Timing Controller VBK Power Management
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Solution Overview
Problem
Current display systems with variable refresh rate (VRR) and low refresh rate (LRR) technologies face limitations in power saving due to the continuous operation of control circuits at fixed frequencies, despite reduced frame refresh rates, which hampers further power efficiency improvements.
Innovation Solution
A display system comprising a display panel, a source driver, and a timing controller that detects the vertical blanking period and turns off the transmission interface circuit to idle the source driver during this period, waking it up only at a preset time before the end of the blanking period, thereby reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the frame refresh rate is reduced to save power, then power consumption decreases, but the control circuit still operates at the original frequency limiting further power saving
Solution Approach 1:
The control circuit's operating frequency is made dynamic rather than fixed. The timing controller adjusts its operating frequency to match the display panel's refresh rate, allowing it to operate at lower frequencies during low refresh rate periods, thereby enabling additional power savings beyond what the display panel alone achieves
Solution Approach 2:
The operating frequency parameter of the control circuit is changed dynamically based on the refresh rate requirements. By adjusting the frequency parameter to match the actual display needs, the system avoids unnecessary high-frequency operation and achieves improved power efficiency
2Reliability
If the transmission interface circuit remains on during VBK period, then signal transmission is ready, but power consumption increases
Solution Approach 1:
The transmission interface circuit operates periodically rather than continuously. It is activated during active display periods and turned off during vertical blanking periods, creating a periodic on-off pattern that matches the display refresh cycle, thereby reducing power consumption while maintaining operational readiness when needed
Solution Approach 2:
The timing controller activates the transmission interface circuit at a preset time before the end of the VBK period, ensuring the circuit is ready before the next active display period begins. This preliminary activation ensures smooth transition and signal readiness without requiring the circuit to remain continuously active
Data Source
AI summary
A display system and an operating method thereof are provided. The display system includes a display panel, a source driver, and a timing controller. The source driver is coupled to the display panel for providing a plurality of pixel voltages to the display panel. The timing controller has a transmission interface circuit and is coupled to the source driver. The timing controller detects whether an operation timing of the display system enters a vertical blanking (VBK) period. When the operation timing of the display system enters the VBK period, the timing controller turns off the transmission interface circuit and causes the source driver to enter an idle mode. When the operation timing of the display system is at a preset time before an end of the VBK period, the timing controller turns on the transmission interface circuit and wakes up the source driver.