OLED Sub-pixel Vertical Height Variation Aperture Ratio
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Solution Overview
Problem
The aperture ratio of organic light-emitting display devices is compromised due to the wide non-emission areas created by the distance between neighboring emission layers, leading to reduced luminance and lifespan.
Innovation Solution
The arrangement of sub-pixels with varying vertical distances between the substrate and organic emission layers, where the second sub-pixel has a shorter vertical distance than the first and third sub-pixels, reduces overlap and dead zones during deposition, enhancing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If neighboring emission layers are separated by a long distance to prevent color mixing during deposition, then color mixing is prevented, but the non-emission area is widened and the aperture ratio deteriorates
Solution Approach 1:
The patent introduces a vertical dimension to the emission layer arrangement by forming alternating sub-pixels at different heights above the substrate. This vertical stacking allows horizontal proximity of emission layers while maintaining color separation through vertical isolation, thereby preventing color mixing without requiring large horizontal distances that would reduce aperture ratio.
Solution Approach 2:
The patent structures emission layers from different sub-pixels in a nested vertical arrangement where first, second, and third emission layers are positioned at different heights above the substrate. This nested configuration allows multiple emission layers to occupy overlapping horizontal spaces while maintaining vertical separation, enabling high aperture ratio without color mixing.
2Reliability
If the substrate and organic emission layer are separated by a larger vertical distance, then color mixing is prevented, but the aperture ratio decreases due to reduced emission area
Solution Approach 1:
The patent utilizes the vertical dimension to separate emission layers that are positioned close together horizontally. By alternating sub-pixels at different vertical distances from the substrate, the invention achieves color mixing prevention through vertical stratification rather than horizontal separation, thereby maximizing the aperture ratio.
Solution Approach 2:
The patent creates an asymmetric vertical structure where alternating sub-pixels are positioned at different heights above the substrate. This asymmetric arrangement allows emission layers to be closely spaced horizontally while maintaining vertical separation, optimizing both color mixing prevention and aperture ratio.
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 increases the aperture ratio, improving the lifespan and luminance of the organic light-emitting display device by minimizing non-emission areas and preventing color mixing during the deposition process.
Implementation Method 1
An organic light-emitting diode (OLED) display which displays an image by controlling the quantity of light emitted from an emission layer
Implementation Method 2
An emission layer included in the light-emitting element is formed through a deposition process using a metal mask
Data Source
AI summary
The present disclosure relates to an organic light-emitting display device capable of improving the aperture ratio thereof, and the organic light-emitting display device according to the present disclosure includes a plurality of sub-pixels respectively including organic emission layers arranged on a substrate, wherein a sub-pixel in which the organic emission layer is spaced a first vertical distance from the substrate and a sub-pixel in which the organic emission layer is spaced a second vertical distance from the substrate are alternatively arranged, thereby improving the aperture ratio.