Lattice Filter for Optical Fingerprint Sensor Light Control
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Solution Overview
Problem
Existing electronic devices face challenges in providing stable and proper light quantity to fingerprint detection systems, affecting the sensitivity of fingerprint identification, particularly in optical type methods where light quantity reaching the sensor is inconsistent.
Innovation Solution
An electronic panel design incorporating a lattice filter with light transmission parts on its rear surface, positioned between the display panel and the light sensing module, ensures controlled light path and improved light sensitivity by filtering and directing light uniformly to the light sensing module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display panel structure is used without a lattice filter, then the device structure remains simple, but the light quantity reaching the optical sensor is inconsistent and insufficient for stable fingerprint detection
Solution Approach 1:
A lattice filter is introduced as an intermediary component between the display panel and the optical sensor. The lattice filter includes a substrate with a lattice structure comprising light blocking parts and light transmission parts, acting as a mediator to control and direct light from the display panel to the optical sensor, thereby stabilizing the light quantity for fingerprint detection.
Solution Approach 2:
The lattice filter divides the light path into multiple segments through its lattice structure with light blocking parts and light transmission parts. This segmentation allows selective transmission of light in specific directions while blocking other paths, enabling precise control of light quantity reaching the optical sensor.
2Measurement precision
If light is allowed to reach the optical sensor without control, then the light quantity may be sufficient, but the light path is uncontrolled and light sensitivity is reduced
Solution Approach 1:
The lattice filter serves as an intermediary that controls the light path between the display panel and optical sensor. By positioning the lattice filter in the light path and using its lattice structure with light blocking parts and light transmission parts, the system achieves precise control over light direction and quantity, thereby improving light sensitivity without requiring complex control mechanisms.
3Measurement precision
If the lattice filter blocks most light to improve sensitivity, then fingerprint detection accuracy improves, but the light quantity reaching the sensor becomes insufficient
Solution Approach 1:
The lattice filter applies local quality control by having different regions with different light transmission properties. The light blocking parts and light transmission parts are spatially distributed to selectively block or transmit light in specific local areas, allowing sufficient light quantity to reach the sensor while maintaining high detection accuracy through directional control.
Solution Approach 2:
The lattice structure segments the light transmission function, with light blocking parts and light transmission parts working together to control light quantity and direction. This segmentation enables the system to maintain adequate light intensity while improving detection accuracy through selective light path control.
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 detection sensitivity by stabilizing light quantity and direction, improving the accuracy and reliability of fingerprint identification in electronic devices.
Implementation Method 1
the lattice filter may have a light blocking material
Implementation Method 2
a lattice filter disposed between the display panel and the light sensing module, and including a plurality of light transmission parts arranged on the rear surface while being spaced apart from each other
Implementation Method 3
a light sensing module disposed on the rear surface and including a light detection element
Data Source
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AI summary
Provided is an electronic device including: a display panel having a front surface and a rear surface that faces the front surface and including a plurality of light emitting areas each of which is disposed on the front surface and displays light, a light sensing module disposed on the rear surface and including a light detection element, and a lattice filter disposed between the display panel and the light sensing module, and including a plurality of light transmission parts arranged on the rear surface while being spaced apart from each other.