Touch Sensor Input Synchronization with Display Update Cycles
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Solution Overview
Problem
Interference from display devices negatively affects the accuracy of sensing devices in detecting input objects, leading to false or incorrect input reports.
Innovation Solution
The sensing device acquires data during non-display update periods to mitigate interference, using this data to correct sensing data collected during display updating periods, thereby ensuring accurate input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sensing device operates continuously during display updating periods, then the productivity of input detection is improved, but the measurement precision deteriorates due to display interference
Solution Approach 1:
The patent segments the sensing operation into two distinct modes: a first type of input sensing performed during non-display update periods when interference is minimal, and a second type of input sensing performed during display update periods when interference occurs. This segmentation allows the system to maintain continuous operation while accounting for interference effects in data processing
Solution Approach 2:
The patent implements a feedback mechanism where sensing data from both periods is processed with reference to display update timing information. The system uses feedback from the display control signals to adjust the processing of sensing data, compensating for interference effects and maintaining detection accuracy throughout continuous operation
2Measurement precision
If the sensing device operates during non-display update periods only, then the measurement precision is improved by avoiding display interference, but the productivity decreases due to reduced sensing time
Solution Approach 1:
The patent divides the sensing operation into two segments: high-precision sensing during non-display update periods and continuous sensing during display update periods. By segmenting the operation and processing data from both segments with appropriate reference to display timing, the system achieves both continuous operation and maintained accuracy
Solution Approach 2:
The patent performs preliminary high-precision sensing during non-display update periods before display updates occur. This preliminary action establishes a baseline of accurate data that can be used to compensate for and correct sensing data collected during subsequent display update periods, ensuring continuous accurate detection
Data Source
AI summary
A processing system configured to receive a first display control signal corresponding to a non-display update period of a display frame and a second display control signal corresponding to a display update period of the display frame. The processing system is further configured to acquire, based on receipt of the first display control signal, first resulting signals from sensor electrodes electrically connected to the sensor driver by operating the sensor electrodes for a first type of input sensing during a first period overlapping with at least a portion of the non-display update period. Further, the processing system is configured to acquire, based on receipt of the second display control signal, second resulting signals with the sensor electrodes by operating the sensor electrodes for a second type of input sensing during a second period overlapping with at least a portion of the display update period.