Pixel Common Transistor for Defect Line Detection
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Solution Overview
Problem
In existing display technologies, the common electrode lines can be short-circuited during manufacturing, making it impossible to accurately locate defect lines during signal detection, leading to grid-like connections and repair challenges.
Innovation Solution
A pixel design that includes a common transistor connecting adjacent common electrode lines, ensuring stability of the common voltage when turned on and allowing for accurate detection and repair of defect lines by turning off during signal detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If common electrode lines are electrically connected to form grid-like connections, then the common voltage stability is improved, but the ability to detect and locate defect lines deteriorates
Solution Approach 1:
The patent applies the dynamics principle by making the connection between common electrode lines controllable rather than fixed. The common transistor's conductivity type can be dynamically switched between first and second types, enabling the electrode lines to be electrically connected during normal operation for voltage stability, and electrically separated during signal detection for defect localization. This dynamic switching resolves the contradiction between maintaining stable common voltage and enabling precise defect detection.
2Measurement precision
If common electrode lines are electrically separated to enable defect detection, then the measurement precision is improved, but the common voltage stability deteriorates
Solution Approach 1:
The dynamics principle enables the system to switch between two operational states: during normal display operation, the common transistor maintains first conductivity type to electrically connect common electrode lines for voltage stability; during signal detection, it switches to second conductivity type to separate the lines for precise defect localization. This temporal separation of functions resolves the contradiction.
Solution Approach 2:
The patent implements periodic action by alternating between operation modes where the common transistor switches conductivity types at different time periods. The first conductivity type is applied during display operation periods, and the second conductivity type is applied during detection periods. This periodic switching allows the system to achieve both common voltage stability and defect detection precision at different times.
Data Source
AI summary
A pixel, an array substrate, and a display device are provided. The pixel includes a first driving transistor, a first storage capacitor, a second driving transistor, a second storage capacitor, and a common transistor. Gates of the first driving transistor and the second driving transistor are connected to a scan line. One of a source and a drain of the first driving transistor and the second driving transistor are connected to a data line. Another one of the source and the drain of the first driving transistor is connected to a first common electrode line through the first storage capacitor. Another one of the source and the drain of the second driving transistor is connected to a second common electrode line through the second storage capacitor. A source and a drain of the common transistor are respectively connected to the first common electrode line and the second common electrode line.