Pen-Sensor Frame Communication for Stable Data and Output Timing
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Solution Overview
Problem
Existing communication methods in position detection systems face challenges in maintaining the periodicity of normal data transmission due to the large size of commands and increased bits in pen-pressure values, leading to potential omission of normal data and inappropriate control of output devices in pens.
Innovation Solution
A communication method that separates the transmission of data type and value into different frames, uses shortened pen-pressure values, and controls output devices based on recognition information, ensuring appropriate timing and maintaining normal data periodicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If setting data (such as 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 periodicity of normal data transmission is affected
Solution Approach 1:
The patent segments the data setting process into two separate frames: the first frame transmits only the data type identifier, and the second frame transmits the actual data value. This segmentation prevents the uplink signal from becoming excessively large while maintaining the ability to configure pen parameters, thus resolving the contradiction between adaptability and transmission timing.
2Measurement precision
If the pen-pressure value uses more bits (e.g., 12 bits), then the precision of pressure detection is improved, but the downlink signal size increases making it difficult to transmit both response data and normal data
Solution Approach 1:
The patent extracts the pen-pressure value transmission from the normal data transmission flow and places it in a dedicated data signal portion of the downlink signal. This extraction allows the high-precision 12-bit pressure value to be transmitted without competing for space with response data, resolving the contradiction between measurement precision and data volume.
3Ease of operation
If the output device is controlled according to pen-pressure value detected by the pen, then the writing experience is enhanced, but the output device is controlled even when the pen tip is pressed against non-touch surfaces
Solution Approach 1:
The patent implements a feedback mechanism where the sensor controller monitors whether the pen is actually in contact with the touch surface before triggering output device control. The controller receives position information and determines contact state, then selectively transmits control signals to the pen's output device only when appropriate contact is detected, eliminating false activations while preserving enhanced writing feedback.
Data Source
AI summary
Provided is a communication method for communication performed between a pen and a sensor controller that, in operation, transmits uplink signals to the pen in a frame cycle. The communication method includes transmitting, by the sensor controller, a first uplink signal in a first frame, the first uplink signal including an identifier that identifies a type of data to be transmitted to the pen in a second frame following the first frame, and transmitting, by the sensor controller, a second uplink signal in the second frame, the second uplink signal including a value of the data of the type indicated by the identifier.