Touch Sensing Device Multi-Protocol Pen Search
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Solution Overview
Problem
Existing touch sensing technologies are limited in their ability to operate with multiple active pens, requiring a change in signal transmission and reception processes for each pen, which complicates data communication and synchronization.
Innovation Solution
A touch sensing device that includes a driving circuit to transmit uplink signals and a sensing circuit to receive downlink signals, allowing it to search and communicate with various active pens by using distinct protocols and timing for each pen within a frame, enabling operation with multiple active pens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a touch sensing device uses a single protocol for communicating with active pens, then the device complexity is reduced, but the adaptability to various active pens deteriorates
Solution Approach 1:
The touch sensing device is designed to support multiple communication protocols (first protocol and second protocol) simultaneously, enabling it to communicate with different types of active pens using their respective protocols. The driving circuit transmits uplink signals according to the first protocol in a first time section and according to the second protocol in a second time section, making the device universally compatible with various active pens without requiring separate device designs for each protocol
2Measurement precision
If the touch sensing device searches for each active pen separately in each frame, then the measurement precision of pen detection is improved, but the productivity of the system deteriorates
Solution Approach 1:
The frame structure is segmented into multiple time sections, with each time section dedicated to searching for specific active pens using their respective protocols. The first time section is used for searching active pens using the first protocol, while the second time section is used for searching active pens using the second protocol. This segmentation allows precise detection of each pen type while maintaining efficient system operation by parallelizing the search process across different time sections within a single frame
3Productivity
If the touch sensing device transmits uplink signals for all active pens in each frame, then the productivity of data communication is improved, but the use of energy deteriorates
Solution Approach 1:
The driving circuit transmits uplink signals periodically within each frame, but only during specific time sections dedicated to each protocol. Uplink signals for the first protocol are transmitted in the first time section, and uplink signals for the second protocol are transmitted in the second time section. This periodic transmission approach maintains high data communication efficiency by ensuring all active pens receive signals regularly, while reducing energy consumption by avoiding continuous transmission across the entire frame
Data Source
AI summary
In an embodiment, various active pens may be searched for in every frame, so that various active pens may operate in a touch sensing system.