Optical Path Change Layer for Display Color Mixing Suppression
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Solution Overview
Problem
Existing display devices face challenges in achieving improved color reproducibility (gamut) while minimizing external light reflectance and preventing color mixing between pixels.
Innovation Solution
A display device is designed with a first substrate having a plurality of pixels, a second substrate facing the first substrate, and an optical path change layer disposed between them. The optical path change layer includes a high refractive pattern portion with a refractive index of 1.4 or more, which absorbs green and red wavelength light and transmits blue wavelength light, and an air gap as a low refractive portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional display structure is used, then the device is simple and easy to manufacture, but color mixing between adjacent pixels occurs and external light reflectance is high
Solution Approach 1:
The optical path change layer is segmented into multiple pattern portions (first pattern portion with high refractive index and blue colorant, second pattern portion with low refractive index) that are disposed between adjacent pixels. This segmentation allows each pattern portion to independently control light paths from different pixels, preventing color mixing while maintaining manufacturability through patterned deposition techniques.
Solution Approach 2:
Different regions of the optical path change layer are assigned different optical properties: the first pattern portion has high refractive index (1.4 or more) and contains blue colorant to absorb green and red light while transmitting blue light, whereas the second pattern portion has low refractive index. This local differentiation of optical properties enables precise control over light paths and external light reflection in different spatial regions.
2Manufacturing precision
If the first pattern portion absorbs green and red wavelength light and transmits blue wavelength light, then color mixing between pixels is prevented, but the device complexity increases
Solution Approach 1:
The first pattern portion incorporates blue colorant that selectively absorbs green and red wavelength light while transmitting blue wavelength light. This color-selective optical property prevents color mixing between adjacent pixels by filtering out unwanted wavelengths, achieving improved color reproducibility through material composition rather than complex structural arrangements.
Solution Approach 2:
The optical path change layer employs composite material structures combining materials with different refractive indices and optical absorption properties. The first pattern portion uses materials with high refractive index (1.4 or more) combined with blue colorant, while the second pattern portion uses materials with low refractive index, creating a composite structure that simultaneously controls light absorption, transmission, and reflection properties.
3Length of moving object
If the optical path change layer is made thin (thickness ≤ 5 μm), then the display device achieves thin and lightweight structure, but manufacturing precision becomes more challenging
Solution Approach 1:
The optical path change layer is implemented as a thin film structure with thickness of 5 μm or less, enabling the display device to achieve thin and lightweight characteristics. The layer is formed as a continuous or patterned film that can be deposited using thin-film deposition techniques, maintaining structural integrity and optical functionality despite the reduced thickness.
Solution Approach 2:
The optical path change layer parameters (thickness, refractive index, colorant concentration) are precisely controlled within specific ranges to achieve the desired optical performance in a thin structure. The thickness is limited to 5 μm or less, the refractive index of the first pattern portion is maintained at 1.4 or more, and the blue colorant concentration is optimized to ensure sufficient absorption of green and red light while transmitting blue light effectively.
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
This configuration enhances color reproducibility by preventing color mixing between adjacent pixels and improves image quality by reducing external light reflectance, thereby achieving better display performance.
Implementation Method 1
The first pattern portion may absorb green wavelength light and red wavelength light and may transmit blue wavelength light
Implementation Method 2
an optical path change layer disposed between the first and second substrates and including a first pattern portion and a second pattern portion, wherein the first pattern portion has a first refractive index and includes a blue colorant, and, the second pattern portion has a second refractive index smaller than the first refractive index
Data Source
AI summary
A display device is provided. The display device comprises: a first substrate including a plurality of pixels; a second substrate opposite to the first substrate; and an optical path change layer disposed between the first and second substrates and including a first pattern portion and a second pattern portion, wherein the first pattern portion has a first refractive index and includes a blue colorant, and the second pattern portion has a second refractive index smaller than the first refractive index.