Display Electrode Configuration for Dual-Mode Touch Sensing
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Solution Overview
Problem
Existing touch detection methods for display apparatuses, such as the capacitance method and electromagnetic induction method, face challenges in effectively detecting external proximity objects without modifying the electrodes and wiring configurations, leading to difficulties in satisfactory performance.
Innovation Solution
A display apparatus is designed with a substrate featuring pixel electrodes, detection electrodes arranged in a matrix, detection electrode lines, switching elements, and a drive circuit that outputs specific drive signals during sensing periods to facilitate both electromagnetic induction and self-capacitive touch detection, enhancing detection sensitivity and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the capacitance method or electromagnetic induction method is used for touch detection, then external proximity objects can be detected, but the electrodes and wiring configuration must be significantly modified to achieve satisfactory detection performance
Solution Approach 1:
The patent applies multi-functionality by enabling the same electrode configuration to perform both electromagnetic induction touch detection and self-capacitive touch detection. The first electrodes serve dual purposes: generating magnetic fields for electromagnetic induction detection and acting as detection electrodes for self-capacitive detection. This eliminates the need for separate electrode systems for each detection method, resolving the contradiction between detection performance and configuration complexity.
2Ease of manufacture
If electromagnetic induction method is implemented using existing display apparatus electrodes, then no additional components are needed, but satisfactory touch detection performance cannot be achieved
Solution Approach 1:
The patent applies parameter changes by optimizing the electrode configuration parameters - specifically arranging first electrodes in a matrix pattern with specific spacing and dimensions that enable effective magnetic field generation for electromagnetic induction detection. The electrode width, spacing, and arrangement are tuned to achieve satisfactory detection performance while using the existing electrode manufacturing process, thus resolving the contradiction between implementation simplicity and detection performance.
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 solution enables improved detection sensitivity and responsiveness for both electromagnetic induction and self-capacitive touch detection, allowing for effective detection of external objects, including fingers and pens, by optimizing the configuration of electrodes and drive signals.
Implementation Method 1
a drive circuit configured to output a first drive signal in a first sensing period in which an electromagnetic induction method is used
Data Source
AI summary
According to an aspect, a display apparatus includes: a substrate; a plurality of pixel electrodes; a plurality of detection electrodes arranged in a matrix in a display area of the substrate; a plurality of detection electrode lines coupled to the respective detection electrodes; a plurality of first electrodes provided in the same layer as the detection electrodes or the detection electrode lines and extending in a first direction; a plurality of switching elements coupled to the respective pixel electrodes; a plurality of signal lines coupled to the switching elements and extending in a second direction crossing the first direction; a coupling member provided in a peripheral area outside the display area and configured to couple ends of the first electrodes to each other; and a drive circuit configured to output a first drive signal in a first sensing period in which an electromagnetic induction method is used.