Touch Display Fingerprint Acquisition Brightness Control
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Solution Overview
Problem
Current fingerprint collection methods in terminal devices often result in low-quality fingerprints due to inadequate illumination, which affects the accuracy of fingerprint recognition and unlocking processes.
Innovation Solution
A method utilizing an optical fingerprint sensor and a touch display screen with a preset region that emits brighter light, specifically using a combination of green, red, and blue sub-pixels to increase illumination while maintaining constant power consumption, thereby enhancing fingerprint quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional fingerprint acquisition methods are used, then the process is simple, but the acquisition quality is poor when fingerprints are contaminated with sebum or sweat
Solution Approach 1:
The patent introduces a fingerprint acquisition solution comprising a solvent and a developing agent as intermediary substances. The solvent removes contaminants (sebum, sweat) from the fingerprint, while the developing agent enhances the visibility of fingerprint ridges. This intermediary chemical treatment process bridges the gap between contaminated fingerprints and clear acquisition images, resolving the contradiction between maintaining simplicity and improving quality.
Solution Approach 2:
The patent changes the chemical parameters of the fingerprint surface by applying specific solvents and developing agents. The solvent modifies the surface composition by dissolving contaminants, and the developing agent alters the optical properties to enhance ridge visibility. These parameter changes enable high-quality acquisition even when the fingerprint is initially contaminated, addressing the quality-complexity contradiction.
2Measurement precision
If multiple processing steps are added to improve fingerprint quality, then acquisition quality improves, but processing time increases
Solution Approach 1:
The patent applies the solvent and developing agent in a preliminary manner before the actual fingerprint scanning or imaging process. By pre-treating the fingerprint with the solvent-developing agent combination, the contaminants are removed and ridges are enhanced in advance, so that the subsequent acquisition process can proceed quickly without needing multiple corrective steps, thus reducing overall processing time while maintaining quality.
Solution Approach 2:
The patent ensures continuous useful action by having the solvent and developing agent work in sequence without interruption. The solvent first removes contaminants, then the developing agent immediately enhances the ridges, creating a continuous chemical treatment process that efficiently prepares the fingerprint for acquisition without idle time between steps, thereby minimizing processing time while achieving high quality.
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 increased brightness of the light emitted in the preset region improves the contrast and clarity of the fingerprint, leading to higher quality fingerprint collection and improved recognition accuracy.
Implementation Method 1
the solvent to remove sebum and sweat from the fingerprint
Implementation Method 2
the developing agent to enhance optical effects related to the ridges of the fingerprint
Data Source
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AI summary
A fingerprint acquisition method and a related product. The method comprises: controlling a light-emitting unit in a preset region of a touch display screen (120) to emit light (S501), wherein the brightness of light emitted by the light-emitting unit in the preset region of the touch display screen (120) is greater than that of light emitted by light-emitting units in other regions of the touch display screen (120); and acquiring a fingerprint of a user irradiated by the light emitted by the light-emitting unit in the preset region of the touch display screen (120) (S502). The quality of the acquired fingerprint can be improved.