Shield Electrode Cation Leakage Wearable Display
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Solution Overview
Problem
Wearable display devices face issues with display quality due to cation leakage from the sealant, leading to local potential anomalies and display errors, as these cations are affected by the electric field and migrate to the display area.
Innovation Solution
Incorporating a shield electrode connected to a positive fixed potential in the peripheral area that creates a repulsive electric field, preventing cation migration and overlapping with peripheral circuits to protect them from electro-static discharge, while ensuring it does not overlap with the common electrode to avoid affecting the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shield electrode is added to suppress cation migration and protect peripheral circuits, then display quality and circuit protection are improved, but device complexity increases
Solution Approach 1:
A shield electrode is introduced as an intermediary component between the peripheral circuits and the display area. This electrode creates a repulsive electric field that acts as a barrier to prevent cation migration from the sealant into the display area, thereby protecting display quality without requiring fundamental changes to the sealant material or peripheral circuit design.
Solution Approach 2:
The shield electrode is positioned and biased to create a repulsive electric field before cations can migrate from the sealant. By establishing this protective electric field in advance, the system prevents the harmful migration process rather than attempting to correct it after occurrence, thereby maintaining display quality proactively.
2Reliability
If the shield electrode overlaps the peripheral circuits to protect them from electro-static discharge, then circuit protection is improved, but the risk of affecting the display area increases
Solution Approach 1:
The shield electrode is designed with spatially varying functionality: in the peripheral area, it overlaps with peripheral circuits to provide electro-static discharge protection, while in the display area, it is positioned to create a repulsive electric field against cations without overlapping the common electrode. This local differentiation allows the same component to serve multiple protective functions without causing harmful interference.
Solution Approach 2:
The shield electrode utilizes the vertical dimension (thickness direction) to achieve its protective function. By being disposed in the peripheral area and extending in the thickness direction, it can overlap peripheral circuits in plan view for ESD protection while maintaining sufficient spacing from the common electrode to avoid display interference, effectively using spatial arrangement to resolve the contradiction.
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 effectively suppresses display errors caused by cation leakage and protects peripheral circuits from electro-static discharge, maintaining better display quality compared to conventional designs.
Implementation Method 1
a shield electrode disposed in a peripheral area surrounding the display area and connected to a feeding line providing a positive fixed potential. The shield electrode creates a repulsive electric field that prevents cation migration
Implementation Method 2
overlapping with peripheral circuits to protect them from electro-static discharge
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate opposing the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate and a sealant which seals the liquid crystal layer. The first substrate includes a pixel electrode disposed in a display area, a peripheral circuit disposed in a peripheral area surrounding the display area and a shield electrode disposed in a position overlapping the peripheral circuit in plan view. The second substrate includes a common electrode disposed in the display area and opposing the pixel electrode. The shield electrode and the common electrode do not overlap each other in plan view.