Novel display process based on electro-optical integrated display technology

Abstract

The invention discloses a novel display process based on an electro-optic integrated display (EPID) technology. The novel display process comprises a design process, a structure process and a preparation process of the EPID, and is characterized in that the novel display process comprises the design process, the structure process and the preparation process of the EPID; the design of the EPID comprises a concept of forming light-emitting three primary colors, the structure comprises a display panel, a light-emitting color film, an OCA, an OLED, a protective film and a rear cover, the light-emitting color film comprises a red photoluminescence pixel matrix, a green photoluminescence pixel matrix, a black matrix and a blank pixel matrix which are excited by electroluminescent blue pixels, and the light-emitting color film is attached to the OCA. Compared with the prior art, the invention has the advantages that: due to multiple selectable schemes of the excitation source, the display with more optimized performance can be flexibly manufactured according to the requirements of application scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of display design processes, and specifically to a new display process based on electro-optical integrated display technology. Background Art

[0002] South Korea has withdrawn from the manufacturing of liquid crystal displays and concentrated on developing OLEDs, aiming to achieve the full replacement of liquid crystal displays by OLEDs. It is building a high-quality 8.6-generation OLED production line and expects to achieve mass production in 2026.

[0003] China has invested more than one trillion yuan in the TFT-LCD industry and more than 700 billion yuan in the OLED industry. It has 80% of the global panel production capacity and is the world's largest manufacturing center, R & D center, and consumption center. It has formed leading enterprises in the display panel industry represented by BOE, TCL CSOT, Tianma Microelectronics, Visionox, Shanghai Hehui Optoelectronics, and HKC Optoelectronics. With the support of national policies, a preliminary industrial chain has been formed.

[0004] Current Main Problems

[0005] The liquid crystal industry has a large scale, low efficiency, and high energy consumption. The utilization rate of light sources is only 3-7%. More than 90% of the light energy is wasted, and it also causes serious social visual health hazards.

[0006] The OLED process is too complex, the performance discreteness of the three primary color materials is too large, and the three primary color electroluminescent organic materials rely on imports, resulting in too high production costs. Currently, it is mainly applied to small-size display fields such as mobile phones. The entire OLED industry is at greater risk.

[0007] In addition, existing inorganic semiconductor displays (Mini-led and Micro-led) epitaxially grow red, blue, and green three primary color pixels on sapphire or silicon-based substrates using atomic beam technology, with high costs. Each type of substrate can only grow one primary color, and the red, blue, and green three primary colors need to be grown on different substrates. The largest substrate is only 8 inches. The light-emitting chips of the three primary colors are peeled off from three different substrates and placed on the display substrate with a driving circuit according to the requirements of the three primary colors of the display. The number of pixels to be transferred is extremely large, and such a large amount of transfer is very difficult. The discreteness of the pixel performance consistency grown on different substrates is large, and the correction of the three primary color chromaticity differences is complex, making it difficult to manufacture on a large scale. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the above technical defects, and provide a technology that can solve the problems of high power consumption of TFT-LCD displays, low brightness, short lifespan, complex process, low qualification rate, and high cost of OLEDs, solve the problem that the OLED product line is limited to the small-size field, solve the process problem of massive transfer of inorganic semiconductor displays, and realize the large-scale mass production of inorganic semiconductor displays.

[0009] To solve the above problems, the technical solution of the present invention is: a new display process based on electro-optical integrated display technology, including the structure and manufacturing process of EPID;

[0010] The EPID design includes the design concept of the formation of the three primary colors of EPID and the structure of the three primary colors. The key point is to propose a brand-new concept for the formation of the three primary colors of a light-emitting display. The method of forming the three primary colors independently in the traditional way is cancelled, and a route of combining blue electroluminescence and photoluminescence to form the three primary colors is adopted. Blue electroluminescence (including OLE and inorganic semiconductor blue electroluminescence) is both the blue primary color of the three primary colors of the display and the excitation source of the red and green primary colors.

[0011] The structure of the EPID includes a TFT-driven blue electroluminescent pixel substrate, a photoluminescent color film composed of red and green photoluminescent pixels, colorless transparent pixels and a black matrix, a transparent optical adhesive, a protective film, and a back cover. The blue electroluminescent pixel substrate is composed of blue OLED light-emitting pixels and inorganic semiconductor blue electroluminescent pixels. The photoluminescent color film is composed of red and green light-emitting pixels, non-light-emitting transparent pixels and a black matrix. The photoluminescent color film is attached to the blue electroluminescent pixel substrate through OCA.

[0012] Furthermore, the blue electroluminescent pixel substrate is a TFT-driven organic electroluminescent (OLED) substrate or an inorganic semiconductor light-emitting substrate driven by a semiconductor integrated circuit.

[0013] The blue OLED electroluminescent pixels are fabricated by a maskless evaporation process, and the inorganic semiconductor blue electroluminescent pixels are fabricated by a semiconductor epitaxial growth process.

[0014] Furthermore, the blue organic electroluminescent (OLED) substrate is formed by evaporating blue OLED materials on a glass or flexible plastic substrate with a TFT driving circuit. The inorganic semiconductor light-emitting substrate driven by a semiconductor integrated circuit (including TFT) is formed by peeling off the blue light-emitting chips grown on a wafer and transferring them to a glass or flexible plastic substrate with a driving circuit.

[0015] Furthermore, the red, green, colorless transparent pixels and the black matrix can be fabricated by one of the methods of coating lithography, screen printing, inkjet printing or evaporation.

[0016] Further, the light-emitting color film can be manufactured by methods such as inorganic phosphor paste coating lithography, screen printing, inorganic phosphor inkjet printing, or inorganic phosphor evaporation coating.

[0017] Further, the light-emitting color film can be manufactured by methods such as quantum dot phosphor paste coating lithography, screen printing, quantum dot phosphor inkjet printing, or quantum dot phosphor evaporation coating.

[0018] Further, the substrate for manufacturing the light-emitting color film is glass or plastic film

[0019] A new display process based on electro-optical integrated display technology, the manufacturing process of the phosphor coating lithography is as follows:

[0020] Step 1: Substrate cleaning;

[0021] Step 2: Black matrix (BM) manufacturing;

[0022] Step 3: Red matrix manufacturing;

[0023] Step 4: Green matrix manufacturing;

[0024] Step 5: Blank matrix manufacturing.

[0025] A new display process based on electro-optical integrated display technology, the manufacturing process of the phosphor screen printing is as follows:

[0026] Step 1: Print the black matrix, specifically, use a roller or a squeegee or a spray gun to print the prepared black matrix paste on a patterned screen with protected red pixel, green pixel, and blank pixel patterns, and then transfer it to the glass or film with the black matrix and red pixels;

[0027] Step 2: Curing, use a curing device to cure the black matrix pattern in Step 1;

[0028] Step 3: Print the red pixel matrix, specifically, use a roller or a squeegee or a spray gun to print the prepared red phosphor paste on a patterned screen with protected black matrix, green pixel, and blank pixel patterns, and then transfer it to the glass or film with the black matrix and red pixels;

[0029] Step 4: Curing, use a curing device to cure the red matrix pattern in Step 3;

[0030] Step 5: Print the green pixel matrix, specifically, use a roller or a squeegee or a spray gun to print the prepared green phosphor paste on a patterned screen with protected black matrix, red pixel, and blank pixel patterns, and then transfer it to the glass or film with the black matrix and red pixels;

[0031] Step 6: Curing. Use a curing device to cure the green matrix pattern in Step 5.

[0032] The advantages of the present invention compared with the existing technologies are as follows:

[0033] For a conventional OLED display panel, the fabrication of a one-time OLED blue pixel substrate not only omits the cost of the metal mask but also breaks through the limitation on the size of the fabricated display panel caused by the mask, reduces the process and equipment requirements for fabricating OLED red and green pixels, saves a large amount of fabrication costs, improves the production tempo, and realizes the fabrication of large-scale and full-size series products of OLED semiconductor flat displays.

[0034] The product qualification rate is improved. Due to the complex processes for fabricating the three primary colors of semiconductor flat displays (including OLEDs and inorganic semiconductors), the product qualification rate cannot meet the requirements of large-scale production, resulting in a large amount of waste. EPID divides the three primary color pixels into two different fabrication processes. The blue pixels adopt a semiconductor fabrication process, while the red and green pixels adopt a fabrication method with lower equipment costs. Description of the Drawings

[0035] Figure 1 is a structural diagram of a phosphor-emitting color film of a novel display device process based on electro-optic integrated display technology of the present invention.

[0036] Figure 2 is the structure of a novel display device based on the EPID process of the present invention; Detailed Embodiments

[0037] The following further describes the detailed embodiments of the present invention with reference to the accompanying drawings. The same components are denoted by the same reference numerals.

[0038] It should be noted that the terms "front", "rear", "left", "right", "upper", and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0039] In order to make the content of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0040] Such as Figure 1 and Figure 2As shown in the figure, a new display process based on electro-optic integrated display technology includes an EPID structure and a manufacturing process; the EPID structure includes a TFT-driven blue electroluminescent pixel substrate, a photoluminescent color film composed of red and green photoluminescent pixels, colorless transparent pixels, and a black matrix, a transparent optical adhesive, a protective film, and a back cover. The blue electroluminescent pixel substrate is composed of blue OLED light-emitting pixels and inorganic semiconductor blue electroluminescent pixels. The photoluminescent color film is composed of red and green light-emitting pixels, non-light-emitting transparent pixels, and a black matrix. The photoluminescent color film is attached to the blue electroluminescent pixel substrate through OCA.

[0041] The blue electroluminescent pixel substrate is a TFT-driven organic electroluminescent (OLED) substrate and an inorganic semiconductor light-emitting substrate driven by a semiconductor integrated circuit. The blue OLED electroluminescent pixels are fabricated using an evaporation process, and the inorganic semiconductor blue electroluminescent pixels are fabricated using a semiconductor epitaxial growth process.

[0042] The blue organic electroluminescent (OLED) substrate is formed by evaporating blue OLED materials on a glass or flexible plastic substrate with a TFT driving circuit. The inorganic semiconductor light-emitting substrate driven by a semiconductor integrated circuit (including TFT) is formed by peeling off the blue light-emitting chips grown on a wafer and transferring them to a glass or flexible plastic substrate with a driving circuit.

[0043] A new display process based on electro-optic integrated display technology, the manufacturing process of the fluorescent powder screen printing is as follows:

[0044] Step 1: Print the black matrix. Specifically, use a roller or a squeegee or a spray gun to print the prepared black matrix slurry on a patterned screen with patterns protecting the red pixels, green pixels, and blank pixels, and then transfer it to a glass or film with a black matrix and red pixels.

[0045] Step 2: Cure. Use a curing device to cure the black matrix pattern in Step 1.

[0046] Step 3: Print the red pixel matrix. Specifically, use a roller or a squeegee or a spray gun to print the prepared red fluorescent powder slurry on a patterned screen with patterns protecting the black matrix, green pixels, and blank pixels, and then transfer it to a glass or film with a black matrix and red pixels.

[0047] Step 4: Cure. Use a curing device to cure the red matrix pattern in Step 3.

[0048] Step 5: Print the green pixel matrix. Specifically, use a roller, a squeegee, or a spray gun to print the prepared green phosphor slurry onto a patterned silk screen with a protective black matrix, red pixels, and blank pixel patterns, and then transfer it to a glass or film with a black matrix and red pixels.

[0049] Step 6: Cure. Use a curing device to cure the green matrix pattern in Step 5.

[0050] In specific use, the manufacturing process of the three primary color pixels is simplified. The manufacturing process of the three primary color displays of OLED semiconductor displays is extremely complex. OLED requires multiple evaporation depositions using a mask plate, while EPID does not require a mask plate. On the TFT substrate, a simple one-time or 2-3 times stacked evaporation deposition of blue pixels is used to form an OLED electroluminescent substrate that is both a blue light-emitting pixel and an excitation source for red and green light-emitting pixels. By attaching a color-emitting film with red, green, and blank pixels, the production of the three primary color OLED display panel is achieved. For inorganic semiconductor three primary colors, a huge amount of transfer is required to achieve. Using the EPID technology, only the single blue light-emitting chip grown on the wafer is peeled off as a whole and transferred to a glass substrate or a plastic substrate with a driving circuit. By attaching a color-emitting film with red, green, blank pixels, the production of the three primary color inorganic semiconductor display panel is achieved.

[0051] The traditional independent formation of the three primary colors is cancelled, and a route of combining blue electroluminescence and photoluminescence to form the three primary colors is adopted. Blue electroluminescence (including OLE and inorganic semiconductor blue electroluminescence) is both the blue primary color of the three primary colors of the display and the excitation source for the red and green primary colors.

[0052] EPID greatly reduces the manufacturing cost. The production of the OLED blue pixel disposable substrate not only omits the cost of the metal mask plate but also breaks through the limitation of the display panel size caused by the mask plate, reduces the process and equipment requirements for the production of two semiconductor pixels, not only saves a large amount of production costs but also improves the production rhythm, realizing the large-scale production of semiconductor flat panel displays.

[0053] The product qualification rate is improved. Due to the complex process of manufacturing the three primary colors of semiconductor flat panel displays, the product qualification rate cannot meet the needs of large-scale production, resulting in a large amount of waste.

[0054] For inorganic semiconductor three primary colors, a huge amount of transfer is required to achieve. Using the EPID technology, only the single blue light-emitting chip grown on the wafer is peeled off as a whole and transferred to a glass substrate or a plastic substrate with a driving circuit. By attaching a color-emitting film with red, green, blank pixels, and a black matrix, the production of the three primary color inorganic semiconductor display panel is achieved.

[0055] The EPID divides the three primary color pixels into two different manufacturing processes. The blue pixels adopt the semiconductor manufacturing process, while the red and green pixels adopt a manufacturing method with lower equipment costs. Different methods such as coating lithography, screen printing, inkjet printing, and evaporation can be adopted according to the requirements of the display application scenario. This greatly reduces the equipment capital investment for semiconductor pixel manufacturing, and effectively improves the product qualification rate due to the simplification of the process.

[0056] Compared with the manufacturing of three-primary-color semiconductor pixels, the product quality has been improved. The discreteness of the performance of the three-primary-color pixels is caused. The combination of simple one-time evaporation of blue pixels and photoluminescent color film improves the consistency of product performance, thereby improving the product quality.

[0057] The energy consumption of the display is greatly reduced. The light energy utilization rate of liquid crystal displays is only about 7%, and 90% of the light energy is wasted. The light energy utilization rate of EPID is almost 100%.

[0058] The above describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the gist of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. A novel display process based on electro-optical integrated display technology, characterized in that: It includes an EPID structure and a manufacturing process; A brand-new concept for forming the three primary colors of a light-emitting display is proposed. The method of forming the three primary colors independently in the traditional way is cancelled, and a route of forming the three primary colors by combining blue electroluminescence and photoluminescence is adopted. Blue electroluminescence (including OLE and inorganic semiconductor blue electroluminescence) is both the blue primary color of the three primary colors of the display and the excitation source for the red and green primary colors; The EPID structure includes a TFT-driven blue electroluminescent pixel substrate, a photoluminescent color film composed of red and green photoluminescent pixels, colorless transparent pixels and a black matrix, a transparent optical adhesive, a protective film and a back cover. The blue electroluminescent pixel substrate is composed of blue OLED light-emitting pixels and inorganic semiconductor blue electroluminescent pixels. The photoluminescent color film is composed of red and green light-emitting pixels, non-light-emitting transparent pixels and a black matrix. The photoluminescent color film is attached to the blue electroluminescent pixel substrate through OCA.

2. The novel display process based on electro-optical integrated display technology according to claim 1, characterized in that: The blue electroluminescent pixel substrate is a TFT-driven organic electroluminescent (OLED) substrate and an inorganic semiconductor light-emitting substrate driven by a semiconductor integrated circuit. The blue OLED electroluminescent pixels are fabricated by evaporation process, and the inorganic semiconductor blue electroluminescent pixels are fabricated by semiconductor epitaxial growth process.

3. A novel display process based on electro-optical integrated display technology according to claim 1, characterized in that: The blue organic electroluminescent (OLED) substrate is formed by evaporating blue OLED materials on a glass or flexible plastic substrate with a TFT driving circuit. The inorganic semiconductor light-emitting substrate driven by a semiconductor integrated circuit (including TFT) is formed by peeling off the blue light-emitting chips grown on a wafer and transferring them to a glass or flexible plastic substrate with a driving circuit.

4. A novel display process based on electro-optical integrated display technology according to claim 1, characterized in that: The red, green, colorless transparent pixels and the black matrix can be fabricated by one of the methods of coating lithography, screen printing, inkjet printing or evaporation.

5. A novel display process based on electro-optical integrated display technology according to claim 1, characterized in that: The photoluminescent color film can be fabricated by the method of coating lithography with inorganic phosphor slurry, screen printing, inkjet printing with inorganic phosphor ink or evaporation of inorganic phosphor.

6. A novel display process based on electro-optical integrated display technology according to claim 1, characterized in that: The photoluminescent color film can be fabricated by the method of coating lithography with quantum dot phosphor slurry, screen printing, inkjet printing with quantum dot phosphor ink or evaporation of quantum dot phosphor.

7. A novel display process based on electro-optical integrated display technology according to claim 4, characterized in that: The substrate for manufacturing the photoluminescent color film is glass or plastic film 8. A novel display process based on electro-optical integrated display technology according to claim 1, characterized in that: The manufacturing process of the phosphor coating lithography is as follows: Step 1: Substrate cleaning; Step 2: Black matrix (BM) fabrication; Step 3: Red matrix fabrication; Step 4: Green matrix fabrication; Step 5: Blank matrix fabrication.

9. A novel display process based on electro-optical integrated display technology according to claim 8, characterized in that: The manufacturing process of the phosphor screen printing is as follows: Step 1: Print the black matrix. Specifically, the prepared black matrix slurry is printed on a patterned screen with patterns protecting the red pixels, green pixels and blank pixels by a roller or a squeegee or a spray gun and then transferred to the glass or film; Step 2: Curing. The black matrix pattern in Step 1 is cured by a curing device; Step 3: Print the red pixel matrix. Specifically, the prepared red phosphor slurry is printed on a patterned screen with patterns protecting the black matrix, green pixels and blank pixels by a roller or a squeegee or a spray gun and then transferred to the glass or film with the black matrix; Step 4: Curing. Use a curing device to cure the red matrix pattern in Step 3. Step 5: Printing the green pixel matrix. Specifically, use a roller or a squeegee or a spray gun to print the prepared green phosphor paste onto a patterned silk screen with a protective black matrix, red pixels, and blank pixel patterns, and then transfer it to a glass or film with a black matrix and red pixels. Step 6: Curing. Use a curing device to cure the green matrix pattern in Step 5.

Images