An electronic device (101, 500) comprising: a first conductive layer; a second conductive layer formed to be opposite to the first conductive layer, and including a plurality of conductors (521,522,523,524) electrically separated, and one or more photo-conductive members (531,532,533) positioned to be connected between the plurality of conductors; an insulating layer interposed between the first conductive layer and the second conductive layer; one or more light sources (541,542,543) positioned to face the one or more photo-conductive members; and a control circuit, wherein the control circuit is configured to: output a specified light through at least one light source of the one or more light sources (541,542,543) such that at least one photo-conductive member, an electric conductivity (C1,C2,C3,C4) of which increases in response to a light, from among the one or more photo-conductive members (531, 532, 533) and at least some conductors electrically connected with the at least one photo-conductive member from among the plurality of conductors (521, 522, 523,524) are connected and a capacitance value between the first conductive layer and the second conductive layer is changed, wherein the plurality of conductors (521,522,523,524) are separated from each other and are in contact with one surface of the insulating layer. a first conductive layer; a second conductive layer formed to be opposite to the first conductive layer, and including a plurality of conductors (521,522,523,524) electrically separated, and one or more photo-conductive members (531,532,533) positioned to be connected between the plurality of conductors; an insulating layer interposed between the first conductive layer and the second conductive layer; one or more light sources (541,542,543) positioned to face the one or more photo-conductive members; and a control circuit, wherein the control circuit is configured to: output a specified light through at least one light source of the one or more light sources (541,542,543) such that at least one photo-conductive member, an electric conductivity (C1,C2,C3,C4) of which increases in response to a light, from among the one or more photo-conductive members (531, 532, 533) and at least some conductors electrically connected with the at least one photo-conductive member from among the plurality of conductors (521, 522, 523,524) are connected and a capacitance value between the first conductive layer and the second conductive layer is changed, wherein the plurality of conductors (521,522,523,524) are separated from each other and are in contact with one surface of the insulating layer. output a specified light through at least one light source of the one or more light sources (541,542,543) such that at least one photo-conductive member, an electric conductivity (C1,C2,C3,C4) of which increases in response to a light, from among the one or more photo-conductive members (531, 532, 533) and at least some conductors electrically connected with the at least one photo-conductive member from among the plurality of conductors (521, 522, 523,524) are connected and a capacitance value between the first conductive layer and the second conductive layer is changed, wherein the plurality of conductors (521,522,523,524) are separated from each other and are in contact with one surface of the insulating layer.