Active Pen IC Pad Permutation for Circuit Area Reduction
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Solution Overview
Problem
Conventional active pen ICs require a large number of pads to maintain resolution with increasing mobile device sizes, occupying valuable circuit area.
Innovation Solution
An active pen IC with a reduced number of pads utilizes a permuting unit to reorder and rearrange signal reception, allowing fewer pads to effectively process the same number of signals through software and hardware combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution or size of the mobile device is increased, then the signal reception capability is improved, but the amount of pads required increases, occupying valuable circuit area
Solution Approach 1:
The pad reception process is segmented into multiple phases where a single pad receives different signals at different time intervals. Instead of requiring multiple pads simultaneously, the system divides the reception timeline into segments, allowing one pad to handle multiple signal reception tasks sequentially through the permuting unit's reordering capability.
Solution Approach 2:
The patent introduces a time dimension to the pad reception system. By permuting the order in which pads receive signals across different time intervals, the system effectively adds a temporal dimension to the spatial pad arrangement, allowing fewer pads to handle more signal reception tasks than would be possible in a static spatial configuration.
2Measurement precision
If the amount of pads is increased to maintain resolution, then the signal reception accuracy is improved, but the device complexity and circuit area increase
Solution Approach 1:
Each pad is designed to perform multiple functions by receiving different signals at different time intervals. The permuting unit enables pads to be reassigned to different signal reception roles dynamically, making each pad a universal receiver that can handle various signal types and positions throughout the reception sequence, thereby reducing the total number of pads needed.
Solution Approach 2:
The system transitions from a static pad assignment model to a dynamic one where pad functions change over time. The permuting unit continuously reorders which pad receives which signal based on the current time interval, creating a dynamic reception pattern that maintains high signal reception accuracy while using fewer pads than a static configuration would require.
Data Source
AI summary
An active pen IC includes a plurality of pads coupled to receive a plurality of receive (RX) signals induced from a mobile device, the received RX signals constituting an original group of RX signals. The active pen IC also includes a permuting unit configured to permute the pads such that the received RX signals corresponding to the permuted pads constitute a generated group of RX signals.