Flexible low-power-consumption AMOLED display panel based on COE technology

Abstract

The invention discloses a flexible AMOLED display panel based on a COE technology and a preparation method of the flexible AMOLED display panel. Carrying out cutting, annealing treatment and plasma cleaning on the flexible polyimide substrate; photoresist is spin-coated on the substrate, and exposure, development and etching are carried out to form a drive circuit pattern; depositing an indium tin oxide layer and a protective layer through a CVD process; sequentially evaporating red light, green light and blue light emitting materials to form multiple OLED light emitting layers, and adding a hole transport layer and an electron blocking layer between every two layers; inorganic packaging layers are deposited through an atomic layer deposition technology, organic packaging layers are alternately deposited, and a multi-layer packaging structure is constructed; depositing a color film layer and a black matrix on the outer surface of the packaging layer; and finally, coating an optical transparent adhesive and attaching a transparent protective film. According to the flexible AMOLED display panel, by introducing the COE technology and optimizing the packaging structure, the effects of reducing the thickness of the panel, improving the light transmittance, reducing the power consumption and enhancing the display performance are achieved, and the reliability and applicability of the flexible AMOLED display panel are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of display devices, specifically an optimized design and manufacturing method for flexible AMOLED displays based on COE (Color On Encapsulation) technology. This technology aims to improve display performance, reduce power consumption, and enhance the screen's bending properties through innovative structures and processes. This technology is widely used in high-end display devices such as foldable phones, wearable devices, and automotive displays, offering high image quality, low power consumption, and high reliability. Background Art

[0002] With the rapid development of new display technologies, the use of AMOLED displays in smart terminals is becoming increasingly widespread. Flexible AMOLED displays are widely used in smart terminals and wearable devices due to their advantages, such as thinness, high contrast, and wide color gamut. However, while the polarizers (POLs) used in traditional displays effectively reduce reflectivity and improve contrast, their high thickness (typically 66μm) and low transmittance increase the overall thickness of the screen and increase power consumption. This invention aims to address the performance bottlenecks of existing display technologies by combining innovative flexible AMOLED technology with advanced manufacturing processes. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of existing flexible display panels in that it is difficult to strike a balance between high image quality and low power consumption, as well as the defects of thick stacking and insufficient bending fatigue life under traditional polarizer solutions, and to provide a flexible AMOLED display panel based on COE technology.

[0004] To achieve the above object, the present invention provides a method for manufacturing a flexible AMOLED display screen based on COE (Color On Encapsulation) technology, the manufacturing method comprising the following steps: Preparation of flexible polyimide material flexible substrate; forming a driving circuit layer on the substrate using photolithography and chemical vapor deposition (CVD) processes; Depositing the OLED light-emitting layer; A color filter layer is directly deposited on the outer surface of the encapsulation layer, including RGB sub-pixels and a black matrix between the color filters; A layer of optically clear adhesive is applied to the outside and a transparent protective film is added to improve the overall scratch resistance and environmental stability.

[0005] Preferably, after the flexible polyimide material flexible substrate is prepared, quality characteristics are tested to ensure that it has good flexibility and thermal stability.

[0006] Preferably, forming a driving circuit layer on a flexible substrate includes the following steps: The photolithography process forms a predetermined circuit pattern on the surface of the flexible substrate; Chemical vapor deposition (CVD) deposition of metals; Additional layer of protection.

[0007] The present invention also provides a manufacturing device for a flexible AMOLED display screen, the manufacturing device comprising: Annealing unit: used to anneal the flexible substrate to eliminate internal stress; Cleaning unit: uses plasma cleaning technology to remove impurities and oxides on the surface of flexible substrates; Evaporation unit: used to sequentially deposit red, green, and blue light-emitting materials and charge transport layers; Encapsulation unit: used for alternating deposition of organic / inorganic layers to form multi-layer encapsulation; Color filter unit: used for photolithography and spraying technology to form color filter layer and black matrix; Protective film unit: coated with transparent adhesive and attached with transparent protective film.

[0008] Preferably, the annealing unit of the device has a temperature control function and can accurately adjust the annealing temperature; the evaporation unit supports multi-target evaporation to improve deposition efficiency.

[0009] The present invention applies COE technology to flexible AMOLED display panels, bringing the following beneficial effects: Through the application of COE technology, the overall thickness of the panel is reduced by approximately 10%–20%, making it more adaptable to flexible devices, especially when used in foldable or rollable devices, demonstrating greater portability and design flexibility. By eliminating the traditional polarizer and optimizing the transmittance of the color filter layer, the overall power consumption of the device is reduced by approximately 15%–25%. This is of significant significance for extending the battery life of mobile devices, especially in high-brightness mode, where the power consumption advantage is even more pronounced. The optimized design of the color filter layer significantly increases the display brightness (by approximately 10%), while also enhancing contrast and making the picture clearer and more transparent. In addition, by optimizing the design of the color filter layer and black matrix, color uniformity at different viewing angles is improved, providing users with a more realistic visual experience. The application of a multi-layer organic / inorganic encapsulation structure and the addition of a high-toughness protective film increase the panel's flex life by approximately 30%. After bending tests, the display screen can still maintain a brightness of more than 95% after folding 30,000 times, and there is no peeling or cracking, ensuring long-term stability; the protective film has excellent scratch resistance and weather resistance, and the display performance remains stable under extreme temperature and humidity conditions. The high transmittance and low reflection design of the color film layer can still show good readability in strong light environments; through the production equipment of the present invention, using modular design and precision control technology, production efficiency is improved by about 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the cross-sectional structure of a flexible low-power AMOLED display panel based on COE technology of the present invention; Figure 2 This is a process flow chart for preparing a flexible low-power AMOLED display panel based on COE technology according to the present invention; Figure 3 This is a reflectivity comparison curve of Comparative Example 1 and Example 2 of the flexible low-power AMOLED display panel based on COE technology of the present invention; Figure 4 This is an experimental curve chart comparing the power consumption of Comparative Example 1 and Example 2 at the same brightness of the flexible low-power AMOLED display panel based on COE technology of the present invention; Figure 5 This is a brightness retention curve of a panel bending test of a flexible low-power AMOLED display panel based on COE technology of the present invention; Figure 6 This is a schematic diagram of the equipment module for manufacturing a flexible low-power AMOLED display panel based on COE technology of the present invention.

[0011] Description of reference numerals: 1-protective film, 2-color filter layer, 3-black matrix, 4-encapsulation layer, 5-pixel definition layer, 6-luminescent layer, 7-backplane drive circuit layer. DETAILED DESCRIPTION

[0012] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0013] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0014] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0015] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0016] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also mean internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0018] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] A flexible AMOLED display panel based on COE technology includes a flexible substrate, a driving circuit layer, an OLED light-emitting layer, and a translucent encapsulation layer (TFE) stacked in sequence. A color filter layer (Color Filter Layer) is directly formed on the outer surface of the translucent encapsulation layer to replace the traditional polarizer (POL). This achieves panel flexibility and reduces power consumption while maintaining or improving display quality.

[0020] The flexible substrate is made of polyimide (PI), polyethylene terephthalate (PET) or other polymer materials with flexible properties, which can maintain stable mechanical properties during bending or folding and support the deposition or coating of subsequent process layers.

[0021] The color filter layer includes color materials corresponding to the red, green, and blue sub-pixel areas, and a black matrix (BM) arranged at the gaps between the sub-pixels; wherein the black matrix is used to reduce the ambient light reflectivity of the panel, thereby improving the display contrast and color saturation.

[0022] The encapsulation layer (TFE) is a multilayer structure formed by alternating organic barrier films and inorganic barrier films to prevent water vapor and oxygen from penetrating into the OLED light-emitting layer; the color filter layer is directly deposited or coated on the surface of the encapsulation layer to eliminate the traditional polarizer and reduce the overall module thickness.

[0023] An optically transparent adhesive layer (OCA) is also provided between the encapsulation layer and the color filter layer, and its refractive index matches or approximately matches that of the color filter layer to reduce interface reflection between the multilayer structure and ensure display brightness; the optically transparent adhesive layer is elastic to adapt to bending deformation of the panel.

[0024] The color material transmittance of the color film layer is not less than 70% in the visible light band and has good optical stability, so that the operating current required to drive the OLED light-emitting layer under the same brightness conditions is reduced, thereby effectively saving power consumption.

[0025] The driving circuit layer formed on the flexible substrate is combined with highly elastic metal wiring or oxide wiring through a low-temperature process to enhance reliability during repeated bending, reduce the occurrence of cracks or disconnections, and ensure stable transmission of image signals.

[0026] The color film layer and the black matrix (BM) form an anti-reflection stack, wherein the black matrix can be a metal absorption layer or an inorganic high-light absorption layer, which reduces the reflective brightness of the panel surface by efficiently absorbing external incident light and significantly improves visibility in strong light environments.

[0027] The overall thickness of the flexible AMOLED display panel is 10% to 30% smaller than that of traditional solutions using polarizers, and it maintains stable display performance in a continuously bent or curled state. Its power consumption is 10% to 20% lower than that of flexible AMOLED panels that do not use COE technology.

[0028] A protective film (OC film) may be attached to the outermost side of the color film layer. The protective film material has good scratch resistance and durability, and is used to enhance the surface protection and optical performance stability of the panel when it is folded or curled multiple times.

[0029] Example 1 like Figure 1-2 As shown, the method for preparing a flexible low-power AMOLED display panel based on COE technology includes the following steps: S101, cutting the polyimide film into a specified size, and then performing an annealing and cleaning process; S102, coating photoresist on the cleaned surface of the flexible substrate, forming a predetermined circuit pattern through exposure and development, and depositing a metal conductor layer using CVD technology.

[0030] S103, sequentially evaporating red, green, and blue light emitting materials, and adding an organic charge transport layer and an electron blocking layer between each layer of material; S104, depositing on the OLED light-emitting layer using atomic layer deposition (ALD) technology; S105, alternately depositing organic layers between the inorganic layers, using epoxy resin material to fill the gaps and enhance flexibility, with each layer thickness controlled to be approximately 2 μm; S106, repeatedly depositing to form three pairs of organic / inorganic alternating layers, with a total thickness controlled within 10 μm; S107, using photolithography technology to form a grid pattern on the surface of the color filter layer to separate the RGB sub-pixel areas; S108, spraying red, green, and blue three high-transmittance color materials in the grid area respectively; S109, spraying a black matrix material in the sub-pixel gap area; S1010, coating an optically transparent adhesive on the outer side of the color film layer; S1011. Cover with a transparent protective film.

[0031] In this embodiment, the processing method in step S1 is: Annealing treatment is performed at 300°C for 2 hours to eliminate stress inside the material and improve the flexibility of the flexible substrate; Plasma cleaning technology is used to remove impurities and oxides on the surface of the flexible substrate to ensure a clean surface and provide good bonding strength for subsequent processes.

[0032] In this embodiment, the metal wire layer in step S2 is preferably made of aluminum or copper indium tin oxide (ITO) to ensure conductivity and stability; In this embodiment, the inorganic layer in step S4 is made of silicon nitride (SiN x ) or aluminum oxide (Al2O3), with thickness controlled within 200nm; In this embodiment, the protective film in step S12 is made of a high-hardness transparent polymer and has a thickness of 50 μm.

[0033] In this embodiment, the flexible substrate can be made of polyimide (PI) film, polyethylene terephthalate (PET) or other flexible polymer materials to ensure its flexibility. In step S2, a silicon nitride (SiNx) or silicon oxide (SiO2) protective layer should be deposited on the metal wire layer to prevent metal aging and improve the long-term reliability of the driving circuit. Red, green and blue light emitting materials are evaporated, and the preferred materials are triplet organic compounds, such as Ir(ppy)3 for green light emission; organic charge transport layers, such as NPB (1,4-diaminodiphenyl) and electron blocking layers BPhen (benzophenanthroline), are evaporated with precisely controlled evaporation rate and film thickness to ensure high luminous efficiency and color performance. The preferred materials in the grid area are organic pigments. For red, phosphorescent materials, organic DCM2 or triphenylamine derivatives can be used; for green, europium complexes or Ir(ppy)3 can be used; and for blue, anthracene compounds or pyrrolopyrrole dione (PDI) materials can be used. Black matrix materials are preferably carbon nanotubes or inorganic oxides (such as ITO / zinc oxide), which absorb ambient light and reduce reflections, improving contrast. Optically clear adhesives (OCA) are preferably acrylic adhesives, with a refractive index that matches that of the color filter layer to reduce interfacial reflections. Transparent protective films can be made of polycarbonate (PC) or polymethyl methacrylate (PMMA), and self-healing materials can also be selected to improve scratch resistance, service life, and environmental adaptability.

[0034] Example 2 In this embodiment, a process for preparing a display panel with a conventional POL polarizer structure based on a common panel is provided. As a control group for Example 1, a comparative test is conducted on the flexible low-power AMOLED display panel based on COE technology. The specific steps for preparing the display panel with a conventional POL polarizer structure are as follows: S1: In a clean room environment, the pre-cut polyvinyl alcohol (PVA) film was ultrasonically cleaned in anhydrous ethanol and deionized water for 10 minutes each. After being taken out, it was baked on a hot plate at 60 degrees Celsius for 20 minutes. After drying, it was placed in a UV ozone cleaning machine for 5 minutes.

[0035] S2: Spin-coat the polyvinyl alcohol thickener solution on the surface of the cleaned and dried PVA film at a speed of 3000 rpm. After spin coating, place the sample in an 80-degree Celsius oven for 15 minutes. After taking it out, cool it to 25 degrees Celsius at room temperature to ensure uniform distribution of the solution on the surface of the PVA film.

[0036] S3: The cooled PVA film is placed in a constant temperature and humidity chamber (humidity of about 75%, temperature of about 40 degrees Celsius) for uniaxial stretching; the stretching ratio is set to 2 times, and the stretched state is maintained for 3 minutes; after completion, the stretched film is quickly baked at 100 degrees Celsius for 10 minutes to temporarily solidify the orientation structure; after cooling, a preliminarily oriented polarizing substrate is obtained.

[0037] S4: Iodine solution was added to the oriented PVA film by immersion for coloring; the immersion time was set to 60 seconds, followed by rapid baking at 120 degrees Celsius for 5 minutes; after cooling again at room temperature for 2 minutes, the film was immersed in a dichroic dye solution for secondary coloring for 45 seconds; then the sample was placed at 100 degrees Celsius and baked for 10 minutes to obtain a dyed PVA film with a higher degree of polarization.

[0038] S5: Spin-coat a moisture-proof optical coating (e.g., acrylic optical adhesive) onto the double-colored PVA film at 2000 rpm. After spin coating, place the sample on a 90°C hot plate for curing for 10 minutes. After curing, cool the sample to room temperature to ensure that the coating surface is flat and tightly bonded to the PVA film.

[0039] S6: Triacetyl cellulose (TAC) protective films are laminated on both sides of the polarizing film. Before lamination, the TAC film is spin-coated with optical adhesive at a speed of 3000 rpm and pre-baked at 100 degrees Celsius for 5 minutes. Then, a hot press laminator is used to heat-press the TAC film and PVA film at a pressure of 0.2 MPa at 70 degrees Celsius for 2 minutes to firmly bond the TAC film to the PVA film.

[0040] S7: The polarizing film with the protective layer attached is fed into a tension-reducing cutting system for wide-width cutting at a line speed of 1 meter per minute. After cutting, the edges are finely trimmed to ensure that they match the size specifications of the flexible AMOLED. The stripped polarizer is dried at 60 degrees Celsius for 30 minutes to remove trace moisture during the cutting process.

[0041] S8: Bond the finished polarizer to the flexible AMOLED substrate. First, spin-coat an acrylic-based optical adhesive on the AMOLED substrate at 2000 rpm. Then, place the polarizer on top of it, remove bubbles through a vacuum lamination process, and maintain it at 50 degrees Celsius for 10 minutes for initial curing. Finally, place the device at room temperature for 24 hours to complete the overall curing.

[0042] The traditional POL polarizer prepared by the above preparation method can effectively obtain a high degree of polarization and excellent optical uniformity due to the uniaxial stretching and double coloring treatment in the PVA film; then, by spin-coating a moisture-proof optical coating on the surface of the polarizing film and laminating a TAC protective film, the durability and mechanical strength of the film can be further improved; in the final lamination and lamination process, low-temperature pressurization and vacuum exhaust methods are used to ensure that there are no bubbles or wrinkles at the lamination interface between the polarizer and the flexible AMOLED panel, thereby taking into account the optical performance and flexibility requirements of the display panel. The entire process uses relatively simple and easy-to-control preparation methods such as solution spin coating and hot pressing, which is conducive to large-scale production and reduces overall costs. Through the application of this traditional POL polarizer in flexible AMOLED, the contrast can be effectively improved while maintaining high transmittance, and it also has reliable bending life and environmental stability.

[0043] like Figure 3 As shown in FIG, the reflectivity comparison curves of Example 1 and Example 2 are measured. Since the black matrix and black PDL layer in the COE have strong absorption of light, part of the ambient light and the light reflected by the cathode will be blocked by these layers, thereby reducing the overall reflection intensity. Figure 4 As shown in FIG, the power consumption comparison curves of Example 1 and Example 2 at the same brightness are measured. It can be seen from the figure that the flexible low-power AMOLED display panel based on COE technology has significantly lower reflection intensity and lower power consumption.

[0044] Example 3 In this embodiment, a method for manufacturing a flexible AMOLED display screen is provided, such as Figure 5 As shown, the manufacturing method refers to the general manufacturing steps of AMOLED display screens in a broad sense, which can serve as a supplement to the manufacturing of Example 1. By laying the foundation for the basic processes such as flexible substrate preparation, film stacking and packaging methods described in Examples 1 and 2, this embodiment further presents the special processing and subsequent processes of the panel with a hole area. While taking into account the technical advantages of the previous embodiments, this method is particularly optimized for the filling, protection and segmentation and removal of the hole area. The manufacturing method includes: Step S301, coating PI glue on a glass substrate and then drying it to form a PI film layer; Step S302, fabricating a plurality of metal wires and metal blocks on the PI film layer to form an anode layer; Step S303, depositing a light-emitting layer and a cathode layer in sequence on the anode layer; Step S304, packaging the glass substrate with the panel having the hole area; Step S305, filling the hole area of each panel on the packaged glass substrate; Step S306: peeling the PI film layer from the glass substrate, and then performing a cutting process to cut out the filling material in the hole area of each panel; Step S307, assembling the circuit board, polarizer, and cover plate onto the panel of the glass substrate after the cutting process; Step S308 , testing the manufactured flexible AMOLED display screen.

[0045] In this embodiment, steps S201 to S203 are performed to fabricate the PI film layer, anode layer, light-emitting layer, and cathode layer. After the above structures are fabricated, they are packaged. After packaging, the hole area of each panel is filled to prevent stress damage to the film layer during PI film peeling. This process, based on the film deposition and substrate pretreatment described in Examples 1 and 2, further emphasizes the protection of the hole area panel in high temperature and high humidity environments, as well as stress control during the subsequent peeling operation.

[0046] In this embodiment, packaging the glass substrate having the hole area panel (Panel) includes the following steps: Depositing a first CVD film layer on the cathode layer of the entire glass substrate; On the first CVD film layer of the entire glass substrate, performing IJP printing on the area except the hole area to form a first IJP film layer; A second CVD film layer is deposited on the entire glass substrate on the first IJP film layer.

[0047] In the above scheme, the encapsulation is performed by sandwiching a first IJP film layer between two CVD film layers, and the two CVD film layers are deposited on the entire glass substrate, while the first IJP film layer is printed to cover the part except the hole area. This is to prevent the part of the first IJP film layer in the hole area from affecting the normal encapsulation effect. Even if it is covered here, it needs to be removed in the subsequent processing process.

[0048] Based on the optimization of the properties of the flexible substrate PI film layer and the stacking design of the organic / inorganic package in the aforementioned Examples 1 and 2, the hole area packaging method described in this embodiment can improve the overall packaging reliability while taking into account the protection of the screen edge during the subsequent segmentation and removal of the hole area and the assembly of the polarizer, circuit board and cover plate. The final flexible AMOLED display screen has improved hole area function, bending resistance and overall optical consistency, thereby further expanding and improving the process routes of the previous two embodiments. The above process flow can be appropriately combined with automated bonding and detection methods to quickly achieve mass production and effectively ensure product yield and the final display effect.

[0049] Example 4 In this embodiment, a manufacturing equipment module for a flexible low-power AMOLED display panel based on COE technology is provided, such as Figure 6 As shown, the production equipment module includes: Annealing unit: used to anneal the flexible substrate to eliminate internal stress; Cleaning unit: uses plasma cleaning technology to remove impurities and oxides on the surface of the substrate; Evaporation unit: used to sequentially deposit red, green, and blue light-emitting materials and charge transport layers; Encapsulation unit: used for alternating deposition of organic / inorganic layers to form multi-layer encapsulation; Color filter unit: used for photolithography and spraying technology to form color filter layer and black matrix; Protective film unit: coated with transparent adhesive and attached with transparent protective film.

[0050] Preferably, the annealing unit of the device has a temperature control function and can accurately adjust the annealing temperature; the evaporation unit supports multi-target evaporation to improve deposition efficiency.

[0051] In summary, this invention innovatively applies COE (Color On Encapsulation) technology to flexible AMOLED display panels, effectively solving the problems of increased polarizer thickness, reduced light transmittance, and significantly increased power consumption in traditional display technologies while also significantly improving display quality and device compatibility. By directly depositing a color filter layer on a flexible substrate, this invention successfully reduces the need for polarizers, thereby reducing the overall panel thickness by approximately 10% to 20%. By optimizing the optical design of the color filter layer, power consumption is reduced by 15% to 25%. Furthermore, the combination of the color filter layer and the black matrix significantly enhances contrast and color saturation, improving display uniformity across viewing angles and significantly enhancing the user experience. The encapsulation technology employed in this invention utilizes an alternating organic / inorganic layer design, leveraging the water and oxygen barrier properties of the inorganic layer and the flexibility of the organic layer to create a highly reliable protective structure. Compared to existing encapsulation technologies, this structure demonstrates greater stability in flexural tests, with a flex lifespan increased by approximately 30%. After 30,000 folds, the display maintained brightness retention exceeding 95%, with no delamination or cracking. In addition, the optimized processing of the flexible substrate and improvements to the drive circuit layer further enhance the mechanical stability of the structure, ensuring stable electrical performance during long-term use. By adding a transparent protective film and an optically transparent adhesive, the panel of the present invention exhibits higher readability in strong light environments. The protective film is made of a high-hardness transparent polymer material, which not only improves scratch resistance but also enhances the device's environmental adaptability. The panel can still maintain excellent display performance in extreme environments such as high temperature and high humidity, which provides greater adaptability for special application scenarios such as in-vehicle displays and wearable devices. In addition, the present invention also provides a flexible AMOLED display screen production equipment based on COE technology. The modular design of the equipment includes annealing, cleaning, evaporation, packaging, color film, protective film and other units, enabling fully automated high-precision production, greatly improving production efficiency and product yield. The annealing unit has precise temperature control capabilities, the evaporation unit supports multi-target deposition, and the color film unit combines photolithography and spray coating technologies to quickly generate high-quality RGB sub-pixel areas. Compared with traditional solutions using polarizers, the technical route of the present invention has significant cost advantages and simplified process features. The application of COE technology not only optimizes optical performance, but also effectively reduces the thickness accumulation problem caused by multi-layer stacking, further meeting the market demand for lightweight and highly flexible devices. The process method of the present invention is simple and easy to implement, suitable for a variety of large-scale production scenarios, and has significant advantages in product performance, manufacturing cost and production efficiency. In short, the present invention innovatively integrates COE technology, flexible material processing technology and efficient packaging structure design, providing a new technical solution for high-end display devices.Whether it is a foldable screen mobile phone, wearable device, or car display, the flexible low-power AMOLED display panel of the present invention has demonstrated excellent performance and market potential, and has played an important role in promoting technological progress and industrial upgrading in the display industry.

[0052] The above description in conjunction with the accompanying drawings is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Flexible AMOLED display panel based on COE technology, characterized by: The display panel includes a flexible substrate, a driving circuit layer, an OLED light-emitting layer, and an encapsulation layer stacked in sequence, and a color filter layer is directly formed on the outer surface of the encapsulation layer.

2. The flexible AMOLED display panel based on COE technology according to claim 1, characterized in that: The flexible substrate is made of a polymer material with a flexible property.

3. The flexible AMOLED display panel based on COE technology according to claim 1 or 2, characterized in that: The color filter layer includes color materials corresponding to the red, green and blue sub-pixel regions, and a black matrix arranged at the gaps between the sub-pixels.

4. The flexible AMOLED display panel based on COE technology according to claim 3, characterized in that: The encapsulation layer is a multilayer structure formed by alternating stacking of organic barrier films and inorganic barrier films, which is used to prevent water vapor and oxygen from penetrating into the OLED light-emitting layer; the color filter layer is directly deposited or coated on the surface of the encapsulation layer.

5. The flexible AMOLED display panel based on COE technology according to claim 4, characterized in that: An optically transparent adhesive layer is further provided between the encapsulation layer and the color filter layer, and its refractive index matches or approximately matches that of the color filter layer; the optically transparent adhesive layer is elastic.

6. The flexible AMOLED display panel based on COE technology according to claim 5, characterized in that: The color material transmittance of the color film layer is not less than 70% in the visible light band and has good optical stability, so that the operating current required to drive the OLED light-emitting layer under the same brightness conditions is reduced.

7. The flexible AMOLED display panel based on COE technology according to claim 6, characterized in that: The driving circuit layer formed on the flexible substrate is combined with the highly elastic metal wiring or oxide wiring through a low-temperature process.

8. The flexible AMOLED display panel based on COE technology according to claim 7, characterized in that: The color filter layer and the black matrix form an anti-reflection stack, wherein the black matrix can be a metal absorption layer or an inorganic high light absorption layer.

9. The flexible AMOLED display panel based on COE technology according to claim 8, characterized in that: A protective film may be attached to the outermost side of the color film layer. The protective film material is scratch-resistant and durable, and is used to enhance the surface protection and optical performance stability of the panel when it is folded or curled multiple times.

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