Rollable Display Device Using Transparent Conducting Oxide Substrate
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Solution Overview
Problem
Conventional rollable display devices face issues with flexibility, operation defects, and crack propagation due to stress during rolling and unwinding, particularly when using plastic substrates, which can lead to static electricity, display quality degradation, and increased thickness.
Innovation Solution
A rollable display device utilizing a transparent conducting oxide or oxide semiconductor layer as the substrate, with an inorganic insulating layer positioned inward from the sealing substrate to minimize stress and crack propagation, and an organic insulating layer to fill disconnected regions, reducing the likelihood of cracks and operation defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a plastic substrate is used to achieve flexibility and thinness, then the display device can be rolled up, but static electricity occurs and display quality degrades
Solution Approach 1:
The patent changes the material parameter from plastic substrate to transparent conducting oxide or oxide semiconductor substrate, which eliminates static electricity generation while maintaining flexibility and thinness required for rollable display functionality
Solution Approach 2:
The patent uses a thin-film structure with disconnected inorganic insulating layers that can be replaced or reset, preventing crack propagation and extending device life while maintaining display quality
2Area of stationary object
If the inorganic insulating layer extends to the edge of the sealing substrate, then coverage is maximized, but cracks occur and propagate during rolling
Solution Approach 1:
The inorganic insulating layer is divided into multiple disconnected regions rather than forming a continuous edge-to-edge layer, which prevents crack propagation while maintaining sufficient coverage for electrical insulation and structural support
Solution Approach 2:
The organic insulating layer is positioned to overlap the disconnected inorganic insulating layer edges, creating a cushioning effect that prevents cracks from propagating outward during rolling and unwinding operations
3Strength
If the back cover is made rigid to support the display panel, then structural stability is improved, but the back cover expands during rolling causing operation defects
Solution Approach 1:
The back cover is designed with flexibility to accommodate rolling operations, using thin-film construction that can bend and deform during winding/unwinding while maintaining sufficient structural support for the display panel
Solution Approach 2:
The back cover transitions from a static rigid structure to a dynamic flexible structure that can adapt its shape during rolling operations, expanding and contracting as needed while maintaining operational reliability
Data Source
AI summary
A display device can include a lower substrate made of a transparent conducting oxide or an oxide semiconductor, a first inorganic insulating layer disposed on the lower substrate, a planarization layer disposed on the first inorganic insulating layer, a light-emitting element disposed on the planarization layer, and a sealing substrate disposed on the first inorganic insulating layer, the planarization layer, and the light-emitting element. The display device can further include a back cover disposed on the sealing substrate and having a plurality of opening portions, and a roller part configured to wind or unwind the back cover. An end of the first inorganic insulating layer can be disposed inward from an end of the sealing substrate.