Patent ID: 8711123
Filing Date: 2014-04-29
Classification: G06F

Abstract:
1. A multi-touch recognition resistive touchscreen comprising: a first resistive layer which comprises a plurality of first resistive stripes disposed parallel with one another; a second resistive layer which comprises a plurality of second resistive stripes disposed perpendicularly to the first resistive stripes and faces the first resistive layer; a plurality of X+ electrodes each disposed at one end of each of the first resistive stripes; a plurality of X− electrodes each disposed at the other end of each of the first resistive stripes; a plurality of Y+ electrodes each disposed at one end of each of the second resistive stripes; a plurality of Y− electrodes each disposed at the other end of each of the second resistive stripes; a plurality of Y+ stripe selection switches disposed corresponding one to one to the plurality of Y+ electrodes; a plurality of Y− stripe selection switches disposed corresponding one to one to the plurality of Y− electrodes; a Y+ capacitor connected at one end thereof to ground; a Y+ equal resistance line switch disposed between the Y+ capacitor and the Y+ stripe selection switch to determine whether the Y+ capacitor is connected at the other end thereof to the plurality of Y+ stripe selection switches; a Y− capacitor connected at one end thereof to ground; a Y− equal resistance line switch disposed between the Y− capacitor and the Y− stripe selection switch to determine whether the Y− capacitor is connected at the other end thereof to the plurality of Y− stripe selection switches; a Y+ capacitor voltage detection unit which measures voltage applied to the Y+ capacitor in a state in which the first resistive stripe and the second resistive stripe are in contact with each other by touch, a voltage V a Y− capacitor voltage detection unit which measures voltage applied to the Y+ capacitor in a state in which the first resistive stripe and the second resistive stripe are in contact with each other by touch, a voltage V a Y+capacitor charging time measuring unit which obtains a charge time taken until a charging level given as V a Y− capacitor charging time measuring unit which obtains a charge time taken until a charging level given as V a Y+ equal resistance line operating unit which obtains an equal resistance line based on a value of (R a Y− equal resistance line operating unit which obtains an equal resistance line based on a value of (R a touch coordinate calculating unit which searches for a point of intersection between the equal resistance line based on the value of (R