JP7257478B2 - Display device and light emitting device - Google Patents

Description

The present technology relates to a display device and a light-emitting device suitable for a surface light source.

BACKGROUND ART Surface emitting devices using blue LEDs (Light Emitting Diodes) are employed in backlights of liquid crystal display devices, lighting devices, and the like. For example, in Patent Document 1, a film coated with a fluorescent substance is provided on the light emission observation surface (light emission surface) of a light guide plate, and the wavelength of light incident on the light guide plate from a blue LED is converted by the fluorescent substance to obtain white light. is described. Further, Patent Document 2 describes that a wavelength converter made of an elastic material mixed with a fluorescent substance is provided between a blue LED and an end surface (light incident surface) of a light guide plate.

Patent No. 3116727 Patent No. 3114805

In a light-emitting device used as a surface light source, it is generally strongly desired to improve the uniformity of color (chromaticity) within the surface.

The present technology has been made in view of such problems, and an object thereof is to provide a display device and a light-emitting device with improved in-plane color uniformity.

A display device according to one embodiment of the present disclosure is a display device including a display panel and a light-emitting device arranged on the back side of the display panel, and each light-emitting device has a light source and a wavelength conversion member. , the wavelength converting member converts the wavelength of light emitted from the light source, the wavelength converting member has a wavelength converting material including quantum dots, the quantum dots having an axis of 1 nm to 100 nm; and an optical component having a plurality of light-emitting portions and a light-incident surface facing the plurality of light-emitting portions, the optical component facing the back surface of the display panel and facing the light-incident surface. An optical component having a light emitting surface that is vertical, the light emitting surface having an uneven pattern, and a prevention structure for suppressing light from entering an adjacent light emitting unit from a first light emitting unit, the structure comprising a plurality of concave portions. with each recess configured in association with a corresponding end of a corresponding one of the plurality of light emitting portions.

A display device according to another aspect of the present disclosure is a display device including a display panel and a light-emitting device arranged on the back side of the display panel, wherein the light-emitting device is a light source and a wavelength conversion member, and the wavelength The conversion member converts the wavelength of light emitted from the light source, the wavelength conversion member has a wavelength conversion material including quantum dots, the quantum dots have axes of 1 nanometer to 100 nanometers and convert the light a light source and a wavelength conversion member in a resin arranged to receive the light source; an optical component having a light incident surface facing the light source, the optical component having a light output surface facing the back of the display panel; and a blocking structure having one or more recesses, positioned against the first light source and associated first wavelength converting member, adjacent the converting member for light from the first light source and a prevention structure that inhibits absorption by the region.

A light-emitting device according to still another aspect of the present disclosure is a plurality of light-emitting units each having a light source and a wavelength conversion member, each light source configured to emit light in a first wavelength range, The wavelength converting member has a wavelength converting material and is configured to convert emitted light in a first wavelength range, the wavelength converting material having an axis from 1 nanometer to 100 nanometers and adapted to receive the light. a light guide component having a light incident surface facing the plurality of light emitting units, the light guide component suppressing emitted light in a first wavelength range from entering the light guide component; a prevention structure configured to: the prevention structure has a wavelength converting portion disposed between at least a pair of adjacent wavelength converting members, the wavelength converting members being each of the adjacent wavelength converting members; and the blocking structure has a plurality of circular recesses, each recess configured in association with a corresponding end of a corresponding one of the adjacent wavelength converting members. be.

In the display device and the light-emitting device of the present disclosure, the prevention structure reduces the amount of light generated by the light source that enters the optical component without passing through the wavelength conversion member. That is, the light from the light source is wavelength-converted by the wavelength conversion member and reaches the light incident surface of the optical component.

According to the display device and the light-emitting device of the present disclosure, since the prevention structure is provided, it is possible to prevent the color of the light from the light source from appearing more strongly than the color of the light that has passed through the wavelength conversion member in the plane. be able to. Therefore, it is possible to prevent color unevenness and improve in-plane color uniformity.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view showing the whole structure of the light-emitting device which concerns on 1st Embodiment of this technique. FIG. 2 is a diagram showing a bundle of rays from the light source shown in FIG. 1 toward the light incident surface of the light guide plate; FIG. 2 is a cross-sectional view for explaining the configuration of a light emitting unit shown in FIG. 1; It is a figure showing the structure of the light-emitting device which concerns on a comparative example. 5 is a plan view showing light observed from the light emitting device shown in FIG. 4; FIG. FIG. 11 is a plan view showing the configuration of a light emitting unit according to Modification 1; FIG. 7 is a cross-sectional view showing an example of a configuration between the end portion of the container and the holder shown in FIG. 6; FIG. 11 is a cross-sectional view showing the configuration of a light emitting unit according to Modification 2; It is a sectional view showing the composition of the light-emitting part concerning a 2nd embodiment of this art. FIG. 11 is a cross-sectional view showing the configuration of a light emitting unit according to Modification 3; It is a sectional view showing the composition of the light-emitting part concerning a 3rd embodiment of this art. 2 is a perspective view showing an example of the appearance of a display device to which the light-emitting device shown in FIG. 1 and the like is applied; FIG. 13 is an exploded perspective view of the main body shown in FIG. 12; FIG. 14 is an exploded perspective view of the panel module shown in FIG. 13; FIG. 14 is a perspective view showing an appearance of Application Example 1 of the panel module shown in FIG. 13. FIG. FIG. 11 is a perspective view showing an appearance of Application Example 2; (A) is a perspective view showing the appearance seen from the front side of Application Example 3, and (B) is a perspective view showing the appearance seen from the back side. FIG. 12 is a perspective view showing an appearance of Application Example 4; FIG. 12 is a perspective view showing an appearance of Application Example 5; (A) is a front view of the application example 6 in its open state, (B) is its side view, (C) is its closed state front view, (D) is its left side view, (E) is its right side view, (F) is a top view, and (G) is a bottom view. 2 is a perspective view showing an example of the appearance of a lighting device to which the light emitting device shown in FIG. 1 and the like is applied; FIG. FIG. 22 is a perspective view showing another example of the lighting device shown in FIG. 21; FIG. 22 is a perspective view showing another example of the lighting device shown in FIG. 21;

Hereinafter, embodiments of the present technology will be described in detail with reference to the drawings. The description will be given in the following order.
1. First Embodiment (Light Emitting Device: Example of Having a Reflector Between Adjacent Wavelength Conversion Members)
2. Modification 1 (an example in which the reflecting portion is configured by a part of the holder that holds the wavelength converting member)3. Modification 2 (Example of having a light absorbing portion between adjacent wavelength conversion members)
4. 5. Second embodiment (light-emitting device: example having a wavelength converting portion between adjacent wavelength converting members); Modified example 3 (an example of using a wavelength conversion film that covers the end of the container of the wavelength conversion member as the wavelength conversion part)
6. Third Embodiment (Light-emitting device: example in which the pitch of light sources between adjacent light-emitting portions is wider than the pitch of light sources in one light-emitting portion)
7. Application examples (display devices, lighting devices)

<First Embodiment>
FIG. 1 illustrates the overall configuration of a light-emitting device (light-emitting device 1) according to a first embodiment of the present technology. This light-emitting device 1 is used, for example, as a backlight for illuminating a transmissive liquid crystal panel from behind. and an optical sheet 50 . The light guide plate 20 has a light incident surface 20A on its left and right end surfaces, and light exit surfaces 20B and 20D on its front and back main surfaces (the widest surfaces). That is, the light emitting device 1 is an edge type light emitting device.

In this specification, the stacking direction of the optical sheet 50, the light guide plate 20, and the reflecting member 40 is referred to as the z (back and forth) direction, the horizontal direction of the main surface of the light guide plate 20 is referred to as the x direction, and the vertical direction is referred to as the y direction.

The light source 10 is, for example, an LED that emits blue light (eg, wavelength of about 430 to 495 nm). Specifically, the light source 10 is sealed in a package (package 11 in FIG. 2 to be described later) and mounted on a light source substrate 12 . The light source substrate 12 supports the light source 10 and supplies electric power to the light source 10. For example, the light source substrate 12 has a wiring pattern on a rectangular glass epoxy substrate, metal substrate, or flexible substrate. A plurality of light sources 10 are arranged along the longitudinal direction (y direction) of a rectangular light source substrate 12 . One light source 10 may be provided, or one light source 10 may be provided on one light source substrate 12 and a plurality of such light sources may be arranged.

The wavelength converting member 30 is provided between the light source 10 and the light incident surface 20A of the light guide plate 20 . The wavelength conversion member 30 absorbs light of a wavelength emitted by the light source 10 and then generates light of a different wavelength. That is, the light from the light source 10 is partly or wholly wavelength-converted by the wavelength converting member 30, and then enters the light incident surface 20A.

FIG. 2 shows an enlarged view of part of the wavelength conversion member 30 . The wavelength converting member 30 is obtained by enclosing a wavelength converting substance 31 in a tubular container 32 (capillary) made of glass or the like. The wavelength conversion substance 31 contains, for example, a fluorescent pigment, a fluorescent dye, a quantum dot, or the like, absorbs the light from the light source 10, converts it into light of another wavelength, and emits it (for example, FIG. 2 light ν1). The wavelength conversion material 31 absorbs, for example, the blue light of the light source 10 and converts part of it into red light (wavelength 620-750 nm) or green light (wavelength 495-570 nm). Therefore, when the light from the light source 10 passes through the wavelength conversion material 31, the red, green and blue lights are combined to produce white light. The container 32 has a role of suppressing deterioration of the wavelength conversion substance 31 due to moisture and oxygen in the air and facilitating handling of the wavelength conversion substance 31 .

Preferably, the wavelength converting material 31 contains quantum dots. A quantum dot is a particle with a long diameter of about 1 nm to 100 nm and has discrete energy levels. Since the energy state of a quantum dot depends on its size, it is possible to freely select the emission wavelength by changing the size. In addition, the emitted light of quantum dots has a narrow spectrum width. Combining light with such steep peaks expands the color gamut. Therefore, by using quantum dots as the wavelength conversion substance 31, it is possible to easily expand the color gamut. Furthermore, quantum dots have high responsiveness and can efficiently use the light from the light source 10 . In addition, it has high stability. Quantum dots are, for example, compounds of Group 12 elements and Group 16 elements, compounds of Group 13 elements and Group 16 elements, or compounds of Group 14 elements and Group 16 elements. CdS, PdS, PbSe, CdHgTe, or the like.

As shown in FIG. 3A, one light-emitting portion 10E includes one wavelength conversion member 30 and a plurality of light sources 10 for making light incident thereon. A plurality of light incident surfaces 20A (for example, the right end surface of the light guide plate 20 in FIG. 3A) are provided facing each other. The container 32 (wavelength conversion member 30) extends in the length direction (y-direction) of the light incident surface 20A, and the light emitting portions 10E are arranged along this extension direction.

When the light incident surface 20A of the light guide plate 20 is the upper and lower end surfaces, as shown in FIG. 3B, a plurality of light emitting units 10E are arranged along the x direction. When the size of the display panel illuminated by the light-emitting device 1 is large (for example, 55 inches or more), it is particularly preferable to provide a plurality of light-emitting portions 10E in this manner in order to maintain the reliability of the container 32 . Further, when the light emitting section 10E is arranged on the long side of the light guide plate 20 having a rectangular plane (FIG. 3B), the luminance is improved compared to when it is arranged on the short side (FIG. 3A).

In this embodiment, a reflecting portion 33 is provided between adjacent light emitting portions 10E. Although the details will be described later, the reflective portion 33 constitutes a structure for preventing color unevenness, and blocks light from the light source 10 directly directed toward the light incident surface 20A of the light guide plate 20 without passing through the wavelength conversion member 30. .

The reflecting portion 33 is provided between the adjacent containers 32 and covers the ends of the two containers 32 with, for example, an arcuate recess (FIG. 2). The reflecting portion 33 returns the light ν2 directed between the adjacent containers 32 from the light source 10 to the wavelength converting member 30 (wavelength converting substance 31), and is made of highly reflective material such as white resin or oxide. It is made of a resin mixed with a highly reflective metal such as titanium. For example, PC (polycarbonate), PPA (polyphthalamide), PPA/PCT (polycyclohexylene-dimethylene-terephthalate), epoxy resin, or the like can be used as the resin material. The reflecting portion 33 may be made of metal or the like coated with a high-reflection coating. The reflecting portion 33 is provided from between the adjacent containers 32 to between the adjacent light sources 10, and is fixed to a part of the light emitting portion 10E such as the light source substrate 12, for example. The reflecting portion 33 may be cap-shaped to cover only the ends of the containers 32, or may be separated between one end and the other end of the two adjacent containers 32. good.

The light guide plate 20 is mainly composed of, for example, a transparent thermoplastic resin such as polycarbonate resin (PC) or acrylic resin, and directs the light from the light source 10 incident on the light incident surface 20A to the light exit surface 20B (see FIG. 1). main surface on the optical sheet 50 side). The light exit surface 20B is provided with a concavo-convex pattern including, for example, fine convex portions 20C in order to improve the straightness of light propagating through the light guide plate 20 . The convex portion 20C is, for example, a band-shaped protrusion or ridge extending in one direction (the x direction in FIG. 1) of the light exit surface 20B. On the light exit surface 20D facing the light exit surface 20B, for example, a scattering agent is printed in a pattern as a scattering portion that scatters and homogenizes the light propagating through the light guide plate 20 . As the scattering portion, instead of the scattering agent, it is possible to provide a portion containing a filler or to partially roughen the surface.

The reflecting member 40 ( FIG. 1 ) is a plate-like or sheet-like member that faces the main surface of the light guide plate 20 and is provided on the light emitting surface 20</b>D side of the light guide plate 20 . The reflecting member 40 directs light leaked from the light source 10 to the light emitting surface 20D side of the light guide plate 20 and light emitted from the inside of the light guide plate 20 to the light emitting surface 20D side to the light guide plate 20 side. It is to return. The reflecting member 40 has functions such as reflection, diffusion and scattering, for example. This makes it possible to efficiently use the light from the light source 10 and increase the front luminance.

The reflective member 40 is made of, for example, foamed PET (polyethylene terephthalate), silver-deposited film, multi-layer reflective film, or white PET. When the reflecting member 40 is to have a function of specular reflection (specular reflection), it is preferable that the surface is subjected to silver vapor deposition, aluminum vapor deposition, multilayer film reflection, or the like. When the reflecting member 40 has a fine shape, the fine shape can be integrally formed by a method such as hot press molding or melt extrusion molding using a thermoplastic resin. Examples of thermoplastic resins include acrylic resins such as PC and PMMA (polymethyl methacrylate), polyester resins such as PET, amorphous copolymer polyester resins such as MS (methyl methacrylate-styrene copolymer), and polystyrene resins. and polyvinyl chloride resin can be used. The fine shape may be formed by, for example, applying an energy ray (for example, ultraviolet) curable resin onto a base material made of PET or glass, and then transferring a pattern to the resin.

The optical sheet 50 is provided on the light exit surface 20B side of the light guide plate 20, and includes, for example, a diffuser plate, a diffuser sheet, a lens film, and a polarization separation sheet. FIG. 1 shows only one of the plurality of optical sheets 50 . By providing the optical sheet 50, the light emitted obliquely from the light guide plate 20 can be raised in the front direction, and the front brightness can be further increased.

In this light emitting device 1 , light generated by the light source 10 is wavelength-converted by the wavelength converting member 30 and enters the light incident surface 20</b>A of the light guide plate 20 . This light travels inside the light guide plate 20 , is emitted from the light emitting surface 20</b>B, and passes through the optical sheet 50 .

Here, since the reflecting portion 33 is provided between the adjacent light emitting portions 10E, the amount of light directly incident on the light incident surface 20A of the light guide plate 20 from the light source 10 without passing through the wavelength conversion member 30 can be suppressed. can.

FIG. 4A shows a planar configuration of the light emitting device 100 according to the comparative example viewed from the light exit surface (xy plane) side. In this light-emitting device 100, as in the light-emitting device 1, a plurality of light-emitting portions 10E are provided facing one light incident surface 20A (for example, the lower end surface) of the light guide plate 20. FIG.

However, there is no light shielding structure such as a reflective portion between adjacent light emitting portions 10E. Since the containers 32 made of glass or the like undergo thermal expansion and contraction, the containers 32 cannot be brought into contact with each other and fixed, and a gap (gap 133) is provided between the adjacent containers 32 . In addition, due to the thickness of the container 32 and the like, there are portions at the ends of the container 32 where the wavelength conversion substance 31 is not enclosed. As shown in FIG. 4B, on the light incident surface 20A of the light emitting device 100, in addition to the light ν1 from the light source 10 that has passed through the wavelength converting material 31 of the wavelength converting member 30, the light adjacent to the light source 10 is provided. A light ν102 passes through the matching container 32 (wavelength conversion material 31) and reaches it. The wavelength of light ν 102 is the same as the wavelength of light generated by light source 10 .

In this case, as shown in FIG. 5, in the light-emitting device 100, bluish color unevenness B caused by the light ν102 is observed along the sides (for example, upper and lower sides) where the light-emitting portion 10E is provided.

On the other hand, in the present embodiment, since the reflecting portion 33 is provided between the adjacent containers 32, the light ν2 (FIG. 2) traveling from the light source 10 to the light emitting portion 10E is wavelength-converted by the reflecting portion 33. It returns to the substance 31 side and is wavelength-converted. Therefore, it is possible to prevent the light from the light source 10 from directly reaching the light incident surface 20</b>A of the light guide plate 20 without passing through the wavelength conversion member 30 . Therefore, it is possible to suppress the occurrence of color unevenness caused by the blue light of the light source 10 and improve the in-plane color uniformity.

As described above, in the present embodiment, the reflecting portion 33 is provided between the adjacent light emitting portions 10E. In-plane color uniformity can be enhanced.

Modifications of the above-described embodiment and other embodiments will be described below.

<Modification 1>
FIG. 6 shows a planar configuration of a light-emitting device (light-emitting device 1A) according to Modification Example 1 of the first embodiment, viewed from the light incident surface 20A of the light guide plate 20. As shown in FIG. In this light emitting device 1A, the reflecting portion is configured by a portion (partition portion 33) of a holder (holder 34) that holds the wavelength conversion member 30. As shown in FIG. Except for this point, the light-emitting device 1A has the same configuration as the light-emitting device 1 of the first embodiment, and also has the same action and effect.

The holder 34 has a function of fixing the wavelength conversion member 30 and maintaining the distance between the wavelength conversion member 30 and the light source 10 at a predetermined value. Thereby, contact between the wavelength conversion member 30 and the light source 10 due to thermal expansion or the like can be prevented. This holder 34 has, for example, a substantially rectangular parallelepiped shape, and has an opening facing the passing direction (x direction) of light from the light source 10 to the light incident surface 20A. Specifically, the holder 34 includes an upper surface portion 34U and a lower surface portion 34D that sandwich the wavelength conversion member 30 from a direction orthogonal to the extending direction of the container 32, and a pair of side walls 34S that connect the upper surface portion 34U and the lower surface portion 34D. It is This holder 34 has a partition portion 33A. 33 A of partition parts oppose the side wall 34S with the container 32 (wavelength conversion member 30) in between, and are arrange|positioned between the wavelength conversion members 30 which adjoin when the wavelength conversion member 30 is accommodated in the holder 34. FIG. As a result, the amount of light that directly enters the light incident surface 20A of the light guide plate 20 from the light source 10 can be reduced.

The partition portion 33A is provided from the upper surface portion 34U to the lower surface portion 34D. This partition part 33A prevents the adjacent containers 32 from coming into contact with each other, and has the same function as the reflecting part 33 of the light emitting device 1, that is, the wavelength converting member 30 (wavelength It also has the function of returning to the conversion substance 31) side. The holder 34 having the partition portion 33A is made of, for example, a resin mixed with a highly reflective metal such as titanium oxide. For example, PC (polycarbonate), PPA (polyphthalamide), PPA/PCT (polycyclohexylene-dimethylene-terephthalate), epoxy resin, or the like can be used as the resin material. When the container 32 is made of glass, it is preferable to use PPA, which has a coefficient of thermal expansion close to that of glass and is advantageous in terms of cost. Specifically, "Genestar (registered trademark)" manufactured by Kuraray Co., Ltd. and the like can be mentioned. The holder 34 may be made of metal or the like coated with a high reflection coating.

As shown in FIG. 7, it is preferable to provide a cushioning member 35 between the end of the container 32 on the side wall 34S side and the holder 34 . The cushioning member 35 prevents contact between the container 32 and the holder 34, and presses the container 32 against the partition 33A to maintain the arrangement of the partition 33A and the container 32 stably. An elastic body such as urethane foam can be used for the cushioning member 35 .

<Modification 2>
The light-emitting device (light-emitting device 1B) according to Modification 2 of the first embodiment has a light-absorbing portion (light-absorbing portion 36) between adjacent light-emitting portions 10E as a structure for preventing color unevenness. Except for this point, the light-emitting device 1B has the same configuration as the light-emitting device 1 of the first embodiment, and also has the same function and effect.

As shown in FIG. 8, the light absorption part 36 is provided between adjacent containers 32, and covers the end of the container 32 with, for example, an arcuate recess. The light absorbing portion 36 absorbs and shields the light ν2 directed between the adjacent containers 32 from the light source 10, and is made of, for example, black PC, PPA, black urethane foam, or the like. The light-emitting device 1B is lower in luminance than the light-emitting device 1, but can improve color uniformity more than the light-emitting device 100. FIG.

<Second Embodiment>
A light-emitting device (light-emitting device 2) according to the second embodiment of the present technology has a wavelength conversion unit (wavelength conversion unit 37) as a color unevenness prevention structure between adjacent light-emitting units 10E. Except for this point, the light-emitting device 2 has the same configuration as the light-emitting device 1 of the first embodiment, and also has the same action and effect.

As shown in FIG. 9, the wavelength converting section 37 is provided between adjacent containers 32, and covers the ends of the two containers 32 with, for example, an arcuate concave portion. This wavelength conversion section 37 converts the wavelength of the light ν2 directed between the adjacent containers 32 from the light source 10 . Specifically, it absorbs blue light from the light source 10 and emits light of a wavelength different from that of blue light, such as red light or green light. Thereby, the amount of light directly incident on the light incident surface 20A of the light guide plate 20 from the light source 10 can be suppressed, and the uniformity of the color of the light emitting device 2 can be improved. In addition, since the light generated by the light source 10 can be used efficiently, the luminance can be improved as compared with the first embodiment. The wavelength converting portion 37 is made of a resin material mixed with a phosphor such as a fluorescent pigment or a fluorescent dye. For example, silicone or the like can be used as the resin material. The wavelength conversion part 37 may be separated between one end and the other end of the adjacent containers 32 .

<Modification 3>
The light-emitting device (light-emitting device 2A) according to Modification 3 of the second embodiment has a wavelength conversion film (wavelength conversion film 38) at the end of the container 32 as a wavelength conversion section. Except for this point, the light emitting device 2A has the same configuration as the light emitting device 2 of the second embodiment, and also has the same function and effect.

As shown in FIG. 10, the wavelength conversion film 38 covers the ends of the adjacent containers 32 facing each other. This wavelength conversion film 38 converts the wavelength of the light ν2 directed between the adjacent containers 32 from the light source 10 in the same manner as the wavelength conversion section 37 of the light emitting device 2. It is formed by applying to the part.

<Third Embodiment>
A light-emitting device (light-emitting device 3) according to the third embodiment of the present technology has a color unevenness prevention structure formed by the pitch (pitch P2) of the light sources 10 between the adjacent light-emitting portions 10E. Except for this point, the light-emitting device 3 has the same configuration as the light-emitting device 1 of the first embodiment, and its action and effect are also the same.

As shown in FIG. 11, the plurality of light sources 10 are arranged at a predetermined pitch P1 (first pitch) within one light emitting section 10E, while the two light sources 10 that are closest to each other among the adjacent light emitting sections 10E The two light sources 10 are provided at a pitch P2 (second pitch) wider than the pitch P1. In the present embodiment, the pitch P2 prevents the light from the light source 10 from directly entering the light incident surface 20A of the light guide plate 20 .

In this light emitting device 3, the adjacent light sources 10 arranged at the pitch P2 are provided inside the wavelength converting member 30 compared to the case where the other light sources 10 are arranged at the same pitch P1. Therefore, most of the light ν2 directed between the adjacent wavelength conversion members 30 from the light sources 10 arranged at the pitch P2 passes through the wavelength conversion material 31 . Therefore, the amount of light directly directed from the light source 10 to the light incident surface 20A of the light guide plate 20 can be suppressed, and the uniformity of color can be improved.

FIG. 12 shows the appearance of a display device 101 to which the light emitting device 1 (or the light emitting devices 1A, 1B, 2, 2A and 3) is applied. This display device 101 is used, for example, as a flat-panel television device, and has a configuration in which a flat plate-like body portion 102 for image display is supported by a stand 103 . The display device 101 is used as a stationary type by placing it on a horizontal surface such as a floor, a shelf, or a stand with the stand 103 attached to the main body 102 . It can also be used as a wall-mounted type.

FIG. 13 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 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 a power 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 bracket, mounting a substrate, etc., and mounting the stand 103 . The rear exterior member 113 covers the rear and side surfaces of the panel module 112 .

FIG. 14 is an exploded view of the panel module 112 shown in FIG. The panel module 112 includes, for example, a front housing (top chassis) 121, a liquid crystal panel 122, a frame member (middle chassis) 90, a light emitting device 1, and a rear housing (back chassis) from the front side (viewer side). 124, a balancer board 125, a balancer cover 126 and a timing control board 127 in this order.

The front housing 121 is a frame-shaped metal part that covers the front edge of the liquid crystal panel 122 . The liquid crystal panel 122 has, for example, a liquid crystal cell 122A, a source substrate 122B, and a flexible substrate 122C such as COF (Chip On Film) connecting these. The frame member 90 is a frame-shaped resin component that holds the liquid crystal panel 122 and the optical sheet 50 of the light emitting device 1 . The rear housing 124 is a metal component made of iron (Fe) or the like, which accommodates the liquid crystal panel 122 , the frame member 90 and the light emitting device 1 . The balancer board 125 controls the light emitting device 1 and is mounted on the rear surface of the rear housing 124 and covered with the balancer cover 126 as shown in FIG. A timing control board 127 is also mounted on the rear 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 above embodiment, since the light-emitting device 1 with improved in-plane color uniformity is provided, the display device 101 can perform high-quality display.

An example of application of the panel module 112 as described above to an electronic device will be described below. Examples of electronic devices include television devices, digital cameras, laptop personal computers, portable 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 an externally input video signal or an internally generated video signal as an image or video.

(Application example 1)
15A and 15B show the appearance of an electronic book to which the panel module 112 of the above embodiment is applied. This electronic book has, for example, a display section 210 and a non-display section 220, and the display section 210 is configured by the display device 101 of the above embodiment.

(Application example 2)
FIG. 16 shows the appearance of a smart phone to which the panel module 112 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)
FIG. 17 shows the appearance of a digital camera to which the panel module 112 of the above embodiment is applied. This digital camera has, 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. 18 shows the appearance of a notebook personal computer to which the panel module 112 of the above embodiment is applied. This notebook personal computer has, for example, a main body 510, a keyboard 520 for inputting characters and the like, and a display unit 530 for displaying images. It is configured.

(Application example 5)
FIG. 19 shows the appearance of a video camera to which the panel module 112 of the above embodiment is applied. This video camera has, for example, a body section 610, a subject photographing lens 620 provided on the front side surface of the body section 610, a start/stop switch 630 for photographing, and a display section 640. This display unit 640 is configured by the display device 101 of the above embodiment.

(Application example 6)
FIG. 20 shows the appearance of a mobile phone to which the panel module 112 of the above embodiment is applied. For example, this mobile phone has an upper housing 710 and a lower housing 720 connected by a connecting portion (hinge portion) 730, and has a display 740, a sub-display 750, a picture light 760 and a camera 770. there is Of these, the display 740 or the sub-display 750 is configured by the display device 101 of the above embodiment.

FIG. 21 shows the appearance of a lighting device to which the light emitting device 1 (or the light emitting devices 1A, 1B, 2, 2A and 3) is applied. This lighting device is a tabletop lighting device that includes the light emitting device 1 (or the light emitting devices 1A, 1B, 2, 2A, and 3) of the above embodiment. , an illumination unit 843 is attached. The illumination unit 843 is configured by the light emitting devices 1 and 2 according to the first and second embodiments. By forming the light guide plate 20 into a curved shape, the illumination section 843 can have an arbitrary shape such as a cylindrical shape shown in FIG. 21 or a curved surface shape shown in FIG.

The light emitting device 1 may be applied to an indoor lighting device as shown in FIG. In this lighting device, the lighting section 844 is composed of the light emitting device 1 described above. The illuminating units 844 are arranged at appropriate numbers and intervals on the ceiling 850A of the building. Note that the illumination unit 844 can be installed not only on the ceiling 850A, but also on a wall 850B, a floor (not shown), or any other place depending on the application.

In these lighting devices, illumination is performed with light from the light emitting device 1 . Here, as described in the above embodiment, since the light emitting device 1 with improved in-plane color uniformity is provided, light of uniform color can be obtained.

Although the present technology has been described above with reference to the embodiments and modifications, the present technology is not limited to the above-described embodiments, and various modifications are possible. For example, in the above embodiments and the like, the case where the light source 10 that emits blue light is used has been described, but the light source 10 may emit light of other colors such as red or green. In addition, in the above embodiment and the like, the case where white light is generated from blue light by passing through the wavelength conversion member 30 has been described, but light other than white such as orange or red may be obtained.

In addition, in the above-described embodiment and the like, the case where the light incident surface 20A of the light guide plate 20 is the left and right end surfaces has been described. One may be sufficient, and three or more may be sufficient. It is also possible to arrange the light source 10 at a position facing the main surface of the light guide plate 20 to make the light emitting device 1 (or the light emitting device 2) a direct type. Further, the planar shape of the light guide plate 20 may correspond to the shape of the object illuminated by the light emitting device 1, and may be other than rectangular. In addition, in the above embodiments and the like, the case where the light guide plate 20 is used as an optical component has been described. may be used to guide the

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

In addition, although the configurations of the light-emitting devices 1 and 2, the display device 101 (television device), and the like have been specifically described in the above embodiments, it is not necessary to include all the components, and other Further components may be provided.

Furthermore, for example, the materials and thicknesses of the parts described in the above embodiments are not limited, and other materials and thicknesses may be used.

1, 1A, 1B, 2, 2A, 3... Light emitting device 10... Light source 11... Package 12... Light source substrate 20... Light guide plate 20A... Light incident surface 20B, 20D... Light emitting surface 20C... Convex Part 30... Wavelength conversion member 31... Wavelength conversion substance 32... Container 33... Reflection part 34... Holder 33A... Partition part 35... Buffer member 36... Light absorption part 37... Wavelength conversion part 38... Wavelength conversion film P1, P2 Pitch 40 Reflective member 50 Optical sheet 90 Frame member 101 Display device.

Claims (15)

a liquid crystal display panel;
a light-emitting device arranged on the back side of the liquid crystal display panel,
The light emitting device
a light source;
a wavelength converting material comprising quantum dots encapsulated in a material that converts the wavelength of light emitted from the light source and is resistant to degradation by moisture or oxygen , absorbing the light emitted from the light source and emitted from the light source a plurality of wavelength conversion members each emitting light having a wavelength different from the wavelength of the light ;
Optics having a light incident surface facing the light source through the plurality of wavelength conversion members and receiving light from the plurality of wavelength conversion members , and a light exit surface facing the back side of the liquid crystal display panel. parts and
at least one light source substrate that supports and powers the light source;
having one or more recesses disposed between the plurality of adjacent wavelength conversion members so as to reflect or absorb light emitted from the light source directed between the plurality of adjacent wavelength conversion members A display device, comprising: a prevention structure. The display device according to claim 1, wherein the light exit surface has an uneven pattern. The display device according to claim 2, wherein the concave-convex pattern of the optical component includes convex portions. The display device according to claim 1, wherein the light source is a light emitting diode that generates blue light. The at least one light source substrate has a wiring pattern,
The display device according to claim 4. wherein the optical component is a waveguide;
The display device according to claim 5. 2. The display device according to claim 1, further comprising a reflecting member facing said back surface of said liquid crystal display panel. The display device according to claim 7, wherein the reflecting member has a function of diffusing light. the quantum dots have axes from 1 nanometer to 100 nanometers;
8. The display device of claim 7, wherein the material is a resin that encapsulates the quantum dots and forms a film. The display device according to claim 2 , wherein the concave/convex pattern includes convex portions. 2. The display device according to claim 1, further comprising a front housing in front of said liquid crystal display panel. The display device according to claim 11, wherein the front housing is made of metal. 2. The display device according to claim 1, further comprising a rear housing provided on the back side of the light source substrate and housing the liquid crystal display panel. The light emitting device has a plurality of light emitting units,
The plurality of light emitting units each include a plurality of the light sources,
the plurality of light sources in the first light emitting unit of the plurality of light emitting units are arranged at a first pitch;
2. The display device according to claim 1, wherein the plurality of light sources in the second light emitting section among the plurality of light emitting sections are arranged at a second pitch different from the first pitch. 15. The display device of Claim 14, wherein the second pitch is longer than the first pitch.

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