Active Matrix Image Sensing Panel Data Line Reliability
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Solution Overview
Problem
Conventional X-ray imaging technologies face reduced product yield due to ambient particles causing data line breaks during manufacturing, which cannot be repaired in the multi-layered pixel structure of digital radiography panels.
Innovation Solution
An active matrix image sensing panel design featuring a substrate with image sensing pixels that include two thin-film transistors (TFTs) and a data line, where the second electrode and fourth electrode are connected and overlap the data line, allowing signal transmission to unbroken portions even if the data line is broken, reducing parasitic capacitance and enabling complete signal readout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-TFT pixel structure is used, then device complexity is reduced, but reliability deteriorates due to data line breaks from ambient particles during manufacturing
Solution Approach 1:
The pixel structure is segmented into two independent TFT devices (first TFT and second TFT), each with its own electrode connections to the data line. This segmentation allows the system to tolerate data line breaks by routing signals through alternative paths via the second electrode and fourth electrode that overlap the data line, thereby improving reliability without requiring complete structural duplication
Solution Approach 2:
The patent introduces a vertical dimension by having the second electrode and fourth electrode overlap the data line in the vertical direction. This three-dimensional electrode arrangement creates additional signal transmission paths through the overlapping region, enabling signals to bypass horizontal data line breaks and improving reliability while minimizing additional horizontal space consumption
2Adaptability or versatility
If multi-layered pixel structure is used, then functionality is improved, but ease of repair deteriorates as broken data lines cannot be repaired after manufacturing
Solution Approach 1:
The patent incorporates redundant electrode structures (second electrode and fourth electrode overlapping the data line) as a preventive measure during manufacturing. This beforehand cushioning ensures that if data line breaks occur during or after manufacturing, the overlapping electrodes provide alternative signal transmission paths, effectively compensating for the inability to repair broken data lines in multi-layered structures
3Reliability
If electrodes overlap the data line, then signal transmission reliability is improved, but parasitic capacitance increases
Solution Approach 1:
The overlapping electrode configuration is applied locally only where needed for reliability improvement, rather than throughout the entire pixel structure. The second electrode and fourth electrode overlap the data line specifically in regions where data line breaks are most likely to occur, providing targeted reliability enhancement while minimizing the total overlapping area and associated parasitic capacitance
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 ensures complete signal readout and improved product yield by allowing data line signals to be transmitted through unbroken sections via the overlapping electrodes, addressing the issue of broken data lines in the manufacturing process.
Implementation Method 1
a scintillator layer disposed on a side of the first photo-sensing device. The scintillator layer converts X-ray into visible light for example
Data Source
AI summary
An active matrix image sensing panel includes a substrate and an image sensing pixel. The image sensing pixel is disposed on the substrate and includes a data line, a first thin film transistor (TFT) device and a second TFT device. The first TFT device includes a first electrode, a second electrode and a first gate electrode. The second electrode is coupled to the data line through a first via. The second TFT device includes a third electrode, a fourth electrode and a second gate electrode. The fourth electrode is electrically connected to the data line through a second via. The second electrode and the fourth electrode are connected with each other and overlap the data line.