Touch Device Input Trace Identification via Signal and Area Thresholds
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Solution Overview
Problem
Touch panels struggle to correctly identify which touch trace belongs to which input device when multiple devices are in contact simultaneously, leading to incorrect handwriting recognition and a poor user experience.
Innovation Solution
A touch device and method that involve a processor coupled to a touch screen, where a first input device transmits a signal with an identification code when touching, and the processor determines the event's ownership based on a pre-determined signal duration and area threshold, distinguishing between different input devices like stylus and dial controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch panel uses conventional touch detection methods, then it can detect touch traces, but it cannot correctly identify which touch trace belongs to which input device when multiple devices are in contact simultaneously
Solution Approach 1:
The patent segments the touch detection process by dividing it into multiple detection dimensions: touch area size detection, signal transmission detection, and touch duration detection. Each dimension provides a separate criterion for identifying input device ownership, allowing the system to distinguish between multiple simultaneous touches by evaluating all segments together rather than relying on a single ambiguous detection method
Solution Approach 2:
The patent introduces an intermediary identification mechanism that acts as a mediator between the touch trace and the input device. This mechanism uses multiple detection criteria (area threshold, signal presence, time window) as intermediary steps to bridge the gap between the raw touch trace data and the final device identification, enabling accurate attribution of touch traces to specific input devices
2Measurement precision
If the touch panel increases detection sensitivity to distinguish multiple devices, then it can identify touch traces better, but it increases complexity of the detection system
Solution Approach 1:
The patent makes the existing touch panel components multi-functional by enabling them to perform multiple detection tasks simultaneously. The touch detection circuit not only detects touch presence but also measures touch area, detects signal transmission, and measures touch duration. This universal approach allows the system to distinguish multiple input devices using the same hardware infrastructure, avoiding the need for additional specialized detection devices and reducing overall system complexity
Solution Approach 2:
The patent employs parameter changes by utilizing multiple detectable parameters from the same touch event: touch area size, signal transmission characteristics, and touch duration. By analyzing changes in these parameters simultaneously, the system can distinguish between different input devices without adding complex detection hardware, as each parameter provides additional discriminatory information that can be extracted from existing sensor outputs
Data Source
AI summary
A touch device including a touch screen, a first input device and a processor is provided. At a first start time, when the first input device touches on the touch screen with a first touch area at a first position, the touch screen generates a first event, and the first input device transmits a first signal to the touch screen. The processor is coupled to the touch screen. When the touch screen receives the first signal during a pre-determined period from the first start time and the first touch area is larger than a first area threshold, the processor determines that the first event belongs to the first input device and that the first position is a start position of the first input device.