Display Driver Receiver Bias Current Control for Power Optimization
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Solution Overview
Problem
Traditional MIPI HS-RX drivers consume excess power when operating at low frame rates or bit rates due to fixed high drive capability and bias current settings, leading to inefficient power management.
Innovation Solution
A display driver receiver with a bias current control circuit that adjusts the bias current based on the data rate of the image data, using an operational amplifier and input interface to dynamically manage power consumption by switching between different bias current settings based on computed bit rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If HSRX is set to drive with high-speed reception capability (high drive capability, high anti-interference, high bias current), then the transmission speed and anti-interference capability are improved, but the power consumption increases excessively when operating at low frame rates or low bit rates
Solution Approach 1:
The bias current control circuit dynamically adjusts the bias current of the operational amplifier based on the data rate of incoming image data. When the data rate indicates low frame rate or low bit rate operation, the circuit reduces the bias current from the fixed high level, thereby lowering power consumption while maintaining adequate reception capability for the current operating conditions.
Solution Approach 2:
The system changes the bias current parameter of the operational amplifier according to the data rate. By detecting the data rate and adjusting the bias current accordingly, the system optimizes the balance between reception performance and power consumption, avoiding excessive power expenditure during low-rate operations while maintaining high-speed capability when needed.
2Reliability
If HSRX is configured with fixed high bias current for high-speed reception, then the anti-interference capability is improved, but the power consumption increases unnecessarily during low frame rate operations
Solution Approach 1:
The bias current control circuit provides dynamic adjustment of the operational amplifier's bias current based on actual operating conditions (data rate). This allows the system to maintain sufficient anti-interference capability matched to the current data rate while avoiding the excessive power consumption associated with fixed high bias current settings during low frame rate operations.
Solution Approach 2:
The system adjusts the bias current parameter dynamically according to the data rate of image data being received. This parameter adaptation ensures that the anti-interference capability remains adequate for the current operating conditions without incurring unnecessary power consumption during low frame rate or low bit rate operations.
Data Source
AI summary
A receiver of a display driver and an operating method of the receiver of the display driver are provided. The receiver of the display driver includes an input interface, an operational amplifier and a bias current control circuit. The input interface receives image data. The operational amplifier is coupled to the input interface and includes a bias current circuit. The bias current control circuit adjusts a bias current of the bias current circuit according to a data rate of the image data. The operating method is adapted to the receiver of the display driver.