Preemptive Refresh for Display Judder Reduction
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Solution Overview
Problem
Electronic displays experience visual artifacts such as judder and latency due to frame repeats, especially in priority content sources like user interfaces and video conferencing, which can degrade image quality and battery life, and existing solutions either increase power consumption or fail to eliminate judder completely.
Innovation Solution
Implementing a preemptive refresh technique that adds a fixed amount of latency to each image frame and using variable refresh rate displays to prioritize content sources, applying static and dynamic partitioning techniques to ensure timely image frame updates, thereby reducing judder and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame repeats are used to maintain image quality over time, then image quality degradation is reduced, but visual artifacts such as judder and latency increase
Solution Approach 1:
The patent applies preliminary action by preemptively triggering frame repeats before they would normally occur. The system monitors the timing of incoming image frames and proactively schedules frame repeats at optimal moments to prevent judder and latency artifacts before they can manifest visually. This is achieved by calculating the time remaining until the next frame is received and triggering the frame repeat accordingly, rather than waiting for artifacts to occur and then attempting to correct them.
2Object-generated harmful factors
If fixed high refresh rate is used to eliminate judder, then visual artifacts are reduced, but power consumption increases
Solution Approach 1:
The patent implements dynamics by making the refresh rate adaptive rather than fixed. The system dynamically adjusts the refresh rate based on the actual timing of incoming image frames and the current display state. When frame repeats are needed to prevent judder, the system triggers them at optimal moments rather than continuously running at maximum refresh rate. This dynamic approach allows the display to maintain low power consumption while still preventing visual artifacts when necessary.
Solution Approach 2:
The patent applies parameter changes by modifying the refresh rate parameter dynamically based on system conditions. Instead of operating at a fixed high refresh rate, the system changes the refresh rate parameter in response to frame timing conditions and display state. This allows the system to maintain image quality and prevent judder when needed while reducing power consumption during periods when frame repeats are not necessary.
3Use of energy by stationary object
If variable refresh rate is used to save power, then power consumption is reduced, but timing accuracy and frame synchronization deteriorate
Solution Approach 1:
The patent implements feedback by continuously monitoring the timing of incoming image frames and using this information to adjust frame repeat scheduling. The system measures the actual time between frames and uses this feedback to optimize when frame repeats should occur. This feedback mechanism ensures that frame repeats are triggered at the correct moments to maintain timing accuracy and synchronization, even when variable refresh rates are used to save power.
Data Source
AI summary
In an embodiment, an electronic device includes an electronic display. The electronic display provides a programmable latency period in response to receiving a first image frame corresponding to first image frame data. The electronic display also displays the first image frame after the programmable latency period and during display of the first image frame, receives a second image frame corresponding to second image frame data. The electronic display also repeats display of the first image frame in response to receiving the second image frame.