Dual-Lens Touchscreen Protection with Sensor Detection
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Solution Overview
Problem
Portable communication devices, such as smartphones, are prone to lens cracking when dropped, leading to costly repairs and reduced touchscreen sensitivity due to existing lens protection methods, which either obscure the display or cause functional issues.
Innovation Solution
Implementing two separate glass lenses, where the first is laminated to the display and the second is laminated to the first, with the second lens being removable to maintain device functionality and adjust touchscreen sensitivity based on its presence or absence, detected by sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a glass lens cover is used to protect the display, then the lens resistance to cracking is improved, but the touchscreen sensitivity deteriorates due to increased distance between finger and touch sensor
Solution Approach 1:
The protective lens system is divided into two separate glass lenses: a first glass lens laminated to the display and a second glass lens laminated to the first lens. This segmentation allows the second lens to be made thinner while maintaining protective function, thereby improving touchscreen sensitivity without sacrificing crack resistance.
2Strength
If a plastic lens cover is used to protect the display, then the lens protection is improved, but the display clarity deteriorates due to obscuration
Solution Approach 1:
The solution uses a composite structure combining two glass lenses instead of a single plastic lens. This composite glass configuration provides both the protective strength needed and the optical clarity required, eliminating the trade-off present with plastic covers.
3Strength
If a glass lens liner is used to protect the display, then the lens protection is improved, but the touchscreen sensitivity deteriorates and the liner scratches easily
Solution Approach 1:
By segmenting the protective function into two separate glass lenses, the system eliminates the need for a thick single lens or a scratch-prone liner. The second glass lens can be optimized for protection while maintaining thinness for sensitivity, and the lamination structure protects against scratching.
4Ease of manufacture
If the second glass lens is made thicker for manufacturability, then the ease of manufacture is improved, but the touchscreen sensitivity deteriorates
Solution Approach 1:
The protective function is segmented into two lenses, allowing the second lens to be made thinner than a single protective lens would need to be. This segmentation enables the second lens to be thin enough for good touchscreen sensitivity while still providing protection when combined with the first lens.
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 solution allows for a functional device with either lens configuration, maintaining touchscreen sensitivity and user experience while enabling easy replacement of the secondary lens to prevent damage.
Implementation Method 1
the first lens includes an optical transmission area in the same region that the second lens includes solid artwork to block light. In this way, the sensor is blocked when the second lens is assembled to the device
Data Source
AI summary
A display protection system for use in a portable electronic device includes first and second lenses overlaying the device display. The first lens includes an aperture over a lens sensor mounted in the device, whereas the second lens includes an opaque region in that same area. In this way, the lens sensor may detect the presence or absence of the secondary lens and adjust touch sensor behavior accordingly.