Fingerprint Sensor Screen With Integrated Push Button
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Solution Overview
Problem
Capacitive fingerprint sensors face challenges due to complex assembly constructions, increased size, and non-display area requirements, as well as limitations in fingerprint recognition sensitivity and sensor placement, particularly when integrating high-resolution sensor arrays with push buttons.
Innovation Solution
A sensor screen design featuring a flexible printed circuit board with fingerprint electrodes arranged in a specific pattern, allowing for reduced thickness and increased sensitivity, and eliminating the need for assembly with a push button, by positioning the fingerprint sensor within the active area and using a thinner second base member to enhance recognition rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a silicon wafer is used to integrate the IC with the high resolution sensor array, then the fingerprint recognition precision is improved, but the device complexity and non-display area increase due to the required assembly construction with push button
Solution Approach 1:
The patent merges the fingerprint sensor array and the push button into a single integrated structure where the push button is formed directly on the sensor array. This eliminates the need for separate assembly construction while maintaining high resolution fingerprint recognition capability through the integrated design.
Solution Approach 2:
The push button structure serves multiple functions: it acts as both a mechanical input device and a fingerprint sensing area. The sensor array underneath detects fingerprints on the button surface, making the button multi-functional rather than requiring separate fingerprint sensor and button components.
2Reliability
If a push button is used with the capacitive fingerprint sensor, then the fingerprint sensing function is achieved, but the thickness and non-display area increase
Solution Approach 1:
The push button and fingerprint sensor are merged into a single integrated component where the button is formed directly on the sensor array. This integration eliminates the need for separate layers and reduces overall device thickness while maintaining fingerprint sensing functionality.
3Ease of operation
If the push button overlaps the fingerprint sensor, then the mechanical input function is achieved, but the sensing area is reduced
Solution Approach 1:
The push button is designed to serve dual purposes: mechanical input and fingerprint sensing. The entire button surface functions as a fingerprint sensing area, maximizing the sensing area while maintaining full mechanical input capability without overlap restrictions.
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
This design enhances fingerprint recognition sensitivity, reduces sensor size and complexity, and allows for more flexible placement, improving overall performance and usability in display devices.
Implementation Method 1
The capacitive fingerprint sensor utilizes a difference of electric charges charged between ridges and valley of the finger contacted thereto.
Data Source
AI summary
A sensor screen and a display device including the same are discussed. The sensor screen can include a first base member including a first active area and a first bezel area and having a first thickness, a second base member positioned opposite the first base member and having a second thickness less than the first thickness; and a fingerprint sensor disposed on one of the first and second base members which are positioned opposite each other. The fingerprint sensor can include a first group of fingerprint electrodes, which are arranged in a first direction in a portion of the first active area, and a second group of fingerprint electrodes, which are insulated from the first group of fingerprint electrodes and are arranged in a second direction crossing the first direction.