Backlight Diffusion Modeling for Accurate Dynamic Dimming
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Solution Overview
Problem
Existing display technologies face challenges in accurately modeling backlight diffusion parameters, leading to suboptimal dynamic dimming effects due to the complex and nonlinear nature of brightness diffusion from multiple light emitting regions, which affects the final display quality.
Innovation Solution
A method is introduced to generate backlight diffusion parameters using a point spread function, involving measurement, preprocessing, and function fitting to establish a lookup table with sub-tables that represent the relationship between diffusion brightness and distance, allowing for accurate calculation of equivalent backlight brightness and compensation data for each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional backlight diffusion modeling is used, then the system is simpler to implement, but the display quality and dynamic dimming effect are suboptimal due to inaccurate brightness diffusion modeling
Solution Approach 1:
The patent performs preliminary measurement and function fitting to generate backlight diffusion parameters before actual display operation. The point spread function is pre-calculated based on the optical membrane group characteristics, and lookup tables are pre-computed for different light emitting regions. This preliminary action enables accurate real-time compensation without complex runtime calculations.
Solution Approach 2:
The patent introduces a point spread function as an intermediary mathematical model to represent the complex nonlinear brightness diffusion process. This function acts as a mediator between the physical optical system and the control algorithm, enabling accurate modeling through measurement and fitting without directly solving complex physical equations during operation.
2Use of energy by moving object
If local dynamic dimming is implemented to reduce power consumption and improve contrast ratio, then energy efficiency improves, but display quality deteriorates due to inaccurate backlight diffusion modeling
Solution Approach 1:
The patent implements a feedback mechanism where the measured point spread function from actual optical membrane group characteristics is used to continuously optimize the backlight compensation algorithm. The system measures the actual diffusion pattern, fits the point spread function, and uses this feedback to adjust the compensation parameters, ensuring accurate display quality while maintaining energy efficiency.
Solution Approach 2:
The patent dynamically adjusts backlight parameters based on the fitted point spread function. By changing the diffusion parameters according to the measured optical characteristics and different display scenarios, the system achieves both energy efficiency through local dimming and high display quality through accurate compensation. The parameters are adapted rather than fixed.
Data Source
AI summary
Disclosed is a backlight diffusion parameter generation method, including: selecting and measuring illumination diffusion data of at least one light emitting region in a plurality of light emitting regions, the illumination diffusion data includes brightness data of a plurality of pixels on a display panel and distance data between positions corresponding to the plurality of pixels and a position where an illuminated light emitting region is located when only one of the light emitting regions is illuminated; preprocessing the illumination diffusion data to obtain an effective pixel; performing function fitting according to data corresponding to a plurality of effective pixels to obtain a point spread function representing a relationship between diffusion brightness and a diffusion distance; and storing a backlight diffusion parameter lookup table, which includes a plurality of sub-tables, each sub-table corresponds to one or more light emitting regions affected when only one light emitting region is illuminated.