X-ray detector residual charge equalization via signal line conduction
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Solution Overview
Problem
X-ray detectors face issues with residual charges affecting image quality due to superimposed residual information from previous captures, which current digital image processing cannot fully correct.
Innovation Solution
The X-ray detector design includes a substrate with signal and scan lines, active devices, and a control circuit to establish and control electrical conduction between sensing units, allowing for the uniform adjustment of charge distribution and pixel correction to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital image processing is used to correct residual image, then image correction can be performed, but the correction effect is limited and image quality cannot be sufficiently improved
Solution Approach 1:
The patent applies preliminary action by establishing electrical conduction between adjacent signal lines before image capture to uniformly distribute residual charges across the sensor array. This pre-processing step equalizes the residual charge distribution at the hardware level before the actual imaging process, preventing non-uniform residual images from forming in the first place, thereby achieving better correction effects than post-capture digital processing alone
2Productivity
If residual charges remain in the photodiode, then the imaging process can be completed, but the obtained image is affected by residual image and image quality deteriorates
Solution Approach 1:
The patent converts the harmful residual charges into a beneficial uniform distribution pattern. By establishing electrical conduction between adjacent signal lines, the residual charges that would normally create non-uniform artifacts are instead redistributed uniformly across the sensor array. This transforms the harmful non-uniform residual image into a benign uniform background that can be easily removed through digital processing, thereby improving image quality while maintaining continuous imaging capability
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
This approach reduces the difference in residual charges across locations, leading to enhanced image quality by uniformly adjusting pixels and effectively addressing the residual image issue.
Implementation Method 1
X-rays are first incident on a scintillator layer on an upper surface of the X-ray sensor, which converts the incident X-rays into visible light
Implementation Method 2
The visible light activates a photodiode of the X-ray sensor to generate electrons
Data Source
AI summary
An X-ray detector includes a substrate, plural signal lines, plural scan lines, plural sensing units, and a first active device. The signal lines are disposed on the substrate. The scan lines are disposed on the substrate and intersecting with the signal lines. The sensing units are electrically connected to the signal lines and the scan lines. The first active device has a first terminal, a second terminal, and a control terminal configured to modulate a conduction between the first terminal and the second terminal. The first terminal of the first active device is connected to a first one of the signal lines, and the second terminal of the first active device is connected to a second one of the signal lines.