Who owns the patents for quantum dot display technology at present?
Sep 15, 2021
1. Improvement of quantum dot display technology
Quantum dot display technology has attracted more and more researchers' attention and favor because of its excellent performance in color expression. Quantum dots, also known as nanocrystals, are composed of a finite number of atoms, and the dimensions in three dimensions are all on the order of nanometers.
Quantum dots are generally spherical or quasi-spherical, and are made of semiconductor materials and are stable nanoparticles with a diameter of 2-20 nm.
As a novel semiconductor nanomaterial, quantum dots have many unique optical properties, such as high luminous efficiency, narrow emission spectrum, and adjustable emission spectrum. These properties are important prerequisites for the application of quantum dots in display devices.
Quantum dot display technology is still in the stage of continuous research and development. Although there are some corresponding products on the market, the popularity is not enough, especially in terms of material types, packaging methods and costs. There is still a lot of room for improvement.
The following will introduce the improvements made by several major companies at home and abroad in quantum dot display technology, in order to promote industry exchanges, promote technological progress, and further improve the level of independent innovation technology.
Samsung Electronics Co., Ltd.
An improvement plan is proposed for the glass container rupture due to resin expansion or gas generation when the glass capillary is used to encapsulate the quantum dot material (Publication No.: CN107369754A, Publication Date: 20171121): A light converter, its manufacturing method, The light source module and the backlight unit, the light conversion layer containing quantum dots is located on the substrate, the first inorganic layer and the first organic layer are sequentially arranged or formed on the light conversion layer, and the first inorganic layer covers the entire upper surface of the light conversion layer and On all sides, the light conversion layer is not exposed to the outside, reducing or effectively preventing the penetration of oxygen or moisture through the gap that reduces the luminous efficiency of the light conversion layer, making it have excellent durability and blocking oxygen and moisture characteristics , Formability and light efficiency.
Samsung Electronics Co., Ltd.
(Publication number: CN106353921A, publication date: 20170125) discloses a reflective plate, a backlight unit and a display device. The backlight unit includes an optical plate, a quantum dot sheet, a diffuser plate, a reflective plate and a light-emitting part, and the quantum dot sheet covers the diffuser plate. Setting, arranged in the quantum dot sheet is arranged with multiple quantum dots of different sizes, which can emit red, green and blue base light. The red quantum dots and green quantum dots are arranged appropriately to make the quantum dot sheet emit white light or Similar to the light.
American 3M Innovation Co., Ltd.
A backlight system (publication number: CN106575057A, publication date: 20170419) comprising a down-conversion film element is disclosed, including a blue LED, a down-conversion film element, wherein the down-conversion film element is a quantum dot film, a supporting structure, and The support structure includes a blue light absorber/red light and filter reflector on at least its edge adjacent to the down-conversion film element to overcome the problem of color unevenness caused by insufficient red and green light at the edge of the display .
Fujifilm Corporation
Disclosed is a laminated body containing sub-dots, a method of manufacturing the same, and a backlight unit (publication number: CN106457756A, publication date: 20140222), which is achieved by including a thixotropic agent in a composition containing sub-dots as a coating liquid Low viscosity at high shear (representative value 500s-1) used to uniformly obtain the film thickness of the coating film, and high at low shear (representative value 1s-1) used to uniformly bond the substrate Adhesive, so as to obtain a layer with a uniform coating film content without coating streaks, and the coating film is sandwiched between the first substrate and the second substrate to be laminated, and the coating film is cured to form the content The film thickness unevenness of the laminate containing sub-dots after the layer of dots is small.
Fujifilm Corporation
A wavelength conversion component, a backlight unit with the wavelength conversion component, and a liquid crystal display device (publication number: CN106716188A, publication date: 20170524) are disclosed. Starting from improving the optical performance of the base film of the quantum dot wavelength conversion layer, the substrate film The absorption rate of 450nm light measured by the integrating sphere is less than 0.9%, and the total light transmittance is less than 92%. According to this structure, a wavelength conversion member with less light loss can be provided.
Korea Corning Precision Materials Co., Ltd.
Disclosed is a substrate for color conversion, its manufacturing method, and a display device including the same (publication number: CN107077028A, publication date: 20170818). A quantum dot coating layer is provided on one of the light-emitting surface of a light guide plate and a thin glass plate. Between the surfaces, between the thin glass plate and the light guide plate, a sealant and moisture absorber are used to isolate the quantum dot coating layer from external oxygen and moisture. In addition, the quantum dot coating layer is also provided with corresponding patterns so that the light is The additional conversion wavelength improves the color conversion efficiency.
BOE Technology Group Co., Ltd.
A quantum dot enhancement film and its preparation method, backlight and display device (publication number: CN107634133A, publication date: 20180126) are disclosed, and a quantum dot enhancement film is provided, including a matrix layer and functions formed on the matrix layer The functional layer includes a limit layer and a quantum dot material layer alternately stacked along the thickness direction of the quantum dot enhancement film, and the limit layer includes a hydrotalcite material and/or a hydrotalcite-like material. Therefore, the quantum dot enhancement film is not prone to the aggregation of quantum dot materials, and it is not prone to fluorescence quenching.
Shenzhen TCL New Technology Co., Ltd.
A side-lit backlight module and display device (publication number: CN107329201A, publication date: 20171107) is disclosed. The reflective film surface is coated with a wavelength conversion layer mixed with a quantum dot material and UV glue on the bottom surface of the light guide plate. Compared with packaging quantum films or quantum tubes, it saves quantum dot materials and manufacturing costs.
U.S. QD Optics Co., Ltd.
A light mixing chamber (publication number: CN104169786A, publication date: 20141126) for use with a light guide plate is disclosed, including a housing, the housing has a channel formed in the housing, and the channel is exposed to the outside of the housing; , Formed in the housing; an opening formed in the housing and connecting the chamber to the channel; LED light source; optical member filled with quantum dots; light emitted from the LED passes through the opening and the optical member enters the light guide plate Glossy.
Hongfujin Precision Industry (Shenzhen) Co., Ltd.
Disclosed is a diffuser and a light emitting device, display device and electronic device using the diffuser (publication number: CN105485626A, publication date: 20160413) using a direct light source, each light source is equipped with an independent light expander, the material of the diffuser Contains epoxy resin, ammonium persulfate and quantum dots. In order to avoid the problem of reducing the luminous efficiency of quantum dots caused by the infiltration of oxygen and/or moisture, a layer of light-transmitting sealing material can be encapsulated on the light-expanding surface of the light-expanding element, such as high Molecular film or ultra-thin glass.
TCL Group Co., Ltd.
A CdSe/CdS nanorod, a polarizing film and a preparation method thereof are disclosed (publication number: CN106353847A, publication date: 20170125), a polarizing film based on CdSe/CdS nanorods, and excessive dipoles of CdSe/CdS nanorods are prepared Arranging along the long axis of the nanorods can make the light produce polarized emission, so that the quantum dot TV can effectively realize the light output without adding a polarizer to control the light output, thereby avoiding energy loss and simplifying the structure of the backlight assembly.
Southern University of Science and Technology
Disclosed is an active brightness enhancement film, its preparation method and a method for analyzing the polarization of the active brightness enhancement film based on FDTD (publication number: CN106773285A, publication date: 20170531). The polymer film stack combination of metal nanorods can obtain the fluorescence emitted by the quantum dots and the high-efficiency polarized light of the light source wavelength band with the greatest efficiency.
South Korea Samsung Display Co., Ltd.
Disclosed is a photosensitive resin composition and a display device including a color conversion layer made by the same (publication number: CN107102513A, publication date: 20170829). The photosensitive resin composition includes quantum dots, photopolymerizable compounds, photopolymerization initiators, Soluble reducing resins and solvents. In order to solve the problem of reducing light efficiency and/or color reproducibility due to heat generated in the patterning process.
Southeast University
A method for preparing a color filter with quantum dots coupled with plasma (publication number: CN105629362A, publication date: 20160601) is disclosed, using a metal quantum dot plasma coupler to replace the quantum dots in the existing quantum dot color filter. In order to reduce the amount of quantum dots used, reduce energy consumption and increase display brightness.
South Korea LG Electronics Co., Ltd.
Disclosed is a (publication number: CN106662775A, publication date: 20170510) backlight unit and a display device including the backlight unit, which use quantum dot phosphors to provide primary light excitation from a light source to emit a light having a wavelength different from that of the primary light The secondary light is arranged to be spaced apart from the light source and absorbs light with a specific wavelength from the primary light or the secondary light through the photo-cutting agent, thereby realizing a wide color gamut backlight unit by reducing the FWHM of the peak in the spectrum .
2. Overview of the development of quantum dot display technology
At present, quantum dot display technology can be divided into three different types according to the packaging method of quantum dot materials. The following is an overview of the technological development in this area based on patented technologies in recent years.
❂ Chip package type
In this structure, the quantum dot luminescent material replaces the traditional phosphor material and is encapsulated in the patch blue LED to obtain a series of patch white light LEDs. The advantage of this structure is that the amount of quantum dot luminescent material is small, which reduces cost.
Hongfujin Precision Industry (Shenzhen) Co., Ltd.
A diffuser (Publication No.: CN105485626A, Publication Date: 20160413) adopts a direct-lit light source, each light source is equipped with an independent light expander, and the diffuser material contains epoxy resin, ammonium persulfate and quantum dots, in order to avoid The penetration of oxygen and/or water vapor leads to the problem of reduced luminous efficiency of quantum dots. A layer of light-transmitting sealing material, such as polymer film or ultra-thin glass, can be encapsulated on the light-expanding surface of the light-expanding element.
Shenzhen TCL New Technology Co., Ltd.
(Publication number: CN107728376, publication date: 20180223) The quantum dot material is encapsulated in the lens above the light source, and the excitation efficiency of the quantum dot is improved by improving the shape of the lens. Shenzhen TCL New Technology Co., Ltd. also designed quantum dot particle layers of different colors arranged in layers in the up and down direction. The distance between each layer and the light-emitting chip is set from far to near, which improves the NTSC color gamut of the LED.
❂ Light guide plate side package type
Samsung Electronics Co., Ltd.
(Publication Number: CN102954408A, Publication Date: 20130306) The quantum dots are packaged in strips and arranged between the light guide plate and the light source to change the color of the light emitted from the light source.
U.S. QD Optics Co., Ltd.
A light mixing chamber (publication number: CN104169786A, publication date: 20141126) for use with a light guide plate is disclosed, including a housing, the housing has a channel formed in the housing, and the channel is exposed to the outside of the housing; , Formed in the housing; an opening formed in the housing and connecting the chamber to the channel; LED light source; optical member filled with quantum dots; light emitted from the LED passes through the opening and the optical member enters the light guide plate Glossy.
Skyworth Liquid Crystal Devices (Shenzhen) Co., Ltd.
(Publication number: CN105090834A, publication date 20151125) A groove is opened on the light incident surface adjacent to the light guide plate and the quantum dot material is encapsulated in the groove, which reduces the volume of the liquid crystal display device.
Qingdao Hisense Electric Co., Ltd.
(Publication No.: CN105259701A, Publication Date: 20160120) By improving the tube shape of the encapsulated quantum dot material, the problem of total reflection when the light emitted by the light emitting diode enters the quantum dot adhesive layer from the wall of the quantum tube is improved.
❂ Optical film integrated type
Fujifilm Corporation
(Publication No.: CN106457756A, Publication Date: 20140222), by including a thixotropic agent in the composition using the content sub-dots of the coating liquid to achieve high shear for uniformly obtaining the film thickness of the coating film (representative Value 500s-1) low viscosity, high viscosity at low shear (representative value 1s-1) used to uniformly bond the substrate, so as to obtain a uniform coating film content without coating streaks The layer of dots, and the coating film is sandwiched between the first substrate and the second substrate and laminated, and the coating film is cured to form a layer containing dots. small.
Fujifilm Corporation
(Publication number: CN106716188A, publication date: 20170524), also started from improving the optical properties of the base film of the quantum dot wavelength conversion layer, making the base film's absorption rate of light with a wavelength of 450nm measured using an integrating sphere less than 0.9%, In addition, the total light transmittance is less than 92%. According to this structure, a wavelength conversion member with less light loss can be provided.
Korea Corning Precision Materials Co., Ltd.
(Publication number: CN107077028A, publication date: 20170818), the quantum dot coating layer is set between the light-emitting surface of the light guide plate and one surface of the thin glass plate, and a sealant and moisture absorber are used between the thin glass plate and the light guide plate The quantum dot coating layer is isolated from external oxygen and moisture. In addition, the quantum dot coating layer is also provided with corresponding patterns so that the light can be converted into additional wavelengths, thereby improving the color conversion efficiency.
BOE Technology Group Co., Ltd.
A quantum dot enhancement film and its preparation method, backlight and display device (publication number: CN107634133A, publication date: 20180126) are disclosed, and a quantum dot enhancement film with a limit layer is provided, so that the quantum dot enhancement film does not The aggregation of quantum dot materials is prone to occur, and fluorescence quenching is not prone to occur.
Shenzhen TCL New Technology Co., Ltd.
(Publication number: CN107329201A, publication date: 20171107) The reflective film surface is coated with a quantum dot material and a wavelength conversion layer mixed with UV glue on the bottom surface of the light guide plate, which saves quantum dot material and manufacturing cost.
Fujifilm Corporation
(Publication number: CN107209298A, publication date: 20170926) The wavelength conversion layer contains quantum dots in the organic matter obtained by curing a curable composition containing an alicyclic epoxy compound, and uses silicon nitride or silicon oxynitride as The main component acts as a barrier layer that inhibits the photo-oxidation reaction of quantum dots to obtain higher brightness and durability.
