Display Anti-Reflection Layer Stack for Quantum Dot Color Interference
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Solution Overview
Problem
Existing electronic devices with quantum dots struggle to achieve optimal display quality due to unwanted reflectance characteristics, particularly in specific wavelength ranges, which affect the perceived color and viewing angle.
Innovation Solution
An anti-reflection member with a multi-layer structure, comprising a base layer, a hard coating layer, and optical layers with varying refractive indices, is integrated into the display module to control reflectance, specifically designed to have an SCI reflectance of 4% to 7% for wavelengths between 350 nm and 370 nm, and minimal reflectance for other ranges to enhance display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an anti-reflection member is used to reduce reflectance, then display quality is improved, but reflectance in specific wavelength ranges (350-370 nm) increases
Solution Approach 1:
The anti-reflection member is divided into multiple optical layers (first optical layer with higher refractive index and second optical layer with lower refractive index) with different refractive index characteristics. This segmentation allows each layer to control reflectance in different wavelength ranges, thereby reducing overall reflectance in the problematic 350-370 nm range while maintaining display quality.
Solution Approach 2:
Different optical layers are designed with specific local optical properties (refractive indices) tailored to control reflectance in specific wavelength ranges. The first optical layer targets shorter wavelengths while the second optical layer addresses longer wavelengths, creating localized control over reflectance characteristics across the spectrum.
2Manufacturing precision
If quantum dots are employed to improve display quality, then color performance is enhanced, but unwanted reflectance characteristics occur
Solution Approach 1:
The anti-reflection member acts as an intermediary layer between the quantum dot display and the external environment. It mediates the interaction between incident light and the display structure, controlling reflectance characteristics without interfering with the quantum dot light emission and color performance.
3Object-generated harmful factors
If a multi-layer optical structure is used to control reflectance, then reflectance characteristics are improved, but device complexity increases
Solution Approach 1:
The complex reflectance control function is extracted into a separate anti-reflection member with multiple optical layers, rather than integrating it directly into the display structure. This extraction allows for optimized reflectance control while keeping the main display structure relatively simple and modular.
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 anti-reflection member effectively reduces unwanted reflectance, ensuring neutral black appearance in power-off states and improved display quality by minimizing color interference and enhancing light efficiency across various viewing angles.
Implementation Method 1
an anti-reflection member disposed on the display module, the anti-reflection member having a Specular Component Included (SCI) reflectance in a range of about 4% to about 7% with respect to light having a wavelength in a range of about 350 nm to about 370 nm
Implementation Method 2
a first optical layer disposed on the hard coating layer, the first optical layer having a first refractive index, and a second optical layer disposed on the first optical layer, the second optical layer having a second refractive index that is smaller than the first refractive index
Data Source
AI summary
Provided is an electronic device including a display module, and an anti-reflection member disposed on the display module and having an SCI reflectance in a range of about 4% to about 7% with respect to light having a wavelength in a range of about 350 nm to about 370 nm. The anti-reflection member includes a base layer, a hard coating layer disposed on the base layer, a first optical layer disposed on the hard coating layer and having a first refractive index, and a second optical layer disposed on the first optical layer and having a second refractive index that is smaller than the first refractive index.