Display Panel Driver Amplifier with Dual-Voltage Current Reuse
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Solution Overview
Problem
Source drivers for LED panels face high current consumption due to the lack of polarity inversion mechanisms, leading to inefficient DC and driving current usage compared to LCD panels.
Innovation Solution
The amplifier design incorporates an output stage with multiple output driving circuits operating in different voltage domains, allowing for high-voltage and low-voltage modes, enabling current reuse between operational amplifiers and reducing overall current consumption by configuring channels to share voltage sources and driving currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple operational amplifiers are used to drive multiple data lines on the panel, then the display driving capability is improved, but the current consumption of the source driver increases significantly
Solution Approach 1:
The patent merges the voltage domains of adjacent channels by coupling the output terminal of an operational amplifier to a data line in a first voltage domain and also to a data line in a second voltage domain. This allows one operational amplifier to drive multiple data lines across different voltage domains, reducing the total number of operational amplifiers needed and thereby reducing current consumption while maintaining driving capability.
Solution Approach 2:
The operational amplifier is designed to perform multiple functions by operating in different voltage domains. The same operational amplifier can drive data lines in both the first voltage domain (higher voltage) and the second voltage domain (lower voltage), making it a multi-functional component that reduces the overall count of required amplifiers.
2Device complexity
If each operational amplifier operates independently in a fixed voltage domain, then the circuit design is simple, but the current consumption cannot be reduced
Solution Approach 1:
The patent introduces dynamic switching between voltage domains using control signals. The output terminal of the operational amplifier can be dynamically coupled to different data lines based on the voltage domain requirements. This dynamic operation allows the system to optimize current consumption by selecting appropriate voltage domains for different channels while maintaining a relatively simple underlying circuit structure.
3Use of energy by moving object
If the output terminal is coupled to data lines in different voltage domains, then current reuse is enabled and current consumption is reduced, but the circuit complexity increases
Solution Approach 1:
The patent uses control signals as intermediaries to manage the coupling between the operational amplifier output terminal and data lines in different voltage domains. These control signals dynamically enable or disable specific couplings, allowing the system to achieve current reuse across voltage domains while keeping the control mechanism relatively simple and manageable.
Data Source
AI summary
An amplifier for driving a display panel includes an input stage, a gain stage and an output stage. The gain stage is coupled to the input stage. The output stage, coupled to the gain stage, includes a first output driving circuit and a second output driving circuit. The first output driving circuit is operated in a first voltage domain. The second output driving circuit is operated in a second voltage domain different from the first voltage domain.