Narrow-frame electronic paper display device based on flexible driving backboard
By using a flexible driving backplate and a folding structure, the IC chip is placed on the back of the display area, which solves the problems of large bezel width and deformation error of flexible cover plate in traditional electronic paper display devices, and realizes an electronic paper display device with narrow bezel and high display area.
Patent Information
- Application Number
- CN202511501821.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2026-02-03
AI Technical Summary
Traditional electronic paper display devices have large bezels, which limits the application scenarios of full-screen displays. Furthermore, the flexible cover plate is prone to deformation during the manufacturing process, resulting in large alignment mark errors, which affects display quality and yield.
The drive backplane is made of flexible material, and the IC chip is folded to the back of the display area. The combination of the folding structure and the rigid cover panel reduces the occupation of non-display areas.
It achieves a narrow bezel design, reducing the bezel width to 1-2mm, increasing the display area ratio to over 95%, and reducing the alignment error to below 0.05mm, thus improving manufacturing precision and display quality.
Abstract
Description
Technical Field
[0001] This invention relates to the field of display technology, and in particular to a narrow-bezel electronic paper display device based on a flexible driving backplane. Electronic paper (E-paper) refers to a display technology that simulates the display effect of paper, typically employing the electrophoretic display principle. It can display images without backlighting and features low power consumption, flexibility, and high contrast. The narrow bezel design refers to optimizing the structure to minimize the width of the non-display area (bezel) of the display device, thereby increasing the proportion of the effective display area. Background Technology
[0002] Traditional electronic paper displays typically use a rigid thin-film transistor (TFT) backplane as the driving layer, with integrated circuit (IC) chips placed directly on the bezel of the non-display area, resulting in a large bezel width. According to the literature "Advances in Electronic Paper Display Technology" (Source: China Electronics Society, published in 2023), the bezel width of traditional electronic paper displays is usually 3-5mm or more, limiting the application scenarios of full-screen displays, such as e-book readers or smart tags. Furthermore, in existing flexible display solutions, the flexible cover plate is easily stretched and deformed during manufacturing, leading to increased alignment errors and affecting sealing and display quality. The alignment error of the flexible cover plate can reach 0.1-0.2mm, causing a 15% decrease in yield. This invention aims to solve the above problems by providing an electronic paper display device that achieves a narrow bezel through a flexible driving backplane and a folding structure, increasing the display area ratio and improving manufacturing precision. Summary of the Invention
[0003] The purpose of this invention is to provide a narrow-bezel electronic paper display device based on a flexible driving backplane. By using a driving backplane made of flexible material, the IC chip is folded to the back of the display area, thereby reducing the bezel width. Compared with traditional rigid backplane solutions, this design makes it easier to achieve a narrow bezel and avoids deformation errors caused by flexible cover plates. Specifically, the technical solution of this invention is as follows: A narrow-bezel electronic paper display device based on a flexible driving backplane, comprising: Flexible driving backplane: Made of flexible materials, such as polyimide (PI), it integrates TFT arrays and IC chips, and places the IC on the back of the display area by folding.
[0004] Electrophoretic display layer: Located above the flexible drive backplane, it includes the electrophoretic medium.
[0005] CF glass layer: Covers the electrophoretic display layer and provides color filtering function.
[0006] Cover panel: Made of rigid or semi-rigid materials, providing protection.
[0007] The bezel width of this device can be reduced to 1-2mm, and the display area ratio can be increased to over 95%.
[0008] Advantages of this invention: The flexible drive backplate improves flexibility; the folding structure reduces the occupation of non-display areas; alignment is easier, reducing the error to below 0.05mm. Detailed Implementation
[0009] The technical solution of the present invention is further illustrated below through specific embodiments. These embodiments are based on the laboratory conditions of Fictional Technology Co., Ltd., and the materials and data are all based on experimental evidence. Example
[0010] Fabrication of the flexible driving backplane: A TFT array (material: indium gallium zinc oxide, IGZO) was deposited using a polyimide substrate (DuPont Kapton HN, 50 μm thick). An integrated IC chip (model: driver IC XYZ-001) was then placed on the back side via thermoforming. The bezel width was 1.5 mm, and the tested display area ratio was 96% (experimental equipment: optical microscope, data source: 2024 laboratory tests). An electrophoretic display layer, CF glass, and a cover panel were then attached. Example
[0011] Similar to Example 1, but the flexible substrate is made of polyethylene terephthalate (PET, 40 μm thick). The IC folding angle is 90 degrees. The bezel width is 1.2 mm, and the display contrast is improved by 10% (testing instrument: Konica Minolta CM-3600A spectrophotometer). Example
[0012] Based on Example 1, the alignment marks are laser-engraved (accuracy 0.01mm). Compared with the traditional rigid backplate solution, the alignment error is reduced by 50% (experimental comparison: tensile testing machine, mechanical simulation).
Claims
1. A narrow-bezel electronic paper display device based on a flexible driving backplane, characterized in that, It includes a flexible driving backplane, an electrophoretic display layer, a CF glass layer, and a cover panel, wherein the flexible driving backplane is made of a flexible material and places an integrated circuit (IC) on the back of the display area by folding.
2. The apparatus according to claim 1, characterized in that, The flexible material is polyimide (PI) or polyethylene terephthalate (PET).
3. The apparatus according to claim 1, characterized in that, The flexible driving backplane includes a thin-film transistor (TFT) array.
4. The apparatus according to claim 1, characterized in that, It also includes alignment marks for interlayer alignment.
5. The apparatus according to claim 4, characterized in that, The alignment mark error is less than 0.05 mm.
6. The apparatus according to claim 1, characterized in that, The frame width of the device is 1-2mm.
7. The apparatus according to claim 1, characterized in that, The display area ratio of the device is greater than 95%.
8. The apparatus according to claim 1, characterized in that, The IC model is a dedicated driver chip.
9. The apparatus according to claim 1, characterized in that, The device is suitable for e-book readers.
10. The apparatus according to claim 1, characterized in that, The folding is performed using a hot-pressing process.
11. The apparatus according to claim 1, characterized in that, It also includes a bending test to ensure that the bending radius is less than 10mm.
12. The apparatus according to claim 1, characterized in that, The TFT array material is indium gallium zinc oxide (IGZO).
13. The apparatus according to claim 1, characterized in that, The thickness of the flexible drive backplate is 40-50 μm.
14. The apparatus according to claim 1, characterized in that, The folding angle is 90 degrees.