Image Detector Metal Layer Segmentation Reduces Noise
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The production yield of TFT arrays in radiation image detectors is hindered by line defects, and the image quality is compromised due to high electronic noise caused by line capacitance in the data lines.
Innovation Solution
The data lines and scan lines are formed using distinct metal layers with insulating films in between, reducing line capacitance and improving production yield while enhancing image quality by minimizing electronic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data lines and scan lines are formed in the same metal layer, then manufacturing process is simplified, but line capacitance increases causing high electronic noise and reduced image quality
Solution Approach 1:
The patent divides the metal layers into separate layers: one metal layer forms the scan lines and charge collecting electrodes, while another metal layer forms the data lines. This segmentation physically separates the data lines from the scan lines, reducing capacitive coupling and line capacitance, thereby decreasing electronic noise and improving image quality.
2Device complexity
If data lines and scan lines are formed in the same metal layer, then device structure is simplified, but production yield decreases due to line defects
Solution Approach 1:
By segmenting the conductive lines into separate metal layers (scan lines in one layer, data lines in another layer), the patent eliminates line defects that occur when all lines are formed in a single layer. This segmentation allows independent formation and inspection of each line type, improving production yield despite increased structural complexity.
3Ease of manufacture
If data lines and scan lines are formed in the same metal layer, then manufacturing steps are reduced, but line capacitance increases reducing production yield
Solution Approach 1:
The patent segments the line formation into separate manufacturing steps for different metal layers. Although this increases the number of manufacturing steps, it significantly reduces line capacitance and eliminates line defects, thereby improving the production yield of TFT arrays.
4Ease of manufacture
If data lines and scan lines are formed in the same metal layer, then manufacturing process is simpler, but image quality deteriorates due to high electronic noise
Solution Approach 1:
By segmenting the data lines and scan lines into separate metal layers, the patent reduces capacitive coupling and line capacitance, thereby minimizing electronic noise. This improvement in signal quality directly enhances the manufacturing precision and image quality of the detected images.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention provides an image detector capable of improving the quality of detected images by reducing electronic noise, the image detector comprising, a plurality of scan lines (101) disposed in parallel, a plurality of data lines (3) provided so as to cross with the scan lines, thin film transistors (4) connected with the scan and data lines and provided in matrix, sensor sections (103) connected to the thin film transistor and provided in a matrix and a plurality of common lines disposed so as to apply bias voltage commonly to the sensor sections provided in matrix. Each of the scan lines, data lines and common lines are formed by metal layers different from each other and provided with insulating film(s) disposed therebetween.