Light-Scattering Filling Member for OLED Viewing Angle and Luminance
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Solution Overview
Problem
Organic light-emitting display apparatuses face challenges in maintaining wide viewing angles and minimizing luminance deterioration, which are critical for next-generation display technology.
Innovation Solution
Incorporating a filling member with light-scattering particles having a refractive index difference of 0.1 to 0.2 from the filling member, typically silicone-based with polydimethylsiloxane, and using materials like methyl silicone, phenyl silicone, or polystyrene, to improve viewing angles and reduce luminance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a filling member is used to improve wide viewing angle, then viewing angle is improved, but luminance deterioration occurs
Solution Approach 1:
The filling member is constructed as a composite material combining silicone base material with dispersed light-scattering particles (polystyrene, methyl silicone, or phenyl silicone). This composite structure enables the filling member to simultaneously provide wide viewing angle through light scattering while maintaining luminance by controlling the refractive index difference between the base material and particles within 0.1 to 0.2.
Solution Approach 2:
The invention optimizes the refractive index parameters by selecting specific light-scattering particles with refractive indices carefully matched to the silicone base material (difference of 0.1 to 0.2). This parameter control allows the filling member to achieve both wide viewing angle and minimal luminance deterioration, resolving the technical contradiction between these two optical properties.
2Adaptability or versatility
If light-scattering particles are added to improve viewing angle, then viewing angle is enhanced, but luminance is reduced
Solution Approach 1:
The light-scattering particles are dispersed throughout the filling member to provide localized light scattering functionality. This local quality approach enables the filling member to scatter light effectively for wide viewing angle while the controlled refractive index difference ensures that luminance is not significantly reduced, balancing both optical requirements.
Solution Approach 2:
By changing the refractive index parameter of the light-scattering particles to be within 0.1 to 0.2 difference from the silicone base material, the invention optimizes the light scattering efficiency. This parameter optimization ensures effective viewing angle enhancement while minimizing luminance loss, resolving the contradiction between these two optical properties.
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 enhances the wide viewing angle and minimizes luminance deterioration, achieving improved performance by optimizing the refractive index difference and content of light-scattering particles within the filling member.
Implementation Method 1
light-scattering particles in the filling member, wherein a difference between a refractive index of the filling member and a refractive index of the light-scattering particles is about 0.1 to about 0.2
Implementation Method 2
a difference between a refractive index of the filling member and a refractive index of the light-scattering particles is about 0.1 to about 0.2
Data Source
AI summary
An organic light-emitting display apparatus including a display unit on a substrate, an encapsulating substrate facing the substrate and the display unit, a filling member between the display unit and the encapsulating substrate, and light-scattering particles in the filling member wherein a difference between a refractive index of the filling member and a refractive index of the light-scattering particles is within a set range refractive index numbers.