Optimization design method for FDC product of flexible AMOLED

Abstract

The invention discloses an FDC product optimization design method for a flexible AMOLED, and relates to the technical field of flexible display, and the method comprises the steps: firstly, selecting an FDC pixel circuit limit compression design; then, selecting a limit process challenge; carrying out design optimization on the basis of an existing R / G / B one-drive one-FDC product, and selecting a new pixel drive design; then, carrying out optimization design on the ITO lead layout; finally, an FIP (Fanout in Pixel) narrow frame design is adopted, and an FDC (Fanout in Pixel) under-screen camera is combined; the FDC pixel circuit limit compression design, the limit process challenge, the new pixel driving design, the new ITO lead layout and the FIP narrow frame design are selected, the number of pixels contained in a product is increased, the number of ITO driving leads is reduced, the ITO wiring length is shortened, the middle black line problem is solved, the ratio of the longest ITO to the shortest ITO is reduced, the driving consistency of the light-emitting unit is improved, and the light-emitting efficiency is improved. Therefore, the FDC image quality is improved, the black line problem is improved, and the display screen proportion is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible display, and particularly to an optimization design method for FDC products of flexible AMOLED. Background Art

[0002] With the popularization of mobile Internet, people hope that the mobile phone screen has a larger screen-to-body ratio (the ratio of the display screen area to the front panel area of the mobile phone) to view more information. In the past two years, major mobile phone and panel manufacturers have been considering how to hide the camera under the complete display screen to achieve a true full-screen. The difficulty of the under-screen camera technology lies in how to balance the picture display and the photographing effect in the camera area. There are many signal traces and metal patterns in the traditional display screen, and when the camera hidden under the screen takes pictures, it needs to pass through various metal patterns in the screen, so both the light transmittance and the light diffraction are problems, and the photographing effect is poor. In April 2022, BOE launched a new under-screen camera technology named FDC (Full Display with Camera). Different from the existing one-drive-multiple-array technology on the market, FDC adopts the same one-drive-one technology as the conventional display area even in the camera area, which can ensure that there is no difference in display between the camera area and the conventional display area.

[0003] However, there are still several problems: First, the compressed design of the pixel circuit of FDC is not conducive to high pixel density (PPI) products; second, due to the wiring principle, there is a risk that the driving delay cannot turn on (i.e., the middle black line problem), which urgently needs to be improved to enhance the image quality; finally, there are many driving leads in the lower border, and it is difficult to achieve the same narrow border as the upper / left / right. Summary of the Invention

[0004] The purpose of the present invention is to propose an optimization design method for FDC products of flexible AMOLED to solve the above problems.

[0005] The present invention realizes the above purpose through the following technical solutions: An optimization design method for FDC products of flexible AMOLED of the present invention includes the following steps: S1. For the pixel circuit of the FDC product, a higher pixel compression degree is selected, that is, a 4-in-1 pixel compression degree under the premise of 430 PPI, so as to accommodate more pixels on the same physical area; S2. Select the challenging extreme process development (phase shift mask technology) to finely control the shape and size of the pixel pattern; S3. Select the G-one-drive-two and R / B-one-drive-one design in the FDC area, which reduces the number of ITO driving leads and shortens the ITO wiring length; S4. Perform jumper connection on the ITO lead layout to reduce the ratio of the longest ITO to the lowest ITO; S5. Combine with the FDC under-screen camera and integrate the FIP narrow-bottom border technology to further increase the screen display ratio.

[0006] The beneficial effects of the present invention are as follows: For the optimized design method of the FDC product of the flexible AMOLED of the present invention, first, the extreme compression design of the FDC pixel circuit is selected, enabling the FDC product to accommodate more pixels. Then, the extreme process challenge is selected to precisely control the shape and size of the pixel pattern, achieving the 430PPI FDC under-screen camera technology. Next, based on the existing R / G / B one-drive-one FDC product, design optimization is carried out. For the R and B light-emitting units in the FDC area, one pixel circuit drives one light-emitting unit, and for the G light-emitting unit, one pixel circuit drives two light-emitting units, reducing the number of ITO driving leads, shortening the ITO wiring length, and improving the problem of the middle black line. After that, jumper connections are made to the ITO lead layout, reducing the ratio of the longest to the shortest ITO, and improving the driving consistency of the light-emitting units. Finally, the FIP (Fanout in Pixel, in-pixel driving lead technology) narrow border design is adopted, combined with the FDC under-screen camera, to further increase the screen display ratio. It selects the extreme compression design of the FDC pixel circuit, the extreme process challenge, the new pixel driving design, the new ITO lead layout, and the FIP narrow border design, increasing the number of pixels that the product can accommodate, reducing the number of ITO driving leads, shortening the ITO wiring length, improving the problem of the middle black line, reducing the ratio of the longest to the shortest ITO, improving the driving consistency of the light-emitting units, thereby improving the FDC image quality, solving the black line problem, and increasing the screen display ratio. Description of the Drawings

[0007] Figure 1 It is the technical roadmap of the optimized design method of the FDC product of the flexible AMOLED of the present invention; Figure 2 It is the FDC schematic diagram of the optimized design method of the FDC product of the flexible AMOLED of the present invention; Figure 3 It is the schematic diagram of selecting the extreme compression design of the FDC pixel circuit in the optimized design method of the FDC product of the flexible AMOLED of the present invention; Figure 4 It is the schematic diagram of selecting the new pixel driving design in the optimized design method of the FDC product of the flexible AMOLED of the present invention; Figure 5 It is the comparison schematic diagram of selecting the new ITO lead layout and the existing design in the optimized design method of the FDC product of the flexible AMOLED of the present invention; Figure 6Schematic diagram of the FIP narrow bezel design selected for the optimized design method of the FDC product of a flexible AMOLED of the present invention. Detailed implementation manners

[0008] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention generally described and illustrated in the accompanying drawings herein can be arranged and designed in a variety of different configurations.

[0009] 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 claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0010] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0011] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of the present invention is in its usual placement, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0012] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be 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, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0013] The following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings.

[0014] As Figures 1-6 shown, an optimized design method for the FDC product of a flexible AMOLED includes the following steps: S1. For the pixel circuit of the FDC product, select a pixel compression degree of 4-in-1 under the premise of a higher pixel compression degree of 430 PPI, so as to accommodate more pixels on the same physical area; S2. Select the challenging extreme process development (phase shift mask technology) to finely control the shape and size of the pixel pattern; S3. Select the G-one-drive-two and R / B-one-drive-one design in the FDC area, which reduces the number of ITO driving leads and shortens the ITO routing length; S4. Connect the ITO leads in a jumper connection to reduce the ratio of the longest ITO to the shortest ITO; S5. Combine the FDC under-screen camera and integrate the FIP narrow bottom border technology to further increase the screen-to-body ratio.

[0015] In one embodiment, the higher pixel compression degree in step S1 is to achieve a pixel compression degree of 4-in-1 under the premise of 430 PPI, and the difficulty is similar to 2-in-1 of 400 PPI, as shown in Figure 3 shown.

[0016] In one embodiment, the challenging extreme process in step S2 is PSM (phase shift mask technology).

[0017] In one embodiment, the new pixel driving design in the FDC area of step S3 is as follows: For the R and B light-emitting units in the FDC area, one pixel circuit drives one light-emitting unit; For the G light-emitting unit in the FDC area, one pixel circuit drives two light-emitting units, as shown in Figure 4 shown.

[0018] In one embodiment, the optimized design of the ITO lead layout in step S4 is to skip several columns when connecting the ITO wires and then start normal wiring. The shortest ITO connection will become several times longer on the original basis, while the longest connection opportunity will not change. Therefore, only the shortest ITO length will be affected, and the longest ITO length will not be affected, as shown in Figure 5 shown.

[0019] In one embodiment, the FIP narrow bottom border technology in step S5 is as follows: Route the driving leads of the bottom border in the pixel area; Use the extra pixel circuit columns after FDC pixel compression to route the FIP transfer wires, as shown in Figure 6 shown.

[0020] In summary, in the present invention, a pixel compression degree of 4-in-1 is achieved on the premise of 430 PPI, and a challenging PSM (phase shift mask technology) is selected, which increases the number of pixels that the product can accommodate and upgrades the overall display image quality. Based on the original one-to-one driving of R / G / B in the FDC area, the design is optimized. For the R and B light-emitting units in the FDC area, one pixel circuit is used to drive one light-emitting unit, and for the G light-emitting unit, one pixel circuit is used to drive two light-emitting units, which can reduce the number of ITO driving leads, thereby shortening the ITO trace length corresponding to the OLED light-emitting units in the middle column of the FDC and improving the problem of the middle black line and enhancing the FDC image quality. An optimized ITO lead layout is selected. When connecting the ITO, several columns are skipped before normal connection starts. The shortest ITO connection will become several times longer than the original, while the longest connection opportunity remains unchanged. Therefore, the shortest ITO length can be doubled, and the longest ITO length remains almost unchanged, reducing the ratio of the longest to the shortest ITO, improving the driving uniformity of the OLED light-emitting units in the FDC area, improving the uniformity of the image quality, and improving the black line problem. An FIP narrow bezel design is selected, especially the development of the FDC+FIP extreme full-screen technology. While meeting the requirement of the holeless under-screen camera function, the FIP lower narrow bezel technology is integrated to further increase the screen-to-body ratio.

[0021] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A FDC product optimization design method for flexible AMOLED, characterized in that: The following steps are involved: S1. For the pixel circuit of FDC products, a higher pixel compression level of 430PPI is required, which is 4-to-1 pixel compression level. S2, select extreme process development to control the shape and size of pixel patterns; S3, select the FDC area G one drive two and R / B one drive one design to reduce the number of ITO drive leads and shorten the ITO routing length; S4. Perform jumper connection on the ITO lead layout to reduce the longest and lowest ratio of ITO; S5, combined with FDC under-screen camera and FIP under-screen narrow border technology.

2. The FDC product optimization design method of a flexible AMOLED according to claim 1, characterized in that: The higher pixel compression level required in S1 is to achieve a pixel compression level of 4 to 1 under the premise of 430PPI.

3. The FDC product optimization design method of a flexible AMOLED according to claim 2, characterized in that: The limiting process in S2 is PSM.

4. The FDC product optimization design method of a flexible AMOLED according to claim 1, characterized in that: The new pixel drive design in the FDC area of ​​S3 is: The R and B light-emitting units in the FDC area use one pixel circuit to drive one light-emitting unit; The G light-emitting unit in the FDC region uses one pixel circuit to drive two light-emitting units.

5. The FDC product optimization design method of flexible AMOLED according to claim 4, characterized in that: The optimized design of the ITO lead layout in S4 is to skip several columns when connecting the ITO wires and then start normal connection.

6. The FDC product optimization design method of flexible AMOLED according to claim 1, characterized in that: The narrow border technology under FIP in S5 is: Route the drive leads of the lower frame within the pixel area; The extra pixel circuit columns after FDC pixel compression are used to route the FIP adapter line.

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