Display Sensor Coordinate Calculation for Accurate Pen Input
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Solution Overview
Problem
Existing electronic devices face challenges in accurately determining input coordinates, 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
1Ease of operation
If a sensor layer is added to enable touch-based input, then user input capability is improved, but device thickness and weight increase
Solution Approach 1:
The patent merges the sensor layer with the display panel structure, integrating the touch sensing functionality into the existing display assembly. The sensor layer is positioned between the display panel and the touch-sensitive membrane, combining multiple functions (display, sensing, and touch input) into a unified structure, thereby enabling touch-based input without significantly increasing device weight
Solution Approach 2:
The patent employs thin film structures for the sensor layer and touch-sensitive membrane, using flexible shell technology to achieve touch input capability with minimal added mass. The thin film design allows the sensor layer to be integrated into the display panel without substantial weight increase, maintaining device portability while enabling enhanced user input capability
2Speed
If coordinate calculation uses simple peak value detection, then processing speed is improved, but coordinate accuracy deteriorates
Solution Approach 1:
The patent pre-calculates and stores lookup tables that map peak signal values to corresponding coordinates during device initialization or idle periods. During actual touch input, the system simply queries the pre-computed lookup table based on the detected peak value, eliminating the need for real-time complex coordinate calculation and thereby maintaining both high speed and high accuracy
Solution Approach 2:
The patent introduces lookup tables as an intermediary data structure between the simple peak value detection and the final coordinate determination. The lookup table serves as a pre-computed reference that translates raw peak signal values into accurate coordinate positions, allowing the system to achieve both rapid processing and precise measurement without performing complex real-time calculations
3Reliability
If sensor driving unit uses complex coordinate calculation methods, then coordinate reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the coordinate calculation process into distinct functional modules: peak value detection, lookup table query, coordinate interpolation (when necessary), and coordinate output. This segmentation allows each module to perform its specific function with optimized simplicity, improving overall reliability while keeping individual module complexity low and making the system easier to implement and maintain
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, weight, and flexibility issues.
Implementation Method 1
The sensing signal may be generated 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.