Display Device Sensing Electrode Noise Reduction via Insulation Pattern
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Solution Overview
Problem
Display devices often experience decreased touch sensitivity due to excessive noise levels in their signals.
Innovation Solution
An input sensing unit is integrated into the display device, featuring a sensing electrode directly on the display panel. The display panel includes a light emitting element, a pixel defining layer, multiple thin-films, and an insulation pattern, with specific configurations to reduce noise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensing electrode is disposed directly on the display panel, then touch sensitivity is improved, but noise level increases
Solution Approach 1:
An insulation pattern is introduced as an intermediary element between the sensing electrode and the underlying structures. This insulation pattern selectively blocks noise signals while allowing touch sensing signals to pass through, effectively mediating between the conflicting requirements of high touch sensitivity and low noise level.
Solution Approach 2:
The insulation pattern is applied locally at specific positions where noise interference occurs, rather than uniformly across the entire sensing electrode. This localized approach maintains touch sensitivity in active areas while blocking noise in specific interference zones, resolving the contradiction between sensitivity and noise reduction.
2Object-generated harmful factors
If multiple layers (pixel defining layer, thin-films, insulation pattern) are added to reduce noise, then noise level is reduced, but device complexity increases
Solution Approach 1:
The insulation pattern is merged with the existing pixel defining layer structure, combining noise reduction functionality with the existing pixel architecture. This integration approach reduces noise while minimizing the increase in device complexity by utilizing existing structural elements.
Solution Approach 2:
The pixel defining layer is designed to serve multiple functions: it defines pixel boundaries and simultaneously provides noise insulation for the sensing electrode. This multi-functionality approach reduces noise levels without proportionally increasing device complexity, as the same structure performs multiple roles.
Data Source
AI summary
A display panel including a pixel defining layer including a first portion, in which an opening to expose the first electrode is defined, and a second portion, which is disposed on the first portion and overlaps the first portion. A plurality of thin-films are disposed on the second electrode. An insulation pattern is disposed on the plurality of thin-films, overlaps the pixel defining layer, and overlaps the second portion. A distance between the first portion, which overlaps the insulation pattern, of the sensing electrode and the base insulation layer is greater than that between the second portion, which non-overlaps the insulation pattern, of the sensing electrode and the base insulation layer.