Stretchable Display Device Segmented Common Electrode
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Solution Overview
Problem
Existing display devices that can change form, such as folding or rolling, struggle to maintain the integrity of their components like the common electrode and encapsulation when the substrate is stretched, leading to potential damage.
Innovation Solution
A stretchable display device is designed with a stretchable substrate and light emitting units that include a pixel electrode, an emission layer, a common electrode, and a common wiring electrode. The common electrode and encapsulation are separately formed for each light emitting unit to minimize damage during stretching and are made of materials with elasticity, such as conductive polymers or metal strips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the common electrode and encapsulation are formed as a single integrated structure, then the manufacturing process is simpler, but the integrity of components is compromised during stretching
Solution Approach 1:
The common electrode and encapsulation are divided into separate structures, with the common electrode formed first and the encapsulation formed later as distinct layers. This segmentation allows each component to be optimized independently for stretching durability while maintaining manufacturing feasibility through sequential processing steps.
2Strength
If the display device uses rigid materials for the common electrode and encapsulation, then the structural strength is higher, but the device cannot be stretched without damaging components
Solution Approach 1:
The common electrode and encapsulation are formed using flexible materials and thin film structures that can accommodate stretching. The encapsulation is designed as a thin protective layer that maintains strength while allowing the underlying stretchable substrate to deform, enabling the device to be stretched without component damage.
3Area of stationary object
If the light emitting units are placed close together to maximize display area, then the area utilization is higher, but the risk of component damage during stretching increases
Solution Approach 1:
The display is segmented into multiple independently formed light emitting units with separate common electrodes and encapsulations. This segmentation allows each unit to move and deform independently during stretching, reducing stress concentration and component damage risk while maintaining high area utilization through dense packing of the segmented units.
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
This configuration allows the stretchable display device to maintain functionality and minimize damage to the common electrode and encapsulation when the substrate is stretched, enabling flexible and reliable operation.
Implementation Method 1
a stretchable substrate, at least a portion of which is stretchable in at least one direction
Implementation Method 2
the light emitting units each including a pixel electrode, an emission layer, a common electrode
Data Source
AI summary
A stretchable display device includes a stretchable substrate, at least a portion of which is stretchable in at least one direction, a plurality of light emitting units formed on the stretchable substrate, the light emitting units being spaced apart from each other, the light emitting units each including a pixel electrode, an emission layer, a common electrode, and a common wiring electrode conducted to the common electrode, and a plurality of encapsulations covering and protecting the plurality of light emitting units, respectively.