OLED Light-Guiding Structure for Extracting Light Through Encapsulation
Solution Overview
Problem
In OLED encapsulation structures, the long optical path of light emission results in significant light loss due to total reflection at multiple interfaces, leading to low light utilization and emitting ratios.
Innovation Solution
A light-emitting device with a light-guiding structure comprising first structures with a higher refractive index, positioned between the light-emitting unit and the encapsulation cover plate, which enables light to be incident and exit through the encapsulation cover plate, reducing the optical path and interface reflections by using a second structure with a lower refractive index to cover side surfaces of the first structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted in all directions through the encapsulation structure, then light can exit from multiple surfaces, but the long optical path causes significant light loss due to total reflection at multiple interfaces
Solution Approach 1:
The encapsulation structure is segmented into multiple functional layers: a base substrate, a light-emitting unit, an encapsulation cover plate, and a light-guiding structure. The light-guiding structure is further segmented into first structures (with higher refractive index) and second structures (with lower refractive index), creating distinct optical zones that control light propagation paths and reduce total reflection losses
Solution Approach 2:
The light-guiding structure acts as an intermediary between the light-emitting unit and the encapsulation cover plate. By introducing this intermediate layer with specific refractive index characteristics, the patent mediates the optical transition and reduces total reflection at the interfaces, thereby improving light extraction efficiency
2Illumination intensity
If a light-guiding structure with first structures is introduced to improve light extraction, then light utilization increases, but the device structure becomes more complex
Solution Approach 1:
The light-guiding structure performs multiple functions simultaneously: it guides light from the light-emitting unit, reduces total reflection at interfaces, extracts light efficiently through the encapsulation cover plate, and maintains structural integrity. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
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 enhances light emitting efficiency and utilization by shortening the optical path, reducing light loss, and increasing local brightness and overall light emitting ratios.
Implementation Method 1
A light-emitting device is provided, which includes a base substrate, a light-emitting unit, an encapsulation cover plate and a light-guiding structure... The light-guiding structure is configured to enable light emitted by the light-emitting unit to be incident into the first structures and enable the light to exit from the encapsulation cover plate
Implementation Method 2
the long optical path of light emission results in significant light loss due to total reflection at multiple interfaces
Data Source
AI summary
A light-emitting device and a manufacturing method thereof, and an electronic apparatus are disclosed. The light-emitting device includes: a base substrate, a light-emitting unit, an encapsulation cover plate and a light-guiding structure. The light-emitting unit is on the base substrate; the encapsulation cover plate is opposite to the base substrate and covers the light-emitting unit; and the light-guiding structure is at a light exiting side of the light-emitting unit and includes a plurality of first structures. The light-guiding structure is configured to enable light emitted by the light-emitting unit to be incident into the first structures and enable the light to exit from the encapsulation cover plate.