Patent ID: 11908229
Assignee: JAPAN DISPLAY INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 8:
9. A biometric authentication device comprising:
a sensor including a first base material, a plurality of photoelectric conversion elements that are arranged in a matrix on the first base material and that output a signal according to an amount of received light, and a first control unit that controls an operation of the photoelectric conversion elements; and
an illumination device including a second base material, a plurality of light emitting elements that are arranged in a matrix on the second base material and that apply light received by the photoelectric conversion elements, and a second control unit that controls an operation of the light emitting elements, wherein
the photoelectric conversion elements and the light emitting elements are divided into a plurality of groups corresponding to each other,
upon lighting the light emitting element at a predetermined position in the groups of the light emitting elements by the second control unit, the first control unit controls the operation of the photoelectric conversion elements so as to acquire a signal from the photoelectric conversion elements at predetermined positions of the groups of the photoelectric conversion elements, the positions corresponding to the lit light emitting element,
the first control unit creates a first image showing an authentication target based on signals acquired from the photoelectric conversion elements,
the first control unit creates a second image in which the first image is binarized based on the created first image, and creates a third image in which a center line of a black portion of the second image alone is drawn based on the created second image, and
the second control unit controls the operation of the light emitting elements so as to light light emitting elements disposed at positions overlapping the center line drawn in the third image created by the first control unit.