Display device including touch panel device, and coupling-noise eliminating method

Abstract

A display device includes; a touch panel device including; a touch panel and a touch controller connected to the touch panel, the touch controller including; a sampling unit which samples a sensing output signal input thereto from the touch panel to generate a sampled signal, and an analog / digital converter which converts the sampled signal to generate contact information, and a display panel device including; a display panel, a gate driver which applies a gate signal to the display panel, and a data driver which applies a data voltage to the display panel, wherein the sampling unit samples a portion of the sensing output signal which does not include a coupling noise.

Description

[0001]This application claims priority to Korean Patent Application No. 10-2009-0084546, filed on Sep. 8, 2009, and all the benefits accruing therefrom under 35 U.S.C. §119, the content of which in its entirety is herein incorporated by reference.BACKGROUND OF THE INVENTION[0002](a) Field of the Invention[0003]The present invention relates to a display device including a touch panel device, and a method for eliminating a coupling noise between the display device and the touch panel device.[0004](b) Description of the Related Art[0005]A display device of a liquid crystal display (“LCD”) and an organic light emitting device (“OLED”), a portable transmitting device, and other types of information processing devices execute a function thereof using various input devices, e.g., keyboards, mice, etc. Recently, the use of touch panels as an input device has increased.[0006]The typical touch panel is a device for allowing a machine such as a computer to perform a desired command by writing ...

AI Technical Summary

Benefits of technology

The present invention relates to a display device that eliminates coupling noise from a touch panel device. The invention includes a touch panel and a touch controller. The touch controller includes a sampling unit that samples the sensing output signal from the touch panel and an A / D converter that converts the sampled signal to generate contact information. The sampling unit samples the sensing output signal for a portion of the sensing output signal that does not include coupling noise. The invention also includes a noise removing unit that removes the coupling noise from the sensing output signal by subtracting a reference noise signal from the sensing output signal. The invention improves the accuracy of touch panel devices and enhances the quality of display devices.

Problems solved by technology

The resistive type of touch panel may be operated regardless of the conductivity of the contact matter, however when several positions are simultaneously touched, the values of the changed voltages are recognized jointly as one contact such that it is difficult to obtain simultaneous touch information from the several positions.

This capacitance type touch panel may determine the contact existence and the contact position even if various positions are simultaneously contacted, however the voltage change is not generated when an insulator, such as gloves or other non-conductive surface, contact the touch panel such that the contact information may not be obtained.

Signals applied to the display panel, and especially signals having relatively large widths such as the gate signal, influence a sensing output signal of both the embedded and external touch panel, thereby generating unwanted coupling noise which deteriorates the quality of the associated display.

Images