Array Substrate Four-Input Shift Registers for Stable Scan Switching
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Solution Overview
Problem
Conventional shift register units in gate drivers on array (GOA) experience threshold voltage drift during long periods of forward or reverse scanning, leading to operational failures when switching scanning directions.
Innovation Solution
The array substrate incorporates a scanning circuit with multiple stages of shift register units, each comprising four input units connected to different power supply terminals, ensuring that the first and fourth units pull down the potential while the second and third units pull up the potential, using distinct power supply signals to maintain stable operation during both forward and reverse scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional shift register units are used for forward and reverse scanning, then the gate driver can switch scanning directions, but threshold voltage drift occurs in transistors after long period operation, leading to operational failure
Solution Approach 1:
The shift register unit is segmented into four distinct input units (first, second, third, and fourth input units), each with separate control terminals connected to different trigger terminals. This segmentation allows independent control of each input unit, enabling the circuit to maintain stable operation during scanning direction switching by preventing threshold voltage drift through differentiated power supply signal application.
2Device complexity
If the same power supply signal is used for all input units, then the circuit design is simplified, but threshold voltage drift occurs during long period scanning operation
Solution Approach 1:
Different power supply signals (first power supply signal and second power supply signal) are applied to different input units based on their specific functional requirements. The first and fourth input units receive one power supply signal while the second and third input units receive another, creating local quality differences that prevent threshold voltage drift and ensure reliable operation during scanning direction switching.
Data Source
AI summary
Provided are an array substrate and a display panel. The array substrate includes a scanning circuit including shift register units, each of which includes a forward and reverse scanning module including a first to fourth input units. The first to fourth input units includes a first to fourth transistors, respectively. First electrodes of the first and fourth transistors are connected to a first power supply terminal continuously providing a low-level signal. First electrodes of the second and third transistors are connected to a second power supply terminal continuously providing a high-level signal. Second electrodes of the first to fourth transistors are connected to a pull-up node. The first and fourth transistors pull down a potential of the pull-up node. The second and third transistors pull up the potential. During switching between forward scanning and reverse scanning, the roles of the first to fourth transistors do not change.