Bistable Circuit Module for Driving Transistor Gate Potential Control
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Solution Overview
Problem
Existing light emitting circuits, particularly those using PWM driving mode, face challenges in accurately controlling the luminous time of light emitting devices, which affects image quality and gray-scale display.
Innovation Solution
A light emitting circuit design incorporating a driving transistor, data signal writing module, first and second control modules, and a bistable circuit module, which work together to quickly change the potential of the driving transistor's gate, enabling precise control over the luminous time of the light emitting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PWM driving mode is used, then constant current and high luminous efficiency are achieved, but accurate control of luminous time is difficult
Solution Approach 1:
The patent introduces a dynamic control mechanism using a bistable circuit module that can rapidly switch between two stable states. This dynamic switching capability allows precise control of the luminous time by controlling the transition between states, resolving the contradiction between maintaining high luminous efficiency and achieving accurate luminous time control.
Solution Approach 2:
The patent changes the control parameter from traditional PWM duty cycle to a voltage potential control mechanism. By using the bistable circuit to control the gate potential of the driving transistor, the system achieves precise luminous time control while maintaining the constant current and high efficiency characteristics of PWM driving mode.
2Use of energy by moving object
If traditional PWM control is used, then high luminous efficiency is maintained, but device complexity increases due to high-frequency signal requirements
Solution Approach 1:
The patent replaces the complex high-frequency PWM signal generation and processing system with a simpler voltage potential control mechanism. The bistable circuit module uses voltage thresholds to control transistor gating, eliminating the need for complex high-frequency signal generation while maintaining PWM's efficiency benefits.
Solution Approach 2:
The patent introduces a bistable circuit module as an intermediary between the control signal and the driving transistor. This intermediary component simplifies the overall system by providing a clean binary state transition mechanism that avoids the complexity of direct high-frequency PWM control while maintaining luminous efficiency.
3Reliability
If PWM driving mode is used, then constant current is achieved, but gray-scale display accuracy is reduced
Solution Approach 1:
The patent uses dynamic voltage potential control through the bistable circuit to achieve precise gray-scale control. By controlling the timing and magnitude of voltage transitions to the transistor gate, the system can accurately control the duration and intensity of light emission, improving gray-scale display accuracy while maintaining constant current stability.
Solution Approach 2:
The patent employs preliminary voltage setup and control mechanisms that prepare the gate potential in advance before the actual light emission. This preliminary action allows for precise control of the luminous time and intensity, enabling accurate gray-scale display while maintaining the constant current characteristics needed for reliable operation.
Data Source
AI summary
The present application discloses a light emitting circuit, a backlight module and a display panel. The light emitting circuit includes a light emitting device, a driving transistor, a data signal writing module, a first control module, a bistable circuit module, and a second control module. The first control module, the bistable circuit module, and the second control module work together to control a potential reversal of a gate of the driving transistor. By setting a bistable circuit module in the light emitting circuit, the present application can quickly change the potential of the gate of the driving transistor, so as to accurately control the luminous time of the light emitting device.