| 摘要 |
The functionality of a touchpad and fingerprint sensor into a single sensor. This is achieved by using a conventional high resolution finger detecting sensor, such as a capacitive sensor, coupled to a processor running appropriate software which performs either fingerprint operations or finger motion detection as a function of the application required to be performed at any particular time by a user. More specifically, in a first mode for performing fingerprint operations, the software interacts with the capacitive sensor to obtain a fingerprint "image", if there is a finger in contact with the sensor, and to process the fingerprint images, such as analyzing it to detect patterns, storing the fingerprint image, or comparing the fingerprint image against other stored fingerprint images. a second mode, for performing finger motion detection, the software obtains successive fingerprint images and analyzes them to detect direction of motion and amount of motion, e.g., by identifying particular features of the fingerprint and determining their location in each of the successive fingerprint images. Advantageously, a savings in both cost and space required is achieved with respect to the prior art systems. <IMAGE> |
