Display Window Crystal Zoning for Low-Glare Durability
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Solution Overview
Problem
Existing display devices face challenges in achieving both increased durability and reduced reflectivity of external light to enhance display quality.
Innovation Solution
A glass substrate with alternating first and second portions, where the second portions have a higher crystal content and include depressed patterns to scatter external light, reducing reflectivity while maintaining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crystal content of the glass substrate is increased to enhance durability and strength, then the strength and impact resistance are improved, but the reflectivity of external light increases which deteriorates display quality
Solution Approach 1:
The glass substrate is divided into multiple regions with different crystal contents: a first region with lower crystal content (amorphous glass) for high light transmittance and a second region with higher crystal content (crystalline glass-ceramic) for high strength. This spatial segmentation allows each region to optimize for its specific function, resolving the contradiction between strength and reflectivity.
Solution Approach 2:
Different regions of the glass substrate are assigned different material properties: the first region has low crystal content (0-30%) to minimize light reflection and maximize transmittance for display quality, while the second region has high crystal content (70-90%) to maximize strength and impact resistance for durability. This local differentiation of material quality resolves the global contradiction.
2Reliability
If the crystal content is increased to improve durability, then the impact resistance is enhanced, but the light transmittance decreases which affects display quality
Solution Approach 1:
The substrate is segmented into functional zones: the first region with low crystal content (amorphous glass) is optimized for optical performance (high light transmittance), while the second region with high crystal content (crystalline glass-ceramic) is optimized for mechanical performance (high durability). This segmentation allows both requirements to be satisfied simultaneously in their respective zones.
Solution Approach 2:
The glass substrate exhibits local quality variations where different regions have different crystal contents tailored to their specific functional requirements. The first region maintains high light transmittance for display quality, while the second region achieves high durability for impact resistance, resolving the contradiction between these opposing requirements.
3Ease of manufacture
If a uniform glass composition is used to simplify manufacturing, then the ease of manufacture is improved, but the ability to simultaneously achieve high strength and high transmittance deteriorates
Solution Approach 1:
The glass substrate is prepared with pre-formed regions of different crystal contents through controlled crystallization treatment before final processing. The first region is formed with low crystal content (amorphous glass) and the second region with high crystal content (crystalline glass-ceramic) through preliminary thermal treatment, enabling subsequent easy formation of the multi-region structure without complex manufacturing steps.
Solution Approach 2:
The crystal content parameter is varied across different regions of the glass substrate by controlling the crystallization temperature and duration during manufacturing. This parameter change enables the formation of distinct regions with different properties (amorphous vs. crystalline) from a single glass composition, achieving both ease of manufacture and superior performance.
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 provides a window with enhanced durability and reduced external light reflectivity, improving display quality by minimizing glare and enhancing visibility.
Implementation Method 1
At least a portion of natural light incident on the first portion or the second portion may be Mie-scattered at the first portion or the second portion
Data Source
AI summary
A window includes a glass substrate having a plurality of first portions and a plurality of second portions. The plurality of first and second portions are alternately arranged with each other along a first direction. An upper surface of each of the plurality of first portions includes a first depressed pattern of a plurality of first depressed patterns defined therein. A first length in the first direction of each of the plurality of first depressed patterns is in a range of about 20 nm to about 2000 nm. A crystal content of each of the plurality of second portions is greater than a crystal content of each of the plurality of first portions.