CN111308785A - Color conversion display device and manufacturing method thereof - Google Patents
Color conversion display device and manufacturing method thereof Download PDFInfo
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- CN111308785A CN111308785A CN202010228669.1A CN202010228669A CN111308785A CN 111308785 A CN111308785 A CN 111308785A CN 202010228669 A CN202010228669 A CN 202010228669A CN 111308785 A CN111308785 A CN 111308785A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133553—Reflecting elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Polarising Elements (AREA)
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Abstract
The application discloses a color conversion display device and a method of manufacturing the same, the display device including: the first substrate and the second substrate are oppositely arranged; the blue light backlight source is positioned between the first substrate and the second substrate; the color conversion layer is positioned on one side, far away from the second substrate, of the blue light backlight source; the light reflection layer is positioned on one side of the color conversion layer, which is far away from the blue light backlight source, and is used for reflecting the incompletely absorbed blue light of the color conversion layer, and the light reflection layer comprises a cholesterol liquid crystal layer with optical activity; and the alignment layer is positioned between the light reflection layer and the first substrate, and horizontally aligns liquid crystal molecules in the cholesterol liquid crystal layer compared with the first substrate or the second substrate, so that the display device improves the utilization rate of blue light, further improves the brightness of a display, omits the design of a color filter, simplifies the manufacturing process and saves the cost.
Description
Technical Field
The present disclosure relates to display technologies, and particularly to a color conversion display device and a method for manufacturing the same.
Background
Quantum dots are semiconductor particles of nanometer diameter that excite light of a characteristic wavelength in the presence of an electric field or light. The quantum dots may emit red, green, or blue light by adjusting the particle diameter of the quantum dots. The quantum dot has the characteristics of narrow luminous spectrum and high color saturation, can be used as a light conversion layer to be applied to an OLED or a Micro LED, and solves the problems of low full-color yield of the OLED and difficult full-color of the Micro LED. However, the quantum dots do not completely absorb the blue light, and the leaked blue light needs to be filtered by a color filter with a corresponding color, so that the blue light is wasted.
Disclosure of Invention
In order to solve the above problems, the present application aims to provide a color conversion display device capable of improving the utilization rate of blue light and a method of manufacturing the same.
The present application provides a color conversion display device including: the first substrate and the second substrate are oppositely arranged; the blue light backlight source is positioned between the first substrate and the second substrate; the color conversion layer is positioned on one side, far away from the second substrate, of the blue light backlight source; the light reflection layer is positioned on one side of the color conversion layer, which is far away from the blue light backlight source, and is used for reflecting the incompletely absorbed blue light of the color conversion layer, and the light reflection layer comprises a cholesterol liquid crystal layer with optical activity; and the alignment layer is positioned between the light reflection layer and the first substrate and horizontally aligns liquid crystal molecules in the cholesterol liquid crystal layer compared with the first substrate or the second substrate.
In some embodiments, the light reflection layer includes a right-handed cholesterol liquid crystal layer and a left-handed cholesterol liquid crystal layer which are stacked.
In some embodiments, the color conversion layer includes a plurality of pixel units including a blue pixel unit, a red pixel unit, and a green pixel unit, and the cholesteric liquid crystal layer is disposed corresponding to the red pixel unit and the green pixel unit.
In some embodiments, the color conversion display device further includes a circular polarizer on a side of the first substrate away from the light reflection layer, the circular polarizer being configured to absorb blue light leaked from the backlight.
In some embodiments, the light reflective layer comprises a cholesteric liquid crystal layer having a first optical activity, and the circular polarizer is configured to absorb blue light having a second optical activity opposite to the first optical activity.
In some embodiments, the light reflective layer includes a cholesteric liquid crystal layer having a first optical activity and a second optical activity, and the circular polarizer absorbs blue light having the first optical activity or the second optical activity.
The application also provides a preparation method of the color conversion display device, which comprises the following steps:
providing a first substrate and a second substrate; forming an alignment layer on the first substrate;
forming a light reflecting layer on the alignment layer, wherein the light reflecting layer comprises at least one optically active cholesterol liquid crystal layer, and liquid crystal molecules in the cholesterol liquid crystal layer are horizontally aligned compared with the first substrate or the second substrate;
forming a color conversion layer on the light reflection layer;
attaching a blue light backlight source on the color conversion layer;
and attaching the second substrate to the blue light backlight source.
In some embodiments, the forming step of the light reflective layer includes coating a cholesteric liquid crystal to which an optical rotatory agent having a specific chirality and a specific helical pitch and a photoinitiator are added on the alignment layer, and exposing to light to form the optically active cholesteric liquid crystal layer; and removing the unreacted cholesterol liquid crystal after exposure, and depositing a flat layer to form a light reflecting layer.
In some embodiments, the color conversion layer includes a plurality of pixel units including a blue pixel unit, a red pixel unit and a green pixel unit, and only the cholesteric liquid crystals corresponding to the red pixel unit and the green pixel unit are exposed through a mask.
In some embodiments, the manufacturing method further includes attaching a circular polarizer to a side of the first substrate away from the light reflection layer.
Compared with the prior art, the method has the following advantages and technical effects:
the application provides a color conversion display device combines the color conversion layer with the light reflection layer that forms through the accumulation layer of dextrorotation and levogyration cholesterol liquid crystal layer, can not absorb complete blue light reflection with the color conversion layer and arouse quantum dot to demonstrate red green blue color respectively, reaches the purpose of colored demonstration, has improved the blue light utilization ratio, and then promotes the luminance of display, has left out the design of colored light filter, has simplified the processing procedure, has practiced thrift the cost.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic view showing the structure of a color conversion display device of an exemplary embodiment of the present application.
Fig. 2 is a flow chart showing steps of a method of manufacturing a color conversion display device of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For the sake of clarity, the drawings schematically show the width, size, thickness, shape, and the like as compared with the actual embodiment, but these are merely examples. In addition, although the drawings appropriately omit parts that are not necessary for explaining the effects of the present application, the omitted parts do not limit the scope of the present application. In addition, in order to make the drawings concise and easy to understand, components having the same structure or function in some of the drawings are only schematically shown, or only one of them is shown.
Fig. 1 is a schematic view showing the structure of a color conversion display device of an exemplary embodiment of the present application. As shown in fig. 1, the color conversion display device includes a first substrate 10 and a second substrate 20 disposed oppositely; a blue backlight 30 between the first substrate 10 and the second substrate 20; the color conversion layer 40 is located on one side of the blue light backlight source 30 away from the second substrate 20, and is used for performing color conversion on the blue light emitted by the blue light backlight source 30; a light reflection layer 50 located on a side of the color conversion layer 40 away from the blue light backlight source 30, for reflecting the incompletely absorbed blue light by the color conversion layer 40, wherein the light reflection layer 50 includes a cholesteric liquid crystal layer 51 having optical activity; an alignment layer 60 disposed between the light reflective layer 50 and the first substrate 10 for aligning the liquid crystal molecules in the cholesteric liquid crystal layer 51 horizontally with respect to the first substrate 10 or the second substrate 20.
In some embodiments, the light reflecting layer 50 includes a right-handed cholesteric liquid crystal layer and a left-handed cholesteric liquid crystal layer stacked, and in another embodiment, only the right-handed cholesteric liquid crystal layer or the left-handed cholesteric liquid crystal layer may be included. The right-handed cholesterol liquid crystal layer can reflect left-handed circularly polarized light and allow right-handed circularly polarized light to penetrate through; the left-handed chiral cholesteric liquid crystal reflects right-handed circularly polarized light and allows left-handed circularly polarized light to pass through. In the present exemplary embodiment, a circular polarizer 70 is attached to a side of the first substrate 10 away from the light reflection layer 50, and is used for absorbing left-handed circularly polarized light or right-handed circularly polarized light which is transmitted or leaked, so as to prevent blue light from leaking out, and improve the brightness of the display. The reflection rate of the light reflecting layer 50 can be greatly improved by stacking the right-handed cholesteric liquid crystal layer and the left-handed cholesteric liquid crystal layer.
The color conversion layer 40 includes a plurality of pixel units including a blue pixel unit 41, a red pixel unit 42, and a green pixel unit 43, and the cholesteric liquid crystal layer 51 is disposed corresponding to the red pixel unit 42 and the green pixel unit 43. In some embodiments, the blue pixel cell 41 may be a transparent pixel cell, a blue quantum dot, or a light-transmissive hole; the light holes are hollow holes perpendicular to the light reflecting layer and penetrating through the color conversion layer 40, and are used for transmitting the blue light emitted by the blue light backlight source 30. In some embodiments, the blue pixel unit 41, the red pixel unit 42 and the green pixel unit 43 are arranged in a horizontal sequence, and the cholesteric liquid crystal layer 51 is only disposed on one side of the red pixel unit 42 and the green pixel unit 43 away from the blue backlight 30. In some embodiments, the red pixel unit 42 includes a red quantum dot material, the green pixel unit 43 includes a green quantum dot material, the red pixel unit 42 and the green pixel unit 43 respectively absorb light reflected by the cholesteric liquid crystal layer 51, convert the light into light with different wavelengths, and emit the light, and the cholesteric liquid crystal layer 51 has a high light transmittance in a wavelength band except for a blue reflection band, so that the light efficiency of green light and red light is not reduced.
Fig. 2 is a flowchart showing steps of a method of manufacturing the color conversion display device of the present application. As shown in fig. 2, the method for manufacturing the quantum dot color conversion display device includes the steps of: providing a first substrate 10 and a second substrate 20, wherein the first substrate 10 and the second substrate 20 may be transparent substrates such as glass substrates; coating an alignment layer 60 on the first substrate 10; then coating a cholesterol liquid crystal added with a photoinitiator, a specific chiral and a specific spiral distance optical rotatory agent on the alignment layer 60, exposing by using a photomask to form a cholesterol liquid crystal layer 51, removing the unreacted cholesterol liquid crystal after exposure, and depositing a flat layer 52 to form a light reflection layer 50; in some embodiments, exposing the cholesterol liquid crystal corresponding to the red pixel unit and the green unit; forming a color conversion layer 40 on the light reflection layer 50, in some embodiments, printing quantum dots on the light reflection layer 50 corresponding to the pixel units to form a blue pixel unit 41, a red pixel unit 42, and a green pixel unit 43, respectively; a blue light backlight 30 is attached to the color conversion layer 40, the blue light backlight 30 may be a blue OLED or a blue Micro LED, and the second substrate 20 is attached to the blue light backlight 30. In some embodiments, a circular polarizer 70 is attached to the first substrate 10 on the side away from the light reflecting layer 50.
The color conversion display device disclosed by the application combines the color conversion layer through the accumulation layer of the dextrorotation and/or levorotatory cholesterol liquid crystal layer, the blue light which cannot be completely absorbed by the color conversion layer is reflected to excite the quantum dots again to respectively display red and green colors, and part of light holes transmit the blue light, so that the purpose of color display is achieved, the utilization rate of the blue light is improved, the brightness of the display is further improved, the design of a color filter is omitted, and the manufacturing process is simplified.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present application, and it is obvious to those skilled in the art that various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (10)
1. A color conversion display device, characterized in that the color conversion display device comprises:
the first substrate and the second substrate are oppositely arranged;
the blue light backlight source is positioned between the first substrate and the second substrate;
the color conversion layer is positioned on one side, far away from the second substrate, of the blue light backlight source;
the light reflection layer is positioned on one side of the color conversion layer, which is far away from the blue light backlight source, and is used for reflecting the incompletely absorbed blue light of the color conversion layer, and the light reflection layer comprises a cholesterol liquid crystal layer with optical activity;
and the alignment layer is positioned between the light reflection layer and the first substrate, so that liquid crystal molecules in the cholesterol liquid crystal layer are horizontally aligned compared with the first substrate or the second substrate.
2. The color conversion display device according to claim 1, wherein the light reflection layer comprises a right-handed cholesteric liquid crystal layer and a left-handed cholesteric liquid crystal layer which are stacked.
3. The color conversion display device according to claim 1, wherein the color conversion layer comprises a plurality of pixel cells including a blue pixel cell, a red pixel cell, and a green pixel cell, and wherein the cholesteric liquid crystal layer is provided in correspondence with the red pixel cell and the green pixel cell.
4. The color conversion display device according to claim 1, further comprising a circular polarizer on a side of the first substrate remote from the light reflection layer, the circular polarizer being configured to absorb blue light leaked from the backlight.
5. The color conversion display device according to claim 1, wherein the light reflecting layer comprises a cholesteric liquid crystal layer having a first optical rotation, and the circular polarizer is configured to absorb blue light having a second optical rotation opposite to the first optical rotation.
6. The color conversion display device according to claim 1, wherein the light reflecting layer comprises a cholesteric liquid crystal layer having a first optical activity and a second optical activity, and the circular polarizer is configured to absorb blue light having the first optical activity or the second optical activity.
7. A method of making a color conversion display device, comprising the steps of:
providing a first substrate and a second substrate; forming an alignment layer on the first substrate;
forming a light reflecting layer on the alignment layer, wherein the light reflecting layer comprises at least one optically active cholesterol liquid crystal layer, and liquid crystal molecules in the cholesterol liquid crystal layer are horizontally aligned compared with the first substrate or the second substrate;
forming a color conversion layer on the light reflection layer;
attaching a blue light backlight source on the color conversion layer;
and attaching the second substrate to the blue light backlight source.
8. The manufacturing method according to claim 7, wherein the forming step of the light reflective layer comprises coating a cholesteric liquid crystal to which an optical rotatory agent having a specific chirality and helical pitch and a photoinitiator are added on the alignment layer, and exposing the cholesteric liquid crystal to form the optically active cholesteric liquid crystal layer; and removing the unreacted cholesterol liquid crystal after exposure, and depositing a flat layer to form a light reflecting layer.
9. The method of claim 8, wherein the color conversion layer comprises a plurality of pixel units, the plurality of pixel units comprise a blue pixel unit, a red pixel unit and a green pixel unit, and the cholesteric liquid crystals corresponding to the red pixel unit and the green pixel unit are exposed through a mask.
10. The method according to claim 7, further comprising attaching a circular polarizer to the first substrate on a side thereof remote from the light-reflecting layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010228669.1A CN111308785A (en) | 2020-03-27 | 2020-03-27 | Color conversion display device and manufacturing method thereof |
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| CN202010228669.1A CN111308785A (en) | 2020-03-27 | 2020-03-27 | Color conversion display device and manufacturing method thereof |
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| WO2022134309A1 (en) * | 2020-12-21 | 2022-06-30 | 深圳扑浪创新科技有限公司 | Display device, manufacturing method therefor and use thereof |
| US20230212459A1 (en) * | 2021-12-30 | 2023-07-06 | Industrial Technology Research Institute | Light color conversion material and light color conversion ink |
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| US20230212459A1 (en) * | 2021-12-30 | 2023-07-06 | Industrial Technology Research Institute | Light color conversion material and light color conversion ink |
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