TFT Substrate Inspection via Non-Display Test Transistors
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Solution Overview
Problem
Current manufacturing processes for liquid crystal display panels face inefficiencies in inspecting thin film transistor substrates, particularly in detecting defects in both display and non-display areas, which affects yield and cost-effectiveness.
Innovation Solution
Incorporating test parts in non-display areas of thin film transistor substrates, including gate and data pad parts with test transistors, to facilitate inspection using both visual and non-contact or contact techniques, allowing for the detection of defects in display and non-display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection is used to detect defects in the display area, then defect detection capability is improved, but defects in the non-display area cannot be detected
Solution Approach 1:
The substrate is divided into display area and non-display area, with separate inspection methods applied to each. Visual inspection handles the display area while contact/non-contact inspection handles the non-display area through dedicated test parts
Solution Approach 2:
Test parts including test transistors and test pads are introduced as intermediaries in the non-display area to enable indirect inspection of defects that cannot be directly observed through visual inspection
2Adaptability or versatility
If test parts are added to the substrate, then inspection capability is improved, but substrate complexity increases
Solution Approach 1:
Test parts are extracted and placed exclusively in the non-display area, separating inspection functions from the display functional area. This minimizes impact on the display area while providing comprehensive inspection capability
Solution Approach 2:
Instead of inspecting the entire substrate uniformly, inspection resources are concentrated on the non-display area through dedicated test parts, achieving sufficient inspection coverage without unnecessary complexity in the display area
Data Source
AI summary
A thin film transistor substrate, includes: pixels disposed in a display area of the thin film transistor substrate and connected to gate lines and data lines; gate pad parts connected to first ends of the gate lines; first test transistors each being connected to a second end of a corresponding gate line of the gate lines; data pad parts connected to first ends of the data lines; and second test transistors each being connected to a second end of a corresponding data line of the data lines. The gate pad parts, the data pad parts, the first test transistors, and the second test transistors are disposed in a non-display area of the thin film transistor substrate. The first test transistors are configured to be switched to receive a first inspection signal and the second test transistors are configured to be switched to receive a second inspection signal.