Display Backlight Control for Flicker-Free Variable Refresh Rates
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Solution Overview
Problem
Display apparatuses face flickering issues due to changes in refresh rates, which affect user experience by altering brightness, as they need to adapt to variable frame rates from graphics processing units (GPUs) without maintaining consistent display brightness.
Innovation Solution
A display apparatus and method that dynamically adjust display parameters such as Gamma voltages and backlight brightness by calculating adjustment coefficients based on real-time refresh rates, using formulas like K=AH_1F-tr2, to maintain consistent display brightness across varying refresh rates, thereby avoiding flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the refresh rate of the display panel is changed to match variable frame rates from the GPU, then the display fluency is improved, but the display brightness becomes unstable causing flickering
Solution Approach 1:
The patent dynamically adjusts display parameters (Gamma voltages and backlight brightness) based on the current refresh rate. When the refresh rate changes to match variable GPU frame rates, the system calculates adjustment coefficients and modifies Gamma voltages and backlight duty cycles accordingly. This parameter adaptation ensures that display brightness remains stable even as refresh rate varies, resolving the flickering issue while maintaining smooth display fluency.
2Adaptability or versatility
If variable refresh rates are implemented to adapt to GPU frame rate changes, then display smoothness is improved, but display brightness consistency deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the display system continuously monitors the actual refresh rate and adjusts display parameters accordingly. The mainboard acquires the refresh rate of to-be-displayed video data, generates appropriate Gamma voltages and backlight control signals based on this refresh rate, and sends them to the display panel. This closed-loop control ensures that brightness consistency is maintained across different refresh rates, allowing the system to adapt to variable GPU frame rates without sacrificing brightness uniformity.
3Productivity
If the refresh rate is dynamically adjusted to match GPU output, then display fluency is improved, but flickering occurs due to brightness changes
Solution Approach 1:
The patent applies preliminary anti-action by pre-calculating and applying compensation measures before flickering can occur. When the refresh rate is adjusted to match variable GPU frame rates, the system proactively adjusts Gamma voltages and backlight brightness using calculated adjustment coefficients. This preventive adjustment counteracts the potential brightness fluctuations that would otherwise cause flickering, allowing the display to maintain fluency without generating harmful flickering effects.
Data Source
AI summary
The present application provides a display apparatus and a control method therefor. The display apparatus includes a mainboard, a power board, and a display panel, where the mainboard acquires a refresh rate of to-be-displayed video data, and adjusts a backlight control signal according to the refresh rate; and the power board drives a backlight source of the display panel according to the received backlight control signal.