Front Cover Masking for Optical Sensor Protection and Touch Detection
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Solution Overview
Problem
Modern handheld electronic devices, such as smartphones, face challenges in integrating various subsystems like touch-sensitive displays, wireless communications, cameras, and optical sensors into a compact and reliable form that can withstand daily use.
Innovation Solution
A portable electronic device design that includes a housing component and a front cover defining a display region and a front-facing sensor region. The device features a touch-sensing component with optical sensors and a light emitter, and an opaque mask positioned on a polymer coating layer to enhance touch input detection and optical functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple subsystems (touch-sensitive display, wireless communications, cameras, optical sensors) are integrated into a compact device, then device functionality and versatility are improved, but device complexity and difficulty of integration increase
Solution Approach 1:
The patent combines multiple subsystems including touch-sensitive display, optical sensors, light emitter, and wireless communication components into a single integrated handheld device structure. The front cover integrates both display functionality and sensor access, merging what could be separate components into a unified design that reduces overall system complexity while maintaining full functionality.
Solution Approach 2:
The front cover serves multiple functions simultaneously: it acts as a protective barrier, provides structural support for the display, enables touch input detection, and allows optical sensor access through defined regions. This multi-functionality reduces the need for separate components and simplifies the overall device architecture.
2Reliability
If optical sensors and light emitter are positioned below the front cover, then device durability and protection are improved, but touch input detection accuracy may worsen
Solution Approach 1:
The front cover is designed with differentiated regions: opaque regions that protect optical sensors and translucent or transparent regions that allow touch input detection. This local variation in optical properties ensures that protection is provided where needed while maintaining touch sensitivity in interaction areas, resolving the conflict between durability and detection accuracy.
Solution Approach 2:
The front cover acts as an intermediary element between the external environment and the optical sensors. It selectively transmits or blocks light based on the underlying component, allowing touch detection in some areas while protecting sensors in others, thus mediating between protection requirements and detection needs.
3Reliability
If opaque mask is positioned on polymer coating layer, then optical sensor protection and touch detection are improved, but manufacturing complexity increases
Solution Approach 1:
The opaque mask is positioned on the polymer coating layer during the manufacturing process, before final device assembly. This preliminary positioning allows for integrated processing of multiple layers in a single manufacturing sequence, reducing overall manufacturing complexity despite the additional component.
Solution Approach 2:
The device employs a composite structure with multiple layers including polymer coating and opaque mask materials. This composite approach allows each layer to perform its specific function (protection, optical blocking, touch detection) while being integrated into a single manufacturable structure through coordinated processing.
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 enables a compact and reliable handheld device that effectively detects touch inputs and utilizes optical sensors for various functionalities, improving the device's durability and user interaction experience.
Implementation Method 1
a light emitter positioned below the front cover and below the first hole and configured to emit light onto an object, and the first optical sensor may be configured to receive a portion of the emitted light reflected from the object
Implementation Method 2
a touch-sensing component configured to detect a first touch input applied to the front cover in the active display region of the display and a second touch input applied to the front cover over the first hole in the display
Data Source
AI summary
A mobile phone may include an enclosure defining an internal volume, the enclosure including a front cover formed from a transparent material and defining a front exterior surface, a rear cover formed from a glass material and defining a rear exterior surface, and a housing component defining a side exterior surface. The mobile phone may include a circuit board assembly within the internal volume. The circuit board assembly may include a circuit board, a circuit component coupled to an exterior surface of the circuit board, and a cowling coupled to the circuit board and covering the circuit component, the cowling having a thickness less than about 0.5 mm and including a base structure formed from an aluminum alloy having a thickness less than about 0.4 mm and a thermally conductive structure positioned over the base structure and configured to dissipate heat.