LightTouch Gadgets: Extending Interactions on Capacitive Touchscreens by Converting Light Emission to Touch Inputs


We present LightTouch, a 3D-printed passive gadget to enhance touch interactions on unmodified capacitive touchscreens. The LightTouch gadgets simulate finger operations such as tapping, swiping, and multi-touch gestures by means of conductive materials and light-dependent resistors (LDR) embedded in the object. The touchscreen emits visible light and the LDR senses the level of this light, which changes its resistance value. By controlling the screen brightness, it intentionally connects or disconnects the path between the GND and the touchscreen, thus allowing the touch inputs to be controlled. In contrast to conventional physical extensions for touchscreens, our technique requires neither continuous finger contact on the conductive part nor the use of batteries. As such, it opens up new possibilities for touchscreen interactions beyond the simple automation of touch inputs, such as establishing a communication channel between devices, enhancing the trackability of tangibles, and inter-application operations.

Kaori Ikematsu
Yahoo Japan Corporation, Tokyo, Japan
Kunihiro Kato
Tokyo University of Technology, Tokyo, Japan
Yoshihiro Kawahara
The University of Tokyo, Tokyo, Japan




会議: CHI 2021

The ACM CHI Conference on Human Factors in Computing Systems (

セッション: Wearables, Tangibles, and Fabrics

[C] Paper Room 10, 2021-05-11 09:00:00~2021-05-11 11:00:00 / [A] Paper Room 10, 2021-05-10 17:00:00~2021-05-10 19:00:00 / [B] Paper Room 10, 2021-05-11 01:00:00~2021-05-11 03:00:00
Paper Room 10
14 件の発表
2021-05-11 09:00:00
2021-05-11 11:00:00