LED Backlight Luminance Control for Flicker Reduction
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Solution Overview
Problem
Existing display devices using LED backlights experience noticeable flicker when displaying moving images, particularly when objects move at lower velocities, and suffer from reduced luminance when objects move at higher velocities, leading to suboptimal image quality.
Innovation Solution
A display device with a two-dimensionally arranged LED backlight system that detects the moving velocity of objects in a video and automatically controls luminance variations for each LED, allowing for individual modulation to minimize flicker and maintain luminance, using a combination of moving velocity detection units and luminance variation control mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED devices are controlled in divided areas to reduce power consumption, then power consumption is reduced, but light emission luminance varies causing flicker
Solution Approach 1:
The patent applies dynamics by making the backlight luminance adjustable and adaptive rather than static. The system dynamically changes the luminance of divided backlight areas based on the detected moving velocity of objects in the video, allowing the backlight to adapt its characteristics to match the content being displayed, thereby resolving the contradiction between power savings and luminance stability
Solution Approach 2:
The patent changes the luminance parameter of the backlight based on object moving velocity. By detecting whether objects move at high or low velocity and相应ly adjusting the backlight luminance, the system optimizes both power consumption and image quality, eliminating flicker while maintaining energy efficiency
2Use of energy by moving object
If LED luminance is reduced for power saving, then power consumption decreases, but flicker becomes noticeable in moving images
Solution Approach 1:
The patent implements feedback by detecting the moving velocity of objects in the video and using this information to control the backlight luminance. This closed-loop control ensures that the backlight adjusts appropriately to prevent flicker while maintaining power efficiency, directly addressing the harmful effect of flicker
Solution Approach 2:
The system dynamically adjusts backlight luminance based on real-time detection of object motion velocity, making the backlight adaptive to content characteristics. This dynamic adjustment prevents flicker in moving images while preserving power consumption benefits
3Object-affected harmful factors
If LED devices are constantly turned on to avoid flicker in still images, then flicker is avoided, but power consumption increases
Solution Approach 1:
The patent applies partial action by controlling only the necessary backlight areas and adjusting luminance to the minimum required level based on object velocity. Instead of constantly maintaining full luminance across all areas, the system applies just enough light to prevent flicker, reducing unnecessary power consumption
Solution Approach 2:
The system changes the backlight luminance parameter dynamically based on detected object velocity, allowing it to reduce power consumption while maintaining flicker-free operation by adjusting luminance to match the motion characteristics of the displayed content
4Illumination intensity
If luminance variation is increased for high velocity objects, then image quality improves, but flicker control becomes challenging
Solution Approach 1:
The patent directly addresses this contradiction by changing the luminance parameter based on object velocity. For high velocity objects, the system increases luminance to maintain image quality, while for low velocity objects, it reduces luminance variation to control flicker, optimizing both qualities simultaneously through velocity-based parameter adjustment
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 reduces flicker and maintains luminance, resulting in improved image quality by adjusting luminance variations based on object velocity, whether moving at high or low speeds, thereby enhancing the overall display performance.
Implementation Method 1
a backlight using a light emitting diode (LED) device
Data Source
AI summary
Provided is a display device capable of producing an image of excellent quality with reduced flicker and little reduction in luminance, the display device including: a backlight having light sources such as LED devices arranged two-dimensionally, each of which may be individually modulated in luminance; a moving velocity detection unit VD1 (109) for detecting a moving velocity of an object in a video (for example, moving velocity of a foreground); and a luminance variation control unit (113) for automatically controlling luminance variations of the LED devices for each frame, in accordance with the moving velocity.