Infrared Blocking Member for Optical Fingerprint Sensor
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Solution Overview
Problem
Fingerprint recognition failures occur in display devices due to infrared light interference from external sources, leading to increased false recognition and non-recognition rates in optical fingerprint sensors.
Innovation Solution
Incorporating an infrared blocking member between the optical sensor and the cover window, which blocks infrared light with wavelengths ranging from 780 nm to 2500 nm, preventing it from entering the sensor and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an optical sensor is disposed under the display panel for fingerprint recognition, then the device integration is improved and display area is increased, but infrared light from external sources interferes with the sensor causing recognition failures
Solution Approach 1:
An infrared blocking member is introduced as an intermediary component between the cover window and the optical sensor. This member selectively blocks infrared light wavelengths (780nm-2500nm) from reaching the sensor while allowing visible light to pass through, thereby eliminating external infrared interference without affecting the fingerprint recognition function
Solution Approach 2:
The infrared blocking member is positioned specifically at the location where infrared light interference occurs (between the cover window and optical sensor), providing localized infrared filtration only where needed. This allows the rest of the display system to maintain its original optical properties without modification
2Reliability
If an infrared blocking member is added to block external infrared light, then fingerprint recognition accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The infrared blocking member is integrated with existing display components such as the polarizing film or adhesive layers. By combining multiple functions (polarization, adhesion, and infrared blocking) into a single composite layer, the number of separate components is reduced and manufacturing complexity is minimized
Solution Approach 2:
The infrared blocking member is designed to perform multiple functions simultaneously: it blocks infrared light, maintains optical transparency for visible light, and can serve as part of the structural assembly or adhesive system. This multi-functionality reduces the need for additional dedicated components
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 solution effectively reduces fingerprint recognition failures by minimizing infrared light interference, thereby enhancing the accuracy and reliability of fingerprint recognition in display devices.
Implementation Method 1
an infrared blocking member disposed between the optical sensor and the cover window, wherein at least a part of the infrared blocking member overlaps the optical sensor from above the optical sensor
Data Source
AI summary
Systems and methods are described for a display device in which the recognition failure of a fingerprint recognition sensor disposed in a display area without being exposed to the outside is reduced. The display device comprises a display panel; a cover window disposed above the display panel; an optical sensor, wherein at least a part of the optical sensor is disposed under the display panel; and an infrared blocking member disposed between the optical sensor and the cover window and at least a part of which overlaps the optical sensor from above the optical sensor.