Display Device Input Sensor Noise Reduction via Overlapped Conductive Patterns
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Solution Overview
Problem
Existing display devices face challenges in achieving improved touch sensitivity while minimizing noise properties.
Innovation Solution
A display device design that includes a display panel with a base surface and an input sensor directly on the base surface. The input sensor features first and second sensing electrodes extended in perpendicular directions, covered by an insulating layer, and overlapped with conductive patterns that correspond to the sensing electrodes, reducing noise and enhancing touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing electrodes are directly placed on the base surface to improve touch sensitivity, then touch sensitivity is improved, but noise increases
Solution Approach 1:
An insulating layer is introduced as an intermediary between the sensing electrodes and the base surface. This insulating layer mediates the interaction, allowing the sensing electrodes to maintain direct contact with the base surface for high touch sensitivity while the insulating material blocks noise generation and propagation.
Solution Approach 2:
The structure employs composite materials by combining conductive sensing electrode materials with insulating layer materials. This composite approach enables the system to simultaneously achieve electrical conductivity for touch detection and electrical insulation for noise reduction, resolving the contradiction between sensitivity and noise.
2Measurement precision
If conductive patterns are added to match sensing electrodes to improve conductivity, then touch sensitivity is enhanced, but device complexity increases
Solution Approach 1:
The conductive patterns are merged with the existing sensing electrode structure, where the conductive patterns and sensing electrodes are integrated into a unified design. This merging approach enhances conductivity and touch sensitivity while avoiding the need for completely separate additional components, thereby limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution effectively reduces noise and improves touch sensitivity by utilizing conductive patterns that match the sensing electrodes' patterns, ensuring optimal conductivity and sensitivity while suppressing noise issues.
Implementation Method 1
an insulating layer covering the first and second sensing electrodes
Implementation Method 2
a first conductive pattern and a second conductive pattern, which are located on the insulating layer, are respectively overlapped with the first and second sensing electrodes
Data Source
AI summary
A display device includes a display panel having a base surface and an input sensor, which is on the base surface. The input sensor may include a first sensing electrode and a second sensing electrode, which are respectively extended in a first direction and a second direction crossing each other, an insulating layer covering the first and second sensing electrodes, and a first conductive pattern and a second conductive pattern, which are on the insulating layer, are respectively overlapped with the first and second sensing electrodes, and are spaced from each other. It may be possible to suppress a noise issue in the input sensor and to improve touch sensitivity of the input sensor.