Touch Screen Background Signal Refreshing Method
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Solution Overview
Problem
High-resolution touch screens face increased memory requirements and computation time due to coordinate-dependent capacitance values, leading to reduced sensitivity and real-time performance, particularly when tracking continuous user input like drawing.
Innovation Solution
A refreshing method for background signals in touch sensing devices that defines a refreshing area based on positional information, an extension parameter, and a measuring breadth, allowing for efficient updating of background signals to improve tracking accuracy and reduce computation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch screen achieves higher resolution, then the measurement precision is improved, but the memory space requirement increases
Solution Approach 1:
The patent divides the sensing area into multiple zones based on touch density and activity. Instead of maintaining high-resolution background signals for the entire screen, only actively touched regions are refreshed with full precision, while inactive regions use lower precision or skipped updates, reducing memory requirements while maintaining measurement precision where needed
Solution Approach 2:
The patent applies different background signal refresh strategies to different regions of the touch screen based on local touch activity. High-resolution refresh is applied only to areas with recent touch events, while other areas use reduced refresh rates or lower precision, optimizing the balance between measurement precision and memory usage
2Reliability
If the predetermined capacitance values are updated continuously, then the reliability is improved, but the computation time increases
Solution Approach 1:
The patent implements periodic background signal refresh with variable intervals. Instead of continuous uniform updates, the system refreshes background signals at different periodic intervals based on touch activity - frequently touched areas are refreshed more often, while inactive areas use longer intervals, maintaining sensing accuracy while reducing overall computation time
Solution Approach 2:
The patent performs preliminary determination of touch activity patterns to predict which regions will need background signal refresh. By anticipating active areas based on recent touch history and motion patterns, the system prepares refresh operations in advance for only those regions, reducing unnecessary computation while maintaining reliability
3Productivity
If the sensing system updates all background signals at high frequency, then the productivity is improved, but the loss of time increases
Solution Approach 1:
The patent segments the sensing area into active and inactive regions, refreshing background signals only in active regions where touch events are detected. This selective refresh approach maintains high productivity for drawing tracking in active areas while reducing the overall update cycle time by skipping inactive regions
Solution Approach 2:
The patent applies partial action by updating background signals only for portions of the sensing area that contain touch events or are predicted to contain events. Instead of uniformly updating the entire screen, the system performs excessive updates only where necessary, maintaining tracking speed while reducing total update time
Data Source
AI summary
A refreshing method of background signal for a device includes: obtaining one or more touched coordinate pair; obtaining a refreshing area according to the touched coordinate pair, an extension parameter, and a measuring breadth; and refreshing a background signal of the refreshing area. The refreshing area is determined by extending a distance of measuring breadth from a center point corresponding to the touched coordinate pair along the orthogonal directions. Accordingly, the refreshing area is sufficient to address the situation where the user draws a line continuously from the touched coordinate pair if the measuring breadth is determined properly. Therefore, the method may satisfy the needs of the user and reduce the refreshing time of an active area of the device. In addition, a device for applying the method is provided as well.