Capacitive Input Sensing Electrode Layout for Reliable Touch Detection
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Solution Overview
Problem
Existing capacitive input sensing units in display apparatuses suffer from reduced external input sensitivity and electrical reliability.
Innovation Solution
A capacitive input sensing unit with improved design, including specific electrode configurations and insulation layers, enhances external input sensitivity and electrical reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If third electrodes are disposed in gaps between second electrodes and connected to first electrodes on the same layer, then manufacturing is simplified, but electrical reliability deteriorates due to potential short circuits
Solution Approach 1:
The patent resolves the contradiction by transitioning from a planar connection approach to a three-dimensional layered structure. Third electrodes are connected to first electrodes through connection patterns on a lower layer (first substrate) rather than direct planar connection, adding the vertical dimension to the connection architecture. This spatial separation prevents short circuits while maintaining manufacturing simplicity.
Solution Approach 2:
The patent introduces connection patterns as intermediary elements that mediate the electrical connection between third electrodes and first electrodes. These connection patterns act as reliable intermediaries that transmit electrical signals while physically separating the electrodes, preventing direct contact and potential short circuits.
2Device complexity
If third electrodes receive the same electrical signal as second electrodes, then device complexity is reduced, but external input sensitivity deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the electrical signal reception at different locations within the sensing unit. While second electrodes receive the driving signal for touch detection, third electrodes receive a different electrical signal (ground or reference potential). This localized differentiation enables the system to distinguish between touch inputs and other disturbances, improving external input sensitivity without significantly increasing overall 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 enhanced capacitive input sensing unit provides improved external input sensitivity and electrical reliability, ensuring effective user input detection and device performance.
Implementation Method 1
capacitive input sensing unit
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
An input sensing unit including a plurality of first electrodes, each of which including a plurality of first main patterns and a plurality of connection patterns disposed between the first main patterns to connect two first main patterns adjacent to each other, a plurality of second electrodes each of which including a plurality of second main patterns and a plurality of connection patterns disposed between the second main patterns to connect two second main patterns adjacent to each other, and a plurality of third electrodes receiving an electrical signal that is different from that received by the second electrode. Each of the third electrodes includes a plurality of third main patterns spaced apart from the second sensing patterns in a plan view and a plurality of third connection patterns disposed between the third main patterns to connect two third main patterns adjacent to each other and spaced apart from the first connection patterns in a plan view.