Transparent Region Refractive Index Matching in OLED Displays
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Solution Overview
Problem
Conventional transparent organic light emitting display devices face challenges in increasing transmissivity due to different refractive indexes of structures in the transparent region, leading to decreased image definition.
Innovation Solution
Incorporating a light transmitting member with a refractive index matching the first and second substrates, positioned in the transparent region, to minimize light refraction and enhance transmissivity, while removing insulating layers and electrodes from the transparent region to reduce interlayer interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If structures (lower substrate, insulating layer, upper substrate, nitrogen space) are positioned on the transparent region, then the device structure is complete and functional, but light refraction occurs at interfaces due to different refractive indexes, reducing image definition
Solution Approach 1:
The patent applies homogeneity by making the light transmitting member have substantially the same refractive index as the first and second substrates. This creates optical homogeneity across the transparent region, eliminating refraction at interfaces while maintaining the complete device structure with all necessary components.
Solution Approach 2:
The light transmitting member acts as an intermediary element between the first and second substrates. By positioning this member with matched refractive index at the transparent region, it mediates the optical path to prevent refraction, allowing light to pass through without distortion while still permitting the presence of other structural elements.
2Illumination intensity
If insulating layers and electrodes are removed from the transparent region, then light refraction is minimized and transmissivity is increased, but device functionality may be compromised
Solution Approach 1:
The patent applies segmentation by spatially separating functional elements from the transparent region. Insulating layers and electrodes are positioned only in the pixel region where they are needed for device operation, while the transparent region remains free of such elements. This segmentation allows the transparent region to maintain high transmissivity without compromising device functionality in the pixel region.
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 increases transmissivity and image definition by ensuring light is not refracted at the interfaces, thereby improving the clarity of images behind the display device.
Implementation Method 1
The light is not refracted in interfaces between the light transmitting member and the first substrate and between the light transmitting member and the second substrate
Data Source
AI summary
An organic light emitting display device includes a first substrate, a light emitting structure, a light transmitting member, and a second substrate. The first substrate includes a pixel region and a transparent region. The light emitting structure is positioned in the pixel region of the first substrate. The light transmitting member is positioned in the transparent region. The second substrate is disposed on the light emitting structure and the light transmitting member. The light is not refracted in interfaces between the light transmitting member and the first substrate and between the light transmitting member and the second substrate.