Light Emitting Signal Generator Circuit for High-Voltage Aging Relief
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Solution Overview
Problem
Current light-emitting diode display devices experience a shortened enabling period for the light emitting signal, leading to prolonged high-voltage states for elements in the light emitting signal generator, which accelerates aging and reduces reliability.
Innovation Solution
A light emitting signal generator is designed with an output stage circuit, control signal generators, a switch, and a capacitor. The switch and capacitor form a voltage divider circuit to reduce voltage stress on the output stage circuit, and the switch disconnects the control end from the output stage during high-voltage periods to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the enabling period of the light emitting signal is shortened, then the productivity of the display device is improved, but the elements in the light emitting signal generator remain in high-voltage bias state longer, accelerating aging and reducing reliability
Solution Approach 1:
The circuit is divided into distinct functional segments: the output stage circuit that generates high-voltage light emitting signals, and the control signal generator that operates at lower voltages. The switch isolates these segments, allowing the control portion to be protected from high-voltage stress while the output portion maintains short enabling periods for high productivity.
Solution Approach 2:
The switch acts as an intermediary component between the control signal generator and the output stage circuit. It selectively connects or disconnects the control end from the output stage, preventing high-voltage bias from being applied to control elements during periods when the light emitting signal is not actively being generated, thus reducing aging without compromising productivity.
2Object-affected harmful factors
If the switch and capacitor form a voltage divider circuit, then the voltage stress on the output stage circuit is reduced, but the device complexity increases
Solution Approach 1:
The capacitor serves as an intermediary element that, together with the switch, forms a voltage divider circuit. This intermediary structure reduces the voltage stress on the output stage circuit by distributing the voltage across the capacitor and switch, thereby protecting sensitive components from excessive voltage without requiring a complete redesign of the output stage.
Solution Approach 2:
The voltage divider circuit changes the voltage parameter distribution in the circuit. By introducing the capacitor in series with the switch, the voltage across the output stage circuit is reduced to a safer level during high-voltage operation, effectively lowering the harmful voltage stress while maintaining the necessary functionality.
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 effectively reduces the aging rate of elements in the light emitting signal generator, improves output stability, and enhances the reliability of the display device by minimizing the impact of high-voltage biases.
Implementation Method 1
the first capacitor and the capacitor in the output stage circuit may form a voltage divider circuit, thereby reducing the voltage to which the output stage circuit is subjected
Data Source
AI summary
A display panel and a light emitting signal generator thereof are provided. The light emitting signal generator includes an output stage circuit, a first control signal generator, a second control signal generator, a switch, and a capacitor. The output stage circuit generates a light emitting signal according to a first control signal and a second control signal. The first control signal generator generates the first control signal at a first control end. The second control signal generator generates the second control signal at a second control end. The switch is coupled between the first control end and the output stage circuit. The first capacitor is coupled to the first control end.