Anti-Reflection Layer Design for Micro OLED Display Panels
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Solution Overview
Problem
Existing micro OLED displays face issues with ambient light reflection affecting display quality and lack of protection for the outermost structure.
Innovation Solution
A display panel design incorporating an anti-reflection layer with specific refractive index and thickness, positioned between sub-pixels and a dielectric layer, which cancels ambient light reflections by ensuring the first and second light components are out of phase, and optionally includes a coating layer and auxiliary particles to enhance light transmission and prevent cross-color phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an anti-reflection layer is added to reduce ambient light reflection, then reflection is reduced, but the structure becomes more complex
Solution Approach 1:
An anti-reflection layer with specific refractive index (1.3-1.5) is introduced as an intermediary between the environment and the dielectric layer. This intermediate layer with gradual refractive index transition reduces the abrupt refractive index difference, thereby minimizing ambient light reflection through controlled refraction and interference effects.
Solution Approach 2:
The anti-reflection layer's thickness is precisely controlled to satisfy the optical path difference condition: nd=(2k+1)λ/4, where n is the refractive index, d is the thickness, k is an integer, and λ is the wavelength. By adjusting the thickness parameter, the reflected light waves from different interfaces become out-of-phase, causing destructive interference and reducing overall reflection.
2Illumination intensity
If the anti-reflection layer thickness is optimized for light transmission, then light intensity is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The thickness of the anti-reflection layer is precisely controlled to satisfy the optical path difference condition: nd=(2k+1)λ/4, where n is the refractive index, d is the thickness, k is an integer, and λ is the wavelength. By adjusting the thickness parameter, the reflected light waves from different interfaces become out-of-phase, causing destructive interference and reducing overall reflection.
3Manufacturing precision
If a coating layer is added to prevent cross-color phenomena, then color accuracy is improved, but the structure becomes more complex
Solution Approach 1:
Color filter layers with specific spectral transmission characteristics are applied locally over each sub-pixel region. The coating layer's optical properties are tailored to match the underlying sub-pixel characteristics, allowing precise control of light transmission in different spectral regions and preventing color contamination from adjacent pixels.
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 ambient light reflection, enhances light intensity emitted by pixels, and serves as a protective outermost structure for the display panel, minimizing cross-color and color mixing issues.
Implementation Method 1
the second light is a portion of ambient light sequentially refracted by and passing through the surface of the anti-reflection layer away from the sub-pixels, entering the anti-reflection layer
Implementation Method 2
the first light is a portion of ambient light being reflected by a surface of the anti-reflection layer away from the sub-pixels
Implementation Method 3
the anti-reflection layer has a thickness enabling a first light and a second light to be not in-phase
Data Source
AI summary
A display panel and a method for manufacturing the display panel are provided. The display substrate includes a plurality of sub-pixels; an anti-reflection layer provided on a light-exiting side of the display panel at positions respectively corresponding to the sub-pixels; a dielectric layer provided between the sub-pixels and the anti-reflection layer; the anti-reflection layer has a thickness enabling a first light and a second light to be not in-phase; the first light is a portion of ambient light reflected by a surface of the anti-reflection layer away from the sub-pixel; the second light is a portion of the ambient light sequentially refracted by and passing through the surface of the anti-reflection layer away from the sub-pixel, entering the anti-reflection layer, reflected by an interface between the anti-reflection layer and the dielectric layer, refracted by the surface of the anti-reflection layer away from the sub-pixel and entering environment.