Organic Light Emitting Display Sub-Pixel Sizing for Luminance and Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices face a trade-off between peak luminance and color-coordinate life, as enlarging the blue sub-pixel to equalize service lives with other sub-pixels compromises peak luminance of pure colors.
Innovation Solution
Calculating and optimizing the size of each sub-pixel (red, blue, green, and white) based on peak-luminance and average use current densities to achieve balanced performance in both peak luminance and color-coordinate life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the size of the blue sub-pixel is enlarged to equalize service lives with other sub-pixels, then the color-coordinate life is extended, but the peak luminance of pure colors cannot be realized
Solution Approach 1:
The patent applies local quality by assigning different area sizes to different sub-pixels based on their specific usage characteristics. The blue sub-pixel is enlarged to compensate for its higher deterioration rate, while other sub-pixels maintain their original sizes. This localized adjustment optimizes the overall display device longevity without compromising the peak luminance of any individual sub-pixel.
2Reliability
If the size of the blue sub-pixel is enlarged, then the current density of the blue sub-pixel is lowered, but the peak luminance of pure colors of other sub-pixels cannot be realized
Solution Approach 1:
The patent changes the physical parameter of sub-pixel area to optimize system performance. By increasing the blue sub-pixel area, the current density is reduced, extending service life. This parameter change is applied selectively to specific sub-pixels based on their deterioration characteristics, allowing each sub-pixel to operate within optimal parameters.
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
The solution allows for enhanced peak luminance achievement and extended color-coordinate life by optimizing sub-pixel sizes, minimizing deterioration speed differences and improving image-sticking life.
Implementation Method 1
an organic light emitting layer emitting light, wherein the organic light emitting layer includes a first stack including a first electron transporting layer, a first emission layer, and a second electron transporting layer stacked in this order on the anode electrode, and a second stack including a third electron transporting layer, a second emission layer, and a fourth electron transporting layer stacked in this order on the anode electrode
Data Source
AI summary
Provided are a method of manufacturing an organic light emitting display device and an organic light emitting display device manufactured by the method. The method includes calculating a peak-luminance current density for each of a red sub-pixel, a blue sub-pixel, a green sub-pixel, and a white sub-pixel, calculating an average use current density for each of the red sub-pixel, blue sub-pixel, green sub-pixel, and white sub-pixel; determining a size of each sub-pixel with the peak-luminance current density and the average use current density, and forming the sub-pixels with the determined sizes of the respective sub-pixels. The present invention sets the size of each sub-pixel in consideration of a peak-luminance current density and an average use current density, thus easily achieving the peak luminance and enhancing the color-coordinate life.