Touch Location Correction in Displays With Integrated Optical Areas
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Solution Overview
Problem
Existing display apparatuses face errors in determining touch location accuracy, particularly in areas where optical devices are integrated, due to variations in sensor capacitance and noise interference.
Innovation Solution
A display apparatus with defined first and second display areas, utilizing touch driving circuits to generate corrected touch values by applying correction coefficients based on reference touch values, and employing noise filters to enhance signal-to-noise ratios for accurate touch location determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical devices are integrated into the display area to expand functionality, then the versatility of the display apparatus is improved, but touch location detection accuracy deteriorates due to sensor capacitance variations and noise interference
Solution Approach 1:
The patent applies local quality by implementing different correction strategies for different display areas. The display area is divided into regions with optical devices and regions without, and separate correction coefficients are applied to each region based on their specific characteristics. This allows the system to maintain high touch detection accuracy in each local area while preserving the overall functionality of integrating optical devices into the display.
Solution Approach 2:
The patent changes parameters by introducing correction coefficients that adjust the touch sensor readings. These correction coefficients are determined based on reference touch values and are used to compensate for the capacitance variations and noise introduced by optical devices. By dynamically adjusting the touch values through parameter changes, the system maintains accurate touch location detection despite the presence of optical devices in the display area.
2Measurement precision
If correction coefficients are applied to sensor values to improve touch location accuracy, then measurement precision is improved, but device complexity increases due to additional correction processing
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction coefficients before actual touch detection occurs. The correction coefficients are determined based on reference touch values obtained during a calibration phase or manufacturing process. This preliminary preparation allows the correction processing during actual touch detection to be simplified to just multiplying the raw touch values by the pre-determined correction coefficients, reducing the complexity of real-time processing while maintaining high accuracy.
3Measurement precision
If noise filters are applied to sensing signals to improve signal-to-noise ratio, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent replaces complex mechanical or algorithmic noise filtering systems with a simpler mathematical correction approach. Instead of applying sophisticated noise filters that require extensive processing, the system uses pre-determined correction coefficients that encapsulate the noise characteristics. This substitution of the noise reduction mechanism with a coefficient-based correction system significantly reduces processing time while maintaining improved signal-to-noise ratio and touch detection accuracy.
Data Source
AI summary
A display apparatus includes: a substrate having a first display area and a second display area; and a touch driving circuit configured to: receive first sensing signals of first touch sensors on the first display area; receive second sensing signals of second touch sensors on the second display area; generate first touch values based on the first sensing signals; generate second touch values based on the second sensing signals; generate corrected touch values by correcting the second touch values; and determine a touch location based on the first touch values and the corrected touch values.