Patent ID: 9569038
Date: 2017-02-14
CPC Classifications: G06F

Claim:
1. A display device provided with a touch panel of capacitance type, wherein: the touch panel of capacitance type includes a plurality of X-electrodes and a plurality of Y-electrodes; the X-electrode and the Y-electrode intersecting with each other via a first insulating layer, each of which is formed to have a pad portion and a thin line portion alternately arranged in an extending direction, and the pad portion of the X-electrode and the pad portion of the Y-electrode are arranged without being overlapped in a planar view; and the display device comprises: a measurement circuit, the measurement circuit being configured to measure an interelectrode capacitance at each intersection between the plurality of X-electrodes and the plurality of Y-electrodes by applying a pulse signal sequentially to one of the X-electrode and the Y-electrode, and detecting a signal from the other electrode; a data storage circuit, the data storage circuit having a two-dimensionally arranged data table that stores an interelectrode capacitance value measured by the measurement circuit at each of the intersections between the plurality of X-electrodes and the plurality of Y-electrodes; and a control circuit, the control circuit being configured to calculate a touched position on the touch panel of capacitance type based on a local minimal point as an intersection with the interelectrode capacitance value that is equal to or smaller than each of the interelectrode capacitance values of adjacently surrounding four peripheral intersections among those at the respective intersections stored in the two-dimensionally arranged data table of the data storage circuit, and a local maximal point as an intersection with the interelectrode capacitance value that is equal to or larger than each of the interelectrode capacitance values of four adjacent peripheral intersections among those at the respective intersections stored in the two-dimensionally arranged data table of the data storage circuit, and determines that the touch panel of capacitance type is touched with a human finger or a conductive pen when the touched position is calculated based on the local minimal point, and determines that the touch panel of capacitance type is touched with an insulating pen when the touched position is calculated based on the local maximal point.