OLED Pixel Subpixel Arrangement for Luminance
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Solution Overview
Problem
Existing organic light emitting display (OLED) devices face challenges in maximizing luminance, particularly due to the arrangement and efficiency of white subpixels in pixel configurations, which affect the overall brightness and color accuracy of the display.
Innovation Solution
The OLED device incorporates a specific arrangement where a white subpixel is positioned between pairs of adjacent color subpixels, ensuring that none of the color subpixels are immediately adjacent to each other, with the white subpixel interposed between them, optimizing the area and placement to enhance luminance improvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white subpixels are arranged in conventional configurations, then device complexity is reduced, but luminance is not maximized due to color mixing and light loss
Solution Approach 1:
The pixel is segmented into distinct subpixel regions (first subpixel, second subpixel, third subpixel, and fourth subpixel) with the fourth subpixel positioned between the other three. This segmentation allows independent optimization of each subpixel's function and arrangement, enabling the fourth subpixel to specifically address luminance enhancement without affecting the overall device complexity significantly.
Solution Approach 2:
The fourth subpixel acts as an intermediary element positioned between the first, second, and third subpixels. This intermediary arrangement prevents direct adjacency between certain color subpixels, reducing color mixing and light loss while maintaining a relatively simple overall pixel structure that does not drastically increase device complexity.
2Area of stationary object
If color subpixels are placed adjacent to each other, then area utilization is improved, but color mixing occurs reducing color accuracy
Solution Approach 1:
The pixel is divided into four distinct subpixels with the fourth subpixel positioned between the first, second, and third subpixels. This segmentation creates controlled spacing that prevents direct adjacency between certain color subpixels, thereby reducing color mixing while maintaining efficient area utilization through the compact arrangement.
Solution Approach 2:
The fourth subpixel serves as an intermediary barrier between the first, second, and third subpixels. This intermediary positioning prevents direct contact between color-emitting subpixels, reducing color mixing and improving color accuracy while still achieving high area utilization through the efficient four-subpixel configuration.
3Illumination intensity
If white subpixel area is increased to improve luminance, then brightness increases, but adjacent color subpixels may mix reducing display quality
Solution Approach 1:
The pixel is segmented into four subpixels with the fourth subpixel (which can be the white subpixel) positioned between the other three color subpixels. This segmentation allows the fourth subpixel to occupy sufficient area for high brightness output while the positioning strategy prevents direct adjacency with color subpixels, avoiding color mixing and maintaining display quality.
Solution Approach 2:
The fourth subpixel acts as an intermediary element that can be optimized for high luminance output. By positioning it between the first, second, and third subpixels, it achieves large area utilization for brightness enhancement while the intermediary positioning prevents color mixing with adjacent subpixels, thereby maintaining high display quality.
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 arrangement maximizes luminance by effectively utilizing the white subpixel between color subpixels, preventing light loss and color mixing, thereby improving the overall brightness and color accuracy of the display.
Implementation Method 1
holes and electrons are respectively moved to the organic light emitting layer via the hole transporting layer and the electron transporting layer, and are then combined to one another in the organic light emitting layer, thereby emitting light
Data Source
Figure 1~2
Figure 3
Figure 4A
AI summary
Disclosed is an organic light emitting display device which is capable of maximizing a luminance improvement by an appropriate arrangement of a white pixel in a pixel, wherein the organic light emitting display device comprises a plurality of pixels, wherein each pixel includes a first subpixel for emitting first-color light, a second subpixel for emitting second-color light, a third subpixel for emitting third-color light, and a fourth subpixel for emitting fourth-color light, wherein the fourth subpixel for each pixel is disposed between the first and second subpixels, and between the first and third subpixels.