Patent ID: 8669843
Filing Date: 2014-03-11
Classification: G06K

Abstract:
1. A touch control device with fingerprint detection comprising: a plurality of detecting units configured as a detecting matrix having a plurality of rows and columns, each of the detecting units comprising a fingerprint electrode, a first switch coupled to the fingerprint electrode, and a storage capacitor coupled to the fingerprint electrode; wherein when a finger is touching one of the detecting units, a sense capacitor is formed between the fingerprint electrode of that touched detecting unit and the finger in such a manner that the sense capacitor is connected in parallel to the storage capacitor to form an equivalent capacitor; a driving circuit, coupled to the detecting units, for providing a charging signal to charge the equivalent capacitor within each of the detecting units, wherein a capacitance of the equivalent capacitor is determined in part according to whether the sense capacitor is formed within the detecting unit; a reading circuit, coupled to the detecting units, for reading a voltage of the equivalent capacitor of each of the detecting units after the equivalent capacitor is charged; a selecting circuit, coupled to the detecting matrix via a plurality of control lines, each of the control lines being coupled to one row of the detecting units, for selecting each row of the detecting units in order during a write interval and a read interval respectively, wherein the write interval occurs before the read interval; wherein, the driving circuit provides the charging signal to the selected detecting units via the first switch during the write interval, and the reading circuit reads the voltage of the equivalent capacitor of each selected detecting unit via the same first switch during the read interval; and a switching circuit, coupled to the driving circuit and the reading circuit, for coupling to the detecting matrix via a plurality of data lines, wherein each of the data lines is coupled to one column of the detecting units; wherein the switching circuit couples the data lines to the driving circuit during the write interval, and couples the data lines to the reading circuit during the read interval; wherein the first switch of each of the detecting units is coupled between one of the data lines and the fingerprint electrode and receives a control signal from one of the control lines so as to control whether the first switch is closed; wherein the first switch of the selected detecting unit is closed during the write interval such that the selected detecting unit receives the charging signal via the data line coupled to the first switch; the first switch of the selected detecting unit is closed during the read interval such that the reading circuit performs reading via the same data line coupled to the first switch; wherein the detecting units are configured within the detecting matrix as a fingerprint detecting area and a touch control area, and wherein a density of the detecting units within the fingerprint detecting area is greater than the density of the detecting units within the touch control area.