OLED Fingerprint Sensor Collimator for Scattered Light Blocking
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Solution Overview
Problem
Conventional fingerprint recognition devices in OLED displays are typically located in the bezel area, making it difficult to achieve a narrow bezel design and compromising fingerprint detection accuracy due to scattered light interference.
Innovation Solution
A fingerprint recognition device is integrated into the OLED display panel, featuring a light emitting device, a collimator, and a sensor, where the collimator on the light emitting device's surface transmits collimated light reflected by a fingerprint while blocking scattered light, allowing the sensor to accurately recognize fingerprint ridges and valleys within the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the fingerprint recognition device is integrated into the display area, then the bezel width can be reduced, but scattered light interference increases and detection accuracy deteriorates
Solution Approach 1:
A collimator is introduced as an intermediary component between the light emitting device and the sensor. The collimator includes a light blocking layer with light blocking portions and light transmitting portions that work together to filter scattered light while allowing useful reflected light to pass through, thereby resolving the contradiction between integration and detection accuracy
Solution Approach 2:
The collimator is segmented into distinct functional regions: light blocking portions that filter scattered light and light transmitting portions that allow useful light through. This segmentation enables the device to simultaneously achieve compact integration and high detection accuracy by spatially separating different light handling functions
2Measurement precision
If a collimator is added to block scattered light, then fingerprint detection accuracy improves, but device complexity increases
Solution Approach 1:
The collimator is merged with the light emitting device structure, where the light blocking layer is formed as an integral part of the display panel assembly. This merging approach reduces the number of separate components and simplifies manufacturing while maintaining the scattered light blocking function
Solution Approach 2:
The collimator employs composite material structures combining light blocking materials and transparent materials in a single layer system. This composite approach achieves both scattered light filtering and light transmission functions within a unified structure, reducing overall device complexity
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 solution enhances fingerprint detection accuracy by reducing scattered light interference and enabling fingerprint recognition within the display area, facilitating a narrow bezel or bezel-less design while maintaining practicality and simplicity in manufacturing.
Implementation Method 1
a light emitting device configured to emit light toward a fingerprint contact side
Implementation Method 2
a collimator provided on a surface of the light emitting device away from the fingerprint contact side and configured to allow a portion of light reflected by a fingerprint to transmit therethrough
Implementation Method 3
configured to allow a portion of light reflected by a fingerprint to transmit therethrough to obtain collimated light
Data Source
AI summary
Provided are a fingerprint recognition device and a manufacturing method thereof, a display panel and a manufacturing method thereof, a display device, and a fingerprint recognition method. In the fingerprint recognition device of the present disclosure, the collimator transmits the collimated light reflected by the fingerprint and blocks the scattered light, so that the light emitted by the light emitting layer is reflected by the finger, and the approximately collimated reflected light can transmit through the collimator while the oblique light is blocked by the collimator. The sensor recognizes the ridges and valleys of the fingerprint according to the area through which the light is transmitted by the collimator. The fingerprint recognition device may be manufactured by a simple manufacturing process and have strong practicability, and is suitable for fingerprint collection and recognition in the display area of the organic light emitting diode display.