Touch Screen Display Noise Removal via Environmental Reference Updates
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Solution Overview
Problem
Touch screen display apparatuses using photo sensor arrays face challenges in accurately determining touch locations due to noise interference from external conditions such as low illumination and high temperatures, leading to erroneous touch detection and calculation errors.
Innovation Solution
The method involves a touch screen display apparatus with a photo sensor unit, a light emitting unit, and a touch detector that updates a noise determination reference based on detected temperature and illumination levels, allowing for noise removal during enable periods and accurate calculation of touch locations during enable periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If photo sensor array is used to detect touch location, then touch detection capability is improved, but noise interference from external conditions increases leading to detection errors
Solution Approach 1:
The system performs preliminary actions by detecting temperature and illumination levels before touch location calculation, and pre-calculates compensation values for noise interference. This allows the system to proactively adjust for environmental conditions that would otherwise cause detection errors, thereby maintaining measurement precision despite external noise factors.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring temperature and illumination conditions, comparing them against reference values, and dynamically adjusting the compensation applied to touch location calculations. This closed-loop feedback ensures that noise interference is constantly countered, maintaining accurate touch detection despite varying external conditions.
2Measurement precision
If noise removal processing is applied to sensing signals, then touch location calculation accuracy is improved, but processing time and complexity increase
Solution Approach 1:
The system performs noise compensation calculations in advance by pre-determining compensation values based on detected temperature and illumination levels. By preparing compensation data before actual touch location calculation is needed, the system reduces real-time processing requirements while maintaining high calculation accuracy.
Solution Approach 2:
The system creates simplified representations of noise patterns by generating reference compensation values that capture the essential characteristics of environmental interference. These copied noise characteristics are then applied to multiple touch detection scenarios, reducing the need for complex real-time analysis while maintaining accuracy.
3Measurement precision
If temperature and illumination detection are performed to update noise reference, then noise removal accuracy is improved, but device complexity increases
Solution Approach 1:
The system achieves multi-functionality by using the same sensor array and processing infrastructure for both primary touch detection and environmental condition monitoring. Temperature and illumination detection capabilities are integrated into the existing display and touch detection system, allowing noise reference updates without requiring entirely separate dedicated hardware systems.
Solution Approach 2:
The system performs self-service by utilizing its own existing sensors and processing resources to detect environmental conditions and generate noise compensation data. Rather than requiring entirely external monitoring systems, the display apparatus uses its inherent capabilities to autonomously update noise references, reducing overall system complexity.
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
This approach effectively removes noise from sensing signals, enhancing the accuracy of touch location calculation and reducing erroneous detections, even under varying environmental conditions.
Implementation Method 1
a photo sensor unit for capturing an image of the object
Implementation Method 2
a light emitting unit for realizing an image to be displayed
Data Source
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AI summary
A touch screen display apparatus includes a touch detector for detecting a touch by an object and for generating an input signal, a panel including photo sensor units for capturing an image of the object, and a plurality of light emitting units for realizing an image to be displayed, a signal converter for converting the input signal into an output signal having a plurality of enable periods and at least one disable period, an updating unit for updating a noise determination reference of a sensing signal provided from the photo sensor unit during the at least one disable period, and a noise remove for removing noise from the sensing signal is according to the updated noise determination reference during an enable period of the enable periods.