Bezel Fingerprint Sensor Screen with Flexible Circuit Board
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Solution Overview
Problem
Capacitive fingerprint sensors face challenges due to complex assembly constructions, increased non-display areas, and thickness issues, as well as limitations in size and location due to the integration of high-resolution sensor arrays with integrated circuits.
Innovation Solution
A sensor screen design featuring fingerprint sensors in the bezel area with flexible printed circuit boards hosting fingerprint ICs, eliminating the need for assembly with a push button and allowing for thinner, more sensitive designs, with base members of tempered glass and hard-coated plastic for strength and reduced thickness.
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 fingerprint recognition precision is improved, but device complexity and non-display area increase due to the required assembly construction with push button
Solution Approach 1:
The patent divides the fingerprint sensor into two separate components: a high-resolution sensor array and an IC. The sensor array is integrated into the display panel while the IC is mounted on a flexible printed circuit board (FPC) located in the bezel area. This segmentation eliminates the need for complex assembly construction with push buttons while maintaining fingerprint recognition precision.
Solution Approach 2:
The patent relocates the IC from the sensor array integration plane to the bezel area using a flexible printed circuit board. This dimensional relocation allows the IC to be positioned outside the display area, reducing non-display area and simplifying the overall assembly construction while preserving measurement precision.
2Strength
If a push button is used to couple the fingerprint sensor, then structural support is provided, but thickness and non-display area increase
Solution Approach 1:
The patent extracts the IC from the sensor array integration and relocates it to the bezel area on an FPC. This extraction eliminates the need for push button coupling, thereby reducing both thickness and non-display area while maintaining structural support through alternative means.
Solution Approach 2:
The patent uses a flexible printed circuit board (FPC) to mount the IC in the bezel area. The FPC provides a thin, flexible substrate that supports the IC without requiring thick push button structures, thereby reducing overall device thickness while maintaining structural integrity.
3Extent of automation
If the IC is integrated with the sensor array, then fingerprint processing capability is improved, but the sensing area is limited by the push button size
Solution Approach 1:
The patent relocates the IC to the bezel area using a flexible printed circuit board, separating it from the sensor array integration plane. This dimensional separation allows the sensing area to extend beyond the limitations imposed by push button size, as the IC is no longer constrained to be directly coupled with the sensor array through a push button structure.
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 and removes size and location limitations, providing a more compact and effective fingerprint sensing solution without the need for complex assembly structures.
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 described. 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 which is positioned opposite the first base member and has a second thickness less than the first thickness, and at least one fingerprint sensor disposed in a portion of the first bezel area of one of the first and second base members. The fingerprint sensor can include a plurality of first fingerprint electrodes arranged in a first direction and a plurality of second fingerprint electrodes, which are insulated from the first fingerprint electrodes and are arranged in a second direction crossing the first direction.