OLED Micro-Cavity Optical Path Length Uniformity
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Solution Overview
Problem
OLED displays face challenges in achieving uniform light emitting efficiency across red, green, and blue pixels, leading to difficulties in representing desired color coordinates and white color display due to the need for different optical path lengths for each pixel, which increases manufacturing complexity.
Innovation Solution
The OLED display employs a micro-cavity structure with shared optical path lengths for at least two pixels, using a translucent member and a transparent member to enhance light interference, and includes a white pixel without a micro-cavity to simplify the manufacturing process and improve luminance and color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If different optical path lengths are formed for each pixel (red, green, blue) to improve color representation, then color accuracy is improved, but manufacturing complexity increases due to additional processing steps
Solution Approach 1:
The patent merges the micro-cavity structure formation process across multiple pixels by using a single translucent layer that serves as a shared optical path length for red, green, and blue pixels. This eliminates the need for separate processing steps for each pixel, thereby reducing manufacturing complexity while maintaining color accuracy through the unified optical path length design.
Solution Approach 2:
The translucent layer is designed to serve multiple functions simultaneously: it acts as the optical path length for red pixels, provides the optical path length for green pixels, and serves as the optical path length for blue pixels. This multi-functional design allows a single structure to replace multiple separate structures, simplifying the manufacturing process while maintaining color representation accuracy.
2Manufacturing precision
If a micro-cavity structure is implemented to improve luminance and color reproducibility, then display quality is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines the micro-cavity formation into a single unified structure using one translucent layer that provides the optical path length for all color pixels simultaneously. This merging approach maintains the luminance and color reproducibility benefits of micro-cavities while eliminating the need for multiple separate processing steps that would otherwise be required for each pixel type.
Solution Approach 2:
The patent segments the optical path length function by assigning different thicknesses of the same translucent layer to different pixel regions. The translucent layer has a first thickness for red pixels, a second thickness for green pixels, and a third thickness for blue pixels, allowing each pixel type to receive its optimized optical path length through a single continuous layer rather than multiple separate structures.
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 simplifies the manufacturing process by reducing the number of required steps for forming different optical path lengths and enhances luminance and color reproducibility, allowing for effective display of full colors with improved light emitting efficiency.
Implementation Method 1
light is repeatedly reflected between a reflection layer and a translucent layer in which both layers are separated by a predetermined distance (e.g., an optical path length) such that a strong interference effect is generated in the light. Accordingly, light of a specific wavelength is constructive, and light of remaining wavelengths is destructive.
Implementation Method 2
One of the two electrodes injects holes and the other electrode injects electrons into the organic light emitting layer. The injected electrons and holes are recombined to form excitons, which emit light as release energy.
Data Source
AI summary
An organic light emitting device including a first pixel, a second pixel and a third pixel displaying different colors from each other according to the present invention, the organic light emitting device includes a reflecting electrode and a translucent member forming a micro-cavity along with the reflecting electrode, wherein a optical path length is an interval between the reflecting electrode and the translucent member, and wherein the light path lengths of at least two pixels among the first pixel, the second pixel and the third pixel are the same.