Dual-Sided OLED Panel via Semi-Transparent Electrode Microcavity
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Solution Overview
Problem
Organic light-emitting display panels are limited to single-sided display, making them unsuitable for applications requiring dual-sided display, such as billboards along roads that need to display images on both sides.
Innovation Solution
An organic light-emitting display panel design featuring a stack of a first semi-transparent electrode, a light-emitting layer, and a second semi-transparent electrode, where the reflectivity of each electrode is optimized to create a microcavity, enhancing light intensity and enabling dual-sided emission while maintaining a small difference in light intensity between sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional organic light-emitting display panels are used, then the structure is simple and manufacturing is easy, but the panel can only display at a single side
Solution Approach 1:
The panel is divided into multiple independent light-emitting units, each capable of emitting light from both sides. Each unit contains separate light-emitting layers and electrodes configured to enable dual-sided emission, transforming a single-function panel into a multi-functional display system
Solution Approach 2:
The light-emitting units are designed to perform multiple functions: they can emit light from both front and back sides, allowing the same panel structure to serve different display needs (single-sided or dual-sided display) without requiring separate panels for each application
2Illumination intensity
If semi-transparent electrodes with optimized reflectivity are used to create microcavity, then light intensity is enhanced and dual-sided emission is realized, but the electrode structure becomes more complex
Solution Approach 1:
The reflectivity of electrodes is precisely controlled within specific ranges (first electrode: 30%-70%, second electrode: 70%-90%) to optimize microcavity resonance. By adjusting these physical parameters, the system achieves enhanced light intensity and dual-sided emission without fundamentally changing the electrode structure
Solution Approach 2:
The microcavity formed between the two semi-transparent electrodes acts as an optical intermediary, trapping and resonating light waves to enhance extraction efficiency. This intermediate structure enables dual-sided emission by allowing light to resonate and exit through both electrodes
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
The design allows for improved light intensity and uniform display on both sides, enhancing the display effect and making the panel suitable for dual-sided applications.
Implementation Method 1
since each of the first electrode and the second electrode in the organic light-emitting component is a semi-transparent electrode, a microcavity is formed between the two electrodes to enhance a light intensity
Implementation Method 2
each of the plurality of organic light-emitting components comprises a stack of a first electrode, a light-emitting layer and a second electrode
Data Source
AI summary
An organic light-emitting display panel and a display device are provided. The display panel includes a plurality of organic light-emitting components, wherein each of the plurality of organic light-emitting components comprises a first electrode, a light-emitting layer and a second electrode that are arranged by stacking, the first electrode has a reflectivity of R1, and the second electrode has a reflectivity of R2, R1 and R2 satisfy:{I1=F(R1,R2,λ,X1,L)×I0I2=F′(R1,R2,λ,X2,L)×I0I1I0-I2I0<0.13,wherein I1 is a light intensity at a side of the first electrode, I2 is a light intensity at a side of the second electrode, I0 is an intrinsic light intensity of the light-emitting layer, λ is a wavelength of light emitted by the light-emitting layer, X1 is a distance between an exciton recombination center in the light-emitting layer and the first electrode, and L is a length of a microcavity between the first electrode and the second electrode, wherein X1+X2=L.