Functional layer and micro-display device with same
By setting isolation gaps and filling isolation layers in Micro OLED display devices, the current transmission between adjacent pixels is blocked, the crosstalk problem is solved, the display quality is improved, and the manufacturing complexity and cost are reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2026-03-20
AI Technical Summary
In Micro OLED displays, due to the small pixel size, the OLED material is vapor-deposited across the entire surface, causing current transmission in the organic layer between adjacent pixels, resulting in light crosstalk and affecting color gamut and display quality.
By setting isolation gaps on the light-emitting unit and filling them with isolation layers, the current transmission path between adjacent pixels is blocked, and a conductive adhesive layer is deposited on the cathode layer to connect adjacent pixels, forming a discontinuous OLED film structure.
It effectively reduces light crosstalk, improves the color gamut and resolution of display devices, and simplifies the manufacturing process and reduces costs.
Smart Images
Figure CN224022196U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to micro OLED display technical field, and specifically is a functional layer and micro display device with the functional layer. BACKGROUND
[0002] In the product of micro OLED, because the pixel size is small, the evaporation of OLED material cannot be suitable for FMM (fine metal mask), so the OLED material is all evaporation of whole surface, and the organic layer between adjacent pixels is easy to have mutual transmission of current.
[0003] And the horizontal current transmission of organic material between adjacent pixels will cause abnormal light emission of pixels, which causes the phenomenon of light leakage, resulting in color cast, reduced color gamut and other problems.
[0004] If the transmission path of current between adjacent pixel organic layers can be blocked, the light leakage effect can be reduced, which is generally achieved by breaking the OLED film layer through special structure design; for example, the patent US010651242B2 proposes to set an insulating dam on the PDL (pixel definition layer) between adjacent pixels to disconnect the OLED film layer; although the patent can improve the above problems to some extent, the overall structure is complex and the preparation process is cumbersome.
[0005] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the film layer structure of the existing micro display device. CONTENT OF THE UTILITY MODEL
[0006] The utility model aims at providing a film layer structure capable of improving the light leakage of micro OLED.
[0007] In order to achieve the above purpose, the utility model adopts the technical scheme that:
[0008] A functional layer, comprising a substrate, the substrate is provided with a light emitting unit; the light emitting unit comprises an anode layer, a pixel definition layer, an organic layer and a cathode layer; the light emitting unit is provided with an isolation notch; the isolation notch extends from the cathode layer to the pixel definition layer.
[0009] The isolation notch extends from the cathode layer through the organic layer and the pixel definition layer to the substrate.
[0010] The isolation notch is etched by etching process.
[0011] The isolation notch is provided with an isolation layer.
[0012] The isolation layer is one of BM glue or resin.
[0013] A micro display device, comprising the functional layer; the functional layer is provided with a conductive adhesive layer.
[0014] The micro display device further comprises an encapsulation layer, and the conductive adhesive layer is located between the functional layer and the encapsulation layer.
[0015] The encapsulation layer is provided with a module film layer away from the conductive adhesive layer.
[0016] The micro display device has the advantages that;
[0017] The utility model discloses a functional layer and micro display device with the functional layer.
[0018] The utility model discloses a functional layer and micro display device with the functional layer.
[0019] The utility model discloses a functional layer and micro display device with the functional layer. BRIEF DESCRIPTION OF DRAWINGS
[0020] The contents expressed by each drawing of the utility model specification and the mark in the drawing are briefly explained as follows:
[0021] Figure 1 It is the film layer structure schematic diagram of micro display device of the utility model.
[0022] Figure 2 It is the film layer structure schematic diagram after anode layer preparation of the utility model.
[0023] Figure 3 It is the film layer structure schematic diagram after pixel definition layer preparation of the utility model.
[0024] Figure 4 It is the film layer structure schematic diagram after cathode layer preparation of the utility model.
[0025] Figure 5 It is the film layer structure schematic diagram after isolation notch preparation of the utility model.
[0026] Figure 6 It is the film layer structure schematic diagram after isolation layer preparation of the utility model.
[0027] Figure 7 It is the film layer structure schematic diagram after conductive adhesive layer preparation of the utility model.
[0028] The mark in the above-mentioned drawing is all:
[0029] 1. Substrate, 2. Anode layer, 3. Pixel definition layer, 4. Organic layer, 6. Isolation notch, 61. Isolation layer, 7. Conductive adhesive layer, 8. Encapsulation layer, 9. OC1 layer, 10. CF layer, 11. OC2 layer, 12. Cover plate. Detailed Implementation
[0030] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.
[0031] A functional layer includes a substrate 1, on which a light-emitting unit is disposed; the light-emitting unit includes an anode layer 2, a pixel definition layer 3, an organic layer 4, and a cathode layer 5; the light-emitting unit is provided with an isolation notch 6; the isolation notch 6 extends from the cathode layer 5 to the pixel definition layer 3; in this utility model, the substrate 1 serves as the foundation of the entire device, facilitating the arrangement of subsequent film layers; typically, monocrystalline silicon, glass, or flexible materials can be selected.
[0032] In this invention, the light-emitting unit is the core component of the OLED display panel, responsible for generating and displaying images. The light-emitting unit includes an anode layer 2, a pixel definition layer 3, an organic layer 4, and a cathode layer 5. The main function of the anode layer 2 is to inject holes (positive charges) into the organic layer 4. It is typically made of a high work function conductive material, such as ITO (indium tin oxide) or a metal oxide. The pixel definition layer 3 defines the boundary of each pixel, preventing interference between the current and light-emitting materials of adjacent pixels.
[0033] It is typically made of insulating materials, such as photoresist or polyimide; through precise patterning, the pixel definition layer 3 can improve the resolution and contrast of the display panel.
[0034] Organic layer 4 is a key component of OLED light emission. It consists of multiple layers of organic materials, including a hole injection layer (HIL), a hole transport layer (HTL), an emissive layer (EML), an electron transport layer (ETL), and an electron injection layer (EIL). These layers work together to convert electrical energy into light energy. When current passes through organic layer 4, holes and electrons recombine in the emissive layer to form excitons. When the excitons de-excite, they release photons, thus achieving light emission. Organic layer 4 is usually composed of small-molecule organic materials or polymer materials, which have good luminous efficiency and stability.
[0035] The main function of the cathode layer 5 is to inject electrons into the organic layer 4; it is usually made of a metal material with a low work function, such as aluminum (Al) or magnesium silver alloy (Mg:Ag); the cathode layer 5 can be transparent (such as using materials such as Ca or LiF), or it can be translucent or opaque, depending on the design requirements of the display panel.
[0036] And the isolation gap 6: from the cathode layer 5 to the pixel definition layer 3, the OLED film layer between adjacent pixels is etched off by etching method, so that the material is discontinuous; This design can effectively block the horizontal current transmission of the organic layer 4 between adjacent pixels, thereby reducing the light leakage effect.
[0037] The utility model discloses a light emitting unit is carved, after carving the cathode layer 5, organic layer 4 and pixel definition layer 3, prepares the isolation layer 61 in the carved gap, makes the OLED film layer evaporation not continuous, and then a whole layer of conductive adhesive layer 7 is plated on the disconnected cathode to be connected, so that the transmission path of the current between adjacent organic layers 4 is blocked, and the light leakage effect is reduced.
[0038] Further, in the utility model, the isolation gap 6 is extended to the base 1 through the organic layer 4 and the pixel definition layer 3 from the cathode layer 5, and the purpose of this structure is to more thoroughly block the current transmission path between adjacent pixels, thereby more effectively reducing the light leakage effect; The isolation gap 6 starts from the cathode layer 5, passes through the organic layer 4 and the pixel definition layer 3, and extends to the base 1, and the gap of this depth can ensure that the current transmission path between adjacent pixels is completely cut off.
[0039] The isolation gap 6 is usually in the form of a strip or a grid, and the specific shape depends on the arrangement of the pixels and the design requirements.
[0040] The formation of the isolation gap 6 is usually achieved through an etching process, and the gap after etching can be filled with insulating material to further enhance the isolation effect.
[0041] Further, in the utility model, the isolation gap 6 is etched by etching process; Such an operating mode facilitates the processing and forming of the isolation gap 6, and the etching process can use dry etching or wet etching as needed.
[0042] In the utility model, the isolation gap 6 is provided with an isolation layer 61; The isolation gap 6 is filled with the isolation layer 61 material to enhance the isolation effect; Better reduce the light leakage effect.
[0043] Meanwhile, in the utility model, the isolation layer 61 is one of BM glue or resin; BM glue is a kind of black photoresist, which has good insulating property and optical shielding performance, and resin material, such as polyimide (PI), has good insulating property and mechanical performance, and is suitable for filling the isolation layer 61.
[0044] A micro display device comprises the functional layer; The functional layer is provided with a conductive adhesive layer 7; The functional layer disclosed in the utility model is etched to etch the OLED film layer between adjacent pixels, so that the OLED film layer material is discontinuous, so that the horizontal current transmission of the organic layer 4 between two adjacent pixels is blocked, the effect of light leakage is reduced, and the preparation is simple and the cost is low.
[0045] And in the disconnected cathode layer 5 on a layer of conductive glue 7, for connecting the adjacent pixel cathode layer 5, ensure the electrical continuity of the cathode layer 5, while blocking the current transmission of organic layer 4.
[0046] Further, the micro display device in the utility model still includes encapsulation layer 8, the conductive glue layer 7 is located between functional layer and encapsulation layer 8;The encapsulation layer 8 is provided with module film layer away from the conductive glue layer 7 side;Module film layer includes OC1 layer 9, CF layer 10, OC2 layer 11 and cover plate 12;The utility model discloses a micro display device with better optical performance by the setting of encapsulation layer 8 and module film layer;Encapsulation layer 8 can provide good gas barrier property, and the device is protected from the influence of external environment;And OC1 layer and OC2 layer in module film layer: for optical compensation and protection, improve display effect.
[0047] CF layer (color filter layer): for realizing color display, improving color performance through filtering effect.
[0048] Cover plate: usually glass cover plate, plays a protective role and forms a closed space. Specific embodiments
[0049] 1, prepare CMOS driving circuit on silicon wafer substrate 1 to form CMOS substrate;
[0050] 2, prepare Anode (anode) on CMOS substrate; Figure 2 );
[0051] 3, prepare pixel definition layer 3PDL on anode through yellow light process; Figure 3 );
[0052] 4, prepare OLED layer (hole injection / transport layer, organic light-emitting layer, electron injection / transport layer, cathode and other film layers) by evaporation process; Figure 4 );
[0053] 5, the cathode layer 5 and organic layer 4 are etched, including but not limited to laser etching and dry etching and other methods; Figure 5 );
[0054] 6, prepare isolation layer 61 by inkjet printing, isolation layer 61 uses but is not limited to BM glue, resin and the like; Figure 6 );
[0055] 7, prepare a layer of conductive glue on the cathode layer 5, including but not limited to spin coating and inkjet printing and other methods, the composition is mainly composed of resin matrix, conductive particles and dispersion additives, additives and the like to provide cathode power supply; Figure 7 );
[0056] 8. Complete subsequent TFE yellow light and module process (TFE layer, OC1 layer, CF layer, OC2 layer, cover plate (CG) lamination, cutting, etc.).
[0057] Obviously, the specific implementation of the utility model is not limited by the above-mentioned mode, as long as various non-essential improvements are made by adopting the method concept and technical scheme of the utility model, which are within the protection scope of the utility model.
Claims
1. A functional layer, characterized in that, The device includes a substrate on which a light-emitting unit is disposed; the light-emitting unit includes an anode layer, a pixel definition layer, an organic layer, and a cathode layer; the light-emitting unit has an isolation notch; the isolation notch extends from the cathode layer to the pixel definition layer.
2. A functional layer according to claim 1, characterized in that, The isolation gap extends from the cathode layer through the organic layer and the pixel definition layer to the substrate.
3. A functional layer according to any one of claims 1-2, characterized in that, The isolation gap was formed by etching.
4. A functional layer according to claim 1, characterized in that, An isolation layer is provided within the isolation gap.
5. A functional layer according to claim 4, characterized in that, The insulating layer is either BM glue or resin.
6. A microdisplay device, characterized in that, It includes the functional layer as described in any one of claims 1-5; the functional layer is provided with a conductive adhesive layer.
7. A microdisplay device according to claim 6, characterized in that, The microdisplay device further includes an encapsulation layer, and the conductive adhesive layer is located between the functional layer and the encapsulation layer.
8. A microdisplay device according to claim 7, characterized in that, The encapsulation layer has a module film layer on the side away from the conductive adhesive layer.