Optical Sensor Layout for Fingerprint and Luminance Sensing
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Solution Overview
Problem
There is a need to enhance the design of optical sensors in electronic devices to improve their functionality, particularly in detecting light for fingerprint authentication and luminance calibration, while maintaining device efficiency and size.
Innovation Solution
An electronic device is designed with a substrate, a light emitting diode, and an optical sensor where the optical sensor has distinct regions to receive light emitted by the diode and reflected light from objects, generating electrical signals for fingerprint authentication and luminance calibration, respectively, allowing for multi-functional operation with reduced size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate optical sensors are used for fingerprint authentication and luminance calibration, then detection accuracy is improved, but device size and complexity increase
Solution Approach 1:
The optical sensor is designed to perform multiple functions: fingerprint authentication and luminance calibration. The sensor can operate in different modes by controlling the light emitting diode - in fingerprint mode, the LED emits light toward the substrate to illuminate the finger, while in luminance calibration mode, the LED emits light directly toward the sensor to measure display brightness. This multi-functionality eliminates the need for separate sensors, reducing device size and complexity while maintaining detection accuracy for both functions
Solution Approach 2:
The optical sensor's functionality is made dynamic through software control of the light emitting diode. The system can switch between fingerprint authentication mode and luminance calibration mode by controlling when and how the LED emits light. This dynamic operation allows a single sensor to adapt to different measurement requirements, resolving the contradiction between having specialized sensors for each function and maintaining a compact device design
2Adaptability or versatility
If the optical sensor receives both reflected light for fingerprint detection and direct light for luminance calibration, then multi-functional operation is achieved, but signal interference may occur
Solution Approach 1:
The system uses periodic action by controlling the light emitting diode to emit light in specific time sequences corresponding to different operational modes. During fingerprint authentication, the LED emits light in a first time sequence to illuminate the finger for reflected light detection. During luminance calibration, the LED emits light in a second time sequence to provide direct light for sensor measurement. This temporal separation of light emission prevents signal interference while enabling multi-functional operation
Solution Approach 2:
The optical sensor provides feedback by generating electrical signals that are processed to determine both fingerprint information and luminance data. The system uses the electrical signals from the sensor to control the light emitting diode's operation, creating a feedback loop that optimizes light emission timing and intensity for each function. This feedback mechanism ensures that the sensor receives appropriate light signals for each mode while minimizing interference between functions
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 effective fingerprint authentication and luminance calibration, while minimizing the device's size by integrating multiple functions into the optical sensor, thus addressing the demand for improved optical sensor design in electronic devices.
Implementation Method 1
a light emitting diode disposed on the substrate and emitting a light
Implementation Method 2
the optical sensor receives the light to generate a first electrical signal for fingerprint authentication and receives the light to generate a second electrical signal for luminance calibration
Data Source
AI summary
An electronic device includes a substrate, a light emitting diode and an optical sensor. The light emitting diode is disposed on the substrate and emits a light. The optical sensor is disposed on the substrate and is configured to receive the light. The optical sensor receives the light to generate a first electrical signal for fingerprint authentication, and receives the light to generate a second electrical signal for luminance calibration of the light.