JP6961754B2 - 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.

A surface 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, in Patent Document 1, a film coated with a fluorescent substance is provided on the light emission observation surface (light emitting surface) of the light guide plate, and the light incident on the light guide plate from the blue LED is wavelength-converted by the fluorescent material to obtain white light. Is described. Further, Patent Document 2 describes that a wavelength converter in which a fluorescent substance is mixed with an elastic body is provided between the blue LED and the end surface (light incident surface) of the light guide plate.

Japanese Patent No. 3116727 Japanese Patent No. 3114805

In a light emitting device used as a surface light source, it is generally strongly desired to increase the uniformity of color (chromaticity) in 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 having improved in-plane color uniformity.

The 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 of the light emitting devices has a light source and a wavelength conversion member. , The wavelength conversion member converts the wavelength of light emitted from the light source, the wavelength conversion member has a wavelength conversion material including quantum dots, and the quantum dots have an axis of 1 nanometer to 100 nanometers. An optical component of a resin arranged so as to receive light and having a plurality of light emitting portions and light incident surfaces facing the plurality of light emitting portions, which are directed toward the back surface of the display panel and with respect to the light incident surface. The light emitting surface has a vertical light emitting surface, and the light emitting surface has an optical component having a concavo-convex pattern, and a structure for preventing light from entering from the first light emitting portion to the adjacent light emitting portion, and has a plurality of concave portions. Each recess comprises a prevention structure, each of which is configured in relation to one corresponding end of a plurality of light emitting portions.

A display device according to another 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. The light emitting device is a light source and a wavelength conversion member, and has a wavelength. The conversion member converts the wavelength of the light emitted from the light source, the wavelength conversion member has a wavelength conversion material containing quantum dots, and the quantum dots have an axis of 1 nanometer to 100 nanometers and light. An optical component having a light source and a wavelength conversion member in a resin arranged so as to receive the light, and an optical component having a light incident surface facing the light source and having a light emitting surface facing the back surface of the display panel, and a light source. A conversion member having at least one light source substrate and one or more recesses, which is arranged with respect to the first light source and the related first wavelength conversion member, and the light from the first light source is adjacent to the first light source. It is provided with a preventive structure that suppresses absorption by the region.

The light emitting device according to still another embodiment of the present disclosure is a plurality of light emitting units each having a light source and a wavelength conversion member, and each light source is configured to emit light in the first wavelength range. The wavelength conversion member of the above has a wavelength conversion material and is configured to convert emitted light in the first wavelength range, so that the wavelength conversion material has an axis of 1 nanometer to 100 nanometers and receives light. A light emitting part having a plurality of light emitting parts including particles in the resin arranged in the light emitting part, a light incident surface facing the plurality of light emitting parts, and a light emitting component in the first wavelength range are suppressed from entering the light guide component. The prevention structure includes, and the prevention structure is provided with a wavelength conversion unit arranged between at least a pair of adjacent wavelength conversion members, and the wavelength conversion member is a respective of the adjacent wavelength conversion members. Facing away from the corresponding end of the, the prevention structure has a plurality of circular recesses, each recess associated with one corresponding end of an adjacent wavelength conversion member. NS.

In the display device and the light emitting device of the present disclosure, the amount of light that is incident on the optical component without passing through the wavelength conversion member is reduced among the light generated by the light source due to the prevention structure. That is, the wavelength of the light from the light source is 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 of the light source in the plane from being remarkably stronger than the color of the light that has passed through the wavelength conversion member. be able to. Therefore, it is possible to prevent color unevenness and improve in-plane color uniformity.

It is a perspective view which shows the whole structure of the light emitting device which concerns on 1st Embodiment of this technique. It is a figure which shows the light beam bundle from the light source shown in FIG. 1 toward the light incident surface of a light guide plate. It is sectional drawing for demonstrating the structure of the light emitting part shown in FIG. It is a figure which shows the structure of the light emitting device which concerns on a comparative example. It is a top view which shows the light observed from the light emitting device shown in FIG. It is a top view which shows the structure of the light emitting part which concerns on modification 1. FIG. FIG. 5 is a cross-sectional view showing an example of a configuration between the end of the container and the holder shown in FIG. It is sectional drawing which shows the structure of the light emitting part which concerns on modification 2. It is sectional drawing which shows the structure of the light emitting part which concerns on 2nd Embodiment of this technique. It is sectional drawing which shows the structure of the light emitting part which concerns on modification 3. It is sectional drawing which shows the structure of the light emitting part which concerns on 3rd Embodiment of this technique. FIG. 5 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. It is a perspective view which shows the main body part shown in FIG. 12 by disassembling. It is a perspective view which shows the panel module shown in FIG. 13 by disassembling. It is a perspective view which shows the appearance of the application example 1 of the panel module shown in FIG. It is a perspective view which shows the appearance of application example 2. FIG. (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. It is a perspective view which shows the appearance of application example 4. FIG. It is a perspective view which shows the appearance of application example 5. (A) is a front view of Application Example 6 in an open state, (B) is a side view thereof, (C) is a front view in a closed state, (D) is a left side view, and (E) is a right side view. (F) is a top view and (G) is a bottom view. It is a perspective view which shows an example of the appearance of the illuminating device to which the light emitting device shown in FIG. 1 and the like is applied. It is a perspective view which shows the other example of the lighting apparatus shown in FIG. It is a perspective view which shows the other example of the lighting apparatus shown in FIG.

Hereinafter, embodiments of the present technology will be described in detail with reference to the drawings. The explanation will be given in the following order.
1. 1. 1st Embodiment (Light emitting device: Example of having a reflecting part between adjacent wavelength conversion members)
2. Modification 1 (Example in which the reflecting portion is composed of a part of a holder for holding the wavelength conversion member) 3. Modification 2 (Example of having an absorbent part between adjacent wavelength conversion members)
4. Second embodiment (light emitting device: an example in which a wavelength conversion unit is provided between adjacent wavelength conversion members) 5. Modification 3 (Example of using a wavelength conversion film that covers the end of the container of the wavelength conversion member as the wavelength conversion unit)
6. Third embodiment (light emitting device: an example in which the pitch of the light source between adjacent light emitting units is wider than the pitch of the light source in one light emitting unit)
7. Application example (display device, lighting device)

<First Embodiment>
FIG. 1 shows the overall configuration of a light emitting device (light emitting device 1) according to the first embodiment of the present technology. This light emitting device 1 is used as a backlight that illuminates a transmissive liquid crystal panel from behind, for example, a light emitting unit 10E including a light source 10 and a wavelength conversion member 30, a light guide plate 20 (optical component), and a reflecting member 40. And has an optical sheet 50. The light guide plate 20 has light incident surfaces 20A on both left and right end surfaces, and light emitting surfaces 20B and 20D on the front and back main surfaces (widest surfaces). That is, the light emitting device 1 is an edge type light emitting device.

In the present specification, the stacking direction of the optical sheet 50, the light guide plate 20 and the reflective member 40 is referred to as the z (front-back) direction, the left-right 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 generates blue light (for example, a wavelength of about 430 to 495 nm), and a plurality of light sources 10 are provided facing the light incident surface 20A of the light guide plate 20. Specifically, the light source 10 is sealed in a package (package 11 in FIG. 2 described later) and mounted on the light source substrate 12. The light source substrate 12 is for supporting the light source 10 and supplying electric power to the light source 10, and has a wiring pattern on, for example, a rectangular glass epoxy substrate, a metal substrate, or a flexible substrate. A plurality of light sources 10 are arranged along the longitudinal direction (y direction) of the rectangular light source substrate 12. The number of light sources 10 may be one, or one light source 10 may be provided on one light source substrate 12 and a plurality of these may be arranged.

The wavelength conversion 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 having a wavelength emitted by the light source 10 and then generates light having a wavelength different from that of the light source 10. That is, the light of the light source 10 enters the light incident surface 20A after the wavelength conversion of a part or all of the light by the wavelength conversion member 30.

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

The wavelength conversion material 31 preferably contains quantum dots. Quantum dots are particles with a major axis of about 1 nm to 100 nm and have 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 emission light of quantum dots has a narrow spectrum width. The color gamut is expanded by combining light with such steep peaks. Therefore, by using quantum dots for the wavelength conversion substance 31, the color gamut can be easily expanded. Further, the quantum dots have high responsiveness, and the light of the light source 10 can be efficiently used. In addition, it is 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, a compound of a group 14 element and a group 16 element, and the like. CdS, PdS, PbSe, CdHgTe and the like.

As shown in FIG. 3A, one light emitting unit 10E includes one wavelength conversion member 30 and a plurality of light sources 10 for incident light on the wavelength conversion member 30, and in the light emitting device 1, the light emitting unit 10E is one. A plurality of light incident surfaces 20A (for example, the right end surface of the light guide plate 20 in FIG. 3A) are provided so as to face 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 the extending direction.

When the light incident surfaces 20A of the light guide plate 20 are the upper and lower end surfaces, a plurality of light emitting units 10E are arranged along the x direction as shown in FIG. 3 (B). When the size of the display panel irradiated 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 units 10E in this way in order to maintain the reliability of the container 32. Further, when the light emitting portion 10E is arranged on the long side of the light guide plate 20 having a rectangular flat surface (FIG. 3 (B)), the brightness is improved as compared with the case where the light emitting portion 10E is arranged on the short side (FIG. 3 (A)).

In the present embodiment, the reflecting unit 33 is provided between the adjacent light emitting units 10E. Although the details will be described later, the reflecting portion 33 constitutes a color unevenness prevention structure so as to block light directly from the light source 10 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 arc-shaped recess (FIG. 2). The reflecting unit 33 returns the light ν2 heading between the light source 10 and the adjacent containers 32 to the wavelength conversion member 30 (wavelength converting substance 31) side, and is a highly reflective material such as white resin or oxidation. It is composed of a resin or the like mixed with a metal having a high reflectance such as titanium. For this resin material, for example, PC (polycarbonate), PPA (polyphthalamide), PPA / PCT (polycyclohexylene dimethylene terephthalate), epoxy resin, or the like can be used. The reflective portion 33 may be made of a metal or the like having a highly reflective coating. The reflecting portion 33 is provided between the adjacent containers 32 and 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. The reflective portion 33 may have a cap shape that covers only the end portion of the container 32, or may be separated between one end portion and the other end portion of the two adjacent container 32 ends. good.

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

The reflective member 40 (FIG. 1) is a plate-shaped or sheet-shaped member facing the main surface of the light guide plate 20, and is provided on the light emitting emission surface 20D side of the light guide plate 20. The reflective member 40 directs the light leaked from the light source 10 to the light emitting surface 20D side of the light guide plate 20 and the light emitted from the inside of the light guide plate 20 to the light emitting surface 20D side to the light emitting surface 20 side. It is something to bring back. The reflective 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, multilayer reflective film or white PET. When the reflecting member 40 is provided with a function of regular reflection (specular reflection), it is preferable that the surface is subjected to a treatment such as silver vapor deposition, aluminum vapor deposition, or multilayer film reflection. When the reflective member 40 has a fine shape, the fine shape can be integrally formed by, for example, a hot press molding using a thermoplastic resin or a melt extrusion molding. Examples of the thermoplastic resin include PC, acrylic resin such as PMMA (polymethylmethacrylate), polyester resin such as PET, amorphous copolymerized polyester resin such as MS (copolymer of methylmethacrylate and styrene), and polystyrene resin. And polyvinyl chloride resin and the like can be used. The fine shape may be formed by applying an energy ray (for example, ultraviolet) curable resin on a substrate made of, for example, PET or glass, and then transferring a pattern to the resin.

The optical sheet 50 is provided on the light emitting surface 20B side of the light guide plate 20, and includes, for example, a diffusing plate, a diffusing sheet, a lens film, a polarization separating sheet, and the like. FIG. 1 shows only one of the plurality of optical sheets 50. By providing the optical sheet 50, it is possible to raise the light emitted obliquely from the light guide plate 20 in the front direction, and the front brightness can be further increased.

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

Here, since the reflecting unit 33 is provided between the adjacent light emitting units 10E, it is possible to suppress 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.

FIG. 4A shows a plane configuration in which the light emitting device 100 according to the comparative example is viewed from the light emitting surface (xy plane) side. Similar to the light emitting device 1, the light emitting device 100 is provided with a plurality of light emitting units 10E facing one light incident surface 20A (for example, the lower end surface) of the light guide plate 20.

However, there is no light-shielding structure such as a reflecting portion between the 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. Further, due to the thickness of the container 32 and the like, there is a portion at the end of the container 32 in which the wavelength converting substance 31 is not sealed. As shown in FIG. 4B, the light incident surface 20A of the light emitting device 100 is adjacent to the light source 10 in addition to the light ν1 that has passed through the wavelength conversion material 31 of the wavelength conversion member 30 from the light source 10. The light ν 102 that has passed through the matching container 32 (wavelength conversion material 31) arrives. The wavelength of the light ν 102 is the same as the wavelength of the light generated by the light source 10.

In this case, as shown in FIG. 5, in the light emitting device 100, a strong bluish color unevenness B caused by the light ν 102 is observed along the sides (for example, the upper and lower sides) where the light emitting unit 10E is provided.

On the other hand, in the present embodiment, since the reflecting unit 33 is provided between the adjacent containers 32, the light ν2 (FIG. 2) heading between the light source 10 and the light emitting unit 10E is wavelength-converted by the reflecting unit 33. It returns to the substance 31 side and is wavelength-converted. Therefore, it is possible to prevent the light of the light source 10 from directly reaching the light incident surface 20A 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 color uniformity in the plane.

As described above, in the present embodiment, since the reflecting unit 33 is provided between the adjacent light emitting units 10E, the amount of light directly incident on the light incident surface 20A of the light guide plate 20 from the light source 10 is reduced. In-plane color uniformity can be enhanced.

Hereinafter, modifications of the above-described embodiment and other embodiments will be described, but in the following description, the same components as those of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

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

The holder 34 has a function of fixing the wavelength conversion member 30 and holding the distance between the wavelength conversion member 30 and the light source 10 at a predetermined value. This makes it possible to prevent contact between the wavelength conversion member 30 and the light source 10 due to, for example, thermal expansion. The holder 34 has, for example, a substantially rectangular parallelepiped shape, and has an opening facing the light passing direction (x direction) from the light source 10 to the light incident surface 20A. Specifically, the holder 34 is composed of 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. Has been done. The holder 34 has a partition 33A. The partition portion 33A faces the side wall 34S with the container 32 (wavelength conversion member 30) in between, and is arranged between the wavelength conversion members 30 adjacent to each other when the wavelength conversion member 30 is housed in the holder 34. As a result, 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 reduced.

The partition portion 33A is provided from the upper surface portion 34U to the lower surface portion 34D, and the portion facing the end portion of the container 32 is formed into, for example, an arc-shaped concave shape to cover the end portion of the container 32. The partition portion 33A prevents contact between the adjacent containers 32 and has the same function as the reflection portion 33 of the light emitting device 1, that is, the light directed from the light source 10 to the adjacent containers 32 is transmitted to the wavelength conversion member 30 (wavelength). It also has a function of returning to the conversion substance 31) side. The holder 34 having the partition portion 33A is made of a resin mixed with a metal having a high reflectance such as titanium oxide. For this resin material, for example, PC (polycarbonate), PPA (polyphthalamide), PPA / PCT (polycyclohexylene dimethylene terephthalate), epoxy resin, or the like can be used. 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. Specific examples thereof include "Genesta (registered trademark)" manufactured by Kuraray. The holder 34 may be made of a metal having a highly reflective coating or the like.

As shown in FIG. 7, it is preferable to provide a cushioning member 35 between the end portion of the container 32 on the side wall 34S side and the holder 34. The cushioning member 35 can prevent the container 32 from coming into contact with the holder 34, and can press the container 32 against the partition 33A side to stably maintain the arrangement of the partition 33A and the container 32. For the cushioning member 35, an elastic body such as urethane foam can be used.

<Modification 2>
The light emitting device (light emitting device 1B) according to the second modification of the first embodiment has a light absorbing unit (absorbing unit 36) between adjacent light emitting units 10E as a color unevenness prevention structure. Except for this point, the light emitting device 1B 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. 8, the light absorbing portion 36 is provided between the adjacent containers 32, and covers the end portion of the container 32 with, for example, an arc-shaped recess. The light absorbing unit 36 absorbs light ν2 directed from the light source 10 to the adjacent containers 32 to block light, and is composed of, for example, a black PC, PPA, or a black urethane foam. Although the brightness of the light emitting device 1B is lower than that of the light emitting device 1, the color uniformity can be improved as compared with the light emitting device 100.

<Second Embodiment>
The 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 its action and effect are also the same.

As shown in FIG. 9, the wavelength conversion unit 37 is provided between adjacent containers 32, and covers the ends of the two containers 32 with, for example, an arc-shaped recess. The wavelength conversion unit 37 converts the wavelength of the light ν2 heading between the light source 10 and the adjacent containers 32. Specifically, it absorbs the blue light of the light source 10 and emits light having a wavelength different from that of the blue light, for example, red light or green light. As a result, 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 color uniformity 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 brightness can be improved as compared with the first embodiment. The wavelength conversion unit 37 is made of a resin material mixed with a phosphor such as a fluorescent pigment or a fluorescent dye. As the resin material, for example, silicone or the like can be used. The wavelength conversion unit 37 may be separated between one end and the other end of the adjacent containers 32.

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

As shown in FIG. 10, the wavelength conversion film 38 covers the opposite ends of the adjacent containers 32. Similar to the wavelength conversion unit 37 of the light emitting device 2, the wavelength conversion film 38 converts the wavelength of the light ν2 from the light source 10 to the adjacent containers 32. For example, a fluorescent paint is applied to the end of the container 32. It is formed by applying it to the part.

<Third embodiment>
The light emitting device (light emitting device 3) according to the third embodiment of the present technology has a color unevenness prevention structure configured by the pitch (pitch P2) of the light sources 10 between the adjacent light emitting units 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, while a plurality of light sources 10 are arranged at a predetermined pitch P1 (first pitch) in one light emitting unit 10E, the closest 2 of the adjacent light emitting units 10E Between the two light sources 10, a pitch P2 (second pitch) wider than the pitch P1 is provided. In the present embodiment, the pitch P2 prevents the light from the light source 10 from directly incident on the light incident surface 20A of the light guide plate 20.

In the light emitting device 3, the adjacent light sources 10 arranged at the pitch P2 are provided inside the wavelength conversion member 30 as compared with the case where the adjacent light sources 10 are arranged at the same pitch P1 as the other light sources 10. Therefore, most of the light ν2 heading between the adjacent wavelength conversion members 30 from the light source 10 arranged at the pitch P2 passes through the wavelength conversion substance 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 color uniformity can be improved.

FIG. 12 shows the appearance of the display device 101 to which the light emitting device 1 (or the light emitting devices 1A, 1B, 2, 2A, 3) is applied. The display device 101 is used as, for example, a flat-screen television device, and has a configuration in which a flat plate-shaped main body 102 for displaying an image is supported by a stand 103. The display device 101 is used as a stationary type by placing the stand 103 on a horizontal surface such as a floor, a shelf, or a stand with the stand 103 attached to the main body 102, but the stand 103 is removed from 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 front exterior member 111. The panel module 112 is fixed to the front exterior member 111, and the power supply board 115 and the signal board 116 are mounted on the back surface thereof, and the mounting bracket 117 is fixed. The mounting bracket 117 is for mounting a wall-mounted bracket, mounting a board or the like, and mounting a stand 103. The rear exterior member 113 covers the back surface and side surfaces of the panel module 112.

FIG. 14 is an exploded view of the panel module 112 shown in FIG. From the front side (viewer side), the panel module 112 includes a front chassis (top chassis) 121, a liquid crystal panel 122, a frame-shaped member (middle chassis) 90, a light emitting device 1, and a rear chassis (back chassis). It has 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 component that covers the front peripheral edge of the liquid crystal panel 122. The liquid crystal panel 122 has, for example, a liquid crystal cell 122A, a source substrate 122B, and a flexible substrate 122C such as a COF (Chip On Film) connecting them. The frame-shaped 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 that houses the liquid crystal panel 122, the frame-shaped member 90, and the light emitting device 1. The balancer substrate 125 controls the light emitting device 1, and is mounted on the back surface of the rear housing 124 and covered with the balancer cover 126 as shown in FIG. The timing control 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 by the liquid crystal panel 122 to display an image. Here, as described in the above embodiment, since the light emitting device 1 having improved in-plane color uniformity is provided, the display device 101 can perform high-quality display.

Hereinafter, an example of application of the panel module 112 to an electronic device as described above will be described. Examples of electronic devices include television devices, digital cameras, notebook personal computers, mobile terminal devices such as mobile phones, video cameras, and the like. In other words, the display device can be applied to electronic devices in all fields for displaying an externally input video signal or an internally generated video signal as an image or a video.

(Application example 1)
15 (A) and 15 (B) 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 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. 16 shows the appearance of a smartphone 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 light emitting unit 410 for a flash, a display unit 420, a menu switch 430, and a shutter button 440, and the display unit 420 is configured by the display device 101 of the above embodiment.

(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-type personal computer has, for example, a main body 510, a keyboard 520 for input operations of characters and the like, and a display unit 530 for displaying images, and the display unit 530 is based on the display device 101 of the above embodiment. 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 main body 610, a lens 620 for shooting a subject provided on the front side surface of the main body 610, a start / stop switch 630 at the time of shooting, and a display unit 640. The 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. This mobile phone has, for example, an upper housing 710 and a lower housing 720 connected by a connecting portion (hinge portion) 730, and has a display 740, a sub-display 750, a picture light 760, and a camera 770. There is. The display 740 or the sub-display 750 among these is configured by the display device 101 of the above-described embodiment.

FIG. 21 shows the appearance of the lighting device to which the light emitting device 1 (or the light emitting devices 1A, 1B, 2, 2A, 3) is applied. This lighting device is a tabletop lighting device provided with the light emitting device 1 (or light emitting device 1A, 1B, 2, 2A, 3) of the above embodiment, and is, for example, on a support column 842 provided on a base 841. , The lighting unit 843 is attached. The illumination unit 843 is composed of 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 unit 843 can have an arbitrary shape such as a cylindrical shape shown in FIG. 21 or a curved surface shape shown in FIG. 22.

The light emitting device 1 may be applied to an indoor lighting device as shown in FIG. 23. In this lighting device, the lighting unit 844 is configured by the light emitting device 1. The lighting units 844 are arranged on the ceiling 850A of the building in an appropriate number and at intervals. 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 lighting devices, lighting is performed by the light from the light emitting device 1. Here, as described in the above embodiment, since the light emitting device 1 having improved in-plane color uniformity is provided, it is possible to obtain light of uniform color.

Although the present technology has been described above with reference to the embodiments and modification examples, the present technology is not limited to the above-described embodiment, and various modifications are possible. For example, in the above-described embodiment and the like, the case where the light source 10 that generates blue light is used has been described, but the light source 10 may generate light of another color such as red or green. Further, in the above-described 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 for example, 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 surfaces 20A of the light guide plate 20 are the left and right end faces has been described, but the light incident surface 20A is one of the four end faces (upper, lower, left and right) surrounding the main surface. It may be one, or three or more. 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 to be irradiated by the light emitting device 1, and may be other than the rectangular shape. In addition, in the above-described embodiment and the like, the case where the light guide plate 20 is used as the optical component has been described. May be guided.

Furthermore, in the above-described 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 and the display device 101 (television device) have been specifically described in the above embodiment, it is not necessary to include all the components, and other components are not required. It may further include components.

Further, for example, the material and thickness of each part described in the above embodiment are not limited, and other materials and thickness 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 material, 32 ... Container, 33 ... Reflection part, 34 ... Holder, 33A ... Partition part, 35 ... Buffer member, 36 ... Absorption part, 37 ... Wavelength conversion part, 38 ... Wavelength conversion film, P1, P2 ... Pitch, 40 ... Reflective member, 50 ... Optical sheet, 90 ... Frame-shaped member, 101 ... Display device.

Claims (22)

Display panel and
A light emitting device arranged on the back side of the display panel is provided.
The light emitting device is
Each has a light source and a wavelength conversion member, the wavelength conversion member converts the wavelength of light emitted from the light source, and the wavelength conversion member has a wavelength conversion material including a quantum dot, and the quantum. The dots are composed of a plurality of light emitting parts in a resin having an axis of 1 nanometer to 100 nanometer and arranged so as to receive the light.
An optical component having a light incident surface facing the plurality of light emitting portions, having a light emitting surface facing the back surface of the display panel and perpendicular to the light incident surface, and the light emitting surface is a light emitting surface. Optical components with an uneven pattern,
It is a preventive structure for suppressing light from entering from the first light emitting portion to the adjacent light emitting portion, and has a plurality of recesses, and each recess has a corresponding end of the plurality of light emitting portions. The prevention structure, which is configured in relation to the part,
A display device. The wavelength conversion substance is sealed in a tubular container.
The display device according to claim 1. The prevention structure includes a wavelength conversion unit between the wavelength conversion members adjacent to each other, and the wavelength conversion unit is a wavelength conversion film that covers each end of the containers adjacent to each other and contains a fluorescent material.
The display device according to claim 2. The uneven pattern of the optical component has a convex portion.
The display device according to claim 3. Display panel and
A light emitting device arranged on the back side of the display panel is provided.
The light emitting device is
A light source and a wavelength conversion member, the wavelength conversion member converts the wavelength of light emitted from the light source, the wavelength conversion member has a wavelength conversion material including a quantum dot, and the quantum dot is a light source and a wavelength conversion member. A light source and a wavelength conversion member in a resin having an axis of 1 to 100 nanometers and arranged to receive the light.
An optical component having a light incident surface facing the light source and having a light emitting surface facing the back surface of the display panel.
With at least one light source substrate supporting the light source,
It is a preventive structure having one or more recesses, which is arranged with respect to the first light source and the related first wavelength conversion member, and suppresses the light from the first light source from being absorbed by the adjacent conversion member region. , Prevention structure,
A display device. The light emitting surface has an uneven pattern.
The display device according to claim 5. The uneven pattern of the optical component has a convex portion.
The display device according to claim 6. The light source is a light emitting diode that produces blue light.
The display device according to claim 5. The at least one light source substrate has a wiring pattern.
The display device according to claim 5. The optical component is a waveguide.
The display device according to claim 5. Each is a plurality of light emitting units having a light source and a wavelength conversion member, each of the light sources is configured to emit light in the first wavelength range, and each of the wavelength conversion members has a wavelength conversion material. Together with, the wavelength conversion material is configured to convert the emitted light in the first wavelength range, the wavelength conversion material is a particle in a resin having an axis of 1 nanometer to 100 nanometer and arranged to receive the light. With multiple light emitting parts, including
A light guide component having a light incident surface facing the plurality of light emitting portions,
A preventive structure configured to prevent the emitted light in the first wavelength range from entering the light guide component.
With
The prevention structure has a wavelength conversion unit arranged between at least a pair of adjacent wavelength conversion members, and the wavelength conversion member faces away from each corresponding end of the adjacent wavelength conversion member. The prevention structure has a plurality of circular recesses, each recess associated with one corresponding end of the adjacent wavelength conversion member.
Light emitting device. The prevention structure absorbs the emitted light in the first wavelength range directly toward the light guide component.
The light emitting device according to claim 11. The prevention structure is a color unevenness prevention structure including the wavelength conversion unit.
The light emitting device according to claim 12. The prevention structure includes a wavelength conversion film containing a fluorescent paint.
The light emitting device according to claim 12. The wavelength conversion member has quantum dots.
The light emitting device according to claim 12. The light guide component is a light guide plate.
The light incident surface is an end surface of the light guide plate.
The light emitting device according to claim 12. The light source is a light source of blue light.
The light emitting device according to claim 12. The light source is an LED.
The light emitting device according to claim 12. Each of the wavelength conversion members is sealed in a tubular container.
The light emitting device according to claim 12. Each of the tubular containers is made of glass.
The light emitting device according to claim 19. The wavelength conversion member absorbs blue light emitted from the light source, converts a part of the blue light into light in the range of red light or green light, and thus emits light from the light source. Passes through the wavelength conversion member, wherein the wavelength conversion member synthesizes light in a given red light range, light in a given green light range, and light in a given blue light range. And was configured to produce white light,
The light emitting device according to claim 12. The range of the red light is a wavelength range of about 620 nm to about 750 nm, and the range of the green light is a wavelength range of about 495 nm to about 570 nm.
The light emitting device according to claim 21.

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