Electrostatic Protection Structure for X-ray Image Sensor Pixel Unit
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Solution Overview
Problem
Existing electrostatic protection structures for X-ray image sensors are not effective in preventing electrostatic damage to pixel units during the manufacturing process, as static electricity often causes breakdown in the data line rather than being diverted through the protection capacitor.
Innovation Solution
The electrostatic protection structure includes a data line with a signal transmission path and an electrostatic diverting path, where the impedance of the signal transmission path is greater than that of the electrostatic diverting path, ensuring static electricity is diverted out through the diverting path, and an electrostatic protection capacitor is connected to a constant potential to further reduce impedance and enhance protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic protection capacitor is provided at a branch of the data line, then the pixel protection electrode can divert static electricity, but the static electricity causes breakdown in the data line rather than being diverted through the protection capacitor
Solution Approach 1:
The patent applies local quality by creating different impedance characteristics in different sections of the data line. The signal transmission path has higher impedance while the electrostatic diverting path has lower impedance, ensuring that static electricity preferentially flows through the diverting path while signal transmission remains unaffected. This localized impedance differentiation resolves the contradiction by making the data line structure itself selective to different types of electrical signals.
Solution Approach 2:
The patent segments the data line into two distinct functional paths: a signal transmission path and an electrostatic diverting path. This segmentation allows each path to be optimized for its specific function - the signal path maintains appropriate impedance for signal integrity while the diverting path provides a low-impedance route for static electricity, resolving the contradiction between signal transmission and electrostatic protection.
2Reliability
If the impedance of the signal transmission path is made greater than that of the electrostatic diverting path, then static electricity is effectively diverted, but the data line structure becomes more complex
Solution Approach 1:
The patent achieves multi-functionality by making the data line serve dual purposes: signal transmission and electrostatic protection. The same data line structure simultaneously transmits pixel signals and diverts static electricity by incorporating both a signal transmission path and an electrostatic diverting path with different impedance characteristics. This eliminates the need for separate protection circuits, resolving the contradiction between protection effectiveness and structural complexity.
Solution Approach 2:
The patent merges the electrostatic protection function with the existing data line structure by integrating the electrostatic diverting path into the data line itself. Rather than adding a separate protection circuit, the solution combines signal transmission and electrostatic diversion functions within a unified data line architecture, resolving the contradiction by achieving protection without increasing overall structural complexity.
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 design effectively diverts static electricity away from the pixel unit, preventing electrostatic damage and ensuring the normal operation of the X-ray image sensor by preferentially routing static discharge through the diverting path with lower impedance.
Implementation Method 1
static electricity is diverted out through the diverting path
Implementation Method 2
the impedance of the signal transmission path is greater than that of the electrostatic diverting path
Data Source
Figure 1a~1b
Figure 1c~2
Figure 3
AI summary
An electrostatic protection structure and an X-ray image sensor are provided. The electrostatic protection structure includes a data line which is adapted to transmit a pixel signal. The data line includes an electrostatic diverting path and a signal transmission path. One terminal of the signal transmission path is connected to a pixel unit and the other terminal of the signal transmission path is connected to a signal output terminal, to output a signal from the pixel unit. One terminal of the electrostatic diverting path is connected to a constant potential and the other terminal of the electrostatic diverting path is connected to the signal output terminal. The impedance of the signal transmission path is greater than the impedance of the electrostatic diverting path.