Illumination device and display device

Abstract

Emission light of a light source is uniformly distributed. An illumination device (30) is provided with a light source (52) having a first light source element (61) and a second light source element (62), and a reflection member (70) disposed so as to surround the light source (52) with a first direction (L1) as an axis, the reflection member (70) reflecting light emitted from the light source (52) toward the first direction (L1), and the light source (52) having the first light source element (61) and the second light source element (62). The first light source element (61) and the second light source element (62) are arranged in the order of the first light source element (61) and the second light source element (62) in the first direction (L1).

Description

Technical Field

[0001] The present technology relates to lighting devices and display devices. Background Art

[0002] There is known a lighting device including two light source elements having different emission wavelengths. For example, the light-emitting device (lighting device) described in Patent Document 1 includes a substrate, a plurality of white LEDs arranged linearly on the substrate, and a plurality of infrared LEDs, and the white LEDs and the infrared LEDs are arranged alternately. According to Patent Document 1, it is described that with such a configuration, the photometric deviation of white light and infrared light in the column direction (linear direction) becomes smaller, and the uniformity of the emission intensity can be improved. Prior Art Documents Patent Documents

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2010-287871 Summary of the Invention Problems to be Solved by the Invention

[0004] In the case of a lighting device in which two types of light source elements are arranged alternately in a line, the emitted light emitted in the arrangement direction of the LEDs is blocked by other types of adjacent LEDs. Since the blocked emitted light does not exit to the outside of the lighting device, the distribution of the light emitted from the lighting device may become uneven.

[0005] The present technology has been completed based on the above circumstances, and an object thereof is to provide a lighting device capable of more uniformly distributing and emitting the emitted light of each light source element in a lighting device having two types of light source elements. Means for Solving the Problems

[0006] (1) The lighting device includes a light source and a reflection member, the reflection member is arranged so as to surround the light source with a first direction as an axis, and reflects the emitted light of the light source toward the first direction side, the light source includes a first light source element and a second light source element, and the first light source element and the second light source element are arranged in the first direction in the order of the first light source element and the second light source element.

[0007] Assume that when the second light source element is located between the first light source element and the reflection member, a part of the emitted light from the first light source element toward the reflection member is blocked by the second light source element. Since a part of the emitted light does not reach the reflection member, the distribution of the reflected light from the first light source element becomes uneven.

[0008] In the configuration of the present invention, the second light source element is arranged at a position offset in the first direction with respect to the first light source element. Therefore, the light emitted from the first light source element towards the reflection member reaches the reflection member without being blocked by the second light source element and is reflected towards the first direction side. Since the light emitted from the first light source element is not blocked by the second light source element, the reflected light from the reflection member towards the first direction side can be evenly distributed.

[0009] (2) In the lighting device described in the above (1), it may also be that the second light source element is mounted on the first light source element. In this way, the mounting area of the light source element can be reduced, and the light source can be miniaturized.

[0010] (3) In the lighting device described in the above (1) or (2), it may also be that the emission wavelength of the second light source element is different from the emission wavelength of the first light source element. In this way, lights of different wavelengths can be evenly distributed separately.

[0011] (4) In the lighting device described in any one of the above (1) to (3), it may also be that the light source may have a housing portion for housing the first light source element and the second light source element, and the housing portion may be filled with a phosphor that performs wavelength conversion on the emitted light of at least one of the first light source element and the second light source element.

[0012] In this way, through the phosphor, the wavelength of the light emitted by one or two light source elements can be converted and emitted.

[0013] (5) In the lighting device described in the above (4), it may also be that the first light source element is a blue LED that emits blue light, the second light source element is an infrared LED that emits infrared light, and the phosphor converts the blue light into white light.

[0014] In this way, after converting the blue light into white light and emitting it, the infrared light is directly emitted as infrared light. Both visible light (white light) and invisible light (infrared light) can be emitted.

[0015] (6) In the lighting device described in the above (1) to (5), it may also be that a reflection layer for reflecting light is provided between the first light source element and the second light source element.

[0016] In this way, the light emitted from the first light source element towards the first direction is reflected by the reflection layer. The reflected light changes direction and is emitted from the light source to the outside. Among the light emitted from the first light source element, the light blocked by the second light source element is reduced, and the light that can be emitted to the outside of the light source increases. Thereby, the light of the first light source element can be effectively utilized. Advantages of the Invention

[0017] According to the technology described in the specification of the present application, in a lighting device having two light source elements, the light emission of each light source element can be more evenly distributed and emitted. Description of the Drawings

[0018] Figure 1 It is a side view showing the installation mode of the liquid crystal display device of the first embodiment. Figure 2 It is an exploded perspective view of the liquid crystal display device of the first embodiment. Figure 3 It is a sectional view taken along line I-I of the liquid crystal display device of the first embodiment. Figure 4 It is a sectional view of the multi-chip LED of the first embodiment. Figure 5 It is a top view of the multi-chip LED of the first embodiment. Figure 6 It is a bottom view of the multi-chip LED of the first embodiment. Figure 7 It is a diagram showing the distribution of the emitted light of the lighting device of the first embodiment. Figure 8 It is a sectional view of the multi-chip LED of the second embodiment. Figure 9 It is a diagram showing the distribution of the emitted light in the lighting device of the existing configuration. Detailed Embodiments

[0019] <First Embodiment> Refer to Figures 1 to 7 The first embodiment of the present invention will be described. In the present invention, a liquid crystal display device 10 (an example of a "display device") for a dashboard mounted on an automobile is exemplified. The X-axis, Y-axis, and Z-axis are shown in some of the drawings, and the directions of each axis are depicted as the same directions in each drawing.

[0020] 1. Overall Configuration As Figure 1 shown, the liquid crystal display device 10 of the present embodiment is provided in front of the driver's seat in the dashboard DB of the automobile. The liquid crystal display device 10 emits two types of light, visible light VL and invisible infrared light IR, to the driver D. The visible light VL is light for the driver D to view the display content (various gauges or warnings) of the liquid crystal panel 20 described later. The invisible infrared light IR is light irradiated to the driver D in order to recognize the expression and eye movement of the driver (for example, to prevent drowsy driving, etc.). In addition, the recognition of the expression and eye movement of the driver D is performed by an infrared camera provided separately.

[0021] As Figure 2As shown, the liquid crystal display device 10 includes: a liquid crystal panel 20 (an example of an irradiated object) as a display panel; and a backlight device 30 (an example of an illumination device) that irradiates light onto the liquid crystal panel 20. These components are integrally held by a frame-shaped bezel 40 and the like. The bezel 40 extends along the peripheral portion on the front side of the liquid crystal panel 20 and constitutes the appearance of the front side of the liquid crystal display device 10. The bezel 40 is made of metal or resin with excellent rigidity.

[0022] The liquid crystal panel 20 is assembled to the bezel 40 with the display surface capable of displaying an image facing the front side. The entire liquid crystal panel 20 is horizontally long and rectangular. The liquid crystal panel 20 is composed of a pair of transparent (high light-transmissive) glass substrates bonded with a predetermined gap therebetween, and a liquid crystal layer is sealed between the two glass substrates.

[0023] On one glass substrate, a switching element (e.g., TFT) connected to source wirings and gate wirings orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, etc. are provided. On the other glass substrate, a color filter in which coloring portions such as R (red), G (green), and B (blue) are arranged in a predetermined pattern, a counter electrode, an alignment film, etc. are provided.

[0024] Among them, image data and various control signals required for displaying an image are supplied from a drive circuit board (not shown) to the source wirings, gate wirings, counter electrode, etc. It should be noted that polarizing plates (not shown) are arranged outside the two glass substrates.

[0025] As Figure 2 As shown, the backlight device 30 includes: a substantially box-shaped base 31 that opens toward the light-emitting side (the liquid crystal panel 20 side); a diffusion plate 34 disposed so as to cover the opening of the base 31; an optical sheet 33 that imparts a predetermined optical effect to the light emitted from the diffusion plate 34; and a frame 15 disposed along the outer peripheral portion of the base 31 and clamping and holding the outer peripheral portions of the diffusion plate 34 and the optical sheet 33 between the base 31.

[0026] In the base 31, a multi-chip LED 52 (an example of a light source) disposed in a relative manner directly below the diffusion plate 34, a mounting substrate 51 on which the multi-chip LED 52 is mounted, and a sheet-like reflection member 70 that reflects the light in the base 31 toward the diffusion plate 34 side are housed. In this way, the backlight device 30 of the present embodiment is a so-called direct-lit type backlight device in which the multi-chip LED 52 is disposed opposite to the lower side (back side) of the liquid crystal panel 20.

[0027] The base 31 is made of metal, as Figure 2As shown, it is generally a shallow, roughly box-shaped structure that opens towards the front side. The base 31 has a horizontally long rectangular bottom 31A similar to the liquid crystal panel 20, and side portions 31B that stand upright from the outer ends of each side of the bottom 31A towards the front side. Substrates such as a control substrate that supplies drive signals to the liquid crystal panel 20 are mounted on the outer back side of the bottom 31A.

[0028] The multi-chip LEDs 52 are mounted on the surface of the plate-shaped mounting substrate 51 that faces the liquid crystal panel 20 (hereinafter referred to as the mounting surface) among a pair of surfaces. As Figure 2 shown, a plurality of multi-chip LEDs 5 are arranged in a row and column pattern (matrix pattern) at substantially equal intervals in the X-axis direction (row direction) and the Y-axis direction (column direction), respectively. The direction of the liquid crystal panel 20 as observed from the multi-chip LED 52 is set as the first direction L1 (refer to Figure 3 ). In the present embodiment, the first direction L1 is the normal direction of the liquid crystal panel 20 and is parallel to the Z-axis.

[0029] The plurality of multi-chip LEDs 52 are electrically connected to each other through a wiring pattern formed of a metal film in the plane of the mounting surface. The base material of the mounting substrate 51 is made of a metal such as aluminum, and a wiring pattern is formed on its surface with an insulating layer interposed therebetween. Electric power is supplied to the multi-chip LEDs 52 through the wiring pattern, and the multi-chip LEDs 52 emit light. As the material for the base material of the mounting substrate 51, an insulating material such as a synthetic resin can also be used. The detailed structure of the multi-chip LED 52 will be described later.

[0030] As Figure 2 and Figure 3 shown, the reflection member 70 includes an insertion hole 72, side wall portions 73, and a bottom wall portion 74. Each of the plurality of multi-chip LEDs 52 is inserted into one insertion hole 72. The side wall portions 73 are formed to surround each of the multi-chip LEDs 52 inserted through the insertion holes 72. The bottom wall portion 74 is located between the insertion hole 72 and the side wall portions 73 and is formed along the mounting substrate 51.

[0031] The side wall portions 73 are composed of four inclined surfaces 73A that project obliquely towards the front side from the mounting substrate 51 side. The four trapezoidal inclined surfaces 73A surround one multi-chip LED 52 in an inverted quadrangular pyramid shape to form each side wall portion 73. The four trapezoidal inclined surfaces 73A individually surround each multi-chip LED 52 in an inverted quadrangular pyramid shape.

[0032] Through the inclined surfaces 73A, the light emitted from each multi-chip LED 52 and reaching the inclined surfaces 73A is reflected towards the first direction L1 side (front side, liquid crystal panel 20 side). By adjusting the angle of the inclined surfaces 73A of the side wall portions 73 according to the orientation characteristics of the multi-chip LED 52 where the intensity of the emitted light is at a peak, it is possible to adjust the degree of pointing towards the first direction L1 side, etc.

[0033] In this embodiment, the multi-chip LEDs 52 are arranged at a certain interval, and the side wall portions 73 surrounding each of the plurality of multi-chip LEDs 52 are equal in size. The light emitted from the multi-chip LEDs 52 is directed toward the liquid crystal panel 20 side through the inclined surface 73A of the side wall portion 73.

[0034] Here, "reflecting in a direction toward the first direction side (reflecting toward the first direction side)" not only refers to the case where the reflected light is parallel to the first direction L1, but also includes the case where the component of the reflected light in the first direction L1 is increased compared to before reflection. Specifically, as Figure 7 shown, the emitted light S1 of the multi-chip LED 52 is reflected by the reflecting member 70 to change its direction, and the reflected light R1 is incident on the liquid crystal panel 20. The reflected light R1 may not be incident on the liquid crystal panel 20 perpendicularly, but the component of the reflected light R1 in the first direction L1 is larger than that of the emitted light S1 before reflection. Such reflection is included in "reflecting toward the first direction side".

[0035] 2. Structure of Multi-chip LED The liquid crystal display device 10 is a display device capable of emitting both visible light VL and infrared light IR to the driver D (refer to Figure 1 ). The multi-chip LED 52 used in this liquid crystal display device 10 emits two types of light, namely visible light (white light) and infrared light. Refer to Figure 4 Figure 7 to describe the structure of such a multi-chip LED 52.

[0036] As Figure 4 , Figure 5 shown, the multi-chip LED 52 has two light source elements (a first light source element 61 and a second light source element 62). The first light source element 61 emits an LED lamp that emits blue light. The second light source element 62 is an LED chip that emits a wavelength different from the blue light of the first light source element 61 (infrared light in this embodiment).

[0037] The multi-chip LED 52 includes: a housing portion 63 that houses the two light source elements 61 and 62; and a sealing portion 67 that is filled in the housing portion 63 and seals the two light source elements 61 and 62 in the housing portion 63. The housing portion 63 is a so-called package and has a box-shaped shape that opens in the direction of the liquid crystal panel 20.

[0038] The housing portion 63 has: a bottom surface portion 63A that is parallel to the plate surface of the mounting substrate 51; and side surface portions 63B that extend from the periphery of the bottom surface portion 63A in the Z-axis direction. The entire housing portion 63 is made of a transparent (high light-transmissive) resin and transmits visible light and infrared light.

[0039] Inside the storage part 63, four internal electrodes (two internal electrodes 64A and two internal electrodes 64B) are formed on the bottom surface part 63A. The two internal electrodes 64B are formed at positions near the side surface part 63B (near the outer edge) of the bottom surface part 63A. The two internal electrodes 64A are formed inside the internal electrodes 64B (near the center of the bottom surface part 63A).

[0040] As Figure 6 shown, four external electrodes (two external electrodes 65A and two external electrodes 65B) are formed on the surface of the bottom surface part 63A that faces the mounting substrate 51. Through the wiring formed in the storage part 63, the internal electrode 64A and the external electrode 65A, and the internal electrode 64B and the external electrode 65B are electrically connected to each other one by one. The internal electrodes 64A and 64B and the external electrodes 65A and 65B are formed by performing silver plating treatment or the like on the surface of the storage part 63.

[0041] 2.1 First light source element As Figure 4 shown, the first light source element 61 is substantially plate-shaped or substantially rectangular parallelepiped-shaped, and has: a first surface 61A; and a second surface 61B opposite to the first surface 61A. The first surface 61A faces the bottom surface part 63A side, and the second surface 61B faces the second light source element 62 and the liquid crystal panel 20 side. An anode electrode and a cathode electrode are formed on the first surface 61A.

[0042] The first light source element 61 is mounted on the storage part 63 with the first surface 61A facing the bottom surface part 63A. The two internal electrodes 64A formed on the bottom surface part 63A are electrically connected to the anode electrode and the cathode electrode formed on the first surface 61A of the first light source element 61 through a conductive adhesive or the like. By appropriately applying a voltage to the external electrode 65A, electric power is supplied to the first light source element 61 via the internal electrode 64A, and the first light source element 61 emits blue light.

[0043] 2.2 Second light source element The second light source element 62 is placed on the surface of the first light source element 61 that faces the liquid crystal panel 20 side, that is, the second surface 61B. The first light source element 61 and the second light source element 62 are arranged and configured in the order of the first light source element 61 and the second light source element 62 in the first direction L1. The second light source element 62 is substantially plate-shaped or substantially rectangular parallelepiped-shaped, and has a substantially flat first surface 62A and a second surface 62B as a pair of plate surfaces.

[0044] The first surface 62A is the surface opposite to the second surface 61B of the first light source element 61. The second light source element 62 is fixed to the second surface 61B through an adhesive or the like so as not to shift in position relative to the first light source element 61.

[0045] An anode electrode and a cathode electrode are formed on the second surface 62B, and each electrode is electrically connected to the internal electrode 64B through a lead wire 66. By applying a voltage to the external electrode 65B (refer to Figure 6 ), electric power is supplied to the second light source element 62 via the internal electrode 64B, and the second light source element 62 emits light in the infrared wavelength region.

[0046] The emitted light directly or is reflected by the reflecting member 70 and is directed toward the liquid crystal panel 20, and the infrared light IR transmitted through the liquid crystal panel 20 irradiates the driver D (refer to Figure 1 ).

[0047] 2.3 Sealing portion As Figure 4 shown, the sealing portion 67 has a resin material with excellent light transmissibility and a phosphor 67A mixed in the resin material at a prescribed distribution concentration. The phosphor 67A wavelength-converts a part of the blue light emitted by the first light source element 61. The phosphor 67A includes a green phosphor that converts blue light into green light in the green wavelength region and a red phosphor that wavelength-converts blue light into red light in the red wavelength region.

[0048] During the blue light emitted by the first light source element 61 passing through the sealing portion 67, a part of it is converted into green light and a part is converted into red light by the phosphor 67A. The green light and the red light are mixed with the original blue light to form white light, and the multi-chip LED 52 emits white light.

[0049] In addition, the phosphor 67A does not affect the emitted light in the infrared region wavelength emitted by the second light source element 62. The light emitted by the second light source element 62 is emitted to the outside of the multi-chip LED 52 in the state of the wavelength (infrared) at the time of light emission.

[0050] 2.4 Light distribution characteristics of white light The first light source element 61 emits light from each surface except the first surface 61A facing the mounting surface, and has a light distribution characteristic in which the emitted light expands radially from each surface. In the configuration of the present embodiment, as Figure 7 shown, a second light source element 62 is provided on the second surface 61B (the surface on the liquid crystal panel 20 side) of the first light source element 61. The second light source element 62 does not transmit the blue light of the first light source element 61. Therefore, most of the emitted light emitted from the second surface 61B of the first light source element 61 is blocked by the second light source element 62.

[0051] The emitted light from the side surfaces (surfaces other than the first surface 61A and the second surface 61B) of the first light source element 61 radiates radially from their respective surfaces, and most of the emitted light is incident on the side wall portion 73. The light directly incident on the liquid crystal panel 20 among the emitted light from each surface of the first light source element 61 is very little, and most of it is incident on the side wall portion 73.

[0052] As Figure 7 shown, most of the light emitted by the first light source element 61 has light components perpendicular to the first direction L1 ( Figure 7 the left - right direction in []) as the outgoing light S1 and is emitted to the outside of the multi - chip LED 52. The outgoing light S1 is white light wavelength - converted by the phosphor 67A. The outgoing light S1 does not directly enter the liquid crystal panel 20 but enters the side wall portion 73.

[0053] After the outgoing light S1 enters the side wall portion 73, it is reflected by the side wall portion 73, changes its orientation, and becomes the reflected light R1. The component of the reflected light R1 in the first direction L1 is larger than that of the outgoing light S1, and the reflected light R1 enters the liquid crystal panel 20.

[0054] Here, for comparison, a backlight device 130 having a configuration different from that of the present embodiment will be described. In Figure 9 the backlight device 130, two chip LEDs, the first chip LED 152 and the second chip LED 153, are both mounted on the mounting substrate 51. The first chip LED 152 and the second chip LED 153 are arranged at intervals on the same mounting surface.

[0055] The first light source element 161 (blue LED) of the first chip LED 152 and the second light source element 162 (infrared LED) of the second chip LED 153 are elements that emit light at different wavelengths respectively. Each light source element 161, 162 does not transmit light. The light emitted from the first light source element 161 is wavelength - converted by the phosphor 67A, and the light emitted from the first chip LED 152 is white light.

[0056] Let the light emitted from the first light source element 161 be the outgoing lights S2, S3, S4. The outgoing light S2 is the outgoing light that reaches the reflection member 70. There is no object blocking the light on the optical path of the outgoing light S2, and the outgoing light S2 directly reaches the reflection member 70. The outgoing light S2 that reaches the reflection member 70 becomes the reflected light R2 reflected to the first direction L1 side, and the reflected light R2 enters the liquid crystal panel 20.

[0057] The outgoing light S3 is the outgoing light that directly enters the liquid crystal panel 20 after being emitted from the first light source element 161. There is no object blocking the optical path of the outgoing light S3 on the first direction L1 side of the first light source element 161, so the outgoing light S3 directly enters the liquid crystal panel 20.

[0058] The outgoing light S4 indicated by the double - dot dash line is the outgoing light whose optical path is blocked by the second light source element 162. The first light source element 161 and the second light source element 162 are mounted adjacent to each other on the mounting surface of the substrate 51. Between the first light source element 161 and Figure 9There is a second light source element 162 between the side wall portions 73 located on the right side of the first light source element 161. The light S4 emitted from the second light source element 162 toward the right side wall portion 73 is blocked by the second light source element 162 and does not reach the reflection member 70. Therefore, the reflected light R4 (represented by a dashed-dotted line because it does not actually reflect) does not enter the liquid crystal panel 20.

[0059] In Figure 9 the structure, the reflected light R2 and the emitted light S3 travel toward the first direction L1 side, enter the liquid crystal panel 20, and increase the brightness of the liquid crystal panel 20. However, the emitted light S4 is blocked by the second light source element 162, and the direction toward the first direction L1 side does not change, and it does not enter the liquid crystal panel 20. That is, although the emitted lights S2 and S4 are lights emitted from the same side, depending on the emission direction, a part is blocked, and the other part is reflected toward the liquid crystal panel 20.

[0060] Therefore, in the region corresponding to the optical path of the reflected light R4, the brightness of the liquid crystal panel 20 is lower than that of the periphery. In the backlight device 130, there is a problem that the distribution of white light in the liquid crystal panel 20 becomes uneven.

[0061] 3. Effects of the present embodiment (1) The backlight device 30 of the present embodiment includes the multi-chip LED 52 and the reflection member 70. The reflection member 70 is arranged to surround the multi-chip LED 52 with the first direction L1 as an axis, and reflects the emitted light S1 of the multi-chip LED 52 toward the first direction L1 side. The multi-chip LED 52 includes a first light source element 61 and a second light source element 62. The first light source element 61 and the second light source element 62 are arranged in the order of the first light source element 61 and the second light source element 62 in the first direction L1.

[0062] In the backlight device 30, the two light source elements 61 and 62 are arranged in the first direction L1. In other words, the second light source element 62 is arranged at a position shifted in the first direction L1 with respect to the first light source element 61. Thus, the emitted light S1 from the first light source element 61 toward the reflection member 70 reaches the reflection member 70 without being blocked by the second light source element 62 and is reflected toward the first direction L1 side.

[0063] In such a structure, the emitted light S1 from the first light source element 61 toward the reflection member 70 is not blocked by the second light source element 62 regardless of the emission direction. Thus, the reflected light R1 toward the first direction L1 side can be evenly distributed.

[0064] In addition, the second light source element 62 is arranged offset along the first direction L1 with respect to the first light source element 61. The light emitted by the second light source element 62 is directly emitted or reflected by the reflection member 70 without being blocked by the first light source element 61, and is directed toward the first direction L1 side. The light emitted by the second light source element 62 will not be blocked by another light source element (the first light source element 61), so the distribution will not be uneven.

[0065] In the configuration of the present embodiment, the light emitted by the first light source element 61 and the light emitted by the second light source element 62 can be evenly distributed toward the first direction L1 side.

[0066] (2) In the backlight device 30, the second light source element 62 is mounted on the first light source element 61. In this way, compared with the case where two light source elements 61 and 62 are separately mounted, the mounting area can be reduced and the multi-chip LED 52 can be miniaturized.

[0067] (3) In the backlight device 30, the emission wavelengths of the first light source element 61 and the second light source element 62 are different wavelengths. In this way, the backlight device 30 can evenly distribute lights of different wavelengths separately.

[0068] (4) The multi-chip LED 52 has a housing portion 63 that houses the first light source element 61 and the second light source element 62, and the housing portion 63 is filled with a phosphor 67A that wavelength-converts the emitted light S1 of the first light source element 61. In this way, the emitted light of the first light source element 61 can be wavelength-converted, and the light with such a wavelength is emitted as the emitted light S1.

[0069] (5) The first light source element 61 is a blue LED that emits blue light, the second light source element 62 is an infrared LED that emits infrared light, and the phosphor 67A wavelength-converts the blue light into white light. In this way, both white light that can be visually recognized and discriminated in terms of color and infrared light, which is invisible light that cannot be visually recognized, can be emitted.

[0070] <Second Embodiment> Figure 8 The configuration of the multi-chip LED 252 applicable to the lighting device of the second embodiment is shown. In the lighting device of the second embodiment, the difference from the first embodiment is that a reflection layer 68 is provided between the first light source element 261 and the second light source element 262 of the multi-chip LED 252. In the second embodiment, for the same configurations, operations, and effects as those of the first embodiment, repeated descriptions are omitted.

[0071] As Figure 8As shown, the multi-chip LED 252 has a reflective layer 68 between the first light source element 261 and the second light source element 262. The reflective layer 68 is formed of, for example, a white resin plate with a high reflectivity for white light. It is provided between the second surface 261B of the first light source element 261 and the first surface 262A of the second light source element 262. The material of the reflective layer 68 is not limited to resin, and can also be a mirror-like metal plate, a resin plate plated with metal, a metal coating, etc.

[0072] Among the light emitted by the first light source element 261, the emitted light S5 emitted from the second surface 261B is reflected by the reflective layer 68 and changes its direction, and is emitted from the side of the first light source element 261 as the reflected light R5. The reflected light R5 passes through the accommodating portion 63 and is emitted to the outside of the multi-chip LED 252, and then is reflected by the reflecting member 70 and is incident on the liquid crystal panel 20 toward the first direction L1 side.

[0073] In the configuration of the second embodiment, the direction of the emitted light S5 emitted from the first light source element 261 toward the first direction L1 side can be changed so as to be emitted to the outside of the multi-chip LED 252. In this way, the light in the emitted light of the first light source element 261 that is blocked by the second light source element 262 and cannot be emitted to the outside can be reduced, and more light can be emitted to the outside. As a result, the emitted light of the first light source element 261 can be utilized more effectively.

[0074] <Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention.

[0075] (1) The second light source element 62 may not be mounted on the first light source element 61. The first light source element 61 and the second light source element 62 only need to be arranged in sequence along the first direction L1.

[0076] (2) The emission wavelengths of the first light source element 61 and the second light source element 62 may be different or the same. In the case of being the same, the intensity of the irradiated light can be further increased.

[0077] (3) In the accommodating portion 63 of the multi-chip LED 52, the phosphor 67A may not be filled.

[0078] (4) The first light source element 61 is not limited to a blue LED, and the second light source element 62 is not limited to an infrared LED. LEDs with any emission wavelength can be applied.

[0079] (5) In the above embodiments, the case where the liquid crystal panel 20 is square (rectangular) is illustrated, but it is not limited to being square. It may be a shape with a circular or elliptical curve as the contour line, or a shape formed by combining a curve and a straight line.

[0080] (6) Although the case where the first light source element 61 and the second light source element 62 are semiconductor LED chips is illustrated, each light source element may also be other light source elements such as an organic EL.

[0081] (7) In the above-described embodiment, the case where the first direction L1 is perpendicular to the display surface of the liquid crystal panel 20 is illustrated, but the first direction L1 may also be inclined with respect to the display surface of the liquid crystal panel 20. Explanation of reference numerals

[0082] 10: Liquid crystal display device, 20: Liquid crystal panel, 30: Backlight device (an example of a lighting device), 52: Multi-chip LED (an example of a light source), 61: First light source element, 62: Second light source element, 63: Storage portion, 67A: Phosphor, 70: Reflection member, 73: Side wall portion, S1: Emitted light, R1: Reflected light

Claims

1. A lighting device, characterized in that: A light source and a reflective component are provided. The reflecting component is arranged around the light source with the first direction as an axis, and reflects the emitted light of the light source toward the first direction. The light source comprises a first light source element and a second light source element, The first light source element and the second light source element are arranged in the first direction in the order of the first light source element and the second light source element.

2. The lighting device according to claim 1, characterized in that: The second light source element is mounted on the first light source element.

3. The lighting device according to claim 1, characterized in that: The light emission wavelength of the second light source element is different from the light emission wavelength of the first light source element.

4. The lighting device according to claim 1, characterized in that: The light source includes a housing portion for housing the first light source element and the second light source element. The housing portion is filled with a fluorescent substance that converts the wavelength of light emitted from at least one of the first light source element and the second light source element.

5. The lighting device according to claim 4, characterized in that: The first light source element is a blue LED that emits blue light, the second light source element is an infrared LED that emits infrared light, and the phosphor converts the blue light into white light.

6. The lighting device according to claim 1, characterized in that: A reflective layer that reflects light is provided between the first light source element and the second light source element.

7. A display device, characterized in that: have: The lighting device according to any one of claims 1 to 6; and A display panel displays pixels using the light irradiated from the illumination device.

8. The display device according to claim 7, characterized in that: The display panel is composed of a liquid crystal panel.

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