Biometric Sensor Light Receiving Unit Asymmetry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electronic devices face challenges in reducing the size of biometric sensors while maintaining performance and increasing yield efficiency.
Innovation Solution
Incorporating a biometric sensor positioned to overlap a display with an optical member, including a light condenser, and a polarization layer, where the light receiving unit's length aligns with the polarization axis, allowing for efficient light reception and image correction to achieve uniform image magnification across all regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the biometric sensor size is reduced, then the device compactness is improved, but the sensor performance and yield efficiency deteriorate
Solution Approach 1:
The light receiving unit is designed with an asymmetric rectangular shape where the length in the first direction (polarization axis direction) is greater than the length in the second direction. This asymmetric configuration optimizes light reception efficiency while maintaining a compact overall sensor size, resolving the contradiction between size reduction and performance maintenance.
Solution Approach 2:
The patent applies different structural characteristics to different regions of the light receiving unit. The asymmetric dimensions are specifically configured to match the polarization characteristics of the display layer, creating optimal light reception conditions in the polarization axis direction while maintaining compactness in the perpendicular direction.
2Measurement precision
If the light receiving unit length in the polarization axis direction is increased, then the light reception efficiency is improved, but the sensor area increases
Solution Approach 1:
The light receiving unit employs asymmetric dimensions with the length in the polarization axis direction being greater than in the perpendicular direction. This allows maximum light reception efficiency in the critical polarization direction while minimizing the overall area by keeping the perpendicular dimension smaller.
Solution Approach 2:
The patent optimizes the specific dimensional parameters of the light receiving unit by configuring the length ratio between the first and second directions. This parameter optimization achieves high light reception efficiency without requiring a large overall sensor area.
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 enables the reduction of biometric sensor size without degrading performance and enhances yield efficiency by optimizing light reception and image processing.
Implementation Method 1
a display including a polarization layer
Implementation Method 2
an optical member comprising a light condenser positioned between the display and the biometric sensor
Implementation Method 3
a light receiving unit including light receiving circuitry configured to receive light that is emitted from the display and is reflected by an external object
Data Source
AI summary
According to an embodiment, an electronic device may include: a display including a polarization layer, a biometric sensor positioned to at least partially overlap the display, and an optical member including a light condenser positioned between the display and the biometric sensor. The biometric sensor may include a light receiving unit comprising light receiving circuitry configured to receive light emitted from the display and reflected by an external object. A length of the light receiving unit in a first direction, which is a polarization axis direction of the polarization layer, is greater than a length of the light receiving unit in a second direction crossing the first direction.