Patent ID: 8102379

Claim:
A touch sensing device, comprising: a first substrate layer comprising a first dielectric layer and a first conductive layer; a second substrate layer comprising a second dielectric layer and a second conductive layer, wherein a containing space is defined by the first substrate layer and the second substrate layer for containing a fluid, and the fluid contacting the first dielectric layer and/or the second dielectric layer; a driver for providing at least one first charge to the first conductive layer, at least one second charge to the second conductive layer, and at least one third charge to the fluid, wherein the polarity of the first charge is the same with that of the second charge but different from that of the third charge; and a sensor comprising at least one sensing unit configured in the containing space, for sensing an electric characteristic of the fluid; wherein the first charges, the second charges, and the third charges determine a geometric appearance of the fluid; wherein when a point unit with at least one fourth charge approaches the first substrate layer and the distance between the point unit and the first substrate is smaller than a threshold, the fourth charges influencing the first charges, so as to change the geometric appearance of the fluid and then change the electric characteristic of the fluid.