Optical Module Air Gap for Thin Fingerprint Sensor
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Solution Overview
Problem
Conventional optical fingerprint identification modules in mobile terminals are thick, which hinders miniaturization and lightening, and require complex structures that compromise identification precision.
Innovation Solution
An optical module with a lens and sensor package that includes an air gap to reduce thickness while maintaining identification accuracy, where the photosensitive region of the optical sensor receives light through the air gap, allowing for thinner designs without compromising detection precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical fingerprint identification apparatus is arranged below the screen with higher identification precision, then the identification accuracy is improved, but the thickness of the apparatus increases
Solution Approach 1:
The patent repositions the optical module from a vertical stacking arrangement below the screen to a lateral integration along the side edge of the terminal. This dimensional change allows the optical module to share the side space with the battery, eliminating vertical overlap and reducing the thickness requirement while maintaining identification accuracy through optimized optical path design
2Area of stationary object
If the optical module components are superimposed over the battery, then the screen coverage is improved, but the device complexity and packaging structure complexity increase
Solution Approach 1:
The patent segments the terminal internal space into distinct functional zones: the optical module is positioned along the side edge in a lateral arrangement, while the battery occupies the lower portion. This segmentation eliminates the need for complex superimposed packaging structures, simplifying the overall device architecture while maintaining adequate screen coverage through optimized component layout
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 optical module achieves higher identification accuracy with reduced thickness, balancing precision and miniaturization by minimizing light interference and moire effects, enabling thinner mobile terminal designs without sacrificing fingerprint detection performance.
Implementation Method 1
The lens is positioned at an uppermost position of the optical module and attached to a lower position of a terminal screen, and is configured to transmit light passing through the screen
Implementation Method 2
an air gap is defined between the lens and the sensor package, and the photosensitive region of the optical sensor is configured to receive light passing through the screen via the air gap
Implementation Method 3
a photosensitive region is arranged on an upper surface of the optical sensor, and the photosensitive region is configured to receive light passing through the lens
Data Source
AI summary
Embodiments of the present application, pertaining to the technical field of optical devices, provide an optical module and a fabrication method thereof, and a terminal device using the same. The optical module includes a lens and a sensor package. The lens is positioned at an uppermost position of the optical module and attached to a lower position of a terminal screen, and is configured to transmit light passing through the screen; the sensor package includes an optical sensor, where a photosensitive region is arranged on an upper surface of the optical sensor, and the photosensitive region is configured to receive light passing through the lens; and the sensor package further includes an air gap, and the photosensitive region of the optical sensor is configured to receive the light passing through the screen via the air gap.