OLED Light Shielding Patterns and Loss Inducing Layer
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face a challenge in reducing external light reflection while minimizing light loss from the organic light emitting layer, often requiring a circular polarizer that decreases overall luminance.
Innovation Solution
The implementation of an organic light emitting diode structure that includes a substrate, an anode, a bank, an organic light emitting layer, a cathode, light shielding patterns, and a light loss inducing layer. The light loss inducing layer is positioned between the light shielding patterns and overlaps the emission area, reducing the emission of reflected external light while minimizing light loss from the organic light emitting layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is used to reduce external light reflection, then external light reflectivity is reduced, but overall luminance is reduced by 50% or more
Solution Approach 1:
The patent divides the light control function into two separate components: light shielding patterns that block reflected light paths and a light loss inducing layer that selectively absorbs specific light. This segmentation allows each component to perform its function optimally without the luminance loss associated with circular polarizers.
Solution Approach 2:
The light loss inducing layer is positioned specifically in regions where reflected light exits the device, rather than uniformly across the entire display. This localized approach ensures that only reflected light is absorbed while emitted light from the OLED passes through unaffected, maintaining high luminance.
2Object-affected harmful factors
If light shielding patterns are added to block reflected light, then external light reflection is reduced, but device complexity increases
Solution Approach 1:
The light loss inducing layer is integrated with existing OLED structures such as the encapsulation layer or touch sensor layer, rather than being added as a completely separate component. This merging approach reduces device complexity while maintaining the light reflection suppression function.
Solution Approach 2:
The light loss inducing layer serves multiple functions: it suppresses external light reflection, maintains display luminance, and can be integrated with touch sensor structures. This multi-functionality reduces the need for additional separate components, simplifying the overall device structure.
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 solution effectively suppresses external light reflection and reduces light loss from the organic light emitting layer, enhancing the overall luminance and efficiency of the OLED without the need for a circular polarizer.
Implementation Method 1
a plurality of light shielding patterns configured to absorb light incident on the plurality of light shielding patterns
Implementation Method 2
a light loss inducing layer configured to reduce emission of reflected external light
Data Source
AI summary
An organic light emitting diode which suppresses external light reflection while reducing loss of light generated in an organic light emitting layer is disclosed. An organic light emitting diode includes a substrate, an anode on the substrate, a bank on the anode and exposing a part of the anode to define an emission area, an organic light emitting layer on the emission area and the bank, a cathode on the organic light emitting layer, a plurality of light shielding patterns on the cathode and overlapping the bank, and a light loss inducing layer located on a same plane as the plurality of light shielding patterns and disposed between a pair of light shielding patterns from the plurality of light shielding patterns, the light loss inducing layer having has a same thickness as a thickness of that of the plurality of light shielding patterns, and overlaps the emission area.