Peripheral Touch Detection Electrode Configuration
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Solution Overview
Problem
Existing touch detection systems in display devices face challenges in accurately detecting objects in the peripheral region due to the large distance between detection electrodes and objects, leading to unsatisfactory detection performance.
Innovation Solution
A display device configuration that includes a first substrate with first electrodes in the display region, a second electrode perpendicular to the first substrate for forming capacitance, a third electrode in the peripheral region not overlapping the first electrodes, and a driver to supply drive signals to the third electrode and at least one first electrode simultaneously, enabling improved touch detection through mutual and self-capacitance methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrodes and drive configuration for touch detection are used in the peripheral region without any change, then the device complexity is kept simple, but the detection precision deteriorates due to large distance between object and detection electrodes
Solution Approach 1:
The touch detection system is segmented into two distinct electrode configurations: first electrodes disposed in the display region and second electrodes disposed in the peripheral region. This segmentation allows each electrode type to be optimized for its specific location, with the second electrodes positioned closer to the peripheral region objects to improve detection precision without requiring a complete redesign of the entire electrode system.
Solution Approach 2:
Different electrode configurations are applied to different regions of the display device. The first electrodes in the display region maintain their original configuration, while the second electrodes in the peripheral region are specifically positioned to reduce the distance to objects in that region. This local optimization improves detection precision in the peripheral region without affecting the overall device complexity significantly.
2Measurement precision
If the distance between object and detection electrodes in peripheral region is reduced, then detection precision is improved, but the device complexity increases due to additional electrode configurations
Solution Approach 1:
The first electrodes and second electrodes are merged into a single integrated electrode system that can operate in different modes. The driver can supply drive signals to either the first electrodes, the second electrodes, or both simultaneously, allowing the system to combine the advantages of both electrode configurations while sharing common structural elements and control infrastructure.
Solution Approach 2:
The electrode system is designed with multi-functionality, where the same electrode structures serve both display functions and touch detection functions. The first electrodes can detect touches in the display region, while the second electrodes extend detection capability to the peripheral region, allowing a single device structure to perform multiple detection functions without proportionally increasing 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
This configuration enhances touch detection sensitivity and accuracy in both the display region and peripheral region by increasing the number of electric force lines blocked by objects, thereby improving detection performance.
Implementation Method 1
a second electrode facing the first electrodes in a direction perpendicular to a surface of the first substrate and configured to form capacitance between the second electrode and the first electrodes
Data Source
AI summary
A display device includes a first substrate, a plurality of first electrodes, a second electrode, a third electrode, and a driver. The first electrodes are disposed in a display region of the first substrate. The second electrode faces the first electrodes in a direction perpendicular to the surface of the first substrate and forms capacitance between the second electrode and the first electrodes. The third electrode is provided in a peripheral region positioned on the outside of the display region and does not overlap the first electrodes in planar view. The driver supplies a drive signal to the third electrode and at least one of the first electrodes simultaneously.