Pen Pressure Data Compression for Multi-Pen Sensor Systems
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Solution Overview
Problem
The increasing size of data transmitted from pens to sensor devices, such as writing pressure values expressed in 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 exacerbates 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 while utilizing fewer bits, and includes a sensor device that can restore these values accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If N-bit internal digital values are transmitted directly from pen to sensor device, then measurement precision is maintained, but communication resource consumption increases
Solution Approach 1:
The patent changes the parameter of data representation from absolute N-bit values to relative M-bit differences. By transmitting the difference between consecutive writing pressure values instead of full N-bit values, the patent reduces communication resource consumption while maintaining the ability to reconstruct precise absolute values at the receiver through cumulative addition.
Solution Approach 2:
The patent creates a simplified copy of the original data by transmitting relative differences rather than complete absolute values. This copy contains sufficient information to reconstruct the original N-bit precision values at the sensor device through cumulative calculation, thereby reducing communication overhead while preserving measurement precision.
2Loss of time
If data transmission is performed during display's non-driving period, then communication time is reduced, but communication resource availability decreases
Solution Approach 1:
The patent changes the data format parameter to use relative differences instead of absolute values, which reduces the number of bits required for transmission. This compression allows complete transmission of writing pressure data within the limited non-driving period even when multiple pens are present, thereby improving communication resource availability without extending transmission time.
3Adaptability or versatility
If multi-pen system is implemented, then system versatility increases, but communication resource insufficiency worsens
Solution Approach 1:
The patent applies parameter change by encoding writing pressure values as relative differences (M-bit) rather than absolute values (N-bit). This reduction in data size per pen enables the system to support multiple pens simultaneously within the same communication time window, thereby resolving the resource insufficiency problem while maintaining multi-pen versatility.
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.