OLED Sub-Pixel Resonant Distance Optimization
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Solution Overview
Problem
Existing display devices using organic light emitting diodes (OLEDs) face challenges in achieving improved optical characteristics, particularly in the design and fabrication of sub-pixels to enhance light emission efficiency and color accuracy.
Innovation Solution
The proposed display device incorporates a configuration with three types of sub-pixels, each featuring a reflective electrode, a planarization layer, an anode electrode, an emission structure, and a cathode electrode. The sub-pixels differ in the placement and thickness of buffer patterns and the distance between the anode and reflective electrodes, optimizing the resonant distance for efficient light amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between the anode electrode and the reflective electrode is increased, then the light emission efficiency is improved, but the device complexity increases due to the need for additional buffer patterns and planarization layers
Solution Approach 1:
The patent applies local quality by differentiating the buffer pattern configurations across first, second, and third sub-pixels. The first sub-pixel includes both first and second buffer patterns, the second sub-pixel includes only the first buffer pattern, and the third sub-pixel has no buffer patterns. This localized variation in buffer pattern placement optimizes the resonant distance for light amplification in each sub-pixel while managing overall device complexity
Solution Approach 2:
The patent implements dynamics by making the resonant distance adjustable through varying buffer pattern configurations. The distance between the anode electrode and reflective electrode is optimized for light amplification in each sub-pixel type, allowing the device to dynamically adapt optical characteristics for different wavelength ranges without requiring a completely different structural design
2Measurement precision
If buffer patterns are added to adjust resonant distance, then color accuracy is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by adjusting the thickness of the planarization layer and the presence/absence of buffer patterns to optimize the resonant distance in each sub-pixel. By varying these physical parameters across different sub-pixel types, the patent achieves improved color accuracy while relying on standard fabrication processes rather than requiring ultra-precision manufacturing
3Shape
If the planarization layer thickness is increased, then the upper surface planarity is improved, but the resonant distance for light amplification is reduced
Solution Approach 1:
The patent applies segmentation by dividing the display device into first, second, and third sub-pixels with different planarization layer thickness requirements. Each sub-pixel is optimized independently - the first sub-pixel has greater planarization layer thickness for enhanced planarity, while the second and third sub-pixels have reduced thickness to maintain optimal resonant distance for light amplification
Solution Approach 2:
The patent implements local quality by making the planarization layer thickness non-uniform across different sub-pixels. The thickness is locally optimized based on the specific functional requirements of each sub-pixel type, allowing simultaneous achievement of good surface planarity and effective light amplification in their respective locations
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 configuration enhances the light emission efficiency and color accuracy of the display device by adjusting the resonant distance for each sub-pixel, allowing for effective amplification of light in specific wavelength ranges and improved overall optical characteristics.
Implementation Method 1
Organic light emitting diodes (OLEDs) are active emission display elements that not only feature a large viewing angle and excellent contrast but also can operate at a relatively low voltage
Implementation Method 2
each of the first sub-pixel, the second sub-pixel, and the third sub-pixel may include: a reflective electrode on a base layer
Data Source
AI summary
A display device includes: a first sub-pixel, a second sub-pixel, and a third sub-pixel, wherein each of the first sub-pixel, the second sub-pixel, and the third sub-pixel includes: a reflective electrode on a base layer; a planarization layer on the reflective electrode and providing a planar upper surface; an anode electrode on the planarization layer; an emission structure on the anode electrode; and a cathode electrode on the emission structure, wherein the first sub-pixel further includes a first buffer pattern between the base layer and the reflective electrode, and wherein in the third sub-pixel, the reflective electrode is directly on the base layer.