Backlight Control via Moving Black Image Segmentation
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Solution Overview
Problem
Current backlight control methods for LED displays face inefficiencies in data transmission and suboptimal backlight effects due to high data frequency requirements and visual artifacts from black frame insertion.
Innovation Solution
The method involves splitting a display frame into multiple dimming control frames, where each frame consists of a black image and a partial dimming image, with the positions of black images moving in a preset direction, and further subdividing frames into sub-frames or small sub-frames to adjust for frequency abnormalities, using PWM signals to control LED drivers for improved efficiency and effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If black frame insertion is used to improve backlight control, then display effects are enhanced, but visual artifacts appear due to high data frequency requirements
Solution Approach 1:
The patent divides a single display frame into multiple dimming control frames, where each frame contains a black image portion and a partial dimming image portion. This segmentation allows the backlight to be controlled at higher frequencies without requiring the entire display system to operate at high data rates, thereby improving backlight control effectiveness while avoiding visual artifacts associated with high-frequency black frame insertion.
Solution Approach 2:
The patent applies different image content to different portions of each frame: black images are used in specific regions where backlight dimming is needed, while partial dimming images are used in other regions. This local differentiation allows precise backlight control in targeted areas without affecting the overall display quality, thus enhancing backlight control effects while minimizing visual artifacts.
2Measurement precision
If data transmission frequency is increased to improve backlight control precision, then control accuracy is enhanced, but data transmission efficiency decreases
Solution Approach 1:
By segmenting the display frame into multiple dimming control frames with varying black image and partial dimming image portions, the patent enables progressive backlight dimming control. This allows the backlight to be controlled at effectively higher frequencies through temporal multiplexing, improving control precision without requiring proportionally higher data transmission frequencies, thus maintaining data transmission efficiency.
3Speed
If black frame insertion frequency is increased to improve backlight response, then backlight response time is reduced, but visual artifacts become more prominent
Solution Approach 1:
The patent uses black images in specific portions of dimming control frames rather than inserting complete black frames. This local application of black images allows the backlight to respond quickly in targeted areas while maintaining image content in other areas, achieving fast backlight response times without the prominent visual artifacts that would result from frequent full-frame black insertions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces data transmission requirements, enhances backlight control frequency, and alleviates visual artifacts, resulting in improved display effects and transmission efficiency.
Implementation Method 1
The backlight module is controlled by a plurality of LED drivers through pulse width modulation (PWM) signals
Implementation Method 2
The backlight module may be composed of a large number of light emitting diodes (LEDs)
Data Source
AI summary
Provided are a backlight control method, a device, and a storage medium, where the method includes: acquiring a dimming image corresponding to a display frame sent by a controller, the dimming image matching a display image on a liquid crystal panel; splitting, according to the dimming image, one display frame into a plurality of dimming control frames to control LEDs in a backlight module; where an image corresponding to each dimming control frame is composed of a black image and a partial dimming image which are spliced, and in the plurality of dimming control frames, positions of black images move in a preset direction.