X-Ray Detector Conductive Sheet Sealing for Stable Biasing
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Solution Overview
Problem
Existing direct conversion X-ray detectors face challenges in stably sealing the sensor panel due to difficulties in coating an encapsulation film over transmission wires used for bias voltage application, which are prone to moisture infiltration and external noise interference.
Innovation Solution
An X-ray detector design incorporating a conductive sheet that surrounds the sensor panel and printed circuit board, connected to both the photoelectric conversion element and bias pad, with an encapsulation film covering the assembly to stabilize bias voltage application and prevent moisture ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission wires are used to connect the upper electrode to the bias pad, then the bias voltage can be applied to the photoelectric conversion element, but it becomes very difficult to coat an encapsulation film to protect the transmission wire or prevent moisture penetration
Solution Approach 1:
The patent extracts the transmission wire from the system and replaces it with a conductive sheet that is integrated into the encapsulation structure. The conductive sheet is formed on the rear surface of the sensor panel and extends to the bias pad, eliminating the need for separate transmission wires that would interfere with encapsulation film coating.
Solution Approach 2:
The conductive sheet merges the electrical connection function with the encapsulation structure. By forming the conductive sheet as part of the sensor panel assembly and having it extend to the bias pad, the patent combines the bias voltage transmission function with the encapsulated structure, allowing the encapsulation film to be coated over the entire assembly without exposing transmission wires.
2Reliability
If transmission wires are used for bias voltage application, then electrical connection is achieved, but the sensor panel cannot be stably sealed against moisture infiltration
Solution Approach 1:
The patent removes the transmission wire that creates the sealing problem and replaces it with a conductive sheet that can be fully encapsulated. The conductive sheet is formed on the sensor panel and extends to the bias pad, allowing the encapsulation film to completely cover the assembly and prevent moisture infiltration while maintaining electrical connection.
3Reliability
If transmission wires are used to connect electrodes, then bias voltage can be applied, but external noise can penetrate into the sensor panel
Solution Approach 1:
The patent extracts the transmission wire that provides noise pathways and replaces it with a conductive sheet integrated into the encapsulated structure. This integration, combined with the encapsulation film, creates a shielded structure that blocks external noise from penetrating into the sensor panel while maintaining bias voltage application.
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 conductive sheet ensures uniform bias voltage application, blocks external noise, and enhances the sealing of the sensor panel, while simplifying the encapsulation process by eliminating the need for transmission wires.
Implementation Method 1
a conductive sheet configured to cover the sensor panel and the printed circuit board and connect to the photoelectric conversion element and the bias pad
Implementation Method 2
direct conversion X-ray detectors use a photoconductor to convert X-rays directly into electrical signals without the need to convert the X-rays into visible light
Implementation Method 3
the encapsulation film can prevent the infiltration of moisture or foreign substances into the sensor panel and protect the sensor panel
Data Source
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AI summary
The present invention provides an X-ray detector comprising: a sensor panel which includes a photoelectric conversion device disposed on a substrate; a printed circuit board which is disposed at the rear surface of the sensor panel and includes a bias pad; and a conductive sheet which surrounds the sensor panel and the printed circuit board so as to be connected to the photoelectric conversion device and the bias pad.