Organic EL Display Light-Adjusting Layers for Chromatic Purity
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Solution Overview
Problem
Conventional organic electroluminescent display devices face challenges in achieving high chromatic purity, low reflectance, and cost-effectiveness due to the need for multiple materials and layers, which can reduce light-emitting efficiency and increase production costs.
Innovation Solution
An organic electroluminescent display device with a configuration that includes a first light-adjusting layer selectively transmitting blue light and absorbing green and red light, and a second light-adjusting layer selectively absorbing blue light and transmitting green and red light, along with a third light-adjusting layer for additional absorption, to balance chromatic purity, transmission, and reflection reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple color filters and black matrix materials are used to achieve high chromatic purity and contrast, then display quality improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines multiple color filter functions (red, green, blue) and black matrix function into a single integrated color filter layer. This layer simultaneously performs wavelength selection for all three colors and provides light absorption in non-light-emitting regions, eliminating the need for separate black matrix layer and reducing manufacturing complexity while maintaining high chromatic purity
Solution Approach 2:
The color filter layer is designed to perform multiple functions: it acts as a wavelength-selective filter for red, green, and blue light emission, and simultaneously serves as a black matrix for light absorption in non-emitting regions. This multi-functional design reduces the number of separate components and materials needed
2Manufacturing precision
If multiple separate layers (color filters and black matrix) are used, then chromatic purity and contrast improve, but light-emitting efficiency decreases due to additional interfaces and absorption
Solution Approach 1:
By merging the color filter and black matrix into a single integrated layer, the patent eliminates additional interfaces between separate layers that would cause light scattering and absorption losses. The integrated design maintains high chromatic purity while improving light-emitting efficiency by reducing the number of optical interfaces
Solution Approach 2:
The patent extracts the black matrix function from a separate layer and integrates it into the color filter layer itself. This eliminates the need for light to pass through multiple separate layers, reducing cumulative absorption losses while maintaining the light-absorbing function in non-emitting regions
3Ease of manufacture
If conventional color filters with broad absorption bands are used, then manufacturing is simpler, but chromatic purity decreases due to absorption of useful wavelengths
Solution Approach 1:
The patent employs light-adjusting layers with spatially varying optical properties, where each region (red, green, blue) has tailored transmission and absorption characteristics optimized for its specific wavelength range. This local optimization maintains high chromatic purity while using practical manufacturing approaches
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 achieves balanced chromatic purity, reduced reflection, and low cost production by using fewer materials and layers, maintaining light-emitting efficiency while enhancing contrast and reducing external light reflection.
Implementation Method 1
a first light-adjusting layer formed above the blue light-emitting region and the non-light emitting region, which selectively transmits the blue light and selectively absorbs the green light and the red light
Implementation Method 2
a second light-adjusting layer formed above the red light-emitting region and the green light-emitting region, which selectively absorbs the blue light and selectively transmits the green light and the red light
Implementation Method 3
a third light-adjusting layer provided above the organic EL unit, in which the third light-adjusting layer has an absorption peak with a local maximum absorption wavelength in a range between 520 and 600 nm
Implementation Method 4
An organic EL display device is a light-emitting display device utilizing electroluminescence of organic compound
Data Source
AI summary
An organic electroluminescent display device which satisfies all of chromatic purity, transmission factor, reduction in reflection, and reflected color in balance at low cost is provided. An organic electroluminescent (EL) display device includes: a main substrate; an organic light-emitting layer formed above the main substrate and including a red light-emitting layer which emits red light, a green light-emitting layer which emits green light, a blue light-emitting layer which emits blue light, and a bank which is a non-light emitting region; a first light-adjusting layer formed above the blue light-emitting layer and the bank, which selectively transmits the blue light and selectively absorbs the green light and the red light; and a second light-adjusting layer formed above the red light-emitting layer and the green light-emitting layer, which selectively absorbs the blue light and selectively transmits the green light and the red light.