OLED Substrate Variable Microcavity Anode Height
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Solution Overview
Problem
OLED display devices have limited display performance due to a fixed microcavity structure that can only enhance light extraction efficiency at a specific wavelength, resulting in poor emission of multiple wavelengths.
Innovation Solution
The OLED display substrate features sub-pixels with an anode structure including a light-reflective layer and a first transparent conductive layer between the light-reflective layer and the light-emitting layer, with varying vertical distances to create microcavities of different lengths for each color, allowing for resonance wavelengths corresponding to desired peak wavelengths, thereby improving luminous efficiency and color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fixed microcavity structure is used in OLED display devices, then light extraction efficiency at a specific wavelength is enhanced, but emission performance at multiple wavelengths deteriorates
Solution Approach 1:
The patent applies local quality by making the microcavity length variable across different sub-pixels rather than uniform throughout the display. Each sub-pixel's anode is positioned at a specific height to create a microcavity length optimized for its emission wavelength, allowing different regions to have tailored optical properties for red, green, and blue sub-pixels respectively
Solution Approach 2:
The patent changes the microcavity length parameter across different sub-pixels to optimize performance at multiple wavelengths. By varying the anode height position, the microcavity length is adjusted to create resonance conditions specific to each color's emission wavelength, transforming a fixed-parameter system into a variable-parameter system that adapts to different optical requirements
2Productivity
If the anode is positioned closer to the light-emitting layer, then hole injection efficiency is improved, but microcavity length control for wavelength optimization deteriorates
Solution Approach 1:
The patent introduces dynamics by making the anode position variable rather than fixed. The anode is positioned at different heights for different sub-pixels, creating a dynamic structure where the microcavity length can be optimized for each color. This dynamic positioning allows simultaneous optimization of hole injection (by maintaining adequate proximity to the light-emitting layer) and wavelength-specific resonance (by adjusting microcavity length)
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 design enhances luminous efficiency and narrows the luminescent peak for each color, widening the color gamut and allowing for flexible display demands by optimizing microcavity lengths for different sub-pixels.
Implementation Method 1
a microcavity is formed between the anode and the cathode, the microcavity is configured to select light of a target wavelength from light emitted by the light-emitting layer
Implementation Method 2
when a current passes, holes generated by an anode and electrons generated by the cathode recombine in a light-emitting layer to emit light
Implementation Method 3
The anode includes: a light-reflective layer, and a first transparent conductive layer covering the light-reflective layer
Data Source
AI summary
An OLED display substrate, a method for manufacturing the same, and a display device are provided. The OLED display substrate includes multiple sub-pixels, and at least one sub-pixel includes: an anode, a cathode, and a light-emitting layer between the anode and the cathode. The anode includes: a light-reflective layer and a first transparent conductive layer covering the light-reflective layer, and the first transparent conductive layer is located between the light-reflective layer and the light-emitting layer. First vertical distances between first surfaces of the first transparent conductive layers of the subpixels of different colors facing the respective cathodes and the respective cathodes are the same, and second vertical distances between the first surfaces of the first transparent conductive layers of the subpixels of different colors and second surfaces of the respective light-reflective layers facing the respective cathodes are different.