Digital Pen Pressure Encoding for Limited Sensor Bandwidth
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Solution Overview
Problem
The increasing size of data transmitted from pens to sensor devices, such as writing pressure values expressed with 8196 grayscale levels, has led to insufficient communication resources, particularly in systems with limited communication time during the display's non-driving period, and the rise of multi-pen systems has exacerbated this issue.
Innovation Solution
A pen system that compresses N-bit internal digital values into M-bit transmission data, using either a standard digital value or a relative digital value, allowing restoration of the original value at the sensor device, thereby reducing the required communication bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If N-bit internal digital values are transmitted directly from the pen to the sensor device, then the precision of writing pressure information is maintained, but the communication resource consumption increases and transmission time exceeds the available non-driving period
Solution Approach 1:
The patent transforms the transmission parameter from N-bit absolute digital values to M-bit relative digital values (where M < N). This parameter change reduces the data size while maintaining the ability to reconstruct the original precision information at the sensor device by combining relative values with a base value.
Solution Approach 2:
The patent introduces a base value (representing the most significant bits) as an intermediary that is transmitted separately from the relative digital values. This intermediary enables the sensor device to reconstruct the complete N-bit precision information by combining the base value with the received M-bit relative values, thus solving the contradiction between reduced transmission time and maintained precision.
2Reliability
If N-bit internal digital values are transmitted directly from the pen to the sensor device, then the accuracy of digital value transmission is maintained, but the communication resource insufficiency worsens in multi-pen systems
Solution Approach 1:
The patent changes the transmission parameter from N-bit absolute values to M-bit relative values (M < N), reducing the quantity of data transmitted. This allows multiple pens to share communication resources effectively while the sensor device reconstructs accurate N-bit values by combining the base value with received relative values, thus maintaining transmission accuracy.
Solution Approach 2:
The patent segments the N-bit digital value into two parts: a base value (most significant bits) and relative digital values (less significant bits). The base value is transmitted once and reused, while only the smaller M-bit relative values are transmitted for each writing pressure measurement. This segmentation reduces overall communication resource consumption while preserving full precision.
3Quantity of substance
If divided transmission over multiple non-driving periods is used, then the writing pressure value can be transmitted, but the communication time required increases and resource efficiency decreases
Solution Approach 1:
The patent changes the data representation parameter from N-bit absolute values to M-bit relative values (M < N), enabling complete writing pressure value transmission within a single non-driving period. This single-period transmission approach improves communication efficiency by eliminating the need for divided transmission across multiple periods.
Data Source
AI summary
A pen is configured to supply an N-bit internal digital value NA to a sensor device, and includes an integrated circuit that acquires a series of the internal digital values NA(s) based on a state OPS of a writing pressure detector. The integrated circuit supplies a first internal digital value NA to the sensor device by transmitting, from an antenna, first transmission data MF including a first standard digital value MS corresponding to the first internal digital value NA. The integrated circuit supplies a second internal digital value NA to the sensor device by transmitting, from the antenna, second transmission data MF that is smaller than N bits and includes an M-bit relative digital value (M<N) corresponding to a relative value between the first internal digital value NA obtained by restoration from the first standard digital value MS and the second internal digital value NA.