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

[0012]The present invention eliminates coupling noise included in a sensing output signal of a touch panel device.

[0034]Another exemplary embodiment of a method for eliminating a coupling noise of a display device according to the present invention, display device including a touch panel device including a touch panel and a touch controller, and a display panel device including a display panel, a gate driver applying a gate signal to the display panel, and a data driver applying a data voltage to the display panel includes; receiving a sensing output signal including a coupling noise, and a reference noise signal from the touch panel; generating a noise-free sensing output signal by subtracting the reference noise signal from the sensing output signal to remove the coupling noise from the sensing output signal; sampling the noise-free sensing output signal to generate a sampled signal; and converting the sampled signal to generate contact information.

[0038]Another exemplary embodiment of a method for eliminating a coupling noise of a display device according to the present invention, the display device including a touch panel device including a touch panel and a touch controller, and a display panel device including a display panel, a gate driver applying a gate signal to the display panel, and a data driver applying a data voltage to the display panel, includes; inputting to the touch panel a sensing input signal and an inversion sensing input signal that is an inverted signal of the sensing input signal; receiving a sensing output signal corresponding to the sensing input signal and an inversion sensing output signal corresponding to the inversion sensing input signal from the touch panel; generating a noise-free sensing output signal by subtracting the inversion sensing output signal from the sensing output signal and dividing the subtraction result in half; sampling the noise-free sensing output signal to generate a sampled signal; and converting the sampled signal to generate contact information.

[0041]According to the present exemplary embodiments, when the touch panel is attached to the display panel or is embodied inside the display panel, the coupling noise of the gate signal may be removed such that an error generated by the coupling noise of the contact information may be prevented. Also, touch accuracy of the display device requiring minute touch resolution may be improved.

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.

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