Lighting device and display device

Abstract

To evenly distribute emission light from a light source.SOLUTION: A lighting device 30 includes: a light source 52; and a reflection member 70 disposed so as to surround the light source 52 around an axis extending in a first direction L1 to reflect emitted light S1 from the light source 52 toward a side of the first direction L1. The light source 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 to the second light source element 62 in the first direction L1.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present technology relates to a lighting device and a display device.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

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 linearly arranged alternately, the emitted light emitted in the arrangement direction of the LEDs is blocked by the adjacent other type of LEDs. There is a concern that the blocked emitted light is not emitted to the outside of the lighting device, and the distribution of the light emitted from the lighting device becomes non-uniform.

[0005] The present technology has been completed based on the above circumstances, and an object thereof is to provide a lighting device having two types of light source elements, which can emit the emitted light of each light source element more uniformly distributed.

Means for Solving the Problems

[0006] (1) The lighting device includes a light source and a reflecting member that surrounds and arranges the light source around an axis with a first direction as the axis, and reflects the emitted light of the light source toward the first direction side. The light source has 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 order of the first light source element and the second light source element in the first direction.

[0007] If the second light source element is located between the first light source element and the reflecting member, a part of the emitted light from the first light source element toward the reflecting member is blocked by the second light source element. Since a part of the emitted light does not reach the reflecting member, the distribution of the reflected light derived from the first light source element becomes non-uniform.

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

[0009] (2) In the lighting device according to (1) above, the second light source element may be mounted on the first light source element. By doing so, the mounting area of the light source element can be reduced and the light source can be miniaturized.

[0010] (3) In the lighting device according to (1) or (2) above, the emission wavelength of the second light source element may be different from the emission wavelength of the first light source element. By doing so, lights of different wavelengths can be uniformly distributed respectively.

[0011] (4) In the lighting device according to any one of (1) to (3) above, the light source has a housing portion that houses the first light source element and the second light source element, and the housing portion may be filled with a phosphor that wavelength-converts the emitted light of at least one of the first light source element and the second light source element.

[0012] In this way, the phosphor can convert the emitted light of one or both of the light source elements and emit the converted light.

[0013] (5) In the lighting device according to (4) above, 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 may convert the blue light into white light.

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

[0015] (6) The lighting device according to (1) to (5) above may include a reflective layer that reflects light 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 in the first direction is reflected by the reflective layer. The reflected light changes its direction and is emitted from the light source to the outside. Among the emitted light of 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 is increased. Thereby, the light of the first light source element can be used efficiently.

Advantages of the Invention

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

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0019] <Embodiment 1> Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 7. In the present invention, a liquid crystal display device 10 (an example of a "display device") for a meter panel mounted on an automobile will be exemplified. In some of the drawings, the X-axis, Y-axis, and Z-axis are shown, and the directions of the respective axes are drawn so as to be common in each drawing.

[0020] 1. Overall configuration As shown in FIG. 1, the liquid crystal display device 10 according to the present embodiment is installed in front of the driver's seat on 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, toward the driver D. The visible light VL is light for allowing the driver D to visually recognize the display contents (various meters and warnings) of the liquid crystal panel 20 described later. The invisible infrared light IR is light irradiated toward the driver D for recognizing the expression and eye movement of the driver, for example, for the purpose of preventing drowsy driving. Note that the recognition of the expression and eye movement of the driver D is performed by a separately provided infrared camera.

[0021] As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 20 (an example of an irradiated object), which is a display panel, and a backlight device 30 (an example of an illumination device) that irradiates the liquid crystal panel 20 with light. These are integrally held by a bezel 40 or the like having a frame shape. The bezel 40 extends along the peripheral portion on the front side of the liquid crystal panel 20 and constitutes the appearance on 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 in a posture where the display surface capable of displaying an image faces the front side. The liquid crystal panel 20 has an overall horizontally long rectangular shape (rectangular shape). The liquid crystal panel 20 is configured such that a pair of transparent (having high light transmittance) glass substrates are bonded together with a predetermined gap therebetween, and a liquid crystal layer is enclosed between the two glass substrates.

[0023] On one glass substrate, a switching element (for example, a TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, and further an alignment film and the like are provided. On the other glass substrate, a color filter, a counter electrode, and further an alignment film and the like in which each coloring portion such as R (red), G (green), and B (blue) are arranged in a predetermined array are provided.

[0024] Among these, image data and various control signals necessary for displaying an image are supplied to the source wiring, the gate wiring, the counter electrode, and the like from a drive circuit board (not shown). Note that polarizing plates (not shown) are arranged outside both glass substrates.

[0025] As shown in FIG. 2, the backlight device 30 includes a chassis 31 having a substantially box shape that opens toward the light emission side (the liquid crystal panel 20 side), a diffusion plate 34 arranged so as to cover the opening of the chassis 31, an optical sheet 33 that imparts a predetermined optical action to the light emitted from the diffusion plate 34, and a frame 15 arranged along the outer peripheral edge of the chassis 31 and sandwiching and holding the outer peripheral edge of the diffusion plate 34 and the outer peripheral edge of the optical sheet 33 between the chassis 31.

[0026] Inside the chassis 31, a multi-chip LED 52 (an example of a light source), a mounting substrate 51 on which the multi-chip LED 52 is mounted, and a sheet-like reflecting member 70 that reflects the light in the chassis 31 toward the diffusion plate 34 are accommodated. Thus, the backlight device 30 according to the present embodiment is a so-called direct-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 chassis 31 is made of metal and has a generally shallow, substantially box-shaped opening facing the front side as shown in FIG. 2. The chassis 31 has a bottom portion 31A having a horizontally long rectangular shape similar to the liquid crystal panel 20, and side portions 31B rising from the outer ends of the respective sides of the bottom portion 31A toward the front side. Substrates 32 such as a control substrate for supplying a drive signal to the liquid crystal panel 20 are attached to the outside of the back side of the bottom portion 31A.

[0028] The multi-chip LED 52 is mounted on the plate surface (hereinafter referred to as the mounting surface) facing the liquid crystal panel 20 among the pair of plate surfaces of the plate-like mounting substrate 51. As shown in FIG. 2, a plurality of multi-chip LEDs 52 are arranged in parallel in a matrix (matrix) at substantially equal intervals in the X-axis direction (row direction) and the Y-axis direction (column direction). The direction of the liquid crystal panel 20 as viewed from the multi-chip LED 52 is defined as the first direction L1 (see FIG. 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 by a wiring pattern made of a metal film formed by wiring in the plane of the mounting surface. The base material of the mounting substrate 51 is made of a metal such as aluminum, and the wiring pattern is formed on the surface via an insulating layer. Electric power is supplied to the multi-chip LED 52 through the wiring pattern, and the multi-chip LED 52 emits light. As the material used for the base material of the mounting substrate 51, an insulating material such as a synthetic resin can also be used. The detailed configuration of the multi-chip LED 52 will be described later.

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

[0031] The side wall portion 73 is composed of four inclined surfaces 73A that protrude obliquely from the mounting substrate 51 side toward the front side. The four trapezoidal inclined surfaces 73A surround one multi-chip LED 52 in an inverted square pyramid shape and form individual side wall portions 73. The four trapezoidal inclined surfaces 73A individually surround each multi-chip LED 52 in an inverted square pyramid shape.

[0032] The light emitted from each multi-chip LED 52 and reaching the inclined surface 73A is reflected so as to be directed toward the first direction L1 side (front side, liquid crystal panel 20 side). By adjusting the angle of the inclined surface 73A of the side wall portion 73 according to the orientation characteristics of the multi-chip LED 52 at which the intensity of the emitted light peaks, the degree of being directed toward the first direction L1 side and the like can be adjusted.

[0033] In the present embodiment, the multi-chip LEDs 52 are arranged at regular intervals, and the sizes of the side wall portions 73 surrounding each of the plurality of multi-chip LEDs 52 are equal. The light emitted from the multi-chip LEDs 52 is directed toward the liquid crystal panel 20 side by the inclined surfaces 73A of the side wall portions 73.

[0034] Here, "reflect so as to be directed toward the first direction (reflect toward the first direction)" does not only refer to the case where the reflected light is parallel to the first direction L1, but also includes the case where the first direction L1 component of the reflected light increases compared to before reflection. Specifically, as shown in FIG. 7, 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. Although the reflected light R1 may not be incident perpendicularly to the liquid crystal panel 20, the first direction L1 component of the reflected light R1 is larger than the emitted light S1 before reflection. Such reflection is included in "reflect toward the first direction".

[0035] 2. Configuration 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 toward the driver D (see FIG. 1). The multi-chip LED 52 used in this liquid crystal display device 10 emits two types of light, white light which is visible light and infrared light. The configuration of such a multi-chip LED 52 will be described with reference to FIGS. 4 to 7.

[0036] As shown in FIGS. 4 and 5, the multi-chip LED 52 has two light source elements (first light source element 61, second light source element 62). The first light source element 61 is an LED chip 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 shape that is open in the direction of the liquid crystal panel 20.

[0038] The housing portion 63 has a bottom surface portion 63A parallel to the plate surface of the mounting substrate 51, and side surface portions 63B formed by extending in the Z-axis direction from the periphery of the bottom surface portion 63A. The housing portion 63 is entirely made of a transparent (having high light transmittance) resin and transmits visible light and infrared light.

[0039] Inside the housing portion 63, on the bottom surface portion 63A, four internal electrodes (two internal electrodes 64A and two internal electrodes 64B) are formed. The two internal electrodes 64B are formed at positions on the bottom surface portion 63A closer to the side surface portion 63B (near the outer edge). The two internal electrodes 64A are formed more inward (near the center of the bottom surface portion 63A) than the internal electrodes 64B.

[0040] As shown in FIG. 6, on the surface of the bottom surface portion 63A facing the mounting substrate 51, four external electrodes (two external electrodes 65A and two external electrodes 65B) are formed. Through the wiring formed in the housing portion 63, the internal electrode 64A and the external electrode 65A, and the internal electrode 64B and the external electrode 65B are electrically connected in a one-to-one correspondence. The internal electrodes 64A, 64B and the external electrodes 65A, 65B are formed by, for example, silver-plating the surface of the housing portion 63.

[0041] 2.1 First light source element As shown in FIG. 4, 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 portion 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 housing portion 63 in a posture where the first surface 61A faces the bottom surface portion 63A. The two internal electrodes 64A formed on the bottom surface portion 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 by a conductive adhesive or the like. By appropriately applying power to the external electrode 65A, power is supplied to the first light source element 61 through 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 second surface 61B which is the surface of the first light source element 61 facing the liquid crystal panel 20 side. The first light source element 61 and the second light source element 62 are arranged side by side 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 a surface facing the second surface 61B of the first light source element 61. The second light source element 62 is fixed to the second surface 61B by an adhesive or the like so as not to be displaced with respect 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 an internal electrode 64B by a lead wire 66. By applying power to an external electrode 65B (see FIG. 6), 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 goes directly or is reflected by a reflecting member 70 toward the liquid crystal panel 20, and the infrared light IR transmitted through the liquid crystal panel 20 irradiates the driver D (see FIG. 1).

[0047] 2.3 Sealing portion As shown in FIG. 4, the sealing portion 67 has a resin material excellent in light transmittance and a phosphor 67A blended in the resin material at a predetermined 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] A part of the blue light emitted by the first light source element 61 is converted into green light and a part is converted into red light respectively while passing through the sealing portion 67 by the phosphor 67A. The green light and the red light are mixed with the original blue light to present white, and the multi-chip LED 52 emits white light.

[0049] Note that the phosphor 67A has no effect on the light emitted by the second light source element 62 with a wavelength in the infrared region. The light emitted by the second light source element 62 is emitted outside the multi-chip LED 52 as it is at the wavelength (infrared) at the time of emission.

[0050] 2.4 Light distribution characteristics of white light The first light source element 61 has a light distribution characteristic in which each surface except the first surface 61A facing the mounting surface emits light, and the emitted light spreads radially from each surface. In the configuration of the present embodiment, as shown in FIG. 7, the 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 light emitted from the second surface 61B among the light emitted from the first light source element 61 is blocked by the second light source element 62.

[0051] The light emitted from the side surfaces (surfaces other than the first surface 61A and the second surface 61B) of the first light source element 61 is emitted radially from each surface, and most of the emitted light is incident on the side wall portion 73. Among the light emitted from each surface of the first light source element 61, only a small amount of light is directly incident on the liquid crystal panel 20, and most of it is incident on the side wall portion 73.

[0052] As shown in FIG. 7, most of the light emitted from the first light source element 61 is emitted outside the multi-chip LED 52 as the emitted light S1, which has a component perpendicular to the first direction L1 (the left-right direction in FIG. 7). The emitted light S1 is white light wavelength-converted by the phosphor 67A. The emitted light S1 is not directly incident on the liquid crystal panel 20 but is incident on the side wall portion 73.

[0053] After the emitted light S1 is incident on the side wall portion 73, it is reflected by the side wall portion 73 and changes its direction to become the reflected light R1. The reflected light R1 has an increased component in the first direction L1 compared to the emitted light S1, and the reflected light R1 is incident on 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 the backlight device 130 of FIG. 9, two chip LEDs, a first chip LED 152 and a second chip LED 153, are both mounted on a mounting substrate 51. The first chip LED 152 and the second chip LED 153 are arranged at intervals on the same mounting surface.

[0055] A first light source element 161 (blue LED) included in the first chip LED 152 and a second light source element 162 (infrared LED) included in the second chip LED 153 are elements that emit light at different wavelengths. Each of the light source elements 161 and 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 emitted light S2, S3, and S4. The emitted light S2 is the emitted light that reaches the reflecting member 70. Since there is no object that blocks the light on the optical path of the emitted light S2, the emitted light S2 directly reaches the reflecting member 70. The emitted light S2 that has reached the reflecting member 70 becomes reflected light R2 that is reflected toward the first direction L1 side, and the reflected light R2 is incident on the liquid crystal panel 20.

[0057] The emitted light S3 is the emitted light that is directly incident on the liquid crystal panel 20 after being emitted from the first light source element 161. Since there is no object that blocks the optical path of the emitted light S3 on the first direction L1 side of the first light source element 161, the emitted light S3 is directly incident on the liquid crystal panel 20.

[0058] The emitted light S4 indicated by the dashed two-dot line is the emitted 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. The second light source element 162 exists between the first light source element 161 and the side wall portion 73 located on the right side of the first light source element 161 in FIG. 9. The emitted light S4 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 reflecting member 70. Therefore, the reflected light R4 (actually, since it does not reflect, it is indicated by a dashed two-dot line) is not incident on the liquid crystal panel 20.

[0059] In the configuration of FIG. 9, 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 does not change its direction toward the first direction L1 side and does not enter the liquid crystal panel 20. That is, although the emitted lights S2 and S4 are lights emitted from the same side surface, 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 becomes 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 non-uniform.

[0061] 3. Effects of the Present Embodiment (1) The backlight device 30 of the present embodiment includes a multi-chip LED 52 and a reflecting member 70 that surrounds and arranges the multi-chip LED 52 around an axis with the first direction L1 as the 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, and 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, two light source elements 61 and 62 are arranged side by side 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. As a result, the emitted light S1 from the first light source element 61 toward the reflecting member 70 reaches the reflecting 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 configuration, the emitted light S1 from the first light source element 61 toward the reflecting member 70 is not blocked by the second light source element 62 regardless of the emission direction. Thereby, the reflected light R1 toward the first direction L1 side can be uniformly distributed.

[0064] Note that the second light source element 62 is arranged shifted in the first direction L1 with respect to the first light source element 61. The light emitted from the second light source element 62 directly or is reflected by the reflecting member 70 without being blocked by the first light source element 61 and travels toward the first direction L1 side. Since the light emitted from the second light source element 62 is not blocked by the other light source element (the first light source element 61), the distribution does not become non-uniform.

[0065] In the configuration of this embodiment, both the light emitted from the first light source element 61 and the light emitted from the second light source element 62 can be uniformly 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. By doing so, the mounting area can be reduced compared to the case where the two light source elements 61 and 62 are individually mounted, and the multi-chip LED 52 can be miniaturized.

[0067] (3) In the backlight device 30, the emission wavelength of the first light source element 61 and the emission wavelength of the second light source element 62 are different wavelengths. By doing so, the backlight device 30 can uniformly distribute lights of different wavelengths respectively.

[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. By doing so, the light emitted from the first light source element 61 can be wavelength-converted, and the light having this wavelength can be 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 blue light into white light. By doing so, both white light that can be visually recognized and can distinguish colors, and infrared light that is invisible light that cannot be visually recognized can be emitted.

[0070] <Embodiment 2> The configuration of the multi-chip LED 252 applied to the lighting device according to Embodiment 2 is shown in FIG. 8. In the lighting device according to Embodiment 2, it is different from Embodiment 1 in that a reflective 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 Embodiment 2, redundant descriptions of the same configurations, operations, and effects as those in Embodiment 1 are omitted.

[0071] As shown in FIG. 8, the multi-chip LED 252 includes a reflective layer 68 between the first light source element 261 and the second light source element 262. The reflective layer 68 is made of, for example, a white resin plate having a high reflectance of 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 may also be a mirror-finished metal plate, a resin plate with metal plating, a metal plating layer, or the like.

[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 as reflected light R5 from the side surface of the first light source element 261. The reflected light R5 passes through the housing portion 63 and is emitted to the outside of the multi-chip LED 252, and then is reflected by the reflecting member 70 and enters the liquid crystal panel 20 toward the first direction L1 side.

[0073] In the configuration of Embodiment 2, the direction of the emitted light S5 emitted from the first light source element 261 toward the first direction L1 side can be changed and emitted to the outside of the multi-chip LED 252. By doing so, among the emitted light of the first light source element 261, the light blocked by the second light source element 262 and unable to be emitted to the outside can be reduced, and more light can be emitted to the outside. Thereby, the light emitted by the first light source element 261 can be utilized more efficiently.

[0074] <Other Embodiments> The present invention is not limited to the embodiments described by the above description and 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 does not have to be mounted on the first light source element 61. It is sufficient that the first light source element 61 and the second light source element 62 are arranged in this order 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 increased more.

[0077] (3) The housing portion 63 of the multi-chip LED 52 does not have to be filled with the phosphor 67A.

[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 arbitrary emission wavelengths can be applied.

[0079] (5) In the above embodiment, the case where the liquid crystal panel 20 is rectangular (square) is exemplified, but it is not limited to a rectangular shape. A shape having a curve such as a circular shape or an elliptical shape as a contour line may be used, or a shape combining a curve and a straight line may be used.

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

[0081] (7) In the above embodiment, the case where the first direction L1 is perpendicular to the display surface of the liquid crystal panel 20 is exemplified and described, but the first direction L1 may 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: Housing portion, 67A: Phosphor, 70: Reflective member, 73: Side wall portion, S1: Emitted light, R1: Reflected light

Claims

1. A light source, and a reflecting member that surrounds and arranges the light source around an axis with a first direction as the 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. In the first direction, the first light source element and the second light source element are arranged in this order. The lighting device.

2. The lighting device according to claim 1, wherein the second light source element is mounted on the first light source element. The lighting device.

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

4. The lighting device according to claim 1, wherein the light source has a housing portion that houses the first light source element and the second light source element, and the housing portion is filled with a phosphor that wavelength-converts the emitted light of at least one of the first light source element and the second light source element. The lighting device.

5. The lighting device according to claim 4, wherein 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 blue light into white light. The lighting device.

6. The lighting device according to claim 1, and includes a reflective layer that reflects light between the first light source element and the second light source element. The lighting device.

7. The lighting device according to any one of claims 1 to 6, and A display device having a display panel that displays pixels using light emitted from the lighting device.

8. The display device according to claim 7, wherein the display panel is a liquid crystal panel.

Images