Backlight Control for Display Devices to Prevent Black Floating
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Solution Overview
Problem
Conventional display devices face issues with 'black floating' and insufficient brightness when white and black pixels coexist, leading to visually unpleasant sensations due to the inability to accurately control backlight brightness across segmented regions.
Innovation Solution
A display device with a backlight unit comprising multiple light sources on a back surface, equipped with detection units to analyze image characteristics of each region and the overall screen, determining optimal emission brightness for each light source to balance brightness and prevent 'black floating'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight is set to high brightness to display white pixels, then the brightness of white regions is improved, but black pixels become insufficiently dark causing black floating
Solution Approach 1:
The backlight unit is divided into multiple independent light sources corresponding to different segmented regions of the display panel. Each light source can be controlled independently to emit light at different brightness levels, allowing the system to illuminate only the regions requiring brightness while keeping other regions dark, thus preventing black floating in high-contrast images
Solution Approach 2:
Different regions of the display panel are assigned different brightness characteristics based on their local image content. The drive unit determines the emission brightness of each light source individually according to the image characteristics of its corresponding region, enabling local optimization where bright regions receive high illumination and dark regions receive low or no illumination
2Object-affected harmful factors
If the backlight is set to low brightness to prevent black floating, then black pixel display is improved, but white pixels become insufficiently bright
Solution Approach 1:
The backlight unit is divided into multiple independent light sources corresponding to different segmented regions of the display panel. Each light source can be controlled independently to emit light at different brightness levels, allowing the system to illuminate only the regions requiring brightness while keeping other regions dark, thus preventing black floating in high-contrast images
Solution Approach 2:
The emission brightness of each light source is dynamically adjusted based on the image characteristics of its corresponding segmented region. The drive unit continuously determines optimal brightness levels for each light source according to real-time image content, transitioning between high brightness for white regions and low brightness for black regions
3Illumination intensity
If the display screen is divided into multiple regions with different brightness control, then local brightness optimization is improved, but visually unpleasant sensation between regions occurs
Solution Approach 1:
The system incorporates detection units that detect image characteristics of each segmented region and provide feedback to the drive unit. Based on this feedback, the drive unit determines appropriate emission brightness for each light source, automatically adjusting regional brightness to match actual image content and avoiding artificial brightness boundaries that cause visual discomfort
Solution Approach 2:
The emission brightness parameter of each light source is dynamically changed based on detected image characteristics. By adjusting the brightness parameter according to actual image content rather than fixed regional divisions, the system achieves local optimization without creating visible brightness transitions between regions
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
The solution effectively inhibits 'black floating' and ensures appropriate brightness, reducing visually unpleasant sensations by dynamically adjusting light source brightness based on detected image characteristics.
Implementation Method 1
a backlight unit which is disposed on a back surface of the display panel, and which includes a plurality of light sources for each region obtained by dividing the display panel into a plurality of regions
Data Source
AI summary
Provided is a display device capable of reducing a visually unpleasant sensation experienced by a user. This display device includes a display panel displaying a video picture, a backlight unit disposed on a back surface of the display panel and including a light sources for each region obtained by dividing the display panel into regions, a region characteristic amount detection unit detecting a characteristic amount of an image of each of the divided regions, a full screen characteristic amount detection unit detecting a characteristic amount of an image of the overall display panel, a region brightness determination unit determining an emission brightness of the respective light sources corresponding to each of the regions based on the detected characteristic amount, and the detected characteristic amount of the image of the overall display panel, and a backlight drive unit driving the respective light sources to emit light at the determined emission brightness.