Transparent OLED Sub-Pixel Segmentation for Large Panel Transmittance
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Solution Overview
Problem
Conventional transparent organic light emitting display devices face challenges in manufacturing large panels due to inadequate cathode performance and limited external light transmittance.
Innovation Solution
The design includes a substrate with sub-pixels having distinct regions for light emission and external light transmission, featuring thin film transistors, specific electrode configurations, and insulating layers with openings to maximize transmittance and prevent interference, allowing for a transparent organic light emitting display device suitable for large displays with high external light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a semi-transparent reflective type thin film is used for the cathode, then the device can be made transparent to some extent, but it is inadequate for manufacturing large panels
Solution Approach 1:
The cathode is segmented into multiple discrete segments spaced apart from each other, rather than using a continuous thin film. This segmentation allows the cathode to function in multiple sub-pixels while maintaining high transparency in the regions between segments, resolving the contradiction between transparency and manufacturability for large panels.
Solution Approach 2:
Different regions of the display device are given different properties: the first region has the organic emission layer for light emission, while the second region has openings in the insulating layer for high external light transmittance. This local differentiation allows the device to achieve both emission functionality and high transparency where needed.
2Illumination intensity
If the device structure is optimized for transparency, then external light transmittance is improved, but image visibility and distortion prevention must be maintained
Solution Approach 1:
The cathode is divided into discrete segments that are spaced apart, creating regions of high transparency between them. This segmentation allows external light to pass through while the segmented cathode structures maintain the necessary electrical functionality for image display, thus preserving both transparency and image visibility.
Solution Approach 2:
The device structure is differentiated into a first region for light emission and a second region for high external light transmittance. The second insulating layer with openings is positioned in the second region to maximize transparency, while the first region maintains the complete structure for image emission, ensuring both transparency and image visibility are achieved in their respective regions.
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 high transmittance of external light while maintaining image visibility, minimizing distortion, and is suitable for large display panels by optimizing electrode placement and insulating layer structure.
Implementation Method 1
an organic emission layer on the first electrode
Implementation Method 2
The second electrode may be formed of a light-reflection material
Data Source
AI summary
An organic light emitting display device includes a substrate, a plurality of sub-pixels on the substrate, each sub-pixel including a first region configured to emit light and a second region configured to transmit external light, a plurality of thin film transistors disposed in the first region of the each sub-pixel, a plurality of first electrodes disposed in the first region of each sub-pixel and electrically connected to the thin film transistors, a first insulating layer on at least a portion of the first region of each sub-pixel to cover a portion of the first electrode, an organic emission layer on the first electrode, a second insulating layer on at least a portion of the second region of each sub-pixel, the second insulating layer including a plurality of openings therein, and a second electrode covering the organic emission layer, the first insulating layer, and the second insulating layer.