Stylus Controller Bit Rate Adjustment for Hover Signal Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional styluses face challenges in maintaining signal integrity and noise resistance when in hover state due to signal attenuation, leading to potential failures in receiving downlink signals, especially when sending signals with the same intensity as in contact state.
Innovation Solution
A stylus with an electrode and a controller that adjusts signal transmission bit rates based on the contact or hover state, using different demodulation processes to improve noise resistance and error correction, ensuring reliable signal reception even at greater distances from the sensor controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the stylus sends downlink signals with the same intensity in both hover and contact states, then the transmission power is simplified, but the signal-to-noise ratio deteriorates in hover state due to greater distance attenuation
Solution Approach 1:
The patent applies dynamics by making the bit rate adjustable based on the operational state. The controller dynamically switches between a first bit rate in contact state and a second bit rate in hover state, allowing the transmission characteristics to adapt to the changing distance and signal conditions without changing the physical transmission intensity
Solution Approach 2:
The patent changes the bit rate parameter to compensate for signal attenuation in hover state. By reducing the bit rate when hovering, the system maintains reliable signal reception without requiring variable transmission intensity, thus resolving the contradiction between transmission simplicity and reception reliability
2Reliability
If the stylus increases the intensity of downlink signals in hover state, then the signal-to-noise ratio improves, but the transmitter complexity increases due to requirement for variable intensity capability
Solution Approach 1:
Instead of changing the transmission intensity parameter, the patent changes the bit rate parameter to achieve the same goal of improving signal reception reliability. This approach maintains transmitter simplicity while still compensating for the greater signal attenuation in hover state
Solution Approach 2:
The patent uses different bit rates as a substitute for different transmission intensities. The second bit rate (lower than the first) serves as a copy or alternative method to achieve the effect of higher intensity transmission without requiring the physical capability to vary transmission power
3Reliability
If the stylus uses a lower bit rate in hover state, then the noise resistance improves, but the data transmission speed decreases
Solution Approach 1:
The system dynamically adjusts the bit rate based on the operational state. In contact state, the higher first bit rate provides fast data transmission, while in hover state, the lower second bit rate provides better noise resistance. This dynamic switching resolves the contradiction by allowing the system to optimize for the appropriate parameter depending on the current state
Solution Approach 2:
The patent changes the bit rate parameter to balance transmission speed and noise resistance. By using a lower second bit rate in hover state, the system improves noise resistance and signal reception reliability, accepting the trade-off of reduced transmission speed only when necessary
Data Source
AI summary
A stylus is provided, which includes a core body, an electrode disposed adjacent to the core body, a transmitter that sends a downlink signal including switch information SW1 using the electrode, and a controller that determines whether the stylus is in contact state with an operating surface or the stylus is in hover state. In the contact state, the controller controls the transmitter to send the switch information SW1 at a first bit rate. In the hover state, the controller controls the transmitter to send the switch information SW1 at a second bit rate smaller than the first bit rate. A technical advantage includes lowering the possibility of a failure to receive downlink signals when the stylus is in hover state, even though the stylus sends the downlink signals with the same intensity as when the stylus is in contact state.