OLED Quad Sub-pixel Structure for Aperture Ratio and Visibility
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Solution Overview
Problem
OLED devices face challenges in achieving a high aperture ratio while maintaining visibility, as existing arrangements such as the stripe format compromise visibility when attempting to secure the desired aperture ratio.
Innovation Solution
The OLED device employs a quad-type sub-pixel arrangement with a first functional layer covering all sub-pixels and second and third functional layers in stripe shapes along specific sub-pixels, allowing for enhanced aperture ratio and visibility by optimizing the arrangement and structure of sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sub-pixels are arranged in a stripe format to improve visibility, then visual recognizability is enhanced, but aperture ratio cannot reach at least 30%
Solution Approach 1:
The pixel is divided into four sub-pixels (first, second, third, and fourth sub-pixels) arranged in a specific pattern. This segmentation allows for optimized light emission areas while maintaining visibility, enabling the aperture ratio to reach at least 30% without compromising visual recognizability.
Solution Approach 2:
The patent employs an asymmetric arrangement where the first and second sub-pixels emit first color light, the third sub-pixel emits second color light, and the fourth sub-pixel emits third color light. This asymmetric configuration optimizes the aperture ratio while preserving visibility, departing from traditional symmetric stripe formats.
2Area of stationary object
If delta format or modified circuit configuration is used to secure aperture ratio, then aperture ratio may be improved, but visibility deteriorates even below stripe format
Solution Approach 1:
Different regions of the pixel are assigned different functional qualities: the first and second sub-pixels are configured to emit first color light, the third sub-pixel emits second color light, and the fourth sub-pixel emits third color light. This local differentiation optimizes both aperture ratio and visibility by assigning specific emission characteristics to specific regions.
Solution Approach 2:
The patent transitions from traditional two-dimensional stripe or delta arrangements to a four-sub-pixel configuration with specific color emission assignments. This dimensional reorganization allows simultaneous optimization of aperture ratio and visibility by utilizing spatial arrangement more effectively.
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 simultaneously enhances the aperture ratio and visibility, achieving better process productivity and maintaining the same visual recognizability as the stripe format, while reducing the process margin and power consumption.
Implementation Method 1
The OLED device displays an image using a principle of emitting light through the recombination of electron and electric hole, which are applied from the electrodes, in the functional layer.
Data Source
AI summary
An OLED device includes a substrate including first through fourth sub-pixel regions arranged in a quad type, a first electrode disposed on each of the first through fourth sub-pixel regions, a first functional layer disposed on all the first through fourth sub-pixel regions and configured to emit first color light, a second functional layer formed in a stripe shape, which progresses along the second and fourth sub-pixel regions arranged in a row direction, and configured to emit second color light, a third functional layer formed in another stripe shape, which progresses along the third and fourth sub-pixel regions arranged in a column direction, and configured to emit third color light, and a second electrode disposed on the entire surface of the substrate including the first through third functional layers.