TOUCH CELL STRUCTURE OF A TOUCH PANEL AND THE TOUCH PANEL USING THE SAME

• US 20150331520A1
• Filed: 07/28/2015
• Published: 11/19/2015
• Est. Priority Date: 12/17/2009
• Status: Active Grant

• Current Assignee: G2touch Co Ltd
• Original Assignee: Sung Ho Lee
• Inventors: LEE, Sung Ho
• Granted Patent: US 9,836,169 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

Provided is a touch cell structure for a touch panel in which a touch cell is configured into a new pad to gate mode in order to solve a problem of a conventional capacitive-type touch input device. The touch cell structure includes: a conductive pad that forms an electrostatic capacitance with respect to a touch unit when a finger of a human body or the touch unit having an electrical characteristic similar to the finger approaches the conductive pad within a predetermined distance; and a three-terminal type switching device whose gate terminal is connected with the conductive pad and whose output signal is changed in correspondence to a change in electric potential of the gate terminal of the three-terminal type switching device by the electrostatic capacitance between the touch unit and the conductive pad. Since the potential of the gate terminal of the switching device is determined by an electrostatic capacitance formed in the conductive pad, a difference of the output signal output from the switching device becomes large depending on whether a touch input occurs or not.

Claims

1. A touch panel comprising:

touch cells that are arranged in a matrix form on the light transmissive substrate, in which each touch cell comprises a conductive pad, and a three-terminal type switching device whose gate terminal is connected with the conductive pad and whose output signal is changed in correspondence to a change in electric potential of the gate terminal of the three-terminal type switching device by an electrostatic capacitance between a finger of a human body or a touch unit having an electrical characteristic similar to the finger and the conductive pad; and

capacitors that are connected between the control terminal and the output terminal of the three-terminal type switching unit.