Pen Input Coordinate Compensation via Lookup Tables
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Solution Overview
Problem
Current portable terminal systems using EMR pens face limitations in accurately extracting pen input coordinates due to user characteristics, pen angle, and touch panel location, leading to reduced accuracy, especially in peripheral areas with weaker signal strength.
Innovation Solution
An input apparatus and method that utilize a touch panel, memory with lookup tables, and a controller to detect pen input coordinates and compensate for errors based on user characteristics and touch panel characteristics, improving accuracy by reflecting compensation data from the lookup tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If basic interpolation algorithm is used to extract pen input coordinate, then the extraction process is simple and fast, but the coordinate accuracy is insufficient due to user characteristics and pen angle variations
Solution Approach 1:
The patent pre-calculates and stores compensation data in lookup tables during system initialization or calibration phase. These lookup tables contain correction values for different pen angles and touch positions, which are then applied during normal operation to compensate for coordinate extraction errors without requiring complex real-time calculations
Solution Approach 2:
The patent adjusts the coordinate extraction parameters dynamically based on detected pen angle and touch position. By changing the compensation parameters according to the current input conditions (pen angle, touch location), the system achieves high accuracy without requiring a completely complex algorithm for every possible scenario
2Measurement precision
If signal strength is used for coordinate extraction, then the center area of the touch panel achieves high accuracy, but the peripheral area suffers from weak signal strength resulting in lower accuracy
Solution Approach 1:
The patent applies different compensation strategies to different regions of the touch panel. By dividing the touch panel into multiple areas (center and peripheral zones) and applying region-specific compensation parameters from the lookup tables, the system addresses the weak signal strength issue in peripheral areas without affecting the already accurate center area performance
Solution Approach 2:
The patent introduces compensation data as an intermediary element between the raw signal and the final coordinate output. This compensation data acts as a mediator that corrects the distortion caused by weak signal strength in peripheral areas, translating the unreliable raw signals into accurate coordinate information
3Measurement precision
If coordinate extraction is performed without considering user characteristics, then the processing is fast and simple, but the extracted coordinate position varies according to user habits and pen usage patterns
Solution Approach 1:
The patent performs user characteristic analysis and compensation parameter determination in advance, either during initial calibration or by pre-configuring default compensation values for different user types (e.g., left-handed vs. right-handed users). This preliminary action eliminates the need for complex real-time user adaptation during normal input operations
Solution Approach 2:
The system automatically determines and applies appropriate compensation parameters based on detected input characteristics without requiring manual user configuration. The system self-adapts to user habits by analyzing input patterns and selecting or calculating the most suitable compensation data from available lookup tables
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of pen input coordinates by considering user-specific and touch panel-specific factors, resulting in improved precision and user convenience by compensating for errors in both central and peripheral areas of the touch panel.
Implementation Method 1
the pen may be an electric pen, such as an Electro Magnetic Resonance (EMR) pen
Data Source
AI summary
An input apparatus of a portable terminal and an input method for compensating an input from a pen to increase the accuracy of the pen are provided. The input apparatus includes a touch panel configured to generate an input signal according to a pen touch, a memory configured to store at least one lookup table in which data for compensating an error of a pen input according to a user's pen usage characteristic is stored, a controller configured to detect an input coordinate of the pen touch on the touch panel and configured to extract compensation data from the lookup table corresponding to the input coordinate to compensate the error of the pen input, and a display unit configured to display a compensated pen input signal.