Display Refresh Cycle Control for Flicker-Free Brightness Switching
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Solution Overview
Problem
Existing display technologies face issues with brightness differences and flickering when changing refresh rates, leading to an unnatural viewing experience due to mismatched duty cycles and gamma values at different frequencies.
Innovation Solution
The system adjusts the frequency operation cycle by determining a common divisor for refresh rates to synchronize duty cycles, incorporating black periods, and dynamically changing refresh rates based on events such as user inputs or application usage to maintain consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the display refresh rate is changed from 60 Hz to 90 Hz, then the display smoothness is improved, but brightness difference and flickering occur due to mismatched gamma values
Solution Approach 1:
The patent changes the gamma value parameter according to the refresh rate. When switching from 60 Hz to 90 Hz, the system selects a gamma value optimized for 90 Hz operation, ensuring consistent brightness perception across different refresh rates. This parameter adaptation resolves the brightness mismatch caused by frequency changes.
Solution Approach 2:
The system dynamically adjusts display parameters including gamma values and duty cycles based on the current refresh rate. This dynamic adaptation allows the display to maintain optimal performance and visual consistency whether operating at 60 Hz, 90 Hz, or other refresh rates, preventing flickering and brightness artifacts.
2Device complexity
If the number of duty cycles is kept constant across different refresh rates, then the control logic is simplified, but brightness differences and flickering occur
Solution Approach 1:
The patent modifies the duty cycle parameter based on the refresh rate. At 90 Hz, a different number of duty cycles is used compared to 60 Hz operation. This parameter adjustment ensures that the total light emission duration remains appropriate for each frequency, maintaining brightness consistency while adapting to the changed refresh rate requirements.
3Speed
If the display operates at higher refresh rates continuously, then the display smoothness is improved, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the refresh rate based on operational conditions and content requirements. Rather than continuously operating at the maximum 90 Hz, the display adapts its refresh rate to match the actual needs of the content being displayed, reducing power consumption during static or low-change scenarios while maintaining smoothness when needed.
Solution Approach 2:
The display implements periodic refresh cycles with variable duty cycles. By controlling the on/off timing of pixel subsets in periodic patterns adapted to the refresh rate, the system achieves smooth visual output at higher frequencies while managing power consumption through controlled illumination periods rather than continuous operation.
Data Source
AI summary
Various embodiments disclose a method and an apparatus including a display, a memory including information on a number of duty cycles per one refresh period for emitting light by pixels of the display corresponding to each of a plurality of refresh rates of the display, and a processor, wherein the processor is configured to control the electronic device to perform an operation according to a first number of duty cycles based on the display operating at a first refresh rate, and perform an operation according to a second number of duty cycles based on the display operating at a second refresh rate, wherein the first number is less than the second number based on the first refresh rate being higher than the second refresh rate.