Display Panel Sensing Noise Mitigation via Differential Methods
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Solution Overview
Problem
Electronic display panel sensing is hindered by common-mode noise, particularly in high-resolution displays with high pixel density, due to factors like electromagnetic interference from nearby components, which existing single-ended sensing methods fail to adequately address.
Innovation Solution
The implementation of differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), and programmable capacitor matching to mitigate noise in display panel sensing, allowing for more precise image compensation by subtracting common-mode and temporal noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-ended display panel sensing is used, then device complexity is reduced, but measurement precision deteriorates due to substantial noise detection in high pixel density displays
Solution Approach 1:
The sensing method is segmented into multiple phases: a first sensing phase that captures both signal and common-mode noise, and a second sensing phase that captures primarily common-mode noise. By separating the measurement into distinct temporal segments, the method enables subsequent subtraction of the noise component from the signal component, thereby improving measurement precision without requiring fundamentally complex hardware architecture.
Solution Approach 2:
The system dynamically changes the sensing parameter by switching between different sensing phases with different reference conditions. During the first phase, the sense amplifier measures the pixel signal against a reference; during the second phase, it measures common-mode noise against the same reference. This parameter change in the sensing approach allows extraction of the pure signal by mathematical combination of the two measurements.
2Manufacturing precision
If display panel sensing is performed in high pixel density displays, then image fidelity is improved, but noise interference increases due to electromagnetic interference from nearby components
Solution Approach 1:
The method extracts the common-mode noise component as a separate measurable quantity through the second sensing phase. By isolating and measuring the electromagnetic interference from nearby components independently, the system can then remove this harmful factor from the original signal measurement, thereby improving image fidelity in high pixel density displays where such interference is more pronounced.
Solution Approach 2:
The method converts the harmful electromagnetic interference into a useful measurement by deliberately measuring the common-mode noise in the second phase. This previously harmful signal becomes valuable information that enables noise cancellation, transforming the interference problem into a solution that improves sensing accuracy in high-density display environments.
3Measurement precision
If differential sensing is implemented, then noise mitigation is improved, but device complexity increases compared to single-ended sensing
Solution Approach 1:
The sense amplifier is designed to perform multiple functions: it can operate in a first mode for standard signal sensing and in a second mode for common-mode noise measurement. By making the sensing system multi-functional rather than requiring separate dedicated circuits for signal and noise measurement, the implementation achieves differential sensing capabilities without proportionally increasing device complexity.
Solution Approach 2:
The system performs preliminary noise measurement in a second phase before final signal processing. By预先 measuring the common-mode noise level and storing it for later subtraction, the method enables effective noise mitigation without requiring complex real-time processing during the primary sensing operation, thereby managing device complexity while improving measurement precision.
Data Source
AI summary
Systems and methods are provided for differential sensing (DS), difference-differential sensing (DDS), correlated double sampling (CDS), and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors and an electronic display. The one or more processors may generate image data and adjust the image data based at least in part on display sensing feedback. The electronic display may employ sensing circuitry that obtains the display sensing feedback at least in part by applying test data to a pixel of a column of an active area of the display and differentially senses an electrical value of the pixel in comparison to a reference signal from a different column. This reference signal may provide a common mode noise reference, which is removed by the differential sensing and thereby enhances a quality of the sensed electrical value of the pixel.