Backlight Control for Display Black Floating Prevention
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Solution Overview
Problem
Display devices with backlight LEDs suffer from 'black floating' phenomena, where luminance differences between adjacent regions cause visibility issues, especially when displaying high-saturation images, due to varying backlight intensity.
Innovation Solution
A display device with light sources arranged across partial regions, a light amount correction processing unit that detects continuous non-display regions and adjusts light levels based on a predetermined threshold, and a light source control unit to maintain consistent light levels between adjacent regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight intensity is increased to improve image brightness and saturation, then the luminance difference between adjacent regions increases causing black floating phenomenon, but the image quality deteriorates
Solution Approach 1:
The patent applies local quality by dividing the backlight into multiple independently controllable light sources corresponding to different partial regions. Each light source's intensity is adjusted locally based on the image content in its corresponding region, allowing high saturation regions to receive higher intensity while black screen regions receive reduced intensity, thereby preventing black floating while maintaining image quality
Solution Approach 2:
The patent changes the illumination parameter (light intensity) dynamically based on image characteristics. By calculating luminance distribution and detecting black screen regions, the system adjusts the intensity parameter of each light source individually, transforming the uniform illumination into variable illumination that adapts to local image requirements, thus resolving the black floating issue
2Loss of energy
If the backlight intensity is reduced to prevent black floating, then power consumption decreases, but the overall image brightness and contrast are compromised
Solution Approach 1:
The system applies local quality by selectively adjusting light intensity in different regions rather than uniformly reducing backlight across the entire display. High-saturation regions maintain higher brightness while black screen regions use reduced intensity, optimizing power consumption locally without sacrificing overall image quality
Solution Approach 2:
The patent applies partial action by activating or intensifying only the specific light sources corresponding to regions displaying high-saturation images, while reducing or turning off light sources for black screen regions. This partial illumination strategy reduces total power consumption while maintaining necessary brightness where required
3Object-affected harmful factors
If the backlight is divided into multiple light sources for regional control, then black floating is prevented through localized adjustment, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the backlight into multiple discrete light sources, each corresponding to a specific partial region of the display. This segmentation enables independent control of each region's illumination, allowing precise prevention of black floating through localized intensity adjustment without requiring complex global control mechanisms
Solution Approach 2:
The system applies self-service by automatically detecting black screen regions and calculating luminance distribution, then autonomously adjusting each light source's intensity without requiring manual intervention or complex external control systems. The display device itself performs the optimization, simplifying the overall control architecture
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
Prevents black floating by ensuring consistent light levels across the display, enhancing image quality and reducing power consumption while maintaining luminance.
Implementation Method 1
display devices have been developed that include a plurality of light-emitting diodes (LEDs) as a linear light source used as a backlight
Data Source
AI summary
A display device includes: an image display unit that includes an image display region; a plurality of light sources that are arranged corresponding to a plurality of partial regions included in the image display region and irradiate the partial regions with light; a light amount correction processing unit that detects that the partial regions are non-display regions in which no image is displayed, and corrects a light amount of the light sources based on a predetermined threshold when the partial regions adjacent to each other are continuous non-display regions; and a light source control unit that controls the light amount of the light sources.