Geometric Phase Lens for OLED Color Purity
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Solution Overview
Problem
Current OLED display apparatuses face challenges in achieving high color purity due to secondary and third resonances of blue and ultraviolet wavelengths, which degrade display performance and limit the use in augmented and virtual reality applications.
Innovation Solution
A light emitting device and display apparatus featuring a metal reflective layer with a phase modulation surface containing oblong phase modulation elements that form a geometric phase lens, where protrusions resonate desired wavelengths and recesses absorb undesired wavelengths, enhancing polarization and focusing of light, and improving color purity by selectively resonating and emitting specific colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional OLED structure is used, then the device can be manufactured with standard processes, but secondary and third resonances of blue and ultraviolet wavelengths occur which degrade color purity
Solution Approach 1:
The patent changes the physical parameters of the reflective layer by introducing a phase modulation surface with specific geometric features (protrusions and recesses) that have different dimensions and shapes. These geometric parameters are optimized to resonate at specific wavelengths (blue and ultraviolet) while suppressing resonances at other wavelengths, thereby improving color purity by eliminating harmful secondary and third resonances.
Solution Approach 2:
The reflective layer is designed with non-uniform local structures - specifically, protrusions and recesses with different geometries distributed across the surface. Each local structure is tailored to interact with specific wavelengths of light, creating wavelength-selective resonance characteristics that improve overall color purity by suppressing unwanted spectral components.
2Manufacturing precision
If the phase modulation surface with protrusions and recesses is added, then color purity is improved by selective resonance, but the device structure becomes more complex
Solution Approach 1:
The patent combines multiple functions into a single reflective layer structure. The phase modulation surface with its protrusions and recesses simultaneously serves as both the reflective surface and the wavelength-selective resonance control mechanism. This integration eliminates the need for separate filtering layers or additional optical components, thereby improving color purity without proportionally increasing device complexity.
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 effectively enhances color purity by selectively resonating and emitting desired wavelengths, such as red and green light, while absorbing blue light, thereby improving the display performance and efficiency in augmented and virtual reality applications.
Implementation Method 1
Each of the plurality of protrusions may resonate light of a first wavelength
Implementation Method 2
the plurality of recesses may absorb light of a second wavelength different from the first wavelength
Implementation Method 3
Light having a predetermined polarization may be reflected, focused, and output by the arrangement of the oblong phase modulation elements
Data Source
AI summary
A light emitting device includes a metal reflective layer including a phase modulation surface on which oblong phase modulation elements are formed; a first electrode provided on the metal reflective layer; an organic emission layer that is provided on the first electrode and that emits light; and a second electrode provided on the organic emission layer, wherein the oblong phase modulation elements are arranged to form a geometric phase lens.