KR20160035195A - Touch sensor integrated ttype display device - Google Patents

Abstract

The present invention relates to a touch sensor integrated display device to prevent the number of manufacturing processes from increasing and resolution from being degraded, and increase touch sensitivity. The touch sensor integrated display device comprises: a plurality of gate lines and a plurality of data lines arranged to intersect with each other; a plurality of pixel electrodes; and a plurality of common electrodes. The pixel electrode is arranged on an area defined by intersection between the gate lines and the data lines. The common electrode is arranged to face the pixel electrodes. The gate lines are grouped into at least two units to constitute a plurality of first touch electrodes. The data lines are grouped into at least two units to constitute a plurality of second touch electrodes.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch sensor integrated type display device,

The present invention relates to a touch sensor integrated type display device capable of recognizing a user's touch.

2. Description of the Related Art In recent years, various input devices such as a keyboard, a mouse, a trackball, a joystick, and a digitizer have been used to configure an interface between a user and a home appliance or various information communication devices. However, the use of the above-described input device has a problem in that it requires the user to learn how to use the device and causes inconvenience such as occupying a space. Therefore, there is a growing demand for an input device that is convenient and simple and can reduce malfunctions. In response to such demands, a touch sensor has been proposed in which a user directly touches the screen with a finger or a pen to input information.

The touch sensor is simple, has little malfunction, can be input without using a separate input device, and is also applicable to various display devices because of convenience that the user can quickly and easily operate the contents displayed on the screen have.

The touch sensor can be classified into an add-on type and an on-cell type depending on the structure. In the top plate attaching type, a touch panel is attached to an upper plate of a display device after separately manufacturing a display device and a touch panel formed with a touch sensor. The top plate integral type is a method of directly forming a touch sensor on the surface of the upper glass substrate of the display device.

In the top-panel mounting type, a completed touch panel is mounted on a display device and is mounted thereon, resulting in a thick thickness, and the brightness of the display device becomes dark and visibility deteriorates.

On the other hand, in the case of the integrated top plate, the thickness of the touch sensor can be reduced compared to the top plate type with a separate touch sensor formed on the top surface of the display device. However, the driving electrode layer and the sensing electrode layer constituting the touch sensor, There is a problem that the manufacturing cost increases due to an increase in thickness and an increase in the number of processes.

Accordingly, there is a need for a touch sensor integrated type display device capable of solving the problems of the related art, and a touch sensor integrated type display device such as Korean Patent Laid-Open Publication No. 10-2013-0110906 is known.

In the touch sensor integrated type display device disclosed in the above publication, the common electrode for display is divided and used as touch electrodes for touch driving and sensing, thereby eliminating the need to form separate touch electrodes. Therefore, the touch sensor integrated type display device can solve the problem of the top plate integrated type and top plate integrated type touch sensor.

However, in the touch sensor integrated type display device disclosed in the above-mentioned patent publication, a separate electrode for connecting the common electrode and the touch electrode is required, so that a separate process for forming these wires is required There is a problem that the image quality is deteriorated and the touch sensitivity is lowered due to an increase in parasitic capacitance due to these wirings.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the conventional problems described above, and it is an object of the present invention to provide a touch sensing device and a touch sensing device, And it is an object of the present invention to provide a touch sensor integrated type display device capable of preventing an increase in the number of process steps and a deterioration in image quality and increasing a touch sensitivity.

To achieve the above object, the touch sensor integrated display of the present invention includes a plurality of gate lines and data lines arranged to intersect with each other, and a plurality of pixel electrodes and a common electrode. The pixel electrode is disposed in an area defined by the intersection of the plurality of gate lines and the data lines, respectively. The common electrode is disposed opposite to the plurality of pixel electrodes. The plurality of gate lines are grouped into at least two units to constitute a plurality of first touch electrodes. The plurality of data lines are grouped into at least two units to constitute a plurality of second touch electrodes.

In the present invention, gate pulses are sequentially supplied to the gate lines during a display period constituting a part of one frame period, and a data signal is supplied to the plurality of pixel positive electrodes through the data lines, The touch driving voltage is supplied to any one of the plurality of first touch electrodes and the plurality of second touch electrodes during a touch period constituting the remaining period of the touch electrodes, Are sensed.

The touch sensor integrated type display further includes a plurality of first connection wirings connecting the plurality of gate lines in at least two units and a plurality of second connection wirings connecting the plurality of data lines in at least two units .

In addition, a plurality of gate lines and a plurality of first connection wirings are formed on the substrate, and a plurality of data lines and a plurality of second connection wirings may be formed on the gate insulation film.

Further, a plurality of pixel electrodes are formed on the gate insulating film, and are disposed apart from the plurality of data lines and the plurality of second connection wirings.

The touch sensor integrated type display device further includes first routing wirings for respectively connecting the plurality of first connection wirings to the touch sensor processor and a plurality of second routing wirings for respectively connecting the plurality of second connection wirings to the touch processor .

The touch sensor integrated type display device according to the present invention does not need to separately form touch electrodes for touch sensing in the pixel region and it is necessary to form a separate wiring for dividing the common electrode and connecting the divided common electrodes I will not. Therefore, not only unnecessary processes are omitted, but also the parasitic capacitance caused by the unnecessary wiring formed in the pixel region can be removed, so that the deterioration of the image quality can be prevented and the effect of improving the touch sensitivity can be obtained have.

1 is a block diagram schematically showing a touch sensor integrated display device according to an embodiment of the present invention.
Fig. 2 is a partially exploded perspective view schematically showing the display device shown in Fig. 1,
3 is a plan view schematically illustrating a touch sensor structure of a touch sensor integrated type display device according to an embodiment of the present invention,
4 is a plan view showing one pixel region of the touch sensor integrated type display device according to the embodiment of the present invention,
5 is a cross-sectional view taken along the line I-I 'shown in FIG. 4;

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals throughout the specification denote substantially identical components. In the following description, the touch sensor integrated type liquid crystal display device will be specifically described as an example of the touch sensor integrated type display device.

First, a touch sensor integrated display device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a block diagram schematically showing a touch sensor integrated display device according to an embodiment of the present invention, and FIG. 2 is a partially exploded perspective view schematically showing the touch sensor integrated display device shown in FIG.

1, the touch sensor integrated type liquid crystal display device includes a liquid crystal display panel (LCP), a host controller 10, a timing controller 11, a data driver 12, a gate driver 13, A power supply unit 15, a touch sensor processor 17, and the like.

The liquid crystal display panel LCP includes a color filter array CFA and a thin film transistor array TFTA which are formed with a liquid crystal layer (not shown) interposed therebetween.

1 and 2, the thin film transistor array TFTA includes a plurality of gate lines G1 to Gm formed in parallel on a first substrate SUB1 in a first direction (for example, x direction) Data lines D1 to Dn formed in a second direction (for example, y direction) so as to intersect with the plurality of gate lines G1 to Gm, data lines D1 to Dn arranged to cross the gate lines G1 to Gm and data Thin film transistors TFT formed in a region where the lines D1 to Dn intersect each other, a plurality of pixel electrodes Px for charging data voltages to the liquid crystal cells, a plurality of pixel electrodes Px opposed to the plurality of pixel electrodes Px, (Not shown) arranged so as to be spaced apart from each other.

1 and 2, the gate lines G1 to Gm in the integrated touch sensor display device are grouped into several units by the first connection wiring lines and are connected to the first touch electrodes And the data lines D1 to Dn are also grouped in several units by the second connection wiring and serve also as a function of the second touch electrode (touch sensing electrode or touch driving electrode).

The common electrode is formed on the second substrate SUB2 in a vertical electric field driving method such as a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode, and is formed in the IPS (In Plane Switching) mode and the FFS And is formed on the first substrate SUB1 together with the pixel electrode Px in the horizontal field driving method. In the following embodiments of the present invention, the horizontal electric field driving method will be described as an example, but the present invention is not limited thereto and can be applied to the vertical electric field driving method.

Hereinafter, a thin film transistor array (TFTA) of a touch sensor integrated type display apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 to 5. FIG. FIG. 3 is a plan view schematically illustrating a touch sensor structure of a touch sensor integrated type display device according to an embodiment of the present invention. FIG. 4 is a plan view showing one pixel region of a touch sensor integrated type display device according to an embodiment of the present invention. And FIG. 5 is a cross-sectional view taken along the line I-I 'shown in FIG.

3, a touch sensor of a thin film transistor array (TFTA) according to an embodiment of the present invention groups gate lines G1 to Gm arranged in a first direction (for example, x-axis direction) A plurality of first connection wirings TCL1 to TCLx (x is a natural number) for grouping data lines D1 to Dn arranged in a second direction (e.g., y-axis direction) And second connection interconnections RCL1 to RCLy (y is a natural number).

The first connection wirings TCL1 to TCLx constitute a plurality of first touch electrodes TX1 to TXx together with the gate lines G1 to Gm and the second connection wirings RCL1 to RCLy constitute a plurality of first touch electrodes TX1 to TXx, And a plurality of second touch electrodes RX1 to RXy together with the first to fourth touch electrodes D1 to Dn.

3, the gate lines G1 to Gm and the data lines D1 to Dn are each grouped into four units. In the touch sensor integrated display device shown in FIG. However, this is merely illustrative for convenience of description, and can be grouped into at least two or more, and therefore can be grouped into fewer or larger numbers.

The touch sensor of the touch sensor integrated display device according to the embodiment of the present invention may further include a plurality of first touch electrodes TX1 to TXx connected to the plurality of first connection wirings TCL1 to TCLx, A plurality of first routing wirings TW1 to TWx connected to the first connection wiring 17 and a plurality of second connection wirings RCL1 to RCLy to connect the second touch electrodes RX1 to RXy to the touch recognition processor 17) for connecting the first and second wiring lines (RW1 to RWy).

4 and 5, a touch sensor integrated display device according to an embodiment of the present invention includes gate lines GL and data lines DL formed to intersect each other on a first substrate SUB1, Thin film transistors TFT formed at intersections of the gate lines GL and the data lines DL and regions defined by the intersection of the gate lines GL and the data lines DL. And a common electrode COM formed so as to face the pixel electrode Px.

The gate lines GL, Gl to Gm are formed on the first substrate SUB1. The gate lines GL, G1 to Gm are connected to each other by first connection wirings TCL1 to TCLx in at least two units (four gate line units in the example of Fig. 3) And is connected to the touch recognition processor 17 through the 1-1 touch routing wirings TW1 through TWx.

The thin film transistor TFT includes a gate electrode GE formed on the first substrate SUB1 and extending from the gate line GL and a gate insulating layer GI covering the gate line GL and the gate electrode GE A source electrode SE extending from the data line DL formed on the active layer A and a source electrode SE extending from the source electrode SE to the data line DL, And a drain electrode DE formed so as to face each other.

The data lines DL, D1 to Dn are formed on the gate insulating film GI. The data lines DL, D1 to Dm are connected to each other by the second connection wirings RCL1 to RCLy in at least two units (four data line units in the example of Fig. 3) And is connected to the touch recognition processor 17 through the second touch routing wirings RW1 to RWy.

The pixel electrode Px is formed on the gate insulating film GI, and one end thereof is connected to the drain electrode DE. One end of the drain electrode DE is formed so as to cover one end of the pixel electrode Px so that the drain electrode DE of the thin film transistor TFT and the pixel electrode Px are directly connected.

The thin film transistor TFT and the pixel electrode Px thus formed are covered with a first protective film PAS1 and a second protective film PAS2 is formed thereon for planarization.

A common electrode COM is formed on the second protective film PAS2 so as to overlap with the pixel electrodes Px.

The pixel electrodes Px formed on the first passivation layer PAS1 are formed without slits and the common electrode COM formed on the second passivation layer PAS2 is formed with the slits SL.

Although the pixel electrode Px is formed on the gate insulating layer GI and directly connected to the drain electrode DE in the embodiment of the present invention, the pixel electrode Px may be formed on the first passivation layer PAS1, As shown in FIG. In this case, the pixel electrode Px may be connected to the drain electrode DE through a contact hole passing through the first protective film PAS1.

The color filter array CFA includes a black matrix and a color filter formed on the second substrate SUB2 and a column spacer (not shown) for maintaining a cell gap of the liquid crystal cell.

Polarizing plates POL1 and POL2 are attached to the outer surfaces of the first substrate SUB1 of the thin film transistor array TFTA and the second substrate SUB2 of the color filter array CFA respectively as shown in Fig. (Not shown) for setting the pre-tilt angle of the liquid crystal are formed on the inner surfaces of the first and second substrates SUB1 and SUB2, respectively.

Next, the operation of the touch sensor integrated type display apparatus according to the embodiment of the present invention will be described with reference to FIG. 2 and FIG.

2 and 3, the gate driving unit 13 sequentially outputs gate pulses (or scan pulses) in the display mode under the control of the timing controller 11 and outputs the swing voltage of the output to the gate high voltage VGH. And the gate-low voltage VGL. The gate pulse output from the gate driver 13 is sequentially supplied to the gate lines G1 to Gm in synchronization with the data voltage output from the data driver 12. [ The gate high voltage VGH is a voltage equal to or higher than the threshold voltage of the thin film transistor TFT and the gate low voltage VGL is lower than the threshold voltage of the thin film transistor TFT. The gate driving ICs (Integrated Circuits) of the gate driver 13 are connected to the gate lines G1 to Gm formed on the first substrate SUB1 of the thin film transistor array TFTA through a TAP (Tape Automated Bonding) process May be formed directly on the first substrate SUB1 of the thin film transistor array TFTA together with the pixels in a GIP (Gate In Panel) process.

The data driver 12 samples and latches the digital video data RGB under the control of the timing controller 11. [ The data driver 12 inverts the polarity of the data voltage of the digital video data RGB based on the positive / negative polarity gamma compensation voltages GMA1 to GMAn supplied from the power supply unit 15, And outputs a voltage. The positive / negative polarity data voltage output from the data driver 12 is synchronized with the gate pulse output from the gate driver 13. [ Each of the source driver ICs (Integrated Circuits) of the data driver 12 may be connected to the data lines D1 to Dn of the display unit by a COG (Chip On Glass) process or a TAB (Tape Automated Bonding) process. The source driver IC may be integrated in the timing controller 11 and implemented as a one-chip IC together with the timing controller 11. [

The timing controller 11 controls the operation timing of the gate driver 13, the data driver 12 and the touch recognition processor 17 using the timing signals required for driving the display device supplied from the external host controller 10 Lt; / RTI > The timing control signals for controlling the operation timings of the gate driver 13 and the data driver 12 include a gate timing control signal for controlling the operation timing of the gate driver 13 and an operation timing of the data driver 12, And a data timing control signal for controlling the polarity of the voltage. The timing control signals for controlling the operation timing of the touch recognition processor 17 include a touch timing control signal for controlling the operation timing of the touch recognition processor 17. [

The gate timing control signal includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GOE), and the like. The gate start pulse GSP is applied from the gate driver 13 to the first gate driver IC which outputs the first gate pulse every frame period to control the shift start timing of the gate driver IC. The gate shift clock GSC is a clock signal commonly input to the gate driving ICs of the gate driver 13 to shift the gate start pulse GSP. The gate output enable signal GOE controls the output timing of the gate driving ICs of the gate driver 13. [

The data timing control signal includes a source start pulse (SSP), a source sampling clock (SSC), a polarity control signal (POL), and a source output enable signal (SOE) . The source start pulse SSP is applied to the first source driving IC which samples the data first in the data driver 12 to control the data sampling start timing. The source sampling clock SSC is a clock signal that controls the sampling timing of data in the source driving ICs on the basis of the rising or falling edge. The polarity control signal POL controls the polarity of the data voltage output from the source driver ICs. The source output enable signal SOE controls the output timing of the source driving ICs. the source start pulse SSP and the source sampling clock SSC may be omitted if digital video data RGB is input to the data driver 12 through the mini LVDS interface.

The power supply unit 15 includes a DC-DC converter including a PWM (Pulse Width Modulation) modulation circuit, a boost converter, a regulator, a charge pump, a voltage divider circuit, and an operational amplifier (DC-DC converter). The power supply unit 15 adjusts an input voltage from the host controller 10 and supplies it to the liquid crystal display panel LCP, the data driver 12, the gate driver 13, the timing controller 11, the backlight unit And the touch recognition processor 17, as shown in Fig.

The power supplies supplied from the power supply unit 15 are connected to the high voltage source V DD and the high voltage source V DD via the high voltage source VDD, the gate high voltage VGH, the gate low voltage VGL, the common voltage Vcom, VGMAn, a touch driving voltage Vtsp, and the like. The common voltage Vcom among these voltages is supplied to all the common electrodes COM under the control of the host controller 10 during display driving. The common voltage Vcom may be supplied to all the common electrodes COM under the control of the timing controller 11. [ On the other hand, the touch driving voltage Vtsp is supplied to the first touch electrodes Tx1 to TXx under the control of the host controller 10 during touch driving. The touch driving voltage Vtsp may be supplied to the first touch electrodes Tx1 to TXx under the control of the timing controller 11. [ Also, in the embodiment of the present invention, the touch driving voltage Vtsp is shown to be supplied to the first touch electrodes Tx1 to TXx through the power supply unit 15, but the present invention is not limited thereto. For example, the touch driving voltage Vtsp may be supplied to the first touch electrodes Tx1 to TXx through the touch recognition processor 17 controlled by the host controller 10 or the timing controller 11. [

The host controller 10 converts the digital video data RGB of the input video and the timing signals Vsync, Hsync, DE and MCLK necessary for driving the display into an LVDS interface (Low Voltage Difference Signaling), a Transition Minimized Differential Signaling (TMDS) To the timing controller 11 via an interface such as an interface. The host controller 10 also generates a control signal Vin so that the same common voltage Vcom can be supplied to the plurality of divided common electrodes COM at the time of the display driving for displaying an image on the screen of the liquid crystal display device And supplies the control signal Vin to the power supply unit 15 so that the touch driving voltage Vtsp may be supplied to the first touch electrodes Tx1 to TXx during the touch operation for touch recognition. .

The touch recognition processor 17 differentially amplifies the voltage of the initial full capacitance of each of the second touch electrodes RX1 to RXy and the voltage of the touch capacitance after touch and converts the result to digital data. Then, the touch recognition processor 17 determines the touch position where the touch is made based on the difference between the initial capacitance of each of the second touch electrodes RX1 to RXy and the capacitance measured after the touch using the touch recognition algorithm , And outputs the touch coordinate data indicating the touch position to the host controller 10.

As described above, the touch sensor integrated display device according to the embodiment of the present invention is operated by time-sharing one frame period in which one image is displayed with a display period and a touch period. That is, during the display period, the gate pulses are sequentially supplied to the gate lines, the data voltages are supplied from the data lines to display the screen, and the touch driving voltage is applied to the grouped gate lines (first touch electrodes) And the grouped data lines (second touch electrodes) sense a change in mutual capacitance formed between the first touch electrodes and the first touch electrodes.

In the touch sensor integrated type display device according to the above-described embodiment of the present invention, it is not necessary to separately form touch electrodes for touch sensing in the pixel region, but also a common electrode is divided and a separate wiring It is not necessary to form the film. Therefore, not only unnecessary processes are omitted, but also the parasitic capacitance caused by the unnecessary wiring formed in the pixel region can be removed, so that the deterioration of the image quality can be prevented and the effect of improving the touch sensitivity can be obtained have.

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. For example, the first direction and the second direction described in the embodiment of the present invention can be changed in opposite directions, and the gate lines can be changed to the second touch electrode, the data lines can be changed to the first touch electrode It is also possible to do. Further, the unit for grouping the gate lines or the data lines is not limited to the specific number described in the description of the embodiment. Although the touch sensor integrated type liquid crystal display device has been described as an example in the description of the embodiments, the present invention is also applicable to other display devices. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the invention but should be defined by the claims.

10: Host controller 11: Timing controller
12: Data driver 13: Gate driver
15: power supply unit 17: touch recognition processor
GL, G1 to Gm: gate line DL, D1 to Dn: data line
TCL1 to TCLx: First connection wiring RCL1 to RCLy: Second connection wiring
TX1 to TXx: first touch electrodes RX1 to RXy: second touch electrodes
TW1 to TWx: first routing wiring RW1 to RWy: second routing wiring

Claims (6)

A plurality of gate lines and a plurality of data lines arranged to cross each other;
A plurality of pixel electrodes disposed in a region defined by the intersection of the plurality of gate lines and the data lines, respectively; And
And a common electrode disposed opposite to the plurality of pixel electrodes,
Wherein the plurality of gate lines are grouped into at least two units to constitute a plurality of first touch electrodes,
Wherein the plurality of data lines are grouped into at least two units to constitute a plurality of second touch electrodes.
The method according to claim 1,
Gate pulses are sequentially supplied to the gate lines during a display period constituting a part of one frame period to supply a data signal to the plurality of pixel positive electrodes through the data lines, The touch driving voltage is supplied to the plurality of touch electrodes of the plurality of first touch electrodes and the plurality of second touch electrodes and the remaining one plurality of touch electrodes are sensed And the touch sensor integrated type display device.
The method according to claim 1,
Further comprising a plurality of first connection wirings connecting the plurality of gate lines in at least two units and a plurality of second connection wirings connecting the plurality of data lines in at least two units. Integrated display device.
The method of claim 3,
The plurality of gate lines and the plurality of first connection wirings are formed on the substrate,
Wherein the plurality of data lines and the plurality of second connection wirings are formed on the gate insulating layer.
5. The method of claim 4,
Wherein the plurality of pixel electrodes are formed on the gate insulating film, and are disposed apart from the plurality of data lines and the plurality of second connection wirings.
The method of claim 3,
Further comprising first routing wires connecting the plurality of first connection wires to the touch sensor processor respectively and a plurality of second routing wires connecting the plurality of second connection wires to the touch processor, The touch sensor integrated type display device.

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