Organic Light-Emitting Display Optical Path Converter
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Solution Overview
Problem
Current organic light-emitting display devices face limitations in emission efficiency and emission area, as they struggle to effectively utilize light emitted from organic light-emitting layers due to the geometry and refractive indices of optical path converters.
Innovation Solution
The integration of a substrate with a first organic light-emitting layer, a pixel defining film, and an optical path converter comprising a first optical path converting member with a higher refractive index and a second optical path converting member with a lower refractive index, where the first optical path converting member has a trapezoidal cross-sectional shape and the second member surrounds its side surfaces, enhancing light emission by refracting light vertically and increasing the emission area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional optical path converter with single refractive index is used, then the device structure is simple, but the emission efficiency is limited
Solution Approach 1:
The optical path converter is divided into multiple members with different refractive indices (first optical path converting member with higher refractive index, second optical path converting member with lower refractive index). This segmentation allows each member to perform specific optical functions, improving light extraction efficiency while maintaining manageable structural complexity.
Solution Approach 2:
Different regions of the optical path converter are assigned different refractive indices based on their functional requirements. The first optical path converting member with higher refractive index is positioned to maximize light extraction from the organic light-emitting layer, while the second member with lower refractive index optimizes light direction, creating local optical quality optimization.
2Productivity
If the optical path converter uses complex geometry, then light extraction efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The optical path converting members utilize curved or rounded geometric features rather than sharp angles or complex irregular shapes. This curvature approach maintains effective light extraction while being more tolerant to manufacturing variations and easier to fabricate with standard processes.
Solution Approach 2:
Instead of relying on complex geometric configurations, the invention optimizes light extraction by changing material parameters (refractive indices) and simple geometric parameters (thickness, area ratios). This approach achieves high extraction efficiency while reducing sensitivity to precise dimensional control.
3Area of stationary object
If the emission area is enlarged, then the display area increases, but light uniformity and control become more difficult
Solution Approach 1:
The optical path converter extends in multiple dimensions with the first and second optical path converting members arranged in different spatial configurations. This multi-dimensional arrangement allows uniform light distribution across enlarged emission areas by controlling light propagation from multiple directions and planes.
Solution Approach 2:
The combination of optical path converting members with different refractive indices creates a homogeneous light distribution pattern across the emission area. The higher refractive index member extracts light efficiently while the lower refractive index member distributes it uniformly, maintaining consistent brightness across enlarged display areas.
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 improves emission efficiency and enlarges the emission area of the organic light-emitting display device by effectively refracting and directing light emitted from the organic light-emitting layers, resulting in enhanced optical efficiency and reduced blurring between adjacent emission areas.
Implementation Method 1
an optical path converter on the pixel defining film and overlapping with the first organic light-emitting layer, the optical path converter including a first optical path converting member having a first refractive index and a second optical path converting member having a second refractive index that is lower than the first refractive index
Implementation Method 2
a second optical path converting member surrounding the first and second side surfaces of the first optical path converting member
Data Source
AI summary
An organic light-emitting display device includes: a substrate; a first organic light-emitting layer disposed on the substrate; a pixel defining film disposed on the first organic light-emitting layer and having a first opening, which at least partially exposes the first organic light-emitting layer; and an optical path converter disposed on the pixel defining film to overlap with the first organic light-emitting layer and including a first optical path converting member, which has a first refractive index, and a second optical path converting member, which has a second refractive index that is lower than the first refractive index.