Fingerprint sensing method based on touch pressure in black screen mode of touch input device and touch input device for the same

A touch input device comprising:

• a pressure sensor which senses pressure applied by an object;
• a fingerprint sensor which recognizes a fingerprint of the object;
• and
• a processor configured to:
• determine whether a first pressure has been sensed, the first pressure having a value equal to or greater than a first predetermined threshold value and being applied by the object in a black screen mode;
• display at least one icon on the black screen of the display when the first pressure is sensed,
• determine continuously after sensing the first pressure whether a second pressure which has a value equal to or greater than a second predetermined threshold value and is different from the first pressure is sensed or not;
• display a fingerprint image for recognizing a fingerprint of the object on the black screen of the display when the second pressure is sensed,
• determine whether or not the fingerprint recognized by the second pressure is identical to a fingerprint previously registered in the touch input device;
• and
• display a home screen on the display when the recognized fingerprint is identical to the previously registered fingerprint;
• wherein the second predetermined threshold value which is for determining sense of the second pressure is higher than the first predetermined threshold value which is for determining sense of the first pressure;
• wherein the at least one icon is different from the fingerprint image, and
• wherein the at least one icon and the fingerprint image are output on the black screen of the display so as not to overlap each other.