Optoelectric Sensor Fiber Optic Plate Resolution
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Solution Overview
Problem
Current optical fingerprint sensors are bulky, have low resolution, and are difficult to integrate into portable devices due to their complex structure and inadequate signal range, limiting their multifunctionality and compactness.
Innovation Solution
An optoelectric sensor design featuring a light-sensitive structure with a substrate and pixel cells, a fiber optic plate with perpendicular optical fiber bundles, and a backlight source, which improves resolution by minimizing interference between pixel cells and ensuring uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a bended optical fiber array is used to ensure adequate signal range, then the detection area is increased, but the device size and complexity increase making it difficult to integrate into portable devices
Solution Approach 1:
Instead of bending the optical fiber array to achieve adequate signal range, the patent inverts the approach by using a planar optical fiber array with a specifically designed pattern of light-blocking structures. These structures block stray light while allowing the optical fibers to remain flat and compact, thus achieving adequate signal range without increasing device complexity or making integration into portable devices difficult.
2Area of stationary object
If the optical fiber array is configured with a bended shape to increase detection area, then more finger surface can be detected, but the overall system size increases
Solution Approach 1:
The patent solves the contradiction between detection area and system volume by transitioning from a two-dimensional bended configuration to a three-dimensional planar configuration with vertical light-blocking structures. The light-blocking structures extend in the vertical dimension to block stray light, allowing the optical fiber array to maintain a compact planar form while still achieving adequate detection area through the patterned arrangement of fibers and blockers.
3Device complexity
If the light source is positioned at one side of the optical fiber array, then the structure is simplified, but uniform light distribution across the finger surface is poor
Solution Approach 1:
The patent applies local quality by positioning light-blocking structures at specific locations within the optical fiber array rather than using a symmetric or uniform configuration. These localized light-blocking structures are strategically placed to redirect light from side-positioned light sources, ensuring that each region of the optical fiber array receives adequate and uniform light distribution while maintaining simple overall structure.
4Measurement precision
If pixel cells are designed with complicated structures to improve signal detection, then detection capability is enhanced, but interference between adjacent pixel cells increases
Solution Approach 1:
The patent applies segmentation by dividing the optical fiber array into distinct regions with light-blocking structures positioned between adjacent pixel cell groups. These segmented light-blocking structures physically separate the light paths reaching different pixel cells, reducing cross-talk and interference between adjacent pixel cells while allowing each pixel cell to maintain its signal detection capability.
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 enhances the resolution and compactness of the optoelectric sensor, enabling its integration into portable devices while reducing manufacturing costs and improving signal-to-noise ratio.
Implementation Method 1
each of the pixel cell includes a thin film transistor and a photodiode
Implementation Method 2
the FOP includes an array of optical fiber bundles which are configured to be perpendicular to the substrate
Data Source
AI summary
An optoelectric sensor, comprising: a light-sensitive structure which comprises a substrate and an array of pixel cells located on the substrate, wherein each of the pixel cells comprises a thin film transistor and a photodiode; a fiber optical guide plate located above the light-sensitive structure, which comprises a group of optical fiber bundles configured to be perpendicular to the substrate, and each of the optical fiber bundles has an diameter smaller than or equal to a width of pixel cell; and a backlight source located below the light-sensitive structure. The fiber plate will enable each pixel cell detecting features of an object surface corresponding thereto more independently, so as to improve the resolution of the optoelectric sensor. The optical fiber bundles are configured to be perpendicular to the substrate, and the optoelectric sensor will have a thin structure.


