Flexible Display Substrate Curved Portion Bezel Reduction
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Solution Overview
Problem
Flexible display devices face limitations due to the presence of a flexible film, which increases the bezel region, restricts flexibility, and can lead to contact errors between the substrate and the film, affecting signal transmission and user convenience.
Innovation Solution
A flexible display device design without a flexible film, featuring a substrate with a flat and curved portion, an encapsulation layer, and anisotropic conductive film (ACF) for connecting pads and terminals, allowing for improved flexibility and reduced bezel region, with driving ICs and leads distributed over a larger area to enhance state change freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible film is used in the flexible display device, then the device can achieve flexibility, but the bezel region increases and contact errors may occur between the substrate and the film
Solution Approach 1:
The patent removes the flexible film from the display device structure entirely. The substrate itself is designed with a curved portion that provides the necessary flexibility without requiring an additional flexible film layer, thereby eliminating the bezel region issues and contact errors associated with film-substrate interfaces.
Solution Approach 2:
Instead of adding a flexible film to achieve flexibility, the patent inverts the approach by making the substrate itself flexible through its curved portion design. This eliminates the need for the flexible film and resolves the associated problems while maintaining the flexibility function.
2Adaptability or versatility
If a flexible film is used in the flexible display device, then the device can achieve flexibility, but signal transmission may be affected due to contact errors
Solution Approach 1:
By removing the flexible film entirely and using the substrate's curved portion to provide flexibility, the patent eliminates the interface between the film and substrate that causes contact errors. This ensures reliable signal transmission while maintaining flexibility.
3Adaptability or versatility
If driving ICs and leads are distributed over a larger area, then flexibility and state change freedom are enhanced, but the device complexity increases
Solution Approach 1:
The patent segments the substrate into a flat portion for the pixel array and a curved portion for the pad portion. This segmentation allows the pad portion to be distributed over a larger area on the curved surface, enhancing flexibility and state change freedom while organizing the structure to manage complexity.
4Reliability
If the pad portion is bent to align with the terminal portion, then connection is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The substrate is pre-formed with a curved portion during manufacturing, with the pad portion positioned on the curved surface and the flat portion extending to the terminal portion. This preliminary shaping ensures that when the device is assembled, the pad portion naturally aligns with the terminal portion, reducing the need for high-precision alignment operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design reduces the bezel region, enhances user convenience, and improves the aesthetic appearance by allowing greater flexibility and minimizing signal interference, enabling wider application of flexible display devices.
Implementation Method 1
bonding the pad portion and the terminal portion with an anisotropic conductive film (ACF) layer therebetween
Data Source
AI summary
A flexible display device comprises a substrate having a flat portion and a curved portion, wherein a pixel array is provided in the flat portion and a pad portion connected to the pixel array is provided in the curved portion; and an encapsulation layer provided on the substrate to cover the pixel array, wherein the encapsulation layer comprises a terminal portion; an Integrated Circuit (IC) portion having at least one driving IC; and a lead portion having leads which connect the terminal portion and the driving IC portion, and wherein the curved portion of the substrate is bent so that the pad portion and the terminal portion are in contact with each other.