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

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Title: 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. ...


Browse recent Samsung Electronics Co., Ltd. patents - Suwon-si, KR
Inventors: Nam-Hee GOO, Bo-Ram KIM, Myoung-Chul KIM, Byoung-Jun LEE, Yun-Jae KIM
USPTO Applicaton #: #20110057890 - Class: 345173 (USPTO) - 03/10/11 - Class 345 


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The Patent Description & Claims data below is from USPTO Patent Application 20110057890, Display device including touch panel device, and coupling-noise eliminating method.

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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

(a) Field of the Invention

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.

(b) Description of the Related Art

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.

The typical touch panel is a device for allowing a machine such as a computer to perform a desired command by writing a character, drawing a picture, or executing an icon through touching a finger or a touch pen (such as a stylus) on a screen. A display device to which the touch panel is attached can determine whether the finger of a user or a touch pen, etc., touches a screen, and touch position information thereof (the touch determination, i.e., the determination of whether a touch event occurred, and the positional information regarding the touch event may collectively be referred to as a “touch input”). The display device may then display images according to the position of the touch input.

These touch panels are typically classified as a resistive type, a capacitive type and an electro-magnetic (“EM”) type according to the method by which the touch is sensed.

Among the various types of touch panels, the resistive type of touch panel typically includes upper and lower transparent electrodes separated from each other by a spacer. If an upper plate formed with the upper transparent electrode is depressed by external contact such that the upper transparent electrode and the lower transparent electrode physically contact each other, the contact and the position of the contact may be determined by measuring a voltage change according to the resistance of the depressed position. 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.

The capacitance type of touch panel typically includes a film formed with a transparent electrode, and touch determination and touch positions may be determined by measuring a voltage change of the conductive matter by the user contact after applying a voltage to the transparent electrode. The user contact in this type of touch panel is typically supplied by the finger of the user. 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.

The touch panel may be further classified into an external type in which the touch panel is attached to an outside of the display device and an embedded type in which the touch panel is located inside the display device itself.

A display panel of the display device may include a plurality of switching elements for switching a data voltage, and a plurality of signal lines, such as gate lines and data lines, for applying the data voltage to a plurality of pixels by controlling the switching elements. The gate lines transmit a gate signal including a gate-on voltage Von and a gate-off voltage Voff. 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.

BRIEF

SUMMARY

OF THE INVENTION

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

An exemplary embodiment of a display device according to a the present invention includes; a touch panel device including a touch panel and a touch controller; 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 touch controller includes a sampling unit that samples a sensing output signal inputted from the touch panel to generate a sampled signal and an analog/digital (“A/D”) converter which converts the sampled signal to generate contact information, and the sampling unit samples for a portion of the sensing output signal which does not include a coupling noise.

In one exemplary embodiment, the coupling noise may be in synchronization with at least one of a clock signal which generates the gate signal and the gate signal.

In one exemplary embodiment, the sampling unit may sample the sensing output signal by using a sampling enable signal, and the sampling enable signal may include a first voltage corresponding to a coupling noise of the sensing output signal, and a second voltage corresponding to a portion without the coupling noise.

In one exemplary embodiment, the display panel device may further include a signal controller for controlling the gate driver and the data driver, and the sampling enable signal may be generated in the signal controller by using at least one of a clock signal which generates the gate signal and the gate signal.

In one exemplary embodiment, the touch controller may further include a signal generator receiving at least one of a clock signal which generates the gate signal and the gate signal and generates the sampling enable signal.

In one exemplary embodiment, the touch controller may further include a register for storing sampling time information as information for a time that the sensing output signal is sampled, and the sampling unit may execute the sampling for the portion of the sensing output signal without the coupling noise by using the sampling time information.

In one exemplary embodiment, the sampling time information may be generated by synchronizing at least one of a clock signal which generates the gate signal and the gate signal with the sensing output signal, and a period of the sensing output signal may be an integer multiple of 1 horizontal period 1H.

Another exemplary embodiment of a display device according to the present invention includes: a touch panel device including a touch panel and a touch controller; 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 touch controller includes a noise removing unit for removing a coupling noise from the sensing output signal inputted from the touch panel and for outputting a noise-free sensing output signal, a sampling unit for sampling the noise-free sensing output signal to generate a sampled signal, and an A/D converter which converts the sampled signal to generate contact information, and the noise removing unit further receives a reference noise signal from the touch panel and generates the noise-free sensing output signal by subtracting the reference noise signal from the sensing output signal.

In one exemplary embodiment, the coupling noise may be in synchronization with at least one of a clock signal which generates the gate signal and the gate signal, and the reference noise signal may include a reference voltage including 0V and the coupling noise.

In one exemplary embodiment, the touch panel may face the display panel, the touch panel may include a touch region for sensing a touch and a reference noise extracting region electrically separated from the touch region, the touch region may include a first electrode for outputting the sensing output signal, and the reference noise extracting region may include a second electrode for receiving a reference voltage including 0V and for outputting the reference noise signal to the touch controller.

In one exemplary embodiment, the touch region may include a plurality of x-axis electrodes and a plurality of y-axis electrodes insulated from and disposed substantially perpendicular to the x-axis electrodes, the sensing output signal may be output from a first x-axis electrode and a first y-axis electrode that correspond to a touch point of the touch panel among the plurality of x-axis electrodes and the plurality of y-axis electrodes, and the reference noise signal may be output from at least one of the plurality of x-axis electrodes except the first x-axis electrode and at least one of the plurality of y-axis electrodes except the first y-axis electrode.

Another exemplary embodiment of a display device according to the present invention includes 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. The touch controller inputs a sensing input signal and an inversion sensing input signal that is an inverted signal of the sensing input signal to the touch panel, and receives 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. The touch controller includes a noise removing unit for removing a coupling noise from the sensing output signal to generate a noise-free sensing output signal, a sampling unit for sampling the noise-free sensing output signal to generate a sampled signal, and an A/D converter which converts the sampled signal to generate contact information. The noise removing unit generates the noise-free sensing output signal by subtracting the inversion sensing output signal from the sensing output signal and dividing the subtraction result in half.

Another exemplary embodiment of a display device according to the present invention includes a touch panel device including a touch panel and a touch controller, 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. The touch controller includes a sampling unit for sampling a sensing output signal inputted from the touch panel to generate a sampled signal, a filter which generates a coupling noise removed signal by removing a coupling noise from the sampled signal, and an A/D converter which converts the coupling noise removed signal to generate contact information.

In one exemplary embodiment, the sampled signal may include a plurality of extracted data in series, the filter may compare the plurality of extracted data with each other, and the filter may compare a value of a first data of the plurality of extracted data with a value of previous data of the first data and a value of next data of the first data among the plurality of extracted data, and may remove the first data from the plurality of extracted data when a difference between the value of the first data and the value of the previous data or a difference between the value of the first data and the value of the next data is equal to or more than a predetermined value.



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Computer graphics processing, operator interface processing, and selective visual display systems
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stats Patent Info
Application #
US 20110057890 A1
Publish Date
03/10/2011
Document #
12755660
File Date
04/07/2010
USPTO Class
345173
Other USPTO Classes
International Class
06F3/041
Drawings
15



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