Capacitor Electrode Segmentation for Bridge Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitor failure in display apparatuses due to short circuits caused by disconnection of bridges between electrodes, leading to dark spots and pixel failure, is a persistent issue in flat panel displays like OLEDs and LCDs.
Innovation Solution
A capacitor device design featuring first and second electrodes with separate regions connected by bridges, a dielectric film, and insulating films with specific openings to expose the bridges, allowing for controlled cutting of bridges to prevent damage from contaminants and maintain capacitor functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bridge is formed between separated electrode regions to maintain electrical connection, then the capacitor's electrical functionality is improved, but the bridge becomes vulnerable to disconnection from contaminants causing capacitor failure
Solution Approach 1:
The electrode is segmented into multiple separated regions (first region and second region) connected by a bridge. This segmentation allows the bridge to be isolated and protected by insulating films, preventing contaminants from causing complete capacitor failure while maintaining electrical connectivity between the electrode regions.
Solution Approach 2:
Insulating films are introduced as intermediary layers that cover and protect the bridge structure. These insulating films act as a barrier between the bridge and contaminants, preventing direct contact and potential damage while allowing the bridge to maintain its electrical connection function.
2Reliability
If the dielectric film is made continuous between electrodes for proper capacitor operation, then capacitance function is improved, but contaminants can cause short circuits through the dielectric film
Solution Approach 1:
The capacitor structure is segmented such that the dielectric film is positioned between separated electrode regions rather than spanning a continuous bridge area. This segmentation reduces the surface area of the dielectric film exposed to contaminants, lowering the probability of short circuits while maintaining sufficient capacitance through the separated electrode configuration.
3Area of stationary object
If bridges are made thin to minimize area and improve electrode separation, then electrode separation is improved, but the bridges become more susceptible to disconnection
Solution Approach 1:
Insulating films are applied as intermediary protective layers over the thin bridge structures. This protection allows the bridges to be made thin for better electrode separation and capacitance while the insulating films prevent contaminant-induced disconnection, compensating for the increased vulnerability of thinner bridges.
Data Source
AI summary
A capacitor device prevents capacitor failure and pixel failure by preventing the capacitor from experiencing a short circuit caused by disconnection of a bridge formed between electrodes of the capacitor and a display apparatus having the capacitor device. A display device comprises a thin film transistor, a light emitting device, and the capacitor device described above.