Ambient Light Reflection Preventing Unit for OLED Displays
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Solution Overview
Problem
Organic light emitting display devices face low visibility in outdoor environments due to ambient light reflection from metal layers, which existing solutions like circular polarizers address but increase manufacturing complexity, especially for flexible displays.
Innovation Solution
An organic light emitting display device incorporating an ambient light reflection preventing unit with a stacked structure of dielectric and metal layers, integrated with a photovoltaic unit, which uses destructive interference to minimize reflection and includes a light blocking member to prevent ambient light from reaching the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is used to prevent ambient light reflection, then visibility in outdoor environment is improved, but the polarization element is thick and manufacturing complexity increases
Solution Approach 1:
The patent extracts the light reflection prevention function from a thick circular polarizer and implements it through a thin-film stacked structure consisting of alternating dielectric and metal layers, thereby reducing thickness and manufacturing complexity while maintaining the anti-reflection effect
Solution Approach 2:
The patent changes the structural parameters by using multiple thin layers with specific thicknesses (first dielectric layer: 50-150nm, first metal layer: 10-50nm, second dielectric layer: 50-150nm) to achieve destructive interference of reflected light, replacing the thick polarizer structure
2Device complexity
If a black thin film with alternating dielectric and metal layers is used to replace circular polarizer, then thickness is reduced and manufacturing complexity decreases, but photovoltaic functionality is lost
Solution Approach 1:
The patent makes the stacked structure serve multiple functions: the alternating dielectric and metal layers simultaneously provide anti-reflection properties and photovoltaic energy generation capability, eliminating the need for separate components
Solution Approach 2:
The patent merges the anti-reflection function and photovoltaic function into a single integrated structure where the same stacked layers perform both light interference and energy conversion tasks
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 ambient light reflection, enabling improved visibility in outdoor conditions while maintaining the flexibility of the display device and integrating photovoltaic functionality, thus overcoming the limitations of traditional polarization methods.
Implementation Method 1
uses destructive interference to minimize reflection
Implementation Method 2
an ambient light reflection preventing unit capable of photovoltaic generation
Data Source
AI summary
An organic light emitting display device including an organic light emitting element disposed on an insulation substrate, and an ambient light reflection preventing unit disposed on the organic light emitting element, the ambient light reflection preventing unit including a first metal layer, a first dielectric layer disposed on the first metal layer, the first metal layer and the first dielectric layer contacting each other, and a photovoltaic unit including the first metal layer as a first electrode.