Patent Application
20190278134
The following disclosure relates to a backlight device, and more specifically to a backlight device that obtains white light by a combination of a blue light emitting diode (LED) and a wavelength conversion sheet and a display apparatus including the same.
In a liquid crystal display apparatus for displaying a color image, a color is displayed by an additive color mixture of three primary colors. Therefore, in a transmissive liquid crystal display apparatus, a backlight device capable of irradiating a liquid crystal panel with white light including a red component, a green component, and a blue component is required. In the related art, a cold cathode fluorescent tube called a CCFL has been widely adopted as a light source of the backlight device. However, in recent years, adoption of an LED is increasing from viewpoints of lower power consumption and easiness of luminance control. For example, the backlight device having a configuration using a red LED, a green LED, and the blue LED as a light source has been known in the related art.
In recent years, as a technique for realizing widening of color gamut, a technique of obtaining white light by combining the blue LED and a phosphor sheet is gaining attention. The phosphor sheet adopted in the technique functions as a wavelength conversion sheet that converts a wavelength of light emitted from the blue LED so as to obtain white light. In order to realize this, the phosphor sheet contains a phosphor (fluorochrome) that is excited by the light emitted from the blue LED and emits light. Specific examples of the phosphor sheet to be used include a phosphor sheet including a yellow phosphor, or a phosphor sheet including a green phosphor and a red phosphor. There is known a backlight device having a configuration using a white LED (white LED package) with a configuration in which the blue LED is covered with the yellow phosphor as a light source.
The following patent literature is known in relation to the present disclosure. In Japanese Unexamined Patent Application Publication No. 2008-134525, regarding a direct backlight device, a configuration in which a partition that partitions each light region of a light source is provided in order to prevent occurrence of light leakage from one region to another region, interference fringe, color unevenness, and unevenness in luminance is disclosed.
PTL 1: Japanese Unexamined Patent Application Publication No. 2008-134525
Meanwhile, regarding the liquid crystal display apparatus, reduction of power consumption has been a problem in the related art. In recent years, a liquid crystal display apparatus which performs local dimming processing for controlling luminance (light emission intensity) of the light source for each area where a screen is logically divided into a plurality of areas has been developed. In the local dimming processing, the luminance of the light source is controlled based on an input image in the corresponding area. Specifically, the luminance of each light source is obtained based on a maximum value and an average value of a target luminance (luminance corresponding to input gray scale value) of a pixel included in the corresponding area. In the area where the luminance of the light source is smaller than the original luminance, transmittance of each pixel is increased. Accordingly, the target display luminance can be obtained for each pixel. Furthermore, in recent years, development of HDR drive for displaying an extremely dynamic display range has recently become active. The local dimming processing is also used to realize the HDR drive.
However, when the local dimming processing is performed in the liquid crystal display apparatus including the backlight device having the configuration (
As shown in
As described above, when the partial lighting is performed, the color of the backlight light has a blue tinge in the vicinity of directly above the blue LED which is lighted up. When the partial lighting is performed within a particularly narrow range, the lighting area is irradiated with light having a blue tinge despite the fact that the lighting area should be irradiated originally with white light emitted as the backlight light. In this way, the white balance collapses.
Here, with reference to
As described above, the light emitted from one blue LED 93 reaches a surrounding region by repeating the reflection. In other words, some regions are not only irradiated with the light emitted from the blue LED 93 corresponding to the region, but also with the light of the reflection component of the light emitted from the blue LED 93 corresponding to surrounding region. In consideration of these points, the content (phosphor concentration) of phosphor in the phosphor sheet 95 is adjusted so that the backlight light becomes white light when the full lighting is performed.
However, when the partial lighting is performed, the amount of light having a yellow tinge arriving from other areas to the lighting area is smaller than when the full lighting is performed. As a result, the color of the backlight light appearing in the lighting area has a blue tinge and the white balance collapses. This becomes conspicuous as the range in which the partial lighting is performed is narrow. Since the light emitted from the blue LED 93 reaches the surrounding region by repeating the reflection, the non-lighting area is irradiated with light when the partial lighting is performed. At that time, the color of light gradually has a yellower tinge as the distance from the lighting area increases, so the color unevenness occurs.
Therefore, in order to prevent the leakage of light from each area to another area, it is conceivable to provide a partition between areas as disclosed, for example, in Japanese Unexamined Patent Application Publication No. 2008-134525. That is, as shown in
However, according to the configuration provided with the partition 99, for example, a shadow of the partition 99 is generated in a portion denoted by reference numeral 990 in
Therefore, an object of the following disclosure is to suppress the occurrence of the color unevenness and the collapsing of the white balance when adopting the backlight device having a configuration combining a blue LED and a wavelength conversion sheet.
According to a first aspect of the present disclosure, there is provided a backlight device of a direct type, including: a light source substrate on which a blue light emitting element that emits blue light is mounted; a wavelength conversion sheet that converts a wavelength of the light emitted from the blue light emitting element; and an optical member that is provided on the light source substrate side from the wavelength conversion sheet, receives the light emitted from the blue light emitting element, and emits the light to the wavelength conversion sheet side so that an emission angle is smaller than an incident angle.
According to a second aspect of the present disclosure, in the first aspect of the present disclosure, the optical member changes a progressing direction of the light emitted from the blue light emitting element in a direction perpendicular to the light source substrate.
According to a third aspect of the present disclosure, in the first aspect of the present disclosure, the optical member is a condenser lens.
According to a fourth aspect of the present disclosure, in the third aspect of the present disclosure, the condenser lens is a convex lens.
According to a fifth aspect of the present disclosure, in the third aspect of the present disclosure, the condenser lens is a Fresnel lens.
According to a sixth aspect of the present disclosure, in the third aspect of the present disclosure, the optical member has a structure that a plurality of blue light emitting elements and a plurality of condenser lenses are integrated in a one-to-one correspondence.
According to a seventh aspect of the present disclosure, in the first aspect of the present disclosure, the optical member is a prism.
According to an eighth aspect of the present disclosure, in the first aspect of the present disclosure, the optical member is a prism sheet in which a plurality of prism rows are formed.
According to a ninth aspect of the present disclosure, in the eighth aspect of the present disclosure, as the prism sheet, at least a first prism sheet and a second prism sheet in which a plurality of prism rows orthogonal to a plurality of prism rows formed in the first prism sheet are formed, are provided.
According to a tenth aspect of the present disclosure, in the eighth aspect of the present disclosure, the backlight device further includes a diffuser plate that is provided on the light source substrate side from the wavelength conversion sheet, and diffuses the light emitted from the blue light emitting element, in which the prism sheet is provided between the blue light emitting element and the diffuser plate.
According to an eleventh aspect of the present disclosure, in the eighth aspect of the present disclosure, the backlight device further includes a diffuser plate that is provided on the light source substrate side from the wavelength conversion sheet, and diffuses the light emitted from the blue light emitting element, in which the prism sheet is provided between the diffuser plate and the wavelength conversion sheet.
According to a twelfth aspect of the present disclosure, in the first aspect of the present disclosure, the optical member is a light guide plate in which reflection materials having surfaces perpendicular to the light source substrate are provided at equal intervals.
According to a thirteenth aspect of the present disclosure, there is provided a display apparatus including: a display panel that includes a display unit which displays an image; the backlight device according to the first aspect of the present disclosure that is disposed so as to irradiate a back surface of the display panel with light; and a light source control unit that controls light emission intensity of the blue light emitting element.
According to a fourteenth aspect of the present disclosure, in the thirteenth aspect of the present disclosure, the display unit is logically divided into a plurality of areas, one or a plurality of blue light emitting elements are associated with each area, and the light source control unit controls the light emission intensity of the blue light emitting element for each area.
According to a fifteenth aspect of the present disclosure, in the fourteenth aspect of the present disclosure, the light emitted from the blue light emitting element associated with each area is applied up to next neighboring area through the optical member.
According to the first aspect of the present disclosure, in the backlight device having a configuration combining the blue light emitting element and the wavelength conversion sheet, the optical member that receives the light emitted from the blue light emitting element and emits the light to the wavelength conversion sheet side so that an emission angle is smaller than an incident angle is provided. Therefore, the light progressing from the light source substrate side to the wavelength conversion sheet side becomes light having directivity. Accordingly, it is possible to suppress the light emitted from the blue light emitting element in a certain region from reaching surrounding region. Therefore, when full lighting is performed, the entire screen is irradiated with the backlight light having uniform chromaticity, and when partial lighting is performed, the backlight light having uniform chromaticity is applied within the lighting range. As a result, the occurrence of color unevenness and collapsing of white balance is suppressed. Unlike the configuration in which the partition is provided around the blue light emitting element, unevenness in luminance due to the influence of the shadow of the partition does not occur.
According to the second aspect of the present disclosure, since parallel light is emitted from the optical member, mixing of light from the plurality of blue light emitting elements is effectively suppressed. Therefore, the occurrence of color unevenness and collapsing of white balance can be effectively suppressed.
According to the third aspect of the present disclosure, since it is sufficient to prepare the condenser lens which is relatively easy to obtain, it is possible to realize the backlight device capable of suppressing the occurrence of color unevenness and collapsing of white balance at low cost.
According to the fourth aspect of the present disclosure, the same effect as the third aspect of the present disclosure can be obtained.
According to the fifth aspect of the present disclosure, it is possible to reduce the thickness and weight of the backlight device.
According to the sixth aspect of the present disclosure, it is easy to attach the optical member to the backlight device.
According to the seventh aspect of the present disclosure, the same effect as the first aspect of the present disclosure can be obtained.
According to the eighth aspect of the present disclosure, the same effect as the first aspect of the present disclosure can be obtained.
According to the ninth aspect of the present disclosure, light spreading in directions orthogonal to each other is suppressed by the two prism sheets. Therefore, it is possible to effectively suppress the light emitted from the blue light emitting element in a certain region from reaching surrounding region, and the occurrence of color unevenness and collapsing of white balance can be effectively suppressed.
According to the tenth aspect of the present disclosure, the same effect as the eighth aspect of the present disclosure can be obtained.
According to the eleventh aspect of the present disclosure, the same effect as the eighth aspect of the present disclosure can be obtained.
According to the twelfth aspect of the present disclosure, the same effect as the first aspect of the present disclosure can be obtained.
According to the thirteenth aspect of the present disclosure, in the display apparatus adopting the backlight device having a configuration combining the blue light emitting element and the wavelength conversion sheet, the occurrence of color unevenness and collapsing of white balance is suppressed.
According to the fourteenth aspect of the present disclosure, since the light emission intensity of the light source (blue light emitting element) can be independently controlled, low power consumption can be achieved. Moreover, it is possible to expand the dynamic range by causing the light source to emit light intensively at a high gray scale portion with high light emission intensity.
According to the fifteenth aspect of the present disclosure, light emitted from the blue light emitting element is mixed between adjacent areas. Therefore, the occurrence of display unevenness due to variations in the light source (blue light emitting element) is suppressed.
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.
Regarding
Meanwhile, as the TFT 40 in the display unit 410, for example, an oxide TFT (a thin film transistor using an oxide semiconductor for a channel layer) can be adopted. More specifically, a TFT in which a channel layer is formed of 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 (hereinafter referred to as “In—Ga—Zn—O-TFT”) can be adopted as the TFT 40. Adoption of such an In—Ga—Zn—O-TFT provides effects such as high definition and low power consumption. Alternatively, a transistor using an oxide semiconductor other than In—Ga—Zn—O (indium gallium zinc oxide) as a channel layer can be adopted. For example, the same effect can be obtained also in a case where a transistor using an oxide semiconductor including at least one of indium, gallium, zinc, copper (Cu), silicon (Si), tin (Sn), aluminum (Al), calcium (Ca), germanium (Ge), and lead (Pb) as a channel layer is adopted. Note that, the present disclosure does not exclude the use of TFTs other than oxide TFTs.
Next, the operation of the components shown in
The gate driver 200 repeats applying active scanning signals G(1) to G(m) to each of the gate bus lines GL1 to GLm with one vertical scanning period as a cycle based on the gate start pulse signal GSP and the gate clock signal GCK sent from the display control circuit 100.
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 applies the driving video signals S(1) to S(n) to the source bus lines SL1 to SLn. At this time, in the source driver 300, the digital video signal DV indicating the voltage to be applied to each of the source bus lines SL1 to SLn is 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 voltage is simultaneously applied to all the source bus lines SL1 to SLn as the driving video signals S(1) to S(n).
The light source control unit 500 controls the luminance (light emission intensity) of the light source in the backlight device 600 based on the light source control signal BS sent from the display control circuit 100. Accordingly, the backlight device 600 irradiates the back surface of the liquid crystal panel 400 with backlight light. In the present embodiment, local dimming processing is performed, which will be described later.
As described above, the scanning signals G(1) to G(m) are applied to the gate bus lines GL1 to GLm, the driving video signals S(1) to S(n) are applied to the source bus lines SL1 to SLn, and the luminance of the light source in the backlight device 600 is controlled, whereby an image corresponding to the image signal DAT sent from the outside is displayed on the display unit 410.
The backlight device 600 includes a chassis 61, an LED substrate 62, a plurality of the blue LEDs 63, a diffuser plate 64, a phosphor sheet 65, an optical sheet 66, and a convex lens 67 as a condenser lens. The chassis 61 supports the LED substrate 62 and the like. The LED substrate 62 is, for example, a metal substrate and mounts the plurality of blue LEDs 63. A reflection sheet 621 is attached to the surface of the LED substrate 62 in order to enhance the utilization efficiency of the light emitted from the blue LED 63. The blue LED 63 is a light source of the backlight device 600, and emits blue light. The convex lens 67 is disposed above each blue LED 63. The convex lens 67 changes a progressing direction of the light emitted from the blue LED 63 in a direction perpendicular to the LED substrate 62. In the present embodiment, an optical member that receives the light emitted from a blue light emitting element (blue LED 63) and emits the light to the wavelength conversion sheet (phosphor sheet 65) side so that an emission angle becomes smaller than the incident angle is realized by the convex lens 67. The diffuser plate 64 is disposed above the convex lens 67. The diffuser plate 64 diffuses the light emitted from the blue LED 63 so that the backlight light becomes planarly uniform light. The phosphor sheet 65 is disposed above the diffuser plate 64. The phosphor sheet 65 converts the wavelength of the light emitted from the blue LED 63 so that the backlight light emitted from the backlight device 600 becomes white light. In order to realize this, the phosphor sheet 65 is provided with a yellow phosphor (alternatively, green phosphor emitting green light and red phosphor emitting red light) excited by light emitted from the blue LED 63 to emit yellow light. The optical sheet 66 is disposed above the phosphor sheet 65. Generally, the optical sheet 66 is composed of a plurality of sheets. Each of the plurality of sheets has a function of diffusing light, a condensing function, a function of enhancing light utilization efficiency, and the like.
In the present embodiment, a plurality of the convex lenses 67 are integrated by a single lens substrate 675. However, the present disclosure is not limited thereto, and as shown in
In the present embodiment, the display unit 410 for displaying an image is logically (not physically) divided into a plurality of areas (area to be the smallest unit for controlling light source) as shown in
In the liquid crystal display apparatus according to the present embodiment, the above-described local dimming processing is performed. That is, the display unit 410 is logically divided into a plurality of areas as shown in
Here, an example of the procedure of the local dimming processing will be described with reference to
First, the 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 the luminances of (sp×sq) pixels (s is an integer of 2 or more) (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, for each of the (p×q) areas, the local dimming processing unit obtains a maximum value Ma of the luminances of the pixels in the area and an average value Me of the luminances of the pixels in the area (step S14). Next, based on the maximum value Ma, the average value Me, and the like obtained in step S14, the local dimming processing unit obtains (p×q) light emission luminances of the light source (blue LED 63) corresponding to each area (step S15).
Next, the local dimming processing unit obtains (tp×tq) display luminances (t is an integer of 2 or more) based on (p×q) light emission luminances obtained in step S15 (step S16). Next, the local dimming processing unit obtains backlight luminance data including (m×n) display luminances by performing linear interpolation processing on (tp×tq) display luminances (step S17). The backlight luminance data represents the luminances of light incident on (m×n) pixels when all the light sources (blue LEDs 63) emit light with the light emission luminance obtained in step S15. Next, the local dimming processing unit divides the luminances of (m×n) pixels included in the input image by (m×n) display luminances included in the backlight luminance data, respectively, and obtains light transmittance in (m×n) pixels (step S18). Finally, the local dimming processing unit outputs the digital video signal DV corresponding to the data representing the light transmittance obtained in step S18 and the light source control signal BS for causing the light source (blue LED 63) corresponding to each area to emit light with the light emission luminances obtained in step S15 (step S19).
By performing the local dimming processing as described above, light having a luminance (light emission intensity) which is different for each area is emitted as schematically shown in
Next, the condenser lens used in the present embodiment for changing the progressing direction of the light emitted from the blue LED 63 will be described in detail. In the present embodiment, as described above, the convex lens 67 is used as a condenser lens.
For example, as shown in
Since the light emitted from the blue LED 63 in each area does not reach other areas, on the contrary, unlike the case in the related art, each area is not irradiated with the light of the reflection component of the light emitted from other areas. In consideration of this point, the content (phosphor concentration) of the phosphor in the phosphor sheet 65 is adjusted.
According to the present embodiment, in the backlight device 600 having a configuration combining the blue LED 63 and the phosphor sheet 65, a convex lens 67 as a condenser lens is provided above each blue LED 63. Therefore, the light emitted from the blue LED 63 becomes light having directivity. More specifically, by disposing appropriately designed convex lenses 67 at appropriate positions, the light emitted from the blue LED 63 becomes light perpendicular to the LED substrate 62 and is applied to the phosphor sheet 65. Accordingly, it is possible to suppress the light emitted from the blue LED 63 in each area from reaching other areas. In other words, the light emitted from the blue LED 63 in other areas hardly reaches each area. Therefore, when full lighting is performed, the entire screen is irradiated with the backlight light having uniform chromaticity, and when partial lighting is performed, the backlight light having uniform chromaticity is applied within the lighting range. As a result, the occurrence of color unevenness and collapsing of white balance is suppressed. As described above, according to the present embodiment, in the liquid crystal display apparatus adopting the backlight device 600 having a configuration combining the blue LED 63 and the phosphor sheet 65, the occurrence of color unevenness and collapsing of white balance is suppressed.
As shown in
Furthermore, in the liquid crystal display apparatus according to the present embodiment, the local dimming processing is performed. That is, the light emission intensity of the blue LED 63 is controlled for each area.
Therefore, low power consumption can be achieved. In addition, it is possible to expand the dynamic range by causing the blue LED 63 to emit light intensively at a high gray scale portion with high light emission intensity.
Hereinafter, modification examples of the first embodiment will be described.
According to the first embodiment, since the light emitted from the blue LEDs 63 in other areas hardly reaches each area, the chromaticity of the backlight light becomes uniform, and the occurrence of color unevenness and collapsing of white balance is suppressed. However, when the light source (blue LED 63) has variations (for example, manufacturing variations), display unevenness due to the variations can occur because the light is hardly mixed between the areas.
Therefore, in the present modification example, a convex lens 67 designed to irradiate up to the next neighboring area with the light emitted from the blue LED 63 in each area is disposed above each blue LED 63. Accordingly, as shown in
In the present modification example, the light emitted from the blue LED 63 in each area is applied up to the next neighboring area, but the present disclosure is not limited thereto. Within a range in which the occurrence of color unevenness caused by the light gradually having a yellower tinge due to repetition of reflection is suppressed, two or more preceding areas may be irradiated with the light emitted from the blue LED 63 in each area.
In the first embodiment, the convex lens 67 is adopted as the condenser lens, but the present disclosure is not limited thereto. In the present modification example, a Fresnel lens 671 having a cross section with a shape as shown in
In the present modification example, the Fresnel lens 671 is disposed so that the position of the blue LED 63 on the LED substrate 62 is at the focal position. Accordingly, as shown in
Since the Fresnel lens 671 is a lens thinner than the convex lens 67, according to the present modification example, it is possible to make the backlight device thinner and lighter.
In the first embodiment, as shown in
A second embodiment of the present disclosure will be described. In the following description, points different from the first embodiment will be mainly described, and description of points similar to those in the first embodiment will be omitted.
The prism sheet 68 includes a sheet substrate 683 and a plurality of prism rows 684 having a triangular cross section. The prism sheet 68 is disposed above the blue LED 63. Specifically, the prism sheet 68 is disposed between the LED substrate 62 on which the plurality of blue LEDs 63 are mounted and the diffuser plate 64. As can be seen from
The prism refracts light with a different refractive index depending on the (light) wavelength. Therefore, in the present embodiment, the prism sheet 68 is disposed in consideration of the refractive index of the wavelength of the blue light. Accordingly, the light emitted from the blue LED 63 becomes parallel light after passing through the prism sheet 68 and is applied to the diffuser plate 64 as shown in
In the present embodiment, similarly to the first embodiment, in the liquid crystal display apparatus adopting the backlight device 600 having a configuration combining the blue LED 63 and the phosphor sheet 65, the occurrence of color unevenness and collapsing of white balance is suppressed.
Hereinafter, modification examples of the second embodiment will be described.
According to the present modification example, the light emitted from the diffuser plate 64 to the liquid crystal panel 400 side becomes parallel light after passing through the prism sheet 68 and is applied to the phosphor sheet 65. Accordingly, it is possible to suppress the light emitted from the blue LED 63 in each area from reaching other areas.
According to the present modification example, spreading of light in the direction in which the gate bus line GL extends is suppressed in one of the two prism sheets 68a and 68b, and spreading of light in the direction in which the source bus line SL extends is suppressed in the other of the two prism sheets 68a and 68b. Accordingly, it is possible to effectively suppress the light emitted from the blue LED 63 in each area reaching other areas.
According to the present modification example, the light emitted from the blue LED 63 becomes parallel light after passing through the prism 681 and is applied to the diffuser plate 64. Accordingly, it is possible to suppress the light emitted from the blue LED 63 in each area from reaching other areas.
By providing the above-described light guide plate (light guide plate designed so as not to spread light) 69 above the blue LED 63, the light emitted from the blue LED 63 progresses from the LED substrate 62 side to the liquid crystal panel 400 side while repeating the reflection inside the light guide plate 69 as shown in
In the present embodiment, similarly to the first embodiment, in the liquid crystal display apparatus adopting the backlight device 600 having a configuration combining the blue LED 63 and the phosphor sheet 65, the occurrence of color unevenness and collapsing of white balance is suppressed.
In each of the above-described embodiments (including modification examples), the phosphor sheet 65 is used as a wavelength conversion sheet for obtaining white light from blue light, but the present disclosure is not limited thereto. A quantum dot sheet can also be used in place of the phosphor sheet 65. For example, it is also possible to use a quantum dot sheet including 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. By using such a quantum dot sheet, the half value width of the green light and the red light can be narrowed. Therefore, by combining a backlight device having such a configuration using a quantum dot sheet and a liquid crystal panel having a configuration using a high-density color filter, widening of the color gamut of the liquid crystal display apparatus is realized.
In each of the above-described embodiments, the local dimming processing is performed, but the present disclosure is not limited thereto. The present disclosure can also be applied to a liquid crystal display apparatus not subjected to the local dimming processing.
Furthermore, in each of the above-described embodiments, a liquid crystal display apparatus has been described as an example, but the present disclosure is not limited thereto. The present disclosure can also be applied to a display apparatus other than the liquid crystal display apparatus as long as it is a display apparatus using a direct backlight device.
This application claims priority based on Japanese Patent Application No. 2016-100101, which was entitled “backlight device and display device using same” and filed on May 19, 2016, the contents of which, are incorporated herein by reference, in their entirety.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2016-100101 | May 2016 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2017/014765 | 4/11/2017 | WO | 00 |
