OLED Subpixel Electrode Thickness Optimization
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Solution Overview
Problem
Conventional OLED display devices face limitations in increasing resolution due to the spacing requirements of red, green, and blue organic emission layers formed using a shadow mask, which hinders the enhancement of image display performance.
Innovation Solution
The organic light emitting display device features a substrate with red, green, and blue sub-pixel regions, each having reflective electrodes and first electrodes of different thicknesses, along with a white organic common layer and a reflective protective film, allowing for optimized luminous efficiency and reduced power consumption without the constraints of shadow mask resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If shadow mask is used to form red, green, and blue organic emission layers, then color separation is achieved, but resolution is limited due to spacing requirements
Solution Approach 1:
The patent extracts the color filtering function from the shadow mask process by using a white organic common layer combined with color filters on the opposite electrode. This eliminates the need for complex shadow mask spacing and enables higher resolution displays without the geometric constraints of conventional color separation methods
Solution Approach 2:
Instead of forming colored emission layers directly in the substrate electrode, the patent inverts the approach by using a white common layer and placing color filters on the opposite electrode. This inversion allows color separation to occur through optical filtering rather than through physical spacing constraints during deposition
2Loss of energy
If first electrodes have different thicknesses in different sub-pixel regions, then luminous efficiency is optimized through constructive interference, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by varying the thickness of the first electrode specifically in the red sub-pixel region compared to green and blue regions. This localized thickness variation creates constructive interference for red light emission, optimizing luminous efficiency for each color region with targeted structural modifications rather than uniform changes throughout the device
Solution Approach 2:
The patent changes the physical parameter of electrode thickness in specific sub-pixel regions to optimize optical interference effects. By adjusting the thickness parameter of the first electrode in red regions, the device achieves enhanced luminous efficiency through constructive interference while maintaining standard thickness in other regions
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 luminous efficiency and reduces power consumption by optimizing light emission from sub-pixels through constructive interference, enabling higher resolution without the limitations of shadow mask spacing.
Implementation Method 1
holes injected from the anode and electrons injected from the cathode are recombined in the EML, forming excitons, which are hole-electron pairs, and light is emitted when the excitons return to a ground state
Implementation Method 2
This configuration enhances luminous efficiency and reduces power consumption by optimizing light emission from sub-pixels through constructive interference
Data Source
AI summary
An organic light emitting display device and a method of manufacturing the same are provided. The organic light emitting display device includes a substrate including red, green, and blue sub-pixel regions, reflective electrodes on the substrate, a reflective protective film on the substrate and surrounding sides and front surfaces of each reflective electrode, the reflective electrodes being on the reflective protective film, first electrodes on the substrate, the reflective protective film being on the first electrodes, the first electrodes including different respective thicknesses in the respective red, green, and blue sub-pixel regions, a second electrode facing the first electrodes, and a white organic common layer between the first and second electrodes.