Flexible Display Device with Segmented Circuit Board on Flat Reel Surface
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Solution Overview
Problem
Flexible display devices face challenges in ensuring the reliability of electronic elements when the size of the rolled device is minimized, due to the constraints of flexible printed circuit boards.
Innovation Solution
A flexible display device design that includes a flexible display panel, a flexible printed circuit board, and a reel with a cavity structure, where the element area of the circuit board is placed on a planar surface of the reel, allowing the display panel to roll along the outer surface while maintaining the reliability of electronic elements and optimizing space for other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flexible printed circuit board is used to bind the display panel to reduce the rolled device size, then the device compactness is improved, but the reliability of electronic elements deteriorates due to bending stress
Solution Approach 1:
The patent divides the flexible printed circuit board into two distinct areas: a first binding area that contacts the reel surface during rolling, and an element area that contains electronic elements. This segmentation allows the binding area to bear the bending stress while the element area remains protected and flat, resolving the contradiction between compactness and element reliability.
Solution Approach 2:
The patent applies different functional qualities to different regions of the flexible printed circuit board. The first binding area is designed to be flexible and conform to the reel surface, while the element area is positioned to remain flat and stress-free. This local differentiation allows the board to achieve both compact rolling and element protection simultaneously.
2Area of moving object
If the flexible printed circuit board is used to achieve narrow frames, then the display area ratio is improved, but the reliability of electronic elements deteriorates when rolled to small size
Solution Approach 1:
The flexible printed circuit board is segmented into a first binding area for structural support and binding functions, and an element area for housing electronic elements. This segmentation enables the binding area to handle rolling stresses while the element area remains protected, allowing narrow frame design with high display area ratio without compromising element reliability.
3Volume of moving object
If the element area is placed on a curved surface during rolling, then the space utilization is improved, but the reliability of electronic elements deteriorates due to bending stress
Solution Approach 1:
The patent segments the flexible printed circuit board into a first binding area that contacts the curved reel surface and an element area that remains on a flat portion. This segmentation allows the binding area to utilize the curved space for compact rolling while the element area maintains its flat position, ensuring both space utilization and element reliability.
Solution Approach 2:
Different spatial qualities are assigned to different areas: the first binding area is positioned on the curved surface to achieve compact rolling, while the element area is positioned on the flat surface to maintain element reliability. This local spatial differentiation resolves the contradiction between space utilization and element protection.
Data Source
AI summary
The present disclosure provides a flexible display device including a flexible display panel, a flexible printed circuit board, and a reel. The flexible printed circuit board includes a first binding area provided with a first pad and an element area provided with an integrated circuit. The flexible display panel includes a display area, and a second binding area provided with a second pad. The first pad is bound to the second pad. The reel has a cavity, and the reel includes an inner surface facing towards the cavity and an outer surface facing away from the cavity. The inner surface includes a first surface, and the first surface is flat. The element area of the flexible printed circuit board is provided on the first surface, and the display area of the flexible display panel is rollable along the outer surface of the reel.