Thin-Film Transistor Layout for Directional Characteristic Comparison
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Solution Overview
Problem
Existing thin film transistor (TFT) testing methods fail to accurately account for the variation in characteristics due to different extension directions of the active layer patterns, leading to inaccurate comparison results.
Innovation Solution
The TFT design includes a semiconductor layer with a non-doped part surrounded by doped parts, and a gate electrode that overlaps the non-doped part perpendicularly, allowing for accurate comparison of sub-TFT characteristics by ensuring channel regions have overlapping portions, thus correlating characteristics with active layer pattern directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional TFT testing methods are used, then testing can be performed, but the comparison results of TFT characteristics are inaccurate due to not accounting for variation from different extension directions of active layer patterns
Solution Approach 1:
The active layer is segmented into multiple doped parts and non-doped parts with different extension directions. By dividing the active layer into distinct regions with controlled doping patterns, the patent enables separate testing of TFT characteristics along different extension directions, allowing accurate comparison while accounting for directional variations in material properties
Solution Approach 2:
Different regions of the active layer are given different local qualities through selective doping. The doped parts have modified electrical properties compared to non-doped parts, creating localized variations that enable testing of how TFT characteristics respond to different active layer configurations and extension directions
Data Source
Figure 1a~2
Figure 3a~3c
Figure 4a~5a
AI summary
A thin film transistor and manufacturing and testing methods thereof, an array substrate and a display device, and the thin film transistor (100) includes a semiconductor layer (120), at least three source/drain electrodes (130) and a gate electrode (110). The semiconductor layer (120) includes a non-doped part (129) and at least three doped parts (120a) which are connected with and continuously formed with the non-doped part (129); the doped parts (120a) are spaced from each other and distributed at a periphery of the non-doped part (129); the source/drain electrodes (130) are spaced from each other and respectively electrically connected with the doped parts (120a); and the gate electrode (110) overlaps the non-doped part (129) in a direction perpendicular to the semiconductor layer (120) and at least extends to a junction of the non-doped part (129) and each doped part (120a). The thin film transistor (100) can improve the accuracy of comparison results of the characteristics of sub-thin film transistors included by the thin film transistor.