Dual-Wavelength Blue LED Pixels for Low-Blue Emissive Displays
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Solution Overview
Problem
Current emissive displays, particularly mini- and micro-LEDs, face challenges in reducing melatonin suppression and circadian disruption due to the high blue wavelength used, which increases manufacturing costs when attempting to implement high and low blue light operational modes, as adding a fourth LED chip for a lower blue wavelength channel complicates system design and increases costs.
Innovation Solution
Incorporating a dual wavelength blue LED chip into the display, which can operate within the conventional RGB architecture, allowing for high and low blue light modes without the need for a fourth subpixel, by using a dual wavelength LED in each pixel with a three-contact driver to independently control the LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fourth LED chip is added to create a lower blue wavelength channel, then melatonin suppression is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling the existing blue LED to operate in two different wavelength modes (high blue and low blue) through temperature control, replacing the need for a dedicated fourth LED chip. This allows the same physical component to serve multiple spectral functions, reducing device complexity while maintaining the ability to reduce melatonin suppression.
Solution Approach 2:
The patent changes the operational parameters of the blue LED by controlling its temperature to shift between high blue wavelength mode and low blue wavelength mode. By adjusting the temperature parameter, the LED emits different wavelengths, enabling melatonin suppression reduction without adding hardware complexity.
2Object-affected harmful factors
If a fourth LED chip is added to create a lower blue wavelength channel, then melatonin suppression is reduced, but manufacturing cost increases
Solution Approach 1:
The patent makes the existing blue LED multi-functional by enabling it to operate in both high blue and low blue modes through temperature control, eliminating the need to manufacture and assemble a fourth LED chip. This reduces manufacturing costs associated with chip supply, transfer, and integration while maintaining the capability to reduce melatonin suppression.
Solution Approach 2:
The patent creates a functional copy of the low blue wavelength emission capability through temperature-controlled operation of the existing blue LED, rather than physically copying it with a separate LED chip. This virtual copy approach reduces manufacturing complexity and cost.
3Ease of manufacture
If conventional RGB architecture is used, then manufacturing cost is reduced, but the ability to provide low blue light mode is lost
Solution Approach 1:
The patent introduces dynamics to the conventional RGB architecture by making the blue LED's wavelength emission可调 (adjustable) through temperature control. The blue LED dynamically shifts between high blue and low blue modes based on operational requirements, providing mode flexibility within the standard three-subpixel architecture without increasing manufacturing cost.
Solution Approach 2:
The patent changes the operational parameters of the blue LED through temperature control, enabling it to emit different wavelengths (high blue or low blue) as needed. This parameter adjustment provides adaptability and versatility in blue light mode selection while maintaining the cost-effective conventional RGB architecture.
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 enables the display to switch between high and low blue light modes efficiently, reducing melatonin suppression while maintaining cost-effectiveness by integrating a dual wavelength LED into the existing RGB architecture, thus simplifying system design and reducing manufacturing costs.
Implementation Method 1
at least one LED of the three subpixels of each pixel comprises a dual wavelength LED
Implementation Method 2
Each technology has R&D challenges to improve performances and implement in mass production, but also provides pathways to significantly decrease display power consumption
Data Source
AI summary
A display comprising: (a) a plurality of pixels, each of said plurality of pixels comprising three sub pixels with each subpixel comprising an LED, wherein at least one LED of said three subpixels of each pixel comprises a dual wavelength LED; and (b) at least one driver for driving LEDs of said three subpixels, said at least one driver having three contacts for said at least one LED of each pixel.