Color-Converting Substrate With Refractive-Index Stacks for Lower Reflectance
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Solution Overview
Problem
Existing display devices face challenges in reducing the reflectance of external light, which affects display quality.
Innovation Solution
A color conversion substrate is designed with specific light transmitting and light blocking areas, and stacks with controlled refractive indices, incorporating color filters and wavelength conversion patterns to manage light transmission and conversion efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional display device structures are used, then device simplicity is maintained, but external light reflectance remains high affecting display quality
Solution Approach 1:
The patent introduces intermediate layers (first stack with first refractive index, second stack with second refractive index) between the substrate and color filters. These intermediary layers have refractive indices that gradually transition between the substrate and the color filters, reducing the reflectance of external light incident on the display device without requiring complex structural modifications.
Solution Approach 2:
The patent applies parameter changes by carefully selecting and controlling the refractive indices of the intermediate stacks. The first stack has a refractive index between that of the substrate and the color filters, while the second stack has a higher refractive index than the first stack. This parameter optimization enables effective reduction of external light reflectance while maintaining structural simplicity.
2Object-affected harmful factors
If multiple stacks with different refractive indices are introduced, then external light reflectance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that the first stack has a refractive index between that of the substrate and the color filters, and the second stack has a refractive index higher than the first stack. These parameter ranges provide manufacturing flexibility while achieving the desired anti-reflective effect, balancing performance improvement with manufacturing feasibility.
Solution Approach 2:
The patent employs composite material structures where the intermediate stacks are formed using materials with specific refractive index properties. By combining materials to achieve the desired refractive index ranges, the patent reduces reliance on extremely precise single-material properties, thereby lowering manufacturing precision requirements.
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 reflectance, enhancing display quality by improving color conversion and light management.
Implementation Method 1
a refractive index of the first stack has a value between a refractive index of the substrate and a refractive index of the first color filter, and the refractive index of the first stack is smaller than a refractive index of the second stack
Implementation Method 2
a first stack disposed on the substrate and overlapping the first light transmitting area, the second light transmitting area, and the third light transmitting area
Data Source
AI summary
A color converting substrate includes a substrate in which a first light transmitting area, a second light transmitting area, and a third light transmitting area are defined; a first stack disposed on the substrate and overlapping the first light transmitting area, the second light transmitting area, and the third light transmitting area; a first color filter disposed on the first stack and overlapping the first light transmitting area; a second color filter overlapping the second light transmitting area; a third color filter overlapping the third light transmitting area; and a second stack disposed between the first stack and at least one of the second color filter and the third color filter.