Driving Amplifier Slew Rate Control for High-Refresh Displays

The patent implements a dynamic current supply mechanism where the amplifier switches between a first current (higher magnitude) and a second current (lower magnitude) based on the absolute value of the input signal. When the input signal exceeds a reference threshold, the higher current is supplied to achieve faster slew rate for large signal changes. When the input signal is within the threshold range, the lower current is supplied to reduce power consumption. This dynamic adaptation resolves the contradiction by providing high speed only when necessary for large load capacitance driving.

The patent changes the operating parameters of the amplifier by adjusting the supply current magnitude based on input signal characteristics. The controller monitors the input signal and modifies the current parameter dynamically, switching between two distinct current levels. This parameter change enables the amplifier to achieve high slew rate when needed (for large signals with large load capacitance) while maintaining energy efficiency during normal operation, thus resolving the speed-capacitance tradeoff.

The patent applies preliminary action by proactively increasing the supply current to a higher magnitude when detecting that the input signal exceeds the reference threshold, before the actual output distortion can occur. This anticipatory current increase ensures the amplifier is already in high-speed mode when large signal changes are detected, allowing the amplifier to keep up with reduced horizontal periods and higher refresh rates without signal distortion.

The patent makes the amplifier response dynamic by continuously monitoring the input signal and adjusting the current supply in real-time. When fast response is needed (large input signals during reduced horizontal periods), the system dynamically switches to higher current mode. This dynamic adaptation allows the amplifier to maintain adequate response time even when the overall horizontal period is reduced for higher refresh rates.

The patent implements periodic action by alternately switching between two current magnitudes based on the input signal characteristics. The amplifier periodically transitions between high-current mode (when |input signal| > reference threshold) and low-current mode (when |input signal| ≤ reference threshold). This periodic switching maintains high slew rate only during necessary periods while reducing power consumption during other periods, resolving the speed-energy contradiction.

The patent changes the current parameter dynamically rather than maintaining a fixed high value. The supply current magnitude is adjusted according to the input signal amplitude, switching between two discrete levels. This parameter change strategy ensures high slew rate is achieved only when required for large signal changes, while power consumption is reduced during normal operation with smaller signals.

The patent implements dynamic current control where the amplifier switches between high and low current modes based on the absolute value of the input signal relative to a reference threshold. High current (and associated heat generation) is activated only when fast response is genuinely needed for large signal changes. During normal operation with smaller signals, the amplifier operates at low current, significantly reducing heat generation. This dynamic adaptation resolves the speed-heat contradiction by minimizing thermal load while maintaining response capability when required.

The patent changes the operating current parameter dynamically based on signal requirements, switching between two current magnitudes. This parameter change ensures that maximum current and associated heat generation occur only during brief periods when fast response is necessary, rather than continuously. The average heat generation is significantly reduced while maintaining the ability to handle fast-changing signals when they occur.