Backlight Diffusion Compensation for LCD Image Quality
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Solution Overview
Problem
Current liquid crystal display (LCD) devices with local dimming technology face challenges in accurately modeling backlight diffusion, leading to image distortion and inadequate compensation, especially with limited luminance levels of backlight sources compared to grayscale levels of images, which affects display quality and power consumption.
Innovation Solution
A method and apparatus that determine set backlight values for each area based on image grayscale, calculate equivalent backlight luminance for each pixel using diffusion transmission parameters, and adjust backlight sources accordingly to create a compensation image, effectively modeling backlight diffusion and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming technology is used to reduce power consumption, then energy efficiency improves, but image quality and display precision deteriorate due to inadequate backlight diffusion modeling
Solution Approach 1:
The patent applies parameter changes by using diffusion transmission parameters to model and characterize backlight diffusion behavior. By adjusting and optimizing parameters such as diffusion coefficients and transmission characteristics, the system achieves accurate compensation for local dimming effects, thereby maintaining image quality while reducing power consumption.
Solution Approach 2:
The patent implements feedback mechanisms through compensation images that are generated based on calculated equivalent backlight luminance. The system continuously adjusts the display signal by incorporating compensation data derived from backlight diffusion modeling, ensuring that image quality is maintained despite local dimming operations.
2Illumination intensity
If local dimming is applied to improve contrast, then image contrast improves, but image distortion occurs due to inaccurate backlight compensation
Solution Approach 1:
The patent replaces traditional mechanical or empirical backlight compensation methods with a computational approach. By using diffusion transmission parameters and mathematical modeling to calculate equivalent backlight luminance and generate compensation images, the system achieves accurate contrast enhancement without the image distortion associated with conventional methods.
Solution Approach 2:
The patent utilizes parameter changes by modeling backlight diffusion through diffusion transmission parameters. By dynamically adjusting compensation parameters based on calculated equivalent luminance values, the system maintains accurate image representation while achieving the desired contrast improvement through local dimming.
3Device complexity
If limited luminance levels of backlight sources are used, then device complexity reduces, but manufacturing precision deteriorates due to insufficient grayscale representation
Solution Approach 1:
The patent introduces compensation images as an intermediary element between the limited-luminance backlight sources and the final display output. By calculating equivalent backlight luminance and generating compensation data, the system bridges the gap between coarse backlight control levels and fine grayscale requirements, enabling high-precision grayscale representation without increasing backlight source complexity.
Solution Approach 2:
The patent applies parameter changes by transforming the limited backlight luminance values into equivalent luminance parameters through diffusion modeling. This parameter transformation allows the system to represent fine grayscale levels in the final image using coarse backlight control, thereby maintaining low device complexity while achieving high manufacturing precision.
Data Source
AI summary
A display control method and apparatus of backlight sources, and a display device are provided. The method includes: determining a set backlight value of each backlight area according to a grayscale of an image to be displayed; determining an equivalent backlight luminance of each pixel point according to backlight source diffusion transmission parameter of the backlight module of the display device and the set backlight value of each backlight area; determining a compensation image according to the equivalent backlight luminance of each pixel point; and controlling the backlight module to turn on the backlight sources according to the set backlight value of each backlight area, and controlling the display panel to display the image according to the compensation image.