Stretchable Printed Circuit Film for Stress-Matched Display Interconnects
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Solution Overview
Problem
Conventional stretchable display devices face issues with stress concentration and damage to flexible printed circuit films due to the mismatch in extensibility between the display panel and the non-extensible printed circuit board, leading to reliability concerns when the display is stretched.
Innovation Solution
A flexible printed circuit film with a base film that is extensible and includes conductive lines, where the base film is separated into sub-base films corresponding to the conductive lines, and a stretchable display device with a connection film that matches the stretch rate of the display panel, minimizing stress and damage by distributing it across the film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-extensible printed circuit board is used to electrically connect the display panel, then the structural stability and electrical connection are improved, but stress concentration and damage occur when the display panel is stretched
Solution Approach 1:
The base film is divided into multiple sub-base films corresponding to individual conductive lines. This segmentation allows each sub-base film to independently stretch and deform, distributing the stress that would otherwise concentrate on a single rigid structure. The segmented design maintains electrical connection reliability while accommodating the stretching of the display panel.
Solution Approach 2:
The patent replaces the rigid printed circuit board with a flexible base film structure that can stretch and deform elastically. This thin film approach allows the circuit to conform to the stretched state of the display panel, eliminating stress concentration while maintaining electrical connectivity through the conductive lines formed on the flexible substrate.
2Strength
If an extensible base film is used for the flexible printed circuit, then the stress concentration is reduced when stretched, but the structural stability and manufacturing precision deteriorate
Solution Approach 1:
The patent applies different properties to different regions: the base film provides extensibility and stress distribution, while the conductive lines formed on the film maintain precise geometric patterns and electrical properties. The local quality principle allows the flexible substrate to stretch while the circuit patterns retain their manufacturing precision through appropriate material selection and formation processes.
3Strength
If the base film is separated into sub-base films corresponding to conductive lines, then the stress concentration is minimized, but the device complexity increases
Solution Approach 1:
The patent merges the functions of multiple separate support structures into a single integrated flexible base film system. Instead of requiring separate rigid supports for each conductive line, the segmented sub-base films work together as a unified flexible structure that distributes stress across the entire circuit area, simplifying the overall device architecture while maintaining stress resistance.
Data Source
AI summary
A stretchable display device comprises a display panel that includes a stretchable substrate where a plurality of emission elements is disposed, wherein the stretchable substrate is stretchable in at least one of a first direction and a second direction perpendicular to the first direction; a printed circuit film that includes a first driving circuit chip generating a drive control signal to be applied to the display panel and a second driving circuit chip receiving image data from outside and transferring the image data to the first driving circuit chip, wherein the printed circuit film is stretchable in at least one of the first direction and the second direction with respect to a stretch direction of the display panel.