Image Detector Diode Protection Circuit for Static and Leak Current
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Solution Overview
Problem
Radiation image detecting devices face challenges in preventing electrostatic defects during substrate manufacturing and signal value fluctuations due to leak current during operation, particularly when using TFT active matrix substrates for FPDs.
Innovation Solution
The implementation of a substrate with plural accumulating portions connected to data lines via switching elements, featuring first and second diodes connected to protection lines to discharge static electricity and manage leak current, ensuring that electrostatic defects are prevented and signal value fluctuations are suppressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bidirectional diodes are used to protect data lines from static electricity during manufacturing, then electrostatic defects are prevented, but signal value fluctuations occur due to leak current during operation
Solution Approach 1:
The single bidirectional diode protection approach is segmented into separate unidirectional diodes for each direction (anode-to-cathode and cathode-to-anode), allowing independent control of protection functionality and signal integrity for each polarity
Solution Approach 2:
The harmful leak current component is extracted and directed away from the signal path by routing it through dedicated protection diodes to ground or reference potential, separating the protection function from the signal transmission path
2Device complexity
If a common line is used to connect all data lines via bidirectional diodes, then circuit protection is simplified, but leak current affects multiple data lines causing signal fluctuations
Solution Approach 1:
The common protection line approach is segmented by providing separate protection paths for each data line through individual diode connections to ground or reference potential, preventing cross-contamination of leak current between channels
Solution Approach 2:
Each data line receives localized protection tailored to its specific requirements, with diodes positioned and configured to protect individual lines without affecting neighboring signal integrity
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 configuration effectively prevents electrostatic defects during manufacturing and suppresses signal value fluctuations during operation by directing static electricity discharge and managing leak current through the use of diodes and protection lines, enhancing the reliability and accuracy of radiation image detection.
Implementation Method 1
plural first protection lines for protecting a circuit from excess voltage; plural first diodes whose anodes are connected to a portion of the plural first protection lines respectively, and whose cathodes are connected to the plural data lines respectively
Implementation Method 2
plural first diodes whose anodes are connected to a portion of the plural first protection lines respectively, and whose cathodes are connected to the plural data lines respectively; plural second diodes whose cathodes are connected to another portion of the plural first protection lines respectively, and whose anodes are connected to the plural data lines respectively
Data Source
AI summary
An image detecting device includes a substrate including plural accumulating portions, plural data lines, plural first protection lines, plural first diodes, and plural second diodes. The plural accumulating portions, due to the irradiation of incident electromagnetic waves expressing an image which is an object of detection, charges expressing the image are accumulated. In the plural data lines, the plural accumulating portions are respectively connected individually via switching elements. The plural first protection lines are for protecting a circuit from excess voltage. In the plural first diodes, anodes are connected to a portion of the plural first protection lines respectively, and cathodes are connected to the plural data lines respectively. In the plural of second diodes, cathodes are connected to another portion of the plural first protection lines respectively, and anodes are connected to the plural data lines respectively.