Stretchable Display Panel Layout With Differential Elongation Zones
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Solution Overview
Problem
Existing display devices, particularly flexible and stretchable ones, face challenges in maintaining image quality and structural integrity when subjected to various forms of deformation and stress, such as folding, rolling, and stretching.
Innovation Solution
A stretchable display device is designed with a display panel comprising a first film, where the display panel includes a display portion, a driver portion, and a frame portion, each with distinct elongation rates and island structures that allow for differential stretching capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display device is designed to be stretchable and deformable, then adaptability and versatility are improved, but structural integrity and image quality deteriorate under deformation stress
Solution Approach 1:
The display panel is divided into multiple island portions (display islands, driver islands, frame islands) that are spatially separated and independently structured. These islands are connected through bridge portions that can deform independently, allowing the overall structure to stretch while maintaining integrity of individual functional regions.
Solution Approach 2:
Different regions of the display panel are assigned different elongation rates through the island-bridge structure. The frame portion has a higher elongation rate than the display and driver portions, allowing localized deformation distribution that protects critical areas while enabling overall stretchability.
2Ease of operation
If the display panel is made uniformly stretchable, then ease of operation is improved, but image quality and manufacturing precision worsen due to stress concentration
Solution Approach 1:
The patent implements non-uniform elongation rates across different portions of the display panel. The frame portion is designed with a higher elongation rate than the display and driver portions, creating localized deformation zones that protect the image quality areas from excessive stress while still allowing overall panel deformation.
Solution Approach 2:
By segmenting the panel into isolated islands connected by flexible bridges, the structure allows controlled local deformation in the bridge regions while keeping the island regions (containing pixels and circuits) relatively stable, thus maintaining image quality during operation.
3Reliability
If different portions of the display panel have different elongation rates, then reliability is improved by reducing stress concentration, but device complexity increases
Solution Approach 1:
The display panel is segmented into multiple island portions (display islands, driver islands, frame islands) connected by bridge portions. This segmentation naturally creates different elongation zones without requiring complex additional mechanisms, as the bridge portions inherently deform more than the rigid island portions during stretching.
Solution Approach 2:
Different elongation rates are achieved through local structural design rather than global control mechanisms. The frame islands are designed with geometric features (such as sawtooth patterns) that inherently provide higher elongation capacity, creating local deformation zones without adding overall system complexity.
Data Source
AI summary
A display device includes a first film, and a display panel disposed on the first film and including a display portion, a driver portion, and a frame portion, which are sequentially arranged in a first direction, wherein the display portion includes a plurality of first island portions spaced apart from each other and including light-emitting elements, the driver portion includes a plurality of second island portions spaced apart from each other and on which drivers that provide electrical signals to the light-emitting elements are arranged, the frame portion includes a plurality of third island portions spaced apart from each other in a second direction crossing the first direction, and an elongation rate of the display portion, an elongation rate of the driver portion, and an elongation rate of the frame portion are different from each other.