Texture Detection Module with Segmented Emission Electrodes

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Solution Overview

Problem

Current ultrasonic fingerprint identification technologies face challenges in achieving high accuracy due to low vibration intensity differentiation between valley and ridge positions of textures, leading to inaccurate texture identification.

Innovation Solution

A texture detection module comprising an emission electrode layer, a receiver electrode layer, and a piezoelectric film, where the emission electrode layer includes insulated first and second emission sub-electrodes arranged in rows and columns, allowing for focused ultrasonic wave emission and improved signal collection to enhance texture identification accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional peak detection or amplitude modulation methods are used to detect reflected waves, then the device complexity is low, but the texture identification accuracy is low

Engineering Contradiction:

Improvetexture identification accuracyVSAvoidemission electrode structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The emission electrode is divided into multiple emission sub-electrodes arranged in rows and columns, with each sub-electrode independently controllable. This segmentation allows selective emission from different positions to enhance signal differentiation between valley and ridge positions, directly improving texture identification accuracy while maintaining manageable device complexity through modular structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different emission sub-electrodes are activated based on local detection needs. By selectively emitting ultrasonic waves from specific sub-electrodes corresponding to valley or ridge positions, the system enhances local signal quality and vibration intensity differentiation, thereby improving overall texture identification accuracy without requiring all electrodes to operate simultaneously

Inventive Principle:

Principle #3Local quality

2Measurement precision

If multiple emission sub-electrodes are used to improve signal differentiation, then the texture identification accuracy is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improvevibration intensity differentiationVSAvoidemission electrode layer fabrication

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The emission electrode layer is fabricated as a segmented structure with multiple sub-electrodes that can be independently patterned and connected. This segmentation enables precise control over electrode geometry and positioning, facilitating manufacturing processes while achieving the required vibration intensity differentiation for accurate texture identification

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The emission sub-electrodes are arranged in a two-dimensional grid pattern (rows and columns) rather than a single linear array. This dimensional expansion provides more degrees of freedom for signal differentiation and improves manufacturing flexibility, allowing standard photolithography and patterning techniques to be applied more effectively

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 improves the accuracy of texture identification by combining signals from multiple emission directions, effectively differentiating between valley and ridge positions, thereby enhancing the precision of fingerprint and palm print recognition.

Implementation Method 1

a piezoelectric film between the emission electrode layer and the receiver electrode layer

Methodology Applied

Scientific EffectPiezoelectric effect: Piezoelectric Effect

Implementation Method 2

when reflected waves touch textures (fingerprint or palm print), due to differences between valley positions and ridge positions of the textures, vibration intensities of the reflected waves of different textures will be different

Methodology Applied

Scientific EffectUltrasonic vibration: Ultrasonic Vibration

Data Source

PatentUS11568672B2Texture detection module, method for driving the same and display device

Publication Date: 2023.01.31 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure provides a texture detection module, a method for driving the same and a display device. The texture detection module includes: an emission electrode layer; a receiver electrode layer; and a piezoelectric film between the emission electrode layer and the receiver electrode layer. The emission electrode layer includes emission electrodes, first emission signal lines and second emission signal lines. The emission electrodes include first emission sub-electrodes and second emission sub-electrodes that are insulated from the first emission sub-electrodes. The first emission sub-electrodes are arranged in N rows and M columns, N and M are both positive integers; the first emission sub-electrodes located in an identical row are electrically coupled to one identical first emission signal line. The second emission sub-electrodes are arranged in X rows and Y columns, X and Y are both positive integers; the second emission sub-electrodes located in an identical column are electrically coupled to one identical second emission signal line.