KR101862397B1 - Touch sensor integrated type display - Google Patents

Abstract

A display device with a built-in touch sensor according to the present invention includes: a plurality of gate lines formed on a substrate; A plurality of Tx electrode lines formed in a direction parallel to the gate lines; A plurality of data lines formed on the gate lines so as to intersect the gate lines with a first insulating film therebetween; A plurality of pixel electrodes connected to the data lines through respective TFTs; And a plurality of common electrode patterns patterned on the pixel electrodes with a second insulating film interposed therebetween and functioning as common electrodes in the display period and functioning as Rx electrode lines in the touch sensor driving period; A first capacitance is formed between the pixel electrode and the Tx electrode line in the touch sensor driving period, a second capacitance is formed between the pixel electrode and the common electrode pattern, The third electrostatic capacitance is formed in the second electrode.

Description

{TOUCH SENSOR INTEGRATED TYPE DISPLAY}

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

User input means has been replaced with a touch screen in a button-type switch in accordance with the trend of lightening and slimming of household appliances and portable information devices. A touch screen applied to a display device includes a plurality of touch sensors. The touch sensors may be embedded in the display panel in an in-cell type or may be coupled to the display panel. As the touch sensor of the in-cell type, a capacitive type which senses the position where the capacitance change has occurred and senses the touched portion is widely used.

The capacitive touch sensors include a plurality of driving electrode lines (hereinafter, referred to as Tx electrode lines) and a plurality of sensing electrode lines (hereinafter, referred to as Rx electrode lines) formed to intersect with each other .

In the conventional capacitance method, the display panel is constituted by a liquid crystal display panel and the common electrode formed on the liquid crystal display panel is patterned in the horizontal direction as shown in Figs. 1 and 2 to form Tx electrode lines T1, T2 and T3 Rx electrode lines R1, R2 and R3 are formed by patterning the common electrode in the vertical direction orthogonal to the horizontal direction and then the Tx electrode lines T1, T2 and T3 and the Rx electrode lines R1 , R2, R3) of the mutual capacitance.

Each of the Tx electrode lines T1, T2 and T3 in the prior art includes a plurality of transparent conductive block patterns T1 and a plurality of link patterns for electrically connecting the transparent conductive block patterns T1 adjacent in the horizontal direction L). The size of each of the transparent conductive block patterns T1 is larger than the size of each of the pixels. Each of the transparent conductive block patterns T1 overlaps the pixels with the insulating film therebetween, and is patterned with a transparent conductive material such as ITO (Indium Tin Oxide). The link patterns L electrically connect the horizontally adjacent transparent conductive block patterns T1 across the Rx electrode lines R1, R2, and R3. The link patterns L overlap the Rx electrode lines R1, R2, and R3 with the insulating film interposed therebetween. The link patterns L are patterned with an opaque metal having a high electrical conductivity.

In the prior art, the Rx electrode lines R1, R2, and R3 are patterned along the vertical direction between the horizontally adjacent transparent conductive block patterns T1. The Rx electrode lines R1, R2, and R3 are formed of a transparent conductive material such as ITO, each of which overlaps with a plurality of pixels (not shown).

Such conventional inscell type touch sensors have the following problems.

First, since the common electrode of the display panel is divided in the horizontal and vertical directions in the prior art, display unevenness tends to occur for each touch unit (Tx electrode lines and Rx electrode lines).

Secondly, in the prior art, the amount of change in mutual capacitance between the Tx electrode lines and the Rx electrode lines is sensed.

Third, in the prior art, separate link patterns are required to form the Tx electrode lines. Link patterns formed through additional contact hole processes complicate the process and reduce the transmittance.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a touch sensor built-in display device which alleviates display unevenness per touch unit, increases the size of a sensing signal, simplifies the process and prevents a decrease in transmittance.

According to an aspect of the present invention, there is provided a touch sensor built-in type display device including: a plurality of gate lines formed on a substrate; A plurality of Tx electrode lines formed in a direction parallel to the gate lines; A plurality of data lines formed on the gate lines so as to intersect the gate lines with a first insulating film therebetween; A plurality of pixel electrodes connected to the data lines through respective TFTs; And a plurality of common electrode patterns patterned on the pixel electrodes with a second insulating film interposed therebetween and functioning as common electrodes in the display period and functioning as Rx electrode lines in the touch sensor driving period; A first capacitance is formed between the pixel electrode and the Tx electrode line in the touch sensor driving period, a second capacitance is formed between the pixel electrode and the common electrode pattern, The third electrostatic capacitance is formed in the second electrode.

The plurality of Tx electrode lines are electrically connected and grouped by a plurality of Tx electrode lines; During the touch sensor driving period, the touch driving pulses sequentially swinging between the first driving voltage and the ground voltage are sequentially applied to the Tx electrode line groups.

A common voltage is applied to the plurality of common electrode patterns during the display period, and a touch reference voltage is applied during the touch sensor driving period.

Each of the plurality of common electrode patterns is patterned to correspond to a plurality of pixels and is vertically opposed to the plurality of Tx electrode lines.

The plurality of Tx electrode lines may be formed on the same layer as the gate lines, or may be disposed on the data lines with a third insulating film therebetween, so as to face the pixel electrodes.

A plurality of gate and Tx electrode lines formed on a substrate and functioning as gate lines in a display period and functioning as Tx electrode lines in a touch sensor driving period; A plurality of data lines formed to cross the gate and Tx electrode lines on the gate and Tx electrode lines with the first insulating film therebetween; A plurality of pixel electrodes connected to the data lines through respective TFTs; And a plurality of common electrode patterns patterned on the pixel electrodes with a second insulating film interposed therebetween and functioning as common electrodes in the display period and functioning as Rx electrode lines in the touch sensor driving period; A first capacitance is formed between the pixel electrode and the gate & tx electrode line in the touch sensor driving period, a second capacitance is formed between the pixel electrode and the common electrode pattern, And a third electrostatic capacitance is formed between the first electrode and the second electrode.

The display device with a built-in touch sensor according to the present invention can alleviate the display unevenness per touch unit, increase the size of the sensing signal, simplify the process, and prevent the transmittance from deteriorating.

1 is a plan view showing a conventional touch sensor of an inscell type.
FIG. 2 is a cross-sectional view taken along the line I-I 'of FIG. 1; FIG.
3 is a block diagram showing a touch sensor built-in display device according to an embodiment of the present invention.
4 is a plan view showing a pixel structure of a touch sensor built-in display device according to an embodiment of the present invention.
5 is a cross-sectional view taken along line A-A 'of FIG. 4;
FIG. 6 is a cross-sectional view taken along line B-B 'of FIG. 4; FIG.
7 is an equivalent circuit diagram of Fig.
8 is a view showing a pixel equivalent circuit at the time of non-touch in the touch sensor driving period.
9 is a view showing a pixel equivalent circuit at the time of touch in the touch sensor driving period.
10 is an equivalent circuit diagram of a pixel array including Tx electrode lines sequentially driven in groups.
Fig. 11 is a view showing an example of utilization of a common electrode in touch sensing as a panel structure corresponding to the equivalent circuit of Fig. 10; Fig.
12 is a waveform diagram showing driving signals of a touch sensor built-in display device according to an embodiment of the present invention;
13 is a graph showing output characteristics of a touch sensor built-in display device according to an embodiment of the present invention.
FIG. 14 is a block diagram showing a touch sensor built-in display device according to another embodiment of the present invention; FIG.
15 shows an equivalent circuit of a pixel array including a switch array for driving gate & tx electrode lines differently in a display period and a touch sensor driving period.
16 is a waveform diagram showing driving signals of a touch sensor built-in display device according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 3 to 16. FIG. The touch sensor built-in type display device of the present invention can be implemented by a liquid crystal display (LCD) and touch sensors embedded in an insel type display panel of the liquid crystal display device.

3 to 13 relate to a touch sensor built-in display device according to an embodiment of the present invention. FIG. 3 shows a touch sensor built-in display device according to an embodiment of the present invention.

3, a touch sensor built-in type display device according to an embodiment of the present invention includes a display panel 10, a display data driving circuit 12, a display scan driving circuit 14, a touch sensor driving circuit 16, A touch sensor read-out circuit 18, a touch controller 20, a timing controller 22, and the like.

In the display panel 10, a liquid crystal layer is formed between two glass substrates. A plurality of gate lines G1 to Gn, n, which intersect the data lines D1 to Dm and a plurality of data lines D1 to Dm, m are positive integers, are connected to the lower substrate of the display panel 10, A plurality of thin film transistors (TFTs) formed at intersections of the data lines D1 to Dm and the gate lines G1 to Gn, a plurality of pixels A TFT array including electrodes, a storage capacitor connected to each pixel electrode to maintain the voltage of the liquid crystal cell, touch sensors, and the like are formed.

The touch sensors include Rx electrode lines intersecting with the gate lines G1 to Gn and Tx electrode lines T1 to Tn and Tx electrode lines T1 to Tn and parallel to the data lines D1 to Dm, (R1 to Ri, i is a positive integer smaller than m), and first to third capacitances. The Tx electrode lines T1 to Tn function as driving channels of the touch sensors during the touch sensor driving period. The Rx electrode lines R1 to Ri serve as common electrodes during the display period and serve as reception channels of the touch sensors during the touch sensor driving period. The first capacitance is formed between the Tx electrode line and the pixel electrode, the second capacitance is formed between the pixel electrode and the common electrode, the third capacitance is formed between the touching object (finger, conductive pen, etc.) As shown in FIG. The touch sensors sense whether or not they are touched by a change in the amount of charge accumulated in the read-out end of the Rx electrode lines (R1 to Ri) during the touch sensor driving period.

The pixels of the display panel 10 are formed in a pixel region defined by the data lines D1 to Dm and the gate lines G1 to Gn and arranged in a matrix form. The liquid crystal cells of each of the pixels are driven by an electric field applied in accordance with a voltage difference between a data voltage applied to the pixel electrode and a common voltage applied to the common electrode to control the amount of incident light. The TFTs are turned on in response to a scan pulse (gate pulse) from the gate lines G1 to Gn to supply a voltage from the data lines D1 to Dm to the pixel electrodes of the liquid crystal cell.

The upper glass substrate of the display panel 10 may be provided with a color filter array including a black matrix, a color filter, and the like. On the other hand, the lower glass substrate of the display panel 10 can be implemented as a COT (Color Filter On TFT) structure. In this case, the black matrix and the color filter can be formed on the lower glass substrate of the display panel 10. [

The common electrode is formed on the upper glass substrate in a vertical electric field driving method such as a TN (Twisted Nematic) mode and a VA (Vertical Alignment) mode and is driven by a horizontal electric field drive such as an In Plane Switching (IPS) mode and a Fringe Field Switching And is formed on the lower glass substrate together with the pixel electrode. The common electrode is patterned in a predetermined unit so as to also function as the Rx electrode lines (R1 to Ri). A common voltage is applied to the patterns of the common electrode during the display period and a touch reference voltage is applied to the patterns of the common electrode during the touch sensor driving period. The common voltage may be a voltage between 3V and 5V. During the touch sensor driving period, the patterns of the common electrode function as the Rx electrode lines (R1 to Ri).

On the upper glass substrate and the lower glass substrate of the display panel 10, a polarizing plate is attached and an alignment film for forming a pre-tilt angle of liquid crystal on the inner surface in contact with the liquid crystal is formed. A column spacer for maintaining a cell gap of the liquid crystal cell may be formed between the upper glass substrate and the lower glass substrate of the display panel 10. [

The display data driving circuit 12 includes a plurality of source drive ICs (Integrated Circuits). The source driver ICs output the analog video data voltage for a predetermined display period and output a specific DC voltage during the touch sensor driving period. Here, the specific DC voltage is a voltage capable of minimizing the variation of the voltage charged in the capacitances of the touch sensors during the touch sensor driving period. The specific DC voltage may be the voltage between the base voltage (0 V) and the common voltage. In the display period, the source drive ICs latch digital video data (RGB) input from the timing controller 22. The source drive ICs convert the digital video data (RGB) to an analog positive / negative gamma compensation voltage to output the analog video data voltage. The analog video data voltage is supplied to the data lines D1 to Dm.

The display scan driver circuit 14 includes one or more scan driver ICs. The scan driver IC sequentially supplies scan pulses synchronized with the analog video data voltages to the gate lines G1 to Gn under the control of the timing controller 22 during the display period to sequentially supply the lines of the display panel into which the analog video data voltages are written Select. The scan pulse is generated as a pulse swinging between the gate high voltage (VGH) and the gate low voltage (VGL). The display scan driving circuit 14 continuously supplies the gate line voltage VGL to the gate lines G1 to Gn without generating the scan pulse during the touch sensor driving period. Therefore, the gate lines G1 to Gn sequentially supply the scan pulse to the TFTs of the pixels during the display period to sequentially select the lines to which data is to be written in the display panel 10, and the gate low voltages VGL ). The gate high voltage VGH may be a voltage between approximately 18V and 20V, and the gate low voltage VGL may be a voltage between approximately 0V and -5V.

The touch sensor driving circuit 16 supplies a specific DC voltage to the Tx electrode lines T1 to Tn during the display period and applies a touch driving pulse to the Tx electrode lines T1 to Tn during the touch sensor driving period. During the touch sensor driving period, a plurality of Tx electrode lines (T1 to Tn) may be electrically connected and grouped. In this case, the touch sensor driving circuit 16 may scan the touch sensors by driving the Tx electrode lines sequentially in groups.

The touch sensor readout circuit 18 supplies the common voltage to the Rx electrode lines R1 to Ri during the display period and supplies the touch reference voltage to the Rx electrode lines R1 to Ri during the touch sensor driving period. The touch reference voltage may have the same level as the common voltage. The touch sensor readout circuit 18 amplifies the analog output (the amount of charge accumulated in the lead-out stage) of the touch sensors input through the Rx electrode lines R1 to Ri, converts the analog output into digital data in the HID format, 20).

The touch controller 20 analyzes the digital data input from the touch sensor docking circuit 18 using a preset touch recognition algorithm to calculate coordinate values. The coordinate value data of the touch position output from the touch controller 20 is transmitted to an external host system. The host system executes the application program indicated by the coordinate value of the touch position.

The timing controller 22 receives a timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, a data enable signal DE and a main clock MCLK from an external host system And generates timing control signals for controlling the operation timings of the display data driving circuit 12 and the display scan driving circuit 14. The timing control signal of the display scan driving circuit 14 includes a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE, Signal (DIR) and the like. The timing control signal of the display data driving circuit 12 includes a source sampling clock (SSC), a polarity control signal (POL), and a source output enable (SOE) signal.

The timing controller 22 generates timing control signals Ctx and Crx for controlling the operation timing of the touch sensor driving circuit 16 and the touch sensor docking circuit 18. [

The timing controller 22 controls the timing control signals to time-divide one frame period into a display period and a touch sensor driving period. For example, if one frame period is 1/60 second (16.67 msec), the timing controller 22 sets the display period to approximately 11 msec, and during the display period, the display data driving circuit 12 and the display scan driving circuit 14 to display video data on the pixels. The timing controller 22 sets the touch sensor driving period to 5.67 msec, and drives the touch sensor driving circuit 16 and the touch sensor docking circuit 18 during the touch sensor driving period to set the touch position for the touch sensors . The display period and the touch sensor driving period can be appropriately adjusted in consideration of the panel characteristics according to the type of the display panel 10. [

FIG. 4 shows a pixel structure of a touch sensor built-in display device according to an embodiment of the present invention. 5 is a cross-sectional view taken along the line A-A 'in FIG. 4, and FIG. 6 is a cross-sectional view taken along line B-B' in FIG. 5 and 6, 'SUB' represents a lower glass substrate.

4 to 6, one pixel structure of a touch sensor built-in display device according to an embodiment of the present invention is formed by joining a TFT array and a color filter array with a liquid crystal layer (not shown) interposed therebetween.

In the TFT array, gate lines GL and Tx electrode lines arranged in parallel with each other, gate lines GL on the first insulating film GI in between, and gate lines GL and Tx electrode lines on the Tx electrode lines A pixel electrode connected to the data line DL through the TFT, a common electrode disposed on the pixel electrode through the second insulating film PASI, and a TFT are formed. The gate electrode of the TFT is connected to the gate line GL, the source electrode thereof is connected to the data line DL, and the drain electrode thereof is connected to the pixel electrode. The pixel electrode may be formed on the same layer as the data line DL as shown in the figure. In this case, the drain electrode of the TFT can be directly contacted to the pixel electrode. Although not shown, the pixel electrode may be formed on the data line DL with a separate organic insulating film interposed therebetween to reduce the RC delay. In this case, the drain electrode of the TFT may be connected to the pixel electrode through the contact hole. The common electrode has a plurality of fringe holes at a portion overlapping the pixel electrode. A horizontal electric field is formed between the pixel electrode and the common electrode by these fringe holes.

In the color filter array, a black matrix, a color filter, and the like are formed. A polarizing plate (PO) is attached to the opposite surface of the color filter array not facing the TFT array.

The display device with built-in touch sensor according to an embodiment of the present invention further includes a Tx electrode line in parallel with the gate line GL. In the touch sensor driving period, The capacitance Cgp is formed and the second capacitance Cpc is formed between the pixel electrode and the common electrode and the third capacitance Cpf is formed between the object to be touched and the pixel electrode.

On the other hand, the Tx electrode line may be formed on the same layer as the gate line as shown in the drawing, and may be arranged on the data line DL with the third insulating film therebetween, .

According to the present invention, since the common electrode does not function as the Tx electrode line and the Rx electrode line but functions only as the Rx electrode line, the patterning size for the common electrode becomes larger (see R1 and R2 in FIG. 11) The display unevenness per touch unit is relaxed. In addition, since the Tx electrode line is formed in the same process in forming the gate line, the present invention eliminates the need for additional link patterns, thereby simplifying the process and preventing the decrease in transmittance due to the link patterns.

Fig. 7 is an equivalent circuit diagram of Fig. 4, Fig. 8 shows a pixel equivalent circuit at non-touch in the touch sensor driving period, and Fig. 9 shows a pixel equivalent circuit at the time of touch in the touch sensor driving period.

7 to 9, the common voltage Vcom is applied to the common electrode during the display period, while the touch reference voltage Vref is applied through the internal switch operation of the touch sensor dummy circuit in the touch sensor driving period . The touch driving pulse supplied to the Tx electrode line in the touch sensor driving period takes a pulse shape swinging between the first driving voltage and the ground voltage.

In this condition, as shown in FIG. 8, the amount of change (? Vp) of the pixel voltage and the amount of change (? Q) of charges accumulated in the lead-out stage at the time of non-

In Equation (1), Vg1 indicates the first driving voltage drv1 in Fig. 12 and may be higher than a specific DC voltage, for example, 5V. Vg2 is 0V indicating the ground voltage (GND) in Fig. Vp 'indicates the pixel voltage when the first driving voltage Vg1 is applied to the Tx electrode line, and Vp indicates the pixel voltage when the ground voltage Vg2 is applied to the Tx electrode line.

As shown in FIG. 9, the amount of change (? Vp) of the pixel voltage upon touch and the amount of change (? Q) of the charge accumulated in the lead-out stage are shown in the following Equation (2).

In Equation (2), Vg1 indicates the first driving voltage drv1 in Fig. 12 and may be a voltage higher than the specific DC voltage, for example, 5V. Vg2 is 0V indicating the ground voltage (GND) in Fig. Vp 'indicates the pixel voltage when the first driving voltage Vg1 is applied to the Tx electrode line, and Vp indicates the pixel voltage when the ground voltage Vg2 is applied to the Tx electrode line.

The touch sensor built-in type display device according to an embodiment of the present invention senses whether or not it is touched due to a change in the amount of charge accumulated in the lead-out stage depending on the presence or absence of a touch. The present invention does not detect whether a touch is caused by a change in mutual capacitance according to a horizontal electric field, but detects whether or not the touch is caused by a change in capacitance according to a vertical electric field as described above. In order to solve the problem that the size of the sensing signal is small due to a small amount of change in capacity in the related art, the present invention can scan the touch sensors by grouping a plurality of Tx electrode lines and sequentially driving Tx electrode lines in groups have.

FIG. 10 shows an equivalent circuit of a pixel array including Tx electrode lines sequentially driven in groups. FIG. 11 is a panel structure corresponding to the equivalent circuit of FIG. 10, showing an example of utilization of a common electrode in touch sensing.

The capacitance at which one pixel electrode and the touch object are formed is actually a small value. However, when a plurality of Tx electrode lines are electrically connected and driven simultaneously as shown in FIG. 10, the common electrodes are patterned to correspond to a plurality of pixels as shown in FIG. 11, and the sensing signals are read through the common electrode patterns, The capacitance value constituting the sensing signal is greatly increased. In FIGS. 10 and 11, the case where three Tx electrode lines are simultaneously driven is shown as an example, but the present invention is not limited thereto.

12 is a waveform diagram showing driving signals of a touch sensor built-in display device according to an embodiment of the present invention.

12, a touch sensor built-in type display device according to an embodiment of the present invention includes a display panel 10 having touch sensors built therein by time-dividing one frame period into a display period P1 and a touch sensor driving period P2, .

During the display period P1, positive / negative analog video data voltages are supplied to the data lines D1 to D4 and scan pulses synchronized with the data voltages are supplied to the gate lines G1 to Gn. The specific DC voltage Vdc is supplied to the Tx electrode line groups Tg1 to Tgk and k is a positive integer smaller than n and the common voltage Vcom is supplied to the Rx electrode lines R1 to Ri.

During the touch sensor driving period P2, a specific direct-current voltage Vdc is supplied to the data lines D1 to D4 and a gate-low voltage VGL is supplied to the gate lines G1 to Gn. The Tx electrode line groups Tg1 to Tgk are sequentially supplied with the touch driving pulses of the first driving voltage Vdrv1 during the touch sensor driving period P2. The Rx electrode lines R1 to Ri are supplied with the touch reference voltage Vref during the touch sensor driving period P2. If the same specific DC voltage Vdc is supplied to all the data lines D1 to D4 during the touch sensor driving period P2 as shown in FIG. 12, the noise components mixed into the sensing signal through the signal line connected to the pixels Can be minimized.

During the touch sensor driving period P2, the touch reference voltage Vref supplied to the Rx electrode lines R1 to Ri is applied. The present invention sequentially applies a touch driving pulse to the Tx electrode line groups Tg1 to Tgk and detects whether or not the touch is applied based on a change in the amount of charge of the Rx electrode lines R1 to Ri. When a constant touch reference voltage Vref is applied to the Rx electrode lines R1 to Ri, the capacitance of the capacitance is changed by the pulsing of the Tx electrode line groups Tg1 to Tgk, So that the amount of charge accumulated in the lead-out ends of the Rx electrode lines R1 to Ri is changed. In this process, the change of the Rx lines R1 to Ri can be detected.

When the touch reference voltage Vref is applied to the Rx electrode lines R1 to Ri, the Rx electrode lines R1 to Rj are turned on before the touch driving pulse is applied to the Tx electrode line groups Tg1 to Tgk And charges are charged by the touch reference voltage Vref. When the voltage of the Tx electrode line groups Tg1 to Tgk swings due to pulsing of the Tx electrode line groups Tg1 to Tgk, the amount of charge of the Rx electrode lines R1 to Ri also changes. When the potential of the Tx electrode line groups Tg1 to Tgk is lowered to the ground voltage GND, the charge of the Rx electrode lines R1 to Ri is restored to the state before the touch driving pulse is applied. Then, the change in the charge amount of the Rx electrode lines (R1 to Ri) can be detected by the amount of change in the charge amount caused by the change in the capacitance.

13 is a graph showing output characteristics of a touch sensor built-in display device according to an embodiment of the present invention.

From the above equation (2), the amount of change (? Q) of the charge accumulated in the lead-out stage is calculated as shown in the graph of FIG. 13, when the first driving voltage Vg1 is 5V, the first capacitance Cgp is 50fF, and the capacitance Cgc between the lead-out end and the Tx electrode line is 50fF, a variation of about 0.5 pC is generated . It is a sufficiently measurable value when the amount of change of charge (Q) accumulated in the lead-out stage is about 0.5 pC. The number of pixels used in the calculation was 9700 based on a touch unit of 4.5 mm in width and 4.5 mm in height on a resolution 330 ppi (pixel per inch) display.

14 to 16 relate to a touch sensor built-in display device according to another embodiment of the present invention.

FIG. 14 shows a touch sensor built-in display device according to another embodiment of the present invention. Fig. 15 shows an equivalent circuit of a pixel array including a switch array for driving gate & tx electrode lines differently in the display period and the touch sensor driving period. 16 is a waveform diagram showing driving signals of a touch sensor built-in display device according to another embodiment of the present invention.

14 through 16, a touch sensor built-in display device according to another embodiment of the present invention includes a display panel 100, a display data driving circuit 120, an integrated driving circuit 140, a switch array 160, A touch sensor readout circuit 180, a touch controller 200, a timing controller 220, and the like.

A plurality of gate and Tx electrode lines GT1 to GTn functioning as gate lines in the display period P1 and functioning as Tx electrode lines in the touch sensor driving period P2 are formed in the display panel 100. [ Accordingly, the touch sensors include Rx electrode lines R1 to Ri, which intersect the gate & Tx electrode lines GT1 to GTn, the gate and Tx electrode lines GT1 to GTn, and the data lines D1 to Dm, , And first to third capacitances. The first capacitance is formed between the gate and the Tx electrode line and the pixel electrode, the second capacitance is formed between the pixel electrode and the common electrode, the third capacitance is the capacitance between the touching object (finger, conductive pen, etc.) . The touch sensors sense whether or not they are touched by a change in the amount of charge accumulated in the read-out end of the Rx electrode lines R1 to Ri during the touch sensor driving period P2. Other configurations of the other display panels 100 are substantially the same as those described in the above embodiment.

The integrated driving circuit 140 functions as a display scan driving circuit in the display period P1 and as a touch sensor driving circuit in the touch sensor driving period P2.

The integrated driving circuit 140 sequentially applies a scan pulse swinging between the gate high voltage VGH and the gate low voltage VGL to the gate and Tx electrode lines GT1 to GTn in the display period P1 as shown in FIG. And selects the line of the display panel in which the analog video data voltage is written. The integrated driving circuit 140 swings between the second driving voltage Vdrv2 and the gate low voltage VGL to each group of the gate and Tx electrode lines GT1 to GTn grouped in the touch sensor driving period P2 The touch sensors can be scanned by sequentially supplying the touch driving pulses. Here, when the TFTs of the display panel 100 are implemented in n-type, the second driving voltage Vdrv2 is set so that the TFTs of the display panel 100 are continuously turned off during the touch sensor driving period P2 Should be applied at a level lower than the gate-low voltage (VGL). And the second drive voltage Vdrv2 may be -10 V when the gate low voltage VGL is set to -5V.

16, the voltage supplied to the data lines D1 to D4 and the voltage supplied to the Rx electrode lines R1 to Ri in the display period P1 and the touch sensor driving period P2, respectively, Are substantially the same as those described in the embodiment.

The switch array 160 includes a plurality of first switches S1 connected between the scan pulse output terminals of the integrated driver circuit 140 and the gate and Tx electrode lines GT1 to GTn as shown in FIG. 15, And a plurality of second switches S2 connected between the touch driving pulse output terminals of the driving unit 140 and the gate & Tx electrode lines GT1 to GTn grouped. The first switches S1 switch the current path between the scan pulse output terminals and the gate & Tx electrode lines GT1 to GTn in response to the first switch control signal CS1 from the timing controller 220. [ The second switches S2 switch the current path between the drive pulse output terminals and the grouped gate & Tx electrode lines GT1 to GTn in response to the second switch control signal CS2 from the timing controller 220 . The first switch control signal CS1 is generated at the turn-on level in the display period P1 and turns on the first switches S1 at the same time and is generated at the turn-off level in the touch sensor drive period P2, Turns off the switches S1 at the same time. On the other hand, the second switch control signal CS2 is generated at the turn-off level in the display period P1 and simultaneously turns off the second switches S2, and is generated at the turn-on level in the touch sensor drive period P2 And simultaneously turns on the second switches S2.

The switch array 160 may be formed as a driver IC with the integrated driver circuit 140 and then attached to the display panel 100 or formed directly on the non-display area of the display panel 100 together with the integrated driver circuit 140 .

The touch sensor readout circuit 180, the touch controller 200, and the timing controller 220 are substantially the same as those described in the above embodiment.

The display device with a touch sensor according to another embodiment of the present invention mitigates display unevenness by each touch unit and increases the size of a sensing signal, but also functions as gate lines and Tx electrode lines using gate & Tx electrode lines By reducing the number of signal lines, the process can be further simplified as compared with the first embodiment, and the transmittance can be further increased.

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. 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 defined by the claims.

10, 100: display panel 12, 120: display data drive circuit
14: Display scan driver circuit 18,180: Touch sensor driver circuit
20,200: Touch controller 22,220: Timing controller
140: Integrated driving circuit 160: Switch array
Cgp, Cpc, Cpf: Capacitance

Claims (11)

A plurality of gate lines formed on a substrate;
A plurality of Tx electrode lines formed in a direction parallel to the gate lines;
A plurality of data lines formed on the gate lines so as to intersect the gate lines with a first insulating film therebetween;
A plurality of pixel electrodes connected to the data lines through respective TFTs; And
A plurality of common electrode patterns patterned on the pixel electrodes with a second insulating film interposed therebetween and functioning as a common electrode in a display period and functioning as an Rx electrode line in a touch sensor driving period;
The plurality of Tx electrode lines may be formed on the same layer as the gate lines or may be disposed on the data lines with a third insulating film therebetween,
A first capacitance is formed between the pixel electrode and the Tx electrode line in the touch sensor driving period, a second capacitance is formed between the pixel electrode and the common electrode pattern, And the third capacitance is formed in the second electrode. The method according to claim 1,
The plurality of Tx electrode lines are electrically connected and grouped by a plurality of Tx electrode lines;
And a touch driving pulse sequentially swinging between a first driving voltage and a ground voltage is sequentially applied to the Tx electrode line groups during the touch sensor driving period. The method according to claim 1,
Wherein a common voltage is applied to the plurality of common electrode patterns during the display period and a touch reference voltage is applied during the touch sensor driving period. The method according to claim 1,
Wherein each of the plurality of common electrode patterns is patterned to correspond to a plurality of pixels and is vertically opposed to the plurality of Tx electrode lines. delete A plurality of gate and Tx electrode lines formed on the substrate and functioning as a gate line in a display period and functioning as a Tx electrode line in a touch sensor driving period;
A plurality of data lines formed to cross the gate and Tx electrode lines on the gate and Tx electrode lines with the first insulating film therebetween;
A plurality of pixel electrodes connected to the data lines through respective TFTs; And
A plurality of common electrode patterns patterned on the pixel electrodes with a second insulating film interposed therebetween and functioning as common electrodes in the display period and functioning as Rx electrode lines in the touch sensor driving period;
A first capacitance is formed between the pixel electrode and the gate & tx electrode line in the touch sensor driving period, a second capacitance is formed between the pixel electrode and the common electrode pattern, And a third capacitance is formed between the first electrode and the second electrode. The method according to claim 6,
A scan driver for sequentially supplying a scan pulse swinging between a gate high voltage and a gate low voltage to the gate and Tx electrode lines in the display period and for applying a second pulse to each group of the gate and Tx electrode lines, And an integrated driving circuit for sequentially supplying a touch driving pulse swinging between a driving voltage and the gate low voltage. 8. The method of claim 7,
And the second driving voltage is applied at a level lower than the gate low voltage. 8. The method of claim 7,
A plurality of first switches connected between the scan pulse output terminals of the integrated driving circuit and the gate and Tx electrode lines and a plurality of first switches connected between the groups of the gate drive and Tx electrode lines, A plurality of second switches connected in parallel;
The first switches electrically connecting the scan pulse output terminals and the gate and Tx electrode lines in response to a first switch control signal input at a turn-on level in the display period;
And the second switches electrically connect the driving pulse output terminals and the groups of the gate and Tx electrode lines in response to a second switch control signal input at a turn-on level in the touch sensor driving period. Display with integrated sensor. The method according to claim 6,
Wherein a common voltage is applied to the plurality of common electrode patterns during the display period and a touch reference voltage is applied during the touch sensor driving period. The method according to claim 6,
Wherein each of the plurality of common electrode patterns is patterned to correspond to a plurality of pixels and is vertically opposed to the plurality of gate and Tx electrode lines.

Images