Transparent OLED Insulating Layer Refractive Index Matching
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Solution Overview
Problem
Transparent organic light emitting display devices face challenges in achieving high transmittance and minimizing luminance degradation due to total internal reflection at interfaces with different refractive indices, which affects the passage of external light through the transmissive areas.
Innovation Solution
The implementation of a transparent organic light emitting display device design where insulating layers with refractive indices matching the substrate are extended into the transmissive areas, and multilayered structures are used to minimize total internal reflection, ensuring that layers with different refractive indices are contained within the emissive areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If insulating layers are extended into the transmissive area, then light transmittance is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the configuration of insulating layers between the emissive area and transmissive area. In the transmissive area, insulating layers are extended with refractive index matching to minimize reflection, while in the emissive area, standard insulating layer configuration is maintained. This localized differentiation optimizes light transmittance in the transmissive area without compromising the overall device structure.
2Illumination intensity
If multilayered structures are used to minimize total internal reflection, then light transmittance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs parameter changes by adjusting the refractive index of insulating layers to match the substrate refractive index in the transmissive area. This parameter adjustment minimizes total internal reflection and improves light transmittance. The multilayered structure with controlled refractive indices creates optimal optical conditions without requiring complex manufacturing processes, as the refractive index matching can be achieved through material selection and layer thickness control.
3Illumination intensity
If layers with different refractive indices are contained within the emissive area, then luminance efficiency is maintained, but device structure complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the display device into distinct functional areas: emissive area and transmissive area. Each area has a specialized layer configuration optimized for its function. The emissive area contains layers with different refractive indices to maintain luminance efficiency, while the transmissive area uses refractive index-matched insulating layers to maximize light transmission. This segmentation allows both requirements to be satisfied simultaneously without excessive overall complexity.
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 light transmittance and maintains luminance efficiency by reducing distortion and reflection at interfaces, allowing more external light to pass through while maintaining image visibility.
Implementation Method 1
at least one of the insulating layers is configured such that it is extended from the emissive area into the transmissive area of the sub pixel region. The insulating layer, which is being extended into the transmissive area, has at least some part that has the same refractive index as the first substrate. The same refractive indices between the first substrate and the insulating layer being extended into the transmissive area reduces the total internal reflection at the interface their interface
Data Source
Figure 1a~1c
Figure 1d~2a
Figure 2b~2c
AI summary
A transparent organic light emitting display device and a method of manufacturing the transparent organic light emitting display device are provided. The transparent organic light emitting display device comprises a plurality of sub pixel regions, each having a emissive area and a transmissive area, a thin film transistor disposed in the emissive area, and an organic light emitting element electrically connected to the thin film transistor. While the emissive area emits light to display image on the display device, the transmissive area allows the external light to be passed through the display device so that objects behind the display device can be viewed simultaneously with the displayed image.