Touch Display Cathode Extension with Dam-Based Moisture Blocking
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Solution Overview
Problem
Existing display devices face issues with signal interference between the gate driving circuit and touch routing lines, leading to noise in touch sensing signals, and are susceptible to moisture penetration, which deteriorates touch performance and reliability.
Innovation Solution
The display device incorporates a dam and spacers to disconnect the extended cathode electrode, using a dummy conductive layer made of the same material as the cathode electrode, and includes a spacer between the dam and the gate driving circuit to minimize interference and block moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cathode electrode is extended to overlap with the gate driving circuit to shield signal interference, then touch sensing precision is improved, but moisture penetration risk increases
Solution Approach 1:
The patent introduces a dummy conductive layer as an intermediary element between the extended cathode electrode and the gate driving circuit. This dummy layer provides the necessary shielding effect for touch sensing while the spacer acts as a physical barrier to prevent moisture from reaching the electrode, thus resolving the contradiction between improving touch precision and preventing moisture penetration.
Solution Approach 2:
The patent segments the extended cathode electrode structure by introducing a spacer that divides it into separate regions. This segmentation allows the electrode to extend into the non-display area for shielding purposes while the spacer creates a discontinuity that blocks moisture penetration paths, thereby maintaining both touch sensing precision and moisture protection.
2Measurement precision
If the cathode electrode is extended into the non-display area to reduce noise, then touch sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the extended cathode electrode with the dummy conductive layer in the non-display area, creating a unified shielding structure. This merging approach provides effective noise reduction for touch sensing while consolidating multiple elements into a coordinated system, thereby improving touch accuracy without proportionally increasing device complexity.
3Reliability
If a dam structure is added to block moisture, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent designs the dummy conductive layer to serve multiple functions: it acts as a shield for touch sensing, provides a barrier against moisture penetration, and can be formed using the same deposition process as the cathode electrode. This multi-functionality improves reliability while minimizing additional manufacturing complexity by reusing existing process steps.
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.