Multi-Sensing Area Input Sensor for Display Devices
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Solution Overview
Problem
Existing display devices with integrated input sensors face challenges in efficiently managing multiple sensing areas, leading to increased resistance and load on the input sensors.
Innovation Solution
The display device incorporates a multi-sensing area input sensor system, where each sensing area is equipped with multiple conductive layers and insulating layers, and the input sensors are driven synchronously or independently to reduce signal interference and improve bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple sensing areas are integrated into a single input sensor, then the sensing coverage is improved, but the resistance of the electrodes increases
Solution Approach 1:
The input sensor is divided into multiple independent sensing areas (first sensing area, second sensing area, third sensing area), each with its own conductive layers and electrode structures. This segmentation allows each sensing area to have optimized electrode resistance independently, while collectively providing comprehensive sensing coverage across the entire display panel.
2Device complexity
If multiple sensing areas share common conductive layers, then the device complexity is reduced, but the signal interference increases
Solution Approach 1:
Different sensing areas are equipped with locally optimized conductive layer configurations. The first sensing area has a first conductive layer structure, while the second and third sensing areas have different conductive layer arrangements. This local differentiation minimizes signal interference between adjacent sensing areas while maintaining overall structural efficiency.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between adjacent sensing areas and between conductive layers. These insulating layers electrically isolate the conductive layers of different sensing areas, preventing signal interference while allowing the conductive layers to be positioned in close proximity for efficient sensing.
3Reliability
If the conductive layers are made thicker to reduce resistance, then the electrode resistance decreases, but the manufacturing precision requirements increase
Solution Approach 1:
The conductive layers are constructed using composite material structures, combining different conductive materials with insulating materials in a multi-layer configuration. This composite approach optimizes the electrical conductivity while maintaining manufacturable thickness parameters, avoiding the need for excessively thick single-layer conductive structures that would be difficult to manufacture with precision.
Data Source
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AI summary
A display device includes first and second input sensors and a display panel. The first and second input sensors are disposed in different sensing areas from each other. The first and second input sensors each include a first electrode and a second electrode crossing the first electrode. The first and second trace lines are connected to the first electrode. The trace line of the first and second trace lines, that overlaps the sensing area, overlaps the first electrode and does not overlap the second electrode in the sensing area.