Flexible full screen design method based on FIP narrow bezel technology

Abstract

The invention discloses a flexible full screen design method based on an FIP narrow bezel technology, and belongs to an AMOLED full screen display screen, according to the flexible full screen design method based on the FIP narrow bezel technology, a driving lead is ingeniously integrated into each pixel unit, so that the width of a bezel area in a traditional display screen is remarkably reduced, fine optimization design is conducted on a pixel circuit through the FIP technology, and the flexible full screen design efficiency is improved. The circuit size is reduced, the position and the direction of a driving lead are reasonably arranged to ensure the normal display function of pixels and the stability of signal transmission, meanwhile, the signal shielding and isolation technology is adopted to reduce signal interference and guarantee the integrity and the reliability of signals, the FIP technology and the FDC under-screen camera technology are combined, and the display effect of the FDC under-screen camera is improved. Cooperative work of a hole-free under-screen camera shooting function and an extreme narrow frame design is realized, and functionality and user experience of the display screen are further improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of AMOLED full-screen display screens, and specifically relates to a flexible full-screen design method based on FIP narrow border technology. Background Art

[0002] With the rapid development of mobile Internet technology, people have put forward higher requirements for the screens of smart phones, hoping for a larger screen-to-body ratio (the ratio of the display screen area to the front panel area of the mobile phone), so as to display more information in a limited space and enhance the visual experience. Since 2017, full-screen mobile phones have risen rapidly, greatly enhancing the visual experience of users.

[0003] Although the full-screen design meets the users' needs for a large screen-to-body ratio to a certain extent, it still has some limitations. In order to further improve the integrity of the screen, major mobile phone manufacturers have continuously innovated and launched various screen design schemes, such as notch screens, water-drop screens, and punch-hole screens. Although these designs improve the screen-to-body ratio to a certain extent, they still cannot achieve a completely unobstructed display effect. At the edge or in the middle of the screen, there will always be irregular shapes such as notches or black holes, which affect the visual experience of users and the integrity of content display. In recent years, with the progress of technology and the continuous upgrading of consumer demands, the market's call for removing notches and black holes has been increasing. Users are eager to have a completely unobstructed screen to obtain a more immersive visual experience. To meet this demand, major mobile phone manufacturers and panel manufacturers have begun to actively explore new technical solutions, and the under-screen camera technology has become an important research direction. Briefly sorted as follows: 1. The first generation of full-screen: Compared with traditional rigid screens, it can achieve a curved screen with reduced upper, lower, left, and right borders; 2. The second generation of full-screen: including notch screens, water-drop screens and other special-shaped grooved or punch-hole screens to improve the screen-to-body ratio; 3. The third generation of full-screen: the under-screen camera technology that hides the camera under the screen, a true full-screen.

[0004] The core of under-screen camera technology is to cleverly hide the camera under the display screen to achieve a true full-screen design. With this technology, the mobile phone screen will no longer be blocked by anything, and users can freely browse the web, watch videos or play games in a complete display area to enjoy a more perfect visual effect. The difficulty of under-screen camera technology lies in how to balance the picture display and photo effect in the camera area. There are many signal traces and metal graphics in traditional display screens, and the camera hidden under the screen needs to pass through various metal graphics in the screen when taking pictures, so the transmittance and light diffraction are problems, and the photo effect is poor. In order to improve the photo effect, major panel manufacturers have proposed various panel improvement designs, such as reducing the display resolution in the camera area, so that the transmittance will definitely increase and improve the photo effect, but obviously the display effect will be greatly reduced. The technical contradiction that the picture display and photo effect cannot be achieved at the same time has consistently troubled the entire industry, making the under-screen camera technology only remain at the conceptual level. Until September 2020, the mass production release of ZTE Axon20, the world's first mobile phone with under-screen camera technology, was epoch-making, and it can be said that it has promoted the industry to officially open the era of under-screen cameras. Soon after, various mobile phone terminal and panel manufacturers launched the under-screen camera technology that they had been developing for many years.

[0005] Currently, the under-screen camera technology on the market can be roughly divided into two solutions: the pixel circuit built-in method (TFT-inside) represented by South Korea's Samsung Fold3, and the pixel circuit external method (TFT-outside) represented by China's ZTE Axon20 and Axon30. However, the under-screen camera technology represented by Samsung Fold3 has an obvious sand window effect and poor display effect because the resolution of the camera area is lower than the resolution of the conventional display area; while ZTE Axon20 and Axon30 use Visionox's one-drive-multiple technology, because the one-to-four array technology is bound to cause display color blocks, partial grayscale loss, and image quality problems such as reduced pixel information (such as jagged edges, etc.).

[0006] In April 2022, BOE launched a new under-screen camera technology, which was applied to the official release of ZTE's third-generation under-screen camera phone Axon 40. This under-screen camera technology is named FDC (Full Display with Camera). Different from the existing one-drive multi-array technology on the market, the FDC under-screen camera technology proposed by BOE uses the same one-drive-one technology as the regular display area even in the camera area, which can ensure that there is no difference in display between the camera area and the regular display area, and truly achieve both photo taking and display.

[0007] Although the FDC under-screen camera technology developed by BOE has made significant progress in achieving a holeless full-screen display, it still faces some technical challenges, especially in achieving an extremely narrow bezel. Since the OLED pixel circuit in the display area needs to be electrically connected to the IC chip in the lower bezel to achieve normal display driving, a large number of driving leads exist in the lower bezel, making it difficult to achieve an extremely narrow bezel like the upper, left, and right bezels. The market and customers have an increasingly urgent need for an extremely narrow bezel, especially in the case of integrating FDC technology, as only a truly full-screen display can provide a more perfect visual experience. Therefore, developing a narrow bezel technology compatible with FDC technology has become a key direction for current technological development. Summary of the Invention

[0008] To solve the problem that the narrow bezel design in the existing FDC under-screen camera technology cannot be effectively achieved, the following solutions are proposed: A flexible full-screen design method based on FIP narrow bezel technology, including: S1: Divide a part of the space inside each pixel unit of the display screen for the layout of driving leads; S2: Adopt signal shielding and isolation technology to ensure that the driving signals of the driving leads are not interfered during transmission; S3: The collaborative work of the FDC+FIP technology combination; conduct pixel circuit design and signal processing of the FDC under-screen camera in the camera area of the display screen to achieve the normal operation of the camera. Combine the FIP narrow bezel technology with the FDC technology, arrange the position and direction of the driving leads of FIP in the pixel circuit in the camera area, avoid interfering with the camera signals, and at the same time, optimize the signal processing algorithm of the FDC technology to adapt to the pixel circuit changes brought by the FIP technology; S4: In the layout design stage, carefully plan the layout of the pixel circuit, and arrange the jumper wires of the FIP driving leads in the pixel circuit columns that are left over after the FDC pixels are compressed.

[0009] Preferably, in S1, specifically: Make space for the driving leads by reducing part of the circuit of the pixel unit or adopting a compact circuit design.

[0010] Preferably, S2 is specifically: Set a shielding layer around the driving leads, or adopt a differential signal transmission method to reduce interference.

[0011] Preferably, S2 also includes optimizing the material and manufacturing process of the driving leads to improve the conductivity and durability of the driving leads.

[0012] Compared with the prior art, the innovation points of this application are: 1. The core innovation of the FIP technology lies in transferring the driving leads from the traditional border area to inside the pixels. This design breaks the traditional layout of separating pixels and borders, enabling the driving leads not to occupy additional border space, thus greatly reducing the border width and increasing the screen-to-body ratio of the display. This innovation not only enhances the aesthetics of the product but also makes it possible to achieve a more nearly full-screen effect.

[0013] 2. The FIP technology realizes the integration of driving leads inside the pixels by optimizing the pixel circuit design. This design not only reduces the size of the pixel circuit, adopts a more compact layout, arranges the position and routing of the driving leads reasonably, and improves the integration and performance of the pixels, but also reduces the interference received by the driving signals during transmission and ensures the integrity and stability of the signals by adopting advanced signal shielding and isolation technologies, such as setting shielding layers and differential signal transmission methods. This lays the foundation for the realization of narrow border technology and improves the display effect and performance of the display at the same time. 3. The combination of the FIP narrow border technology and the FDC under-screen camera technology is another important innovation point. By reasonably arranging the position and routing of the FIP driving leads in the pixel circuit of the camera area, avoiding interference with the camera signals, and optimizing the signal processing algorithm of the FDC technology to adapt to the pixel circuit changes brought by the FIP technology, the perfect combination of the under-screen camera function without holes and the extremely narrow border design is achieved. This collaborative development not only enhances the functionality and user experience of the product but also provides a new direction for the development of full-screen display technology.

[0014] 4. In terms of layout design, the FIP technology makes full use of the extra pixel circuit columns after pixel compression in the FDC to route the FIP jumper wires, avoiding the additional addition of signal jumper wires, reducing the design complexity and manufacturing cost. At the same time, the manufacturing process is optimized to adapt to the high integration and complexity of the pixel circuit, ensuring that the design scheme can be successfully realized in actual production and improving the manufacturability and reliability of the product. This innovation point improves the production efficiency and market competitiveness of the product. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of pixel compression in the full-screen flexible AMOLED display technology; Figure 2 It is a structural diagram after optimized design; Figure 3 It is a schematic diagram of wire routing. Detailed Embodiment

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] A flexible full-screen design method based on the FIP narrow border technology includes: Develop the FIP (Fanout in Pixel) narrow bezel design. This new Fanout in Pixel technology integrates the driving leads inside the pixel to reduce the bezel width and achieve a narrower bezel design. This design can effectively reduce the bezel width of the display screen, thereby increasing the screen-to-body ratio and achieving a more nearly full-screen effect.

[0018] Develop the FDC+FIP ultimate full-screen technology combination. This combines the FIP narrow bezel technology with the FDC (Full Display with Camera) under-screen camera technology to develop an ultimate full-screen technology that can achieve the function of under-screen camera without holes while further increasing the screen-to-body ratio of the display. This combined technology aims to achieve a truly full-screen effect and meet the market and customers' demands for a higher screen-to-body ratio and better display effect.

[0019] During the development of the FDC+FIP technology combination, it is necessary to consider how to cleverly use the extra pixel circuit columns after pixel compression in FDC to act as FIP jumper wires, so as to optimize the design layout and reduce the process manufacturing cost. This involves optimizing the pixel circuit design and layout, as well as improving the manufacturing process to ensure the feasibility and economy of the technical solution.

[0020] The technical solution is specifically as follows: First, it is necessary to redesign the pixel structure. In traditional display screen designs, the driving leads are usually located outside the pixel, occupying a relatively large bezel area. To implement the FIP narrow bezel technology, these driving leads must be transferred inside the pixel. This involves re-layout and optimization of the pixel circuit. Specifically, a part of the space needs to be divided inside each pixel unit for the arrangement of the driving leads. This requires fine adjustment of the size and shape of the pixel circuit to ensure that the driving leads can be accommodated within the limited space without affecting the normal display function of the pixel. Space can be made for the driving leads by shrinking some parts of the pixel circuit or adopting a more compact circuit design.

[0021] Second, it is necessary to ensure stable and reliable signal transmission of the driving leads inside the pixel. Since the driving leads are integrated inside the pixel, the signal transmission path will change and may be interfered by other parts of the pixel circuit. Therefore, appropriate signal shielding and isolation technologies need to be adopted to ensure that the driving signal is not interfered during transmission and maintain the integrity and stability of the signal. A shielding layer can be set around the driving leads, or a differential signal transmission method can be adopted to reduce interference. At the same time, it is also necessary to optimize the material and manufacturing process of the driving leads to improve their conductivity and durability and ensure the reliability of signal transmission during long-term use.

[0022] Next, the collaborative work of the FDC+FIP technology combination needs to be achieved. The FDC under-screen camera technology requires special pixel circuit design and signal processing in the camera area of the display screen to enable the normal operation of the camera. When combining the FIP narrow bezel technology with the FDC technology, it is necessary to ensure the compatibility and coordination between the two in pixel circuit design and signal processing. The position and routing of the FIP drive leads can be reasonably arranged in the pixel circuit of the camera area to avoid interference with the camera signal. At the same time, the signal processing algorithm of the FDC technology also needs to be optimized to adapt to the pixel circuit changes brought by the FIP technology and ensure the imaging quality and display effect of the camera.

[0023] In terms of the design layout implementation, the extra pixel circuit columns after FDC pixel compression should be fully utilized to route the FIP jumper wires. Specifically, in the layout design stage, the layout of the pixel circuit needs to be carefully planned, and the jumper wires of the FIP drive leads should be arranged in the extra pixel circuit columns after FDC pixel compression. This requires precise calculation and optimization of the pixel circuit layout to ensure that the arrangement of the jumper wires does not affect the normal function and signal transmission of the pixel circuit. At the same time, the feasibility of the manufacturing process also needs to be considered to ensure that the design scheme can be successfully implemented in actual production, reducing the manufacturing cost and improving the production efficiency.

[0024] As Figure 1 shown, the space of the original 7 pixels is compressed to accommodate 1 camera pixel, and so on. Compared with 7-to-1 compression, this design can provide a higher pixel density while maintaining the camera function, improving the display effect. The 2-to-1 design provides the highest pixel density and hardly affects the display effect in the camera area, enabling the under-screen camera technology to be realized on full-screen mobile phones while maintaining a high resolution.

[0025] As Figure 2 shown, by redesigning the pixel routing, the pixel circuit layout in the FDC area is optimized. It is worth mentioning that after the optimized design, the length difference of the pixel routing is reduced, which helps to improve the uniformity of the screen and reduce the display unevenness caused by the length difference of the routing. The pixel layout in the FDC area and the normal area is also more reasonable, which helps to improve the display effect in the camera area and the display quality of the entire screen.

[0026] Figure 3In it, the black lines represent the pixel array of the AMOLED screen. Each pixel is composed of three sub-pixels: red (R), green (G), and blue (B), which are the basic units that make up the AMOLED display screen. The colored lines (red, blue, and green) represent the circuit traces that control each pixel. These traces are responsible for transmitting signals and power to control the switching and brightness of the pixels. The densely colored line area on the left side of the figure may represent the FDC area, that is, the area where the under-screen camera is located. Inside this area, the pixel circuit is specially designed so that the camera can capture images through the screen. The yellow and pink lines at the bottom of the picture may represent the traces connecting the pixel circuit to other parts of the screen (such as the driving IC). These traces are crucial for the normal operation of the screen, and they are responsible for transmitting signals from the control circuit of the screen to each pixel.

[0027] Comparison experiment data: First, complete the preparation process of the OLED, including cleaning and treating the substrate, depositing a transparent conductive layer on the substrate, and successively depositing an organic light-emitting layer, an electron transport layer, and a hole transport layer by methods such as evaporation or spin coating, etc., evaporating a metal cathode, and completing the encapsulation of the device. The entire process needs to be carried out in a high-vacuum or inert gas environment to prevent the organic materials from being oxidized or contaminated. Prepare the OLED display array according to this method. Subsequently, through the FIP technology, integrate the driving leads of a part of the array inside each pixel to achieve a higher screen-to-body ratio, thereby realizing a set of comparative experiments.

[0028] Table 1 - Main performance indicators of the OLED array prepared without using the FIP technology

[0029] It is not difficult to find from the above table that as the bezel distance increases, the corresponding pixel density will decrease, and the brightness will also decrease, but the lifespan and storage time will increase accordingly. This is mainly because the traditional driving leads increase the distance between each pixel and prevent the crosstalk problem between each pixel, achieving the above effects. As the bezel distance decreases, the pixel density will increase accordingly. However, due to the physical dimensions of each component and problems such as crosstalk, it is impossible to achieve a small-bezel and high-performance OLED display device, and its optimal performance appears at a bezel distance of 1.0 / 1.0 / 1.0 / 1.5.

[0030] Table 2 - Main performance indicators of the OLED array prepared using the FIP technology and the signal shielding technology

[0031] As can be seen from the above table, the devices prepared using the FIP technology and the signal shielding technology have achieved good breakthroughs in terms of high performance with small border distances. Among them, the optimal performance appears at the border pitch of 1.0 / 1.0 / 1.0 / 1.0. Although there is some performance degradation for smaller borders, the devices here have already achieved a very high screen-to-body ratio and can meet the users' needs for high-quality screens.

[0032] The present invention has been described by the above embodiments. However, it should be understood that the above embodiments are only for the purpose of exemplification and illustration, and are not intended to limit the present invention within the scope of the described embodiments. In addition, those skilled in the art can understand that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope claimed by the present invention. The protection scope of the present invention is defined by the appended claims and their equivalent scope.

Claims

1. A flexible full-screen design method based on FIP narrow bezel technology, characterized in that, Including: S1: Divide a part of the space inside each pixel unit of the display screen for the layout of driving leads; S2: Adopt signal shielding and isolation technologies to ensure that the driving signals of the driving leads are not interfered during transmission; S3: The collaborative work of the FDC+FIP technology combination; conduct pixel circuit design and signal processing of the FDC under-screen camera in the camera area of the display screen to achieve the normal operation of the camera, combine the FIP narrow bezel technology with the FDC technology, arrange the position and direction of the driving leads of the FIP in the pixel circuit of the camera area to avoid interference with the camera signals; S4: In the layout design stage, plan the layout of the pixel circuit, and arrange the patch cord of the FIP driving lead in the pixel circuit column that is extra after the FDC pixel is compressed.

2. The flexible full-screen design method based on the FIP narrow border technology according to claim 1, characterized in that, Specifically in S1: Create space for the driving leads by shrinking part of the circuit of the pixel unit or adopting a compact circuit design.

3. A flexible full-screen design method based on the FIP narrow bezel technology according to claim 1, characterized in that, Specifically in S2: Set a shielding layer around the driving leads, or adopt a differential signal transmission method to reduce interference.

4. A flexible full-screen design method based on the FIP narrow bezel technology according to claim 1, characterized in that, S2 also includes optimizing the material and manufacturing process of the driving leads to improve the conductivity and durability of the driving leads.

5. A flexible full-screen design method based on the FIP narrow bezel technology according to claim 1, characterized in that In S3, optimize the signal processing algorithm of the FDC technology to adapt to the pixel circuit changes brought by the FIP technology.

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