Foldable Display Pixel Structure with Organic Insulating Layer
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Solution Overview
Problem
Existing foldable display panels with 7-transistors-1-capacitor (7T1C) circuit structures face issues with the inorganic insulating layer breaking when bent, and difficulty in integrating an organic layer into the narrow bending area without impacting circuit performance.
Innovation Solution
A pixel structure is designed with a 7T1C circuit on a substrate, featuring first and second thin-film transistors with annular holes penetrating the inorganic insulating layer to accommodate an organic layer, reducing stress through a new pixel layout that fills the inorganic insulating layer around the transistors with organic material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic insulating layer is used in the 7T1C circuit structure, then the insulating performance is improved, but the layer breaks when the panel is bent
Solution Approach 1:
The patent changes the material parameter from inorganic insulating layer to organic insulating layer. The organic layer has different mechanical properties that allow it to withstand bending without breaking, while still providing the necessary insulating function for the 7T1C circuit structure.
Solution Approach 2:
The patent uses a composite structure where the organic layer is combined with the inorganic layer in specific regions. This composite approach allows the organic material to provide flexibility in bending areas while the inorganic material maintains insulating performance in circuit areas, resolving the contradiction between insulation and flexibility.
2Adaptability or versatility
If a large area is allocated for the bending area, then the flexibility is improved, but the pixel layout density decreases
Solution Approach 1:
The patent applies different material properties to different locations: the organic layer is specifically placed in the bending area to provide flexibility, while the inorganic layer is used in the pixel circuit areas to maintain performance. This local differentiation allows the panel to bend without sacrificing pixel layout density.
Solution Approach 2:
The insulating layer is segmented into different material regions - organic material in the bending zone and inorganic material in the circuit zone. This segmentation allows each region to have optimized properties for its specific function, enabling both flexibility and high pixel density.
3Adaptability or versatility
If the organic layer is introduced into the 7T1C circuit structure, then the flexibility is improved, but it is difficult to integrate into the narrow area
Solution Approach 1:
The organic layer is selectively introduced only in the bending area rather than throughout the entire pixel structure. This localized approach maintains flexibility benefits while avoiding interference with the narrow circuit layout, reducing integration complexity.
Data Source
AI summary
The present invention provides a pixel structure and a foldable display panel, wherein the pixel structure is applied to a 7-transistors-1-capacitor (7T1C) drive circuit structure, wherein through a new pixel layout, the inorganic insulating layer around the first thin film transistor and the second thin film transistor are all dug out and filled with an organic material, and the organic material further covers the third metal layer, such that the stress can be reduced when the panel is folded.