Adaptive Backlight Smoothing to Reduce Flicker
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Solution Overview
Problem
Dynamic Backlight Control systems face challenges in adjusting backlight illumination effectively, leading to flicker and visual artifacts due to mismatched color and luminance between images and modified displays, particularly when handling fast or slow-changing image sequences.
Innovation Solution
An adaptive transition rate module calculates an adaptive parameter based on the magnitude of change between frames, determining a smoothing function to modify backlight control signals, allowing for intelligent adjustment of backlight illumination to minimize visual artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dynamic backlight control adjusts backlight illumination frame-by-frame, then image quality and color accuracy are improved, but flicker and visual artifacts occur due to mismatched color and luminance
Solution Approach 1:
The patent applies dynamics by making the transition rate adaptive rather than fixed. The system dynamically adjusts the backlight transition rate based on the magnitude of change between frames, using a decay rate parameter that varies with the backlight delta. This allows the system to optimize between image quality and flicker reduction in real-time.
Solution Approach 2:
The patent changes the parameter of transition rate from a constant value to an adaptive parameter that depends on the backlight delta magnitude. By introducing a decay rate that varies with the change magnitude, the system adjusts the smoothing behavior to resolve the contradiction between image quality and flicker.
2Speed
If backlight transition rate is increased for fast-changing sequences, then response speed is improved, but visual artifacts and flicker increase
Solution Approach 1:
The system dynamically adjusts the transition rate based on the sequence type. For fast-changing sequences, a higher transition rate is used to maintain response speed, while for slow-changing sequences, a lower transition rate reduces visual artifacts. The adaptive decay rate enables this dynamic behavior.
Solution Approach 2:
The transition rate parameter is changed from fixed to adaptive, depending on the backlight delta magnitude. The decay rate parameter varies with the change magnitude, allowing the system to optimize transition speed versus artifact reduction based on the specific sequence characteristics.
3Object-affected harmful factors
If backlight transition rate is decreased for slow-changing sequences, then flicker is reduced, but transition response becomes too slow
Solution Approach 1:
The system dynamically selects the appropriate transition rate based on the sequence type. For slow-changing sequences, it uses a lower transition rate to reduce flicker, while for fast-changing sequences, it increases the transition rate to maintain responsiveness. The adaptive decay rate enables this context-aware adjustment.
Solution Approach 2:
The transition rate parameter is adaptively changed based on the backlight delta magnitude. By introducing a decay rate that varies with change magnitude, the system resolves the contradiction between flicker reduction and transition speed for different sequence types.
4Device complexity
If constant smoothing function is used for all frames, then implementation is simplified, but image quality degrades for fast-changing sequences
Solution Approach 1:
The patent transforms the static smoothing function into a dynamic one that adapts to sequence characteristics. Instead of using a constant smoothing function, the system varies the decay rate based on the backlight delta magnitude, enabling optimal image quality for both fast and slow-changing sequences.
Solution Approach 2:
The smoothing function parameters are changed from constant to adaptive. The decay rate parameter varies with the backlight delta magnitude, allowing the system to maintain image quality across different sequence types while managing complexity through a systematic adaptation approach.
Data Source
AI summary
A method and apparatus for adaptively controlling the backlight to reduce flicker in a display is provided. The apparatus includes a display, a backlight providing illumination for said display, a backlight control module for providing backlight control signals to said backlight, and an adaptive transition rate module. The module calculates an adaptive parameter based on a magnitude of change between backlight requirements for two frames, determining a smoothing function based on the adaptive parameter, and using said smoothing function to modify said backlight control signals. Techniques for adaptively controlling the illumination of the backlight according to the difference in the illumination levels of two different sets of image data are also disclosed.