Brightness Compensation for VRR Display Flickering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display equipment using variable refresh rate (VRR) technology experiences screen flickering due to brightness differences among video frames caused by leakage current in liquid crystal display panels, as the brightness of video frames with longer frame durations decreases over time.
Innovation Solution
A brightness compensation device with a VRR detection circuit and control circuit that detects the blanking period of VRR video frames and repeatedly outputs frame data during this period to maintain consistent brightness, supplementing the charge leaked from liquid crystal pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VRR technology is applied to display equipment, then frame loss is prevented, but screen flickering occurs due to brightness differences among video frames with different frame durations
Solution Approach 1:
The patent applies periodic action by repeatedly outputting frame data during the blanking period of VRR video frames. The control circuit detects the blanking period and continuously refreshes the display device with the same frame data during this period, creating a periodic refresh action that compensates for brightness decay caused by leakage current and maintains consistent brightness across frames with different durations
Solution Approach 2:
The patent applies preliminary action by proactively refreshing the display device during the blanking period before the next valid frame data arrives. By detecting the blanking period in advance and preemptively repeating frame data output, the system compensates for brightness decay before it becomes visually noticeable, preventing flickering rather than correcting it after occurrence
2Loss of time
If frame duration is extended for VRR video frames, then more processing time is available, but brightness decreases due to leakage current in liquid crystal pixels
Solution Approach 1:
The patent applies continuity of useful action by maintaining continuous frame data output to the display device throughout the entire frame period, including during the blanking period. Instead of stopping data output during blanking, the control circuit continuously repeats the frame data, ensuring the display device receives uninterrupted refresh signals that counteract leakage current effects and maintain brightness consistency regardless of frame duration variations
Data Source
AI summary
The disclosure provides a display equipment, a brightness compensation device, and a brightness compensation method. The brightness compensation device includes a variable refresh rate (VRR) detection circuit and a control circuit. The VRR detection circuit and the control circuit receive a video stream from a video source device, and the video stream includes a VRR video frame. The VRR detection circuit detects a blanking period of the VRR video frame and generates a detection result. The control circuit outputs the frame data of the VRR video frame to the display device during the valid data period of the VRR video frame. The control circuit repeatedly outputs the frame data of the VRR video frame to the display device during the blanking period of the VRR video frame according to the detection result until the blanking period ends.