Negative Pixel Compensation in Touch Sensor Panels
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Solution Overview
Problem
Touch sensor panels experience erroneous or distorted touch output values due to poor grounding of users or objects, particularly exacerbated by multiple simultaneous touches, leading to a negative pixel effect.
Innovation Solution
The touch sensor panel reconstructs the captured touch image to eliminate negative pixel values and computes a composite image to replace the original, thereby compensating for the negative pixel effect, improving detection accuracy and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple simultaneous touch events are detected on the panel, then touch functionality is enhanced, but erroneous or distorted touch output values occur due to poor grounding
Solution Approach 1:
The system performs multiple measurements and uses feedback from previous measurements to compensate for grounding errors. The compensation process uses the relationship between first and second measurements to calculate corrected touch values, eliminating negative pixel effects and improving measurement accuracy in multi-touch scenarios
Solution Approach 2:
The system changes measurement parameters by taking multiple measurements with different settings and combining them through compensation algorithms. By varying measurement conditions and using mathematical compensation, the system extracts accurate touch information despite poor grounding conditions
2Measurement precision
If repeated measurements are performed to improve accuracy, then touch detection precision increases, but power consumption increases
Solution Approach 1:
The system performs a limited number of measurements (first and second measurements) rather than continuous measurements, using just enough sampling to achieve compensation. This partial action approach provides sufficient accuracy improvement without excessive power consumption
3Measurement precision
If compensation processing is performed to eliminate negative pixel values, then touch detection accuracy improves, but processing time increases
Solution Approach 1:
The system performs compensation processing in advance by calculating correction factors from the relationship between multiple measurements before final touch detection. This preliminary compensation prepares the data structure for rapid final detection, reducing real-time processing time
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 enables faster, more accurate touch detection and power savings by adapting to various grounding conditions, reducing the need for repeated measurements under poor grounding conditions.
Implementation Method 1
the touch sensor panel can include an array of pixels formed at intersections of row electrodes and column electrodes... each pixel can have an associated mutual capacitance when the drive line forming the pixel is stimulated with a stimulation signal
Data Source
AI summary
Negative pixel compensation in a touch sensor panel is disclosed. The panel can compensate for a negative pixel effect in touch signal outputs due to poor grounding of an object touching the panel. To do so, the panel can reconstruct a captured touch image to remove negative pixel values indicative of the negative pixel effect and compute a composite image from the captured image and the reconstructed image to replace the captured image. In addition or alternatively, the panel can reconstruct a captured touch image to remove negative pixel values indicative of the negative pixel effect and replace the captured image with the reconstructed image.