Digital X-ray Detector Thin-Film Transistor Array Substrate Moisture Protection
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Solution Overview
Problem
Digital X-ray detectors using thin-film transistors face issues with aging due to moisture and light incidence, leading to deterioration of electrical characteristics and reliability concerns.
Innovation Solution
A thin-film transistor array substrate with a layered protective structure, including a second protective layer of SiNx for moisture barrier and SiO2 or SiON for hydrogen dehydrogenation, and a third protective layer covering both transistors and PIN diodes, along with a planarization layer, to minimize moisture exposure and light incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thin-film transistor array substrate is used in a digital X-ray detector, then real-time imaging capability is achieved, but aging due to moisture and light incidence causes deterioration of electrical characteristics
Solution Approach 1:
The protective structure is divided into multiple functional layers: a first protective layer covering the thin-film transistor, a second protective layer covering the PIN diode, and a third protective layer covering both components. Each layer serves specific protective functions against moisture and light, resolving the contradiction by segmenting the protection mechanism across different components.
Solution Approach 2:
The patent introduces a second protective layer as an intermediary substance between the PIN diode and the external environment. This layer specifically blocks moisture and light from reaching the PIN diode, thereby preventing aging while allowing the detector to maintain its real-time imaging capability.
2Reliability
If protective layers are added to prevent moisture and light exposure, then reliability improves, but device complexity increases
Solution Approach 1:
The third protective layer serves multiple functions simultaneously: it protects both the thin-film transistor and the PIN diode from environmental factors, provides structural support, and maintains the overall integrity of the substrate. This multi-functionality reduces the need for additional separate protective structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent employs composite protective layers with different material properties optimized for specific protection needs. The first protective layer is designed to protect the thin-film transistor, while the second protective layer is optimized for the PIN diode. This composite approach allows each layer to be tailored for its specific function, improving overall reliability without unnecessarily complicating the structure.
3Reliability
If the second protective layer covers the entire PIN diode surface, then moisture barrier effectiveness improves, but hydrogen dehydrogenation path is blocked
Solution Approach 1:
The second protective layer is selectively positioned to cover only specific regions of the PIN diode where moisture protection is most critical, while leaving other regions exposed or partially exposed. This local protection approach allows the layer to provide effective moisture barrier performance in key areas while maintaining hydrogen dehydrogenation paths in regions where the thin-film transistor requires it.
Solution Approach 2:
The patent addresses the contradiction by considering the three-dimensional arrangement of protective layers. The second protective layer is configured in a specific spatial pattern that allows it to block moisture from reaching the PIN diode while simultaneously permitting hydrogen to escape from the thin-film transistor through alternative paths, effectively resolving the conflict in the vertical and lateral dimensions.
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 solution reduces the aging of PIN diodes and thin-film transistors, improves electrical characteristics uniformity, and enhances the reliability of digital X-ray detectors by securing dehydrogenation paths and minimizing light exposure.
Implementation Method 1
a second protective layer covering at least a portion of the PIN diode and not covering the thin-film transistor... SiNx for moisture barrier
Implementation Method 2
SiO2 or SiON for hydrogen dehydrogenation... securing dehydrogenation paths
Implementation Method 3
reduce or minimize incidence of light onto a side surface of a PIN diode
Data Source
AI summary
The present disclosure relates to a digital X-ray detector and a thin-film transistor array substrate for the same. Disclosed is a thin-film transistor array substrate for a digital X-ray detector in which deterioration of electrical characteristics of a thin-film transistors made of an oxide semiconductor may be reduced or minimized and aging of a PIN diode caused by external moisture may be reduced or minimized. Further, disclosed is a digital X-ray detector including the array substrate. To this end, the array substrate includes a second protective layer having a variety of patterns so as to cover at least a portion of the PIN diode but not to cover the thin-film transistor. The second protective layer includes SiNx. Thus, a de-hydrogenation path from the thin-film transistor may be secured and an external moisture barrier effect for the PIN diode may be achieved.