Light Emitter Selection Using Multi-Axis Color Space
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Solution Overview
Problem
Current methods for grouping light emitters in backlighting units, such as LCD displays, face challenges in achieving uniformity due to differences in spectral power distributions among emitters with similar chromaticity coordinates, leading to non-uniformity in display output.
Innovation Solution
The method involves selecting light emitters using a multiple axis color space with specific geometries and orientations, such as elliptical or hexagonal regions, and applying an application-specific transmission characteristic to group them based on their spectral power distribution data, ensuring uniformity by accounting for the filtering effects of transmissive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light emitters are grouped based on chromaticity coordinates (x,y values), then the grouping process is simple and efficient, but emitters with similar chromaticity values but different spectral power distributions are grouped together, adversely impacting uniformity in display output
Solution Approach 1:
The patent transitions from two-dimensional chromaticity coordinates (x,y) to a three-dimensional color space incorporating luminance (Y), creating a more comprehensive classification framework. This dimensional expansion allows differentiation of emitters with identical chromaticity but different luminance or spectral characteristics, thereby improving grouping precision without sacrificing efficiency
Solution Approach 2:
The invention changes the classification parameters from simple chromaticity coordinates to a combination of chromaticity values and spectral power distribution characteristics. By incorporating additional parameters (spectral shape, luminance), the system achieves more precise emitter selection that ensures display uniformity while maintaining practical grouping efficiency
2Manufacturing precision
If a strict spectral power distribution matching criterion is applied to group light emitters, then display uniformity is improved, but the selection process becomes more complex and time-consuming
Solution Approach 1:
The patent segments the spectral power distribution analysis into discrete wavelength bands, evaluating emitters in specific spectral regions rather than requiring complete spectral matching. This segmentation approach maintains uniformity requirements while reducing the complexity of the selection process by focusing on critical spectral regions
Solution Approach 2:
The invention applies different weighting or evaluation criteria to different spectral regions based on their importance to display performance. By focusing strict matching criteria on critical wavelength regions while allowing more flexibility in less critical regions, the system achieves uniformity without excessive complexity
Data Source
AI summary
Provided are devices and methods for grouping light emitters and devices including the same. Embodiments of such methods may include selecting a portion of the light emitters using a region of a multiple axis color space that is configured to represent each of a plurality of colors as at least two chromaticity coordinates. The region may be proximate a predefined point on the multiple axis color space and includes a major axis having a first length and a minor axis having a second length that is less than the first length.