Collimating Structure for Fingerprint Recognition
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Solution Overview
Problem
Existing display technologies face challenges in acquiring clear images of objects at large distances due to blurring and crosstalk between light rays, particularly when recognizing fingerprints, leading to inaccurate texture recognition and high process complexity.
Innovation Solution
A collimating structure comprising alternating light-shielding and light-transmitting layers, where the light-shielding layers define a light convergence angle and an intermediate layer shields crosstalk, allowing precise recognition of fingerprint details by collimating light through light-transmitting holes, thereby improving image clarity and reducing device thickness and process complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a collimating structure is added to improve image clarity and reduce crosstalk, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The collimating structure is divided into multiple light-shielding layers with light-transmitting parts, where each layer is spaced apart to define a light convergence angle. This segmentation approach enables effective collimation and crosstalk reduction while maintaining manageable structural complexity through modular design
Solution Approach 2:
The patent transitions from a traditional single-layer or two-layer collimating structure to a multi-layer configuration where layers are stacked in the vertical dimension. This dimensional expansion allows for improved light control and reduced crosstalk without significantly increasing lateral device footprint
2Measurement precision
If multiple light-shielding layers are stacked to reduce crosstalk, then measurement precision is improved, but device thickness increases
Solution Approach 1:
The patent optimizes the spacing between light-shielding layers and the dimensions of light-transmitting parts to define a specific light convergence angle. By carefully controlling these geometric parameters, the structure achieves effective collimation and crosstalk reduction while minimizing the overall thickness of the multi-layer assembly
3Measurement precision
If light-transmitting parts are made smaller to improve resolution, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The collimating structure uses multiple light-shielding layers with light-transmitting parts, where corresponding parts in different layers align to form vertical channels. This segmentation allows for smaller effective aperture sizes for better resolution while distributing the manufacturing tolerance requirements across multiple layers rather than demanding extreme precision in a single layer
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 achieves precise recognition of fingerprint details by collimating light effectively, reducing device thickness and process complexity, and enhancing the accuracy of texture information acquisition.
Implementation Method 1
The top light-shielding layer and the bottom light-shielding layer are configured to define a light convergence angle of the collimating structure
Implementation Method 2
the intermediate light-shielding layer is configured to shield crosstalk between light of the plurality of the light-transmitting parts
Data Source
AI summary
A collimating structure, a method for fabricating the same and a display device are provided. The collimating structure includes a plurality of light-shielding layers with light-transmitting parts, and the distances between the respective light-shielding layers are adjusted using light-transmitting layers to thereby achieve a desirable depth-to-width ratio of a column of holes so as to define a light convergence angle of the collimating structure. At least one intermediate light-shielding layer is arranged between the top light-shielding layer and the bottom light-shielding layer, and the distances between the respective light-shielding layers are adjusted using the light-transmitting layers, so that crosstalk between light of the light-transmitting parts can be shielded to thereby improve the accuracy of recognized information about texture.