Multi-Level Driver for Input Device Signal Precision
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Solution Overview
Problem
Conventional input devices, such as capacitive touch screens, face limitations in signal transmission due to single driver capabilities, leading to signal distortion and misidentification, especially in edge areas where signal reduction occurs, making precise writing and hovering difficult.
Innovation Solution
Implementing a multi-level driver system that allows for various signal outputs across sensor loops, enabling improved signal analysis and reducing noise and distortion, while selectively adjusting driver capacity based on input unit states to enhance hovering performance and minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single driver is used to drive sensor loops, then device complexity is reduced, but signal level is limited and cannot accommodate high signal requirements in edge areas
Solution Approach 1:
The driver system is segmented into multiple drivers (first driver and second driver) with different signal levels. Each driver can independently drive sensor loops, allowing edge area sensor loops to receive higher signal levels from the second driver while central area sensor loops use the first driver, thus resolving the contradiction between signal level requirements and device complexity.
Solution Approach 2:
Different signal levels are applied to different spatial locations of the sensor loops. Edge area sensor loops receive higher signal levels to compensate for signal reduction near metal brackets, while central area sensor loops use standard signal levels. This local differentiation resolves the contradiction by providing targeted high power where needed without unnecessarily increasing overall device complexity.
2Reliability
If driver capacity is increased to improve signal level, then signal distortion is reduced, but power consumption increases
Solution Approach 1:
The system changes the signal level parameter dynamically based on spatial location and operational mode. High signal levels are applied only to edge area sensor loops when needed, while central area sensor loops use standard signal levels. This selective parameter adjustment improves signal accuracy where required without proportionally increasing overall power consumption.
Solution Approach 2:
Instead of uniformly increasing driver capacity across all sensor loops, the system applies excessive signal level (higher capacity) only partially to edge area sensor loops that require it, while using standard capacity for central area sensor loops. This partial application of excessive action achieves the required signal accuracy without the full power consumption cost of universally high-capacity drivers.
3Manufacturing precision
If high signal level is applied to edge area sensor loops, then writing precision is improved, but power consumption increases
Solution Approach 1:
High signal levels are applied locally only to edge area sensor loops where writing precision is compromised by metal bracket interference. Central area sensor loops continue to use standard signal levels. This localized approach improves writing precision in affected areas without proportionally increasing overall power consumption.
4Measurement precision
If multiple drivers with different capacities are used, then hovering performance is improved, but device complexity increases
Solution Approach 1:
The driver system is segmented into multiple drivers with different capacities, where each driver is assigned to specific sensor loop groups. The controller selectively activates appropriate drivers based on operational mode (hovering or writing), improving hovering accuracy through higher signal levels while managing complexity through systematic driver assignment and selection logic.
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 solution enhances writing precision and hovering accuracy in edge areas by increasing signal levels and capacity, reducing misidentification and power consumption, and improving overall input device performance.
Implementation Method 1
an electromagnetic type digitizer and a driving method thereof
Data Source
AI summary
One or more embodiments provide an input device including a multi-level driver and an operating method thereof. The input device includes a sensor board that includes at least one loop. The input device also includes at least one multi-level driver that includes a plurality of drivers, and is configured to output, to the at least one loop, a signal generated based on signals output from the plurality of drivers.