Patent Number: 6,310,614

Title: Touch-panel input device

Abstract: Two transparent conductive panels are separated by a perimeter of elastic adhesive that forms a sealed gap in which transparent insulative fluid is interposed. The fluid has suspended conductive particles and a refraction index close to that of the panels to improve light transmittance through the device. The conductive particles and small gap width improves response time and prevents formation of a vacuum in the gap. The panels are connected to a position detection circuit that determines coordinate position of an applied pressure point. Spacers in the gap reduce the chance of response to accidental large-area contact which would result in an erroneous position command. The elasticity of the adhesive and the small gap width provide better temperature variation tolerance in addition to improved consistency and reliability of operation.

Inventors: Maeda; Toshifumi (Toyama-Ken, JP), Tanaka; Hiroshi (Toyama-Ken, JP)

Assignee: SMK Corporation

International Classification: G06F 3/033 (20060101); G09G 005/00 ()

Expiration Date: 10/30/2018