OLED Packaging Scattering Layer Viewing Angle
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Solution Overview
Problem
The refractive index mismatch between inorganic and organic packaging layers in OLED display panels leads to light refraction and total reflection issues, affecting luminous efficiency and display performance, especially at larger viewing angles.
Innovation Solution
Incorporating scattering particles within the organic packaging layer or using a gradient refractive index scattering layer between the inorganic and organic packaging layers to control light refraction and reduce total reflection, thereby enhancing viewing angles and display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first inorganic packaging layer with high refractive index is used, then packaging effectiveness is improved, but light refraction angle increases causing total reflection and reduced luminous efficiency
Solution Approach 1:
The patent introduces a first scattering layer as an intermediary between the inorganic packaging layer and the organic packaging layer. This scattering layer has a refractive index that forms a gradient transition, mediating the optical transition between the two packaging layers and reducing total internal reflection at their interface.
Solution Approach 2:
The patent changes the refractive index parameter by introducing a scattering layer with refractive index between that of the inorganic and organic packaging layers. This parameter transition creates a gradient that reduces optical impedance mismatch and minimizes light reflection losses.
2Reliability
If a first inorganic packaging layer with high refractive index is used, then packaging effectiveness is improved, but viewing angle is limited due to total reflection
Solution Approach 1:
The first scattering layer acts as an optical intermediary that enables wider viewing angles by reducing total internal reflection. Its intermediate refractive index allows light to pass through at greater angles while maintaining packaging effectiveness.
Solution Approach 2:
The patent applies local quality by placing the scattering layer specifically at the interface where optical transitions occur. This localized intervention addresses the viewing angle limitation without compromising the overall packaging structure.
3Illumination intensity
If scattering particles are added to the organic packaging layer, then light scattering is improved, but device complexity increases
Solution Approach 1:
The patent creates a composite packaging structure by combining the inorganic packaging layer, the scattering layer with scattering particles, and the organic packaging layer. This composite approach achieves improved light scattering while maintaining a relatively simple overall device structure.
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 solution effectively enlarges the viewing angle and improves display performance by scattering light more uniformly, preventing total reflection and maintaining luminous efficiency across various viewing angles.
Implementation Method 1
the first organic packaging layer includes a plurality of scattering particles... scattering light more uniformly, preventing total reflection
Implementation Method 2
a refractive index of the first scattering layer decreases in gradient along a direction from the first inorganic packaging layer to the first organic packaging layer
Data Source
AI summary
An organic light-emitting display panel, includes an array substrate including a flexible substrate and a thin film transistor layer placed on the flexible substrate; an organic light-emitting component placed on the array substrate, including a plurality of light-emitting units; a packaging layer placed on aside of the organic light-emitting component away from the array substrate, the packaging layer including a first inorganic packaging layer and a first organic packaging layer, the first inorganic packaging layer and the first organic packaging layer being placed in order on a side of the packaging layer along a direction away from the array substrate; wherein the first organic packaging layer includes a plurality of scattering particles, refractive indexes of the first inorganic packaging layer, the first organic packaging layer and the scattering particle are defined as n1, n2 and n3 respectively, and n2 is different from n3.