Orthogonal Multi-Row Touch Panel Stimulation for Fast Response
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Solution Overview
Problem
Conventional touch screen devices face limitations such as high current drain, poor response time, especially under fast motion, and performance degradation in extreme conditions with electromagnetic interference and contaminants.
Innovation Solution
The implementation of orthogonal multi-row stimulation logic and asymmetric scanning logic in capacitive touch panels, which allows for simultaneous stimulation of multiple rows and adaptive scanning to improve signal-to-noise ratio and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional single-row sequential stimulation is used, then device complexity is low, but response time is poor especially under fast motion
Solution Approach 1:
The touch panel rows are divided into multiple groups, with each group stimulated by a dedicated stimulation logic unit. This segmentation allows parallel processing of multiple row groups simultaneously, significantly improving response time while keeping each individual stimulation logic unit relatively simple in structure.
Solution Approach 2:
Multiple stimulation logic units are combined to work together in parallel, each handling a specific group of rows. This merging of multiple simple units achieves the effect of complex parallel processing without requiring a single overly complex stimulation logic unit.
2Loss of energy
If conventional scanning methods are used, then power consumption is moderate, but current drain is too great affecting power dissipation
Solution Approach 1:
The stimulation logic employs periodic scanning cycles where multiple rows are stimulated in alternating phases. During each phase, only a subset of rows is actively stimulated while others are in a low-power state, reducing overall current drain and power dissipation compared to continuous scanning of all rows.
Solution Approach 2:
Instead of stimulating all rows simultaneously or sequentially with equal intensity, the system applies partial stimulation to multiple rows in parallel. This partial action approach reduces the peak current demand on any single row while maintaining overall touch detection capability, thereby reducing power dissipation.
3Reliability
If conventional touch screen stimulation is used, then basic functionality is achieved, but performance degrades in environments with electromagnetic interference and contaminants
Solution Approach 1:
The touch controller incorporates feedback mechanisms that continuously monitor the quality of touch signals and adaptively adjust stimulation parameters. When electromagnetic interference or contaminants are detected, the system can increase stimulation intensity or adjust scanning patterns to maintain reliable touch detection despite adverse environmental conditions.
Solution Approach 2:
The stimulation logic dynamically changes operational parameters such as stimulation frequency, amplitude, and scanning patterns based on detected environmental conditions. These parameter adjustments allow the system to maintain optimal performance in extreme conditions with electromagnetic interference and contaminants by adapting to the specific interference characteristics.
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 approach enhances the performance and durability of touch screen devices by improving response time and reducing power consumption while maintaining effectiveness in challenging environments.
Implementation Method 1
conventional touch screen devices have been limited in their usage to date. For some devices, current drain has been too great.
Data Source
AI summary
Control circuitry for a touch panel includes a touch panel interface, a memory comprising scanning logic, and a controller in communication with the memory and the touch panel interface. The controller is operable, when the scanning logic is executed, to energize a first and a second row in the touch panel simultaneously, a first time; obtain a first signal measurement along a column intersecting the first and second rows; energize the first and the second row in the touch panel simultaneously, a second time; obtain a second signal measurement along the column; and determine a first pixel value and a second pixel value along the column from the first signal measurement and the second signal measurement.