Transparent OLED Facing Electrode with Transmissive Windows
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Solution Overview
Problem
Organic light emitting display devices face limitations in transmittance due to metal cathodes, restricting improvements in transparent displays, and existing technologies struggle to achieve uniform transmittance and dual emission capabilities.
Innovation Solution
The design incorporates a substrate with pixels featuring light emitting, transmissive, and circuit regions, with transparent or transflective pixel electrodes and a facing electrode having transmissive windows, allowing for uniform transmittance and dual emission by maximizing external light transmission and reducing image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal cathode is used in the organic light emitting display device, then the device can be manufactured with conventional materials and processes, but the transmittance of the device is restricted and cannot be improved for transparent displays
Solution Approach 1:
The patent extracts the metal cathode from the device structure and replaces it with a transparent conductive layer. This removal of the metal component eliminates the obstruction to light transmission while maintaining the electrical functionality needed for device operation, thereby resolving the contradiction between ease of manufacture and transmittance.
Solution Approach 2:
The patent changes the optical parameter of the cathode layer by transitioning from an opaque metal material to a transparent conductive material. This parameter change enables light transmission through the previously blocking cathode layer, achieving high transmittance while preserving the electrical conduction function required for manufacturing and operation.
2Illumination intensity
If transparent electrodes are used to improve transmittance, then the transmittance increases, but uniform transmissive windows cannot be achieved across pixels
Solution Approach 1:
The patent merges the transmissive window formation process with the pixel electrode formation process by using the same transparent conductive layer for both functions. This integration ensures that the transmissive windows are uniformly formed across all pixels while maintaining high transmittance, as the same material and deposition conditions apply throughout the device.
Solution Approach 2:
The transparent conductive layer serves multiple functions simultaneously: it acts as the cathode providing electrical conduction, forms the transmissive windows for light transmission, and ensures uniform optical properties across all pixels. This multi-functionality resolves the contradiction by achieving both high transmittance and manufacturing precision through a single integrated 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 configuration enhances the transmittance of external light and enables uniform transmissive windows, achieving improved light transmission and dual emission capabilities while preventing image distortion, thus addressing the limitations of existing technologies.
Implementation Method 1
pixels formed on the substrate, each of the pixels including at least one light emitting region for emitting light
Implementation Method 2
at least one transmissive region transmitting external light
Data Source
AI summary
A transparent organic light emitting display device having a uniform transmittance of external light and having uniformly formed transmissive windows in pixels. The device includes a substrate; pixels formed on the substrate, each of the pixels comprising: at least one light emitting region for emitting light; at least one transmissive region for transmitting external light; and at least one circuit region comprising a pixel circuit unit; an insulating layer covering the pixel circuit unit; pixel electrodes formed on the insulating layer in the light emitting region and the transmissive region of each pixel, and electrically connected to the pixel circuit unit; an organic layer formed on the pixel electrodes; and a facing electrode formed on the organic layer, integrally formed over all of the pixels, and having transmissive windows, wherein each of the transmissive windows corresponds to the transmissive region of each of the pixels.