Buffer Slew Rate Enhancement Circuit for Low-Power High-Speed Driving
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Solution Overview
Problem
High-speed operation of display device buffers requires minimizing power consumption while maintaining high-speed performance, which existing technologies struggle to achieve effectively as increased frame frequencies and resolutions lead to increased power consumption and reduced slew rate sections, affecting buffer stability and frequency characteristics.
Innovation Solution
The introduction of a slew rate enhancement circuit that controls current flow through multiple transistors and current sources using control voltages and switches, minimizing current flow when not necessary to reduce power consumption and extend slew rate sections, thereby optimizing buffer performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frame frequency and resolution are increased, then display quality and speed are improved, but power consumption increases and slew rate section decreases
Solution Approach 1:
The patent implements dynamic control of the buffer circuit by using a slew rate enhancement circuit that adjusts the current flowing through the buffer based on the operating conditions. The circuit includes control transistors that modulate the current path, allowing the buffer to operate at high speed when needed while reducing power consumption during normal operation. This dynamic adjustment resolves the contradiction between maintaining high frame frequency performance and reducing power consumption.
2Productivity
If frame frequency and resolution are increased, then display quality and speed are improved, but slew rate section decreases
Solution Approach 1:
The patent employs a slew rate enhancement circuit that prepares and enhances the current driving capability before the buffer needs to switch states. The control circuit anticipates the need for high-speed operation and pre-adjusts the current flow through the buffer transistor, ensuring that the slew rate section is extended and maintained even at high frame frequencies. This preliminary action prevents the degradation of slew rate that would normally occur with increased operating frequency.
3Speed
If current flow is increased to maintain high-speed operation, then buffer speed is improved, but power consumption increases
Solution Approach 1:
The patent changes the electrical parameters of the buffer circuit dynamically by using control voltages to adjust the gate-source voltage of the buffer transistor. The slew rate enhancement circuit modifies the current parameter based on the required operating speed, allowing the buffer to achieve high-speed operation only when necessary. During normal operation, the current parameter is reduced, thereby lowering power consumption while maintaining adequate performance.
Data Source
AI summary
The slew rate enhancement circuit includes: a first transistor located between a first power source and an eleventh node, the first transistor having a gate electrode coupled to the eleventh node, the first transistor being coupled as a current mirror to the first current source; a third current source having the other side coupled to a second power source lower than the first power source; a second transistor coupled between the first power source and the eleventh node; a third transistor coupled between the eleventh node and one side of the third current source; a fourth transistor coupled between the first power source and a twelfth node; and a fifth transistor coupled between the twelfth node and the one side of the third current source.