Photoelectric Sensor with Photodeformable Unit for Fingerprint Detection
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Solution Overview
Problem
Current photoelectric sensors lack an efficient mechanism to convert light signals into electrical signals effectively, particularly in applications requiring deformation-based energy conversion and precise pattern detection, such as fingerprint identification.
Innovation Solution
A photoelectric sensor comprising a photodeformable unit made of cross-linked liquid crystal macromolecules and a piezoelectric unit, where the photodeformable unit deforms in response to light, generating pressure on the piezoelectric unit to produce electrical signals, integrated into a display panel with a cavity structure to accommodate deformation without damaging other components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a photodeformable unit is used to convert light signals to mechanical deformation, then the conversion efficiency is improved, but the mechanical stability deteriorates due to repeated deformation
Solution Approach 1:
The photoelectric sensor is divided into two separate functional units: a photodeformable unit for light-to-mechanical conversion and a piezoelectric unit for mechanical-to-electrical conversion. This segmentation allows each unit to specialize in its optimal function while the piezoelectric unit provides stable electrical output without undergoing repeated deformation itself.
Solution Approach 2:
The piezoelectric unit acts as an intermediary between the photodeformable unit and the electrical circuit. It receives mechanical deformation from the photodeformable unit and converts it to electrical signals, thereby protecting the photodeformable unit from direct electrical contact while maintaining signal transmission.
2Device complexity
If the photodeformable unit is integrated directly into the display panel, then the device complexity is reduced, but the risk of panel damage increases due to deformation
Solution Approach 1:
A cavity structure is created in the display panel before integrating the photoelectric sensor, providing sufficient deformation space for the photodeformable unit. This preemptive design prevents the deformation unit from damaging other panel components during operation.
Solution Approach 2:
The photodeformable unit and piezoelectric unit are nested within a cavity structure that is embedded in the display panel. This nested arrangement allows the deformation units to operate within a dedicated space while maintaining overall panel integrity.
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
Enables effective conversion of light signals into electrical signals for applications like fingerprint detection, providing a contactless and remote interaction capability with improved mechanical stability and reduced risk of panel damage.
Implementation Method 1
A photoelectric sensor mainly uses photoelectric effect to convert optical signal to electric signal
Implementation Method 2
a piezoelectric unit in contact with the photodeformable unit... causes the piezoelectric unit to generate electrical signal(s)
Data Source
AI summary
Disclosed herein is a photoelectric sensor, display panel and their manufacturing method. The photoelectric sensor may comprise a photodeformable unit and a piezoelectric unit in contact with the photodeformable unit.