Organic Light-Emitting Display Black Film Light Extraction
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Solution Overview
Problem
In organic light-emitting display devices, light extraction efficiency is reduced due to leakage of secondary light towards the pixel electrode, degrading image quality and luminance, especially in top emission configurations where light is intended to be emitted towards the counter electrode.
Innovation Solution
The implementation of a black film on the substrate opposite to the light emission direction, combined with a reflective film, to block and redirect any leaking light, enhancing light extraction efficiency by ensuring primary light is emitted towards the desired substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a top emission configuration is used to emit light towards the counter electrode, then the display device achieves a compact structure, but light extraction efficiency is reduced due to leakage of secondary light towards the pixel electrode
Solution Approach 1:
The patent converts the harmful secondary light that leaks towards the pixel electrode into a beneficial resource by introducing a reflective film that redirects this leaked light back towards the counter electrode, where it can contribute to the displayed image. This transforms the harmful light leakage into additional useful light output, improving overall light extraction efficiency while maintaining the compact top emission structure
Solution Approach 2:
The reflective film acts as an intermediary element between the leaked light and the counter electrode. By placing this reflective layer on the substrate opposite to the light emission direction, the patent mediates the path of secondary light, redirecting it towards the intended emission direction and preventing complete loss of this light energy
2Device complexity
If secondary light leaks towards the pixel electrode in top emission configurations, then device structure is simplified, but image quality and luminance are degraded
Solution Approach 1:
The reflective film converts the harmful effect of secondary light leakage (which degrades image quality and luminance) into a beneficial contribution to the displayed image. By redirecting this leaked light towards the counter electrode, the patent improves image quality and luminance without adding complex structural elements, maintaining manufacturing simplicity while achieving better performance
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 effectively improves light extraction efficiency, enhancing image quality by reducing light leakage and increasing luminance, resulting in a more reliable organic light-emitting display device.
Implementation Method 1
a black film that is disposed on a substrate opposite to a substrate toward which light generated by the pixel is emitted
Implementation Method 2
a reflective film that is disposed on the substrate on which the black film is disposed from among the first substrate and the second substrate
Data Source
AI summary
An organic light-emitting display device includes a first substrate and a second substrate that face each other, a pixel between the first substrate and the second substrate and the pixel emitting primary light toward one of the first and second substrates, and a black film arranged on another of the first and second substrates. The other of the first and second substrates being opposite to the one of the first and second substrates toward which the primary light is emitted.