Electronic Device Privacy Layer Timing for Touch Noise Control
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Solution Overview
Problem
Existing display devices with privacy functions generate noise signals during privacy layer switching, interfering with touch sensing operations due to their stack design, particularly affecting the scanning interval of the sensing layer.
Innovation Solution
The electronic device incorporates a first privacy layer on the display panel receiving a first driving signal, a sensing layer receiving a sensing driving signal with a delayed start time, and optionally a second privacy layer with a synchronized driving signal, along with a sensing driving circuit that selects a frequency band with lower noise to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the privacy layer is placed closer to the sensing layer in the stack design, then the privacy function is achieved, but noise signals are generated during privacy layer switching that interfere with touch sensing operations
Solution Approach 1:
The patent implements periodic action by dividing the driving signals into distinct time intervals: the privacy layer is driven during a first time interval while the sensing layer is driven during a second time interval that does not overlap with the first interval. This periodic, non-overlapping driving scheme eliminates noise interference during sensing operations while maintaining privacy functionality.
2Ease of operation
If the privacy layer is switched during operation, then privacy control is achieved, but noise signals are generated that affect touch sensing operation and cause false alarm points
Solution Approach 1:
The patent applies periodic action by implementing non-overlapping time intervals for privacy layer driving and sensing layer driving. The privacy layer receives driving signals during a first time interval, while the sensing layer receives driving signals during a second time interval that does not overlap with the first interval, thereby eliminating noise interference and false alarm points during touch sensing operations.
Solution Approach 2:
The patent implements preliminary action by completing all privacy layer switching operations and establishing the privacy state before initiating the sensing layer driving signals. This ensures that the privacy layer is already in its desired state and will not generate noise during the sensing operation, thereby preventing false alarm points.
3Productivity
If the sensing layer scans during the same interval when the privacy layer is switched, then touch sensing operation is performed, but noise signals from the privacy layer cause signal errors and false alarm points
Solution Approach 1:
The patent implements periodic action by establishing non-overlapping time intervals for privacy layer driving and sensing layer driving. The first time interval is dedicated to privacy layer operations, while the second time interval is dedicated to sensing layer operations, ensuring that noise signals from privacy layer switching do not interfere with touch sensing signal accuracy.
Data Source
AI summary
An electronic device is provided. The electronic device includes a display panel, a first privacy layer, and a sensing layer. The first privacy layer is disposed on the display panel and receives a first driving signal. The sensing layer is disposed on the first privacy layer and receives a sensing driving signal. A starting time of the sensing driving signal is later than a starting time of the first driving signal.