Sensing Module Pixel Leakage Current Detection and Deactivation
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Solution Overview
Problem
Vital sign measuring devices face reduced sensing accuracy due to leakage currents exceeding a threshold value in their pixel arrays, which also increase power consumption.
Innovation Solution
A sensing module that includes a light source, unit pixels connected to row and column lines, leakage current detectors, and a pixel driving circuit to deactivate unit pixels or pixel groups with leakage currents greater than a threshold, thereby improving accuracy and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all unit pixels in the pixel array are kept active, then the sensing coverage and signal strength are improved, but leakage current increases causing reduced sensing accuracy and increased power consumption
Solution Approach 1:
The pixel array is divided into multiple pixel groups, each with independent control capability. This segmentation allows selective activation of only those pixel groups that do not exhibit excessive leakage current, thereby reducing overall power consumption while maintaining sensing accuracy in healthy regions.
Solution Approach 2:
Different control strategies are applied to different regions of the pixel array based on their leakage current characteristics. Healthy pixel groups are activated for sensing, while faulty pixel groups with excessive leakage are deactivated, creating local quality differentiation across the array.
2Measurement precision
If unit pixels with leakage current are deactivated, then sensing accuracy and power consumption are improved, but the number of active sensing elements is reduced
Solution Approach 1:
By segmenting the pixel array into multiple independently controllable pixel groups, the system can deactivate only the faulty groups while keeping healthy groups active, thereby maintaining overall sensing coverage despite removing defective elements.
Solution Approach 2:
The system dynamically changes the operational state (active/inactive) of pixel groups based on measured leakage current parameters. This parameter-based control allows the system to adaptively optimize sensing accuracy by excluding faulty pixels while preserving coverage from healthy pixels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively deactivates faulty pixels to enhance sensing accuracy and reduce power consumption in vital sign measuring devices by identifying and isolating pixels with excessive leakage currents.
Implementation Method 1
a light source that outputs an optical signal; a plurality of unit pixels that are connected to a plurality of row lines and a plurality of column lines, and that sense the optical signal to generate a pixel signal
Implementation Method 2
a leakage current detector that compares an amplitude of the pixel signal generated by the plurality of unit pixels with a first reference voltage, in a state in which the light source is deactivated, to detect a unit pixel, among the plurality of unit pixels, in which a leakage current equal to or greater than a threshold value is generated
Data Source
AI summary
A sensing module is provided. The sensing module includes a light source, unit pixels, a leakage current detector, and a pixel driving circuit. The light source outputs an optical signal. The unit pixels are connected to row lines and column lines, and sense the optical signal to generate a pixel signal. The leakage current detector compares an amplitude of the pixel signal generated by the unit pixels with a first reference voltage, in a state in which the light source is deactivated, to detect a unit pixel, among the unit pixels, in which a leakage current equal to or greater than a threshold value is generated. The pixel driving circuit deactivates the detected unit pixel in a state in which the light source is activated.