Touch Display Cathode Extension for Noise and Moisture Blocking
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Solution Overview
Problem
Display devices experience signal interference between gate driving circuits and touch routing lines, leading to noise in touch sensing signals, and are susceptible to moisture penetration, which deteriorates touch performance.
Innovation Solution
A display device design featuring a substrate with a gate driving circuit, a dam, a dummy conductive layer, and spacers that extend the cathode electrode to overlap with the gate driving circuit, while using a spacer to disconnect the cathode electrode and block moisture penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode electrode is extended to overlap with the gate driving circuit, then signal interference between the gate driving circuit and touch routing line is reduced, but moisture penetration risk increases
Solution Approach 1:
The extended cathode electrode is divided into multiple segments by insulating spacers, creating isolated conductive regions that maintain electrical functionality while preventing continuous moisture pathways. The segmentation allows the electrode to extend into the non-display area for shielding purposes without creating a continuous conductive path that could facilitate moisture ingress.
Solution Approach 2:
Insulating spacers are introduced as intermediary elements between the extended cathode electrode and the gate driving circuit. These spacers serve dual functions: maintaining proper electrical insulation while allowing the electrode to extend for shielding purposes, and simultaneously blocking moisture penetration paths.
2Measurement precision
If the cathode electrode is extended into the non-display area, then touch sensing noise is reduced, but device complexity increases
Solution Approach 1:
The extended cathode electrode structure serves multiple functions simultaneously: it acts as a shielding electrode to reduce electromagnetic interference with touch routing lines, maintains electrical connection for cathode functionality, and provides structural support when combined with spacers. This multi-functionality reduces the need for separate shielding structures.
Solution Approach 2:
The shielding function is merged with the cathode electrode itself by extending it into the non-display area, eliminating the need for separate shielding structures. The electrode extension combines noise reduction functionality with the existing cathode structure, simplifying the overall device architecture.
3Object-affected harmful factors
If the cathode electrode is disconnected by spacers, then moisture penetration is blocked, but electrical conductivity may be affected
Solution Approach 1:
The cathode electrode is segmented into multiple isolated conductive regions by insulating spacers. Each segment maintains electrical connectivity within its local area while the segmentation blocks continuous moisture pathways. The segments are positioned and dimensioned to ensure adequate electrical performance while providing moisture barriers.
Solution Approach 2:
The spacers are strategically positioned at specific locations where moisture penetration risk is highest, creating localized discontinuities in the electrode structure. This local modification provides moisture blocking at critical points while maintaining overall electrical conductivity in functional areas.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area surrounding the display area, the display device further includes a gate driving circuit disposed on the substrate and in the non-display area, the display device further includes a light emitting element disposed in the display area and on the substrate and including a cathode electrode, the display device further includes a dam disposed on the substrate and in the non-display area, the dam further outside the substrate than the gate driving circuit, the display device further includes a first dummy conductive layer disposed to cover the dam and made of the same material as the cathode electrode, and a spacer disposed between the gate driving circuit and the dam, and the cathode electrode extends from the display area to the non-display area to overlap with the gate driving circuit.