Scattering Member for Illuminance Sensor FOV
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Solution Overview
Problem
Electronic devices face challenges in accurately measuring illuminance due to reduced bezel size, leading to narrower field-of-view (FOV) and deviations in light measurement, resulting in uncomfortable screen brightness and inaccurate illuminance readings.
Innovation Solution
Incorporating a transparent member with a scattering member and a light receiving element to scatter incident light at a designated angle, allowing the light receiving element to obtain scattered light and determine brightness, while a control circuit adjusts display brightness based on the scattered light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the bezel size is reduced to favor smaller device dimensions, then the device size is reduced, but the field-of-view (FOV) narrows and illuminance measurement accuracy deteriorates
Solution Approach 1:
A scattering member is introduced as an intermediary between the light receiving element and the external light source. This scattering member diffuses incident light before it reaches the light receiving element, enabling accurate illuminance measurement even when the opening size is reduced due to smaller bezel dimensions.
Solution Approach 2:
The optical properties of the light path are modified by introducing a scattering member that changes the direction and distribution of incident light. This parameter change in light propagation allows the light receiving element to capture sufficient light for accurate measurement despite the reduced FOV caused by smaller bezel size.
2Area of stationary object
If the opening size is reduced due to smaller bezel, then the device structure is more compact, but the field-of-view (FOV) narrows and light measurement deviation increases
Solution Approach 1:
The scattering member serves as a mediator that compensates for the reduced opening size. By scattering incident light across a wider angular range, it allows the light receiving element to maintain reliable measurement capability even with a smaller opening area.
Solution Approach 2:
The scattering member transforms the light path from a direct linear path to a multi-directional path, effectively utilizing angular dimension to compensate for the reduced opening area. This dimensional change in light propagation restores the field-of-view functionality despite the smaller physical opening.
3Device complexity
If the light receiving element is positioned closer to the opening, then the device structure is simplified, but the field-of-view (FOV) narrows and measurement accuracy decreases
Solution Approach 1:
The scattering member is positioned between the opening and the light receiving element, acting as a mediator that expands the effective field-of-view. This allows the light receiving element to be positioned closer to the opening while maintaining measurement precision, as the scattering member compensates for the reduced distance by diffusing light from a wider angular range.
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 ensures accurate illuminance measurement and proper screen brightness, even with reduced bezel size, by enhancing the field-of-view and reducing deviations in light measurement, thus providing a comfortable user experience and precise illuminance accuracy.
Implementation Method 1
a scattering member disposed under a portion of the transparent member to scatter light incident at a designated angle from an outside of the electronic device through the transparent member
Data Source
AI summary
Various embodiments of the disclosure relate to a proximity-illuminance sensor and an electronic device including the same to increase the accuracy of the illuminance sensor and addressing crosstalk issues. According to an embodiment, an electronic device comprises a transparent member, a scattering member disposed under a portion of the transparent member to scatter light incident at a designated angle from an outside of the electronic device through the transparent member, a light receiving element disposed under the portion and configured to obtain scattered light which is scattered by the scattering member from at least a part of incident light, and a control circuit configured to determine a brightness of the incident light based on, at least, the scattered light obtained through the light receiving element. The electronic device may be implemented in various manners according to embodiments of the disclosure.