X-Ray Detector Contact Pattern Layout for Photoconductor Adhesion
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Solution Overview
Problem
The difference in thermal expansion coefficients between the photoconductor layer and the substrate in X-ray detectors leads to detachment of the photoconductor layer due to temperature changes.
Innovation Solution
An X-ray detector design that includes a substrate with a defined display and non-display area, a first electrode in the display area, a photoconductor layer covering both areas, a second electrode on the photoconductor layer, and at least one contact pattern in the non-display area to increase the contact area between the photoconductor layer and the substrate, along with a sealing member to enhance adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the photoconductor layer is made thin to improve X-ray detection efficiency, then the detection sensitivity is improved, but the adhesion to the substrate deteriorates due to thermal expansion differences
Solution Approach 1:
The patent introduces contact patterns that segment the photoconductor layer into multiple regions with different adhesion characteristics. The contact patterns create localized high-adhesion zones that distribute the thermal stress, allowing the thin photoconductor layer to maintain both sensitivity and adhesion reliability.
Solution Approach 2:
The contact patterns act as intermediary structures between the photoconductor layer and the substrate. These patterns provide intermediate adhesion points that compensate for the thermal expansion coefficient mismatch, preventing direct stress concentration at the interface and thereby maintaining adhesion reliability while keeping the photoconductor layer thin.
2Reliability
If the photoconductor layer is made thick to improve adhesion, then the adhesion to the substrate is improved, but the X-ray detection efficiency deteriorates
Solution Approach 1:
The patent applies local quality by creating contact patterns with high adhesion characteristics in specific locations (the non-display area and peripheral regions) while keeping the central display area thin for optimal X-ray detection. This localized adhesion enhancement allows the photoconductor layer to be thin overall while maintaining sufficient adhesion through the strategically placed contact patterns.
3Reliability
If the contact area between photoconductor layer and substrate is increased to improve adhesion, then the adhesion reliability is improved, but the device complexity increases due to additional contact patterns
Solution Approach 1:
The patent merges the contact patterns with the existing electrode structures and substrate design. The contact patterns are integrated into the non-display area and peripheral regions, combining multiple functions (adhesion enhancement, electrical contact, and structural support) into a single design element, thereby reducing overall device complexity while improving adhesion reliability.
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 increased contact area between the photoconductor layer and the substrate, combined with the sealing member, significantly enhances the adhesion of the photoconductor layer, thereby preventing detachment and improving the reliability of the X-ray detector.
Implementation Method 1
In direct conversion, on the other hand, a photoconductor that absorbs X-rays and directly creates electrical signals is used
Data Source
AI summary
Proposed is an X-ray detector including a substrate with a defined display area and a non-display area around the display area, a first electrode provided in the display area on the substrate, a photoconductor layer located on the first electrode and provided in the display area and the non-display area, a second electrode provided on the photoconductor layer, and at least one contact pattern provided in the non-display area and configured to surround the display area, wherein the photoconductor layer is in contact with the at least one contact pattern located therebelow.