Active Pen Position Detection for Ghost-Free Pointer Tracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional position detectors face challenges in accurately distinguishing between the contact positions of active pens and passive pointers, leading to mutual misrecognition and irregular detection intervals, which can result in unnatural drawing results and unnecessary line segments due to ghost positions.
Innovation Solution
A pointer position detection method that includes detecting pen signals and capacitance changes to distinguish between active and passive pointers, using a sensor controller to perform time-divided detection processes and exclude ghost positions, ensuring regular intervals and accurate output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same sensor is used to detect both active pen and passive pointer, then device complexity is reduced, but detection precision deteriorates due to mutual misrecognition between pen and pointer positions
Solution Approach 1:
The patent segments the detection process into distinct time intervals: active pen detection is performed during periods when the sensor transmits signals and receives responses, while passive pointer detection is performed during other time periods. This temporal segmentation allows a single sensor to accurately detect both pointer types without mutual interference, resolving the position misrecognition issue while maintaining device simplicity.
Solution Approach 2:
The patent implements periodic action by alternating between active pen detection cycles and passive pointer detection cycles. The sensor controller periodically switches detection modes based on timing signals, ensuring that each pointer type is detected at appropriate intervals. This periodic detection scheme maintains both detection accuracy and regular detection rates for drawing operations.
2Measurement precision
If time-divided detection is used for active pen and passive pointer, then mutual misrecognition is reduced, but detection regularity deteriorates leading to irregular detection intervals
Solution Approach 1:
The patent applies dynamics by making the detection scheme adaptive rather than fixed. The sensor controller dynamically adjusts detection priorities based on detected pointer types: when an active pen is detected, the system increases active pen detection frequency; when only passive pointers are present, passive pointer detection is performed at regular intervals. This dynamic adjustment maintains detection regularity while ensuring accurate pointer distinction.
Solution Approach 2:
The patent implements feedback mechanisms where detection results from one pointer type inform subsequent detection scheduling. When the sensor controller detects an active pen, it receives feedback that triggers increased active pen detection frequency. This feedback loop ensures that detection intervals remain regular and appropriate for the current drawing operation, preventing unnatural drawing results while maintaining accurate pointer distinction.
3Manufacturing precision
If active pen detection frequency is increased, then drawing precision is improved, but productivity deteriorates due to reduced passive pointer detection rate
Solution Approach 1:
The patent changes detection parameters dynamically based on the detected pointer type. When an active pen is detected, the system increases the active pen detection frequency to maintain high drawing precision. Simultaneously, it adjusts passive pointer detection frequency to maintain overall productivity. This parameter adjustment ensures that high-resolution active pen detection does not unduly reduce the detection rate needed for smooth drawing operations.
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 method enables correct distinction between active pen and passive pointer positions, maintaining detection rates, and preventing unnecessary line segments, resulting in more natural and precise drawing outcomes.
Implementation Method 1
The EMR pen is an electronic pen configured to transmit an alternating magnetic field from a pen tip
Implementation Method 2
The active pen is an electronic pen configured to transmit signals from a pen tip by utilizing an electric field
Implementation Method 3
a function of detecting capacity coupling formed between a distal end of the passive pointer (e.g., finger tip) and an electrode disposed inside the sensor
Data Source
AI summary
Disclosed is a sensor controller for detecting a position of a pointer within a predetermined region. The sensor controller includes a memory and a processor that, in operation: performs a partial detection process of a first detection process at a first detection rate, acquires first partial detection data indicating whether a pointer is detected based on the partial detection process, stores the first partial detection data in the memory, combines the first partial detection data stored in the memory with second partial detection data previously stored in the memory and associated with the first detection process to obtain combined partial detection data, generates complete detection data indicating whether the pointer is detected throughout the predetermined region based on the combined partial detection data, and outputs the complete detection data at the first detection rate.