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A method for manufacturing a flexible color micro-LED display device

A display device and flexible technology, applied in the field of flexible color micro-LED display device preparation, can solve the problems of low color rendering index, narrow phosphor excitation band, low conversion efficiency, etc., achieve high pixel density, fast and effective manufacturing method, low cost effect

Active Publication Date: 2019-01-15
福州市福大微纳显示科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The three-color fluorescent conversion layer can be phosphor powder or quantum dots, but phosphor powder has a narrow excitation band, low color rendering index, and low conversion efficiency, while quantum dots have a wide and continuous distribution of excitation spectrum, narrow and symmetrical emission spectrum, and adjustable colors. , high photochemical stability, long fluorescence lifetime and other superior fluorescence characteristics, are widely used in GaN-based LED displays as color converters

Method used

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  • A method for manufacturing a flexible color micro-LED display device
  • A method for manufacturing a flexible color micro-LED display device

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preparation example Construction

[0030] The preparation method of the flexible color filter film comprises the following steps:

[0031] Step S01: Prepare quantum dot polymer solutions with different luminescent wavelengths respectively;

[0032] Step S02: preparing a liquid polymer resin as the main body of the flexible color filter film;

[0033] Step S03: Use inkjet printing to print quantum dot polymer solutions with different luminous wavelengths on the liquid polymer resin according to the corresponding micro-LED array arrangement, and use the liquid polymer resin to suppress the diffusion of the quantum dot polymer solution , to prepare a high-density quantum dot lattice;

[0034] Step S04: Control the standing time of the quantum dots on the liquid polymer resin, so that the quantum dots completely sink into the liquid polymer resin, by controlling the viscosity of the glue in the liquid polymer resin, the size of the inkjet printing nozzle, and the ink droplet The pressure and the number of ink dro...

specific Embodiment 1

[0082] Include the following steps:

[0083] (1) Take a clean flexible substrate, and determine the area and pattern of the electrode on the flexible substrate by photolithography and wet etching. The size of the electrode is 4500 μm × 20 μm;

[0084] (2) Apply an adhesive on the determined area to promote the bonding between the flexible substrate and the metal electrode, and then use an electron gun to coat 10g of metal copper into the established area with a thickness of about 25 μm;

[0085] (3) Prepare the sapphire substrate and perform patterning on its surface. The pattern is cone-shaped, the diameter of each pattern is 2.1 μm, the height is 1.3 μm, and the interval between patterns is 900 nm;

[0086] (4) A 2μm undoped GaN buffer layer, a 3μm silicon-doped n-GaN, and a 100nm InGaN / GaN active layer (MQW) with a center wavelength of 380nm were grown on sapphire by metal organic chemical vapor deposition (MOCVD) and 0.2 μm magnesium-doped p-GaN;

[0087] (5) Prepare a l...

specific Embodiment 2

[0095] Include the following steps:

[0096] (1) Take a flexible TFT panel or a flexible CMOS panel;

[0097] (2) Bonding the prepared micro-LED array to the above driving panel;

[0098] (3) Prepare PDMS glue, and apply it to the fabricated flexible micro-LED device by scraping;

[0099] (4) Preparation of quantum dot polymer solution;

[0100] (5) Use the inkjet printing method to hit the prepared quantum dot polymer solution on the surface of PDMS, let it stand for 5-15 minutes, and then heat it at 80°C for 3 hours to volatilize the organic solvent in the solution and cure the PDMS film layer.

[0101] Parts similar to those in Embodiment 1 will not be repeated here.

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Abstract

The invention relates to a flexible color micro LED display device manufacturing method that comprises a flexible substrate with a driving circuit arranged in order from bottom to top, LED array, flexible color filter film; The flexible color filter film is prepared by preparing quantum dot polymer solutions with different luminescent wavelengths, preparing liquid polymer resins as the main bodyof the flexible color filter film, respectively printing the quantum dot polymer solutions with different luminescent wavelengths by ink jet printing mode according to the corresponding Micro- A LED array is printed on that liquid polymer resin, and the liquid polymer resin is heated or ultraviolet cure to form a high-resolution flexible color filter film. The preparation method of the invention is fast and effective, simple in structure, simple in operation and low in cost, and can be used for preparing color micro with high pixel density and high resolution. LED display device, and providesa new idea for the manufacture of flexible optoelectronic devices.

Description

technical field [0001] The invention relates to the field of photoelectric display, in particular to a method for preparing a flexible color micro-LED display device. Background technique [0002] Micro-LED realizes the thinning, miniaturization and matrixing of LEDs by integrating high-density micro-sized LED arrays on a chip. The pixel distance is reduced from millimeters to microns, and the volume is 1 of the current mainstream LED size. %, each pixel can be addressed and illuminated individually, and has low power consumption (power consumption is only one tenth of LCD), high brightness, ultra-high resolution and color saturation, faster response speed, and longer life With the advantages of long length and higher efficiency, it can realize high-precision spatial positioning and tactile perception, and make more realistic AR and VR possible. It is one of the most promising next-generation display devices, but there are still many technical difficulties. Such as full col...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/56H01L51/54H01L51/50
CPCH10K71/135H10K85/40H10K50/115H10K50/13
Inventor 周雄图翁雅恋张永爱郭太良严群林金堂叶芸
Owner 福州市福大微纳显示科技有限公司
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