Touch-Area Fingerprint Unlocking for Faster LCD Initialization

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Solution Overview

Problem

The existing fingerprint unlocking processes in electronic devices are inefficient due to lengthy initialization times of the liquid crystal display (LCD) screen, which delays the overall fingerprint unlocking process.

Innovation Solution

The method involves generating an interrupt instruction upon a touch operation on the fingerprint recognition region, allowing simultaneous initialization of the touchscreen and detection of the touch area, and illuminating the backlight only when the touch area meets a threshold, thereby optimizing the fingerprint unlocking process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the LCD screen is initialized before fingerprint recognition, then the screen display is ensured, but the fingerprint unlocking time is extended

Engineering Contradiction:

Improvescreen display reliabilityVSAvoidfingerprint unlocking time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by initiating the LCD screen initialization process in advance, before the fingerprint recognition is completed. The system starts the initialization sequence when the fingerprint module is activated, so that the screen is ready for display by the time fingerprint recognition finishes, thereby eliminating the sequential time delay while ensuring display reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements continuity of useful action by running the LCD initialization process concurrently with the fingerprint recognition process. Instead of waiting for one process to finish before starting the other, the system executes both initialization and recognition operations simultaneously, maximizing resource utilization and minimizing total unlocking time while maintaining screen display reliability.

Inventive Principle:

Principle #20Continuity of useful action

2Measurement precision

If the backlight is illuminated during fingerprint recognition, then the recognition accuracy is improved, but the power consumption is increased

Engineering Contradiction:

Improvefingerprint recognition accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies periodic action by illuminating the backlight only during specific periods when fingerprint recognition is actively needed, rather than maintaining continuous illumination. The system activates the backlight temporarily during the critical recognition phase and turns it off afterward, achieving the required recognition accuracy while significantly reducing overall power consumption.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements local quality by selectively illuminating only the necessary portion of the backlight corresponding to the fingerprint recognition area, rather than illuminating the entire screen. This localized illumination approach provides sufficient light for accurate fingerprint recognition in the specific region where it is needed, while minimizing power consumption by avoiding unnecessary illumination of other screen areas.

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If the entire screen is illuminated during fingerprint unlocking, then the display visibility is improved, but the power waste is increased

Engineering Contradiction:

Improvedisplay visibilityVSAvoidpower waste

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The patent applies local quality by illuminating only the specific region where the fingerprint recognition takes place rather than illuminating the entire screen. This localized illumination ensures that the display visibility is sufficient for the user to see the fingerprint recognition area clearly, while minimizing power waste by avoiding unnecessary illumination of other screen regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements periodic action by providing illumination only during the brief period when fingerprint recognition is active, rather than maintaining continuous screen illumination. The backlight is activated temporarily during the critical recognition phase and turned off afterward, achieving necessary display visibility while significantly reducing overall energy consumption.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20250329188A1Fingerprint unlocking method, electronic device, readable storage medium, and chip

Publication Date: 2025.10.23 HONOR DEVICE CO LTD

AI summary

This application discloses a fingerprint unlocking method, an electronic device, a readable storage medium, and a chip, and pertains to the field of terminal technologies. The method is applied to an electronic device, and the method includes: generating an interrupt instruction and detecting a touch area of a touch operation in response to the touch operation on a fingerprint recognition region in a touchscreen of the electronic device; controlling, in response to the interrupt instruction, the touchscreen to perform an initialization operation; illuminating a backlight of the electronic device when initialization on the touchscreen is completed and the touch area is greater than or equal to an area threshold; and controlling, when the backlight is illuminated, the electronic device to perform a fingerprint unlocking operation.