Digitizer-Free Display Sensing for Reliable Pen Coordinates
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Solution Overview
Problem
Existing multimedia electronic devices face challenges in accurately determining coordinate inputs, particularly when using a pen for fine touch input, due to limitations in sensor technology.
Innovation Solution
The electronic device incorporates a sensor layer with defined sensing areas and a sensor driving unit that calculates coordinates based on sensing signals, utilizing lookup tables and peak values to enhance coordinate reliability, and interpolates coordinates when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a digitizer is used to improve coordinate detection accuracy, then measurement precision is improved, but device thickness and weight increase
Solution Approach 1:
The patent extracts and eliminates the digitizer component from the display structure, replacing it with a sensor layer integrated directly into the display panel. This removal of the separate digitizer layer directly reduces device weight while maintaining coordinate detection functionality through the integrated sensing mechanism.
Solution Approach 2:
The patent merges the sensing function previously performed by a separate digitizer layer with the display panel structure itself. The sensor layer is integrated within the display panel, combining display and sensing functions into a single unified structure, thereby reducing overall device thickness and weight while preserving measurement precision.
2Measurement precision
If a digitizer is used to improve coordinate detection accuracy, then measurement precision is improved, but device thickness increases
Solution Approach 1:
The patent removes the separate digitizer layer from the device structure, extracting its sensing function and integrating it directly into the display panel. This elimination of the standalone digitizer component directly reduces device thickness while maintaining coordinate detection accuracy through the integrated sensor layer.
Solution Approach 2:
The sensing function is merged with the display panel structure, creating an integrated thin-film sensor layer within the display assembly. This consolidation eliminates the need for additional thick digitizer layers, thereby reducing overall device thickness while preserving measurement precision.
3Measurement precision
If lookup tables and peak value calculations are used to improve coordinate reliability, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent pre-calculates and stores coordinate mapping data in lookup tables during the device manufacturing or initialization phase. By preparing these reference tables in advance, the system avoids complex real-time calculations during operation, thereby improving coordinate reliability while minimizing the computational complexity and processing burden during actual use.
Solution Approach 2:
The patent uses lookup tables that store pre-computed coordinate relationships as reference copies. Instead of performing complex coordinate transformations in real-time, the system retrieves pre-calculated coordinate data from the lookup tables, simplifying the computational process while maintaining high coordinate reliability and accuracy.
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
Improves coordinate reliability and accuracy in detecting pen inputs, eliminating the need for a digitizer and reducing device thickness and weight.
Implementation Method 1
the sensing signal may be generated based on a differential signal that is sensed differentially with channels, which are adjacent to each other, or channels, which are spaced apart from each other, of the sensor layer based on current induced from the input device
Data Source
AI summary
An electronic device includes: a display panel; a sensor layer on the display panel, the sensor layer having a sensing area corresponding to a display area of the display panel, the sensing area comprising a first area and a second area surrounding the first area; and a sensor driver configured to: drive the sensor layer; receive a sensing signal corresponding to an input device, the sensing signal comprising a first peak value, a second peak value, and a third peak value; and calculate coordinates of the input device at the second area based on the second peak value and the third peak value.