Stylus Speed Detection from Digitizer Uplink Signal Sequences
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Solution Overview
Problem
Existing methods for determining the speed of a stylus on a digitizer are either slow due to reliance on transmitting speed information from the digitizer to the stylus, leading to lag, or inaccurate when using accelerometers, which introduce noise in speed measurements.
Innovation Solution
A device with a sensor and controller that receives uplink signals from a grid of antennas and determines speed based on a detected sequence of signals relative to a predetermined spatial pattern, allowing for accurate and rapid speed calculation at the stylus itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If speed information is determined by the digitizer and transmitted to the stylus, then speed measurement is achievable, but response time is slow due to transmission lag
Solution Approach 1:
The stylus device performs self-measurement of its own speed by detecting the sequence of uplink signals from the antenna grid and comparing it to a predetermined spatial pattern. This eliminates the need for the digitizer to calculate and transmit speed information, allowing the stylus to obtain real-time speed data independently and immediately for applications like haptic feedback.
2Loss of time
If an accelerometer is used onboard the stylus to estimate speed, then speed information is available at the stylus, but measurement accuracy is poor due to noise
Solution Approach 1:
The patent replaces the mechanical accelerometer-based speed estimation with an electromagnetic signal detection method. The stylus detects the sequence of uplink signals from the antenna grid and determines speed based on the temporal and spatial characteristics of these signals, eliminating the noise and inaccuracies associated with mechanical acceleration sensors.
3Loss of information
If the digitizer determines stylus position and speed, then comprehensive tracking is achieved, but the stylus cannot obtain real-time speed for local processing
Solution Approach 1:
Instead of having the digitizer calculate speed from position data and transmit it to the stylus, the invention inverts the approach by enabling the stylus to directly measure its own speed through signal detection. The stylus analyzes the sequence of uplink signals it receives and independently determines its speed, eliminating the information transmission bottleneck.
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 provides fast and accurate speed determination at the stylus, reducing lag and noise, enabling timely and precise haptic feedback and other applications.
Implementation Method 1
a sensor configured to receive uplink signals emitted by a grid of antennas in the digitizer
Data Source
AI summary
A device for use with a touch surface digitizer, the device comprising: a sensor configured to receive uplink signals emitted by a grid of antennas in the digitizer; and a controller configured to detect the uplink signals via the sensor; wherein the controller is further configured to determine a speed of the device based on a detected sequence of the uplink signals as received at the sensor from one or more junctions of the antenna grid relative to a predetermined spatial pattern of the uplink signals as emitted across the grid.