JP2019091625A - Light source, and backlight device and display device including the same - Google Patents

Abstract

To provide an inexpensive light source device for attaining a backlight device which can suppress occurrence of color shading, the light source device having combined configuration of a blue LED and a quantum dot.SOLUTION: A light source device 63 comprises: an LED package 631P containing a blue LED 631; a quantum dot sheet 637 containing a quantum dot 632 for converting a wavelength of light emitted from the blue LED 631 so that emission light to the outside becomes white; a jig 638 of light permeability fixing the quantum dot sheet 637 above the LED package 631P. The jig 638 comprises an installation part where the quantum dot sheet 637 is installed, and a support part having a light scattering structure and supporting the installation part. A relative height of a holding frame part of the support part to an upper surface of the quantum dot sheet 637 is equal to or more than 0.SELECTED DRAWING: Figure 8

Description

  The following disclosure relates to a light source device, and more particularly, to a light source device that obtains white light by a combination of a blue LED and a quantum dot, a backlight device including the light source device, and a display device.

  In a liquid crystal display device that displays a color image, color display is performed by additive color mixing of three primary colors. Therefore, a transmissive liquid crystal display device requires a backlight device capable of irradiating a liquid crystal panel with white light containing a red component, a green component, and a blue component. Conventionally, a cold cathode tube called CCFL has often been adopted as a light source device in a backlight device. However, in recent years, the adoption of LEDs has been increasing in terms of low power consumption and ease of brightness control. For example, backlight devices configured using red LEDs, green LEDs, and blue LEDs as light sources are conventionally known.

  Further, in recent years, as a technology for realizing a wide color gamut, a technology of obtaining white light by combining a blue LED and a quantum dot has attracted attention. For example, in a white LED package called “surface mount type” as shown in FIG. 40, a configuration in which a blue LED and a quantum dot are combined is adopted. In this white LED package, the blue LED 801 provided on the package substrate 810 is covered by the quantum dot 802. More specifically, the blue LED 801 is covered by a resin including green quantum dots and red quantum dots. Thus, in this configuration, the quantum dots are distributed in the LED package. In a region around the blue LED 801 on the package substrate 810, a reflector 820 for reflecting light is provided. The anode of the blue LED 801 is connected to the electrode 841 through the bonding wire 831, and the cathode of the blue LED 801 is connected to the electrode 842 through the bonding wire 832. Examples of the quantum dot 802 to be used include a combination of a green quantum dot having an emission peak wavelength of 500 to 550 nm and a red quantum dot having an emission peak wavelength of 600 nm or more. According to such a configuration, the half value widths of the green light and the red light can be narrowed. Therefore, by combining a backlight device having a configuration using quantum dots and a liquid crystal panel having a configuration using a high density color filter, the wide color gamut of the liquid crystal display device is realized.

  In addition, backlight systems used in liquid crystal televisions are roughly classified into direct-light type and edge-light type. With regard to edge-light type backlight apparatuses, a system using quantum dots (hereinafter referred to as "QD capillary system") There is one that has adopted. Here, "QD" is an abbreviation of "Quantum Dot" (quantum dot). FIG. 41 is a schematic cross-sectional view of a backlight device adopting a QD capillary system. In this backlight device, a quantum dot 852 enclosed in a glass (elongated glass tube) 870 is disposed between the blue LED 851 and the light guide 880. A reflector 860 for reflecting light is provided to cover the glass 870 enclosing the quantum dots 852 and the blue LED 851. As the quantum dot 852, for example, a combination of a green quantum dot and a red quantum dot is used. In such a configuration, light emitted from the blue LED 851 becomes white light by passing through the quantum dot 852 and is incident on the light guide 880. Thus, white light is emitted from the light guide 880 toward the liquid crystal panel (not shown).

  In general, quantum dots have the property of being sensitive to heat and humidity. In this regard, according to the surface mount type configuration shown in FIG. 40, the quantum dots 802 are arranged very close to the blue LED 801. Further, unlike the quantum dot sheet described later, the quantum dot 802 in the surface mount type configuration is not provided with a barrier film for protection from humidity. From the above, according to the surface mount type configuration, the quantum dot 802 is easily deteriorated. In this respect, according to the QD capillary method shown in FIG. 41, the quantum dot 852 is enclosed in the glass 870 and disposed at a position separated to some extent from the blue LED 851. Therefore, in the QD capillary system, the quantum dots 852 are less likely to be degraded by the effects of heat and humidity.

  Further, in recent years, a technique of obtaining white light by combining a blue LED and a phosphor sheet is also attracting attention. The phosphor sheet contains a phosphor which is excited by the light emitted from the blue LED to emit light. Specific examples of the phosphor sheet to be used include a phosphor sheet containing a yellow phosphor and a phosphor sheet containing a green phosphor and a red phosphor. With respect to such a phosphor sheet, it is also considered to adopt quantum dots as the phosphor.

  FIG. 42 is a side view showing a schematic configuration of a conventional backlight device that obtains white light by a combination of a blue LED and a phosphor sheet. This backlight device diffuses light emitted from a plurality of blue LEDs 93 as a light source, an LED substrate 92 on which the plurality of blue LEDs 93 are mounted, and the blue LEDs 93 to diffuse the light into a uniform light. A plate 94, a phosphor sheet 95 for converting the wavelength of light emitted from the blue LED 93 so as to obtain white light, an optical sheet 96 for enhancing the utilization efficiency of light, a chassis for supporting the LED substrate 92 and the like It is composed of In FIG. 42, the chassis is not shown. In the configuration using the blue LED 93 as a light source, as shown in FIG. 42, by providing a phosphor sheet (for example, a phosphor sheet containing a yellow phosphor) 95, white light is emitted from the backlight device as backlight. It is emitted.

  By the way, regarding the liquid crystal display device, it has been a problem to reduce the power consumption conventionally. Therefore, in recent years, a liquid crystal display device has been developed in which the screen is logically divided into a plurality of areas and local dimming processing is performed to control the luminance (emission intensity) of the light source device for each area. In the local dimming process, the brightness of the light source device is controlled based on the input image in the corresponding area. Specifically, the luminance of each light source device is obtained based on the maximum value or the average value of the target luminance (luminance corresponding to the input tone value) of the pixels included in the corresponding area. Then, in an area in which the luminance of the light source device is smaller than the original luminance, the transmittance of each pixel is enhanced. As a result, target display luminance can be obtained in each pixel. Also, in recent years, development of HDR drive for displaying an extremely wide dynamic range has been brisk. Local dimming processing is also used to realize this HDR drive.

  When a local dimming process is performed in a liquid crystal display device provided with a backlight device having a configuration using a phosphor sheet (see FIG. 42), only the light source device (blue LED 93) in a partial area lights up (hereinafter referred to as Uneven color may occur due to "partial lighting". This will be described below. An area in which the light source device is in the lighting state is referred to as a "lighting area", and an area in which the light source device is in the extinguishing state is referred to as a "non-lighting area".

  FIGS. 43 to 45 are diagrams respectively showing the luminance, the chromaticity x, and the chromaticity y when lighting (partial lighting) of only one central area is performed in a configuration using white LEDs. 46 to 48 are views respectively showing the luminance, the chromaticity x, and the chromaticity y when lighting (partial lighting) of only one central area is performed in the configuration using the phosphor sheet. From FIGS. 43 to 48, it is understood that in the configuration using the phosphor sheet, the difference in chromaticity depending on the place is large as compared with the configuration using the white LED. Further, as can be understood from FIGS. 47 and 48, in the configuration using the phosphor sheet, the backlight is in the vicinity immediately above the lit blue LED (the portion indicated by the arrow 99 in FIGS. 47 and 48). The color of light is bluish, and the color of backlight is yellowish as it goes away from the lighting point. As described above, when partial lighting is performed in the configuration using the phosphor sheet, color unevenness occurs due to the small amount of light mixed in each area.

  49 to 51 show the luminance, the chromaticity x, and the chromaticity y when lighting (partial lighting) of 36 areas (six vertical areas × horizontal six areas) is performed in the configuration using the phosphor sheet. FIG. 52 to 54 are diagrams respectively showing the luminance, the chromaticity x, and the chromaticity y when the entire lighting is performed in the configuration using the phosphor sheet. From FIGS. 47, 48, 50, 51, 53 and 54, it is understood that the chromaticity of the backlight light in the vicinity immediately above the lit blue LED is different according to the lighting range. That is, depending on the lighting range, the color unevenness is generated differently.

  Here, with reference to FIG. 55, the reason why the color unevenness occurs when the partial lighting is performed in the configuration using the phosphor sheet will be described. The light 9 a emitted from the blue LED 93 is divided into light (component) 9 b passing through the optical sheet 96 and light (component) 9 c reflected by the optical sheet 96 after passing through the phosphor sheet 95. That is, a part of the component of the light 9 a emitted from the blue LED 93 is reflected by the optical sheet 96 and returns to the LED substrate 92 side. Since a reflective sheet that generally reflects light is attached to the surface of the LED substrate 92, the light 9 c reflected by the optical sheet 96 is further reflected by the LED substrate 92. The reflected light 9 d is divided into light 9 e passing through the optical sheet 96 and light 9 f reflected by the optical sheet 96 after passing through the phosphor sheet 95. Similarly, light 9 f reflected by the optical sheet 96 is reflected by the LED substrate 92, and light 9 g reflected by the LED substrate 92 is divided into light 9 h passing through the optical sheet 96 and light 9 i reflected by the optical sheet 96. . As described above, when light is repeatedly reflected, the color of light takes on a yellowish color each time it passes through the phosphor sheet 95. Therefore, focusing on the emitted light from one blue LED 93, the color of the light becomes yellowish as the area is farther from the blue LED 93. In the example shown in FIG. 55, the color of light 9e is more yellowish than the color of light 9b, and the color of light 9h is more yellowish than the color of light 9e.

  As described above, light emitted from one blue LED 93 reaches the surrounding area by repeating reflection. In other words, not only the light emitted from the blue LED 93 corresponding to the area but also the light of the reflection component of the light emitted from the blue LED 93 corresponding to the surrounding area is irradiated to a certain area. In consideration of such a point, the content (phosphor concentration) of the phosphor in the phosphor sheet 95 is adjusted so that the backlight light becomes white light when the entire lighting is performed.

  However, when partial lighting is performed, the amount of yellowish light that reaches the lighting area from other areas is smaller than when lighting is performed entirely. As a result, the color of the backlight light appearing in the lighting area is bluish and the white balance is broken. About this, it becomes remarkable, so that the range where partial lighting is performed is narrow. Further, since the light emitted from the blue LED 93 is also reflected and reaches the surrounding area, the light is also irradiated to the non-lighting area when the partial lighting is performed. At this time, the color of the light gradually becomes yellowish as it goes away from the lighting area, so that color unevenness occurs.

  Therefore, Japanese Patent Application Laid-Open No. 2015-216104 discloses an invention of a light source device in which the spread of light is suppressed by providing a suppressing member that divides the area of the light emitting surface. According to this light source device, leakage of light emitted from the light source and transmitted through the conversion member (quantum dot) to the adjacent region is suppressed, and as a result, color unevenness and brightness unevenness are reduced.

Japanese Unexamined Patent Publication No. 2015-216104

  However, according to the light source device disclosed in Japanese Patent Application Laid-Open No. 2015-216104, the structure becomes complicated, and a large amount of quantum dots are required. Therefore, the manufacturing cost of the light source device is increased.

  Therefore, the following disclosure is a light source device for realizing a backlight device capable of suppressing the occurrence of color unevenness, and it is an object of the present invention to provide at low cost a light source device having a configuration in which a blue LED and a quantum dot are combined. I assume.

A light source device according to some embodiments includes a light emitting device package including a blue light emitting device that emits blue light.
A quantum dot containing body containing quantum dots for converting the wavelength of light emitted from the blue light emitting element so that the color of light emitted to the outside becomes white;
A translucent jig for fixing the quantum dot assembly above the light emitting device package;
The jig is
A mounting portion located immediately above the light emitting device package and on which the quantum dot inclusion is mounted;
And a supporting portion having a light scattering structure, which is located around the light emitting device package and supports the mounting portion.
The support portion includes a fixed leg portion located below the connecting portion with the mounting portion, and a holding frame portion located above the connecting portion with the mounting portion.
The relative height of the holding frame portion to the top surface of the quantum dot inclusion is 0 or more.

  In the light source device configured to use a blue light emitting element and a quantum dot, the quantum dot is disposed above the blue light emitting element and relatively close to the blue light emitting element. For this reason, the light emitted from the blue light emitting element is immediately converted to white light. Further, the support portion of the jig for fixing the quantum dot inclusion has a light scattering structure. For this reason, blue light is emitted upward from the holding frame portion of the support portion. As a result, since yellow light and blue light are mixed in the vicinity of the peripheral portion of the quantum dot inclusion body, the occurrence of color unevenness due to the emission of yellowish light is suppressed. Further, when a backlight device for a display device is realized using this light source device, the quantum dots are not provided in the region corresponding to the entire display unit of the display device, but provided only above each light emitting element package. . This reduces the amount of quantum dots required and can reduce manufacturing costs. From the above, it is possible to provide at low cost a light source device for realizing a backlight device capable of suppressing the occurrence of color unevenness and having a configuration in which a blue LED and a quantum dot are combined.

It is a block diagram which shows the whole structure of the liquid crystal display device provided with the backlight apparatus which concerns on 1st Embodiment. It is a perspective view of the liquid crystal panel in the said 1st Embodiment, and a backlight apparatus. It is a side view of a liquid crystal panel and a back light device in a 1st embodiment of the above. FIG. 7 is a diagram for describing an area in the first embodiment. In the said 1st Embodiment, it is a flowchart which shows an example of the procedure of a local dimming process. FIG. 7 is a diagram for describing control of light emission luminance by local dimming processing in the first embodiment. FIG. 6 is a schematic view showing a configuration of a unit drive unit for driving a blue LED included in one area in the first embodiment. It is a figure which shows the detailed structure of the light source device in the said 1st Embodiment. It is a figure which shows one structural example of the quantum dot sheet | seat in said 1st Embodiment. It is a figure for demonstrating the structure of a jig | tool in said 1st Embodiment. It is a figure for demonstrating the structure of a jig | tool in said 1st Embodiment. In the said 1st Embodiment, it is a figure for demonstrating the reason for the mounting part of a jig not having a space part. It is a figure for demonstrating the color of the emitted light in case the color of a jig | tool is transparent. It is a figure for demonstrating the color of the emitted light in case the color of a jig | tool is transparent. It is a figure for demonstrating advancing of the light in case the color of a jig | tool is transparent. It is a figure for demonstrating advancing of the light in the said 1st Embodiment. It is a figure for demonstrating advancing of the light in the said 1st Embodiment. It is a figure for demonstrating the color of the emitted light in the said 1st Embodiment. It is a figure for demonstrating the case where the height of the holding frame part of a jig | tool is high suitably. It is a figure for demonstrating wall height, the thickness of a quantum dot sheet | seat, and relative wall height in the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure for demonstrating the result of the experiment which made only one light source device light regarding the said 1st Embodiment. It is a figure which shows the detailed structure of the light source device in 2nd Embodiment. It is a figure for demonstrating the jig | tool in said 2nd Embodiment. It is a figure which shows the detailed structure of the light source device in 3rd Embodiment. It is a figure for demonstrating the jig | tool in the said 3rd Embodiment. In the said 3rd Embodiment, it is the figure which showed typically the surface to which the roughening process was performed. It is a figure for demonstrating advancing of the light in the said 3rd Embodiment. It is a figure for demonstrating advancing of the light in the said 3rd Embodiment. It is a figure for demonstrating the jig | tool in the 1st modification of said 3rd Embodiment. It is a figure for demonstrating the jig | tool in the 2nd modification of said 3rd Embodiment. It is a figure which shows the structure of the surface mounting type white LED package which used combining blue LED and the quantum dot regarding a prior art example. It is a schematic sectional drawing of the backlight apparatus which employ | adopted the QD capillary system regarding a prior art example. It is a side view which shows schematic structure of the backlight apparatus which has obtained white light by the combination of blue LED and a fluorescent substance sheet regarding a prior art example. It is a figure which shows the brightness | luminance when lighting of only one center area is performed by the structure using white LED. It is a figure which shows the chromaticity x when lighting of only one center area is performed by the structure using white LED. It is a figure which shows the chromaticity y when lighting of only one center area is performed by the structure using white LED. It is a figure which shows the brightness | luminance at the time of lighting only one center area being performed by the structure using a fluorescent substance sheet. It is a figure which shows the chromaticity x when lighting of only one center area is performed by the structure using a fluorescent substance sheet. It is a figure which shows the chromaticity y when lighting of only one center area is performed by the structure using a fluorescent substance sheet. It is a figure which shows the brightness | luminance at the time of lighting of 36 areas (six areas long x six areas wide) by the structure using a fluorescent substance sheet. It is a figure which shows the chromaticity x at the time of lighting of 36 areas (six areas long x six areas wide) by the structure using a fluorescent substance sheet. It is a figure which shows the chromaticity y at the time of lighting of 36 areas (six areas long x six areas wide) by the structure using a fluorescent substance sheet. It is a figure which shows the brightness | luminance when the whole surface lighting is performed by the structure using a fluorescent substance sheet. It is a figure which shows the chromaticity x when the whole surface lighting is performed by the structure using a fluorescent substance sheet. It is a figure which shows the chromaticity y when the whole surface lighting is performed by the structure using a fluorescent substance sheet. It is a figure for demonstrating the reason which a color nonuniformity arises, when partial lighting is performed by the structure using a fluorescent substance sheet.

  Hereinafter, embodiments will be described with reference to the accompanying drawings.

<1. First embodiment>
<1.1 Overall Configuration and Operation Overview>
FIG. 1 is a block diagram showing the overall configuration of a liquid crystal display device provided with a backlight device 600 according to the first embodiment. The liquid crystal display device includes a display control circuit 100, a gate driver (scanning signal line driving circuit) 200, a source driver (video signal line driving circuit) 300, a liquid crystal panel 400, a light source control unit 500, and a backlight device 600. ing. The liquid crystal panel 400 includes a display unit 410 for displaying an image. The gate driver 200 and / or the source driver 300 may be provided in the liquid crystal panel 400.

  Referring to FIG. 1, in the display unit 410, a plurality (n) of source bus lines (video signal lines) SL1 to SLn and a plurality (m) of gate bus lines (scanning signal lines) GL1 to GLm are arranged. It is set up. A pixel formation portion 4 for forming a pixel is provided corresponding to each intersection of the source bus lines SL1 to SLn and the gate bus lines GL1 to GLm. That is, the display unit 410 includes a plurality (m × n) of pixel formation units 4. The plurality of pixel formation portions 4 are arranged in a matrix to form a pixel matrix. In each pixel formation portion 4, a TFT (Thin Film Transistor) is a switching element in which the gate terminal is connected to the gate bus line GL passing the corresponding intersection and the source terminal is connected to the source bus line SL passing the intersection 40, a pixel electrode 41 connected to the drain terminal of the TFT 40, a common electrode 44 and a storage capacitance electrode 45 commonly provided to the plurality of pixel forming portions 4, a pixel electrode 41 and a common electrode 44, And a storage capacitor 43 formed by the pixel electrode 41 and the storage capacitor electrode 45. The liquid crystal capacitance 42 and the auxiliary capacitance 43 constitute a pixel capacitance 46. In the display unit 410 in FIG. 1, only the components corresponding to one pixel formation unit 4 are shown.

  Incidentally, as the TFT 40 in the display unit 410, for example, an oxide TFT (a thin film transistor using an oxide semiconductor in a channel layer) can be employed. More specifically, In—Ga—Zn—O (indium gallium zinc oxide) which is an oxide semiconductor containing indium (In), gallium (Ga), zinc (Zn), and oxygen (O) as main components A TFT in which a channel layer is formed (hereinafter referred to as “In-Ga-Zn-O-TFT”) can be employed as the TFT 40. By employing such an In-Ga-Zn-O-TFT, effects such as high definition and low power consumption can be obtained. Alternatively, a transistor in which an oxide semiconductor other than In—Ga—Zn—O (indium gallium zinc oxide) is used for a channel layer can also be employed. For example, it contains at least one of indium, gallium, zinc, copper (Cu), silicon (Si), tin (Sn), aluminum (Al), calcium (Ca), germanium (Ge), and lead (Pb) The same effect can be obtained also in the case of employing a transistor in which an oxide semiconductor is used for a channel layer. The use of TFTs other than oxide TFTs is not excluded.

  Next, the operation of the components shown in FIG. 1 will be described. The display control circuit 100 receives an image signal DAT sent from the outside and a timing signal group TG such as a horizontal sync signal or a vertical sync signal, and controls the digital video signal DV and the gate start pulse for controlling the operation of the gate driver 200. Signal GSP and gate clock signal GCK, source start pulse signal SSP for controlling the operation of source driver 300, source clock signal SCK, and latch strobe signal LS, light source control for controlling the operation of light source control unit 500 And the signal BS.

  The gate driver 200 transmits active scan signals G (1) to G (m) to the gate bus lines GL1 to GLm based on the gate start pulse signal GSP and the gate clock signal GCK sent from the display control circuit 100. The application is repeated with one vertical scanning period as a cycle.

  The source driver 300 receives the digital video signal DV, the source start pulse signal SSP, the source clock signal SCK, and the latch strobe signal LS sent from the display control circuit 100, and drives the video signal S (1 (one)) to the source bus lines SL1 to SLn. ) To S (n). At this time, in the source driver 300, digital video signals DV indicating voltages to be applied to the source bus lines SL1 to SLn are sequentially held at the timing when the pulse of the source clock signal SCK is generated. Then, at the timing when the pulse of the latch strobe signal LS is generated, the held digital video signal DV is converted into an analog voltage. The converted analog voltages are simultaneously applied to all the source bus lines SL1 to SLn as drive video signals S (1) to S (n).

  The light source control unit 500 controls the luminance (emission intensity) of the light source device in the backlight device 600 based on the light source control signal BS sent from the display control circuit 100. Thereby, backlight light is irradiated from the backlight device 600 to the back surface of the liquid crystal panel 400. In the present embodiment, local dimming processing is performed.

  As described above, scanning signals G (1) to G (m) are applied to gate bus lines GL1 to GLm, and driving video signals S (1) to S (n) are applied to source bus lines SL1 to SLn. By controlling the luminance of the light source device in the backlight device 600, an image according to the image signal DAT sent from the outside is displayed on the display unit 410.

<1.2 Outline of backlight device>
FIG. 2 is a perspective view of the liquid crystal panel 400 and the backlight device 600. FIG. 3 is a side view of the liquid crystal panel 400 and the backlight device 600. The backlight device 600 is provided on the back of the liquid crystal panel 400. That is, the backlight device 600 in the present embodiment is a direct type backlight device.

  The backlight device 600 includes a chassis 61, an LED substrate 62, a plurality of light source devices 63, a diffusion plate 64, and an optical sheet 65. Each light source device 63 includes a blue LED 631 and a quantum dot 632. The chassis 61 supports the LED substrate 62 and the like. The LED substrate 62 is, for example, a metal substrate, and has a plurality of light source devices 63 mounted thereon. A reflective sheet is attached to the surface of the LED substrate 62 in order to enhance the utilization efficiency of the light emitted from the light source device 63. The blue LED 631 emits blue light. The quantum dot 632 converts the wavelength of the light emitted from the blue LED 631 so that the light emitted from the light source device 63 is white light. The diffusion plate 64 is disposed at a position several mm to several cm above the light source device 63. The diffusion plate 64 diffuses the light emitted from the light source device 63 so that the backlight light becomes flat and uniform. The optical sheet 65 is disposed above the diffusion plate 64. In general, the optical sheet 65 is composed of a plurality of sheets. Each of the plurality of sheets has a function of diffusing light, a condensing function, and a function of enhancing the utilization efficiency of light. A detailed description of the configuration of the light source device 63 will be described later.

  By the way, in the present embodiment, in order to perform the local dimming process, as shown in FIG. 4, the display unit 410 displaying an image logically (not physically) controls a plurality of areas (control of the light source device 63 It is divided into areas that are the smallest units to be performed. A light source device 63 is provided on the LED substrate 62 so as to correspond to each area, and the control of the luminance (emission intensity) of the light source device 63 is performed for each area. The number of light source devices 63 provided in each area is not particularly limited.

<1.3 About local dimming process and driving of backlight device>
Here, an example of the procedure of the local dimming process will be described with reference to FIG. The local dimming process is performed by a local dimming processing unit (not shown) in the display control circuit 100 (see FIG. 1). Here, it is assumed that the display unit 410 is divided into (vertical p × horizontal q) areas.

  First, an image signal DAT sent from the outside is input to the local dimming processing unit as input image data (step S11). The input image data includes the luminance (luminance data) of (m × n) pixels. Next, the local dimming processing unit performs subsampling processing (averaging processing) on the input image data to obtain a reduced image including luminances of (sp × sq) (s is an integer of 2 or more) pixels (Step S12). Next, the local dimming processing unit divides the reduced image into data of (p × q) areas (step S13). The data of each area includes the luminance of (s × s) pixels. Next, the local dimming processing unit obtains, for each of the (p × q) areas, the maximum value Ma of the luminance of the pixels in the area and the average value Me of the luminances of the pixels in the area (step S14) . Next, the local dimming processing unit is a light emission luminance (light emission luminance of the blue LED 631) of the light source device 63 corresponding to each area based on the maximum value Ma, the average value Me, etc. obtained in step S14 (p × q) The light emission luminances are determined (step S15).

  Next, the local dimming processing unit obtains (tp × tq) (t is an integer of 2 or more) display luminances based on the (p × q) emission luminances obtained in step S15 (step S16). Next, the local dimming processing unit performs linear interpolation processing on (tp × tq) display luminances to obtain backlight luminance data including (m × n) display luminances (step S17). . The backlight luminance data represents the luminance of light incident on (m × n) pixels when all the light source devices 63 emit light with the emission luminance obtained in step S15. Next, the local dimming processing unit divides the luminance of (m × n) pixels included in the input image by (m × n) display luminances included in the backlight luminance data, respectively ( The light transmittance of m × n pixels is obtained (step S18). Finally, the local dimming processing unit causes the digital video signal DV corresponding to the data representing the light transmittance obtained in step S18 and the light source device 63 corresponding to each area to emit light with the light emission luminance obtained in step S15. The light source control signal BS is output (step S19).

  By performing the local dimming process as described above, light of different luminance (emission intensity) is emitted for each area as schematically shown in FIG. In FIG. 6, the brightness (emission intensity) of light is represented by the thickness of the arrow.

  FIG. 7 is a schematic view showing a configuration of a unit drive unit 50 for driving the blue LED 631 included in one area. FIG. 7 shows an example in which four light source devices 63 are provided in one area, that is, an example in which four blue LEDs 631 are provided in one area. As shown in FIG. 7, the unit drive unit 50 includes a power supply 52 and a current control transistor 54. For the current control transistor 54, the light source control signal BS is supplied to the gate terminal, the drain terminal is connected to the blue LED 631, and the source terminal is grounded. Four blue LEDs 631 are connected in series between the power supply 52 and the drain terminal of the current control transistor 54. In such a configuration, the light source control signal BS according to the target luminance (emission intensity) of the blue LED 631 is applied to the gate terminal of the current control transistor 54. Thereby, the drive current Im flows according to the target luminance of the blue LED 631.

<1.4 Detailed Configuration of Light Source Device>
FIG. 8 is a diagram showing a detailed configuration of the light source device 63 in the present embodiment. The light source device 63 in the present embodiment includes a blue LED 631, a package substrate 633, a reflector 634, bonding wires 635 a and 635 b, electrodes 636 a and 636 b, a quantum dot sheet 637 including quantum dots 632, and a jig 638. It is composed of One LED package 631 P is configured by the blue LED 631, the package substrate 633, the reflector 634, the bonding wires 635 a and 635 b, and the electrodes 636 a and 636 b.

  Here, one configuration example of the quantum dot sheet 637 will be described with reference to FIG. The quantum dot sheet 637 in this embodiment includes a resin film 70, a moisture resistant barrier film (protective film) 72a covering the surface of the resin film 70, and a moisture resistant barrier film (protective film) covering the back surface of the resin film 70. And 72b. The resin film 70 is made of a resin 71 in which quantum dots 632 are sealed. For example, a green quantum dot whose emission peak wavelength is 500 to 550 nm and a red quantum dot whose emission peak wavelength is 600 nm or more are enclosed in the resin 71 as the quantum dot 632. Thus, in the present embodiment, the quantum dots 632 are protected by the barrier films 72a and 72b.

  Next, the jig 638 in the present embodiment will be described in detail with reference to FIGS. 8 and 10 to 12. The jig 638 is made of resin and has a shape of H-shaped cross section. Further, the jig 638 has a light transmitting property, and is constituted by a mounting portion 638a for mounting the quantum dot sheet 637, and a support portion 638b supporting the mounting portion 638a (FIG. 10). reference). The mounting portion 638a is formed in a planar shape so as to cover the entire top of one LED package 631P (see FIGS. 8 and 10). The support portion 638 b is formed to surround the periphery of one LED package 631 P. The supporting portion 638b is composed of a fixed leg portion 682 located lower than a connecting portion 638p with the mounting portion 638a and a holding frame 683 located above the connecting portion 638p with the mounting portion 638a (see FIG. 11). The fixed leg portion 682 is fixed to the LED substrate 62 (see FIG. 3). With the above-described configuration, a recess 684, which is a space for disposing the quantum dot sheet 637, is formed above the placement portion 638a. The reason why the mounting portion 638a of the jig 638 does not have the space portion 901 as shown in FIG. 12 is that liquid quantum dots are used for the jig 638 (more specifically, FIG. 11). This is because it is possible to adopt a method of injecting into the recess 684) and baking them. However, the method for producing the light source device 63 is not particularly limited. Further, by providing the holding frame portion 683 as described above, when the liquid quantum dots are injected into the jig 638, the liquid quantum dots are prevented from flowing out.

  Based on the configuration of the jig 638 as described above, the configuration of the light source device 63 shown in FIG. 8 will be described in detail. The blue LED 631 is provided on the package substrate 633 and is covered with a sealing material such as a resin. In a region around the blue LED 631 on the package substrate 633, a reflector 634 for reflecting light is provided. The anode of the blue LED 631 is connected to the electrode 636a through the bonding wire 635a, and the cathode of the blue LED 631 is connected to the electrode 636b through the bonding wire 635b. A jig 638 is provided around the LED package 631 P, and the quantum dot sheet 637 is fixed to the mounting portion 638 a (see FIG. 10) of the jig 638. Thus, for each light source device 63, the quantum dot sheet 637 including the quantum dots 632 is disposed on the placement portion 638a (of the jig 638) located immediately above the LED package 631P. In place of the quantum dot sheet 637, for example, a sheet-like glass in which the quantum dots 632 are enclosed may be placed on the placement portion 638a of the jig 638.

  In the configuration as described above, the light (blue light) emitted from the blue LED 631 of each light source device 63 is converted into white light by the quantum dots 632 in the quantum dot sheet 637. As a result, the liquid crystal panel 400 is irradiated with white light.

  In the present embodiment, a light emitting element package is realized by the LED package 631P, and a quantum dot inclusion is realized by the quantum dot sheet 637.

<1.5 Measures against color unevenness>
By the way, according to the method of providing a jig and fixing the quantum dot sheet above the LED package, color unevenness may occur. Therefore, in the present embodiment, measures against color unevenness as described below are taken.

<1.5.1 Jig color>
If the color of the jig 638 is transparent, as shown in FIG. 13, the color of the light emitted right above the blue LED 631 will be white, but the color of the light emitted away from the center will be yellowish. It becomes a different color. That is, when the light source device 63 is viewed from the top, as schematically shown in FIG. 14, a circular yellowish colored portion 73 is generated at a position away from the position of the blue LED 631. As a result, color unevenness occurs on the optical sheet 65.

  So, in this embodiment, jig 638 which consists of polycarbonate resin with which a white coloring agent was added inside as a scattering agent is adopted. That is, the entire jig 638 is translucent white, and the jig 638 has a light scattering structure. Accordingly, blue light is scattered inside the jig 638.

  According to the configuration as described above, if a transparent jig is adopted, blue light leaking from the jig supporting portion 638b to the outside as shown by the arrow 74a in FIG. Scattered by the scattering agent in the portion 638b. Thus, with respect to the blue light 75 directed from the inside to the outside of the jig 638, there are more components in which the incident angle θ to the outer wall of the jig 638 is larger than when the transparent jig is employed (see FIG. 16) The component reflected by the outer wall of the jig 638 is increased (in particular, total reflection occurs when the incident angle θ becomes equal to or more than the critical angle). In this way, as shown by the arrow 74b in FIG. 17, the component of blue light scattered by the scattering agent 639 in the support 638b and emitted upward from the support 638b is increased. The emitted light from the blue LED 631 is scattered by the scattering agent 639 in various directions, but in FIG. 17, attention is focused only on the component scattered in one direction (the same applies to FIGS. 36 and 37).

  From the above, as shown in FIG. 18, blue light is emitted upward from the holding frame portion 683 of the jig 638, and yellow light and blue light are mixed together in a place away from the center to become white light (blue Among the light emitted from the blue LED 631 and transmitted through the quantum dot sheet 637, there is also light which did not hit the quantum dot 632 in the quantum dot sheet 637. In FIG. 8 and FIG. 18 etc., it is indicated by hatching that the jig 638 is translucent white.

<1.5.2 Height of jig>
Even when the color of the jig 638 is translucent white as described above, if the height of the holding frame 683 of the jig 638 is inappropriately high, the blue LED 631 emits the quantum dot sheet 637. Of the light that has not passed through the quantum dot sheet 637 in the quantum dot sheet 637 (ie, the blue light), as shown by the arrow 76 in FIG. The component (component of blue light) leaking around 638 is increased. In addition, if the height of the holding frame portion 683 of the jig 638 is inappropriately high, the reflection is repeated in the jig 638, and the blue light emitted upward from the holding frame portion 683 is also repeatedly reflected. The strength is weakened by increasing. From the above, the component of the blue light irradiated near the upper portion of the holding frame portion 683 of the jig 638 becomes insufficient, and the color of the emitted light at a place away from the center becomes a slightly yellowish color. As a result, color unevenness occurs on the optical sheet 65.

  Therefore, in the present embodiment, the height of the holding frame portion 683 of the jig 638 is optimized as follows. Here, as shown in FIG. 20, the distance from the mounting surface on which the quantum dot sheet 637 is mounted to the upper end portion of the holding frame 683 (hereinafter referred to as “wall height” for convenience) is represented by H1. The thickness of the quantum dot sheet 637 is represented by H2, and the relative height of the holding frame 683 with respect to the upper surface of the quantum dot sheet 637 (hereinafter referred to as "relative wall height" for convenience) is represented by H3. As understood from FIG. 20, the sum of the thickness H2 of the quantum dot sheet 637 and the relative wall height H3 is the wall height H1.

  As for the wall height H1, the thickness of the quantum dot sheet 637 is set so that the liquid quantum dots do not flow to the periphery when the liquid quantum dots are injected into the jig 638 (concave portion 684 in FIG. 11). (Estimated thickness when liquid quantum dots are hardened) is set to H 2 or more. That is, the relative wall height H3 is set to 0 or more. Further, the relative wall height H3 is set to 1.0 mm or less so that the component of the blue light emitted upward from the holding frame portion 683 does not become insufficient.

  As mentioned above, in this embodiment, relative wall height H3 is defined as 0.00 mm or more and 1.0 mm or less. However, in consideration of the experimental results described later, the preferable relative wall height H3 is about 0.5 mm. Therefore, for example, when the thickness H2 of the quantum dot sheet 637 is 1.0 mm, the wall height H1 is preferably 1.5 mm.

<1.5.3 Experimental Results>
Here, when only one light source device 63 is turned on, the experimental result shows how the appearance of the color unevenness changes by changing the color of the jig and the wall height H1. In this experiment, a quantum dot sheet 637 with a thickness of 1.00 mm is used in which the differences due to the positions of the chromaticity x and the chromaticity y are as shown in FIGS. 21 and 22, respectively. FIG. 23 and FIG. 24 show the difference due to the position of the chromaticity x and the chromaticity y when using a transparent jig whose wall height H1 is 1.0 mm. FIG. 25 and FIG. 26 show the difference due to the position of the chromaticity x and the chromaticity y when using a translucent white jig with a wall height H1 of 3.0 mm. FIGS. 27 and 28 show the difference due to the position of the chromaticity x and the chromaticity y when using a translucent white jig with a wall height H1 of 1.5 mm. FIGS. 29 and 30 show the difference due to the position of the chromaticity x and the chromaticity y when using a translucent white jig with a wall height H1 of 1.0 mm. When FIG. 23, FIG. 24 and FIG. 25 to FIG. 30 are compared, it is understood that the occurrence of color unevenness is suppressed more by using a translucent white jig than by using a transparent jig. . Also, according to FIGS. 27 to 30, when a translucent white jig having a wall height H1 of 1.0 mm or 1.5 mm is used, the difference between the chromaticity x and the chromaticity y depending on the position is a color for human eyes It is grasped that it becomes an extent not to be recognized as unevenness. It can be understood from FIGS. 27 and 28 that the effect of preventing color unevenness can be obtained notably by using a translucent white jig having a wall height H1 of 1.5 mm.

  In consideration of the above experimental results, the relative wall height H3 (see FIG. 20) is 0.00 mm as described above (because the quantum dot sheet 637 having a thickness of 1.00 mm is used in the experiment) The height of the holding frame portion 683 is optimized so as to be 1.0 mm or less (0.5 mm is preferable).

<1.6 Effects>
According to the present embodiment, the backlight device 600 having the light source device 63 configured using the blue LED 631 and the quantum dot 632 includes the quantum dot 632 above the blue LED 631 and relatively close to the blue LED 631. A quantum dot sheet 637 is disposed. For this reason, the light emitted from the blue LED 631 is immediately converted to white light. In addition, a translucent white jig 638 having a light scattering structure is adopted as a jig for fixing the quantum dot sheet 637, and the height of the holding frame portion 683 of the jig 638 is an experimental result. Optimized based on. Therefore, even if yellowish light (yellow light) is emitted from the peripheral portion of the quantum dot sheet 637, blue light is sufficiently emitted upward from the holding frame portion 683 of the jig 638. And blue light mix and become white light. Thereby, the occurrence of color unevenness on the optical sheet 65 is prevented. As described above, the light source device 63 emits white light as in the case where a general white LED package is provided. Therefore, light propagating in the backlight device 600 is white light, and even if light reflection is repeated inside the device, yellowish light is emitted around the lighting area when partial lighting is performed. It will not be done. Therefore, even if local dimming processing is performed using the backlight device 600 according to the present embodiment, color unevenness due to repeated light reflection does not occur.

  Also, the jig 638 is only provided in the vicinity of the LED package 631P. In other words, compared to the conventional configuration disclosed in Japanese Patent Application Laid-Open No. 2015-216104, the area of the region surrounded by the jig 638 in this embodiment is greater than the area of the region surrounded by the suppression member in the conventional configuration. It is very small, and the height of the jig 638 in this embodiment is much lower than the height of the restraining member in the conventional configuration. That is, in the present embodiment, a physical member to be a wall is not provided at the boundary of the area. For this reason, even if there are individual differences (variations) in the blue LED 631 and the quantum dots 632, the occurrence of color unevenness and luminance unevenness caused by such individual differences is suppressed by mixing lights between adjacent areas. Ru. In addition, color unevenness due to the shadow of the jig 638 does not occur.

  In addition, although the quantum dot sheet 637 is disposed at a position relatively near to the blue LED 631 as described above, the quantum dot sheet 637 is disposed at a position distant from the blue LED 631 as compared with the surface mount type configuration shown in FIG. There is also an air layer between the blue LED 631 and the quantum dot sheet 637 as understood from FIG. Therefore, the quantum dots 632 are not degraded by the influence of heat. In addition, the quantum dots 632 are protected by moisture-resistant barrier films 72a and 72b (see FIG. 9). Therefore, the quantum dots 632 are not degraded by the influence of humidity.

  Furthermore, in comparison with the configuration disclosed in Japanese Unexamined Patent Publication No. 2015-216104, the structure is not complicated. Further, according to the configuration disclosed in Japanese Patent Application Laid-Open No. 2015-216104, quantum dots are provided to correspond to almost the entire surface of the display unit, but according to the present embodiment, each LED package 631 P (each The quantum dot 632 is provided only in the vicinity of immediately above the blue LED 631). This relatively reduces the amount of quantum dots 632 required. From the above, the manufacturing cost can be reduced.

  As described above, according to the present embodiment, the direct-type backlight device 600 that includes the light source device 63 configured by combining the blue LED 631 and the quantum dot 632 and that can suppress the occurrence of color unevenness is realized at low cost. be able to.

  Further, in the liquid crystal display device according to the present embodiment, local dimming processing is performed. That is, the light emission intensity of the blue LED 631 is controlled for each area. Therefore, power consumption can be reduced. In addition, the dynamic range can be expanded by causing the blue LED 631 to emit light intensively in the high gradation portion and with high light emission intensity.

<1.7 Modifications>
In the first embodiment, a jig 638 including a white colorant as a scattering agent was employed. However, the present invention is not limited to this. As long as the light transmission of the jig 638 is secured and the occurrence of color unevenness on the optical sheet 65 is suppressed, a jig containing a colorant of any color may be employed. Specifically, the blue light of the blue LED 631 may be scattered inside the jig 638. For example, the scattering agent may be achromatic, such as gray. Alternatively, the scattering agent may be blue similar to the blue LED 631.

<2. Second embodiment>
<2.1 Configuration>
The second embodiment will be described. The overall configuration, the outline of the backlight device 600, the procedure of the local dimming process, and the driving of the backlight device 600 are the same as in the first embodiment, and thus the description will be omitted (see FIGS. 1 to 7). .

  FIG. 31 is a diagram showing a detailed configuration of the light source device 63 in the present embodiment. In the first embodiment, the entire jig 638 is translucent white. On the other hand, the jig 638 in this embodiment has a translucent white portion and a transparent portion. More specifically, as shown in FIG. 32, the support portion 638b of the jig 638 is translucent white as in the first embodiment, but the mounting portion 638a of the jig 638 is transparent.

<2.2 Effects>
According to the present embodiment, since the mounting portion 638a of the jig 638 is transparent, the light (blue light) emitted from the blue LED 631 passes through the mounting portion 638a of the jig 638 and is efficiently performed. The light is incident on the quantum dot sheet 637. Thereby, blue light is efficiently converted to white light. That is, as compared with the first embodiment, the utilization efficiency of the blue light emitted from the blue LED 631 is improved. Since the utilization efficiency of blue light is thus improved, it is possible to reduce power consumption. As described above, according to this embodiment, in addition to the same effect as that of the first embodiment, the effect of reducing the power consumption can be obtained.

<3. Third embodiment>
<3.1 Configuration>
The third embodiment will be described. The overall configuration, the outline of the backlight device 600, the procedure of the local dimming process, and the driving of the backlight device 600 are the same as in the first embodiment, and thus the description will be omitted (see FIGS. 1 to 7). .

  FIG. 33 is a diagram showing a detailed configuration of the light source device 63 in the present embodiment. In the first embodiment, the entire jig 638 is translucent white. On the other hand, in the present embodiment, the entire jig 638 is transparent. Further, in the present embodiment, by blasting (for example, the abrasive material is sprayed on the surface of the object to be treated at a high speed to a part of the surface of the jig 638 (the hatched portion denoted by reference numeral 77 in FIG. 33). The surface is subjected to a roughening process (processing to roughen the surface of the object to be treated) such as processing the surface). More specifically, regarding the support portion 638b of the jig 638, as shown in FIG. 34, the inner and outer walls of the fixed leg 682 and the outer wall of the coupling portion 638p with the placement portion 638a, and the outer wall and upper portion of the holding frame 683 Disruption treatment is applied. In addition, although the effect mentioned later is inferior, you may make it give a roughening process only to the outer wall of the support part 638b. The surface subjected to the roughening treatment is not a smooth surface, but is a rough surface as schematically shown in FIG. The support portion 638 b of the jig 638 has a light scattering structure by being subjected to the above-described roughening treatment.

  According to the configuration as described above, the emitted light (blue light) from the blue LED 631 is scattered on the surface to which the roughening process is applied. Therefore, if a transparent jig which is not subjected to the roughening treatment is employed, blue light leaks from the supporting portion 638b of the jig to the outside as shown by the arrow 74a in FIG. A component scattered at the inner wall of the jig 638 as indicated by an arrow 78a indicated by an arrow 36 and emitted from the support portion 638b upward or an arrow indicated by an arrow 78b in FIG. The component scattered at the outer wall and emitted upward from the support portion 638 b is increased. As a result, blue light is emitted upward from the holding frame portion 683 of the jig 638, and yellow light and blue light are mixed at a location away from the center to become white light.

  Furthermore, in the present embodiment, the height of the holding frame portion 683 of the jig 638 is optimized as in the first embodiment. That is, the relative wall height H3 (see FIG. 20) described above is determined to be 0.00 mm or more and 1.0 mm or less (approximately 0.5 mm is preferable).

<3.2 Effects>
According to the present embodiment, the surface of the support portion 638 b of the jig 638 is roughened. Therefore, with respect to the light emitted from the blue LED 631, the component scattered on the surface subjected to the roughening treatment is increased, so the component transmitted through the support portion 638 b of the jig 638 and leaked from the side surface of the jig 638 is decreased. . In addition, the height of the holding frame portion 683 of the jig 638 is optimized based on the experimental result. As described above, as in the first embodiment, blue light is sufficiently emitted upward from the holding frame portion 683 of the jig 638. Therefore, even if yellowish light (yellow light) is emitted from the peripheral portion of the quantum dot sheet 637, the yellow light and the blue light are mixed to become white light. Thereby, the occurrence of color unevenness on the optical sheet 65 is prevented. Further, also in the present embodiment, the quantum dots 632 are provided only immediately above the respective LED packages 631P (each blue LED 631), so that the manufacturing cost can be reduced. As described above, as in the first embodiment, the direct-type backlight device 600 can be realized at low cost, and can include the light source device 63 configured by combining the blue LED 631 and the quantum dot 632 and can suppress the occurrence of color unevenness. Can.

<3.3 Modifications>
Hereinafter, a modification of the third embodiment will be described.

<3.3.1 First Modification>
In the third embodiment, as a configuration for preventing color unevenness, a configuration is adopted in which the surface of the support portion 638b (the shaded portion denoted by reference numeral 77 in FIG. 33) is roughened. On the other hand, in the present modification, the reflective paint is applied to the outer wall of the support portion 638b constituting the jig 638 (the shaded portion denoted by reference numeral 79 in FIG. 38). According to such a configuration, the emitted light (blue light) from the blue LED 631 is reflected by the outer wall portion of the support portion 638 b of the jig 638, so the blue light component leaking from the side surface of the jig 638 is reduced. As a result, the component of the blue light emitted upward from the support portion 638 b of the jig 638 is increased. Thereby, as in the third embodiment, even if yellowish light (yellow light) is emitted from the peripheral portion of the quantum dot sheet 637, yellow light and blue light are mixed to become white light, and the optical sheet The occurrence of color unevenness on the surface 65 is prevented.

<3.3.2 Second Modification>
In the present modification, as a configuration to prevent color unevenness, a part of the surface of the support portion 638 b constituting the jig 638 is processed into a shape that scatters light. Specifically, as shown in FIG. 39, the inner wall 80a of the fixed leg portion of the support portion, the outer wall 80b of the entire support portion, and the upper portion 80c of the support portion (holding frame portion) are processed into a jagged shape . According to such a configuration, the emitted light (blue light) from the blue LED 631 is a component that is scattered by the jagged surface and emitted upward from the support portion 638 b as in the third embodiment. Will increase. Thereby, as in the third embodiment, even if yellowish light (yellow light) is emitted from the peripheral portion of the quantum dot sheet 637, yellow light and blue light are mixed to become white light, and the optical sheet The occurrence of color unevenness on the surface 65 is prevented. In addition, although the jagged shape is mentioned as an example and demonstrated here, if it is a shape which can scatter light, it will not be limited to a jagged shape.

<4. Other>
Although the local dimming process is performed in each of the above-described embodiments (including the modification), the present invention is not limited to this. The present invention can also be applied to a liquid crystal display device in which the local dimming process is not performed.

  In each of the above-described embodiments (including the modification), the direct-type backlight device has been described as an example, but the present invention is not limited to this. The present invention can also be applied to backlight devices other than direct-type backlight devices.

  Moreover, in each said embodiment (a modification is included), although the liquid crystal display device was mentioned as the example and demonstrated, this invention is not limited to this. The present invention can be applied to display devices other than liquid crystal display devices as long as the display device has a configuration using a backlight device.

DESCRIPTION OF SYMBOLS 61 ... Chassis 62 ... LED board 63 ... Light source device 64 ... Diffusion plate 65 ... Optical sheet 400 ... Liquid crystal panel 410 ... Display part 500 ... Light source control part 600 ... Backlight apparatus 631 ... Blue LED
631P: LED package 632: Quantum dot 637: Quantum dot sheet 638: Jig 638a: Support portion 638b: Mounting portion 682: Fixed leg portion 683: Holding frame portion H1: Wall height (loading the quantum dot sheet Distance from the mounting surface to the upper end of the holding frame)
H2: Thickness of quantum dot sheet H3: Relative wall height (relative height of holding frame relative to upper surface of quantum dot sheet)

Claims (15)

A light emitting device package including a blue light emitting device that emits blue light;
A quantum dot containing body containing quantum dots for converting the wavelength of light emitted from the blue light emitting element so that the color of light emitted to the outside becomes white;
A translucent jig for fixing the quantum dot assembly above the light emitting device package;
The jig is
A mounting portion located immediately above the light emitting device package and on which the quantum dot inclusion is mounted;
And a supporting portion having a light scattering structure, which is located around the light emitting device package and supports the mounting portion.
The support portion includes a fixed leg portion located below the connecting portion with the mounting portion, and a holding frame portion located above the connecting portion with the mounting portion.
The relative height of the said holding frame part with respect to the upper surface of the said quantum dot containing body is 0 or more, The light source device characterized by the above-mentioned.   The light source device according to claim 1, wherein the light scattering structure is formed by containing a scattering agent inside the support portion.   The light source device according to claim 2, wherein the scattering agent is a white coloring agent.   The light source device according to claim 2, wherein the scattering agent is an achromatic or blue coloring agent.   The light source device according to claim 1, wherein the light scattering structure is formed by subjecting the support to a surface roughening treatment.   The light source device according to claim 5, wherein at least the outer surface of the support portion is subjected to a roughening treatment.   The light source device according to claim 5, wherein a roughening treatment is applied to the outer surface of the support portion, the upper surface of the support portion, and the inner surface of the fixed leg portion.   The light source device according to claim 1, wherein the light scattering structure is formed by applying a reflective paint to an outer surface of the support portion.   The light scattering structure is formed by processing the light scattering structure with respect to the outer surface of the support portion, the upper surface of the support portion, and the inner surface of the fixed leg portion. The light source device according to claim 1, characterized in that   The light source device according to claim 1, wherein the relative height of the holding frame portion to the upper surface of the quantum dot inclusion is 0.0 mm or more and 1.0 mm or less.   The light source device according to claim 1, wherein the relative height of the holding frame portion to the upper surface of the quantum dot inclusion is 0.5 mm.   The light source device according to claim 1, wherein the placement portion is made of a transparent resin.   A backlight device comprising a plurality of light source devices according to any one of claims 1 to 12. A display panel including a display unit for displaying an image;
The backlight apparatus according to claim 13, wherein the backlight apparatus is arranged to emit light to the back surface of the display panel.
And a light source control unit configured to control the light emission intensity of the blue light emitting element. A display panel including a display unit for displaying an image;
The backlight apparatus according to claim 13, wherein the backlight apparatus is arranged to emit light to the back surface of the display panel.
A light source control unit for controlling the light emission intensity of the blue light emitting element;
The display unit is logically divided into a plurality of areas,
Each light source device is provided to correspond to any of the plurality of areas,
The display device, wherein the light source control unit controls the light emission intensity of the blue light emitting element included in each light source device for each area.

Images