Touch Processor Hover Detection via Electromagnetic Induction
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Solution Overview
Problem
Current touch systems face challenges in accurately detecting active pens hovering above touch devices, particularly in distinguishing between hovering and touching conditions, which affects precision and power efficiency.
Innovation Solution
The system induces a second electrical signal by a first electrical signal and detects its intensity to determine if a transmitter, such as an active pen, is hovering above the touch device, using a combination of driving and sensing electrodes to differentiate between hovering and touching states through threshold-based detection and frequency analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch panel uses traditional capacitive or resistive mechanisms to detect non-active pens, then the detection can be achieved, but the detection precision and ability to distinguish hovering from touching is insufficient
Solution Approach 1:
The patent introduces an electromagnetic field as an intermediary between the touch panel and the active pen. The driving electrodes generate an electromagnetic field that interacts with the transmitter in the active pen, enabling detection of hovering状态 through electromagnetic coupling without direct contact. This intermediary mechanism allows the system to distinguish between hovering and touching conditions by analyzing the characteristics of the electromagnetic signal interaction.
Solution Approach 2:
The patent replaces traditional mechanical contact-based detection (resistive) or simple capacitive sensing with an electromagnetic field-based detection system. By using driving electrodes to generate electromagnetic fields and sensing electrodes to detect changes in these fields, the system achieves more precise detection of active pens in hovering状态, substituting the mechanical sensing approach with an electromagnetic field interaction approach.
2Measurement precision
If the touch panel uses two modes to detect non-active pen/fingers and active pen in different time, then different detection requirements can be met, but the detection time and system complexity increase
Solution Approach 1:
The patent merges the detection modes for non-active pens and active pens into a single simultaneous operation. The driving electrodes and sensing electrodes work together in one detection cycle to identify both hovering active pens and touching objects, eliminating the need for sequential detection. This is achieved by analyzing the electromagnetic field interactions and signal characteristics within a unified detection framework, significantly reducing detection time.
Solution Approach 2:
The detection system is designed with multi-functionality to handle different input methods (active pen, non-active pen, finger) simultaneously using the same electrode structure. The system can identify the type of input object by analyzing the electromagnetic signal characteristics, allowing one detection mechanism to serve multiple detection purposes without requiring separate detection cycles for different object types.
3Length of stationary object
If the touch panel uses electromagnetic induction to detect active pen, then the detection distance can be extended, but the power consumption increases
Solution Approach 1:
The patent implements periodic action by using driving electrodes to generate electromagnetic fields at specific frequencies and detecting changes in these fields periodically. The system can adjust the detection frequency and intensity based on the detection requirements, allowing extended detection distance while controlling power consumption through optimized periodic electromagnetic field generation rather than continuous high-power operation.
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 ability to detect active pens at longer distances with reduced power consumption, improving detection accuracy and efficiency by distinguishing between hovering and touching conditions.
Implementation Method 1
inducing a second electrical signal by a first electrical signal approaching a touch device
Data Source
AI summary
A touch processor is provided by the present application. The touch processor detects the intensity of a third electrical signal, wherein a touch device induces a second electrical signal due to a first electrical signal, and the third electrical signal of the second electrical signal is transmitted from the touch device to an approached or touched object. Then, according to the intensity of the second electrical signal and the third electrical signal, the touch processor determines if there is a transmitter hovering on the touch device or not.