Centro-Symmetric TFT Substrate for Flexible Display Stress Management
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Solution Overview
Problem
Conventional thin-film transistor substrates experience stress and strain asymmetry when bent, leading to inconsistent electrical properties and potential damage during bending, which affects the reliability of flexible display screens.
Innovation Solution
A thin-film transistor substrate manufacturing method that incorporates a centro-symmetric structure, including a gate electrode, gate insulation layer, active layer, source electrode, passivation layer, and drain electrode, all arranged in concentric centro-symmetric patterns on a backing, which helps distribute stress evenly across bending directions, preventing asymmetrical stress and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional thin-film transistor structure is used, then the manufacturing process is simple, but the electrical properties become inconsistent when bent in different directions due to asymmetric stress distribution
Solution Approach 1:
The patent applies asymmetry principle by designing a symmetric structure (centro-symmetric pattern) to counteract the asymmetric stress that occurs during bending. The gate electrode, active layer, source electrode, and drain electrode are arranged in a centro-symmetric pattern, which ensures that stress is distributed uniformly in all directions during bending, thereby maintaining consistent electrical properties regardless of bending direction.
2Reliability
If a conventional thin-film transistor structure is used, then the device complexity is low, but the transistor is easily damaged by stress during bending
Solution Approach 1:
The patent uses the asymmetry principle by implementing a symmetric layout (centro-symmetric pattern) that balances stress distribution during bending. This symmetric arrangement of the gate electrode, active layer, source electrode, and drain electrode prevents stress concentration at specific locations, thereby reducing damage risk during flexible bending operations.
3Strength
If the thin-film transistor substrate is made flexible, then the weight and impact resistance are improved, but stress and strain asymmetry occurs during bending
Solution Approach 1:
The patent addresses the stress distribution issue in flexible substrates by designing a centro-symmetric structure. The gate electrode, active layer, source electrode, and drain electrode are positioned in a symmetric pattern that ensures uniform stress and strain distribution during bending, preventing the asymmetry that would otherwise occur in flexible configurations.
Data Source
AI summary
A thin-film transistor substrate manufacturing method includes sequentially forming, on a backing, a gate electrode, a gate insulation layer, a source electrode and an active layer, a passivation layer, a drain electrode, and a pixel electrode. Orthogonal projections of the gate electrode, the gate insulation layer, the source electrode and the active layer, the passivation layer, the drain electrode, and the pixel electrode on the backing that are concentric centro-symmetric patterns. Also provided re a thin-film transistor substrate and a liquid crystal panel including the thin-film transistor substrate. The thin-film transistor substrate manufacturing method, the thin-film transistor substrate and the liquid crystal panel including the thin-film transistor substrate allow electrical property of a thin-film transistor consistent in all bending directions and make the thin-film transistor not easily subjected to stress damage during bending so as to improve the reliability of the thin-film transistor.