Active Pen Communication Frames for Timed Haptic Control
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Solution Overview
Problem
Existing communication methods in position detection systems face challenges in setting data to a pen while maintaining the periodicity of normal data, transmitting response data, and controlling output devices in the pen at appropriate timings due to large data sizes and recognition information transmission difficulties.
Innovation Solution
A communication method that transmits data type and value in separate frames using uplink signals, includes a shortened pen-pressure value in downlink signals, and controls output devices based on recognition information and control information from the sensor controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If setting data (e.g., BrushColor) is placed in an uplink signal command, then the pen can be configured with drawing parameters, but the uplink signal size increases and the downlink signal transmission time is reduced
Solution Approach 1:
The patent divides the uplink signal into multiple segments: a command portion and a data portion. The command portion contains instructions while the data portion contains setting values. This segmentation allows the pen to process commands and retrieve data in separate time slots, maintaining periodic downlink signal transmission while enabling comprehensive data setting functionality.
Solution Approach 2:
The sensor controller transmits the command portion of the uplink signal in advance, allowing the pen to prepare for data reception. The actual setting data is transmitted in a subsequent data portion, enabling the pen to maintain its periodic transmission schedule while receiving configuration information without extending the immediate signal exchange time.
2Productivity
If response data and normal data are placed in a single downlink signal, then data transmission is efficient, but the pen-pressure value (12 bits) cannot be transmitted alongside response data
Solution Approach 1:
The downlink signal is segmented into a response data portion and a normal data portion. The response data portion carries acknowledgment or status information, while the normal data portion carries the 12-bit pen-pressure value and other operational data. This segmentation allows both response data and high-resolution pressure data to be transmitted simultaneously without conflict.
3Measurement precision
If recognition information is transmitted frequently to control output devices, then output device control accuracy improves, but communication overhead increases and normal data periodicity is disrupted
Solution Approach 1:
The patent extracts recognition information transmission from the main periodic downlink signal. Instead of embedding recognition data in every downlink signal, the system transmits recognition information separately and less frequently, only when changes occur or at predetermined intervals. This maintains the periodicity of normal data transmission while providing sufficient recognition information for output device control.
Data Source
AI summary
An active pen that communicates with a sensor controller. The active pen includes a haptic element and an integrated circuit coupled to the haptic element. The integrated circuit receives a first uplink signal that is transmitted by the sensor controller, acquires first control information from the first uplink signal, determines a value of the first control information, and controls the haptic element based on the first control information. To determining that the value of the first control information is a first value, the integrated circuit starts controlling the haptic element, and, in response to determining that the value of the first control information is a second value, the integrated circuit stops controlling the haptic element.