Reflective Layer Light Extraction OLED Display
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Solution Overview
Problem
Organic light emitting diode (OLED) displays experience significant light loss as light emitted from the organic light emitting layer passes through various components, leading to reduced light extraction efficiency.
Innovation Solution
A light encapsulation structure is formed by placing a reflective layer in contact with a second electrode in the non-emission area of the OLED display device, which reflects trapped light back to the emission area for extraction, thereby enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light passes through several components in the OLED display device, then the display device can function properly, but considerable light loss occurs
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the reflective layer to redirect trapped light that would otherwise be lost into the emission area where it can contribute to display output. The reflective layer converts the harmful effect of light trapping into a beneficial light extraction mechanism, thereby reducing light loss while maintaining display functionality.
2Productivity
If a reflective layer is placed in contact with the second electrode in the non-emission area, then light extraction efficiency is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the reflective layer with the second electrode structure by placing the reflective layer in contact with the second electrode in the non-emission area. This integration combines multiple functions into a unified structure, enhancing light extraction efficiency while avoiding the need for separate complex components. The reflective layer and second electrode work together as an integrated unit, simplifying the overall device architecture.
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 approach mitigates light loss and improves light extraction efficiency by redirecting trapped light from the non-emission area back to the emission area, increasing the overall brightness and effectiveness of the OLED display.
Implementation Method 1
A light encapsulation structure is formed by placing a reflective layer in contact with a second electrode in the non-emission area of the OLED display device, which reflects trapped light back to the emission area for extraction
Data Source
AI summary
A display device and a method for manufacturing the same capable of mitigating light loss by comprising a substrate, an overcoat layer disposed on the substrate, a first electrode disposed on the overcoat layer, a reflective layer disposed on the overcoat layer to be spaced apart from the first electrode, a bank layer disposed on the first electrode and the reflective layer to cover en edge of the first electrode, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer and contacting an end of the reflective layer.