Korea Advanced Institute of Science and Technology

Min-Ho Seo

Jun-Bo Yoon

Jaeyoung Yoo

Jae-young Yoo

A touch input device which detects a touch position and a touch pressure magnitude may be provided that includes: a display module; a first electrode and a second electrode which are disposed on the display module and are spaced apart from each other; a spacer layer which is formed on the display module and covers the first electrode and the second electrode; and a transparent ground electrode which is disposed on the spacer layer and is formed of a material having transparency. A distance between the transparent ground electrode and the display module is changed by inputting a touch on the transparent ground electrode, and a capacitance between the first electrode and the second electrode is changed by the distance change. The position of the touch and the pressure magnitude of the touch are detected based on the changed capacitance.

Touch input device

A pressure sensor includes a substrate whose top surface is formed in the form of a projection, a first electrode formed on one side of the top surface of the substrate, a second electrode formed on the other side of the top surface and spaced apart from the first electrode; and a dielectric material layer formed on the top surface of the substrate and fills a space between the first electrode and the second electrode. A pressure applied in a direction perpendicular to the top surface of the substrate causes a change in the dielectric constant of the dielectric material layer. The magnitude of the pressure is sensed by detecting a capacitance which changes according to the change in the dielectric constant. The projection forms a stress concentration structure, through which the dielectric constant change amount according to the pressure becomes larger, thereby improving sensitivity of the pressure sensor.

Growing community of inventors

Daejeon, South Korea

Min-Ho Seo