Thin Antireflective Layer for Foldable Display Reflection Control
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Solution Overview
Problem
Existing display devices with polarization films are thick, limiting their rollability and foldability, and the films tend to strip when the devices are repeatedly rolled or bent.
Innovation Solution
A display device with a thin anti-reflection layer made of light-absorbing materials like amorphous carbon, polymers, metals, or graphite, which is deposited using chemical vapor deposition, and optionally accompanied by interface layers and encapsulation layers to manage refractive indices and light absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarization film is used to prevent reflection of external light, then the anti-reflection function is improved, but the thickness of the display device increases
Solution Approach 1:
The patent extracts only the essential light absorption function from the complex polarization film structure (which includes linear polarization film and 1/4 wavelength phase retardation film). By using a simple light-absorbing material layer instead of the complete polarization film assembly, the invention achieves anti-reflection functionality while dramatically reducing thickness.
Solution Approach 2:
The patent employs a thin light-absorbing material layer that can be deposited as a simple coating, replacing the thick, multi-layer polarization film. This approach uses a simpler, thinner structure that achieves the same functional purpose without the bulk of traditional polarization films.
2Object-affected harmful factors
If a thick polarization film is used for anti-reflection, then the reflection prevention is improved, but the rollability and foldability of the display device are limited
Solution Approach 1:
The invention extracts only the light absorption capability from the polarization film structure, discarding the bulky multi-layer construction. This extracted function is implemented as a thin light-absorbing material layer that does not interfere with the mechanical flexibility needed for rolling and folding operations.
Solution Approach 2:
The patent uses a thin light-absorbing material layer that can be integrated into the flexible display structure. This thin film approach is compatible with flexible substrates and does not prevent the display from being rolled or folded, unlike thick rigid polarization films.
3Object-affected harmful factors
If a thick polarization film is applied to rollable or foldable display devices, then anti-reflection function is provided, but the polarization film is stripped when rolling or bending is repeated
Solution Approach 1:
The patent extracts the essential light absorption function from the polarization film and implements it as a thin light-absorbing material layer. This thinner structure is more resilient to mechanical stress from repeated rolling and bending, preventing the stripping problem that occurs with thick polarization films.
Solution Approach 2:
The invention changes the thickness parameter of the anti-reflection layer from thick (polarization film) to thin (light-absorbing material layer). This parameter change improves mechanical durability and resistance to stripping during repeated flexing operations while maintaining the light absorption function.
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
Enables the creation of rollable or foldable display devices with a thin anti-reflection layer that prevents stripping and adjusts reflectance similar to or better than traditional polarization films, while maintaining a thin profile.
Implementation Method 1
the anti-reflection layer including a light-absorbing material
Implementation Method 2
a light-absorbing material layer which is formed to have a thin thickness through a chemical vapor deposition process
Data Source
AI summary
The present inventive concept provides a display device comprising: a first electrode provided on a substrate; a light-emittinglayer provided on the first electrode; a second electrode provided on the light-emitting layer; and an antireflective layer, which isprovided on the second electrode and comprises a light-absorbing material, wherein the light-absorbing material comprises at leastone selected from the group consisting of amorphous carbon (a-C), a polymer, a monomer, metal and graphite.