EMR Touch Panel Electrode Layout for Faster Scanning
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Solution Overview
Problem
Existing touch panels using electromagnetic resonance (EMR) methods face a reduced scan rate due to the need for time-division driving of magnetic fields, and there is a need to improve touch sensitivity at the edge portions.
Innovation Solution
A display device with a touch panel that includes varying the number and distance of charge electrodes to which different phase charge voltages are applied, along with a dummy charge electrode to enhance sensitivity, particularly at the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-division driving is used to form magnetic fields in all areas of the touch panel, then electromagnetic resonance touch detection is enabled, but the scan rate of the touch panel is reduced
Solution Approach 1:
The charge electrodes are divided into multiple groups (first charge electrodes, second charge electrodes, third charge electrodes, fourth charge electrodes) that can be independently controlled. This segmentation allows different groups to operate simultaneously with different phases, enabling parallel processing and improving scan rate while maintaining comprehensive touch detection coverage across the display panel.
Solution Approach 2:
The patent implements periodic charge voltage application to different electrode groups in alternating phases. First charge electrodes receive charge voltage in alternating phases with second charge electrodes, and third charge electrodes receive charge voltage in alternating phases with fourth charge electrodes. This periodic action enables continuous magnetic field generation across different regions, maintaining high scan rates while ensuring complete touch detection coverage.
2Ease of manufacture
If charge electrodes are distributed uniformly across the touch panel, then manufacturing is simplified, but touch sensitivity at edge portions is reduced
Solution Approach 1:
The patent applies different electrode configurations to different regions of the touch panel. Dummy charge electrodes are specifically added at edge portions (first edge, second edge, third edge, fourth edge) to enhance local magnetic field strength in these regions. This local quality enhancement improves touch sensitivity at edges without complicating the overall manufacturing process, as the dummy electrodes follow the same fabrication steps as regular charge electrodes.
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 increases the scan rate of the touch panel by optimizing charge electrode distribution and introduces a dummy charge electrode to improve edge sensitivity, enhancing overall touch detection efficiency.
Implementation Method 1
a magnetic field is required to be formed in all areas of the touch panel to sense and charge the stylus pen
Implementation Method 2
The touch panel may form the magnetic field in all areas through time-division driving
Data Source
AI summary
A display device includes a display panel including sub-pixels, a display panel driver configured to control the display panel, a touch panel including a touch sensor including a plurality of touch electrodes and a charger including a plurality of charge electrodes, and a touch panel driver configured to provide a first charge voltage having a first phase to N first charge electrodes among the charge electrodes in a first charge period, and provide the first charge voltage to M (M is different from N) second charge electrode among the charge electrodes in a second charge period.