Beam-Modified Glass Cover Window Etching for Flexible Displays
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Solution Overview
Problem
Flexible display devices face a trade-off between impact resistance and flexibility, with thin glass cover windows enhancing flexibility but compromising impact resistance, and existing manufacturing methods struggle to achieve uniform stress distribution and minimize visible boundaries between different thickness areas.
Innovation Solution
A method involving pre-processing with laser or halogen beams to modify the bendable area of a glass substrate, followed by etching to create a groove with a Gaussian distribution, ensuring the bendable area is thinner than flat areas, and chemical strengthening to improve impact resistance and flexibility, while maintaining a seamless visual transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cover window is made thin to enhance flexibility, then the flexible characteristic is improved, but the impact resistance is deteriorated
Solution Approach 1:
The patent applies local quality by creating different thickness regions in the glass cover window: a first region with thickness of 30-50 μm in the bending area for flexibility, and a second region with thickness of 70-100 μm in the non-bending area for impact resistance. This spatial differentiation of thickness allows each region to optimize its mechanical properties for its specific functional requirement.
Solution Approach 2:
The glass cover window is segmented into distinct thickness zones through selective etching. The bending area is divided from the non-bending area, with each zone having tailored thickness characteristics. This segmentation enables the cover window to simultaneously achieve flexibility where needed and strength where required, resolving the contradiction between these opposing requirements.
2Adaptability or versatility
If the cover window is made thin to enhance flexibility, then the flexible characteristic is improved, but the visible boundary between different thickness areas becomes more noticeable
Solution Approach 1:
The patent applies preliminary action through pre-processing the glass surface in the bending area using laser irradiation or chemical treatment before etching. This pre-processing modifies the glass structure to enable more precise and uniform etching, resulting in smoother thickness transitions and reduced visible boundaries between different thickness regions.
Solution Approach 2:
The patent utilizes parameter changes by controlling etching conditions (temperature, etchant concentration, irradiation intensity) to achieve gradual thickness transitions. By carefully adjusting these parameters, the etching process creates smooth gradients between thick and thin regions, minimizing abrupt boundaries and improving visual uniformity.
3Adaptability or versatility
If the bendable area is etched faster to reduce thickness, then the flexibility is improved, but the uniformity of etching and stress distribution is compromised
Solution Approach 1:
The patent applies local quality by implementing selective etching where only the bending area is treated with enhanced etching conditions (laser irradiation or chemical pre-processing). This creates localized modification that accelerates etching in the bending region while maintaining uniform etching in non-bending areas, ensuring both flexibility and overall etching uniformity.
Solution Approach 2:
The patent uses laser irradiation or chemical pre-processing as an intermediary step before etching. This intermediary treatment modifies the glass structure in the bending area to facilitate more uniform and controlled etching, acting as a mediator that enables both fast removal of material and uniformity in the final thickness distribution.
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 method enhances the impact resistance and flexibility of the cover window, improves manufacturing yield, and ensures uniform stress distribution, minimizing visible boundaries and reducing the risk of damage to the display device.
Implementation Method 1
modifying the bendable area by irradiating the glass substrate with a beam... The beam may be a laser beam... The etching of the bendable area may also include heating the bendable area to be a higher temperature than the flat area
Implementation Method 2
In the heating, a temperature applied to the bendable area may have a Gaussian distribution with respect to a center line of the bendable area
Implementation Method 3
In the modifying of the bendable area, a modification depth of the glass substrate may decrease from a center of the bendable area toward a boundary between the bendable area and the flat area... the bendable area may be etched faster than the flat area in the etching task due to the task of modifying the bendable area
Data Source
AI summary
A method of manufacturing a cover window for a display device includes: providing a glass substrate having a bendable area and a flat area; modifying the bendable area by irradiating the glass substrate with a beam; and etching the bendable area to have a thinner thickness than the flat area. The bendable area may have a faster etch rate than the flat area due to the modifying of the bendable area.