Scattering Layer for Foldable Display Light Reflection
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Solution Overview
Problem
Display devices face challenges in reducing external light reflection while maintaining excellent folding reliability and durability, especially in flexible and foldable forms.
Innovation Solution
A display device structure incorporating a scattering layer with a polymer resin and liquid crystal molecules, where the alignment directions of the liquid crystal molecules are fixed, is used. This scattering layer is formed by dispersing liquid crystal molecules in a polymer resin and using a reactive mesogen to polymerize and align them, reducing external light reflection and enhancing folding reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional optical layer is used, then the display device can maintain basic optical functionality, but external light reflection is not effectively reduced
Solution Approach 1:
The scattering layer uses a composite material system consisting of polymer resin and liquid crystal molecules. The polymer resin provides structural integrity and flexibility for folding, while the liquid crystal molecules provide optical scattering functionality to reduce external light reflection. This composite approach allows simultaneous achievement of both folding reliability and reduced reflection.
Solution Approach 2:
The patent controls the transmittance parameter of the scattering layer to be 50-100% and haze to be 1-50%, optimizing the balance between light transmission and scattering. By adjusting these parameters, the layer effectively reduces external light reflection while maintaining sufficient light transmission for display quality, without compromising the flexibility needed for folding.
2Object-affected harmful factors
If a scattering layer with liquid crystal molecules is introduced, then external light reflection is reduced, but the structural complexity increases
Solution Approach 1:
The scattering layer merges multiple functions into a single integrated layer: it provides light scattering to reduce external reflection, maintains optical transmittance for display quality, and offers mechanical flexibility for folding. This consolidation reduces overall device complexity compared to using separate layers for each function.
Solution Approach 2:
By optimizing the transmittance (50-100%) and haze (1-50%) parameters, the scattering layer achieves effective external light reduction without requiring excessive structural complexity. The controlled parameter ranges allow the layer to perform multiple functions efficiently within a single integrated structure.
3Object-affected harmful factors
If the scattering layer thickness is increased, then external light reflection is more effectively reduced, but the display quality and folding flexibility deteriorate
Solution Approach 1:
The patent optimizes the scattering layer thickness parameter to balance external light reflection reduction with display quality maintenance. By controlling thickness within specific ranges and adjusting transmittance (50-100%) and haze (1-50%), the layer achieves effective reflection reduction without excessive thickness that would degrade display quality or folding flexibility.
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 reduces external light reflection and improves the display device's folding reliability by scattering incident light, maintaining high transmittance and low haze, thus enhancing display quality and durability.
Implementation Method 1
a scattering layer disposed on the optical layer, wherein the scattering layer includes a polymer resin and a plurality of droplets dispersed in the polymer resin, and the plurality of droplets each includes a plurality of liquid crystal molecules
Implementation Method 2
a reactive mesogen which fixes the plurality of liquid crystal molecules
Implementation Method 3
alignment directions of the plurality of liquid crystal molecules may be fixed in the same direction
Data Source
AI summary
A display device includes a display panel including a pixel-defining film in which a plurality of pixel openings is defined, and a light-emitting layer disposed in each of the plurality of pixel openings, an optical layer disposed on the display panel and including at least one of a dye or a pigment, and a scattering layer disposed on the optical layer. Since the scattering layer includes a polymer resin and a plurality of droplets dispersed in the polymer resin, and the plurality of droplets each includes a plurality of liquid crystal molecules and a reactive mesogen for fixing the plurality of liquid crystal molecules.