Quarter-Wave Plate Hides Fingerprint Sensor in Full-Screen Display
Solution Overview
Problem
Integrating optical sensing components, such as fingerprint sensors, into full-screen electronic devices is challenging due to light interference and visibility issues, which affect accuracy and aesthetics.
Innovation Solution
Incorporating a quarter-wave plate between the sensing component and a polarization film, allowing the sensing component to be disposed in the display area without being visible, achieved by rotating the polarized state of light and blocking it with the polarization film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the sensing component is disposed in the display area to achieve full-screen display, then the display area is increased, but the sensing component becomes visible and prevents the display from radiating good taste
Solution Approach 1:
A quarter-wave plate is introduced as an intermediary component between the sensing component and the polarization film. This quarter-wave plate rotates the polarization state of light reflected from the sensing component by 90 degrees, enabling the polarization film to block the reflected light and hide the sensing component while maintaining full-screen display functionality
2Area of stationary object
If the sensing component is disposed in the display area, then the full-screen display is achieved, but light interference occurs to the detriment of the accuracy of the embedded sensing component
Solution Approach 1:
The quarter-wave plate serves as an optical intermediary that transforms the polarization state of reflected light, enabling selective blocking by the polarization film. This reduces unwanted light interference reaching the sensing component while maintaining display functionality, thereby improving sensing accuracy
3Ease of manufacture
If a quarter-wave plate and polarization film are added to hide the sensing component, then the aesthetics is improved, but the device complexity increases
Solution Approach 1:
The quarter-wave plate and polarization film are integrated into the existing display structure, merging the hiding function with the display layers. This approach achieves aesthetic improvement while minimizing additional structural complexity by utilizing the existing optical path of the display
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 full-screen display while maintaining the functionality and aesthetics of the electronic device by hiding the sensing component, thus enhancing user experience.
Implementation Method 1
a quarter-wave plate disposed between the sensing component and the polarization film
Data Source
AI summary
Provided is an electronic device including: a sensing component; a polarization film disposed on the sensing component; and a quarter-wave plate disposed between the sensing component and the polarization film.