Display System Dynamic Chromaticity Calibration for Color Consistency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional local dimming algorithms in display technology suffer from color differences in flat panel and projection displays due to factory differences and aging inconsistencies of light source units, leading to noticeable color deviations in the final displayed image.
Innovation Solution
A display system comprising a light source system, a display unit, and a dynamic control module that calibrates each light source unit to obtain chromaticity and brightness information, generating modulation signals to adjust the light source system and display unit, ensuring consistent color across different primary color coordinates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional local dimming algorithms are used, then high dynamic range display is achieved, but color differences occur due to factory differences and aging inconsistencies of light source units
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the modulation current for each light source unit based on its individual characteristics (chromaticity coordinates, maximum brightness, correlation curves). This allows the system to compensate for factory differences and aging inconsistencies, maintaining color consistency while achieving high dynamic range display through local dimming.
Solution Approach 2:
The patent implements local quality by treating each light source unit individually with unique calibration parameters rather than applying uniform control. Each unit's chromaticity information, maximum brightness, and current-brightness correlation curves are stored and used to generate specific modulation signals, ensuring that each region maintains accurate color reproduction despite variations in light source characteristics.
2Manufacturing precision
If each light source unit is calibrated individually, then color consistency is improved, but system complexity increases due to storing and processing multiple parameters
Solution Approach 1:
The patent applies segmentation by dividing the light source array into individually addressable light source units, each with its own calibration data stored in memory. This allows the system to manage complexity through modular organization, where each unit's parameters are independently stored and processed, enabling precise color control without requiring complex inter-unit interactions.
Solution Approach 2:
The system implements self-service by automatically retrieving and applying the correct modulation current parameters for each light source unit based on its stored calibration data. The control system autonomously compensates for individual unit variations without requiring manual adjustment, maintaining color consistency through automated parameter application.
3Adaptability or versatility
If light source units with different primary color chromaticity coordinates are used, then adaptability is improved, but color difference in displayed image worsens
Solution Approach 1:
The patent uses parameter changes to adapt to different light source units by storing their specific chromaticity coordinates and using this information to calculate appropriate modulation currents. The system dynamically adjusts parameters based on each unit's characteristics, enabling high adaptability while maintaining color accuracy through compensatory parameter modification.
Solution Approach 2:
The system implements feedback by using the stored chromaticity information and maximum brightness data of each light source unit to continuously optimize the modulation current. This closed-loop approach ensures that variations in light source characteristics are compensated for, maintaining color accuracy across different units with varying primary color chromaticity coordinates.
Data Source
AI summary
A display system includes a light source system including a light source array formed from multiple light source units, and used to emit a light beam, wherein the light source array can be divided into I×J sub-regions; a display unit disposed on an emergent light path of the light source system, and used to modulate a light spot on a surface thereof according to a light spot modulation signal, so as to generate image light; and a dynamic control module for obtaining the light spot modulation signal and a current modulation signal according to an image signal, dynamically updated chromaticity information and maximum brightness information of the light source units, and a correlation curve between a modulation current and brightness, wherein the current modulation signal is used to adjust the light source system.