Stylus Electrode Timing for Pressure Transmission Without Bluetooth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing styluses without Bluetooth modules face challenges in transmitting pressure sensing values to electronic devices, requiring additional circuitry that increases design complexity.
Innovation Solution
A method utilizing two electrodes in the stylus to send signals based on a refresh rate and pressure sensing values, allowing the electronic device to determine pressure sensing values through the presence or absence of these signals at specific moments, without the need for Bluetooth or additional circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency modulation is used to transmit pressure sensing values through the electrode, then pressure sensing values can be transmitted without Bluetooth, but device complexity increases due to additional frequency modulation circuitry in the stylus and multi-frequency detection circuitry in the electronic device
Solution Approach 1:
The patent divides the transmission of pressure sensing values into two independent parts: a first signal sent at regular intervals (N signals at N moments) and a second signal sent only when pressure changes (M signals at M moments). This segmentation allows the electronic device to distinguish between different pressure levels by comparing the timing and presence of signals, eliminating the need for complex frequency modulation circuitry while maintaining transmission capability.
Solution Approach 2:
The patent uses periodic signal transmission where the first signal is sent at regular intervals based on refresh rate, and the second signal is sent periodically based on pressure sensing changes. The electronic device detects pressure sensing values by analyzing the periodicity and timing relationships between these signals, replacing complex frequency modulation with simple temporal coding that requires minimal additional circuitry.
2Loss of information
If multiple signals are sent through electrodes to transmit pressure information, then pressure sensing values can be transmitted, but the design complexity of the stylus and electronic device increases
Solution Approach 1:
The patent makes the electrode serve multiple functions: it transmits both the first signal (for position and basic touch detection) and the second signal (for pressure sensing). By multiplexing these functions onto the same electrode, the system avoids adding separate transmission components, thereby reducing overall device complexity while maintaining complete pressure information transmission capability.
Solution Approach 2:
The patent creates a simplified copy of the pressure information through the timing and presence patterns of the second signal relative to the first signal. Instead of directly encoding pressure as an analog quantity requiring complex circuits, the system creates a digital-like representation through the temporal pattern of signals, which can be processed with simpler circuitry while preserving all pressure information.
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Embodiments of this application provide an information transmission method and an apparatus, and relate to the field of terminals, to transmit information (for example, a pressure sensing value) to an electronic device when a stylus has no Bluetooth module and device complexity is not increased. The method includes: A first electrode sends N first signals based on a refresh rate, where the N first signals correspond to N sending moments, and N is an integer greater than or equal to 1. A second electrode sends M second signals based on a pressure sensing value detected by the stylus or a type of an operation performed by a user on the stylus, where the M second signals correspond to M sending moments, the M sending moments overlap some or all of the N sending moments, and M is an integer less than or equal to N. The electronic device receives the first signal and the second signal. The electronic device obtains target coding data based on the first value and/or the second value recorded at the N moments, where the target coding data is used to represent the pressure sensing value or the type of the operation performed by the user on the stylus.