Polarized Light Emission Display Element With Resonant Cavity
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Solution Overview
Problem
Conventional light emission display devices output unpolarized light, which, when polarized for use with polarization-sensitive optical elements, result in reduced brightness and power efficiency due to significant light filtration.
Innovation Solution
Incorporating an electroluminescent light source and a plurality of reflective elements forming a resonant cavity for polarization, allowing for the emission of polarized light, and using meta-reflectors to enhance light emission within specific polarization and wavelength ranges, enabling polarization multiplexing and tailored angular profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light emission display devices are used with polarization-sensitive optical elements, then the system can be constructed, but brightness and power efficiency are reduced due to light filtration
Solution Approach 1:
The patent changes the polarization state parameter of the emitted light from unpolarized to polarized by incorporating reflective elements that form a resonant cavity. This allows the light to maintain its intensity while being compatible with polarization-sensitive optical elements, thereby improving brightness and power efficiency without significant light filtration
Solution Approach 2:
The patent introduces reflective elements as an intermediary component between the light emission display device and the polarization-sensitive optical elements. These reflective elements form a resonant cavity that polarizes the light, serving as a mediator that enables compatibility between the two components while minimizing light loss
2Adaptability or versatility
If a polarizer is added to conventional display devices to make light compatible with polarization-sensitive optical elements, then compatibility is achieved, but more than fifty percent of light is filtered out
Solution Approach 1:
Instead of adding a polarizer that filters unpolarized light to create polarized light (the conventional approach), the patent inverts the approach by using reflective elements to generate polarized light directly from the emission process. This inversion eliminates the need for light-filtering polarizers while achieving compatibility with polarization-sensitive optical elements
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 enables higher brightness and power efficiency when used with polarization-sensitive optical elements, while allowing for different polarization states and angular control, improving display performance.
Implementation Method 1
an electroluminescent (EL) light source
Implementation Method 2
A polarization of light is resonant within the optical cavity
Implementation Method 3
a plurality of reflective elements. The plurality of reflective elements form a resonant cavity for a polarization of light
Data Source
AI summary
Various embodiments set forth light emission display elements, and display devices that include such display elements. In some embodiments, a display element includes an electroluminescent light source and a pair of reflective elements that form a resonant cavity for a particular range of wavelengths and/or a particular polarization of light. One or both of the reflective elements can include meta-reflectors, such as anisotropic meta-reflectors or chiral meta-reflectors. An optional waveplate can be placed between the reflective elements to adjust the polarization state of light emitted by the display element.