CN211858650U

CN211858650U - Quantum dot full-color Micro/Mini-LED display screen structure

Info

Publication number: CN211858650U
Application number: CN202020630276.9U
Authority: CN
Inventors: 赖耀升; 江建志
Original assignee: Aeneq Co ltd
Current assignee: Aeneq Co ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-11-03
Anticipated expiration: 2030-04-23

Abstract

The utility model discloses a full-color Micro Mini-LED display screen structure of quantum dot, including the drive base plate, drive base plate top is provided with the electrode layer, and the electrode layer top is provided with blue light source, blue light source upper surface has plated first SiO2 layer, and first SiO2 layer top is provided with quantum dot light look conversion film, and quantum dot light look conversion film upper surface has plated second SiO2 layer, and second SiO2 layer facing is with preventing dazzling the protection film, the utility model discloses a this full-color technique only need shift blue LED once, improves the yields of product by a wide margin, utilizes first SiO2 and second SiO2 layer to carry out effectual protection, increase of service life to quantum dot light look conversion film.

Description

Quantum dot full-color Micro/Mini-LED display screen structure

Technical Field

The utility model belongs to the LED display screen field, more specifically the utility model relates to a full-color Micro Mini-LED display screen structure of quantum dot that says so.

Background

The Micro-LED display technology is to miniaturize the traditional inorganic LED array, and each LED pixel point with the size of 10 microns can be independently addressed and lightened. Briefly, it can be seen that the size of the closely spaced LEDs is further reduced to the order of 10 microns. The Micro-LED display mode is very direct, and the LED chips with the size of 10 microns are connected to the TFT driving substrate, so that the light emitting brightness of each chip is accurately controlled, and image display is further realized.

The Display principle and the manufacturing method of the Micro-LED Display are characterized in that the LED structure is designed to be thinned, miniaturized and arrayed, and the size of the LED structure is only about 10 mu m grade; then transferring the Micro-LEDs to a circuit substrate in batch, wherein the substrate can be a hard and soft transparent or opaque substrate; and then, the physical deposition process is utilized to complete the protective layer and the upper electrode, so that the upper substrate can be packaged, and the Micro-LED display screen with a simple structure is completed.

To produce a display, the substrate surface must be fabricated into an array structure like an LED display, and each dot pixel must be addressable, controlled, and individually driven to light. If the CMOS circuit is driven by the CMOS circuit, the CMOS circuit is an active addressing driving framework, and the Micro-LED and the array substrate CMOS can be combined through a packaging technology. After the bonding, the Micro-LED can improve the brightness and the contrast by integrating the Micro-lens array. The Micro-LED array is connected with the positive electrode and the negative electrode of each Micro-LED through the vertically staggered positive grid electrode and the negative grid electrode, the Micro-LEDs are sequentially electrified through the electrode wires, and the Micro-LEDs are lightened through a scanning mode to display images.

The quantum dot material is used as a novel luminescent material applied to equipment such as illumination or display, can effectively improve the light color stability (accurate regulation and control of spectrum) and the color gamut of backlight products due to wide excitation spectrum, good monochromaticity, adjustable luminescence peak wavelength and high conversion efficiency, is used for making up or replacing the defects of rare earth doped fluorescent powder in energy level distribution and luminous efficiency, and has more economic advantages and application prospects.

Compared with the traditional organic fluorescent powder, the quantum dot has the advantages of adjustable light-emitting wavelength (capable of covering visible and near-infrared bands), high fluorescence quantum efficiency (capable of being more than 90%), small particle size, high color saturation, low-price solution processing, high stability and the like, and particularly, the color gamut of the quantum dot can exceed that of an HDTV standard color triangle due to the fact that the light-emitting with high color purity is remarkable. Therefore, the light emitting diode based on the quantum dots is expected to be applied to next-generation flat panel display and illumination.

The quantum dot LED or OLED display panel generally adopts a blue LED/OLED as a blue light source, a quantum dot light-color conversion film is attached to the blue LED/OLED, the most important thing in the manufacturing process is the manufacturing of the quantum dot light-color conversion film, for example, the application number is 201910596256.6, the name is a patterned quantum dot film preparation method and quantum dots, the quantum dot ink is manufactured into quantum dot ink by a quantum dot material, the quantum dot ink is deposited on a substrate in a specific pattern by adopting an ink-jet printing or gravure printing process, a protective film is coated after the quantum dot ink is cured on a transparent substrate, the quantum dot film is formed after the quantum dot ink is completely cured, the protective film adopts UV glue, namely transparent glue, and due to the poor water-oxygen stability of the quantum dot material, the service life of the conventional UV glue encapsulation is short, the failure is fast, and the common encapsulation mode can not realize the effective protection of the quantum dot material.

SUMMERY OF THE UTILITY MODEL

The utility model provides an it only needs to shift blue LED once to adopt this full-color technique, improves the yields of product by a wide margin, utilizes first SiO2 and second SiO2 layer to carry out effectual protection, increase of service life to quantum dot light look conversion film.

In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a full-color Micro of quantum dot Mini-LED display screen structure, includes the drive base plate, and drive base plate top is provided with the electrode layer, and the electrode layer top is provided with blue light source, first SiO2 layer has been plated to the blue light source upper surface, and first SiO2 layer top is provided with quantum dot light and color conversion membrane, and second SiO2 layer has been plated to quantum dot light and color conversion membrane upper surface, and second SiO2 layer facing has the protection film of dazzling prevention.

Further, the blue light source is a blue Micro-LED or a blue Mini-LED.

The quantum dot light-color conversion film further comprises red, green and transparent sub-pixels, the three color sub-pixels are in a regular array, and BM, Micro-LEDs or blue Mini-LEDs are arranged between the three color sub-pixels and correspond to the sub-pixels one by one.

The material of the red sub-pixel is red quantum dot ink, the material of the green sub-pixel is green quantum dot ink, and the material of the transparent sub-pixel is transparent ink.

The quantum dot light-color conversion film is formed by printing quantum dot ink and transparent ink on the first SiO2 layer.

Compared with the prior art, the beneficial effects of the utility model are that:

1. at present, the large-scale commercial production of the Micro-LED display screen still faces a layer of technical bottlenecks, including six aspects of epitaxy and chip, transfer, full colorization, power supply driving, detection and repair technology. In the past, the most bottleneck is generally considered to be a transfer technology, such as Pick & Place transfer, fluid assembly, laser transfer printing, Roll to Plate and the like, and the full-color technology is adopted to transfer single-color (blue) LEDs only once, so that the yield of products is greatly improved;

2. in the specifications that cannot be reached by LCD or OLED displays, Micro-LED technology can be complemented;

3. the first SiO2 layer and the second SiO2 layer are used for effectively protecting the quantum dot light-color conversion film, and the service life is prolonged;

4. when the driving substrate is foldable, the whole Micro-LED display screen can be integrally bent;

5. the utility model discloses the method can produce Micro-LED and Mini-LED display screen in the well.

Drawings

FIG. 1 is a schematic diagram of a mid-quantum dot full-color Micro/Mini-LED display screen structure according to the present invention;

FIG. 2 is a schematic structural diagram of a quantum dot light-color conversion film and a protective layer;

FIG. 3 is a flow chart of a method for manufacturing a quantum dot full-color Micro/Mini-LED display screen structure;

fig. 4 is a schematic structural view of the gravure pad printing apparatus used in the present invention.

Reference numerals: 1. a drive substrate; 2. an electrode layer; 3. a blue light source; 4. a quantum dot light-color conversion film; 41. a red sub-pixel; 42. a green sub-pixel; 43. a transparent sub-pixel; 5. an anti-glare protective film; 61. a first SiO2 layer; 62. a second SiO2 layer; 7. BM; 81. an ink roller; 82. a gravure cylinder; 83. a pad printing roller; 84. cleaning the roller; 85. a scraper; 86. an ink bin; 87. a jig; 88. and (5) a workpiece.

Detailed Description

In the description of the present invention, it should be noted that, for the orientation words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and the positional relationship are indicated based on the orientation or the positional relationship shown in the drawings, and the description is only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the device or the element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and "a plurality" or "a plurality" in the description of the invention means two or more unless a specific definition is explicitly provided.

The utility model provides a full-color Micro of quantum dot Mini-LED display screen structure, includes drive base plate 1, and drive base plate 1 top is provided with electrode layer 2, and electrode layer 2 top is provided with blue light source 3, first SiO2 layer 61 has been plated to blue light source 3 upper surface, and first SiO2 layer 61 top is provided with quantum dot light and color conversion membrane 4, and second SiO2 layer 62 has been plated to quantum dot light and color conversion membrane 4 upper surface, and second SiO2 layer 62 facing has prevents dazzling protection film 5.

In the embodiment, the blue light source 3 is a blue Micro-LED or Mini-LED, and in the embodiment, the Micro-LED is taken as an example.

The quantum dot light and color conversion film 4 comprises red, green and transparent sub-pixels 43, the three color sub-pixels are in a regular array, BM7 (opaque ink areas) are arranged between the three color sub-pixels, Micro-LEDs or blue Mini-LEDs are in one-to-one correspondence with the sub-pixels, as shown in fig. 1 and 2, the red, green and transparent sub-pixels 43 are sequentially and circularly arranged to form a regular array, and one Micro-LED or blue Mini-LED corresponds to the lower part of each corresponding sub-pixel.

The material of the red sub-pixel 41 is red quantum dot ink, the material of the green sub-pixel 42 is green quantum dot ink, and the material of the transparent sub-pixel 43 is transparent ink.

The quantum dot light-color conversion film 4 is formed by printing quantum dot ink and transparent ink on the first SiO2 layer 61.

The first SiO2 layer 61 and the second SiO2 layer 62 in this embodiment are both below 10 microns thick.

Wherein the quantum dot ink is described in application No. 201610272494.8; 201610272908.7, respectively; 201710433461.1, respectively; 201510450278.3 patent, and a preparation method thereof.

A manufacturing method of a quantum dot full-color Micro/Mini-LED display screen structure comprises the following steps:

1) manufacturing an electrode layer 2 on a driving substrate 1, and manufacturing a blue Micro-LED layer on the electrode layer 2 in a batch transfer mode, wherein the blue Micro-LED layer is of a layer structure formed by a plurality of LED arrays;

2) plating a first SiO2 layer 61 on the upper surface of the blue Micro-LED layer by adopting a PVD or CVD vacuum coating method;

3) printing BM ink patterns in a pixel region above a first SiO2 layer 61 by adopting gravure pad printing equipment, thermally curing or UV curing, and curing the BM ink patterns, wherein the BM ink patterns divide different color target regions above the first SiO2 layer 61, and the different color target regions specifically comprise a red quantum dot light-emitting point target region, a green quantum dot light-emitting point target region and a transparent ink target region, namely each target region is formed by circling the BM7 ink patterns after curing;

in the embodiment, the distribution area of the blue Micro-LEDs in the blue Micro-LED layer is the same as the target area, and the sub-pixels correspond to the Micro-LEDs one by one, namely, one Micro-LED is arranged below one sub-pixel;

4) printing quantum dot ink or transparent ink with corresponding colors in the target areas with corresponding colors by adopting gravure pad printing equipment, carrying out thermal curing or UV curing, and curing the quantum dot ink and the transparent ink to form a quantum dot light-color conversion film 4;

specifically, 4.1) red quantum dot ink is printed in a red quantum dot light spot target area by adopting intaglio transfer printing equipment, a red quantum dot pattern template is manufactured according to the position of the red quantum dot light spot target area to form an intaglio roller 82, and the red quantum dot ink can be accurately printed in the red quantum dot light spot target area according to a preset red quantum dot pattern template; thermally curing or UV curing, and curing the red quantum dot ink;

4.2) printing green quantum dot printing ink in the green quantum dot light spot target area by adopting intaglio transfer printing equipment, manufacturing a green quantum dot pattern template according to the position of the green quantum dot light spot target area to form an intaglio roller 82, and accurately printing the green quantum dot printing ink in the green quantum dot light spot target area according to a preset green quantum dot pattern template; thermally curing or UV curing, and curing the green quantum dot ink;

4.3) printing transparent ink in a transparent ink target area by adopting a pad printing device, manufacturing a transparent ink pattern template according to the position of the transparent ink target area to form an intaglio cylinder 82, and accurately printing the transparent ink in the transparent ink target area according to a preset transparent ink pattern template; thermal curing or UV curing, curing the transparent ink;

the sequence of the steps 4.1), 4.2) and 4.3) can be changed randomly, and the gravure cylinders 82 in the three steps are mutually independent gravure cylinders 82;

blue Micro-LEDs are arranged below target areas corresponding to the red quantum dot ink, the green quantum dot ink and the transparent ink in the vertical direction, and are in one-to-one correspondence;

5) plating a second SiO2 layer 62 as a protective and insulating layer on the surface of the quantum dot light color conversion film 4 by adopting a PVD or CVD vacuum coating method;

6) an antiglare protective film 5 is attached to the surface of the second SiO2 layer 62.

When the blue light source 3 is a blue Mini-LED, the above-mentioned method may be employed for the manufacturing method.

The intaglio pad printing device adopted in the embodiment is shown in fig. 4, and includes a frame, an ink roller 81, an intaglio roller 82, a pad printing roller 83 and a cleaning roller 84 which are sequentially contacted are arranged in the frame, a scraper 85 is arranged on the side surface of the intaglio roller 82, a part of the ink roller 8181 is immersed in an ink bin 86, a movable jig 87 is arranged below the pad printing roller 83, a workpiece 88 to be printed (an unfinished quantum dot full-color Micro/Mini-LED display screen) is arranged on the jig 87, and the specific structure of the intaglio pad printing device can refer to patent No. 201920381009. X; 201920705690.9 and 201920705687.7.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a full-color Micro of quantum dot Mini-LED display screen structure, includes the drive base plate, and drive base plate top is provided with the electrode layer, and the electrode layer top is provided with blue light source, its characterized in that: the blue light source upper surface has plated first SiO2 layer, and first SiO2 layer top is provided with quantum dot light and color conversion membrane, and quantum dot light and color conversion membrane upper surface has plated second SiO2 layer, and the upper laminating of second SiO2 layer is with preventing dazzling the protection film.

2. The full-color Micro/Mini-LED display screen structure of quantum dot of claim 1, characterized in that: the blue light source is a blue Micro-LED or a blue Mini-LED.

3. The full-color Micro/Mini-LED display screen structure of quantum dot of claim 2, characterized in that: the quantum dot light-color conversion film comprises red, green and transparent sub-pixels, the three color sub-pixels are in a regular array, and BM, Micro-LEDs or blue Mini-LEDs are arranged between the three color sub-pixels and correspond to the sub-pixels one by one.

4. The full-color Micro/Mini-LED display screen structure of quantum dot of claim 3, characterized in that: the red sub-pixel is made of red quantum dot ink, the green sub-pixel is made of green quantum dot ink, and the transparent sub-pixel is made of transparent ink.

5. The full-color Micro/Mini-LED display screen structure of quantum dot of claim 4, characterized in that: the quantum dot light-color conversion film is formed by printing quantum dot ink and transparent ink on the first SiO2 layer.