Patent ID: 7893396

Claim:
A device comprising: a first light source which emits light to be irradiated onto a subject; a first light guide unit which receives light radiated from the subject and which outputs received light; a second light guide unit for guiding and irradiating the light emitted from the first light source onto the subject; a sensor unit which detects light outputted from the first light guide unit as a signal; a liquid crystal display unit positioned between the subject and the first light guide unit; a control unit which controls the liquid crystal display unit to display a mask image formed by a mask section and a non-mask section, and a signal processing unit for processing said signal detected by the sensor unit, wherein the control unit controls the liquid crystal display unit so that the non-mask section is formed in an area of the liquid crystal display unit corresponding to a surface region of the second light guide unit and corresponding to a part of a surface region of the first light guide unit, and controls the liquid crystal display unit so that a position of the non-mask section corresponding to a part of the surface region of the first light guide unit changes, wherein the signal processing unit generates an image including a biometric pattern of the subject based on the signal detected by the sensor unit from changes in the position of the non-mask section corresponding to a part of the surface region of the first light guide unit.