Color Display System Using Multi-Spectral LED Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-quality color display systems face challenges in maintaining color homogeneity and purity, especially in multi-display applications where optical non-uniformity and color shifts between tiles significantly reduce image quality, due to the use of multiple LEDs with small spectral variations.
Innovation Solution
A color display system that combines basic colors using at least two light sources with substantially different spectral characteristics, allowing for adjustment of their luminous output proportions to achieve precise color points, which can be automated and synchronized with time-sequential modulation, enabling correction for color shifts over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple LEDs with small spectral variations are used to generate basic colours, then colour purity is improved, but colour homogeneity and uniformity across multiple displays deteriorate
Solution Approach 1:
The patent changes the spectral parameter of light sources by using LEDs with substantially different spectral characteristics (different peak wavelengths) instead of LEDs with similar spectra. This allows adjustment of the relative luminous output proportions to achieve desired colour points while maintaining colour homogeneity across multiple displays
Solution Approach 2:
The patent introduces dynamic adjustment capability through time-sequential modulation of the relative luminous output of different light sources. This allows the system to adapt and correct colour shifts over time, maintaining colour homogeneity dynamically rather than statically
2Stability of the object's composition
If multiple light sources with different spectral characteristics are combined, then colour control and homogeneity are improved, but device complexity increases
Solution Approach 1:
The patent employs time-sequential modulation where different light sources are activated in periodic sequences. This allows multiple light sources with different spectra to be combined effectively while using simple temporal control instead of complex spatial or spectral management mechanisms
Solution Approach 2:
The patent creates a universal adjustment mechanism that can handle multiple light sources with different spectral characteristics using a common control approach. The time-sequential modulation system serves multiple functions: colour mixing, colour point adjustment, and colour homogeneity maintenance across different display tiles
3Manufacturing precision
If the relative luminous output of light sources is adjusted to achieve precise colour points, then colour control is improved, but automation and time-sequential modulation complexity increase
Solution Approach 1:
The patent implements preliminary characterization of each light source's spectral and luminous properties during system setup. This preliminary data is stored and used for automated calculation of the required time-sequential modulation ratios to achieve precise colour points, eliminating the need for complex real-time adjustments
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 solution ensures improved color control and homogeneity across multiple displays, allowing for easier integration of multiple projectors and maintaining high image quality by adjusting the relative luminous output of light sources to achieve desired color points, thereby reducing optical non-uniformity and color shifts.
Implementation Method 1
at least two light sources having a substantially different spectral characteristic
Data Source
AI summary
A color display (100, 200) for displaying an image is described wherein the color display (100, 200) is adapted for displaying a number of basic color light channels (102a, 102b, 102c). The color display (100, 200) comprises a basic color combiner (112, 212) for combining the basic colors and at least one basic color light channel (102a, 102b, 102c) comprising at least two light sources (104) having different spectral characteristics. The color display (100, 200) furthermore comprises an adjuster (106, 206) for adjusting a basic color by adjusting a relative proportion of a luminous output from the at least two light sources (104) in the basic color light channel (102a, 102b, 102c). A corresponding adjuster/controller, a multi-display system and a corresponding method for setting and/or adjusting a display system also is described.