Active Stylus Uplink Synchronization With Variable-Length Spread Signals
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Solution Overview
Problem
Existing touch-type input systems with bidirectional communication face inefficiencies due to uplink signals occupying communication resources, reducing the time available for downlink signals.
Innovation Solution
Implementing frame synchronization and variable-length commands with adjustable time lengths for uplink signals, and using different spread codes for partial signals to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bidirectional communication is implemented using time-division principles, then the stylus can be operated by commands sent from the sensor controller, but the communication time available for downlink signals is reduced
Solution Approach 1:
The patent applies dynamics by making the uplink signal duration variable rather than fixed. The sensor controller adjusts the time length of uplink signals based on the actual data transmission requirements, allowing flexible allocation of communication time between uplink and downlink operations. This dynamic adjustment resolves the contradiction by enabling efficient stylus control commands while preserving adequate time for downlink signal transmission.
Solution Approach 2:
The patent changes the parameter of signal transmission time from a fixed value to a variable value. By implementing variable-length uplink signals that adapt to the actual communication needs, the system optimizes the time allocation between uplink and downlink directions, thereby maintaining ease of operation while reducing time loss for downlink signals.
2Device complexity
If fixed-length uplink signals are used, then the communication protocol is simple, but communication resources are wasted when short commands need to be transmitted
Solution Approach 1:
The patent transitions from static fixed-length signals to dynamic variable-length signals. The uplink signal duration is now determined by the actual data content, allowing the system to transmit only the necessary amount of information. This dynamic approach prevents communication resource waste while maintaining reasonable protocol complexity through structured variable-length encoding.
Solution Approach 2:
The patent changes the signal length parameter from fixed to variable based on data requirements. This parameter change enables the system to adapt the uplink signal duration to the actual communication needs, eliminating unnecessary transmission time and reducing energy consumption while keeping the protocol manageable through standardized variable-length formats.
3Adaptability or versatility
If uplink signals occupy communication resources, then bidirectional communication is enabled, but the proportion of resources available for downlink signals decreases
Solution Approach 1:
The patent implements dynamics in the uplink signal transmission by making the duration adaptive to actual data needs. This allows the system to maintain bidirectional communication capability while optimizing the resource allocation ratio between uplink and downlink directions, thereby improving downlink transmission efficiency without sacrificing communication versatility.
Solution Approach 2:
The patent changes the uplink signal time parameter from fixed to variable, enabling dynamic resource allocation. This parameter change allows the system to adjust the proportion of communication resources between uplink and downlink based on actual transmission requirements, maintaining bidirectional capability while enhancing downlink productivity.
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
Reduces the proportion of communication resources occupied by uplink signals, allowing for more frequent and efficient transmission of both uplink and downlink signals.
Implementation Method 1
the sensor controller sends the first partial signal by way of direct spreading using a first spread code and sends the second partial signal by way of direct spreading using a second spread code
Implementation Method 2
the active stylus is synchronized with the uplink signal by detecting the first partial signal using the first spread code and thereafter detects the second partial signal using the second spread code
Data Source
AI summary
A sensor controller includes a transmitter configured to transmit an uplink signal including a first partial signal and a second partial signal. The transmitter is configured to transmit the first partial signal by direct spreading using a first spread code and transmit the second partial signal by direct spreading using a second spread code which is different from the first spread code and which has an identical chip time length to the first spread code. An active stylus includes a receiver configured to receive an uplink signal including a first partial signal and a second partial signal. The receiver is configured to synchronize with the uplink signal by detecting the first partial signal using a first spread code and thereafter detect the second partial signal using a second spread code, which is different from the first spread code and has an identical chip time length to the first spread code.