LED Color Calibration via Digital Correction Matrices
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Solution Overview
Problem
Conventional LED calibration methods, such as binning, are costly and inefficient, leading to unacceptable color and brightness variations in LEDs, which can affect the consistency of illumination in applications requiring specific color components.
Innovation Solution
A method that analyzes individual LED variations in color and brightness, calculates correction factors, and programs LED drivers to achieve consistent color and brightness output, allowing for the use of LEDs with inherent variations without labor-intensive binning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional binning process is used to achieve uniform LED color and brightness, then manufacturing precision is improved, but device complexity and cost increase due to complex inventory management and multiple bins
Solution Approach 1:
The patent changes the control parameter from physical sorting (binning) to digital correction (gamma correction values and lookup tables). Each LED's individual characteristics are measured and stored as correction parameters, which are then applied during operation to achieve uniformity without physical separation into multiple bins.
Solution Approach 2:
The patent creates a digital copy (lookup table) of each LED's characteristics and uses this copy to determine the appropriate correction parameters. This digital representation allows the system to compensate for physical variations without needing to physically sort or separate the LEDs.
2Manufacturing precision
If binning process is used to reduce LED variations, then manufacturing precision is improved, but productivity decreases due to labor-intensive selection and sorting processes
Solution Approach 1:
The patent replaces the mechanical manual process of measuring and sorting LEDs with an automated optical measurement system and computer-controlled correction. The system automatically measures each LED's characteristics and applies digital correction, eliminating the need for manual labor in the calibration process.
Solution Approach 2:
The system enables self-calibration by automatically measuring each LED's characteristics and generating the appropriate correction parameters without human intervention. The LEDs essentially calibrate themselves through the automated measurement and correction process.
3Manufacturing precision
If multiple bins of LEDs are used to achieve color consistency, then manufacturing precision is improved, but loss of substance increases due to purchasing requirements for multiple bins
Solution Approach 1:
The patent makes a single bin of LEDs with wide variations universal by applying correction parameters that adapt each LED's output to a common standard. The same set of LEDs can serve multiple color requirements through digital correction, eliminating the need to purchase separate bins for different color specifications.
Data Source
AI summary
The various implementations described herein include methods, devices, and systems for calibrating LED(s). In one aspect, an electronic device includes: a plurality of light emitting diodes (LEDs); one or more processors; and memory storing a plurality of color correction matrices, each color correction matrix of the plurality of color correction matrices corresponding to an LED of the plurality of LEDs and generated based on a desired color value for the corresponding LED, wherein the electronic device is configured to relay status of the electronic device via the plurality of LEDs operating in conjunction with the plurality of color correction matrices.