A Novel Touch Interface with Ultrahigh Optical Transmittance Based on Electrical Impedance Tomography for Interactive Displays

Abstract In traditional touch interfaces, electrodes will block the light intensity of the display, so extra power is required to maintain the display performance. In this article, an eight‐electrode electrical impedance tomography system for touch location detection is proposed to improve the transmittance. The electrodes are settled at the edge of the touch panel and a machine learning algorithm is used to perform the regression process. This system can achieve almost 1 mm mean absolute error in X‐ and Y‐directions on a 30 × 30 mm² 2D surface and guarantee nearly 94% light transmittance. The results from experiments show the feasibility of the new structure for high optical transmittance interactive display in the future.