Embedded Light Sensor in Wearable Display Laminate
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Solution Overview
Problem
Wearable devices face challenges in incorporating ambient light sensors without increasing bulk or compromising aesthetics, as existing solutions often position light sensors to detect ambient light around or beside the device rather than on the display screen, affecting display brightness adjustment and power consumption.
Innovation Solution
An embedded light sensing component is positioned within a laminate stack between the display component and the lens structure of a wearable device, allowing it to accurately detect ambient light on the display screen without adding thickness, using a two-part poly carbonate lens structure with cutouts for the light sensor, and a touch sensor with embedded cutouts to maintain device thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light sensor is positioned to detect ambient light around or beside the device, then the device can detect ambient light, but the display brightness adjustment is affected and power consumption increases
Solution Approach 1:
The light sensor is repositioned from a lateral position (beside the display) to a position above the display surface, detecting light from a different spatial dimension. This allows the sensor to measure ambient light levels without being influenced by light reflected from or passing through the display screen, thereby improving measurement precision while enabling more accurate display brightness adjustment that reduces power consumption.
2Adaptability or versatility
If a light sensor is integrated into the wearable device, then ambient light detection is enabled, but the device bulk and thickness increase
Solution Approach 1:
The light sensor is nested within the existing laminate stack structure of the wearable device, specifically positioned between the display component and the lens structure. By integrating the sensor into the existing layered architecture rather than adding it as a separate external component, the device gains ambient light sensing capability without increasing overall bulk or thickness.
Solution Approach 2:
Instead of adding thickness in the Z-direction by placing the sensor behind the display, the design positions the sensor above the display surface in the existing laminate stack. This utilizes the available space in the upper dimension, allowing the sensor to be embedded within the lens assembly structure without increasing the device's overall profile thickness.
3Measurement precision
If a light sensor is positioned on the display screen, then accurate ambient light detection is achieved, but the display aesthetics and thinness are compromised
Solution Approach 1:
The light sensor is embedded within the lens structure and laminate stack, nesting it within the existing aesthetic components of the device. The sensor is positioned in a cutout or recess within the lens assembly, allowing it to detect ambient light accurately while remaining visually integrated into the device's thin profile, thus preserving both measurement precision and aesthetic appearance.
Solution Approach 2:
The light sensor is positioned at a specific localized area above the display where it can accurately detect ambient light without interfering with the display's visual appearance. This localized positioning allows the sensor to perform its function while the surrounding lens structure and laminate stack maintain the device's thin, aesthetically pleasing profile.
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 enables accurate ambient light detection on the display screen, allowing for adjustable display brightness and power conservation while maintaining the aesthetic appeal and thinness of wearable devices.
Implementation Method 1
a light sensor positioned to sense ambient light that is detectable on a display screen
Data Source
AI summary
In embodiments of an embedded light sensing component, a lens assembly includes a display component to display a user interface, such as when implemented in a wearable device. The lens assembly has a lens structure that covers the display component. The lens assembly also includes a light sensor that is implemented to sense ambient light in an environment proximate the lens structure, where the light sensor is embedded between the display component and the lens structure of the lens assembly.