KR102504495B1 - Touch sensor integrated type display device - Google Patents

Abstract

The present invention relates to a touch sensor built-in display device capable of increasing touch precision by load-free driving, and includes a display panel, a plurality of pixel electrodes, a plurality of touch and common electrodes, a source and a touch driving circuit, It includes a gate driving circuit that supplies and a capacitance shielding unit. The display panel includes an active area and a bezel area outside the active area, and is driven by time-dividing one frame period into a display driving period and a touch driving period. A plurality of pixel electrodes are disposed in the active area and are disposed in an area defined by intersecting data lines and gate lines. A plurality of touch and common electrodes are disposed in the active area and are disposed to form an electric field with the pixel electrodes. A source and a touch driving circuit are disposed in the bezel area and are connected to the data lines. A gate driving circuit is disposed in the bezel area and is connected to the gate lines. A capacitance shield is disposed to surround the active area in the bezel area and is connected to the source and the touch driving circuit.

Description

Touch sensor built-in display device {TOUCH SENSOR INTEGRATED TYPE DISPLAY DEVICE}

The present invention relates to a display device with a built-in touch sensor.

A user interface (UI) allows a person (user) to easily control various electronic devices as he/she wants. Representative examples of such a user interface include a keypad, a keyboard, a mouse, an on-screen display (OSD), a remote controller having an infrared communication function or a radio frequency (RF) communication function, and the like. User interface technology continues to evolve in the direction of enhancing user sensibility and convenience of operation. Recently, user interfaces are evolving into touch UIs, voice recognition UIs, 3D UIs, and the like.

Touch UI is essential for portable information devices such as smart phones, and is being applied to notebook computers, computer monitors, and home appliances. Recently, a technique of embedding touch sensors in a pixel array of a display panel (hereinafter referred to as “in-cell touch sensor”) has been proposed. In-cell touch sensor technology can install touch sensors on a display panel without increasing the thickness of the display panel. These touch sensors are coupled to the pixels through parasitic capacitance. In order to reduce mutual influence due to coupling between pixels and touch sensors, one frame period includes a period for driving pixels (hereinafter referred to as “display driving period”) and a period for driving touch sensors (hereinafter referred to as “display driving period”). referred to as "touch sensor driving period").

In-cell touch sensor technology uses electrodes connected to pixels of a display panel as electrodes of touch sensors. For example, the in-cell touch sensor technology divides a common electrode for supplying a common voltage to pixels of a liquid crystal display device and uses the divided common electrode patterns as electrodes of touch sensors.

Due to coupling between in-cell touch sensors and pixels, parasitic capacitance connected to in-cell touch sensors increases. When parasitic capacitance increases, touch sensitivity and accuracy of touch recognition deteriorate. To reduce the effect of parasitic capacitance on the touch sensing result, the LoAD Free Driving Method is used.

The load-free driving method supplies an alternating current signal having the same phase and amplitude as the touch driving signal supplied to the touch and common electrodes to the data lines and gate lines of the display panel during the touch sensor driving period, thereby providing parasitic capacitance of the touch sensor. This reduces the effect on the touch sensing result. In this method, the data voltage of the input image is supplied to the data lines during the display driving period, and a gate pulse (consisting of a gate high voltage (VGH) and a gate low voltage (VGL)) synchronized with the data voltage of the input image is applied to the gate line. and AC signals synchronized with the touch driving signal are supplied to the data lines and gate lines during the touch sensor driving period.

When the load-free driving method is adopted, a touch driving signal is supplied to the touch and common electrodes that form parasitic capacitance, and an AC signal having the same phase and amplitude as the touch driving signal is supplied to the signal lines of the gate lines and data lines. Since it is applied, the influence of parasitic capacitance can be excluded. This is because voltages supplied to the touch and common electrodes and signal lines forming parasitic capacitance are simultaneously changed, and the smaller the voltage difference, the smaller the amount of charge charged in the parasitic capacitance. Theoretically, according to the load-free driving method, since the amount of charge charged in the parasitic capacitance becomes zero, a load-free effect equivalent to no parasitic capacitance is obtained.

The load-free effect can be obtained when the phase and amplitude of the touch driving signal supplied to the touch and the common electrode and the AC signal supplied to the signal lines of the data line and gate line are perfectly matched.

Meanwhile, in a bezel area outside the active area where an image of the display device is displayed, various signal wires for testing the display device, an electrostatic discharge wire for preventing static electricity, and a ground wire are disposed adjacent to the active area.

Parasitic capacitance is formed between the touch and common electrodes disposed at the edge of the active area and these wires disposed in the bezel area by a fringe field. The fringe field capacitance formed in this way acts as touch noise and causes a decrease in touch precision.

1 is an image showing touch raw data in a state in which a touch is performed on a central portion of a touch area (active area) of a display device with a built-in touch sensor in the related art.

Referring to FIG. 1 , touch raw data of the base line below the active area is 5,032, but raw data of the upper left corner is 8,327 and raw data of the lower right corner is 11,723. From the image of raw data shown in FIG. 1, it can be seen that despite the touch being performed in the center of the active area (3360 indicates the difference between the raw data before and after the touch), high touch raw data appears along the boundary of the active area. There is fringe static electricity between test wires such as gate signals and data signals disposed in the bezel area outside the active area, wires connected to the electrostatic discharge circuit, and ground wires and the touch and common electrodes disposed in the active area. This is because fringe capacitance is formed and they act as touch noise.

In a display device with a built-in touch sensor in the related art, there is a problem in that a touch position cannot be accurately detected because touch raw data at a position where no touch is performed is high.

Accordingly, an object of the present invention is to provide a display device with a built-in touch sensor capable of solving the above-described conventional problems.

A touch sensor built-in display device according to the present invention includes a display panel, a plurality of pixel electrodes, a plurality of touch and common electrodes, a source and touch driving circuit, a supplying gate driving circuit, and a capacitance shielding unit. The display panel includes an active area and a bezel area outside the active area, and is driven by time-dividing one frame period into a display driving period and a touch driving period. A plurality of pixel electrodes are disposed in the active area and are disposed in an area defined by intersecting data lines and gate lines. A plurality of touch and common electrodes are disposed in the active area and are disposed to form an electric field with the pixel electrodes. A source and a touch driving circuit are disposed in the bezel area and are connected to the data lines. A gate driving circuit is disposed in the bezel area and is connected to the gate lines. A capacitance shield is disposed to surround the active area in the bezel area and is connected to the source and the touch driving circuit.

In addition, the display device with a built-in touch sensor according to the present invention may further include test signal wires arranged in a bezel area outside the capacitance shielding part.

In addition, the touch sensor built-in display device according to the present invention may further include an electrostatic ground wire disposed between the capacitance shielding unit and the test signal wire.

In addition, the test signal wires may include gate test wires respectively connected to the gate lines, data test wires respectively connected to the data lines, and touch and common electrode test wires respectively connected to the touch and common electrodes. may contain wires.

In addition, a first pad including first pads connected to one end of the gate test wires, the data test wires, the touch and common electrode test wires, and the electrostatic ground wire is connected to one edge of the bezel area. A pad unit is disposed, and second pads to which the other ends of the gate test wires, the data test wires, the touch and common electrode test wires, and the electrostatic ground wire are respectively connected are connected to the other edge of the bezel area. A second pad portion to be disposed.

In addition, the capacitance shielding unit includes a shielding voltage supply wire connected to the source and the touch driving circuit, and a shielding electrode overlapping with the shielding voltage supply wire and connected to the shielding voltage supply wire and disposed to surround the active area. includes

In addition, the shielding electrode includes a first shielding electrode disposed to surround the left half of the active region with the center of the active region as a boundary, and a second shielding electrode disposed to surround the right half of the active region.

Also, during the touch driving period, a touch driving signal is supplied to the plurality of touches and the common electrode, and a load-free driving signal having the same phase and the same amplitude as the touch driving signal is supplied to the capacitance shielding part.

In addition, during the touch driving period, a touch driving signal is supplied to the plurality of touches and the common electrodes, and a load-free driving signal having the same phase and the same amplitude as the touch driving signal is supplied to the test signal wires and the electrostatic ground wire. is supplied

According to the touch sensor-integrated display device according to the present invention, parasitic capacitance caused by a fringe field formed between the touch and common electrodes disposed at the edge of the active area and various wires disposed in the bezel area can be removed, so that the load It is possible to obtain the effect of increasing the touch precision by the load free driving.

1 is an image showing touch raw data of a touch area (active area) of a conventional display device with a built-in touch sensor;
2 is a block diagram schematically showing a display device with a built-in touch sensor according to an embodiment of the present invention;
3 is a block diagram schematically showing the basic configuration of a touch and a common electrode of a display device with a built-in touch sensor according to an embodiment of the present invention;
4 is a plan view specifically showing various wires and pads disposed in a bezel area of a display device with a built-in touch sensor according to an embodiment of the present invention;
5 is an enlarged plan view of a partial area A shown in FIG. 4;
6 is an enlarged plan view of a partial region B shown in FIG. 4;
7 is a waveform diagram illustrating waveforms of signals supplied to various wires disposed in the bezel area of FIG. 4 during a display driving period and a touch driving period;

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Like reference numbers throughout the specification indicate substantially the same elements. In the following description, if it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

The touch sensor built-in display device of the present invention includes a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting diode display (Organic It can be implemented with touch sensors embedded in an in-cell type in flat panel display devices such as Light Emitting Display (OLED) and Electrophoresis (EPD). In the following embodiments, a liquid crystal display element will be described as an example of a flat panel display element, but it should be noted that the display device of the present invention is not limited to the liquid crystal display device.

First, referring to FIG. 2 , a display device with a built-in touch sensor according to an embodiment of the present invention will be described in detail.

2 is a block diagram schematically illustrating a display device with a built-in touch sensor according to an embodiment of the present invention.

Referring to FIG. 2 , a display device with a built-in touch sensor according to an embodiment of the present invention includes a display panel 100, a source and touch driving circuit 202, a gate driving circuit 204, a timing controller 104, and the like. .

In the display panel 100, a liquid crystal layer is formed between two glass substrates. On the lower substrate of the display panel 100, a plurality of data lines (D1 to Dm, where m is a positive integer) and a plurality of gate lines (G1 to Gn, where n is a positive integer) crossing the data lines (D1 to Dm). an integer of), a plurality of thin film transistors (TFT) formed at intersections of the data lines (D1 to Dm) and the gate lines (G1 to Gn), and a plurality of data voltages for charging the liquid crystal cells (Clc). A pixel array including a pixel electrode P of the pixel electrode P, a storage capacitor Cst connected to the pixel electrode P to maintain the voltage of the liquid crystal cell, and touch and common electrodes T are formed.

The pixels of the display panel 100 are formed in a pixel area defined by the data lines D1 to Dm and the gate lines G1 to Gn and are arranged in a matrix form. The liquid crystal cell of each of the pixels is driven by an electric field applied according to a voltage difference between the data voltage applied to the pixel electrode P and the common voltage Vcom applied to the touch and common electrode T, thereby increasing the transmission amount of incident light. to adjust The thin film transistors TFT are turned on in response to gate pulses from the gate lines G1 to Gn to supply voltages from the data lines D1 to Dm to the pixel electrode P of the liquid crystal cell.

The upper glass substrate SUB2 of the display panel 100 may include a black matrix BM, color filters R, G, and B, and an overcoat layer OC covering them. Meanwhile, the lower glass substrate SUB1 of the display panel 100 may be implemented with a color filter on TFT (COT) structure. In this case, the black matrix and color filters may be formed on the lower glass substrate of the display panel 100 .

The touch and common electrode (T) are formed on the upper glass substrate in vertical electric field driving methods such as TN (Twisted Nematic) mode and VA (Vertical Alignment) mode, IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode It is formed on the lower glass substrate together with the pixel electrode P in the horizontal electric field driving method. The touch and common electrodes T may be connected to the touch/common routing wires W1 to Wr to receive a common voltage Vcom.

Polarizing plates are attached to each of the upper glass substrate SUB2 and the lower glass substrate SUB1 of the display panel 100, and an alignment layer for setting a pretilt angle of the liquid crystal is formed on an inner surface in contact with the liquid crystal. A column spacer may be formed between the upper glass substrate SUB2 and the lower glass substrate SUB1 of the display panel 100 to maintain a cell gap of the liquid crystal cell.

The source and touch driving circuit 202 includes a source driving IC (S-IC) for driving a data line and a touch driver IC (T-IC) for driving and sensing a touch and a common electrode. Each of the source driving IC (S-IC) and the touch drive IC (T-IC) may be configured in plurality according to the size of the display device. The source driving IC (S-IC) outputs an analog video data voltage during a preset display period.

The source driving IC latches digital video data (RGB) input from the timing controller 104. The source driving IC converts the digital video data (RGB) into an analog positive/negative polarity gamma compensation voltage and outputs an analog video data voltage. The analog video data voltage is supplied to the data lines D1 to Dm (m is a natural number).

The touch drive IC (T-IC) supplies touch driving voltage to the touch and common electrodes T through the touch/common lines W1 to Wr (r is a natural number smaller than m) during the touch driving period and By sensing the driving electrodes T, whether a touch is detected and a touch location are determined. The touch driving period is a time-division period of one frame period, and one frame period can be time-divided into at least one display driving period and at least one touch driving period. Driving and sensing of the touch/driving electrodes T can be either a self-capacitance method or a mutual capacitance method.

The gate drive circuit 204 includes at least one gate drive IC (G-IC). The gate driving IC sequentially supplies scan pulses (or gate pulses) synchronized with the analog video data voltage to the gate lines G1 to Gn under the control of the timing controller 104 during the display period, so that the analog video data voltage is written. Select the line of the display panel. The scan pulse is generated as a swinging pulse between a gate high voltage (VGH) and a gate low voltage (VGL). The scan driving circuit 204 continuously supplies the gate low voltage to the gate lines G1 to Gn without generating a scan pulse during the touch sensor driving period. Therefore, the gate lines G1 to Gn supply gate pulses to the thin film transistors (TFTs) of the pixels during the display period to sequentially select lines on which data is to be written in the display panel 100, and during the touch drive period, the gate low hold the voltage

The timing controller 104 receives timing signals such as a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), a data enable signal (DE), and a main clock (MCLK) input from an external host system. Timing control signals for controlling operation timings of the source and touch driving circuit 202 and the scan driving circuit 204 are generated. The timing control signals of the scan driving circuit 204 include a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GOE), and a shift direction control signal. (DIR) and the like. The timing control signals of the source and touch driving circuit 202 include a source sampling clock (SSC), a polarity control signal (Polarity, POL), a source output enable signal (Source Output Enable, SOE), and a touch driving signal. (Touch Enable Signal, TDS), etc.

The timing controller 104 time-divides one frame period into at least one display period and at least one touch driving period by controlling timing control signals. The timing controller 104 enables the source IC (S-IC) of the source and touch driving circuit 202 and the output of the scan driving circuit 204 during the display period to display video data in pixels. The timing controller 104 detects the touch position by driving the touch IC (T-IC) of the source and touch driving circuit 202 during the touch driving period. The display period and the touch driving period may be appropriately adjusted in consideration of panel characteristics according to the type of the display panel 100 .

Next, with reference to FIG. 3 , the configuration of the touch and common electrodes of the display device with a built-in touch sensor according to an embodiment of the present invention will be described in more detail.

3 is a block diagram schematically illustrating a basic configuration of a touch and a common electrode of a display device with a built-in touch sensor according to an embodiment of the present invention. The embodiment of FIG. 3 shows the configuration of the self-capacitance type touch and common electrode, and the touch and common electrodes and touch/common wires are very simply configured for simplicity of explanation. In addition, although a self-capacitance touch and a common electrode are described as an example in FIG. 3 , the present invention is not limited thereto. It is clear that the present invention can also be implemented in a mutual capacitance manner. Since the configuration of the mutual capacitance touch and the common electrode is a well-known configuration, further description thereof will be omitted.

Referring to FIG. 3 , a display device with a built-in touch sensor according to an embodiment of the present invention includes a plurality of touch and common electrodes (T11 to T15, T21 to T25, T31 to T35, T41 to T45) disposed in a display area, Touch/common wires (W11-W41, W12-W42, W13-W43, W14-W44, W15 ~ W45), and a touch driving IC (T-IC) connected to the touch/common lines (W11 to W41, W12 to W42, W13 to W43, W14 to W44, and W15 to W45).

The touch driving IC (T-IC) supplies touch driving voltage to a plurality of touch and common electrodes (T11 to T15, T21 to T25, T31 to T35, T41 to T45) during the touch driving period, and touch/common wires (W11~W41, W12~W42, W13~W43, W14~W44, W15~W45) to sense multiple touches and common electrodes (T11~T15, T21~T25, T31~T35, T41~T45) Receive sensing data. These sensing data are analyzed through a preset touch recognition algorithm and then calculated as coordinate values. Coordinate value calculation through processing of sensing data may be performed through a touch driving IC (T-IC) or a separate touch controller (not shown). The coordinate value data of the calculated touch position is transmitted to an external host system (not shown). The host system executes an application program indicated by the coordinate value of the touch position.

Next, with reference to FIGS. 4 to 6 , a configuration of a display device with a built-in touch sensor according to an embodiment of the present invention will be described in more detail.

4 is a plan view specifically illustrating various wires and pads disposed in a bezel area of a display device with a built-in touch sensor according to an exemplary embodiment of the present invention. FIG. 5 is an enlarged plan view of a partial region A shown in FIG. 4 , and FIG. 6 is an enlarged plan view of a partial region B shown in FIG. 4 . In FIGS. 4 to 6 , since gate lines and data lines connected to pixels in the active area and touch/common wires connected to touch and common electrodes are general configurations, they are omitted for simplicity of description.

4 to 6, in the bezel area BA of the display device with a built-in touch sensor according to an embodiment of the present invention, a source and touch driving circuit 202 and a gate driving circuit 204, a first pad part ( 301) and the second pad part 302 are disposed.

The source and touch driving circuit 202 is disposed on one side of the active area AA to supply data voltages to pixels in the active area AA through data lines, and to touch and common electrodes through touch/common wires. Supply common voltage and touch driving voltage.

The gate driving circuit 204 sequentially supplies gate signals to gate lines.

The first pad part 301 is a part where first pads for receiving a test signal from the outside are disposed, and the second pad part 302 is a part for test wires, electrostatic discharge wires, and ground wires from the outside. This is a portion where second pads for supplying signals are disposed.

The bezel area BA also includes a shielding electrode SP, a shielding voltage supply line SL, a transistor formation area TA for testing and preventing static electricity, and electrostatic grounding from the boundary between the active area AA and the bezel area BA. A wire EG, a gate test wire AG, a data test wire AD, and a ground pattern GP are disposed.

The shielding electrode SP is disposed closest to the active area AA. The shielding electrodes SP may be arranged in one pattern to surround the active area AA, and as shown in FIG. 4 , the active area AA is divided into left and right sides with the center as a boundary, and the left shielding electrode SP ) and the right shielding electrode (SP). When the shielding electrode is divided into the left shielding electrode (SP) and the right shielding electrode (SP), the shielding voltage supplied through the shielding voltage supply line (SL) is equally supplied to both sides. There is an advantage in that resistance can be reduced compared to the case where the shielding voltage is supplied through the shielding voltage supply line.

The shielding voltage supply line SL is disposed to overlap the shielding electrode SP in a different layer from the shielding electrode SP, and is connected to the shielding electrode SP through at least one contact hole CH. The shielding voltage supply line SL supplies the touch driving voltage supplied to the touch and common electrodes from the touch driving IC T-IC of the touch and data driving circuit 202 to the shielding electrode SP during the touch driving period. do.

In the embodiment of FIG. 4 , the left shielding electrode SP is connected to the source and the left touch driving IC (T-IC) of the touch driving circuit 202 through the left shielding voltage supply line SL. The right shielding electrode SP is connected to the source and the right touch driving IC (T-IC) of the touch driving circuit 202 through the right shielding voltage supply line SL.

Unlike the embodiment of FIG. 4 , the shielding electrode SP may be disposed as one rather than being divided. In this case, the shielding electrode is disposed to surround the active region.

Outside the shielding electrode SP, a thin film transistor arrangement area TA in which thin film transistors for testing pixels and transistors for an electrostatic discharge circuit are formed is positioned.

An electrostatic ground wire EG connected to an electrostatic discharge circuit is disposed outside the thin film transistor arrangement area TA.

Gate test wires AG for testing gate lines are disposed outside the electrostatic ground wire EG. The gate test lines AG are respectively connected to gate lines disposed in the active area AA.

Data test lines AD for testing data lines are disposed outside the gate test lines AG. The data test lines AD are respectively connected to data lines disposed in the active area AA.

Positions of the gate test lines AG and the data test lines AD may be reversed.

A ground pattern GP is disposed outside the data test lines AD. The ground pattern GP is to block static electricity introduced from the outside and is disposed to surround other wires at the outermost side of the bezel area BA.

One end of each of the gate test lines AG and data test lines AD is connected to the first pads of the first pad part 301, and the other end is connected to the second pad of the second pad part 302. connected to fields

The electrostatic ground wire EG is disposed to surround the active area and both ends are connected to the first pads of the first pad unit 301 . The ground pattern GP can be divided into left and right sides, and one end of each of the left and right ground patterns GP and GP is attached to the first pad of the first pad part 301, and the other end is attached to the second pad part 302. ) may be respectively connected to the second pads.

4, lead wires are disposed in an OLB (Outer Leading Block) (OLB) between the source and touch driving circuit 202 and the first pad unit 301, and the terminals of the source and touch driving circuit 202 and the first The first pads of the pad unit 301 are connected to each other to transmit and receive signals to and from external circuits.

Next, with reference to FIG. 7 , effects obtained by signals supplied to various wires disposed in a bezel area in a display device with a built-in touch sensor according to an embodiment of the present invention will be described.

7 is a waveform diagram illustrating waveforms of signals supplied to various wires disposed in the bezel area of FIG. 4 during a display driving period and a touch driving period.

Referring to FIG. 7 , in the display device with a built-in touch sensor according to an embodiment of the present invention, during a touch driving period (TP) of one frame period, the touch driving IC (T-IC) of the source and touch driving circuit 202 is timing According to the touch driving signal TDS from the controller 104, the shielding voltage supply line SL, electrostatic ground wire EG, gate test wires AG, and data test wires disposed in the bezel area BA. A load pre-driving signal LFD having the same phase and amplitude as the touch driving signal TDS supplied to the touch and common electrodes T is supplied to (AD).

In the display device with a built-in touch sensor according to an embodiment of the present invention, the load-free driving signal LFD supplied to the shielding voltage supply line SL drives the source and the touch driving IC (T-IC) of the touch driving circuit 202. The load pre-driving signal LFD supplied to the electrostatic ground wire EG, the gate test wires AG, and the data test wires AD is supplied through the first pads of the first pad unit 301. It can be supplied from outside.

However, the present invention is not limited thereto, and if the touch driving IC (T-IC) of the source and touch driving circuit 202 has sufficient terminals, the electrostatic ground wire (EG) and the gate test wires (AG) After connecting the source and the data test lines AD to the touch driving IC (T-IC) of the touch driving circuit 202, the load pre driving signal (LFD) may be supplied from the touch driving IC (T-IC). .

According to the touch sensor-integrated display device according to the above-described embodiment of the present invention, during the touch driving period, the touch in the active area AA and the touch driving signal TDS supplied to the common electrodes T are in the same phase and in the same phase. A load pre-driving signal having an amplitude is supplied to all of the shielding voltage supply line SL, the electrostatic ground wire EG, the gate test wires AG, and the data test wires AD disposed in the bezel area.

As such, the shielding voltage supply line SL is connected to the shielding electrode SP, the shielding electrode SP is disposed close to the active area AA and surrounds the active area AA, and the touch driving period TP ), since the load-free driving signal LFD having the same phase and same amplitude as the touch driving signal TDS supplied to the touch and common electrodes T of the active area AA is supplied to the shielding electrode SP, Parasitic capacitance is not generated between the touch and common electrodes T of the active area AA and the shield electrode SP of the bezel area BA, which are disposed closest to each other. Therefore, it is possible to prevent the parasitic capacitance caused by the fringe field between the shielding electrode (SP) disposed in the bezel area and the touch and common electrodes, thereby removing touch noise, thereby increasing touch precision. there is.

Moreover, the electrostatic ground wire (EG), gate test wires (AG), and data test wires (AD) disposed outside the shielding electrode are also affected by the touch and common electrodes of the active area (AA) during the touch driving period (TP). Since the load-free driving signal LFD having the same phase and same amplitude as the touch driving signal TDS supplied to (T) is supplied, the touch and common electrodes T of the active area AA and the bezel area ( Parasitic capacitance is not generated between the electrostatic ground wire EG, gate test wires AG, and data test wires AD of BA). Therefore, it is possible to prevent parasitic capacitance caused by a fringe field between various wires disposed in the bezel area BA and the touch and common electrodes, thereby eliminating touch noise, thereby obtaining an effect of increasing touch precision. can

Through the above description, those skilled in the art will know that various changes and modifications are possible without departing from the technical spirit of the present invention.

For example, in the description of an embodiment of the present invention, an electrostatic ground wire and gate and data test wires are described in a bezel area, but the present invention is not limited thereto. In addition to gate and data test wires, touch and common electrode test wires, and enable wires of these test wires may be disposed in the bezel area. In this case, these wires also have the same phase and same phase as the touch driving signal during the touch driving period. A load pre-drive signal (LFD) of amplitude is supplied.

In addition, in the embodiment of the present invention, the case where the source and the touch driving circuit are one has been described as an example, but the present invention is not limited thereto. Depending on the size and quality of the display panel, two or more sources and touch driving circuits may be included.

Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be determined by the claims.

100: display panel 104: timing controller
202: source and touch driving circuit 204: gate driving circuit
AA: active area BA: bezel area
EG: Electrostatic Ground Wire AG: Gate Test Wire
AD: data test wire GP ground pattern
SP: shielding electrode SL: shielding voltage supply line
TA: thin film transistor arrangement area
LFD: load free driving signal TDS: touch driving signal
T11~T15, T21~T25, T31~T35, T41~T45: touch and common electrode
W11~W41, W12~W42, W13~W43, W14~W44, W15~W45: Touch/common wiring

Claims (10)

a display panel including an active area and a bezel area outside the active area, and driven by time-dividing one frame period into a display driving period and a touch driving period;
a plurality of pixel electrodes disposed in the active area and disposed in an area defined by intersecting data lines and gate lines;
a plurality of touch/common electrodes disposed in the active area and disposed to form an electric field with the pixel electrodes;
a source and touch driving circuit disposed in the bezel area and connected to the data lines;
a gate driving circuit disposed in the bezel area and connected to the gate lines; and
a capacitance shield disposed in the bezel area to surround the active area and connected to the source and the touch driving circuit;
During the touch driving period, a touch driving signal is supplied to the plurality of touches and the common electrode, and a load having the same phase and the same amplitude as the touch driving signal is applied to the data lines, the gate lines, and the capacitance shielding part. A display device with a built-in touch sensor to which a pre-drive signal is supplied.
According to claim 1,
The display device with a built-in touch sensor further comprising test signal wires disposed in a bezel area outside the capacitance shielding unit.
According to claim 2,
The touch sensor embedded display device further comprises an electrostatic ground wire disposed between the capacitance shielding portion and the test signal wires.
According to claim 3,
The test signal wires include gate test wires respectively connected to the gate lines, data test wires respectively connected to the data lines, and touch and common electrode test wires respectively connected to the touch and common electrodes. A display device with a built-in touch sensor.
According to claim 4,
a first pad portion including first pads connected to one end of the gate test wires, the data test wires, the touch and common electrode test wires, and the electrostatic ground wire at one edge of the bezel area; being placed,
a second pad portion including second pads connected to the gate test wires, the data test wires, the touch and common electrode test wires, and the other ends of the electrostatic ground wire at the other edge of the bezel area; Display device with built-in touch sensor.
According to claim 1,
The capacitance shielding part,
a shielding voltage supply wire connected to the source and the touch driving circuit; and
and a shielding electrode overlapping the shielding voltage supply wire, connected to the shielding voltage supply wire, and disposed to surround the active area.
According to claim 6,
The shielding electrode includes a first shielding electrode disposed to surround the left half of the active area with the center of the active area as a boundary, and a second shielding electrode disposed to surround the right half of the active area. Built-in display.
delete According to claim 3,
During the touch driving period, the load-free driving signal is supplied to the test signal wires and the electrostatic ground wire.
According to claim 6,
The shielding voltage supply wiring,
a first shielding voltage supply wire disposed to overlap a capacitance shield adjacent to a first side of the active area; and
a second shielding voltage supply wire disposed to overlap a capacitance shield adjacent to a second side of the active area facing the first side;
Each of the first and second shielding voltage supply wires is connected to the shielding electrode through a plurality of contact holes.

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