Variable Jitter Filter for Touch Sensor Stability
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Solution Overview
Problem
Touch sensors in display devices often experience jitter phenomena due to external noise, leading to random detection of touch points, which existing methods struggle to effectively filter out.
Innovation Solution
A touch sensing method and display device that includes a jitter filter with a variable range, determined by a signal processor and application processor, to remove jitter components from touch point coordinates, using a jitter removal unit that adjusts filter size based on user interface and touch input characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed range jitter filter is used to remove jitter components, then jitter phenomenon is reduced, but the system cannot adapt to different user interfaces and touch input characteristics
Solution Approach 1:
The jitter filter range is made dynamically adjustable based on user interface type and touch input characteristics. The signal processor varies the filter range according to the specific application scenario, transforming a static filtering system into an adaptive one that optimizes jitter removal for different contexts while maintaining responsiveness.
Solution Approach 2:
The filter range parameter is changed based on the type of user interface and touch input characteristics. By modifying the filter range parameter dynamically, the system achieves optimal jitter removal performance for different applications without requiring multiple fixed filter systems.
2Reliability
If a larger jitter filter range is used, then jitter removal effectiveness is improved, but touch input responsiveness and accuracy may be reduced
Solution Approach 1:
The filter range parameter is dynamically adjusted based on touch input characteristics and user interface type. This allows the system to optimize the balance between jitter removal effectiveness and touch point detection accuracy for different scenarios, applying stronger filtering when needed and weaker filtering when responsiveness is prioritized.
Data Source
AI summary
A display device includes: a display panel; a sensor unit on the display panel; a touch driver including a signal processor configured to output a final touch point coordinate using a touch sensing signal received from the sensor unit; and an application processor configured to provide filter size information to the touch driver, wherein the signal processor includes a jitter remover configured to receive a current touch point coordinate from a coordinate calculator and to output the final touch point coordinate from which a jitter component is removed by filtering with a jitter filter, and wherein the jitter remover includes a filter size determiner configured to vary a range of the jitter filter in response to the filter size information.