Flexible Display Black Organic Layer for Light Absorption
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Solution Overview
Problem
Organic light-emitting display devices face challenges in reducing external light reflectivity, which affects display quality and visibility, especially in outdoor settings, and existing solutions like polarization plates increase thickness and reduce brightness.
Innovation Solution
A display device structure incorporating flexible plastic layers, a thin black organic layer for light absorption, and a light shield with color filters, along with a micro cavity structure and reflection prevention auxiliary layers, to minimize external light reflectivity without the need for polarization plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarization plate is used to reduce external light reflectivity, then display quality is improved, but device thickness increases and brightness is reduced
Solution Approach 1:
The patent removes the polarization plate from the display device structure entirely, replacing it with a black organic layer that directly absorbs external light. This extraction of the harmful component (polarization plate) eliminates the thickness increase and brightness reduction problems while still achieving the goal of reducing external light reflectivity through the black organic layer's light absorption properties
Solution Approach 2:
The patent changes the optical parameters of the display device by introducing a black organic layer with specific light absorption characteristics. This layer has high absorption coefficient for external light, transforming the approach from polarization-based reflection reduction to absorption-based reflection reduction, thereby maintaining thin profile while improving outdoor visibility
2Object-affected harmful factors
If a polarization plate is used to reduce external light reflectivity, then display quality is improved, but brightness is reduced
Solution Approach 1:
By removing the polarization plate and replacing it with a black organic layer, the patent eliminates the brightness reduction effect caused by polarization filtering. The black organic layer absorbs external light without significantly affecting the brightness of the self-luminous organic light-emitting display, thereby maintaining high illumination intensity while reducing external light reflectivity
Solution Approach 2:
The patent uses a composite structure combining the black organic layer with the organic light-emitting materials. The black organic layer serves as a light absorption component that selectively absorbs external light while allowing the organic light-emitting display to maintain its high brightness output, creating a composite system that achieves both goals
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 effectively reduces external light reflectivity, enhances display quality, and maintains brightness, improving visibility in outdoor conditions without increasing the device's thickness.
Implementation Method 1
a black organic layer between the first and second plastic layers
Implementation Method 2
Light reflected by the opposite electrode may destructively interfere with light reflected by the reflection prevention auxiliary layer
Data Source
AI summary
A display device includes a substrate including a first plastic layer, a second plastic layer on the first plastic layer, and a black organic layer between the first and second plastic layers, a buffer layer on the substrate, a thin film transistor on the buffer layer, and a plurality of display elements electrically, at least one of the display elements being connected to the thin film transistor, the display elements respectively being arranged in a plurality of pixels.