Input Sensor Electrode Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
Existing input sensors in display devices suffer from issues such as increased parasitic capacitance and electrical interference, leading to noise and reduced sensitivity due to the design of sensor lines and electrodes, which affects the performance and bezel size of electronic devices.
Innovation Solution
The design includes first sensor electrodes with multiple contact points and sensor lines that overlap the active area, reducing parasitic capacitance and electrical interference by distributing the electrical load, allowing for a narrower bezel and improved sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor lines are designed to connect sensor electrodes to the sensor driver, then electrical connection is achieved, but parasitic capacitance increases and electrical interference occurs
Solution Approach 1:
The sensor lines are divided into multiple segments (first sensor lines and second sensor lines) that connect to different sensor electrodes separately. This segmentation reduces the overall parasitic capacitance by distributing the capacitance across multiple smaller connections rather than having a single large connection, thereby improving sensitivity while maintaining electrical connection.
Solution Approach 2:
Different regions of the sensor are provided with different numbers of sensor lines based on local requirements. The first sensor electrode region receives more sensor lines than the second sensor electrode region, optimizing the electrical connection quality in areas where higher sensitivity is needed while reducing parasitic capacitance in areas where it is less critical.
2Reliability
If sensor lines overlap the active area to connect electrodes, then electrical connection is improved, but electrical interference and noise increase
Solution Approach 1:
The sensor lines are segmented into first and second groups that overlap different portions of the active area. This segmentation allows electrical connection to be maintained through overlapping while reducing electrical interference by distributing the overlapping regions across different areas, preventing concentration of interference in a single location.
3Measurement precision
If more sensor lines are used to improve sensitivity, then detection capability increases, but device complexity and bezel size increase
Solution Approach 1:
Instead of uniformly increasing the number of sensor lines across the entire sensor, the invention applies different numbers of sensor lines to different regions (first sensor electrode region vs. second sensor electrode region). This local quality approach improves detection sensitivity in critical areas while avoiding unnecessary complexity and bezel size increase in areas where high sensitivity is not required.
Data Source
AI summary
An input sensor includes a plurality of first sensor electrodes extending along a first direction in an active area, a plurality of second sensor electrodes extending along a second direction. A sensor driver is spaced apart from the active area in the second direction. A plurality of first sensor lines connects the first sensor electrodes to the sensor driver and overlap the active area. A plurality of second sensor lines connect the second sensor electrodes to the sensor driver. The first sensor electrodes include first to n-th row sensor electrodes sequentially arranged in a direction adjacent to the sensor driver. The number of first sensor lines electrically connected to the first row sensor electrode is larger than the number of first sensor lines electrically connected to the n-th row sensor electrode.