Ambient Light Sensor Module with Antireflection Layers
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Solution Overview
Problem
Electronic devices with light sensors face challenges in effectively integrating ambient light sensors to accurately measure light conditions without compromising display quality or user experience, particularly in bright environments where stray light noise and visibility of internal components are concerns.
Innovation Solution
Incorporating an ambient light sensor module with a light attenuator and optical structures, such as antireflection layers and light diffuser structures, aligned with an opening in an opaque masking layer, which allows for accurate light measurement while maintaining a dark appearance and reducing stray light noise, thus enhancing user experience by adjusting display brightness based on ambient light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an opening is provided in the opaque masking layer to allow ambient light to reach the sensor, then the light sensor can accurately measure ambient light conditions, but the internal device components become visible from the exterior
Solution Approach 1:
The solution applies local quality by making the masking layer transparent specifically at the sensor opening location while maintaining opacity in surrounding areas. This allows light to reach the sensor through the transparent opening while the opaque surrounding masking layer continues to hide internal components from external view.
Solution Approach 2:
The masking layer acts as an intermediary element that selectively transmits light where needed (at the sensor opening) while blocking light in other areas. It mediates between the conflicting requirements of allowing light access for sensing and preventing visibility of internal components.
2Measurement precision
If the ambient light sensor module is positioned to receive light through the opening, then ambient light measurement is enabled, but stray light noise interferes with accurate measurement
Solution Approach 1:
The sensor module incorporates localized optical structures including antireflection coatings at specific surfaces and light-blocking structures in particular regions. These local modifications enable the sensor to selectively accept ambient light from desired directions while rejecting stray light from other directions, improving measurement accuracy.
Solution Approach 2:
The light-blocking structures within the sensor module convert potentially harmful stray light into beneficial directional selectivity. By strategically placing opaque structures, the design uses light blocking to define the acceptance angle and improve the signal-to-noise ratio for ambient light measurement.
3Measurement precision
If optical structures such as antireflection layers and light diffuser structures are added to the sensor module, then light measurement accuracy and appearance are improved, but device complexity increases
Solution Approach 1:
The patent merges multiple optical functions into a single integrated sensor module structure. The antireflection layers, light diffuser structures, light-blocking elements, and sensor components are combined into one compact assembly, reducing the need for separate components and simplifying integration into the display device.
Solution Approach 2:
The sensor module is designed with multi-functionality, where single components perform multiple roles. For example, the masking layer serves both as a cosmetic element and as a light management structure, while the antireflection layers simultaneously improve light transmission and reduce glare. This multi-functionality reduces overall device complexity.
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 precise ambient light measurement, reduces stray light noise, and provides a visually integrated appearance, enhancing user comfort by automatically adjusting display brightness and color cast according to environmental lighting conditions.
Implementation Method 1
one or more antireflection layers may be interposed between an inwardly facing surface of the display and an opposing external surface of the ambient light sensor module
Implementation Method 2
light diffuser structures, infrared-light-blocking structures, light guide structures, and/or other optical structures may be included in the ambient light sensor module
Implementation Method 3
The light attenuator may provide the ambient light sensor module with a dark appearance that matches surrounding portions of the opaque masking layer
Data Source
AI summary
An electronic device may have a display with an array of pixels configured to display images for a user. The electronic device may have an ambient light sensor for gathering ambient light information. Control circuitry in the electronic device may adjust the brightness level of an image being displayed by the display based on ambient light measurements from the ambient light sensor. The ambient light sensor may be formed from an ambient light sensor module that is aligned with an opening in an opaque masking layer in the display. One or more antireflection layers may be interposed between an inwardly facing surface of the display and an opposing external surface of the ambient light sensor module. The ambient light sensor module may have a light attenuator and other optical structures.