Downsampling Display Images for Crosstalk Compensation
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Solution Overview
Problem
Touch sensitive devices face challenges in accurately recognizing and interpreting touch and hover events due to crosstalk between the display and touch sensor panels, leading to false or erroneous readings.
Innovation Solution
Incorporating a downsampler and a crosstalk compensator circuitry that downsampled display images to estimate and compensate for crosstalk, improving the accuracy of touch and hover sensing by applying this information to touch images captured by the touch sensor panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display image is processed at full resolution for crosstalk compensation, then the compensation accuracy is improved, but the processing complexity and data transmission burden increase
Solution Approach 1:
The patent segments the display image into a reduced set of representative pixels or regions that capture the essential crosstalk characteristics. Instead of processing every pixel at full resolution, the system selects key sampling points across the display image to estimate crosstalk patterns, thereby reducing computational complexity while maintaining compensation accuracy.
Solution Approach 2:
The patent creates a simplified representation or copy of the display image that retains the essential crosstalk information. This downsampled or representative version of the display image is then used for crosstalk estimation and compensation, avoiding the need to process the full-resolution display image while preserving the necessary compensation data.
2Device complexity
If the display image is downsampled to reduce processing load, then the processing complexity is reduced, but the crosstalk estimation accuracy may deteriorate
Solution Approach 1:
The patent applies different processing strategies to different regions of the display image based on their local crosstalk characteristics. High-resolution processing is applied to regions with significant crosstalk potential (such as areas close to the touch sensor), while lower resolution is applied to regions with minimal crosstalk impact, optimizing the balance between processing complexity and estimation accuracy.
Solution Approach 2:
The patent performs preliminary analysis of the display image to identify regions and patterns that are most relevant for crosstalk compensation. This preliminary processing guides subsequent crosstalk estimation, ensuring that computational resources are focused on the most critical areas while maintaining overall accuracy.
3Measurement precision
If more detailed touch image processing is applied, then the touch event accuracy is improved, but the processing time and computational resources increase
Solution Approach 1:
The patent uses feedback from the crosstalk compensation process to improve touch event detection. By continuously refining the compensation model based on observed touch patterns and crosstalk characteristics, the system achieves higher touch event accuracy without requiring proportionally increased processing time for each individual touch event.
Data Source
AI summary
A touch sensitive device having circuitry to compensate for crosstalk from the device display to the device touch sensor panel is disclosed. The crosstalk compensation circuitry can include a downsampler and a crosstalk compensator. The downsampler can downsample a display image to a manageable size for transmission and processing and can then send the downsampled image to the crosstalk compensator so as to provide information about the display operation that can be used to estimate the expected amount of crosstalk caused by the display. The crosstalk compensator can estimate the amount of crosstalk based on the downsampled image and can then compensate a touch image captured by the touch sensor panel for the estimated amount, the touch image being indicative of a touch or hover event at the panel.