Anticreeping Transistor Series Circuit for LED Display Leakage Control
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Solution Overview
Problem
In LED displays, the high leakage current through selection transistors due to large voltage differences between gate and source voltages affects the normal display, as the voltage of the data signal is pulled up, leading to an inability to maintain the original voltage, which is not conducive to achieving a narrow bezel design.
Innovation Solution
The implementation of a series connection between selection transistors and anticreeping transistors, where the anticreeping transistors are turned off with a lower voltage than the selection transistors, ensuring a conducting path is formed only when the selection transistors are turned on and disconnected when turned off, thereby minimizing leakage current and maintaining the data signal voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If selection transistors are used to control data signals in LED displays, then data transmission and display control are enabled, but leakage current increases due to large voltage differences between gate and source voltages
Solution Approach 1:
The selection transistor is divided into two separate transistors: a selection transistor for controlling data signal transmission and an anticreeping transistor for preventing leakage current. This segmentation allows each transistor to be optimized for its specific function, with the anticreeping transistor specifically designed to block leakage paths without affecting the selection transistor's switching performance.
Solution Approach 2:
The anticreeping transistor acts as an intermediary component between the data signal terminal and the selection transistor. It is positioned in series to specifically block leakage current paths while allowing normal data signal transmission when the selection transistor is active. The independent control signals enable it to mediate between maintaining voltage levels and preventing leakage.
2Reliability
If more data transmission lines are used to connect drive chips to LED displays, then data signal transmission to each data line is improved, but the bezel width increases
Solution Approach 1:
The invention changes the electrical parameters (voltage levels) of control signals to enable the anticreeping transistor to effectively block leakage current. By using a second turn-off signal with lower voltage than the first turn-off signal, the system maintains reliable data transmission while reducing the need for additional data lines, thus helping to minimize bezel width.
3Ease of operation
If the voltage of the data signal is allowed to be pulled up due to leakage current, then transistor switching is simplified, but the original voltage cannot be maintained affecting display quality
Solution Approach 1:
The anticreeping transistor is turned on in advance before the selection transistor is turned off, creating a protective barrier that prevents leakage current from pulling up the data signal voltage. This preliminary action ensures that when the selection transistor switches, the voltage level is already protected and can be maintained without affecting display quality.
Data Source
AI summary
Disclosed is an array substrate including multiple first selection circuits with each including at least two first selection transistors and at least two first anticreeping transistors. Each first selection transistor is connected with one first anticreeping transistor in series. When the first selection transistor is turned on by a first turn-on signal from a first control signal terminal, the first anticreeping transistor is turned on by a second turn-on signal from a second control signal terminal. When the first selection transistor is turned off by a first turn-off signal from the first control signal terminal, the first anticreeping transistor is turned off to make the first selection transistors and the data signal terminal disconnected, by a second turn-off signal from the second control signal terminal. A voltage of the first turn-off signal is greater than a voltage of the second turn-off signal.