KR20120015219A - Semiconductor sensing device, driving method of sensing device and display device including the same - Google Patents

Abstract

PURPOSE: A semiconductor sensing device, an operating method thereof, and a display device including the same are provided to reduce manufacturing costs by embedding a capacitive touch unit inside a display panel. CONSTITUTION: A power unit(10) generates a gate-on voltage and a gate-off voltage. The generated voltages are supplied to a gate driving unit(20). The power unit supplies a reference gamma voltage to a data driving unit(30). The gate driving unit supplies the driving signal to a gate line of a display panel(50).

Description

Semiconductor sensing device, driving method thereof, and display device including same {SEMICONDUCTOR SENSING DEVICE, DRIVING METHOD OF SENSING DEVICE AND DISPLAY DEVICE INCLUDING THE SAME}

The present invention relates to a semiconductor sensing device, a driving method thereof, and a display device including the same.

In recent years, the display field for visually expressing electrical information signals has been rapidly developed as the information age has entered. In response to this, various flat display devices have been developed that have excellent performance of thinning, light weight, and low power consumption, and are rapidly replacing the existing cathode ray tube (CRT).

Specific examples of such a flat panel display device include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an electroluminescent display device. (Electro luminescence Display Device (ELD), Organic Light Emission Display Device (OLED)) and the like, these are commonly provided with a flat panel display panel for realizing an image.

Recently, a flat panel display device used for a mobile communication terminal, a television, a computer monitor, an ATM, and the like has been developed to improve user convenience using a touch sensor.

Conventional touch sensors are manufactured by using a separate panel and attaching the upper surface of the flat panel display panel. In this case, since the touch panel must be manufactured separately, the price of the product is increasing.

In order to improve such a problem, a touch panel integrated display panel having a touch panel embedded therein has been developed. However, since a resistive film is used, defects such as pixel damage and signal line breakage occur when the touch occurs. There is this.

SUMMARY The present invention has been made in an effort to provide a semiconductor sensing device including a capacitive touch unit in a display panel, a driving method thereof, and a display device including the same.

SUMMARY An object of the present invention is to provide a semiconductor sensing device capable of implementing multi-touch, a driving method thereof, and a display device including the same.

According to an aspect of the present invention, a first capacitor for charging a touch reference voltage, a first switch device connected to the first capacitor and charging the touch reference voltage input from the power supply to the first capacitor, the first capacitor and A touch sensor driver connected to the first switch element and having a second switch element discharging a voltage charged in the first capacitor; And a third switch element formed on the display panel displaying an image, the third switch element connected to the second switch element, the second capacitor connected to the third switch element, and the voltage discharged from the first capacitor being charged. According to an embodiment, there is provided a sensing device including a touch unit having a touch electrode connected to an element to form a third capacitor during touch sensing.

The touch sensor driver may further include a potential measuring unit measuring a potential of the voltage charged in the first capacitor.

The touch unit may include a scan line connected to a gate electrode of the third switch element; And a sensing line connected to the second switch element and the third switch element, wherein the scan line and the sensing line cross each other.

The touch sensor driver may sequentially transmit scan signals for driving the third switch elements connected to the scan lines to the scan lines.

The touch sensor driver supplies a scan signal to the scan line while displaying an image of one frame on the display panel, and simultaneously supplies the scan signal to the scan line to charge the second capacitor when the next frame starts. The voltage can be discharged.

In the sensing device, the first switch element and the second switch element may be alternately turned on / off.

The first switch device charges the touch reference voltage to the first capacitor when turned on, and the second switch device discharges the voltage charged to the first capacitor when turned on to charge the second capacitor. The voltage charged in one capacitor and the voltage charged in the second capacitor may be the same.

The sensing device may share the voltages charged in the first capacitor, the second capacitor, and the third capacitor when the touch is generated.

The third switch element may be formed of a thin film transistor.

The touch electrode may be formed to overlap with the pixel electrode formed on the display panel, and the plurality of pixel electrodes may overlap with the touch electrode.

According to another aspect of the invention, the step of transmitting a first switch control signal for turning on the first switch element to charge the first capacitor to the touch reference voltage input from the power supply; Transmitting a second switch control signal for turning on the second switch element to discharge a voltage charged in the first switch element to charge the second capacitor formed in the touch unit; Discharging a voltage charged in the first capacitor and the second capacitor to a third capacitor formed during touch sensing to equalize the voltage charged in the first to third capacitors; And calculating a touch position by measuring a potential of the voltage charged in the first capacitor.

The driving method of the sensing device may further include sequentially supplying a scan signal to a plurality of third switch elements connected to the plurality of scan lines formed on the touch unit.

The method of driving the sensing device sequentially supplies the scan signals to the plurality of scan lines while displaying an image of one frame, and then simultaneously supplies the scan signals to the plurality of scan lines when the next frame starts. The method may further include discharging the voltage charged in the second capacitor.

In the method of driving the sensing device, the first switch control signal and the second switch control signal may be alternately supplied to each other so that the second switch element is turned off when the first switch element is turned on.

According to another aspect of the invention, a display panel for displaying an image; A gate driver and a data driver to drive the display panel; A timing controller supplying a pixel voltage to the data driver; A power supply unit supplying power to the gate driver and the data driver; And a first capacitor charging the touch reference voltage supplied from the power supply unit, a first switch element connected to the first capacitor, and charging the first capacitor with the touch reference voltage input from the power supply unit, the first capacitor and the first capacitor. A touch sensor driver connected to a first switch element and having a second switch element discharging a voltage charged in the first capacitor, a third switch element formed on the display panel and connected to the second switch element; A sensing device having a touch unit having a second capacitor connected to a third switch element and charged with a voltage discharged from the first capacitor, and a touch electrode connected to the third switch element to form a third capacitor upon touch sensing; A display device may be provided.

The timing controller may provide a frame start signal to the touch sensor driver.

The touch sensor driver may sense a touch by measuring a voltage charged in the first capacitor.

The display device may include: a scan line formed on the display panel and connected to a gate electrode of the third switch element; The display device may further include a sensing line connected to the touch sensor driver and formed to cross the scan line.

The display panel may include a gate line connected to the gate driver; A data line connected to the data driver and intersecting the gate line; The display device may further include at least one thin film transistor connected to the gate line and the data line, wherein the scan line is insulated from the gate line, and the sensing line is insulated from the data line.

The third switch element may be manufactured in the same process as the thin film transistor.

The display panel may be a liquid crystal display panel or an organic light emitting display panel.

According to the exemplary embodiment of the present invention, since the touch panel is formed in the display panel during the display panel manufacturing process by embedding the electrostatic touch unit in the display panel, manufacturing cost can be reduced.

In addition, according to an embodiment of the present invention, the touch sensor may be implemented in an active matrix manner to implement a multi-touch for simultaneously detecting a plurality of touches.

1 is a block diagram schematically illustrating a display device having a sensing device according to an exemplary embodiment of the present invention.
2 is a circuit diagram illustrating a touch sensor according to an embodiment of the present invention.
FIG. 3 is a timing diagram illustrating a scan signal and a sensing signal supplied to the touch unit illustrated in FIG. 2.
4 is a view illustrating a touch unit of a touch sensor according to an embodiment of the present invention.
FIG. 5 is a schematic circuit diagram illustrating that the display panel shown in FIG. 1 is a liquid crystal display panel. FIG.
FIG. 6 is a schematic circuit diagram illustrating that the display panel illustrated in FIG. 1 is an organic light emitting display panel.
FIG. 7 is a schematic cross-sectional view for describing the second capacitor and the third capacitor shown in FIG. 2. FIG.
FIG. 8 is a timing diagram of control signals supplied to the first switch element and the second switch element shown in FIG. 2; FIG.

The present invention may be variously modified and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, numerals (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

Hereinafter, a semiconductor sensing apparatus, a driving method thereof, and a display device including the same according to exemplary embodiments will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically illustrating a display device with a sensing device according to an exemplary embodiment.

Before describing FIG. 1, in the display device according to the exemplary embodiment, the display panel 50 may be a liquid crystal display panel or an organic light emitting display panel. In this case, the touch unit 100 is formed inside the display panel 50 and is integrally formed on the display panel without an additional device or an additional panel. In addition, although the sensing device according to an exemplary embodiment of the present disclosure describes a touch sensor built in the display panel, the present invention is not limited thereto.

Referring to FIG. 1, a display device with a touch sensor according to an exemplary embodiment may include a power supply unit 10, a gate driver 20, a data driver 30, a timing controller 40, a display panel 50, and a touch. The unit 100 and the touch sensor driver 200 may be included.

In detail, the power supply unit 10 generates the gate on (Von) and gate off (Voff) voltages and supplies them to the gate driver 20. The power supply unit 10 generates a reference gamma voltage VD and supplies it to the data driver 30. The power supply unit 10 may generate and supply a driving voltage when the display panel 50 is an organic light emitting display panel.

The power supply unit 10 may generate a touch reference voltage Vref and supply the touch reference voltage Vref to the touch sensor driver 200 or the touch unit 100.

The power supply unit 10 may generate and supply voltages for driving the respective driving units in addition to the voltages described above.

In addition, when the display panel 50 is a liquid crystal display panel, the power supply unit 10 may generate and supply a voltage supplied to a backlight for supplying light to the liquid crystal display panel.

The gate driver 20 supplies a driving signal to the gate line of the display panel 50. The gate driver 20 gates the gate lines of the display panel 50 using the gate on / off voltage Von / Voff supplied from the power supply unit 10 and the gate control signal supplied from the timing controller 40. The on / off voltage (Von / Voff) is sequentially supplied.

The data driver 30 supplies a driving signal to the data line of the display panel 50. The data driver 30 supplies the data voltage to the data lines of the display panel 50 using the gamma voltage supplied from the power supply unit 10, the data signal supplied from the timing controller 40, and the data control signal.

The timing controller 40 generates a gate control signal and a data control signal and supplies them to the gate driver 20 and the data driver 30, respectively. The timing controller 40 converts the red, green, and blue image signals input from the outside into pixel data signals corresponding to each pixel of the display panel 50 and supplies them to the data driver 30.

The display panel 50 displays an image. The display panel 50 may be a liquid crystal display panel or an organic light emitting display panel. The display panel 50 may include a plurality of pixels. Each pixel is formed by crossing a gate line and a data line, and a liquid crystal or an organic light emitting body may be formed for each pixel. The display panel 50 will be described in detail with reference to FIGS. 2 and 3.

According to the display device of the present invention, it may include a touch sensor device including a touch unit 100 and a touch sensor driver 200 for supplying a driving signal to the touch unit 100.

As illustrated in FIG. 2, the touch sensor driver 200 may include a first switch element 110, a second switch element 120, and a first capacitor C1. In addition, the touch sensor driver 200 may further include a potential measuring element measuring a potential of the first capacitor C1.

The touch sensor driver 200 may supply a scanning signal to the scan line SL formed in the touch unit 100. As illustrated in FIG. 3, the touch sensor driver 200 may sequentially turn on the third switch device 130 by sequentially supplying turn-on signals for each scan line SL.

The touch sensor driver 200 sequentially turns on the third switch element 130 connected to the scan lines SL by sequentially supplying turn-on signals to the plurality of scan lines SL during one frame.

In this case, when the first frame operation is completed, the touch sensor driver 200 transmits a turn-on signal to all scan lines SL to discharge the charge charged in the second capacitor C2 for the next operation.

The touch unit 100 may be integrally formed on the display panel 50. In particular, the touch unit 100 may be formed in the display area of the display panel 50. As illustrated in FIG. 4, the touch unit 100 may include a second capacitor C2 scan line SL, a sensing line CL, a third switch element 130, and a touch electrode 160. .

The scan line SL and the sensing line CL may be formed to cross each other. The third switch element 130 may be formed at each intersection of the scan line SL and the sensing line CL and may be formed in any one pixel of the display panel 50. The touch electrode 160 may be formed to be connected to the third switch element 130 in an area where the scan line SL and the sensing line CL cross each other.

In this case, the touch electrode 160 may be formed to overlap the plurality of pixels of the display panel 50. One touch electrode 160 may vary depending on the resolution of the display panel 50, but may be formed to overlap with tens to thousands of pixels.

Hereinafter, a detailed structure and operation of the touch sensor will be described later.

In an embodiment of the present disclosure, any one of the gate driver 20, the data driver 30, and the touch sensor driver 200 may be integrated in the display panel 50.

FIG. 5 is a diagram for explaining, for example, that a display panel is a liquid crystal display panel in the display device of the present invention.

FIG. 5 is a diagram illustrating one pixel of an active matrix type liquid crystal display panel, for example. The liquid crystal display panel converts the pixel data signal into an analog data voltage based on the gamma reference voltage and supplies it to the data line DL, and simultaneously supplies a scan pulse to the gate line GL, and supplies the data voltage to the liquid crystal cell Clc. Charge it. For this purpose, the gate electrode of the TFT is connected to the gate line GL, and the source electrode is connected to the data line DL. The drain electrode of the TFT is connected to the pixel electrode of the liquid crystal cell Clc and one electrode of the storage capacitor Cst. The common voltage Vcom is supplied to the common electrode of the liquid crystal cell Clc. The storage capacitor Cst charges a data voltage applied from the data line DL when the thin film transistor TFT is turned on to maintain a constant voltage of the liquid crystal cell Clc. When the scan pulse is applied to the gate line GL, the TFT is turned on to form a channel between the source electrode and the drain electrode so that the voltage on the data line DL is applied to the pixel electrode of the liquid crystal cell Clc. Supply. In this case, the liquid crystal molecules of the liquid crystal cell Clc modulate incident light by changing an arrangement by an electric field between the pixel electrode and the common electrode.

An image is displayed by using a backlight generated from the backlight unit disposed on the rear surface of the liquid crystal display panel.

The touch unit 100 illustrated in FIG. 1 may be formed in the liquid crystal display panel. The touch unit 100 may be formed in the display area of the liquid crystal display panel, and may be manufactured in the same process during the thin film transistor array process of the liquid crystal display panel.

That is, in the touch unit 100, the third switch element 130 of the touch unit may be formed in a predetermined region in the same process while the TFTs of the liquid crystal display panel are manufactured. In this case, the third switch element 130 may be formed only in some pixels instead of all pixels.

In addition, the scan line SL may be formed in the same plane and the same process as the gate line GL of the liquid crystal display panel, and the sensing line CL may be formed in the same plane and the same process as the data line DL.

The touch electrode 160 may be formed above or below the pixel electrode. In this case, the touch electrode 160 may be formed to overlap the plurality of pixel electrodes. That is, one touch electrode 160 and one third switch element 130 connected to the touch electrode 160 may be formed per plurality of liquid crystal cells Clc. The touch electrode 160 may be formed of the same material as the pixel electrode, that is, a transparent electrode.

The touch electrode 160 may form the third capacitor C3 when an external touch occurs.

6 is a diagram illustrating a circuit diagram of an organic light emitting display panel.

Referring to FIG. 6, the organic light emitting display panel includes a plurality of gate lines GL, a data line DL, a current supply line PL, a first transistor TFT1, a second transistor TFT2, and a storage capacitor Cst. ) And an organic light emitting diode (LD).

In this case, the organic light emitting display panel is configured to control the data voltage supplied to the organic light emitting diode LD, the first and second transistors TFT1 and TFT2 and the first transistor TFT1 that control the organic light emitting diode LD formed on the substrate. It includes a storage capacitor (Cst) to charge.

The gate line GL supplies the scan signal supplied from the gate driver 20 shown in FIG. 1 to the pixel cell. In particular, the gate line GL is connected to the gate electrode of the first transistor TFT1 included in the pixel cell to turn on the first transistor TFT1.

The data line DL is formed to cross the gate line GL to supply the data voltage supplied from the data driver 30 shown in FIG. 1 to the first transistor TFT1.

When the scan signal is supplied to the gate line GL, the first transistor TFT1 is turned on to supply a data voltage supplied from the data line DL. The storage capacitor Cst charges the supplied data voltage. Here, when the first transistor TFT1 is turned off, the data voltage charged in the storage capacitor Cst is supplied to the gate electrode of the second transistor TFT2 to turn on the second transistor TFT2. The second transistor TFT2 is turned on until all of the data voltages charged in the storage capacitor Cst are discharged to supply the power signal supplied from the current supply line PL to the organic light emitting diode LD. The first and second transistors TFT1 and TFT2 may be formed of NMOS or PMOS.

The organic light emitting diode LD is formed between an anode electrode formed of an opaque conductive material such as a metal on one of the substrates of the organic light emitting display panel 50, and a cathode electrode formed of a transparent conductive material facing the anode electrode. An organic light emitting layer is formed of a blue light emitting material. The organic light emitting layer is formed by sequentially stacking a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer and an electron injection layer from a layer in contact with the anode electrode. The organic light emitting diode (LD) formed as described above supplies electrons to the light emitting layer through the electron injection layer and the electron transporting layer from the cathode electrode, and supplies holes to the light emitting layer through the hole injection layer and the hole transporting layer from the anode electrode. Recombination produces light. In this case, the anode electrode is connected to the output terminal of the second transistor TFT2, and the cathode electrode is supplied to the ground signal VSS or the power signal VSS terminal lower than the voltage supplied to the anode electrode. Here, the organic light emitting diode LD is a current controlled by the second transistor TFT2 by a voltage difference between the gate electrode and the source electrode of the second transistor TFT2 according to the data voltage supplied from the first transistor TFT1. Driven by (I).

Here, the touch unit 100 illustrated in FIG. 1 may be formed in the display area of the organic light emitting display panel. The touch unit 100 may be formed in the light emitting direction of the organic light emitting display panel.

The touch unit 100 may be manufactured in the same process on the same substrate in the substrate manufacturing process of the organic light emitting display panel.

In the touch unit 100, the third switch element 130 of the touch unit 100 may be formed in the same process in a predetermined area while the first and second transistors TFT1 and TFT2 of the organic light emitting display panel are manufactured. have. In this case, the third switch element 130 may be formed only in some pixels instead of all pixels.

In addition, the scan line SL may be formed in the same plane and the same process as the gate line GL of the organic light emitting display panel, and the sensing line CL may be formed in the same plane and the same process as the data line DL. .

The touch electrode 160 may be formed on the top or bottom surface of the organic light emitting diode LD.

As illustrated in FIGS. 5 and 6, the touch unit 100 may be integrally formed on the display panel 50 to reduce manufacturing time and cost of the touch sensor.

Hereinafter, a touch sensor according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 8.

2 and 4, the touch sensor according to the embodiment of the present invention includes a first switch element 110 and a second switch element 120 connected adjacent to each other, and the first switch element 110. ) And a first capacitor C1 connected to the second switch element 120. In addition, the third switch element 130 formed in the touch unit 100 and connected to the scan line SL and the sensing line CL, the second capacitor C2 and the third switch element 130 connected to the third switch element. ) And the touch electrode 160 connected to the second capacitor C2.

As shown in FIG. 2, the source or drain electrode of the first switch element 110 and the source or drain electrode of the second switch element 120 are connected.

The first capacitor C1 is connected to the first switch element 110 and the second switch element 120. When the first switch element 110 is turned on, the first capacitor C1 charges the touch reference voltage Vref input from the power supply unit. The first capacitor C1 discharges the charged voltage when the second switch element 120 is turned on.

The first switch element 110 and the second switch element 120 may be a semiconductor element such as a CMOS.

As described above, the third switch element 130 is made of a thin film transistor and is formed in the display panel.

As illustrated in FIG. 7, the second capacitor C2 is a gate line, a data line, or a storage line of the metal thin film 170 or the metal line 170 and the display panel 50 connected to the third switch element 130. And a metal such as a pixel electrode and the insulator 180 interposed therebetween.

The touch electrode 160 may form a third capacitor C3 when the touch electrode 160 is contacted through a human hand or the like.

Hereinafter, a driving method of a touch sensor according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 8.

First, scan signals are sequentially supplied to the scan line SL. As illustrated in FIG. 3, scan signals are sequentially supplied to each scan line SL for one frame to turn on or turn off the third switch element 130. In this case, while the third switch element 130 is turned on by the scan signal supplied to each scan line SL, the touch sensor driver 200 may provide the first switch element 110 and the second switch element 120 to the first switch element 110. The first switch control signal IS1 and the second switch control signal IS2 are supplied.

As illustrated in FIG. 8, the first switch element 110 and the second switch element 120 alternately alternately turn on and off so that the first switch control signal IS1 and the second switch control signal IS2 are repeated. ) Is supplied. In this case, the first switch control signal IS1 and the second switch control signal IS2 may be generated internally or may be generated using a frame start signal input from the timing controller 40.

For example, when a signal indicating the start of a frame is input to the touch sensor driver 200 by the timing controller 40, the touch sensor driver 200 may generate a first switch control signal IS1 and a second switch control signal IS2. Is transmitted to the first switch element 110 and the second switch element 120.

When the first switch element 110 is turned on by the first switch control signal IS1, the second switch element 120 is turned off. In this case, as the first switch element 110 is turned on, the touch reference voltage Vref input from the power supply unit 10 is charged in the first capacitor C1. Subsequently, when the first switch element 110 is turned off and the second switch element 120 is turned on, the voltage charged in the first capacitor C1 is discharged. In this case, the voltage discharged from the first capacitor C1 may be charged in the second capacitor C2 formed in the touch unit 100 by charge sharing.

When the third switch element 130 is turned on by the scan driving signal (scan on / off), the voltage discharged from the first capacitor C1 is charged in the second capacitor C2 and the first capacitor C1 The potential of the second capacitor C2 is in the same state.

In this case, when a touch is generated in the touch unit 100, a capacitor, that is, a third capacitor C3 is formed between the touch electrode 160 and the touched object (for example, a finger). At this time, since the charged voltage is discharged and the third capacitor C3 is temporarily charged in the first capacitor C1 and the second capacitor C2, the charging voltage of the first capacitor C1 is lowered.

The touch sensor driver 200 determines a touch by measuring a potential according to charge / discharge of the first capacitor C1.

For example, when the touch reference voltage Vref is supplied at 4V, when the first switch element 110 is turned on, 4V is charged in the first capacitor C1. Subsequently, when the second switch element 120 is turned on, the first capacitor C1 and the second capacitor C2 are charged with 2 V of the first capacitor C1 and the second capacitor C2 by charge sharing. . In this case, it is assumed that the third switch element 130 is turned on.

Subsequently, when the first switch element 110 is turned on again and the second switch element 120 is turned off, the first capacitor C1 is recharged to 4V. When the first switch element is turned off and the second switch element 120 is turned on, the first capacitor C1 and the second capacitor C2 are respectively charged to 3V. As described above, the first capacitor C1 and the second capacitor C2 may be charged to 4V when the touch is not detected.

At this time, when a touch is sensed on the touch electrode 160, a third capacitor C3 is formed so that the first capacitor C1 and the second capacitor C2 form an equipotential through charge sharing with the third capacitor C3. , The potential of the first capacitor C1 drops. In this case, the touch sensor driver 200 calculates the position where the touch is generated by measuring the amount of potential reduction.

The voltage Vn measured by the first capacitor C1 may be calculated as in Equation 1.

[Equation 1]

Vn = (Vref-Vn-1) / (C1 + C2 + C3) + Vn-1

Where Vn-1 is the previously charged shared value and Vref is the touch reference voltage.

As described above, in the touch sensor driving method according to the exemplary embodiment of the present invention, the first capacitor C1 formed on the touch sensor driver 200, the second capacitor C2 formed on the display panel 50, and the touch electrode 160 are provided. When the touch is detected, the touch point may be detected by measuring the potential of the first capacitor C1.

In this case, the touch sensor driver 200 may sequentially transmit scan signals to the scan lines SL to drive an active matrix type to implement a multi-touch sensor that can detect even touch occurs at various points.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

10: power supply
20: gate driver
30: data driver
40: timing controller
50: display panel
100: touch unit
200: touch sensor drive unit

Claims (21)

A first capacitor charging a touch reference voltage, a first switch device connected to the first capacitor, a first switch device charging a touch reference voltage input from a power supply unit to the first capacitor, a first switch device connected to the first capacitor, and the first switch device And a touch sensor driver including a second switch element for discharging the voltage charged in the first capacitor. And
A third switch element formed on a display panel displaying an image, the third switch element connected to the second switch element, the second capacitor connected to the third switch element, and charged with a voltage discharged from the first capacitor; And a touch unit having a touch electrode connected with the touch electrode to form a third capacitor during touch sensing.
The method of claim 1,
The touch sensor driver
And a potential measuring unit measuring a potential of the voltage charged in the first capacitor.
The method of claim 1,
The touch unit
A scan line connected to the gate electrode of the third switch element; And
Further comprising a sensing line connected to the second switch element and the third switch element,
And the scan line and the sensing line cross each other.
The method of claim 3, wherein
The touch sensor driver
And a scan signal for driving the third switch elements respectively connected to the scan line to the scan line.
The method of claim 4, wherein
The touch sensor driver
A scan signal is supplied to the scan line while displaying an image of one frame on the display panel,
And when the next frame starts, simultaneously supplying the scan signal to the scan line to discharge the voltage charged in the second capacitor.
The method of claim 1,
And the first switch element and the second switch element are alternately turned on and off.
The method of claim 1,
The first switch device charges the touch reference voltage to the first capacitor when turned on,
The second switch element discharges the voltage charged in the first capacitor and turns on the second capacitor when turned on, so that the voltage charged in the first capacitor is equal to the voltage charged in the second capacitor. Sensing device.
The method of claim 1,
And a voltage charged in the first capacitor, the second capacitor, and the third capacitor is equally shared when the touch is generated.
The method of claim 1,
And the third switch element is formed of a thin film transistor.
The method of claim 1,
The touch electrode is formed to overlap the pixel electrode formed on the display panel.
And a plurality of pixel electrodes overlapping the touch electrodes.
Transmitting a first switch control signal for turning on the first switch element to charge the first capacitor with the touch reference voltage input from the power supply unit;
Transmitting a second switch control signal for turning on the second switch element to discharge a voltage charged in the first switch element to charge the second capacitor formed in the touch unit;
Discharging a voltage charged in the first capacitor and the second capacitor to a third capacitor formed during touch sensing to equalize the voltage charged in the first to third capacitors; And
And calculating a touch position by measuring a potential of the voltage charged in the first capacitor.
The method of claim 11,
And sequentially supplying scan signals to a plurality of third switch elements respectively connected to the plurality of scan lines formed on the touch unit.
The method of claim 12,
After sequentially supplying the scan signals to the plurality of scan lines while displaying an image of one frame,
And discharging the voltage charged in the second capacitor by simultaneously supplying the scan signals to the plurality of scan lines when a next frame starts.
The method of claim 11,
And supplying the first switch control signal and the second switch control signal alternately so that the second switch element is turned off when the first switch element is turned on.
A display panel displaying an image;
A gate driver and a data driver to drive the display panel;
A timing controller supplying a pixel voltage to the data driver;
A power supply unit supplying power to the gate driver and the data driver; And
A first capacitor charging the touch reference voltage supplied from the power supply unit, a first switch element connected to the first capacitor, and charging the first capacitor with the touch reference voltage input from the power supply unit, the first capacitor and the first capacitor; A touch sensor driver connected to a first switch element and having a second switch element discharging the voltage charged in the first capacitor; a third switch element formed on the display panel and connected to the second switch element; And a sensing device including a second capacitor connected to a third switch element and charged with a voltage discharged from the first capacitor, and a touch unit having a touch electrode connected to the third switch element to form a third capacitor upon touch sensing. Display device.
The method of claim 15,
And the timing controller provides a frame start signal to the touch sensor driver.
The method of claim 15,
The touch sensor driver detects a touch by measuring a voltage charged in the first capacitor.
The method of claim 15,
A scan line formed on the display panel and connected to the gate electrode of the third switch element;
And a sensing line connected to the touch sensor driver and formed on the display panel to cross the scan line.
The method of claim 18,
The display panel
A gate line connected to the gate driver; And
A data line connected to the data driver and formed to cross the gate line;
At least one thin film transistor connected to the gate line and the data line,
And the scan line is insulated from the gate line, and the sensing line is insulated from the data line.
The method of claim 19,
And the third switch element is manufactured in the same process as the thin film transistor.
The method of claim 15,
The display panel is a liquid crystal display panel or an organic light emitting display panel.

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