A lens structure containing cf

Abstract

The utility model relates to OLED color display technical field discloses a kind of lens structure containing CF, including the lens structure of CF with " bottom layer support - stratified coating - curved surface forming - integrated etching " as core process, through the collaborative design of bottom layer packaging structure, photoresist layer, first lens layer, color glue layer and second lens layer, realize " light filtering - light convergence " function integration, solve the light loss and thick problem of traditional OLED color display.The utility model substantially shortens the distance between color glue layer and lens layer, directly reduces the optical path loss in the propagation process of light;At the same time, color glue layer is embedded in lens layer to realize " light filtering - light convergence simultaneously", avoid the reflection and scattering loss of light in interface in traditional separate structure, and color glue layer is embedded between two lens layers, compared with traditional scheme, the thickness of photoresist layer can be reduced by 1-1.5 μm, and the overall structure is lighter and thinner.

Description

Technical Field

[0001] This utility model patent belongs to the field of OLED color display technology, specifically relating to a lens structure containing CF (color film), and particularly to AMOLED and micro-OLED. Background Technology

[0002] With the continuous maturation of OLED (Organic Light Emitting Diode) technology, OLED displays, based on the principle of self-emission, possess significant advantages in display effect, response speed, and thinness, and are applied in smartphones, televisions, laptops, and smart wearable devices. Compared to traditional AMOLED display technology, micro-OLED is widely used in the VR and AR fields, and currently, mainstream VR and AR products all use micro-OLED displays.

[0003] Especially for color displays, it is difficult to achieve high-resolution screen manufacturing using traditional FMM technology. Currently, high-resolution and color displays are mainly achieved by using white OLEDs with color filters. In this method, more than 50% of the light emitted by the OLED is lost after passing through the color filter, making it difficult for the product to achieve high brightness.

[0004] In the field of OLED color display, existing technologies have always struggled to balance high resolution, high brightness, and thinness. Among them, the technology of white OLED with color filters works by emitting full-spectrum light from the white OLED and then filtering it through red color filter (R-CF), green color filter (G-CF), and blue color filter (B-CF) to achieve color display. Although this avoids the precision limitations of FMM, it results in severe light loss and excessive structural thickness.

[0005] The lens layer (short for "lens layer") is a type of transparent optical component with light control function. It is widely used in display technology (such as OLED, LCD), imaging equipment (cameras, microscopes), optical sensors and other fields. Its core function is to achieve precise control over the direction, intensity, distribution or polarization state of light through material properties and structural design. In the field of OLED color display, the lens layer adopts a curved structure design, which can converge the divergent light emitted by the B / G / R pixels in the underlying encapsulation structure, reduce the escape of light to non-display directions (such as internal scattering of the structure and interface reflection), and directly improve the brightness of the screen output.

[0006] Therefore, developing an optical design that integrates CF and lens functions, shortens the optical path, and thins the structure has become a key requirement for breaking through the bottleneck of micro-OLED color display and promoting the upgrade of near-eye display technology. Utility Model Content

[0007] The purpose of this invention is to provide a lens structure containing CF, which reduces light loss and thins the structure by integrating "light filtering and light focusing" functions, thereby improving the brightness and thinness of OLED color displays. This structure can be achieved through dry etching technology, thereby improving light extraction efficiency.

[0008] Based on the above concept, the technical solution adopted by this utility model is as follows: A lens structure containing CF includes an underlying packaging structure, a photoresist layer, a first lens layer, a color resist layer, and a second lens layer; The upper surface of the underlying packaging structure is covered with a photoresist layer; A lens layer is placed over the photoresist layer to improve the flatness of the photoresist layer; A colored adhesive layer is provided above the lens layer; A lens layer is also provided above the colored adhesive layer.

[0009] Preferably, the colored adhesive layer includes B colored adhesive, G colored adhesive and R colored adhesive.

[0010] Preferably, there is a gap between the B-color adhesive, G-color adhesive and R-color adhesive, and the gap is covered with a second lens layer.

[0011] Preferably, the first and second lens layers are curved structures, and the B-color adhesive, G-color adhesive, and R-color adhesive are completely encapsulated within the two lens layer structures.

[0012] Preferably, the thicknesses of the B-color adhesive, G-color adhesive, and R-color adhesive are in the order: R-color adhesive > G-color adhesive > B-color adhesive.

[0013] Preferably, the positions of the B-color film, G-color film, and R-color film correspond to the B, G, and R sub-pixels in the underlying encapsulation structure.

[0014] Preferably, the thickness of the first lens layer is smaller than that of the second lens layer.

[0015] Preferably, the curved structure of the second lens layer is formed with the aid of reflow adhesive. The reflow adhesive covers the second lens layer and forms a preset curved surface after exposure and development.

[0016] A method for preparing the aforementioned lens structure, characterized by comprising the following steps: S1. Based on the underlying packaging structure, photoresist is spin-coated using a coating machine and then baked. S2. Spin coat the lens with a coating machine to cover the first lens layer on the photoresist leveling base, and then bake it. S3. Apply, expose and develop the color paste above the first lens layer to leave B color paste above the B pixel; S4. Repeat step S3 to apply, expose and develop the color paste above the first lens layer, leaving G color paste and R color paste above the G and R pixels respectively. S5. Spin-coat the second lens layer over the colored adhesive layer; S6. Spin-coat reflow adhesive. After coating, exposure and development, a reflow curved surface structure is formed. Only the curved surface part above the second lens layer is retained, and excess reflow adhesive at the edges is removed. S7. A dry etching method is used to finally form a lens structure containing a colored adhesive layer.

[0017] The beneficial effects of this utility model are as follows: 1. This utility model uses a structural design that integrates and etches the colored adhesive layer and the lens layer in layers, which significantly shortens the distance between the colored adhesive layer and the lens layer, directly reducing the optical path loss during light propagation. At the same time, the colored adhesive layer is embedded inside the lens layer to achieve "synchronous filtering and focusing", avoiding the light reflection and scattering loss at the interface in the traditional separate structure.

[0018] 2. This utility model optimizes the height difference of the underlying layer by using photoresist self-leveling and embeds the color resist layer between two lens layers. Compared with the traditional solution, it can reduce the thickness of the photoresist layer by 1-1.5μm, resulting in a thinner overall structure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the underlying packaging structure of this utility model.

[0021] Figure 3 This is a schematic diagram of spin-coating photoresist on the bottom packaging structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the first lens layer covering the photoresist of this utility model.

[0023] Figure 5 This is a schematic diagram of the preparation of B-color adhesive on the first lens layer of this utility model.

[0024] Figure 6 This is a schematic diagram of the preparation of G-color adhesive on the first lens layer of this utility model.

[0025] Figure 7 This is a schematic diagram of the preparation of R-color adhesive on the first lens layer of this utility model.

[0026] Figure 8 This is a schematic diagram of the second lens layer covered by this utility model.

[0027] Figure 9 This is a schematic diagram of spin-coating reflow adhesive onto the second lens layer of this utility model.

[0028] Figure 10 This is a schematic diagram of the reflow surface structure of this utility model. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0030] A lens is a core optical component whose primary function is to control the propagation state of light (direction, intensity, distribution, polarization, etc.) to meet the optical requirements of different scenarios. Lenses are widely used in display, imaging, lighting, sensing, and other fields. When the lens layer is a convex lens with a "thick center and thin edges," such as a spherical or aspherical convex lens, parallel incident light, after being refracted by the upper and lower surfaces of the lens layer, will converge towards the optical axis of the lens, ultimately forming a focal point or "quasi-parallel light," thereby increasing the local light intensity. This invention achieves both filtering and focusing within the lens by layering lens materials and etching the CF adhesive.

[0031] like Figures 1 to 10 As shown, the lens structure of this utility model, including CF, uses "bottom support - layered coating - curved surface forming - integrated etching" as the core process. Through the collaborative design of the bottom encapsulation structure, photoresist layer, first lens layer, color adhesive layer and second lens layer, the "light filtering - light focusing" function is integrated, solving the problems of light loss and thickness in traditional OLED color displays.

[0032] To achieve the above effects, the structure in this embodiment is as follows: This utility model includes a bottom packaging structure, a photoresist layer, a first lens layer, a color adhesive layer, and a second lens layer; The upper surface of the underlying packaging structure is covered with a photoresist layer; A lens layer is placed over the photoresist layer to improve the flatness of the photoresist layer; A colored adhesive layer is provided above the lens layer; A lens layer is also provided above the colored adhesive layer.

[0033] To achieve the above structure, the following implementation method is described: In this embodiment, the coating machine is started to spin-coat photoresist onto the upper surface of the bottom packaging structure: the coating machine speed is set to 3000 r / min and the spin-coating time is 20s. The self-leveling properties of the photoresist are used to fill the tiny depressions on the surface of the bottom packaging structure. After the spin-coating is completed, the structure is placed in an oven for baking. The baking temperature is set to 80℃ and the time is 30min to allow the photoresist layer to solidify and form a uniform coating.

[0034] Furthermore, in this embodiment, the photoresist is OC.

[0035] In this embodiment, after the photoresist is cured, a lens material is spin-coated on top of the photoresist layer to form the initial coating of the first lens layer; then it is placed in an oven for a second baking. The thickness of the first lens layer is set to 2μm, which is smaller than the subsequent second lens layer, so as to ensure the support strength and avoid the structure being too thick.

[0036] In this embodiment, the preparation process of the B color adhesive includes spin coating the B color adhesive on the upper surface of the first lens layer, then aligning it with the B sub-pixel area of ​​the underlying packaging structure through a photolithography exposure machine for 15 seconds, then developing it with a developer to remove the B color adhesive in the non-B sub-pixel area, leaving only the B color adhesive directly above the B sub-pixel, and finally baking and curing to form a B color adhesive with uniform thickness. In this embodiment, the preparation process of the G color film and the R color film repeats the above process. First, the G color film is spin-coated, aligned with the G sub-pixel, exposed and developed, and then cured to form a G color film with uniform thickness. Then, the R color film is spin-coated, aligned with the R sub-pixel, exposed and developed, and then cured to form an R color film with uniform thickness. Finally, the thickness of the color film layer satisfies "R color film > G color film > B color film".

[0037] In this embodiment, there is a gap between the adjacent colored adhesives, with no colored adhesive residue in the gap, and the central axis of all colored adhesives coincides with the central axis of the corresponding sub-pixel, ensuring that the subsequent second lens layer can completely cover the gap.

[0038] In this embodiment, the coating machine rotates at 2800 r / min and spins the lens material over the colored adhesive layer and the gaps to form the initial coating of the second lens layer. The thickness of the second lens layer is 3 μm. This coating not only completely covers the upper surface of the R, G, and B colored adhesives, but also fills the gaps between the colored adhesives, achieving "no exposure of colored adhesives".

[0039] In this embodiment, reflow adhesive is spin-coated onto the upper surface of the second lens layer: the spin coater speed is set to 3200 r / min and the spin coating time is 18s to form a uniform coating with a thickness of 1.5μm; then the structure is placed in a photolithography exposure machine, and the reflow adhesive is exposed and defined based on the curved surface of the second lens layer. After development, the excess reflow adhesive is removed, and only the reflow adhesive above the R, G, and B color adhesives is retained to form a reflow adhesive curved surface structure.

[0040] In this embodiment, an inductively coupled plasma (ICP) dry etching process is used to etch the overall structure of "bottom layer packaging - photoresist - first lens - color resist - second lens - reflow adhesive". The outer contour of the lens structure is defined by a mask, and excess material at the edges is removed. After etching, the surface of the structure is cleaned with deionized water and then dried with nitrogen gas to finally form a complete CF-containing lens structure.

[0041] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A lens structure containing CF, characterized in that, It includes the underlying packaging structure, photoresist layer, first lens layer, color adhesive layer and second lens layer; The upper surface of the underlying packaging structure is covered with a photoresist layer; A first lens layer is covered above the photoresist layer to improve the flatness of the photoresist layer; A colored adhesive layer is provided above the first lens layer; A second lens layer is also provided above the colored adhesive layer.

2. The lens structure containing CF according to claim 1, characterized in that, The colored adhesive layer includes B colored adhesive, G colored adhesive and R colored adhesive.

3. A lens structure containing CF according to claim 2, characterized in that, There are gaps between the B-color adhesive, G-color adhesive and R-color adhesive, and the gaps are covered with a second lens layer.

4. A lens structure containing CF according to claim 2, characterized in that, The thicknesses of the B-color adhesive, G-color adhesive, and R-color adhesive are as follows: R-color adhesive > G-color adhesive > B-color adhesive.

5. A lens structure containing CF according to claim 1, characterized in that, The first and second lens layers are curved structures, and the B-color film, G-color film and R-color film are completely encapsulated in the two lens layer structures.

6. A lens structure containing CF according to claim 1, characterized in that, The thickness of the first lens layer is smaller than that of the second lens layer.

7. A lens structure containing CF according to claim 2, characterized in that, The positions of the B-color film, G-color film, and R-color film correspond to the B, G, and R sub-pixels in the underlying encapsulation structure.

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