WO2016111086A1

WO2016111086A1 - Light emitting device, display device and lighting device

Info

Publication number: WO2016111086A1
Application number: PCT/JP2015/081942
Authority: WO
Inventors: 大川　真吾
Original assignee: ソニー株式会社
Priority date: 2015-01-06
Filing date: 2015-11-13
Publication date: 2016-07-14

Abstract

This light emitting device comprises: a plurality of light sources which are arranged on a substrate and emit first-wavelength light; a light diffusion member which covers the plurality of light sources; a plurality of wavelength conversion members which are arranged between the light sources and the light diffusion member in the thickness direction, while being arranged in regions respectively corresponding to the plurality of light sources in a plane, and which convert the first-wavelength light from the light sources into second-wavelength light; and a plurality of light beam control members which are respectively arranged between the plurality of light sources and the plurality of wavelength conversion members, and which control the direction of travel of the first-wavelength light.

Description

LIGHT EMITTING DEVICE, DISPLAY DEVICE, AND LIGHTING DEVICE

The present disclosure relates to a light emitting device, and a display device and a lighting device including the light emitting device.

A light emitting device using a blue LED (Light Emitting Diode) is adopted as a backlight or a lighting device of a liquid crystal display device. For example, Patent Document 1 discloses a so-called direct-type backlight that forms white light by a combination of a plurality of blue LEDs arranged on a substrate and a wavelength conversion sheet covering the whole. Yes. Patent Document 2 discloses a surface light source that forms white light in which a blue LED, a reflector, a diffusion sheet, and a phosphor layer that performs wavelength conversion are sequentially laminated.

JP 2012-155999 A International Publication No. 2010/150516

However, in Patent Document 1, it is considered that yellow tends to be stronger in the vicinity of the blue LED than directly above. Moreover, in the said patent document 2, the structure is complicated and there exists a possibility that the difference in the brightness | luminance of the area | region right above a blue LED and the area | region of the periphery may be recognized as a particle irregularity. Generally, in a light emitting device used as a surface light source, it is strongly desired to efficiently emit light with less luminance unevenness and color deviation in the surface.

Therefore, it is desirable to provide a light emitting device capable of emitting light having higher uniformity in a plane, and a display device and an illumination device including the light emitting device.

A light-emitting device according to an embodiment of the present disclosure includes a plurality of light sources that are arranged on a substrate and emits first wavelength light, a light diffusion member that covers the plurality of light sources, and a light source and a light diffusion member in the thickness direction. And a plurality of wavelength conversion members that are arranged in a region corresponding to the plurality of light sources in the plane and convert the first wavelength light from the light sources into the second wavelength light, and the plurality of light sources And a plurality of light beam control members that are respectively disposed between the plurality of wavelength conversion members and control the traveling direction of the first wavelength light. In addition, a display device and a lighting device as an embodiment of the present disclosure include the light emitting device.

In the light emitting device, the display device, and the lighting device according to the embodiment of the present disclosure, the plurality of wavelength conversion members are disposed between the light source and the light diffusion member in the thickness direction, and each of the plurality of light sources in the plane. It is placed in the corresponding area. By doing so, the wavelength conversion to the second wavelength light is appropriately performed while reducing the intensity of the first wavelength light that is directly incident on the light diffusing member from the light source. In addition, the amount of wavelength conversion member used is reduced as compared with the case where a single sheet-like wavelength conversion member is provided over the entire surface. Further, a light beam control member for controlling the traveling direction of the first wavelength light is provided between the light source and the wavelength conversion member. Thereby, the intensity of the first wavelength light directly incident on the light diffusion member from the light source is further reduced, and the intensity distribution of the first wavelength light incident on the wavelength conversion member is further flattened.

According to the light emitting device as an embodiment of the present disclosure, it is possible to emit light having higher uniformity in the plane while suppressing deterioration of the wavelength conversion member. That is, light with less luminance unevenness and color deviation can be efficiently emitted in the plane. For this reason, according to the display device using this light emitting device, display performance excellent in color reproducibility and the like can be exhibited. Moreover, according to the illuminating device using this light-emitting device, more homogeneous illumination can be performed on the object. In addition, the effect of this indication is not limited to this, Any effect described below may be sufficient.

It is a perspective view showing the example of whole composition of a light emitting device concerning a 1st embodiment in this indication. It is a perspective view showing the structure of the principal part of the light-emitting device shown in FIG. It is another perspective view showing the structure of the principal part of the light-emitting device shown in FIG. It is sectional drawing showing the structure of the principal part of the light-emitting device shown in FIG. It is sectional drawing showing the 1st modification of the light beam control member shown to FIG. 3A. It is an expanded sectional view showing the detail of the light beam control member shown in FIG. 3A. It is explanatory drawing for demonstrating the method to prescribe | regulate the radius of the wavelength conversion member in the light-emitting device shown in FIG. It is a perspective view showing the 2nd modification of the light beam control member shown in Drawing 3A. It is sectional drawing showing the 2nd modification of the light beam control member shown to FIG. 3A. 14 is a perspective view illustrating an appearance of a display device according to a second embodiment of the present disclosure. FIG. FIG. 6 is an exploded perspective view showing the main body shown in FIG. 5. FIG. 6B is a perspective view illustrating the panel module illustrated in FIG. 6A in an exploded manner. It is a perspective view showing the external appearance of the electronic book (application example 1) carrying the display apparatus of this indication. It is a perspective view showing the external appearance of the other electronic book (application example 1) carrying the display apparatus of this indication. It is a perspective view showing the external appearance of the smart phone (application example 2) carrying the display apparatus of this indication. It is a perspective view showing the external appearance from the front of the digital camera (application example 3) carrying the display apparatus of this indication. It is a perspective view showing the appearance from the back of a digital camera (application example 3) carrying a display device of this indication. It is a perspective view showing the external appearance of the notebook type personal computer (application example 4) carrying the display apparatus of this indication. It is a perspective view showing the external appearance of the video camera (application example 5) carrying the display apparatus of this indication. FIG. 7 is a front view, a left side view, a right side view, a top view, and a bottom view showing an external appearance of a cellular phone (Application Example 6) in which the display device of the present disclosure is mounted in a closed state. It is the front view and side view showing the external appearance of the open state of the mobile telephone (application example 6) carrying the display apparatus of this indication. It is a perspective view showing the external appearance of the 1st illuminating device (application example 7) provided with the light-emitting device of this indication. It is a perspective view showing the external appearance of the 2nd illuminating device (application example 8) provided with the light-emitting device of this indication. It is a perspective view showing the external appearance of the 3rd illuminating device (application example 9) provided with the light-emitting device of this indication. It is a top view showing the plane shape of the part right above a wavelength conversion part and the plane shape of a light reflection member in example 1 of an experiment. FIG. 10 is a plan view illustrating a planar shape of a portion immediately above a wavelength conversion unit and a planar shape of a light reflecting member in Experimental Example 2. In a reference example, it is a top view showing the plane shape of the portion right above a wavelength conversion part, and the plane shape of a light reflection member. It is sectional drawing showing the shape and dimension of a light beam control member in example 1 of an experiment. It is sectional drawing showing the shape and dimension of a light beam control member in example 2 of an experiment. It is sectional drawing showing the optical path of the 1st wavelength light which goes to the wavelength conversion part from the light source in Experimental example 1. FIG. It is sectional drawing showing the optical path of the 1st wavelength light which goes to the wavelength conversion part from the light source in Experimental example 2. FIG. It is sectional drawing showing the optical path of the 1st wavelength light which goes to a wavelength conversion part from a light source in a reference example. It is a characteristic view showing the illuminance distribution of the 1st wavelength light which goes to a wavelength conversion part from the light source in Experimental example 1. FIG. It is a characteristic view showing the illuminance distribution of the 1st wavelength light which goes to a wavelength conversion part from the light source in Experimental example 2. FIG. It is a characteristic view showing the illumination intensity distribution of the 1st wavelength light which goes to a wavelength conversion part from a light source in a reference example. It is a characteristic view which compares and represents the luminance distribution of the 1st wavelength light which goes to the wavelength conversion part from a light source in Experimental example 1, 2 and a reference example. It is sectional drawing showing the shape and dimension of a light beam control member in example 3 of an experiment. It is sectional drawing showing the optical path of the 1st wavelength light which goes to the wavelength conversion part from the light source in Experimental example 3. FIG. FIG. 6 is a characteristic diagram showing the relationship between the incident angle and the exit angle for the light beam control member used in each sample of Experimental Examples 1 to 3 and Reference Example. It is sectional drawing showing the shape and dimension of the 3rd modification of a light beam control member. It is sectional drawing showing the optical path of the 1st wavelength light which goes to the wavelength conversion part from the light source in the light-emitting device using the light beam control member as a 3rd modification. It is a top view showing the semi-transmissive member as a light beam control member. It is sectional drawing showing the semi-transmissive member shown to FIG. 24A.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be given in the following order.
1. First Embodiment A light emitting device having a plurality of light beam control members at positions corresponding to respective light sources.
2. Second embodiment (display device; liquid crystal display device)
3. 3. Application example of display device 4. Application example of lighting device Experimental example

<First Embodiment>
[Configuration of Light Emitting Device 1]
FIG. 1 illustrates an overall configuration of a light emitting device 1 as a first embodiment of the present disclosure. 2A and 2B are perspective views illustrating an enlarged main part of the light emitting device 1. Further, FIG. 3A is an enlarged cross-sectional view illustrating a main part of the light emitting device 1. The light emitting device 1 is used, for example, as a backlight that illuminates a transmissive liquid crystal panel from behind, or as a lighting device in a room or the like. The light emitting device 1 includes, for example, a plurality of light sources 10 (see FIG. 3A), a wavelength conversion unit 20, an optical sheet 30, and a lens unit 70. The wavelength conversion unit 20 corresponds to a specific example of the “wavelength conversion member” of the present disclosure, the optical sheet 30 corresponds to a specific example of the “light diffusion member” of the present disclosure, and the lens unit 70 corresponds to the present disclosure. This corresponds to a specific example of “light beam control member”. The light emitting device 1 may further include, for example, a reflective substrate 40, a stud 50 (see FIG. 3A), a light reflecting member 60, and the like.

The plurality of light sources 10 are arranged on the reflective substrate 40, for example, in a matrix. For example, as shown in FIG. 3A, the optical sheet 30 is placed on the tops of the plurality of studs 50 erected on the surface 40 </ b> S of the reflective substrate 40. Thereby, the optical sheet 30 is disposed facing the reflective substrate 40 so as to cover the plurality of light sources 10 in common. The front surface 40S and the back surface 30S of the optical sheet 30 are held at a constant distance L4 by a plurality of studs 50 (see FIG. 3A). The wavelength conversion unit 20 is disposed between the light source 10 and the optical sheet 30 in the Z direction. The wavelength conversion unit 20 is arranged so as to occupy regions corresponding to the plurality of light sources 10 in the XY plane. The lens unit 70 is disposed between the light source 10 and the wavelength conversion unit 20 in the Z direction. The lens unit 70 includes a lens unit 71 arranged so as to occupy regions corresponding to the plurality of light sources 10 in the XY plane. Therefore, the light source 10, the wavelength conversion unit 20, and the lens unit 71 are arranged so as to overlap each other in the Z direction.

In this specification, the distance direction connecting the optical sheet 30 and the reflective substrate 40 is the Z direction (front-rear direction), the left-right direction on the main surface (widest surface) of the optical sheet 30 and the reflective substrate 40 is the X direction, and the vertical direction. Is the Y direction.

The light source 10 is a point light source, and specifically includes an LED (Light Emitting Diode). As illustrated in FIG. 3A, the light source 10 faces the back surface 20S2 of the wavelength conversion unit 20, for example.

The wavelength conversion unit 20 is disposed between the light source 10 and the optical sheet 30, and improves the color development characteristics, for example, by converting the wavelength of the light from the light source 10 to emit converted light. The wavelength conversion unit 20 includes an upper portion 21 that covers a region (directly above region) corresponding to each of the light sources 10 and a peripheral region thereof, and a connecting portion 22 that connects the immediately upper portions 21 adjacent to each other in the X direction, for example. , Extending in the X direction as a whole. A plurality of wavelength converters 20 are arranged in the Y direction. For example, the connecting portion 22 is inserted and held in a slit 54 between a pedestal 52 and a presser 53 provided in the middle part of the column portion 51 of the stud 50 (see FIG. 3A). The wavelength conversion unit 20 is further fixed by the connection portion 22 being gripped by the clip portion 74 of the lens unit 70. With such a structure, the distance L1 between the back surface 20S2 of the wavelength converter 20 and the light source 10 is kept constant (see FIG. 3). Note that it is not necessary to hold all of the plurality of connecting portions 22 by the slits 54 and the clip portions 74, and it is sufficient if some of the connecting portions 22 are held.

In the Z direction, the distance L1 between the light source 10 and the wavelength conversion unit 20 is preferably shorter than the distance L3 between the optical sheet 30 and the wavelength conversion unit 20. This is because a more uniform luminance distribution can be obtained as compared with the case where the distance L1 is equal to or greater than the distance L3. That is, when the wavelength conversion unit 20 approaches the optical sheet 30, the contour of the wavelength conversion unit 20 is projected onto the optical sheet 30, and the contour of the wavelength conversion unit 20 may be visually recognized from the outside.

In the present embodiment, an example will be described in which the wavelength conversion unit 20 is provided as an integrated body in which the upper part 21 and the connection part 22 are made of the same material. However, the connecting portion 22 may be formed of a material different from the portion 21 directly above, for example, a resin that does not perform wavelength conversion. Here, the width W22 of the connecting portion 22 is preferably narrower than the width W21 of the immediately upper portion 21 (see FIG. 2A). This is because the amount of material used is reduced, which is advantageous in terms of cost reduction and weight reduction.

The wavelength conversion unit 20 includes a phosphor (fluorescent substance) such as a fluorescent pigment or a fluorescent dye, or a light emitter having a wavelength conversion function such as a quantum dot. The wavelength conversion unit 20 may be one in which a resin containing such a fluorescent material or a light emitter is processed into a sheet shape, or may be printed in a predetermined region on another transparent substrate. Or the thing of the layer of the fluorescent material and the light-emitting body enclosed between two transparent films may be sufficient.

The wavelength conversion unit 20 is excited by light having a first wavelength (hereinafter referred to as first wavelength light) from the light source 10 incident from the back surface 20S2, and performs wavelength conversion based on a principle such as fluorescence emission. What is the first wavelength? Light having a different second wavelength (hereinafter, second wavelength light) is emitted from the surface 20S1. Here, the first wavelength light from the light source 10 passes through the lens unit 71 and then enters the back surface 20S2 of the wavelength conversion unit 20. The first wavelength and the second wavelength are not particularly limited. For example, in the case of a display device, the first wavelength light is blue light (for example, a wavelength of about 440 to 460 nm), and the second wavelength light is red light. (For example, a wavelength of 620 nm to 750 nm) or green light (for example, a wavelength of 495 nm to 570 nm) may be used. That is, the light source 10 is a blue light source. In this case, the wavelength conversion unit 20 converts the wavelength of blue light into red light or green light.

The wavelength conversion unit 20 preferably includes quantum dots. Quantum dots are particles having a major axis of about 1 nm to 100 nm and have discrete energy levels. Since the energy state of the quantum dot depends on its size, the emission wavelength can be freely selected by changing the size. The light emitted from the quantum dots has a narrow spectral width. The color gamut is expanded by combining such steep peak light. Therefore, it is possible to easily expand the color gamut by using quantum dots as the wavelength conversion substance. Furthermore, the quantum dot has high responsiveness, and the light from the light source 10 can be used efficiently. In addition, quantum dots are highly stable. The quantum dot is, for example, a compound of a group 12 element and a group 16 element, a compound of a group 13 element and a group 16 element, or a compound of a group 14 element and a group 16 element, such as CdSe, CdTe, ZnS, CdS. , PdS, PbSe or CdHgTe.

In the XY plane, the center point of the portion 21 immediately above the wavelength conversion unit 20 and the center point of the lens unit 71 are both coincident with the optical axis CL of the light source 10 (see FIG. 3A).

The lens unit 70 includes the lens unit 71 located immediately above the wavelength conversion unit 20 as described above. The lens portion 71 is provided, for example, separated from the surface 40S. However, the lens unit 71 may be directly fixed to the surface 40S. Or the lens part 71 with the light source 10 may be integrally provided on the base 72 on a flat plate like the lens unit 70A as a 1st modification shown in FIG. 3B, for example. In addition to glass, the lens unit 71 is made of, for example, an acrylic resin such as polymethylmethacrylate (PMMA), a transparent resin such as a polycarbonate (PC), a cycloolefin polymer (COP), or an epoxy resin. Can do.

The back surface 20S2 of the wavelength conversion unit 20 and the exit surface 71S2 of the lens unit 71 may be separated from each other with a distance L6 (see FIG. 3A). This is because if the wavelength conversion unit 20 and the lens unit 71 are in contact with each other, heat generated in the light source 10 is not sufficiently released to the outside, and overheating in the light source 10 and its vicinity may occur. The distance L6 may be, for example, one third or more of the distance between the back surface 20S2 and the front surface 40S. This is because the light emitted from the light source 10 is emitted to the outside without being scattered between the wavelength conversion unit 20 and the lens unit 71, so that the light emission efficiency is improved.

The lens unit 71 reduces the luminous intensity of the component near the optical axis toward the vicinity of the optical axis CL of the wavelength conversion unit 20 out of the wavelength light of the first wavelength light from the light source 10, so that the optical axis CL of the wavelength conversion unit 20 The luminous intensity of the peripheral component toward the peripheral part surrounding the vicinity is improved. As a result, the intensity distribution of the first wavelength light that passes through the lens unit 71 and enters the wavelength conversion unit 20 is further flattened.

Specifically, as shown in FIG. 3C, the lens unit 71 is a lens having a negative refractive power in the optical axis vicinity region R71 and a positive refractive power in the peripheral region R72 surrounding the optical axis vicinity region, for example. is there. The exit surface 71S2 of the lens unit 71 is an aspherical surface having a concave shape in the optical axis vicinity region R71 and a convex shape in the peripheral region R72. More specifically, the exit surface 71S2 of the lens unit 71 has, for example, a concave shape in which the negative refractive power decreases as the distance from the optical axis CL increases in the optical axis vicinity region R71, and as the distance from the optical axis CL increases in the peripheral region R72. It may have a convex shape that increases the positive refractive power. On the other hand, the incident surface 71S1 of the lens unit 71 has, for example, a concave shape toward the light source 10 in the optical axis vicinity region R71. Alternatively, the incident surface 71S1 may be a flat surface.

Furthermore, it is desirable that the lens unit 71 satisfies all of the following conditional expressions (1) to (3) at the inflection point FP that is the boundary between the optical axis vicinity region R71 and the peripheral region R72.

θ1> 45 ° (1)
θ2> 45 ° (2)
θ1 = θ2 ° (3)
However, θ1 is an angle formed by a line connecting the light emission center point P1 of the light source 10 from which the first wavelength light LL1 is emitted and the incident point P2 at which the first wavelength light LL is incident on the lens unit 71 with respect to the optical axis CL ( Θ2 is an angle formed by the traveling direction of the emission light LL2 emitted from the emission surface 71S2 of the lens unit 71 with respect to the optical axis CL (hereinafter referred to as an emission angle) (see FIG. 3C). ).

The lens unit 71 may further satisfy the following conditional expression (4).

θ2 ≦ tan ⁻¹ (R1 / L1) (4)
Here, R1 is a radius obtained as an intermediate value between the circumscribed circle radius rr1 and the inscribed circle radius rr2 in the portion 21 immediately above the wavelength conversion unit 20 (see FIG. 3D). L1 is the distance between the light source 10 and the wavelength converter 20 in the Z direction.

The lens unit 70 may further include a connecting portion 73 that connects two or more lens portions 71 (FIGS. 2A, 2B, and 3A). The lens portion 71 and the connecting portion 73 may be an integrated body made of the same material. In that case, the number of parts can be reduced. The connecting portion 73 is fixed to the reflective substrate 40 by screws 75, for example. The connecting portion 22 and the connecting portion 73 both have, for example, portions that extend in the X-axis direction and overlap each other in the thickness direction (Z-axis direction). The connecting portion 73 may be provided with a clip portion 74 that holds the connecting portion 22. In addition, for example, a columnar spacer 76 may stand on the connection portion 73 between the connection portion 22 and the connection portion 73. Since the connecting portion 22 and the connecting portion 73 are maintained at a more uniform interval in the plane, the distance L1 between the upper portion 21 and the light source 10 and the distance L6 between the upper portion 21 and the top surface 71T of the wall portion 71. This is because each is kept homogeneous in the plane. The spacer 76 may constitute an integral part with the connecting portion 73.

The reflective substrate 40 is a plate-like or sheet-like member provided to face the back surface 20S2 of the wavelength conversion unit 20. The reflective substrate 40 is emitted from the light source 10 and reaches the wavelength conversion unit 20 through the lens unit 70 and then returns from the light reflecting member 60, or is emitted from the light source 10 and reaches the optical sheet 30 and then reaches the optical sheet 30. The light returned from 30 is returned toward the wavelength conversion unit 20 or the optical sheet 30. The reflective substrate 40 has functions such as reflection, diffusion, and scattering, for example, so that the light from the light source 10 can be efficiently used and the front luminance can be increased.

The reflective substrate 40 is made of, for example, foamed PET (polyethylene terephthalate), a silver deposited film, a multilayer reflective film, or white PET. When the reflective substrate 40 has a regular reflection (specular reflection) function, the surface of the reflective substrate 40 is preferably subjected to a treatment such as silver vapor deposition, aluminum vapor deposition, or multilayer film reflection. When a fine shape is imparted to the reflective substrate 40, the reflective substrate 40 may be integrally formed by a technique such as hot press molding using a thermoplastic resin, or melt extrusion molding, or, for example, PET It may be formed by applying an energy ray (for example, ultraviolet ray) curable resin on a substrate made of, for example, and then transferring the shape to the energy ray curable resin. Here, examples of the thermoplastic resin include polycarbonate resins, acrylic resins such as PMMA (polymethyl methacrylate resin), polyester resins such as polyethylene terephthalate, and amorphous copolymers such as MS (copolymer of methyl methacrylate and styrene). Examples thereof include a polymerized polyester resin, a polystyrene resin, and a polyvinyl chloride resin. Further, when the shape is transferred to an energy ray (for example, ultraviolet ray) curable resin, the substrate may be glass.

In the light emitting device 1, for example, four wall portions 41 may be further provided so as to stand on the outer edge of the reflective substrate 40 and surround the plurality of light sources 10 and the wavelength conversion unit 20 from four directions. The inner surface of the wall portion 41 has a reflection function, and an auxiliary wavelength conversion portion 42 is provided in a part thereof. The wavelength converter 42 is a band-shaped member made of, for example, the same material as the wavelength converter 20 and formed on the inner surface of the wall 41 and extending in the X direction and the Y direction. The wavelength conversion unit 42 has a wavelength conversion function similar to the wavelength conversion unit 20, and supplements the function of the main wavelength conversion unit 20.

The optical sheet 30 is provided so as to face the surface 20S1 of the wavelength conversion unit 20, and includes, for example, a diffusion plate, a diffusion sheet, a lens film, a polarization separation sheet, and the like. 1 and 3A, only one of the plurality of optical sheets 30 is shown. By providing such an optical sheet 30, it is possible to raise the light emitted obliquely from the light source 10 or the wavelength conversion unit 20 in the front direction, and to further increase the front luminance.

The light emitting device 1 further includes a light reflecting member 60 that reflects the light transmitted through the portion 21 immediately above the wavelength conversion unit 20. The light reflecting member 60 is disposed in a region corresponding to each of the plurality of light sources 10 in the XY plane. In the present embodiment, the case where the light reflecting member 60 is disposed so as to be in contact with the surface 20S1 is illustrated. However, if the light reflecting member 60 is disposed between the immediately upper portion 21 and the optical sheet 30, the surface 20S1 is illustrated. And may be separated from each other. Furthermore, the center point of the light reflecting member 60 may coincide with the optical axis CL of the light source 10 in the XY plane (see FIG. 3A).

[Operation and Effect of Light-Emitting Device 1]
Since the light source 10 is a point light source, the light emitted from the light source 10 spreads in all directions of 360 ° from the light emission center of the light source 10, and finally passes through the optical sheet 30 and is observed as light emission. Here, in the light emitting device 1 of the present embodiment, the portion 21 directly above the plurality of wavelength conversion units 20 is disposed between the light source 10 and the optical sheet 30 in the Z direction and the plurality of light sources 10 in the XY plane. Each was arranged in a corresponding area. Thereby, the wavelength conversion to the light of the second wavelength (for example, green light or red light) is performed while reducing the intensity of the light of the first wavelength (for example, blue light) that is directly incident on the optical sheet 30 from the light source 10. Can be done appropriately. In addition, the amount of the constituent material used can be reduced as compared with the case where one sheet-like wavelength conversion member is provided over the entire surface. Therefore, according to the light emitting device 1, it is possible to efficiently emit light with less luminance unevenness and color deviation in the XY plane while reducing the weight.

In the light emitting device 1, the lens unit 71 is further provided between the light source 10 and the portion 21 directly above the wavelength conversion unit 20 corresponding thereto. Thereby, most of the light having the first wavelength emitted from the light source 10 can be incident on the portion 21 immediately above. Therefore, the intensity of the first wavelength light that is emitted from the light source 10 and directly incident on the optical sheet 30 can be further reduced, and the wavelength from the first wavelength light to the second wavelength light is further reduced. Conversion can be performed more efficiently. Moreover, when the lens unit 71 has an appropriate shape, the intensity distribution of the first wavelength light incident on the portion 21 immediately above the wavelength conversion unit 20 is further flattened. Therefore, by using the lens portion 71, the illuminance peak value of the first wavelength light incident on the directly upper portion 21 and the temperature peak value of the heated directly upper portion 21 can be greatly reduced. Long life can be expected. In addition, since the intensity distribution of the first wavelength light incident on the immediately upper portion 21 is further flattened, it is possible to more efficiently emit light with less luminance unevenness and color deviation in the XY plane. In the light emitting device 1, for example, the exit surface 71S2 of the lens unit 71 has a concave shape in which the negative refractive power decreases as the distance from the optical axis CL increases in the optical axis vicinity region R71, and increases as the distance from the optical axis CL increases in the peripheral region R72. In the case of having a convex shape that increases the refractive power of the first wavelength light, the first wavelength light having an extremely flattened intensity distribution can be incident on the portion 21 immediately above the wavelength conversion unit 20.

Further, since the light reflecting member 60 is provided on the portion 21 immediately above the wavelength conversion unit 20, the flatness of the emission intensity from the optical sheet 30 is improved. This is because the light transmitted from the light source 10 directly through the upper portion 21 is not incident on the optical sheet 30 as it is, but is reflected by the light reflecting member 60, reflected again by the reflective substrate 40, and then guided to the optical sheet 30. It is.

Thus, according to the light emitting device 1, light having higher uniformity in the plane can be emitted. That is, light with less luminance unevenness and color deviation can be efficiently emitted in the plane. For this reason, if this light-emitting device 1 is used for a display apparatus, the display performance excellent in color reproducibility etc. can be exhibited. Moreover, if this light-emitting device 1 is used for an illuminating device, more homogeneous illumination can be performed on an object.

<Modification of the first embodiment>
In the first embodiment, the connecting portion 73 in the lens unit 70 is fixed to the reflective substrate 40 with the screw 75. However, the fixing means is not limited to the screw 75. For example, as in the second modification shown in the perspective view of FIG. 4A and the cross-sectional view of FIG. 4B, the projection 77 is provided in the connecting portion 73 and the projection 77 is provided in the surface 40S of the reflective substrate 40. You may make it insert and fix to 40H. In that case, the protrusion 77 may be provided with a claw 77 </ b> A so as to be locked to the locking portion 40 </ b> HK inside the hole 40 </ b> H provided in the reflective substrate 40. In this case, the wall portion 71, the connecting portion 73, the clip portion 74, the protrusion 77, and the like may be integrated. Further, as shown in FIG. 11L, the connecting portion 73 may be curved so that the lower surface 73LS is concave. By curving in this way, it is possible to prevent the wall portion 71 provided at the end portion of the connecting portion 73 from separating from the surface 40S when the protruding portion 77 is inserted and fixed in the hole 40H.

<Second Embodiment>
FIG. 5 illustrates an appearance of the display device 101 according to the second embodiment of the present technology. The display device 101 includes the light emitting device 1 and is used as, for example, a thin television device, and has a configuration in which a flat main body 102 for image display is supported by a stand 103. The display device 101 is used as a stationary type with the stand 103 attached to the main body 102 and placed on a horizontal surface such as a floor, a shelf, or a stand, but the stand 103 is removed from the main body 102. It can also be used as a wall-hanging type.

FIG. 6A is an exploded view of the main body 102 shown in FIG. 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 peripheral edge of the front surface of the panel module 112, and a pair of speakers 114 are disposed below the front exterior member 111. The panel module 112 is fixed to the front exterior member 111, and a power supply board 115 and a signal board 116 are mounted on the rear surface thereof, and a mounting bracket 117 is fixed. The mounting bracket 117 is for mounting a wall-mounted bracket, mounting a board, etc., and mounting the stand 103. The rear exterior member 113 covers the back and side surfaces of the panel module 112.

FIG. 6B is an exploded view of the panel module 112 shown in FIG. 6A. The panel module 112 includes, for example, from the front side (viewer side), a front housing (top chassis) 121, a liquid crystal panel 122, a frame-shaped member (middle chassis) 80, an optical sheet 30, a wavelength conversion unit 20, and a reflective substrate. 40, a rear case (back chassis) 124 and a timing controller board 127 are provided in this order.

The front housing 121 is a frame-shaped metal part that covers the front peripheral edge of the liquid crystal panel 122. The liquid crystal panel 122 includes, for example, a liquid crystal cell 122A, a source substrate 122B, and a flexible substrate 122C such as a COF (Chip On On Film) that connects them. The frame-shaped 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 part made of iron (Fe) or the like that houses the liquid crystal panel 122, the intermediate housing 123, and the light emitting device 1. The timing controller board 127 is also mounted on the back surface of the rear housing 124.

In the display device 101, the light from the light emitting device 1 is selectively transmitted through the liquid crystal panel 122, thereby displaying an image. 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.

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. However, the display device 101 is replaced with the light emitting device 1 in the second embodiment. You may provide the light-emitting device 2 which concerns on a form.

<Application example of display device>
Hereinafter, application examples of the display device 101 as described above to an electronic device will be described. Examples of the electronic device include a television device, a digital camera, a notebook personal computer, a mobile terminal device such as a mobile phone, or a video camera. In other words, the display device can be applied to electronic devices in various fields that display a video signal input from the outside or a video signal generated inside as an image or video.

[Application Example 1]
FIG. 7A shows the appearance of an electronic book to which the display device 101 of the above embodiment is applied. FIG. 7B shows the appearance of another electronic book to which the display device 101 of the above embodiment is applied. Each of these electronic books has, for example, a display unit 210 and a non-display unit 220, and the display unit 210 is configured by the display device 101 of the above embodiment.

[Application Example 2]
FIG. 8 illustrates an appearance of a smartphone to which the display device 101 of the above embodiment is applied. This smartphone has, for example, a display unit 230 and a non-display unit 240, and the display unit 230 is configured by the display device 101 of the above embodiment.

[Application Example 3]
9A and 9B show the appearance of a digital camera to which the display device 101 of the above embodiment is applied. FIG. 9A shows an appearance of the digital camera viewed from the front (object side), and FIG. 9B shows an appearance of the digital camera viewed from the rear (image side). The digital camera includes, for example, a flash light emitting unit 410, a display unit 420, a menu switch 430, and a shutter button 440, and the display unit 420 is configured by the display device 101 of the above embodiment.

[Application Example 4]
FIG. 10 illustrates an appearance of a notebook personal computer to which the display device 101 according to the above embodiment is applied. The notebook personal computer has, for example, a main body 510, a keyboard 520 for inputting characters and the like, and a display unit 530 for displaying an image. The display unit 530 is provided by the display device 101 of the above embodiment. It is configured.

[Application Example 5]
FIG. 11 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 610, a subject photographing lens 620 provided on the front side surface of the main body 610, a start / stop switch 630 at the time of photographing, and a display 640. And this display part 640 is comprised by the display apparatus 101 of the said embodiment.

[Application Example 6]
12A and 12B show the appearance of a mobile phone to which the display device 101 of the above embodiment is applied. For example, the mobile phone is obtained by connecting an upper housing 710 and a lower housing 720 with a connecting portion (hinge portion) 730, and includes a display 740, a sub-display 750, a picture light 760, and a camera 770. Yes. Of these, the display 740 or the sub-display 750 is configured by the display device 101 of the above embodiment.

<Application example of lighting device>
13 and 14 show the appearance of a tabletop lighting device to which the light-emitting

devices

1 and 2 according to the above-described embodiments are applied. This illuminating device is, for example, one in which an illuminating unit 843 is attached to a support column 842 provided on a base 841, and the illuminating unit 843 includes the

light emitting devices

1 and 2 according to the first and second embodiments. It is comprised by either of 2. The illumination unit 843 can have an arbitrary shape such as a cylindrical shape shown in FIG. 13 or a curved shape shown in FIG. 14 by making the optical sheet 30 or the reflective substrate 40 into a curved shape.

FIG. 15 shows the appearance of an indoor lighting device to which the

light emitting devices

1 and 2 of the above embodiment are applied. This illuminating device has the illumination part 844 comprised by either the light-emitting

devices

1 and 2 which concern on the said embodiment, for example. The illumination units 844 are arranged at an appropriate number and interval on the ceiling 850A of the building. Note that the lighting unit 844 can be installed not only in the ceiling 850A but also in an arbitrary place such as a wall 850B or a floor (not shown) depending on the application.

In these illumination devices, illumination is performed by light from the light emitting device 1. Here, as described in the first embodiment, since the

light emitting devices

1 and 2 having improved in-plane color uniformity are provided, the illumination quality is improved.

<Experimental example>
(Experimental example 1)
A sample of the light emitting device 1 according to the first embodiment was manufactured. However, the planar shape of the portion 21 directly above the wavelength converter 20 and the light reflecting member 60 is a circle as shown in FIG. 16A, for example. As shown in FIG. 16A, the width of the immediately upper portion 21 was 24.0 mm, and the width of the light reflecting member 60 was 18.4 mm. Further, the lens portion 71A having the cross-sectional shape shown in FIG. 17A was used. The lens portion 71A was manufactured using PMMA. As shown in FIG. 17A, in the lens portion 71A, the maximum outer diameter was 9.06 mm, and the maximum outer diameter of the incident surface 71S1 was 7.18 mm. The distance from the surface 40S to the inflection point FP of the exit surface 71S2 is 2.97 mm, the distance from the surface 40S to the position of the exit surface 71S2 on the optical axis CL is 2.4 mm, and the surface 40S to the optical axis CL The distance to the position of the incident surface 71S1 was 1.6 mm, and the minimum distance between the lens portion 71A and the surface 40S was 0.5 mm. Furthermore, the distance L4 between the portion 21 directly above the wavelength conversion unit 20 and the surface 40S was set to 5.0 mm. In the sample of Experimental Example 1, as shown in FIG. 18A, all the first wavelength light from the light source 10 is incident on the overlapping region between the upper portion 21 and the light reflecting member 60. 18A is a cross-sectional view in the direction of the arrow along the line II shown in FIG. 16A.

(Experimental example 2)
Similar to Experimental Example 1, a sample of the light emitting device 1 according to the first embodiment was manufactured. However, as shown in FIG. 16B, the width of the directly upper portion 21 was 30.6 mm, and the width of the light reflecting member 60 was 21.0 mm. Moreover, the lens part 71B which has the cross-sectional shape shown to FIG. 17B was used. The lens portion 71B was manufactured using PMMA. As shown in FIG. 17B, in the lens portion 71B, the maximum outer diameter was 9.08 mm, and the maximum outer diameter of the incident surface 71S1 was 7.18 mm. The distance from the surface 40S to the inflection point FP of the exit surface 71S2 is 2.87 mm, the distance from the surface 40S to the position of the exit surface 71S2 on the optical axis CL is 2.4 mm, and the distance from the surface 40S to the optical axis CL. The distance to the position of the incident surface 71S1 was 1.6 mm, and the minimum distance between the lens portion 71B and the surface 40S was 0.5 mm. Furthermore, the distance L4 between the portion 21 directly above the wavelength conversion unit 20 and the surface 40S was set to 7.0 mm. In the sample of Experimental Example 1, as shown in FIG. 18B, most of the first wavelength light from the light source 10 was incident on the portion 21 immediately above. However, a part of the ambient light is incident on a region outside the region overlapping with the light reflecting member 60 in the upper portion 21. 18B is a cross-sectional view in the direction of the arrow along the line II-II shown in FIG. 16B.

(Reference example)
Except that the lens unit 70 (lens portion 71) was not provided, a sample of the light emitting device 1 having the same configuration as that of Experimental Example 1 was manufactured (see FIG. 16C). In this reference example, as shown in FIG. 18C, most of the first wavelength light from the light source 10 is incident on the directly upper portion 21, but a part of the ambient light deviates from the directly upper portion 21 to the outside. did. 18C is a cross-sectional view in the direction of the arrow along the line III-III shown in FIG. 16C.

The illuminance distribution observed in an area immediately above an arbitrary light source 10 in which only one lamp was turned on was measured for each of the samples of the experimental examples 1 and 2 and the reference example. The results are shown in FIGS. 19A to 19C and FIG. 20, respectively. 19A to 19C, the horizontal axis represents a position (arbitrary unit) centered on the center position (optical axis position) of the light source 10 in the X-axis direction, and the vertical axis represents the center position (light) of the light source 10 in the X-axis direction. This represents the position (arbitrary unit) centered on the axis position. FIG. 20 is a comparison of the illuminance distribution according to the position in the X-axis direction for Experimental Examples 1 and 2 and the Reference Example, where the illuminance at the center position of the light source 10 in the Reference Example is 1.

From the results shown in FIGS. 19A to 19C and FIG. 20, according to the light emitting device 1 of the present disclosure, the first wavelength light that has been flattened from the vicinity of the optical axis of the directly upper portion 21 to the periphery is supplied to the directly upper portion 21. It was confirmed that the light can be incident on.

(Experimental example 3)
Similar to Experimental Example 1, a sample of the light emitting device 1 according to the first embodiment was manufactured. However, the lens portion 71C having the cross-sectional shape shown in FIG. 21A was used. As shown in FIG. 21A, in the lens portion 71C, the maximum outer diameter was 6.54 mm, and the maximum outer diameter of the incident surface 71S1 was 3.7 mm. The distance from the surface 40S to the inflection point FP of the exit surface 71S2 is 2.81 mm, the distance from the surface 40S to the position of the exit surface 71S2 on the optical axis CL is 2.4 mm, and the distance from the surface 40S to the optical axis CL. The distance to the position of the incident surface 71S1 was 1.6 mm, and the minimum distance between the lens portion 71C and the surface 40S was 0.52 mm. Furthermore, the distance L4 between the portion 21 directly above the wavelength conversion unit 20 and the surface 40S was 5 mm. In the sample of Experimental Example 3, as shown in FIG. 21B, all of the first wavelength light from the light source 10 is incident on the overlapping region between the upper portion 21 and the light reflecting member 60. Also in this experimental example 3, when the illuminance distribution observed in the region immediately above the arbitrary light source 10 in which only one lamp was turned on was measured in the same manner as in the experimental examples 1 and 2, from the vicinity of the optical axis of the directly above portion 21 It has been confirmed that the flattened first wavelength light can be incident on the upper portion 21 up to the periphery.

Furthermore, the relationship between the incident angle θ1 and the emission angle θ2 was investigated for the lens portions 71A to 71C used in the samples of the above experimental examples 1 to 3. The result is shown in FIG. As shown in FIG. 22, it can be confirmed that each of the lens portions 71A to 71C used in Experimental Examples 1 to 3 has an inflection point FP that satisfies all the conditional expressions (1) to (3). It was. That is, it was found that the incident angle θ1 and the emission angle θ2 are equal to each other at a value larger than 45 °. Specifically, as the incident angle θ1 increases from 0, the emission angle θ2 increases while maintaining the relationship (θ2> θ1). Accordingly, it was found that the first wavelength light diverges due to the optical action (refractive power) of the lens portions 71A to 71C in the region where the angle incident on the optical axis vicinity region R71 of the lens portions 71A to 71C is small. Further, after passing through the inflection point FP where θ1 = θ2, when the incident angle θ1 further increases, the emission angle θ2 decreases while maintaining the relationship (θ2 <θ1). Therefore, it was found that the first wavelength light converges due to the optical action (refractive power) of the lens portions 71A to 71C in a region where the angle incident on the peripheral region R72 of the lens portions 71A to 71C is small. Furthermore, as shown in FIG. 22, the lens portions 71A to 71C used in Experimental Examples 1 to 3 all satisfied the above-described conditional expression (4). From these results, by using the lens portion 71 having a shape that satisfies all of the conditional expressions (1) to (4), the first wavelength that has been flattened further from the vicinity of the optical axis of the immediately above portion 21 to the periphery. It was confirmed that light can be incident on the upper portion 21.

Further, the first wavelength portion 21 of the first wavelength light emitted from the light source 10 in each of the samples of the experimental examples 1 and 2 and the reference example (in the experimental examples 1 and 2 and further transmitted through the lens unit 71 after that). The illuminance peak value at the position where is placed was measured with a spectral illuminometer. Moreover, the temperature peak value (° C.) of the portion 21 directly irradiated with the first wavelength light in the same sample was measured using a thermocouple thermometer. The results are summarized in Table 1. In Table 1, the illuminance peak value is a numerical value normalized based on the numerical value in the reference example. Moreover, in Table 1, about the temperature peak value, the numerical value of the difference (degreeC) is shown on the basis of the numerical value in a reference example.

As shown in Table 1, in the experimental examples 1 and 2, the illuminance peak value could be reduced as compared with the reference example having no lens portion 71. Also, the temperature peak value (° C.) could be lowered by using the lens unit 71 in Experimental Examples 1 and 2. From these results, by using the lens unit 71, both the illuminance peak value of the first wavelength light irradiated on the immediately upper portion 21 and the temperature peak value of the immediately above portion 21 heated thereby are greatly reduced. As a result, it was confirmed that the life of the directly upper portion 21 can be expected.

Although the present disclosure has been described with the embodiment, the modification, and the experimental example, the present disclosure is not limited to the above-described embodiment and the like, and various modifications can be made. For example, the material and thickness of each member described in the above embodiment and the like are not limited, and other materials and thicknesses may be used. Further, the shape of the lens portion is not limited to that of the experimental example described above, and for example, the shape shown in FIG. 23A is also preferably used. FIG. 23A shows a cross section of a lens portion 71D as a third modification. FIG. 23B shows an optical path when this lens unit 71D is used.

In the above-described embodiment and the like, the lens unit 71 is exemplified as the light beam control member, but the present technology is not limited to this. For example, the semi-transmissive member 80 shown in FIGS. 24A and 24B may be used as the light beam control member. The semi-transmissive member 80 includes a disc 81 provided with a plurality of through holes 81K and a support portion 82 that stands on the reflective substrate 40 and supports the disc 81. The circular plate 81 is a white light-shielding portion having a high reflectance, and the first wavelength light from the light source 10 is transmitted through the through hole 81K. The through hole 81K has a smaller diameter as it approaches the light emitting point (center position) of the light source 10. For this reason, the illuminance of the first wavelength light that passes through the vicinity of the center of the disk 81 is low, and the illuminance of the first wavelength light that is transmitted increases toward the periphery of the disk 81. The support portion 82 can cut the first wavelength light incident on the wavelength conversion member without passing through the semi-transmissive member 80. Alternatively, the disc 81 may be formed of a transparent material in the semi-transmissive member 80, and a light-shielding portion made of a high reflectance material may be formed by printing or the like instead of the through hole 81K.

For example, although the case where the light source 10 is an LED has been described in the above embodiment, the light source 10 may be configured by a semiconductor laser or the like.

In addition, the planar shape of the portion 21 directly above the wavelength conversion unit 20 and the light reflecting member 60 is circular, but the present technology is not limited to this, and is, for example, a polygon such as a quadrangle, hexagon, or octagon, or an ellipse. It may be a shape. In that case, the planar shapes of all the directly upper portions 21 and the light reflecting members 60 may be the same shape, or may be some different shapes.

Furthermore, for example, the configuration of the light emitting device 1 and the display device 101 (television device) has been specifically described in the above embodiment, but it is not necessary to include all the components, and other components are not included. You may have.

In addition, the effect described in this specification is an illustration to the last, and is not limited to the description, There may exist another effect. Moreover, this technique can take the following structures.
(1)
A plurality of light sources arranged on the substrate and emitting a first wavelength light;
A light diffusing member covering the plurality of light sources;
It is arranged between the light source and the light diffusing member in the thickness direction, and is arranged in a region corresponding to each of the plurality of light sources in a plane, and the first wavelength light from the light source is converted to a second wavelength. A plurality of wavelength conversion members that convert light;
And a plurality of light beam control members disposed between the plurality of light sources and the plurality of wavelength conversion members, respectively, for controlling a traveling direction of the first wavelength light.
(2)
A light reflecting member that is disposed between the wavelength converting member and the light diffusing member and is disposed in a region corresponding to each of the plurality of light sources in a plane, and reflects light transmitted through the wavelength converting member; The light emitting device according to (1) above.
(3)
The light beam control member is
Of the first wavelength light, the luminous intensity of the component near the optical axis toward the vicinity of the optical axis of the wavelength conversion member is decreased, and the luminous intensity of the peripheral component toward the peripheral part surrounding the vicinity of the optical axis of the wavelength conversion member is improved. The light-emitting device according to (1) or (2).
(4)
The light beam control member is a lens having a negative refractive power in a region near the optical axis and a positive refractive power in a peripheral region surrounding the region near the optical axis. Any one of (1) to (3) The light-emitting device as described in one.
(5)
The lens includes an exit surface including an aspheric surface having a concave shape toward the wavelength conversion member in the region near the optical axis and having a convex shape toward the wavelength conversion member in the peripheral region. The light-emitting device of description.
(6)
The lens is
In the vicinity of the optical axis, a concave shape in which the negative refractive power decreases as the distance from the optical axis decreases, and in the peripheral area includes an exit surface having a convex shape in which the positive refractive power increases as the distance from the optical axis increases. The light emitting device according to 4) or (5).
(7)
The light emitting device according to any one of (4) to (6), wherein the lens includes an incident surface having a concave shape toward the light source in a region near the optical axis.
(8)
The lens satisfies all of the following conditional expressions (1) to (3) at an inflection point that is a boundary between the optical axis vicinity region and the peripheral region: Any one of the above (4) to (7) The light-emitting device of description.
θ1> 45 ° (1)
θ2> 45 ° (2)
θ1 = θ2 ° (3)
However,
θ1: An angle formed by a line connecting a light emission center point at which the first wavelength light is emitted from the light source and an incident point at which the first wavelength light is incident on the lens with respect to the optical axis θ2: emitted from the exit surface of the lens The angle formed by the traveling direction of the emitted light with respect to the optical axis.
(9)
The light emitting device according to (8), wherein the lens satisfies the following conditional expression (4).
θ2 ≦ tan ⁻¹ (R1 / L1) (4)
However,
R1: An intermediate value L1: between the circumscribed circle radius and the inscribed circle radius in the wavelength conversion member, and the distance in the thickness direction between the light source and the wavelength conversion member.
(10)
The light emitting device according to any one of (1) to (9), further including a first connecting member that connects the two or more light beam control members.
(11)
A second connecting member that connects the two or more wavelength conversion members;
The light emitting device according to (10), wherein the first connecting member is provided with a clip portion that holds the second connecting member.
(12)
The light emitting device according to any one of (1) to (11), wherein the light beam control member and the light source are integrated.
(13)
The light emitting device according to any one of (1) to (12), wherein the wavelength conversion member and the light beam control member are separated from each other.
(14)
The light emitting device according to any one of (1) to (13), wherein the wavelength conversion member includes quantum dots.
(15)
A liquid crystal panel, and a light emitting device on the back side of the liquid crystal panel,
The light emitting device
A plurality of light sources arranged on the substrate and emitting a first wavelength light;
A light diffusing member covering the plurality of light sources;
It is arranged between the light source and the light diffusing member in the thickness direction, and is arranged in a region corresponding to each of the plurality of light sources in a plane, and the first wavelength light from the light source is converted to a second wavelength. A plurality of wavelength conversion members that convert light;
A display device comprising: a plurality of light beam control members disposed between the plurality of light sources and the plurality of wavelength conversion members, respectively, for controlling a traveling direction of the first wavelength light.
(16)
With a light emitting device,
The light emitting device
A plurality of light sources arranged on the substrate and emitting a first wavelength light;
A light diffusing member covering the plurality of light sources;
It is arranged between the light source and the light diffusing member in the thickness direction, and is arranged in a region corresponding to each of the plurality of light sources in a plane, and the first wavelength light from the light source is converted to a second wavelength. A plurality of wavelength conversion members that convert light;
An illumination device, comprising: a plurality of light beam control members that are disposed between the plurality of light sources and the plurality of wavelength conversion members, respectively, and control a traveling direction of the first wavelength light.

This application claims priority on the basis of Japanese Patent Application No. 2015-759 filed on January 6, 2015 at the Japan Patent Office. The entire contents of this application are hereby incorporated by reference. Incorporated into.

Those skilled in the art will envision various modifications, combinations, subcombinations, and changes, depending on design requirements and other factors, which are within the scope of the appended claims and their equivalents. It is understood that

Claims

A plurality of light sources arranged on the substrate and emitting a first wavelength light;
A light diffusing member covering the plurality of light sources;
It is arranged between the light source and the light diffusing member in the thickness direction, and is arranged in a region corresponding to each of the plurality of light sources in a plane, and the first wavelength light from the light source is converted to a second wavelength. A plurality of wavelength conversion members that convert light;
And a plurality of light beam control members disposed between the plurality of light sources and the plurality of wavelength conversion members, respectively, for controlling a traveling direction of the first wavelength light.
A light reflecting member that is disposed between the wavelength converting member and the light diffusing member and is disposed in a region corresponding to each of the plurality of light sources in a plane, and reflects light transmitted through the wavelength converting member; The light emitting device according to claim 1.
The light beam control member is
Of the first wavelength light, the luminous intensity of the component near the optical axis toward the vicinity of the optical axis of the wavelength conversion member is decreased, and the luminous intensity of the peripheral component toward the peripheral part surrounding the vicinity of the optical axis of the wavelength conversion member is improved. The light-emitting device according to claim 1.
The light-emitting device according to claim 1, wherein the light beam control member is a lens having a negative refractive power in a region near the optical axis and a positive refractive power in a peripheral region surrounding the region near the optical axis.
5. The lens according to claim 4, wherein the lens includes an exit surface formed of an aspheric surface having a concave shape toward the wavelength conversion member in the region near the optical axis and a convex shape toward the wavelength conversion member in the peripheral region. Light emitting device.
The lens is
An exit surface having a concave shape in which the negative refractive power decreases as the distance from the optical axis in the region near the optical axis decreases, and a convex shape in which the positive refractive power increases in the peripheral region as it moves away from the optical axis. 4. The light emitting device according to 4.
The light emitting device according to claim 4, wherein the lens includes an incident surface having a concave shape toward the light source in a region near the optical axis.
The light-emitting device according to claim 4, wherein the lens satisfies all of the following conditional expressions (1) to (3) at an inflection point that is a boundary between the optical axis vicinity region and the peripheral region.
θ1> 45 ° (1)
θ2> 45 ° (2)
θ1 = θ2 ° (3)
However,
θ1: An angle formed by a line connecting a light emission center point at which the first wavelength light is emitted from the light source and an incident point at which the first wavelength light is incident on the lens with respect to the optical axis θ2: emitted from the exit surface of the lens The angle formed by the traveling direction of the emitted light with respect to the optical axis.
The light-emitting device according to claim 8, wherein the lens satisfies the following conditional expression (4).
θ2 ≦ tan −1 (R1 / L1) (4)
However,
R1: An intermediate value L1: between the circumscribed circle radius and the inscribed circle radius in the wavelength conversion member, and the distance in the thickness direction between the light source and the wavelength conversion member.
The light emitting device according to claim 1, further comprising a first connecting member that connects two or more of the light beam control members.
A second connecting member that connects the two or more wavelength conversion members;
The light emitting device according to claim 10, wherein the first connecting member is provided with a clip portion that holds the second connecting member.
The light-emitting device according to claim 1, wherein the light beam control member and the light source are integrated.
The light emitting device according to claim 1, wherein the wavelength conversion member and the light beam control member are separated from each other.
The light emitting device according to claim 1, wherein the wavelength conversion member includes quantum dots.
A liquid crystal panel, and a light emitting device on the back side of the liquid crystal panel,
The light emitting device
A plurality of light sources arranged on the substrate and emitting a first wavelength light;
A light diffusing member covering the plurality of light sources;
It is arranged between the light source and the light diffusing member in the thickness direction, and is arranged in a region corresponding to each of the plurality of light sources in a plane, and the first wavelength light from the light source is converted to a second wavelength. A plurality of wavelength conversion members that convert light;
A display device comprising: a plurality of light beam control members disposed between the plurality of light sources and the plurality of wavelength conversion members, respectively, for controlling a traveling direction of the first wavelength light.
With a light emitting device,
The light emitting device
A plurality of light sources arranged on the substrate and emitting a first wavelength light;
A light diffusing member covering the plurality of light sources;
It is arranged between the light source and the light diffusing member in the thickness direction, and is arranged in a region corresponding to each of the plurality of light sources in a plane, and the first wavelength light from the light source is converted to a second wavelength. A plurality of wavelength conversion members that convert light;
An illumination device, comprising: a plurality of light beam control members that are disposed between the plurality of light sources and the plurality of wavelength conversion members, respectively, and control a traveling direction of the first wavelength light.