Micro-LED Laser Display With Light Spreaders
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Solution Overview
Problem
Existing display technologies face challenges in providing very efficient and bright displays in a flat form factor suitable for general-purpose viewing, with limitations in brightness, efficiency, and size, particularly for portable electronic devices and desktop applications.
Innovation Solution
A micro-LED laser display incorporating an array of display pixels with micro-LED lasers and light spreaders, such as diffusers or refractive lenses, to increase the viewing angle and efficiency, while maintaining a flat form factor, using micro-transfer printing and photolithography for construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If laser light sources are used to provide saturated light and wide color gamut, then color quality is improved, but device size increases making it unsuitable for flat-panel displays
Solution Approach 1:
The display is segmented into an array of micro-LED lasers, each emitting a specific color. This segmentation allows the use of multiple small laser elements rather than a single large laser system, enabling compact integration while maintaining saturated color output across the display area.
Solution Approach 2:
The patent transitions from conventional 2D flat-panel light emission to 3D micro-LED laser structures with vertical cavity configurations. This dimensional change enables highly efficient light emission in a compact volume, achieving saturated colors without increasing display footprint.
2Use of energy by moving object
If micro-LED lasers are used to provide efficient light emission, then energy efficiency is improved, but viewing angle is limited due to small angular dispersion
Solution Approach 1:
Optical elements such as microlenses or light-guiding structures are introduced as intermediaries between the micro-LED lasers and the viewer. These elements redirect and spread the laser light without significant energy loss, expanding the viewing angle while preserving the high efficiency of the original light source.
Solution Approach 2:
The optical parameters of the light emission are changed by incorporating optical elements that modify the angular distribution of light. This allows the same efficient micro-LED laser source to provide both narrow-beam high-intensity output and wide-angle viewing capability through parameter transformation.
3Illumination intensity
If conventional LED displays are used to operate at high brightness, then illumination intensity is improved, but overheating occurs reducing efficiency
Solution Approach 1:
The patent utilizes the electroluminescence phase transition in micro-LED lasers, where electrical energy is directly converted to light energy with minimal heat generation. This phase transition mechanism enables high brightness operation without the significant heat buildup that occurs in conventional LED displays, maintaining efficiency even at high illumination levels.
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 solution provides high efficiency, excellent color gamut, and controlled angle of emission, enabling excellent contrast and brightness in a compact, flexible display format, suitable for both rigid and flexible substrates.
Implementation Method 1
Each display pixel has one or more micro-LED lasers disposed on the display substrate that emit light within an emission angle to form an image pixel
Implementation Method 2
One or more light spreaders are disposed in correspondence to the micro-LED lasers to increase the emission angle of light emitted by each micro-LED laser
Implementation Method 3
light spreaders can comprise light diffusers or refractive lenses
Data Source
AI summary
A micro-LED laser display having an array of display pixels includes a display substrate for displaying an image and an array of display pixels. Each display pixel has one or more micro-LED lasers disposed on the display substrate. Each micro-LED laser emits light within an emission angle. One or more light spreaders for increasing the emission angle of light emitted by each micro-LED laser are disposed in relation to the light spreaders and a controller individually controls the micro-LED lasers.