Output Circuit Boost Topology for Fast Low-Power Data Drivers
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Solution Overview
Problem
Current data drivers for display devices face challenges in achieving high-speed operation while minimizing power consumption and area, particularly in supporting high-definition displays with increased gray scales and frame frequencies, leading to increased power consumption and heat generation.
Innovation Solution
The proposed output circuit includes a differential input stage, an output amplification stage, and an amplification boost circuit with specific current sources and transistors configurations that dynamically adjust current sources based on voltage differences between input and output terminals to enhance amplification and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output circuit uses a conventional configuration to support high-definition displays with increased gray scales and frame frequencies, then the display quality and speed are improved, but the power consumption and heat generation increase
Solution Approach 1:
The patent implements dynamic current control by switching between first and second current sources based on whether the output voltage is increasing or decreasing. This dynamic adaptation allows the circuit to optimize power consumption while maintaining high-speed operation capability, directly resolving the contradiction between productivity and energy use
Solution Approach 2:
The patent changes the current supply parameters dynamically by selecting different current sources (first or second) depending on the voltage transition direction. This parameter change enables the circuit to achieve high frame frequencies when needed while reducing power consumption during normal operation
2Productivity
If the output circuit uses a conventional configuration to support high-definition displays with increased gray scales and frame frequencies, then the display quality and speed are improved, but the area occupied by the circuit increases
Solution Approach 1:
The patent designs the output circuit to perform multiple functions using shared components. The first and second current sources, along with the switching mechanism, enable both high-speed operation and power-efficient operation within the same circuit structure, achieving multi-functionality that improves productivity without proportionally increasing area
3Use of energy by moving object
If the output circuit uses asymmetric current sources for charging and discharging, then the power consumption is reduced, but the output waveform symmetry deteriorates
Solution Approach 1:
The patent dynamically selects different current sources based on the voltage transition direction (charging or discharging). This dynamic switching allows the circuit to use optimized current paths for each direction, achieving power consumption reduction while maintaining waveform symmetry through controlled adaptation rather than fixed asymmetric design
Data Source
AI summary
An output circuit is capable of supporting a high-speed operation, suppressing power consumption, and controlling its area. The output circuit has a differential input stage, an output amplification stage, and an amplification boost circuit, in which the amplification boost circuit has a differential pair of a second conductivity type and load element pair, and includes a first current source circuit for controlling current supply to an input node of a second current mirror circuit of the differential input stage and boost the charging operation of the output amplification stage according to a voltage difference between input and output voltages, and a second current source circuit for controlling current supply to an output node of a first current mirror circuit of the differential input stage and boost the discharging operation of the output amplification stage.