Antistatic Wire Design for X-ray Imaging Substrates
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Solution Overview
Problem
During the manufacturing of active matrix substrates for X-ray imaging panels, static electricity can cause cleaning water to become charged and accumulate in specific regions, leading to increased dark currents in photoelectric conversion elements due to uneven charge distribution and accumulation.
Innovation Solution
An active matrix substrate design incorporating an antistatic wire in a frame region surrounding the pixel area, with an insulating film covering both regions and an antistatic hole bored through the film to expose the wire, effectively dissipates static charges by diffusing or canceling out electric charges from the cleaning water, preventing biased charge accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cleaning water is ejected onto the active matrix substrate to remove contamination, then cleaning effectiveness is improved, but static charge accumulation occurs leading to increased dark current
Solution Approach 1:
An antistatic wire is introduced as an intermediary element between the cleaning water and the photoelectric conversion elements. The wire intercepts and dissipates static charges from the cleaning water before they can accumulate on the substrate and cause dark current increases in the pixels.
Solution Approach 2:
The patent converts the harmful static charge effect into a beneficial outcome by using the charged cleaning water to charge the antistatic wire, which then acts as a charge reservoir to prevent charge accumulation on the substrate. The harmful static electricity is redirected to serve a protective function.
2Productivity
If the active matrix substrate is dried with an air knife during transport, then drying efficiency is improved, but cleaning water accumulates in specific regions causing charge concentration
Solution Approach 1:
The antistatic wire serves as a mediator that intercepts charged cleaning water pushed by the air knife flow. Instead of allowing the water to accumulate in specific regions and create charge concentration, the wire provides a designated path for charge dissipation.
3Reliability
If an antistatic wire is added to surround the pixel region, then dark current reduction is achieved, but device complexity increases
Solution Approach 1:
The antistatic wire performs multiple functions: it surrounds and protects the pixel region from static charge, provides a path for charge dissipation, and can be integrated with existing substrate structures. This multi-functionality justifies the added structural element.
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 significantly reduces dark current increases in photoelectric conversion elements by ensuring even charge distribution and preventing static charge accumulation, thereby enhancing the imaging panel's performance and reliability.
Implementation Method 1
an antistatic wire provided in a frame region outside the pixel region so as to surround the pixel region... the antistatic wire has a surface exposed in the antistatic hole
Implementation Method 2
an insulating film covering a portion of the frame region and the pixel region
Data Source
AI summary
An active matrix substrate includes a pixel region including a plurality of pixels over a substrate and a frame region outside the pixel region. In the plurality of pixels, a plurality of photoelectric conversion elements are provided. In the frame region, an antistatic hole is provided. The pixel region and a portion of the frame region are covered with an insulating film, and the antistatic hole is bored through the insulating film. An antistatic wire is provided in the frame region so as to surround the pixel region, and has a surface exposed in the antistatic hole.