Multi-Modal Display Illumination for Eye-Safe Color Rendering
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Solution Overview
Problem
Modern LED lights and displays emit unhealthy amounts of high-energy blue light, leading to concerns about eye safety and health, including macular degeneration and sleep disruption, while traditional incandescent bulbs are inefficient and impractical for modern applications.
Innovation Solution
A multi-modal light source system that includes a cyan emitter with a center wavelength between 470-520 nm, allowing for the creation of an eye-safe color gamut without high-energy blue wavelengths, and the ability to switch to a blue emitter for wider color gamut and increased brightness, using a combination of LEDs and phosphors to achieve desired color rendering and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If modern LED lights and displays use high-energy blue light wavelengths to achieve wide color gamut and high brightness, then color rendering and luminous efficacy are improved, but eye safety and health are compromised due to excessive blue light exposure
Solution Approach 1:
The patent segments the blue light emission into two separate emitters: a cyan emitter (470-520 nm) for safe operation and a blue emitter (430-480 nm) for enhanced color gamut and brightness. This segmentation allows the system to switch between or combine emitters based on operational requirements, achieving both safety and performance goals that cannot be met by a single emitter.
2Ease of manufacture
If incandescent bulbs are used to produce broad-spectrum white light, then color rendering is natural and warm, but energy efficiency is poor with most energy wasted as heat and infrared radiation
Solution Approach 1:
The patent replaces the thermal radiation mechanism of incandescent bulbs with a solid-state LED-based optical system. Instead of heating a filament to produce broad-spectrum light (which wastes energy as heat), the system uses electroluminescence in cyan and blue LED emitters to generate light directly at specific wavelengths, achieving high energy efficiency while maintaining excellent color rendering through the combination of emitters and phosphors.
3Object-affected harmful factors
If a single cyan emitter is used to eliminate blue light hazards, then eye safety is improved, but color gamut and brightness are reduced
Solution Approach 1:
The patent implements a dynamic system where the cyan and blue emitters can be switched on or off independently based on operational requirements. The controller adjusts the operation of each emitter to balance eye safety with color gamut and brightness needs, allowing the system to adapt to different usage scenarios such as nighttime mode (cyan only) or daytime/high-performance mode (both emitters).
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
The system effectively reduces eye-hazardous blue light exposure, maintains color accuracy and brightness, and enhances power efficiency, addressing both health and efficiency concerns in LED lighting and display technology.
Implementation Method 1
a cyan LED emitter having a center wavelength between 470-520 nm
Implementation Method 2
switch to a blue emitter for wider color gamut and increased brightness
Implementation Method 3
using a combination of LEDs and phosphors to achieve desired color rendering and power efficiency
Data Source
AI summary
Presented are apparatus, systems and methods for creating tuned color emissions, from lighting and displays, that can be electronically controlled to select a desirable spectrum of wavelengths safer for human vision, for optimal color reproduction, for energy/brightness efficiency, and more. Apparatus including light emitting chips, materials, package design, electronic control devices and circuits, lights, light-fixtures, display panels, visual computing devices and systems, are disclosed. An embodiment is described which is capable of operating in modes, where eye-safe colors are rendered with minimal harmful wavelengths, as well as at least one mode of operation favoring color rendering, and brightness configurations. An embodiment is operable to deliver a paper-like black-on-white viewing experience, in both night-time and day-time operating modes, with reduced high-energy blue-wavelength light spectra. In one embodiment, the light-emitter, controller, display and system are operable to switch between these modes of operation, retaining or enhancing color-integrity, for a more seamless user experience, optimizing power efficiency and safety. Embodiments include LED-backlit LCDs, organic light emitting diodes (OLED), Micro-LED, ePaper (reflective displays), and light sources are described. Additionally, the methods of construction, materials, electrical drive, pixel color adjustment, and modes of system operation are described, such that one of ordinary skill in the art could construct an apparatus capable of operating in eye-safe, bright and colorful modes of operation, are also included.