Backlight Diffusion Parameter Acquisition for LCD Local Dimming
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Solution Overview
Problem
The local dimming technology in liquid crystal display devices struggles to effectively compensate for varying backlight luminance, leading to suboptimal display effects due to inadequate modeling of backlight diffusion transmission parameters.
Innovation Solution
A method is introduced to acquire backlight diffusion transmission parameters by measuring light diffusion data, preprocessing to determine effective pixel points, fitting the data to obtain a point spread function, and using this function to calculate equivalent backlight luminance values for precise LCD image compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming technology is applied to reduce backlight power consumption, then power consumption is reduced and image contrast is improved, but the luminance of respective backlight sources becomes quite different from each other and the LCD compensation cannot effectively compensate for the backlight variation
Solution Approach 1:
The backlight is divided into multiple independently controllable backlight sources arranged in different backlight regions. Each backlight source can be individually adjusted to emit different luminance levels, enabling local dimming to reduce overall power consumption while maintaining display quality through selective region dimming.
Solution Approach 2:
The patent replaces physical backlight uniformity with a computational compensation system. By measuring actual luminance values of each backlight source and calculating diffusion transmission parameters, the system generates compensation images that optically compensate for backlight variations, substituting mechanical uniformity with algorithmic correction.
2Illumination intensity
If local dimming is applied to improve image contrast, then image contrast is improved, but the final display effect is adversely affected due to inability to effectively compensate backlight variation
Solution Approach 1:
The patent implements a feedback mechanism by measuring the actual luminance values of each backlight source using a luminance measuring instrument. These measured values are fed back into the compensation calculation process to determine diffusion transmission parameters, ensuring that the compensation image accurately reflects the actual backlight state and maintains display quality.
Solution Approach 2:
The patent changes the parameter representation from direct backlight control to diffusion transmission parameters. By measuring luminance values at multiple pixel points and fitting a point spread function y=ƒ(x), the system transforms discrete backlight control parameters into a continuous diffusion model that accurately represents light propagation and enables precise compensation.
3Measurement precision
If backlight diffusion transmission parameter modeling is improved to enable effective compensation, then display quality is improved, but the complexity of measuring and fitting light diffusion data increases
Solution Approach 1:
The measurement process is segmented into systematic steps: selecting multiple backlight sources, measuring luminance at multiple pixel points for each source, preprocessing to identify effective pixel points, and fitting point spread functions. This segmentation makes the complex measurement process manageable and systematic.
Solution Approach 2:
The patent creates a computational model (point spread function y=ƒ(x)) that copies and represents the physical light diffusion process. This mathematical model serves as a simplified representation of the complex optical phenomenon, enabling accurate compensation calculations without requiring complex physical measurements during operation.
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 allows for precise modeling of backlight diffusion, improving image display quality by accurately calculating equivalent backlight luminance values and enhancing contrast and image fidelity.
Implementation Method 1
measuring a light diffusion data for each of the plurality of backlight sources, where the light diffusion data includes luminance values of a plurality of pixel points of a screen of the display device and a distance between a position of each pixel point and a position of a certain backlight source
Data Source
AI summary
A method for acquiring backlight diffusion transmission parameter, a display control method and a display control device are provided. The method includes: selecting a plurality of backlight sources respectively arranged at different backlight regions of a display device and measuring a light diffusion data for each of the plurality of backlight sources, where the light diffusion data includes luminance values of a plurality of pixel points of a screen of the display device and a distance between a position of each pixel point and a position of a certain backlight source of the plurality of backlight sources in the case that only the certain backlight source is turned on; preprocessing the light diffusion data to determine effective pixel points of the plurality of pixel points; fitting the light diffusion data of the effective pixel points, to obtain a point spread function y=ƒ(x) indicating a relationship between y representing a diffusion luminance value and x representing a diffusion distance, where y representing a diffusion luminance value is a luminance value of each pixel point, and x representing a diffusion distance is a distance between a position of the each pixel point and a position of a certain backlight source of the plurality of backlight sources; and determining the point spread function y=ƒ(x) as the backlight diffusion transmission parameter.