Stretchable Display Device With Patterned Base And Protective Layer
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Solution Overview
Problem
Existing display devices face limitations in being both portable and reliable due to their rigidity and fragility, and they struggle to maintain high transmittance while being flexible and durable.
Innovation Solution
A stretchable display device is designed with a substrate featuring a base pattern with connected portions, a light emitting structure between electrodes, and a protective layer that covers the electrodes and light emitting structure, reducing surface area exposure and enhancing durability and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a display device uses a glass substrate, then it has high strength and rigidity, but it is heavy and easily broken
Solution Approach 1:
The patent replaces the traditional glass substrate with a flexible plastic substrate that can be made thin and lightweight. The substrate includes a base pattern with connection portions that provide structural support while maintaining flexibility and reducing weight, effectively substituting the heavy glass with a lightweight flexible alternative that retains necessary strength through patterned design.
2Weight of moving object
If the substrate is made flexible and thin, then it is lightweight and resistant to impact, but it reduces structural strength and reliability
Solution Approach 1:
The substrate is divided into multiple functional regions including a base pattern with first and second portions connected by connection portions. This segmentation allows different areas to serve different purposes: the base pattern provides structural support and reliability, while the spaces between patterns reduce overall material usage and weight, achieving both lightweight construction and structural reliability.
Solution Approach 2:
The patent employs a composite structure combining the flexible plastic substrate with additional functional layers including electrodes, light-emitting structures, and protective layers. This composite approach enhances the mechanical strength and reliability of the flexible substrate through the combined properties of multiple materials working together.
3Adaptability or versatility
If the display device is made portable and flexible, then it can be attached to various surfaces, but it becomes more fragile and less reliable
Solution Approach 1:
The flexible plastic substrate with patterned base structure enables the display device to conform to various curved and irregular surfaces while maintaining structural integrity. The base pattern's connection portions provide reinforcement that prevents cracking and failure during bending and stretching, ensuring reliability while achieving versatility in attachment applications.
4Reliability
If the protective layer covers more surfaces of the electrode and light emitting structure, then it improves reliability and durability, but it reduces light transmittance
Solution Approach 1:
The protective layer is strategically positioned to cover only specific surfaces of the upper electrode and light-emitting structure - specifically the side surfaces and top surfaces that are most vulnerable to damage - while leaving the light-emitting surfaces exposed or minimally covered. This localized protection approach maximizes durability where needed while preserving light transmittance where it matters most for display performance.
Data Source
AI summary
Provided is a stretchable display device. The stretchable display device includes a substrate and a base pattern on the substrate, wherein the base pattern comprises a first portion, a second portion, and a connection portion configured to connect the first portion to the second portion. The stretchable display device includes a lower electrode on the first portion of the base pattern; an upper electrode on the lower electrode, a light emitting structure between the lower electrode and the upper electrode, and a protective layer configured to cover top and side surfaces of the upper electrode, side surfaces of the light emitting structure, a side surface of the lower electrode, and a portion of a side surface of the base pattern. The upper electrode extends to a top surface of the connection portion and a top surface of the second portion of the base pattern, and the first portion and the second portion of the base pattern extend in a first direction parallel to a top surface of the substrate. The first portion and the second portion are parallel to the top surface of the substrate and are spaced apart from each other in a second direction crossing the first direction. The connection portion extends in the second direction. A level of the lowermost surface of the protective layer is disposed between a bottom surface of the lower electrode and a bottom surface of the base pattern.