Display Driver Bias Current Control for Power Reduction
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Solution Overview
Problem
Traditional display driver ICs with high frame rates consume excess power when used in low frame rate or low bit rate scenarios due to fixed high drive capability and bias current settings.
Innovation Solution
A display driver with a bias current control circuit that adjusts the bias current of the high-speed receiver (HS-RX) based on the computed bit rate of the image data, optimizing power consumption by dynamically adjusting the bias current according to the bit rate.
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) to support the highest MIPI transmission speed, then the transmission speed and anti-interference capability are improved, but the power consumption increases excessively when applied in low frame rate or low bit rate scenarios
Solution Approach 1:
The patent implements dynamic adjustment of the HS-RX bias current based on the actual data transmission rate. The system transitions from a fixed high-current configuration to a variable current configuration that adapts to different operating conditions (high frame rate vs. low frame rate scenarios), thereby reducing power consumption when maximum transmission speed is not required while maintaining the capability to operate at high speeds when needed
Solution Approach 2:
The patent changes the bias current parameter of the HS-RX circuit based on the detected bit rate. By computing the data bit rate and adjusting the bias current accordingly (higher current for high bit rates, lower current for low bit rates), the system optimizes the trade-off between transmission performance and power consumption across different operating scenarios
2Reliability
If HSRX is configured with fixed high bias current to ensure high anti-interference capability, then the signal reliability is improved, but the power consumption increases unnecessarily in low bit rate scenarios
Solution Approach 1:
The system dynamically adjusts the bias current level based on the actual transmission requirements. When the bit rate is low, the bias current is reduced while maintaining sufficient anti-interference capability for the current data rate, thereby eliminating unnecessary power consumption while preserving adequate signal reliability
Solution Approach 2:
The bias current parameter is adjusted according to the computed bit rate, creating a proportional relationship between current level and transmission requirements. This ensures that the anti-interference capability is optimized for each operating condition rather than being over-provisioned in all scenarios
Data Source
AI summary
An display driver and an operating method of the display driver are provided. The display driver includes a receiver comprising a bias current control circuit. The receiver receives image data. The bias current control circuit computes a data bit rate of the image data, and adjusting a bias current of the receiver according to the data bit rate. The operating method is adapted to the display driver.