Each kind of technology has its shortcomings, they don’t seem to be excellent. For instance, the capacitive contact, which is broadly utilized by Apple, can not be operated when folks put on the gloves; the optical touch can be used successfully on the large display, whereas it has no use for the small display. The patent of the primary contact technology has been overdue, such because the capacitive, infrared ray and ultrasonic contact. There are twenty to thirty years up to now. Therefore, extra researches are needed on this business. The preferred cocoa touch technology is projective capacity, which can measure the change of the current by finger. The advantage of the projective capacity can implement the actual touch; however, it can be operated only by the finger pulp. The associated built-in circuit is MC14490P.
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