OLED Micro-Resonant Chamber Design for Light Saturation
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Solution Overview
Problem
Current OLED display panels face challenges in enhancing the opening ratio and light-emission efficiency of top-emitting OLED elements, particularly in achieving high-definition and all-color displays with improved light saturation and assembly efficiency.
Innovation Solution
The implementation of a micro-resonant chamber effect in OLED display panels, achieved by varying the thickness of anode layers in sub-pixel areas and using an inorganic protruding layer to define pixel areas, along with a pixel definition layer to isolate the organic functional layers, enhances light emission characteristics and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the opening ratio of top-emitting OLED elements is increased to improve light emission, then light-emission efficiency is improved, but light saturation and color purity deteriorate
Solution Approach 1:
The patent applies local quality by creating micro-resonant chambers with different cavity lengths for different color sub-pixels (red, green, blue). Each sub-pixel area has a specifically designed cavity length that matches the wavelength of its emitted light, optimizing light saturation locally for each color while maintaining high opening ratios across the entire display.
Solution Approach 2:
The patent changes the physical parameter of cavity length in the micro-resonant chambers to match different wavelengths of emitted light. By adjusting the cavity length parameter for each color sub-pixel, the system achieves optimal light saturation and color purity while maintaining high opening ratios, thus resolving the contradiction between light-emission efficiency and light saturation.
2Ease of manufacture
If conventional OLED structures are used with standard anode thickness, then manufacturing is simplified, but light saturation and color purity are insufficient
Solution Approach 1:
The patent implements local quality by varying the anode layer thickness in different sub-pixel areas corresponding to different colors. Each color sub-pixel has a specifically optimized anode thickness that works in conjunction with its micro-resonant chamber to achieve optimal light saturation and color purity, while the overall manufacturing process remains relatively simple.
3Device complexity
If OLED elements are exposed to environmental factors, then device structure is simplified, but lifespan and reliability deteriorate
Solution Approach 1:
The patent applies the nested doll principle by placing the organic light-emitting elements inside the inorganic protruding layer structure. The inorganic protruding layer acts as a protective outer shell that encapsulates the sensitive organic materials, protecting them from environmental factors such as moisture and oxygen while maintaining a relatively compact and simple overall device structure.
4Manufacturing precision
If high-definition and all-color display is achieved, then image quality is improved, but assembly efficiency and manufacturing complexity worsen
Solution Approach 1:
The patent merges multiple functions into the inorganic protruding layer structure. This single structure simultaneously serves as: (1) a pixel definition layer that isolates different color sub-pixels, (2) a protective barrier against environmental factors, and (3) a structural element that defines the micro-resonant chamber cavities. By combining these functions, the patent achieves high-definition all-color display while maintaining reasonable assembly efficiency and reducing manufacturing 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
This approach improves light saturation and assembly efficiency by adjusting the micro-resonant chamber lengths to match the wavelengths of emitted light, while the inorganic protruding layer protects OLED elements from environmental factors, thereby extending their lifespan.
Implementation Method 1
a structure with a micro-resonant chamber effect is formed between a upper surface of the reflecting metal layer and a lower surfaces of the cathode layer in each of the sub-pixel areas
Implementation Method 2
positive charges (holes) and negative charges (electrons) are injected respectively from the anode and the cathode into the light-emitting material layer, and recombined in the light-emitting material layer, thus resulting in an excited state in which light can be emitted
Implementation Method 3
a upper surface of the pixel definition layer is lyophobic
Data Source
AI summary
Disclosed are an organic light-emitting diode display panel, a method for fabricating the same, and a display device. The panel includes: a base substrate, a reflecting metal layer located on the base substrate, and a protruding layer located on the reflecting metal layer; a material of the protruding layer is an inorganic material, the protruding layer comprises a plurality of pixel openings distributed in an array, and the plurality of pixel openings constitute a plurality of sub-pixel areas in different colors, the display panel further comprising an anode layer, an organic functional layer, and a cathode layer stacked in each of the sub-pixel areas sequentially; a structure with a micro-resonant chamber effect is formed between a upper surface of the reflecting metal layer and a lower surfaces of the cathode layer in each of the sub-pixel areas; anode layers in the sub-pixel areas in the different colors have different thicknesses.