Fingerprint Sensing Module Light Guide Structure
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Solution Overview
Problem
Fingerprint recognition on LCD panels is hindered by light field directivity due to external light sources, resulting in inconsistent fingerprint images and higher error rates.
Innovation Solution
A fingerprint sensing module for LCD panels incorporating a light source and shielding frames or light guide structures to redirect light away from the sensing area, creating a non-directional and uniform light field, or using lenses to concentrate light, thereby reducing directivity and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If external light sources are used to provide light emission for fingerprint sensing on LCD panel, then light emission for sensing is achieved, but light field directivity causes inconsistency on fingerprint images at different degrees or distances
Solution Approach 1:
The patent introduces a light guiding structure as an intermediary component between the light source and the fingerprint sensing area. This structure guides and distributes the light from the external light source to illuminate the fingerprint sensing area uniformly, eliminating the directivity problem while maintaining adequate illumination intensity for accurate fingerprint recognition.
Solution Approach 2:
The patent changes the spatial distribution parameters of light emission by using a light guiding structure. Instead of direct light emission from the source, the structure modifies the light propagation path and angular distribution, transforming the directional light field into a more uniform illumination pattern across the sensing area.
2Ease of operation
If external light sources are disposed around the panel for providing light emission, then fingerprint sensing is enabled, but light field directivity results in higher error rate on fingerprint recognition
Solution Approach 1:
The light guiding structure serves as a mediator that decouples the light source positioning from the illumination pattern. It enables fingerprint sensing capability while simultaneously ensuring uniform light distribution, thereby maintaining measurement precision and image consistency across different sensing positions.
Solution Approach 2:
The patent addresses the directional light field problem by introducing a spatial transformation through the light guiding structure. This structure redistributes light in additional spatial dimensions, converting the concentrated directional emission into a two-dimensional uniform illumination field that covers the entire sensing area evenly.
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 enhances fingerprint image quality by eliminating directional light interference, resulting in improved accuracy and consistency of fingerprint recognition.
Implementation Method 1
The light guide structure, disposed on an emitting surface of the light source, is configured to orient light emitted by the light source toward a direction opposite to the first side
Implementation Method 2
The lens, disposed on an emitting surface of the light source, is configured to concentrate light emitted by the light source to a direction not at the first side
Data Source
AI summary
A fingerprint sensing module is used for a liquid crystal display (LCD) panel having a sensing area. The fingerprint sensing module includes a light source and a shielding frame. The light source is configured to provide light emission for fingerprint sensing performed on the sensing area, wherein the sensing area is at a first side of the light source. The shielding frame is disposed on a light emission path from the light source toward the first side.