Image Capturing Module Trenches for Optical Interference Reduction
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Solution Overview
Problem
Optical biometric feature identification apparatuses, such as fingerprint scanners, face interference issues due to light beams emitted at greater angles directly reaching the sensor, affecting identification capability.
Innovation Solution
An image capturing module with a transparent colloid curing layer featuring trenches between the sensor and light emitting devices, which redirects light beams and reduces optical interference, enhancing identification accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light emitting devices are disposed beside the sensor, then the device structure is simplified and easier to manufacture, but light beams emitted at greater angles directly reach the sensor causing optical interference
Solution Approach 1:
A light shielding layer is introduced as an intermediary component between the light emitting devices and the sensor. This shielding layer selectively blocks light beams emitted at greater angles from reaching the sensor directly, while allowing light beams that have reflected off the light guide (carrying fingerprint information) to pass through to the sensor.
Solution Approach 2:
The light shielding layer is segmented into multiple regions corresponding to different light emitting devices. Each segment is positioned to shield specific angular ranges of light from reaching the sensor, allowing precise control over which light beams are blocked and which are allowed to reach the sensor.
2Area of stationary object
If light beams are emitted at greater angles, then the light coverage area increases, but direct emission to the sensor causes optical interference affecting identification capability
Solution Approach 1:
The light shielding layer acts as a mediator that allows wide-angle light emission for comprehensive coverage while selectively blocking the harmful direct beams. The shielding layer's positioning and geometry are designed to permit light beams covering the entire fingerprint area to reach the sensor through the light guide, while blocking direct beams that would cause interference.
Solution Approach 2:
Different regions of the light shielding layer have different shielding properties. The shielding layer is designed with varying thickness or material properties in different areas to selectively block light beams from specific angles while allowing light beams from other angles to pass through, thereby maintaining comprehensive light coverage without optical interference.
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 module effectively minimizes optical interference, improving the identification capability by preventing direct light emission onto the sensor and facilitating better fingerprint pattern recognition.
Implementation Method 1
The at least one trench is located between the sensor and the light emitting devices... prevent the light beams emitted by the light emitting devices from being directly irradiated on the sensor
Data Source
AI summary
An image capturing module including a substrate, a plurality of light emitting devices, a sensor, and a transparent colloid curing layer is provided. The light emitting devices and the sensor are disposed on the substrate and are respectively electrically connected to the substrate. The transparent colloid curing layer is disposed on the substrate and covers the sensor and the light emitting devices. At least one trench is provided at a side of the transparent colloid curing layer opposite to the sensor. The at least one trench is located between the sensor and the light emitting devices, and a depth of the at least one trench is less than a thickness of the transparent colloid curing layer. An electrical apparatus is also provided.