Negative Voltage Signal Generation Circuit Stability
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Solution Overview
Problem
Conventional negative voltage signal generation circuits in driving circuits for display panels suffer from low response speed and endurance power, leading to accuracy and stability issues.
Innovation Solution
A negative voltage signal generation circuit utilizing thin film transistors (TFT) switches and capacitors, along with a control signal generation unit, phase inverter, and regulation resistor, to manage current channels and voltage levels, improving stability and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional negative voltage signal generation circuit is used, then the circuit structure is simple, but the response speed is low and accuracy is degraded
Solution Approach 1:
The circuit is divided into multiple TFT switches (first TFT switch, second TFT switch) that operate in alternating cycles. Each switch controls a separate current channel (first current channel, second current channel), allowing parallel processing and improving response speed while maintaining manageable complexity through modular design
Solution Approach 2:
The circuit employs periodic alternating operation of the first and second TFT switches through complementary control signals. The switches alternately turn on and off in cycles, with each cycle charging or discharging capacitors to generate the negative voltage signal, thereby achieving high-speed periodic signal generation
2Reliability
If conventional negative voltage signal generation circuit is used, then the circuit design is simple, but the endurance power is low and stability is affected
Solution Approach 1:
Capacitors are pre-charged during the first current channel's on-state before the second current channel activates. This preliminary charging action ensures that when the second TFT switch turns on, the capacitor is already prepared to quickly discharge and generate the negative voltage signal, improving both stability and power efficiency
Solution Approach 2:
The circuit maintains continuous operation by alternating between two current channels. While one channel is discharging to generate the negative voltage signal, the other channel is simultaneously charging its capacitor in preparation, ensuring uninterrupted signal generation and improving endurance power
3Measurement precision
If conventional negative voltage signal generation circuit is used, then the circuit configuration is simple, but the accuracy of voltage values is degraded
Solution Approach 1:
The control signal generation unit produces complementary control signals that regulate the alternating operation of the two TFT switches and their associated capacitors. This feedback-controlled alternating charge-discharge cycle ensures precise voltage level transitions, improving the accuracy of the generated negative voltage signal while maintaining reasonable circuit complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the stability and reduces power loss of the negative voltage signal generation circuit, improving the accuracy and reliability of the generated voltage signals.
Implementation Method 1
a first capacitor comprising a first pole plate and a second pole plate, wherein the first pole plate connects to a first connection wire between the first TFT switch and the second TFT switch, and the second pole plate is connected to the control signal generation unit; wherein the second pole plate is charged by electrical charges which correspond to the first control signal issued from the control signal generation unit when the first current channel is turned on
Data Source
AI summary
A negative voltage signal generation circuit is described. The first thin film transistor (TFT) connects the first ground terminal to the control signal generation unit. The second TFT switch connects to the first TFT switch, the control signal generation unit and the negative voltage signal output terminal. The first capacitor connects to the first TFT switch, the second TFT switch and the control signal generation unit. The present invention is capable of improving the stability of the negative voltage signal generation circuit.