OLED Panel Collimation Structure for Fingerprint Crosstalk
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Solution Overview
Problem
Existing organic light-emitting display panels face challenges in large-area fingerprint identification due to ultra-thinness, leading to blurring of fingerprint images, especially at the edges, and poor stitching effects, along with uneven image illuminance caused by polarizers, making it difficult to distinguish fingerprint signals effectively.
Innovation Solution
An organic light-emitting display panel design incorporating a collimation structure with laminated light-shielding layers and through holes that collimate light reflected from a finger to improve fingerprint identification accuracy, while maintaining a simple manufacturing process and reducing production costs by integrating the light-shielding layers with anodes in the same layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light is emitted from the organic light-emitting display panel for fingerprint identification, then fingerprint identification capability is provided, but light crosstalk occurs and fingerprint images blur especially at edges
Solution Approach 1:
The patent divides the light-shielding function into multiple separate layers (first light-shielding layer, second light-shielding layer, third light-shielding layer) positioned at different heights. Each layer contains through holes that are aligned to form collimation channels, segmenting the light path to prevent crosstalk while maintaining fingerprint identification accuracy.
Solution Approach 2:
The patent introduces a vertical dimension by stacking light-shielding layers at different heights above the fingerprint identification device. This three-dimensional arrangement creates collimation channels that guide light vertically, preventing lateral light crosstalk that would otherwise blur fingerprint images.
2Length of stationary object
If the display panel is made ultra-thin, then portability is improved, but fingerprint images blur and stitching effects deteriorate
Solution Approach 1:
The patent nests the light-shielding layers within the existing display panel structure, positioning them above the fingerprint identification device but below or integrated with other panel components. This nesting approach adds the necessary collimation structure without significantly increasing overall panel thickness.
3Ease of operation
If polarizers are used in the display panel, then display functionality is provided, but image illuminance becomes uneven making fingerprint signals difficult to distinguish
Solution Approach 1:
The patent introduces light-shielding layers with collimation channels as an intermediary structure between the light source and fingerprint identification device. This intermediary guides light through specific vertical paths, ensuring uniform illuminance on the fingerprint image while maintaining compatibility with polarizers for display functionality.
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 collimation structure effectively screens out light in a collimated manner, enhancing fingerprint identification accuracy and enabling large-area fingerprint recognition by ensuring that light reaches the fingerprint identification devices with improved collimation and reduced crosstalk, thus overcoming the limitations of existing technologies.
Implementation Method 1
The collimation structure effectively screens out light in a collimated manner, enhancing fingerprint identification accuracy
Implementation Method 2
The collimation structure includes at least two laminated light-shielding layers located on the sides, facing away from the base substrate, of the fingerprint identification devices
Data Source
AI summary
The organic light-emitting display panel includes: a base substrate having sub-pixel regions and non-sub-pixel regions; fingerprint identification devices in the non-sub-pixel regions; anodes in the sub-pixel regions and on sides, facing away from the base substrate, of the fingerprint identification devices; and a collimation structure in the non-sub-pixel regions. The collimation structure includes at least two laminated light-shielding layers on the sides, facing away from the base substrate, of the fingerprint identification devices, and an orthographic projection of each light-shielding layer on the base substrate at least covers orthographic projections of the fingerprint identification devices on the base substrate; at least one through hole is in a position, corresponding to each fingerprint identification device, of each light-shielding layer, and through holes of the light-shielding layers are in one-to-one correspondence; and the light-shielding layer closest to the base substrate is disposed in the same layer as and insulated from the anodes.