Opposite-Facing Sensor IC Layout for Accurate Ambient Light Sensing
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Solution Overview
Problem
Existing reality computing devices face challenges in accurately detecting ambient light and user proximity due to the inherent configuration of ambient light sensors and proximity sensors, which often require multiple packages and increased cost, and can result in inaccurate ambient light detection when sensors are not oriented correctly.
Innovation Solution
A sensor integrated circuit (IC) is designed with an ambient light sensor and a proximity sensor facing opposite directions, allowing for accurate detection of ambient light and user proximity without overlapping fields of view, thereby improving ergonomic integration and reducing costs by eliminating the need for multiple sensor packages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ambient light sensor and proximity sensor are integrated in the same package, then device complexity is reduced, but measurement precision deteriorates due to overlapping fields of view causing inaccurate ambient light detection
Solution Approach 1:
The patent applies asymmetry by orienting the ambient light sensor and proximity sensor in opposite directions rather than symmetrically. The ambient light sensor faces one direction to detect ambient light, while the proximity sensor faces the opposite direction to detect user proximity, preventing their fields of view from overlapping and eliminating interference between the two sensors
Solution Approach 2:
The patent resolves the contradiction by transitioning from a two-dimensional planar arrangement where both sensors face the same direction to a three-dimensional opposite-facing configuration. This dimensional change allows both sensors to be integrated in the same package while maintaining separate detection zones through opposite orientations
2Measurement precision
If ambient light sensor and proximity sensor are placed on opposite sides of the sensor IC, then measurement precision is improved by preventing field overlap, but device complexity increases due to multi-sided integration requirements
Solution Approach 1:
The sensor IC package serves multiple functions simultaneously: it houses both the ambient light sensor and the proximity sensor, provides structural support, and manages the complex opposite-facing integration. This multi-functional design consolidates what would otherwise require separate packages into a single universal component
Solution Approach 2:
The patent merges the ambient light sensor and proximity sensor into a single integrated package despite their opposite-facing orientations. This combining approach consolidates multiple sensor functions and structural elements into one unified component, reducing the overall number of separate parts needed in the device
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 configuration enhances the accuracy of ambient light detection and user proximity sensing, enabling more efficient control of display brightness and power modes in wearable devices, while reducing the complexity and cost of sensor integration.
Implementation Method 1
an ambient light sensor is used in a reality computing device to detect ambient light conditions
Implementation Method 2
a proximity sensor is integrated in a reality computing device to detect if the user is wearing the reality computing device
Data Source
AI summary
A sensor integrated circuit (IC) employing opposite facing ambient light sensor and proximity sensor, and related electronic devices and fabrication methods. As an example, the sensor IC can be integrated into an electronic device (e.g., a wearable device) to detect the proximity of a user and ambient light to control functions of the electronic device. To provide for the proximity sensor and the ambient light sensor to disposed in the sensor IC face outward in different (e.g., opposite) directions in a package to align towards a user and the user's experience of ambient light, the proximity sensor and the ambient light sensor are disposed on different sides of the sensor IC. In this manner, the ambient light sensor can be facing in the direction of ambient light perceived by a user of the electronic device, and the proximity sensor detect the user from a different side of the electronic device.