wavelength-converted by the wavelength conversion member 30, among the light from the light source 10, and improve the uniformity of color within the plane.

(Second embodiment)
FIG. 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 reduces color unevenness occurring in the vicinity of the light incidence surface 20A by providing a light shielding member 70 between the container 31 of the wavelength conversion member 30 and the light incidence surface 20A of the light guide plate 20. This further improves the uniformity of color. Other than this, the light emitting device 1A has the same configuration, operation, and effects as the first embodiment. Therefore, corresponding components will be described with the same reference numerals.

The light source 10, package 11, light source substrate 12, light guide plate 20, wavelength conversion member 30, container 31, reflection member 40, and optical sheet 50 are configured similarly to the first embodiment.

As in the first embodiment, the fixing member 60 includes a first fixing part 61 that holds the light source 10, and a second fixing part 62 and a third fixing part 63 that hold the wavelength conversion member 30. There is.

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, the seat 61D on the outer surface 61A side of the opening 61C is not provided, and the light source board 12 is fixed to the outer surface 61A, so that the package 11 with the light source 10 mounted thereon can be gently inserted into the opening 61C. It's becoming addictive.

The second fixing part 62 holds the upper end of the container 31 of the wavelength conversion member 30 by sandwiching it between the second fixing part 62 and the third fixing part 63 . In addition, in FIG. 4, the optical sheet 50 is arranged on the light exit surface 20B of the light guide plate 20, and the end of this optical sheet 50 is not connected to the second fixing part 62 but to the frame member 80 (FIG. 15). ). The frame-shaped member 80 is a frame-shaped resin component that holds the optical sheet 50, and is a so-called middle chassis.

The third fixing part 63 holds the lower end of the container 31 of the wavelength conversion member 30 between it and the second fixing part 62 . The tip of the third fixing portion 63 extends to the light exit surface 20D (back surface) of the light guide plate 20 and the back side of the reflective member 40.

The light shielding member 70 blocks the light ν3 from the light source 10 that passes through the container 31 without passing through the wavelength conversion member 30 and heads toward the surface in contact with the light incident surface 20A of the light guide plate 20, that is, the light exit surface 20B or the light exit surface 20D. It is installed on the optical path.

That is, as shown in FIG. 5, when the light shielding member 70 is not provided, the light ν3 passes through the gap between the fixing member 60 and the frame member 80, enters the optical sheet 50, and is directly transmitted to the outside. There is a risk that they will leave. In this case, the light ν3 is not subjected to 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 is generated from the light source 10. The blue light remains as it is. Therefore, as schematically shown in FIG. 6, when the light emitting device 1 is viewed from the front side of the optical sheet 50, there is a strong bluish color unevenness B caused by the light ν3 along the left and right sides where the light source 10 is provided. is observed.

The location 31A where the light ν3, which causes such color unevenness B, is emitted from the container 31 can be determined by the numerical value if specific numerical values of the dimensions and positional relationship of the light source 10, the light guide plate 20, and the wavelength conversion member 30 are given. It is possible to specify based on For example, as shown in FIG. 7, the dimension t1 from the upper end to the lower end 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 entrance surface 20A is 1.4 mm. The thickness (difference between the outer diameter and the inner diameter) R of the container 31 is 1 mm, and the refractive index n of the container 31 is 1.51.

In this case, as shown in FIG. 8, the emission point 31A of the light ν3 that causes color unevenness B is located at a distance L in the horizontal direction from the light emission center 10A of the light source 10 of 1.95 mm to 2.16 mm and in the height direction. The distance t is limited to a range of 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 ν3 and suppress the color unevenness B. In addition, in FIG. 8, the emission location 31A of the light ν3, which causes the color unevenness B, is represented by a thicker line than the contour line of the container 31.

Specifically, the light shielding member 70 is preferably a light shielding protrusion 71 provided on the second fixing part 62 and the third fixing part 63 of the fixing member 60, as shown in FIG. By doing this, it becomes possible to block the light ν3 at a position extremely close to the emission point of the light ν3, which causes the color unevenness B, and it becomes possible to reliably suppress the occurrence of the color unevenness B. Furthermore, the light shielding member 70 can be easily formed in the manufacturing process of the fixing member 60 made of a resin component.

Further, it is also preferable that the light shielding member 70 is a light shielding protrusion 72 provided on a frame member 80, as shown in the light emitting device 1B of FIG. In this case, the light shielding member 70 can be easily formed in the manufacturing process of the frame member 80 made of a resin component.

Furthermore, as shown in the light emitting device 1C in FIG. 10, the light shielding member 70 is a light shielding cushion 73 that covers the surface of the light guide plate 20 that is in contact with the light incident surface 20A, specifically, the end of the light exit surface 20B. It is also preferable. In this case, unlike the light-shielding protrusions 71 and 72 shown in FIG. 4 or 9, it is possible to suppress light from being kicked by the light-shielding protrusions 71 and 72, and it is possible to further improve the light utilization efficiency. It becomes possible. Moreover, it is preferable that the light shielding cushion 73 is sandwiched between the frame member 80 and the light exit surface 20B of the light guide plate 20. This adjusts the mechanical clearance between the frame member 80 and the light guide plate 20, or reduces the sound generated when the frame member 80 made of different materials and the light guide plate 20 come into contact. becomes possible. As a constituent material of the light shielding cushion 73, for example, urethane foam (“PORON (registered trademark)” manufactured by Rogers INOAC Co., Ltd.) is preferable.

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

Furthermore, as shown in the light emitting device 1E of FIG. It is also preferred to provide a lower cushion 74. By doing so, the light that passes through the container 31 from the light source 10 without passing through the wavelength conversion member 30 and heads toward the surface in contact with the light incident surface 20A of the light guide plate 20, that is, the light output surface 20D, is blocked, and this light is blocked. It is possible to suppress color unevenness caused by light. Further, in addition to blocking light, the lower cushion 74 also has a clearance adjustment function and an abnormal noise prevention function similar to the light blocking cushion 73 described above. As a constituent material of the lower cushion 74, for example, polyethylene foam (“Super Opcel (registered trademark)” manufactured by Sanwa Kako Co., Ltd.) is preferable.

In addition, as shown in FIGS. 4, 9 to 12, it is preferable that the end portion 41 of the reflecting member 40 protrudes further toward the light source 10 than the light guide plate 20. This blocks light from the light source 10 that passes through the container 31 without passing through the wavelength conversion member 30 and heads toward the surface in contact with the light incident surface 20A of the light guide plate 20, that is, the light output surface 20D, and the light caused by this light is blocked. It becomes possible to suppress color unevenness. Furthermore, even higher effects can be obtained by combining the third fixing part 63 with the light-shielding protrusion 71 shown in FIG. 4 or with the lower cushion 74 shown in FIG. 12.

In the light emitting devices 1A to 1E, similarly to 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, and the light emitted from the light guide plate 20 is The light travels inside, exits from the light exit surface 20B, passes through the optical sheet 50, and is observed as light emission.

At that time, light ν3 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 (light exit surface 20B or light exit surface 20D) in contact with the light entrance surface 20A of the light guide plate 20. . This light ν3 passes through the gap between the fixing member 60 and the frame member 80, passes through the optical sheet 50, and exits to the outside as it is, causing the strong bluish color unevenness B shown in FIG. There is a risk that this will occur. Here, since the light blocking member 70 is provided on the optical path of such light ν3, this light blocking member 70 blocks the light ν3 that causes the color unevenness B, thereby improving the in-plane color uniformity. Further improvement.

Note that, as shown in FIGS. 4, 9 to 12, light from the light source 10 passes through the container 31 without passing through the wavelength conversion member 30, and passes through the gap between the fixing member 60 and the frame member 80. There is also light ν4 incident on 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, there is little risk of causing a major problem such as color unevenness B caused by light ν3. Further, even when the light ν3 is incident on the light exit surface 20B or the 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.

In this embodiment, the light source 10 passes through the container 31 without passing through the wavelength conversion member 30 and reaches the surface in contact with the light incident surface 20A of the light guide plate 20, that is, the light exit surface 20B or the light exit surface 20D. Since the light blocking member 70 is provided on the optical path of the oncoming light ν3, it is possible to block the light ν3 that causes color unevenness and further improve the in-plane color uniformity.

(Third embodiment)
FIG. 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 portion 102 for displaying images is supported by a stand 103. Note that the display device 101 can be used as a stationary type by being placed on a horizontal surface such as a floor, shelf, or stand with the stand 103 attached to the main body 102; It is also possible to use it as a wall-mounted type.

FIG. 14 shows an exploded view of the main body section 102 shown in FIG. 13. The main body 102 includes, 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. The panel module 112 is fixed to the front exterior member 111, and on the back thereof, a power supply board 115 and a signal board 116 are mounted, and a mounting bracket 117 is fixed. The mounting bracket 117 is used for mounting a wall bracket, a board, etc., and the stand 103. The rear exterior member 113 covers the back and side surfaces of the panel module 112.

FIG. 15 shows an exploded view of the panel module 112 shown in FIG. 13. For example, the panel module 112 includes, 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, and a reflective 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.

The front housing 121 is a frame-shaped metal component 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. The frame member 123 is a frame-shaped resin component that holds the liquid crystal panel 122 and the optical sheet 50. The rear housing 124 is a metal component 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 back surface of the rear housing 124 and covered by a balancer cover 126. A timing controller board 127 is also mounted on the back surface of the rear housing 124.

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. 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.

Note that in the above embodiment, a case has been described in which the display device 101 includes the light emitting device 1 according to the first embodiment, but the display device 101 includes the light emitting device 1 according to the first embodiment. It goes without saying that any one of the light emitting devices 1A to 1E according to the second embodiment may be included instead.

(Application example of display device)
An example of application of the display device 101 as described above to an electronic device will be described below. Examples of electronic devices include television devices, digital cameras, notebook personal computers, mobile terminal devices such as mobile phones, and video cameras. In other words, the 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.

(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 section 210 and a non-display section 220, and this display section 210 is configured by the display device 101 of the above embodiment.

(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 section 230 and a non-display section 240, and this display section 230 is configured by the display device 101 of the above embodiment.

(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 flash light emitting section 410, a display section 420, a menu switch 430, and a shutter button 440, and this display section 420 is configured by the display device 101 of the above embodiment.

(Application example 4)
FIG. 19 shows the external appearance of a notebook personal computer to which the display device 101 of the above embodiment is applied. This notebook personal computer includes, for example, a main body 510, a keyboard 520 for inputting characters, and a display section 530 for displaying images. It is configured.

(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 includes, for example, a main body part 610, a lens 620 for photographing a subject provided on the front side of the main body part 610, a start/stop switch 630 for photographing, and a display part 640. This display section 640 is configured by the display device 101 of the above embodiment.

(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 has, for example, an upper housing 710 and a lower housing 720 connected by a connecting part (hinge part) 730, and includes a display 740, a sub-display 750, a picture light 760, and a camera 770. There is. Of these, display 740 or sub-display 750 is configured by display device 101 of the above embodiment.

(Application example of lighting device)
22 and 23 show the appearance of a tabletop lighting device to which the light emitting devices 1, 1A to 1E of the above embodiments are applied. In this lighting device, for example, a lighting section 843 is attached to a support 842 provided on a base 841, and this lighting section 843 is the light emitting device 1 according to the first and second embodiments. It is composed of any one of 1A to 1E. By forming the light guide plate 20 into a curved shape, the illumination section 843 can have any shape, such as the cylindrical shape shown in FIG. 22 or the curved shape shown in FIG. 23.

FIG. 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 includes, for example, a lighting section 844 configured by one of the light emitting devices 1, 1A to 1E according to the embodiments described above. The lighting units 844 are arranged in an appropriate number and at appropriate intervals on the ceiling 850A of the building. Note that the lighting section 844 can be installed not only on the ceiling 850A but also on the wall 850B or the floor (not shown), depending on the purpose.

In these lighting devices, illumination is performed using 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 illumination quality is improved.

Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above embodiments, and various modifications are possible. For example, the material and thickness of each layer described in the above embodiments are not limited, and other materials and thicknesses may be used.

Further, for example, in the above embodiment, a case has been described in which the light source 10 is an LED, but the light source 10 may be constituted by a semiconductor laser or the like.

Furthermore, for example, although the configurations of the light emitting devices 1, 1A to 1E and the display device 101 (television device) have been specifically listed and explained in the above embodiments, it is not necessary to include all the components, and other components may be included. It may further include the following components.

In addition, in the above embodiment, a case has been described in which the wavelength conversion member 30 is enclosed in the container 31, but the wavelength conversion member 30 is a sheet-like member in which fluorescent material or quantum dots are dispersed in a resin sheet. Good too.

Furthermore, in the above embodiment, the edge light type light emitting device 1 was described 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 emitting surface 20B toward the front. 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 the light sources as an optical component.

Note that the present technology can also have the following configuration.
(1)
comprising 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 having a light incident surface facing the light source and extending in the left-right direction;
a wavelength conversion member that is provided between the light source and the light incidence surface and converts at least a part 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;
The wavelength conversion member traverses a region surrounded by the light entrance surface and an optical path of light that enters the upper and lower ends of the light entrance surface from the light source, and extends to an outside region beyond this region. Ori,
The light emitting device is a direct type display device.
(2)
The display device according to (1) above, wherein the display panel is a liquid crystal display panel.
(3)
Furthermore, it includes a light shielding member,
(1) above, wherein the light shielding member is provided on an optical path of light from the light source that passes through the container without passing through the wavelength conversion member and heads toward a surface in contact with the light incident surface of the optical component; or The display device according to (2) above.
(4)
The display device according to (3), wherein the light shielding member is a light shielding cushion that covers an end of a surface of the optical component that is in contact with the light incident surface.
(5)
Furthermore, an optical sheet provided on a surface of the optical component that is in contact with the light incident surface;
a frame-like member that holds the optical sheet;
The display device according to (4), wherein the light shielding cushion is sandwiched between the frame member and the optical component.
(6)
The display device according to any one of (1) to (5), wherein the wavelength conversion member includes a fluorescent substance.
(7)
The display device according to any one of (1) to (5), wherein the wavelength conversion member includes a quantum dot.
(8)
comprising 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 and
a light guide plate having a first light incident surface facing the light source and extending in the left-right direction, and having an uneven surface facing the liquid crystal panel and perpendicular to the first light incident surface;
a quantum dot provided between the light source and the first light incidence surface;
a container extending in the left-right direction and accommodating the quantum dots among the light source, the light guide plate, and the quantum dots;
The quantum dots traverse a region surrounded by the first light entrance surface and the optical path of light that enters the upper and lower ends of the first light entrance surface from the light source, and extend to an outside region beyond this region. is present,
The light emitting device is a direct type display device.
(9)
Furthermore, a plurality of the light sources;
The display device according to any one of (1) to (8), including at least one light source substrate on which a plurality of the light sources are mounted.
(10)
comprising 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 having a light incident surface facing the light source and extending in the left-right direction;
a wavelength conversion member that is provided between the light source and the light incidence surface and converts 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;
The wavelength conversion member traverses a region surrounded by the light entrance surface and an optical path of light that enters the upper and lower ends of the light entrance surface from the light source, and extends to an outside region beyond this region. Ori,
The wavelength conversion member includes a quantum dot. Display device.
(11)
Furthermore, a plurality of the light sources;
The display device according to (10), further comprising at least one light source substrate on which a plurality of the light sources are mounted.
(12)
comprising 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 having a light incident surface facing the light source and extending in the left-right direction;
a wavelength conversion member that is provided between the light source and the light incidence surface and converts the wavelength of 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 is configured to connect an optical path of light incident from the light source to the upper end and lower end of the light incidence surface and the light incidence surface. traverses the area bounded by the plane and extends to the outer area beyond this area,
The light emitting device is a direct type display device.
(13)
The display device according to (12) above, wherein the display panel is a liquid crystal display panel.
(14)
Furthermore, it includes a light shielding member,
The display device according to (13), wherein the light shielding member is a light shielding cushion that covers an end of a surface of the optical component that is in contact with the light incident surface.
(15)
Furthermore, an optical sheet provided on a surface of the optical component that is in contact with the light incident surface;
a frame-like member that holds the optical sheet;
The display device according to (14), wherein the light shielding cushion is sandwiched between the frame member and the optical component.
(16)
comprising 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 having a first light incident surface facing the light source and extending in the left-right direction, and having an uneven surface facing the liquid crystal panel and perpendicular to the first light incident surface;
a quantum dot provided between the light source and the first light incidence surface;
a container extending in the left-right direction and accommodating the quantum dots among the light source, the light guide plate, and the quantum dots;
The quantum dots traverse a region surrounded by the first light entrance surface and the optical path of light that enters the upper and lower ends of the first light entrance surface from the light source, and extend to an outside region beyond this region. is present,
The light emitting device is a direct type display device.
(17)
Furthermore, a plurality of the light sources;
The display device according to (16), further comprising at least one light source substrate on which a plurality of the light sources are mounted.
(18)
comprising 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 having a light incident surface facing the light source and extending in the left-right direction;
a wavelength conversion member that is provided between the light source and the light incidence surface and converts the wavelength of 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 is configured to connect an optical path of light incident from the light source to the upper end and lower end of the light incidence surface and the light incidence surface. traverses the area bounded by the plane and extends to the outer area beyond this area,
The wavelength conversion member includes a quantum dot. Display device.
(19)
Furthermore, a plurality of the light sources;
The display device according to (18), further comprising at least one light source substrate on which a plurality of the light sources are mounted.

1, 1A to 1E...Light emitting device, 10...Light source, 10A...Light emission center, 11...Package, 12...Light source board, 20...Light guide plate, 20A...Light incidence surface, 20B, 20D...Light exit surface, 20C...Convex part , 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 part, 61A... outer surface, 61B...Inner surface, 61C...Opening, 61D...Seat portion, 62...Second fixing part, 63...Third fixing part, 70...Light shielding member, 71, 72...Light shielding protrusion, 73...Light shielding cushion, 74...Lower side Cushion, 80...Frame member, 101...Display device.

Claims (17)

a light source sealed in a package and mounted on a light source board;
an optical component including a light entrance surface facing the light source;
a wavelength conversion member that is provided between the light source and the light incidence surface and converts the wavelength of at least part of the light from the light source from a first wavelength to a second wavelength different from the first wavelength; Equipped with
The wavelength conversion member converts the light of the first wavelength into red light or green light as light of the second wavelength. The light emitting device. The wavelength conversion member traverses a first region surrounded by the light entrance surface and an optical path of light emitted from the light source and enters an end of the light entrance surface, and extends beyond the first region. The light emitting device according to claim 1, wherein the light emitting device extends to the second region. A lighting device comprising the light emitting device according to claim 1 or 2 as a lighting section having a curved surface. The light emitting device according to claim 1 or 2, further comprising a container that encloses the wavelength conversion member. 5 . The optical device further includes a light shielding member provided on an optical path of light from the light source that passes through the container without passing through the wavelength conversion member and goes to a surface in contact with the light incident surface of the optical component. Light emitting device. The light-emitting device according to claim 5, wherein the light-shielding member is a light-shielding cushion that covers an end of a surface of the optical component that is in contact with the light incident surface. an optical sheet provided on a surface of the optical component that is in contact with the light incident surface;
further comprising a frame-like member that holds the optical sheet,
The light emitting device according to claim 6, wherein the light shielding cushion is sandwiched between the frame member and the optical component. The light emitting device according to claim 1 or 2, wherein the optical component is a light guide plate. The light emitting device according to claim 1 or 2, wherein the optical component is a light guide plate having a curved shape. The light emitting device according to claim 1 or 2, wherein the wavelength conversion member includes a quantum dot. further comprising a fixing member to which the light source board is attached,
The light emitting device according to claim 1 or 2, wherein the light source substrate is provided in a recess of a seat portion of the fixing member. The light emitting device according to claim 11, wherein the seat 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 1 or 2, wherein the wavelength conversion member is a sheet-like member made of a resin in which quantum dots are dispersed. a reflecting member provided on the light output surface of the optical component; a frame-shaped member that holds the wavelength conversion member and extends so as to cover the light output surface of the optical component;
The light emitting device according to claim 1 or 2, further comprising: a light shielding member sandwiched between the frame member and the reflective member. The light emitting device according to claim 1 or 2, which is a direct type. The light emitting device according to claim 1 or 2, which is an edge light type. The light emitting device according to claim 4, further comprising at least one holding member that holds the container by sandwiching an upper end of the container and a lower end of the container.

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