Floating Electrode Design for Display Device Light Leakage
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Solution Overview
Problem
Display devices face issues with light leakage and static electricity-induced defects in the non-display areas, which affect the overall performance and image quality.
Innovation Solution
A display device design that includes a substrate with a display area and a non-display area, featuring thin film transistors, connection electrodes, insulating layers, floating electrodes, and bridge electrodes, which are strategically positioned and material-matched to prevent light leakage and static electricity transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection electrodes are disposed in the non-display area to connect thin film transistors, then electrical connectivity is improved, but light leakage occurs from the non-display area
Solution Approach 1:
A floating electrode is introduced as an intermediary element between the connection electrodes. This floating electrode is electrically isolated (not connected to any potential) and positioned to overlap with the connection electrodes, serving as a mediator that blocks light leakage while maintaining the electrical connectivity function of the connection electrodes.
Solution Approach 2:
The floating electrode is strategically positioned only in specific regions where light leakage occurs, rather than uniformly across the entire non-display area. This localized approach allows the connection electrodes to maintain their electrical function while the floating electrode addresses the light leakage problem only where needed.
2Reliability
If connection electrodes are disposed in the non-display area to connect thin film transistors, then electrical connectivity is improved, but static electricity is transmitted to internal components
Solution Approach 1:
The floating electrode acts as an intermediary barrier between external static electricity sources and the internal thin film transistors. Since the floating electrode is electrically isolated, it interrupts the transmission path of static electricity while allowing the connection electrodes to maintain their electrical connectivity function.
Solution Approach 2:
The electrical connection path is segmented by introducing the floating electrode as a separate, isolated element. This segmentation breaks the continuous electrical path that would otherwise allow static electricity to reach internal components, while still maintaining the necessary connectivity through the connection electrodes.
3Object-generated harmful factors
If floating electrode is added to prevent light leakage, then light leakage is reduced, but device complexity increases
Solution Approach 1:
The floating electrode serves multiple functions simultaneously: it blocks light leakage from the non-display area and interrupts static electricity transmission paths. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Data Source
AI summary
A display device capable of substantially preventing light leakage generated in a non-display area of the display device, the display device including: a substrate including a display area and a non-display area; a thin film transistor disposed in the display area; a first connection electrode disposed in the non-display area and connected to the thin film transistor; a second connection electrode disposed in the non-display area and disposed apart from the first connection electrode; a first insulating layer overlapping one end portion of the first connection electrode and one end portion of the second connection electrode; a floating electrode disposed on the first insulating layer; and a bridge electrode disposed on the second insulating layer, connected to the first connection electrode through a first contact hole, and connected to the second connection electrode through a second contact hole.