Flexible Substrate L-Shaped Groove for Electronic Paper Frame Width Reduction
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Solution Overview
Problem
The width of the edge with the chip of the flexible substrate in electronic paper display devices is limited by the size and position of silver glue dots used for electrical connections, which restricts the bending capability and circuit design.
Innovation Solution
An L-shaped groove is incorporated into the flexible substrate, allowing the bending area to extend to the bottom surface of the frame while bypassing the conductive glue, thereby reducing the frame width and enabling the flexible substrate to be bent without affecting the circuit design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If COP technology is used to connect chip to flexible substrate, then the width of the edge with chip can be reduced, but the silver glue dots cannot be bent which limits further reduction of edge width
Solution Approach 1:
The flexible substrate is divided into distinct functional areas: a first area for the display, a second area for the chip, and a bending area connecting them. The L-shaped groove further segments the substrate to create a dedicated conductive glue disposing area, separating the bending path from the conductive glue location. This segmentation allows the bending area to flex while keeping the conductive glue stationary on the first area, resolving the contradiction between reducing edge width and maintaining electrical connection reliability.
Solution Approach 2:
The L-shaped groove acts as an intermediary structure that guides the bending path of the flexible substrate. By introducing this intermediate geometric feature, the substrate can bend through the groove while the conductive glue remains protected on the first area. The groove mediates between the bending requirement and the conductive glue positioning constraint, enabling edge width reduction without compromising electrical connection reliability.
2Adaptability or versatility
If the flexible substrate is bent to reduce frame width, then the device flexibility is improved, but the conductive glue may be damaged or mispositioned
Solution Approach 1:
The L-shaped groove is pre-formed on the flexible substrate before the conductive glue is applied. This preliminary action creates a predetermined bending path that guides the substrate during flexing. By preparing the groove structure in advance, the bending operation can be performed without risking damage to the conductive glue, as the groove already defines the safe bending trajectory that keeps the glue on the rigid first area while allowing the second area to flex.
Solution Approach 2:
The L-shaped groove serves as an intermediary structure that protects the conductive glue during bending operations. The groove geometry (with horizontal and vertical portions) creates a mechanical guide that separates the bending stress from the conductive glue location. This intermediary structure allows the substrate to achieve flexibility for frame width reduction while the groove mediates the stress distribution to prevent glue damage or mispositioning.
Data Source
AI summary
An electronic paper display device includes a frame, a flexible substrate, a front panel, and a chip. The flexible substrate includes a first area, a second area, a bending area adjoining the first area and the second area, and a conductive glue disposing area. The first area and the conductive glue disposing area are located on the top surface of the frame. The flexible substrate has an L-shaped groove. When the bending area is bent through the L-shaped groove, the second area extends to the bottom surface of the frame. The front panel is located on the first area of the flexible substrate and has a conductive glue located in a non-display area. The conductive glue is located on the conductive glue disposing area of the flexible substrate. The chip is connected to the second area of the flexible substrate.