Spatially-Configurable Localized Illumination for Biometric Authentication

An electronic device comprising:

• a touch-sensitive display;
• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the one or more processors to:
• receive, at a region of the touch-sensitive display, a fingertip touch input from a user, the fingertip touch input in sustained contact with the touch-sensitive display;
• determine, responsive to the receipt and based on the fingertip touch input, a shape of a contact area of the sustained contact with the touch-sensitive display;
• alter, based on the determined shape of the contact area of the sustained contact, a brightness of the region of the touch-sensitive display, the alteration sufficient to enable a biometric authentication system to receive a reflection of the fingertip touch input;
• receive the reflection of the fingertip touch input;
• and
• analyze, responsive to the receipt of the reflection, the reflection at the biometric authentication system effective to enable the biometric authentication system to authenticate the user.