Dynamic Emission Control Waveform for Proximity Sensing
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Solution Overview
Problem
Current electronic devices with proximity sensing functions face challenges in efficiently detecting objects at a distance due to noise interference from the display layer, which affects the accuracy and sensitivity of proximity sensing capabilities.
Innovation Solution
The electronic device incorporates a sensor layer that operates in a proximity sensing mode with a distinct emission control signal waveform and frequency, different from its touch sensing mode, to reduce noise interference and enhance detection sensitivity by adjusting the emission control signal and sampling intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor layer operates in a single sensing mode with fixed emission control signal, then the device structure remains simple, but proximity sensing accuracy deteriorates due to noise interference from the display layer
Solution Approach 1:
The emission control signal waveform is made dynamic by switching between first and second waveforms based on the sensing mode. In touch sensing mode, the first waveform is used, while in proximity sensing mode, the second waveform is used. This dynamic adaptation allows the system to optimize performance for each specific sensing task, reducing noise interference during proximity detection while maintaining effective touch sensing capability.
Solution Approach 2:
The patent changes key parameters of the emission control signal including waveform shape, frequency, and activation interval length. By adjusting these parameters according to the sensing mode, the system achieves better noise filtering for proximity sensing while maintaining compatibility with the display driver's operation requirements.
2Measurement precision
If the emission control signal activation interval is extended to improve proximity sensing, then detection sensitivity increases, but display refresh performance deteriorates
Solution Approach 1:
The patent employs periodic activation intervals within the emission control signal where the signal is activated only during specific periods necessary for sensing, rather than continuously. This periodic action allows the system to gather sufficient sensing data for high detection sensitivity while leaving other periods available for normal display refresh operations, thus maintaining display performance.
Solution Approach 2:
The length of activation intervals is made dynamic, being adjusted based on the current sensing mode. During proximity sensing mode, the activation interval is extended to improve detection sensitivity, while during normal display operation, the interval is reduced to maintain high refresh performance. This dynamic adjustment resolves the contradiction between sensing accuracy and display performance.
3Measurement precision
If separate proximity sensors are added to eliminate noise interference, then sensing accuracy improves, but device complexity and fabrication cost increase
Solution Approach 1:
The sensor layer is designed to perform multiple functions: both touch sensing and proximity sensing. By making the sensor layer universal and capable of operating in different modes with different emission control signal waveforms, the patent eliminates the need for separate dedicated proximity sensors, thereby maintaining device simplicity while achieving accurate proximity detection through waveform-based noise interference reduction.
Data Source
AI summary
An electronic device is disclosed that includes a display layer, a display driver, a sensor layer on the display layer, and a sensor driver that drives the sensor layer. The display layer includes a scan line, a data line, an emission control line. The display driver drives the display layer and provides signals to the scan, data, and emission control lines. The sensor layer operates in a first sensing mode driven at a first sensing frequency or in a second sensing mode driven at a second sensing frequency different from the first sensing frequency. When the sensor layer operates in the first sensing mode, the display driver outputs a first emission control signal to the emission control line. When the sensor layer operates in the second sensing mode, the display driver provides the emission control line with a second emission control signal having a second waveform that is different from a first waveform of the first emission control signal.