Capacitance Load Driving Circuit with Adjustable Bias Current
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Solution Overview
Problem
Conventional driving circuits for liquid crystal display devices waste bias current when updating target voltages, leading to inefficient power consumption.
Innovation Solution
A driving circuit with a current-adjustable constant current source and a control mechanism that detects differences in target voltage values to adjust bias current levels and durations, reducing unnecessary current usage by optimizing the passing rate and duration of bias current based on voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a constant bias current is supplied to the amplifier to maintain driving ability, then the amplifier can quickly respond to voltage changes, but power consumption increases due to unnecessary current usage during small voltage updates
Solution Approach 1:
The patent applies dynamics by making the bias current adjustable rather than constant. The constant current source is modified to allow dynamic adjustment of the bias current level based on the magnitude of voltage changes, enabling the system to adapt between high-speed response and low-power consumption modes
Solution Approach 2:
The patent changes the parameter of bias current from a fixed value to a variable value that depends on the voltage difference magnitude. By controlling the constant current source to output different current levels, the system optimizes the balance between response speed and power consumption based on actual driving needs
2Power
If a high bias current is maintained in the amplifier, then the driving ability and voltage update speed are improved, but excessive power is consumed during periods when small voltage adjustments are needed
Solution Approach 1:
The patent implements parameter changes by adjusting the bias current level according to the absolute value of voltage difference. When voltage changes are large, higher bias current provides strong driving ability; when voltage changes are small, lower bias current reduces energy waste
Solution Approach 2:
The system dynamically adjusts the bias current based on real-time voltage difference detection, making the driving circuit adaptable to different operating conditions and minimizing energy loss while maintaining sufficient driving ability
3Stability of the object's composition
If the bias current is continuously supplied without adjustment, then the amplifier maintains consistent performance, but power efficiency decreases during incremental voltage updates
Solution Approach 1:
The patent introduces dynamic adjustment of bias current while maintaining performance consistency through feedback control. The control circuit monitors voltage differences and adjusts bias current accordingly, ensuring the amplifier maintains appropriate performance levels without unnecessary energy consumption
Solution Approach 2:
The system employs feedback by detecting the voltage difference between consecutive frames and using this information to adjust the bias current. This closed-loop control ensures consistent amplifier performance adapted to actual driving requirements, improving power efficiency
Data Source
AI summary
A driving circuit and display device reducing waste of a bias current of an amplifier and conserving power. The driving circuit includes a driving signal supply mechanism, an amplifier mechanism and a control mechanism. The supply mechanism supplies a driving signal having a target voltage represented during periodic update. The amplifier mechanism has an amplifier part, a current-adjustable constant current source and a switch part. The driving signal is input to the amplifier part, which generates an output to a capacitance load according to the driving signal. The current source supplies and regulates a passing rate of the bias current to the amplifier part. The switch part performs ON/OFF control to the current output to the current source. The control mechanism detects a difference between the previous and present values of the target voltage to change a current value of the current source.