Transparent OLED Pixel Layout Balancing Emission and Transmission
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Solution Overview
Problem
Existing transparent display devices face challenges in securing sufficient sizes for both the transmission and emission areas within a limited space, which affects the clarity of background information and the aperture ratio.
Innovation Solution
The transparent display device incorporates a substrate with sub-pixels containing organic light emitting diodes and auxiliary sub-pixels with extended transparent conductive layers, allowing for shared organic emission layers and optimized electrode configurations to manage light emission and transmission effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the emission area is increased to secure a desired aperture ratio, then the display quality is improved, but the transmission area is reduced
Solution Approach 1:
The display device is segmented into multiple sub-pixels (first sub-pixel with reflective layer, second sub-pixel without reflective layer) within a pixel unit. This segmentation allows different regions to serve different functions - the first sub-pixel contributes to emission aperture ratio while the second sub-pixel maintains transmission area, thereby resolving the contradiction between emission area and transmission area.
2Area of stationary object
If the transmission area is increased to improve background recognition, then transparency is improved, but the emission area is reduced
Solution Approach 1:
Different regions within the pixel unit are assigned different local qualities - the first sub-pixel has a reflective layer for enhanced emission, while the second sub-pixel lacks the reflective layer to maximize transmission. This local differentiation allows the overall system to achieve both sufficient emission aperture ratio and adequate transmission area for background recognition.
3Illumination intensity
If auxiliary sub-pixels are added to improve area utilization, then the aperture ratio is improved, but the device complexity is increased
Solution Approach 1:
The first and second sub-pixels are merged within a single pixel unit, sharing common structures such as the substrate, organic emission layer, and electrode patterns. The auxiliary sub-pixel (second sub-pixel) is integrated into the existing pixel structure without requiring completely separate components, thereby improving aperture ratio while minimizing the increase in device 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 enables the securement of sufficient emission and transmission areas, improving the clarity of background information and securing a desired aperture ratio, thus providing a high-quality transparent display device with enhanced design flexibility.
Implementation Method 1
The OLED includes an organic light emitting diode that converts electric energy into light energy. Holes and electrons are injected from the anode and cathode, respectively, and recombined in the emission layer to form excitons, whereby the OLED displays an image when the excitons fall from the excited state to the ground state.
Implementation Method 2
The 1-1 electrode includes a transparent conductive layer and a reflective layer. The reflective layer is configured to reflect light in the sub-pixel area to enhance light emission efficiency.
Implementation Method 3
The 1-2 electrode includes a transparent conductive layer extended from the 1-1 electrode. The transparent conductive layer transmits light while maintaining electrical conductivity across both emission and transmission areas.
Data Source
AI summary
A transparent display device includes a substrate in which a sub-pixel having an organic light emitting diode and an auxiliary sub-pixel adjacent to the sub-pixel and having an auxiliary organic light emitting diode are placed, wherein the organic light emitting diode includes a 1-1 electrode in which a transparent conductive layer and a reflective layer are laminated, and the auxiliary organic light emitting diode includes a 1-2 electrode in which the transparent conductive layer is extended and provided.