Display Driver Channel Current Control for Power and Slew Rate

The patent divides the display driving apparatus into multiple independent output channels (first output channel, second output channel, etc.), each with its own consumption current control circuit. This segmentation allows each channel to independently control its consumption current based on its own driving pattern, rather than forcing the entire chip to operate at high current to satisfy the needs of any single channel.

The patent implements dynamic control of consumption current by comparing the difference between input voltage and output voltage with a reference value. When the voltage difference exceeds the reference value (indicating high-speed transition needed), the consumption current control circuit activates to provide additional current. When the voltage difference is small (low-speed transition), the circuit remains inactive, maintaining low power consumption. This dynamic adjustment resolves the contradiction between maintaining high slew rate capability and reducing overall power consumption.

The patent introduces separate consumption current control circuits for each output channel within the chip. The first consumption current control circuit is dedicated to the first output channel, and the second consumption current control circuit is dedicated to the second output channel. This segmentation enables independent optimization of each channel's power consumption based on its specific driving requirements, while still maintaining overall power control capabilities.

The patent applies local quality by allowing each output channel to have its own consumption current characteristics tailored to its specific needs. Each channel's control circuit independently determines whether to activate based on its own voltage difference comparison, enabling localized power optimization rather than uniform power control across the entire chip.

The patent implements dynamic power management by continuously monitoring the voltage difference between input and output signals. When fast transitions are detected (voltage difference exceeds reference value), the system dynamically increases power delivery through the consumption current control circuit. During slow transitions or steady states, the system maintains low power consumption. This dynamic approach ensures high slew rate performance is available when needed while minimizing power consumption during normal operation.

The patent changes the consumption current parameter dynamically based on operating conditions. By comparing voltage differences and adjusting the consumption current accordingly, the system adapts its power delivery characteristics to match the actual driving requirements, achieving both low power consumption and high slew rate performance when necessary.