Emission Control Driving Circuit Isolation for Transistor Protection
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Solution Overview
Problem
Existing organic light emitting display devices face transistor breakdown due to excessive voltage drops between the gate and source in emission control driving circuits, leading to potential damage.
Innovation Solution
The implementation of cascaded emission control driving circuits with isolation units connected to power input terminals, which isolate gate-controlled voltages from the first and second gate voltage control circuits when they fall below a certain threshold, preventing excessive voltage drops and potential transistor damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emission control driving circuits are used to control emission periods of pixels, then the display device achieves fast response and low power consumption, but the transistors in the driving circuits are vulnerable to breakdown damage due to excessive voltage drops between gate and source
Solution Approach 1:
An isolation unit is introduced as an intermediary component between the gate voltage control circuits and the power input terminal. This isolation unit includes isolation transistors that act as protective mediators, preventing excessive voltage drops from directly affecting the main transistors while still allowing normal operation when voltages are within safe ranges
Solution Approach 2:
The isolation unit is configured to activate beforehand when voltage drops exceed predetermined thresholds. The isolation transistors are designed to turn on in advance to block harmful voltage fluctuations before they can reach and damage the main transistors, providing a protective cushion against voltage stress
Data Source
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AI summary
Embodiments of the present application provide a transmission control driving circuit, a transmission control driver and an organic light emitting display device. An isolation unit is connected to a second power input terminal, a first gate voltage control circuit and a second gate voltage control circuit. When one of the first gate-controlled voltage and the second gate-controlled voltage is lower than a voltage of the second power input terminal, the isolation unit isolates the first gate-controlled voltage or the second gate-controlled voltage which is lower than the voltage of the second power input terminal from the first gate voltage control circuit and/or the second gate voltage control circuit. The isolation unit provided in embodiments of the present application can prevent the voltage between the gate and the source of the transistor in the first gate voltage control circuit and the second gate voltage control circuit from being too large causing a breakdown accident, when the first gate-controlled voltage and the third gate-controlled voltage are too low.