Flexible Display Panel Fingerprint Recognition Light Shielding Layer
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Solution Overview
Problem
Existing flexible display panels for fingerprint recognition fail to achieve a balance between flexibility and display effect, leading to suboptimal performance in both flexibility and recognition accuracy.
Innovation Solution
A flexible display panel design incorporating a flexible substrate base plate, a cover plate, a light shielding layer with imaging holes, a fingerprint acquisition element, and a functional film layer, which includes a light-emitting layer and touch film, arranged to minimize the light shielding layer's impact on display while enhancing flexibility and recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light shielding layer is added to enable fingerprint recognition, then fingerprint recognition capability is improved, but display quality deteriorates due to light blocking
Solution Approach 1:
The light shielding layer is segmented into multiple discrete imaging holes arranged in an array pattern rather than a continuous shield. This segmentation allows light to pass through specific regions (holes) for fingerprint recognition while blocking light in other regions, thereby enabling both fingerprint acquisition and display functionality to coexist without mutual interference
Solution Approach 2:
The light shielding layer exhibits local quality variation: it is opaque in most areas to block light for display, but has transparent regions (imaging holes) specifically positioned for fingerprint recognition. This localized transparency/opacity differentiation allows the same layer to serve dual functions of display and fingerprint sensing
2Measurement precision
If the light shielding layer thickness is increased to improve fingerprint recognition accuracy, then recognition accuracy is improved, but flexibility deteriorates
Solution Approach 1:
The thickness of the light shielding layer is optimized to a specific range (50-200 μm) that balances two competing requirements: sufficient thickness to provide adequate light blocking for accurate fingerprint imaging, and sufficient thinness to maintain the flexibility of the overall display panel. This parameter optimization resolves the contradiction between recognition accuracy and flexibility
3Use of energy by moving object
If imaging holes are made larger to improve light transmission, then light transmission is improved, but fingerprint recognition precision deteriorates
Solution Approach 1:
The aperture of imaging holes is optimized to a specific range (5-20 μm) that balances light transmission and imaging precision. Holes that are too large would allow excessive light leakage reducing contrast, while holes that are too small would block insufficient light. The optimized aperture ensures adequate light transmission for fingerprint imaging while maintaining sufficient precision for accurate recognition
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 design improves flexibility and display quality while achieving accurate fingerprint recognition by optimizing the light shielding layer's thickness, imaging hole arrangement, and fingerprint acquisition element placement, resulting in enhanced image quality and recognition success rates.
Implementation Method 1
The light shielding layer has a fingerprint recognition area, and the light shielding layer at the fingerprint recognition area has a plurality of imaging holes arranged in an array
Data Source
AI summary
This disclosure provides a flexible display panel for fingerprint recognition, a display device and a fingerprint recognition method. The flexible display panel for fingerprint recognition includes a flexible substrate base plate and a cover plate provided opposite to each other to form a cell, wherein the flexible substrate base plate includes a first flexible layer; a light shielding layer disposed below the first flexible layer, wherein the light shielding layer has a fingerprint recognition area, and the light shielding layer at the fingerprint recognition area has a plurality of imaging holes arranged in an array; a fingerprint acquisition element disposed on a side of the flexible substrate base plate away from the cover plate and opposite to the fingerprint recognition area; and a functional film layer disposed between the flexible substrate base plate and the cover plate.