Transparent OLED Reflective Electrode Luminance Control
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Solution Overview
Problem
Existing transparent OLED devices suffer from inconsistent luminance between two light-emitting surfaces and inability to individually adjust luminance.
Innovation Solution
A transparent OLED device design featuring a reflective electrode between two transparent electrodes, with an insulating layer to prevent short circuits, allowing for adjustable luminance by controlling the reflective electrode and transparent electrodes independently, and enabling double-sided light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If both the anode and cathode are prepared by using a transparent conductive layer, then the device achieves transparency, but the luminance of two light-emitting surfaces becomes inconsistent and cannot be individually adjusted
Solution Approach 1:
The invention segments the electrode structure by introducing a reflective electrode on one side of the organic functional layer, separating the transparent electrode functions. This allows independent control of light emission on each side while maintaining overall device transparency, resolving the contradiction between luminance consistency and individual adjustability.
Solution Approach 2:
The reflective electrode is positioned locally on one side of the organic functional layer with a specific area ratio (10%-50%), creating asymmetric light management properties. This local modification enables different luminance characteristics on each side of the device while preserving transparency where needed.
2Adaptability or versatility
If a reflective electrode is added to enable individual luminance adjustment, then luminance control flexibility improves, but device structure complexity increases
Solution Approach 1:
The reflective electrode is integrated within the existing multi-layer OLED structure, combining light reflection functionality with the electrode architecture. This merging approach adds luminance control capability without requiring a completely separate control system, thus limiting the increase in overall device complexity.
3Illumination intensity
If the reflective electrode area is increased to improve luminance consistency, then light emission uniformity improves, but transparency of the device decreases
Solution Approach 1:
The invention optimizes the area ratio of the reflective electrode to the organic functional layer within a specific range (10%-50%). This parameter optimization balances the competing requirements of luminance uniformity and device transparency, achieving both goals simultaneously rather than forcing a trade-off.
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
Enables consistent or differential luminance control on both sides of the OLED device, enhancing display capabilities and flexibility in transparent illumination applications.
Implementation Method 1
a reflective electrode being disposed on one side of the organic functional layer
Implementation Method 2
a first transparent electrode and a second transparent electrode being disposed on both sides of the organic functional layer respectively
Data Source
AI summary
The present invention discloses a transparent OLED device, which comprises a plurality of pixels, each pixel comprising an organic functional layer, a first transparent electrode and a second transparent electrode being disposed on both sides of the organic functional layer, a reflective electrode being disposed on one side of the organic functional layer, the area of the reflective electrode being less than that of the organic functional layer. With regard to the transparent OLED device, by providing a reflective electrode, a combination of a light-emitting device over a microdomain is combined with a transparent light-emitting device, such that the luminance on both sides of a transparent OLED device can be respectively adjusted to be the same or different as required. The present invention can be applied to the field of transparent illumination or display.