Touch Device Stylus Scan Order Adjustment for Fast Reconnection
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Solution Overview
Problem
Existing touch devices face challenges in quickly detecting the position of an active pen after a connection interruption, leading to inefficiencies and increased power consumption.
Innovation Solution
A touch device with a driving circuit that divides the touch panel into stylus connection areas, enabling them one by one in a specific scan order during discovery periods to detect the stylus position, and adjusting the scan order based on the last connected area to quickly re-establish connection when interrupted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the touch panel scans all stylus connection areas in a fixed order during discovery period, then the detection process is simple and systematic, but the time to detect stylus position increases and power consumption increases
Solution Approach 1:
The system performs preliminary scanning during the discovery period to identify the hit area where the stylus is located. This preliminary action allows the system to store the scan order and hit area information for subsequent use during the normal period, reducing detection time when connection is interrupted.
Solution Approach 2:
The scan order is made dynamic rather than fixed. During the discovery period, the system scans all areas in a first scan order, but during the normal period, it adjusts to a second scan order based on the hit area location. This dynamic adjustment optimizes detection speed while adapting to different operational states.
2Reliability
If the touch panel continuously scans all stylus connection areas during normal period, then the stylus position can be tracked continuously, but the power consumption increases significantly
Solution Approach 1:
The system extracts and focuses scanning resources on the hit area during the normal period, disabling scans in non-hit areas. This extraction of the essential scanning function to only the necessary region maintains connection reliability while significantly reducing power consumption compared to scanning all areas continuously.
Solution Approach 2:
Different scanning qualities are applied to different regions: the hit area receives continuous monitoring with adjusted scan order to maintain connection reliability, while non-hit areas have scanning disabled to reduce power consumption. This local differentiation optimizes both reliability and energy efficiency.
3Productivity
If the touch panel uses a fixed scan order for all discovery periods, then the control logic is simple, but the detection speed decreases when stylus reconnects
Solution Approach 1:
The system uses feedback from the hit area identification during the discovery period to adjust the scan order for subsequent operations. The scan order management system incorporates information about where the stylus was detected, using this feedback to prioritize scanning in relevant areas during reconnection, thereby improving detection speed.
Solution Approach 2:
The system performs preliminary scanning during the discovery period to establish the hit area and stores this information for future use. This preliminary action enables the system to prepare an optimized scan order in advance, improving detection speed when the stylus reconnects without requiring complex real-time decision-making.
Data Source
AI summary
The disclosure provides a touch device and an operation method thereof. A touch panel of the touch device is divided into a plurality of stylus connection areas. During a first discovery period, the stylus connection areas detect a stylus one by one in a first scan order. When the stylus is located in one of the stylus connection areas (a hit area), the first discovery period is ended to enter a normal period, and the hit area establishes a connection to the stylus. When the connection between the stylus and the touch panel is interrupted, the normal period is ended to enter a second discovery period, and the first scan order is adjusted to a second scan order according to the hit area in the normal period. During the second discovery period, the stylus connection areas detect the stylus one by one in the second scan order.