OLED Display Dual Blue Wavelength Segmentation
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Solution Overview
Problem
Organic light emitting diode (OLED) displays emit blue visible rays that can cause vision deterioration due to their high energy, necessitating a solution for reducing exposure while maintaining high resolution and color reproducibility.
Innovation Solution
The OLED display incorporates two blue light-emitting elements with different wavelengths, along with green and red elements, and utilizes assistance layers and hole injection layers to control light emission, allowing for high color gamut and vision protection without increasing the number of masks for organic layer deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If blue visible rays are used for OLED display, then high luminance and short wavelength are achieved, but vision deterioration occurs due to high energy exposure
Solution Approach 1:
The blue light emission is segmented into two distinct wavelength regions: first blue visible rays (459-490 nm) and second blue visible rays (440-458 nm). This segmentation allows the display to utilize the benefits of short wavelength blue light while distributing the harmful exposure across different wavelength bands, thereby reducing overall vision deterioration risk while maintaining high luminance output.
2Manufacturing precision
If multiple organic light emitting elements are added to achieve high color gamut, then color reproducibility is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple organic light emitting elements (first blue, second blue, green, and red elements) into a single integrated OLED display structure. These elements share common structural components including the substrate, pixel circuit, electrode, hole injection layer, and electron injection layer. This merging approach achieves high color gamut and excellent color reproducibility while avoiding the complexity of separate display devices, as the multiple elements are fabricated simultaneously in one manufacturing process.
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 enhances the OLED display's resolution, color reproducibility, and user vision protection by controlling blue light exposure, while reducing manufacturing complexity and cost through simultaneous mask processing.
Implementation Method 1
an organic light emitting element configured to emit light having different wavelengths for every pixel
Implementation Method 2
a hole injection layer disposed under the first organic light emitting element, the second organic light emitting element, the third organic light emitting element, and the fourth organic light emitting element
Data Source
AI summary
A method for manufacturing an organic light emitting diode display includes: forming a hole injection layer on a substrate formed with a pixel circuit; forming a first assistance layer and a second assistance layer on the hole injection layer, the first assistance layer and the second assistance layer being disposed on different positions of the hole injection layer; forming a first organic emission layer on the first assistance layer; and forming a first hole transporting layer on the second assistance layer.