Phase Shifting Mirror Patterns for OLED Resonance Control
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Solution Overview
Problem
Current organic light emitting devices (OLEDs) face challenges in achieving precise control over resonance wavelengths and color purity due to limitations in the design of phase shifting mirrors, which affect the efficiency and accuracy of light emission.
Innovation Solution
The implementation of a phase shifting mirror with a periodic arrangement of patterns on the surface of the electrode, where the width and depth of the patterns are optimized to create a resonator with a specific resonance wavelength, allowing for precise control over light emission by adjusting the optical length and phase shift, thereby enhancing color purity and matching the resonance wavelength with the light emitting wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional phase shifting mirrors are used in OLEDs, then manufacturing is simpler, but resonance wavelength control precision and color purity deteriorate
Solution Approach 1:
The phase shifting mirror is segmented into multiple patterns (first, second, third patterns) with different geometric configurations. Each pattern type provides different phase shifting characteristics, allowing precise control of resonance wavelengths through the combined effect of multiple segmented elements rather than a single uniform structure.
Solution Approach 2:
Different regions of the phase shifting mirror have different local properties - the first pattern has different geometric characteristics than the second and third patterns. This local quality variation enables different phase shifting amounts in different regions, achieving precise resonance wavelength control tailored to specific color requirements.
2Manufacturing precision
If complex thickness adjustments are made to control resonance wavelengths, then wavelength precision improves, but manufacturing complexity increases
Solution Approach 1:
Instead of adjusting thickness parameters, the invention changes geometric parameters of the phase shifting mirror patterns (widths, spacing, shapes) to control resonance wavelengths. The first pattern has a first width and the second pattern has a second width, allowing wavelength control through lateral dimensions that are easier to manufacture with standard photolithography processes.
Solution Approach 2:
The invention replaces mechanical thickness adjustment with optical phase shifting achieved through pattern geometry. Instead of physically adjusting layer thicknesses to control resonance, the phase shifting mirror patterns create the necessary phase differences through their geometric configuration, simplifying the manufacturing process.
3Manufacturing precision
If phase shifting mirror patterns are optimized for specific wavelengths, then color purity improves, but device adaptability decreases
Solution Approach 1:
The phase shifting mirror structure is designed with multiple pattern types that can be configured to achieve different resonance wavelengths. By adjusting the geometric parameters (widths, spacing, shapes) of the first, second, and third patterns, the same basic structure can be tuned for different color requirements (red, green, blue pixels), providing universal applicability across different wavelength needs.
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 approach allows for improved color purity and simplified manufacturing by enabling precise adjustment of resonance wavelengths, reducing the need for complex thickness adjustments and allowing for the emission of white visible light across different pixels.
Implementation Method 1
The phase shifting mirror and the second electrode may constitute a resonator having a resonance wavelength, and the resonance wavelength of the resonator may be determined according to at least one of the first width, the second width, a depth of each of the plurality of patterns, and an arrangement period of the plurality of patterns
Implementation Method 2
a phase shifting mirror formed on a top surface of the first electrode, the phase shifting mirror comprising a plurality of patterns arranged in a periodic manner
Implementation Method 3
The first electrode may comprise a reflective metal material, and the phase shifting mirror may comprise a same reflective metal material as the first electrode
Data Source
AI summary
A light emitting device and a display apparatus including a phase shifting mirror are provided. The light emitting device includes a first electrode, a light emitting structure, a second electrode, and a phase shifting mirror. The phase shifting mirror has a number of patterns arranged in a periodic manner with an interval between adjacent patterns. Each pattern has a top surface and a side surface between the top surface of the respective pattern and the top surface of the first electrode. A first width at a bottom portion of the respective pattern directly adjacent to the top surface of the first electrode is greater than a second width of the top surface of the respective pattern, and the first width and the second width are less than a wavelength of light generated in the light emitting structure.