KR101862393B1 - Display having touch sensor - Google Patents

Abstract

A display device having a touch sensor according to the present invention includes a plurality of driving electrode lines functioning as driving channels; A plurality of receiving electrode lines which function as receiving channels intersecting with the driving electrode lines and which implement touch sensors by combining the driving channels with a plurality of channel combinations; A touch sensor driving circuit for generating a touch sensor driving pulse differently for each of the channel combinations or the driving channels and supplying the same to the driving electrode lines; And a touch sensor readout circuit for sampling the touch sensors through the reception electrode lines and converting the sampled touch sensors into digital touch data.

Description

DISPLAY HAVING TOUCH SENSOR [0002]

The present invention relates to a display device having a touch sensor.

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. The touch sensors of the in-cell type are known as resistive type, capacitive type, and electro magnetic type. Among them, particularly, A capacitive sensing method is widely used.

The capacitive touch sensors include a plurality of driving electrode lines Tx and a plurality of receiving electrode lines Rx formed to intersect with each other. A mutual capacitor (Cm) is generated at the intersection of the driving electrode line Tx and the receiving electrode line Rx as shown in FIG. 1A. When the finger touches the touch sensor as shown in FIG. 1B, the electric field between the electrode lines Tx and Rx is partially blocked and the charged amount of the mutual capacitor Cm is lowered. Therefore, the display device having the touch sensor can recognize the touch by measuring the change in the charged amount of the mutual capacitor Cm before and after the touch.

In recent years, the size of the touch screen including the touch sensors has been increased, and the repetitive sensing has been required many times per touch frame for more accurate sensing, so that the response speed of the touch has become a big issue. It is known that the touch frame rate required for a smooth touch response is at least 60 Hz.

As the size of the touch screen increases, the number of driving channels (driving electrode lines) and receiving channels (receiving electrode lines) for constituting the touch sensors is increased, so that the number of sensing points, which are their intersections, also increases. In the touch screen, the time constants are different for each channel. The time constant is an indicator of how quickly or slowly the input can respond to the input and is proportional to the line resistance of the channel multiplied by the capacitance. The smaller the time constant, the faster the response. On the other hand, the larger the time constant, the slower the response. On a touch screen, a short channel has a small time constant and a long channel has a large time constant.

The charging and discharging characteristics of the driving pulse applied to the driving channel and the mutual capacitor for each channel are as shown in FIG. When the driving pulse of the high level H is applied to the driving electrode line Tx, the mutual capacitor Cm is charged and when the driving pulse of the low level L is applied to the driving electrode line Tx, Cm are discharged. The charge / discharge time of the mutual capacitor is proportional to the time constant. Therefore, if the path between the drive channel and the receive channel is long, the charge / discharge time of the mutual capacitor is long. On the contrary, if the path between the drive channel and the receive channel is short,

Assuming that the driving channels Ti, Tj, and Tk and the reception channels Ri, Rj, and Rk are arranged as shown in FIG. 3 to form channel combinations for generating the mutual capacitors Cm, It is the shortest. The channel combination corresponding to the path is Ti-Rk, the channel combination is Tj-Rj, and the channel combination corresponding to the path is Tk-Ri. If the drive pulses applied to the drive channels Ti, Tj and Tk are collectively matched to the maximum time constants of the path 1, that is, to the time constants of the Ti-Rk channel combination having the longest path as shown in Fig. 4A, The channel combinations are given sufficient time for charging, but the overall sensing time is increased and the touch frame rate is reduced. If the drive pulse applied to the drive channels Ti, Tj, and Tk is collectively matched to the minimum time constant of the path, that is, the time constant of the Tk-Ri channel combination having the shortest path as shown in FIG. 4B, The charging amount of other channel combinations having a long path is reduced, so that the sensing signal is weak and the touch performance is deteriorated.

In the prior art, drive pulses of the same period are applied to all the drive channels collectively regardless of the time constant for each channel combination. Accordingly, in the prior art, as described above, there is a problem that the amount of charge charged in the mutual capacitor is insufficient and the signal to noise ratio (SNR) is lowered, or the sensing time is increased and the touch frame rate is decreased.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a display device having a touch sensor capable of improving a touch frame rate by reducing a sensing time without deteriorating a touch performance.

According to an aspect of the present invention, there is provided a display device including a touch sensor including a plurality of driving electrode lines functioning as driving channels; A plurality of receiving electrode lines which function as receiving channels intersecting with the driving electrode lines and which implement touch sensors by combining the driving channels with a plurality of channel combinations; A touch sensor driving circuit for generating a touch sensor driving pulse differently for each of the channel combinations or the driving channels and supplying the same to the driving electrode lines; And a touch sensor readout circuit for sampling the touch sensors through the reception electrode lines and converting the sampled touch sensors into digital touch data.

The driving electrode lines and the receiving electrode lines cross each other and mutual capacitors are formed at the intersections.

Wherein the touch sensor driving circuit varies at least one of a period of the touch sensor driving pulse and a pulse width of a high level for each channel combination corresponding to a change in time constant depending on a sensing position where the mutual capacitor is formed, Channel combinations.

The high-level pulse width of the touch sensor driving pulse is increased in proportion to the distance between the intersection and the touch sensor driving circuit; The pulse width of the low level of the touch sensor drive pulse is increased in proportion to the distance between the intersection and the touch sensor readout path.

The touch sensor readout circuit sequentially samples each of the touch sensors located in the channel combinations a plurality of times.

The touch sensor driving circuit varies the period of the touch sensor driving pulse for each of the driving channels in accordance with the change in time constant depending on the sensing position where the mutual capacitors are formed.

The high-level pulse width of the touch sensor drive pulse is the same in the drive channels; The pulse width of the low level of the touch sensor drive pulse is increased in proportion to the distance between the intersection and the touch sensor readout path.

The touch sensor readout circuit samples the touch sensors existing on the same drive channel a plurality of times at the same time.

According to the present invention, the touch driving time can be optimally allocated to each channel to reduce unnecessary driving time to reduce the sensing time, thereby greatly improving the touch frame rate without deteriorating the touch performance. As the touch frame rate is improved, the touch response becomes faster and smoother.

FIGS. 1A and 1B are diagrams showing the operation of the capacitive touch sensors before and after touching. FIG.
FIG. 2 is a diagram showing charge / discharge characteristics of a drive pulse applied to a drive channel and a mutual capacitor according to a channel; FIG.
3 is a diagram illustrating an example of a channel combination configuration of a driving channel and a receiving channel for generating a mutual capacitor.
4 shows a problem when collectively applying the same drive pulse to all drive channels.
5 is a view illustrating a display device having a touch sensor according to an embodiment of the present invention.
Fig. 6 is an equivalent circuit diagram showing a part of a touch sensor and a pixel array formed on the display panel shown in Fig. 5; Fig.
7 is a view showing an example of driving channels and receiving channels formed on a display panel;
8A is a diagram showing experimental results on time constants for each position in a specific reception channel.
FIG. 8B is a diagram showing experimental results on the time constant for each position in a specific driving channel. FIG.
9 is a diagram showing channel combinations of a driving channel and a receiving channel for generating a mutual capacitor;
FIGS. 10 and 11 are diagrams illustrating at least one of a period of a touch sensor driving pulse and a pulse width of a high level for each channel combination according to the first exemplary embodiment of the present invention. FIG.
FIG. 12 is a diagram illustrating how a period of a touch sensor drive pulse varies for each drive channel according to a second embodiment of the present invention; FIG.
FIG. 13 is a graph showing a time required for one touch frame and a touch frame rate according to the present invention, respectively, in comparison with the related art.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 5 to 13. FIG.

The display device of the present invention can be applied to a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an organic light emitting display , OLED, electrophoresis (EPD), and the like, and touch sensors formed in the display panel of the flat panel display device or coupled to the display panel. Note that in the following embodiments, a liquid crystal display element is described as an example of a flat display element, but the display device of the present invention is not limited to a liquid crystal display element.

5 shows a display device having a touch sensor according to an embodiment of the present invention. 6 is an equivalent circuit diagram showing a part of the pixel array and touch sensors formed on the display panel shown in Fig.

5, a display device according to an exemplary embodiment of the present invention includes a display panel 100, a display data driving circuit 202, a display scan driving circuit 204, a touch sensor driving circuit 302, A touch sensor read-out circuit 304, a touch controller 306, a timing controller 400, and the like.

In the display panel 100, 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 100, A plurality of TFTs (TFT of FIG. 6) formed at the intersections of the data lines D1 to Dm and the gate lines G1 to Gn, liquid crystal cells (Clc A storage capacitor (Cst in FIG. 6), a touch sensor, etc., connected to the pixel electrode 11 to maintain the voltage of the liquid crystal cell, and the like do.

As shown in FIG. 6, the touch sensors intersect the driving electrode lines (T0 to Tj, j are positive integers smaller than n) and the driving electrode lines (T0 to Tj), which are parallel with the gate lines (G1 to Gn) And the intersection of the driving electrode lines T0 to Tj and the reception electrode lines R0 to Ri in parallel with the lines D1 to Dm and the reception electrode lines R0 to Ri, i being positive integers smaller than m, And a mutual capacitor (Cm) formed in the part. A touch sensor driving pulse for driving the touch sensor is supplied to the driving electrode lines T0 to Tj and a touch reference voltage is supplied to the receiving electrode lines R0 to Ri. The driving electrode lines T0 to Tj function as driving channels for applying a touch sensor driving pulse to the mutual capacitors Cm and the receiving electrode lines R0 to Ri serve as mutual capacitors Cm, And serves as receive channels for connecting readout circuitry 304. In FIG. 6, 'Tx' denotes any one of the driving electrode lines T0 to Tj, and 'Rx' denotes any one of the receiving electrode lines R0 to Ri.

The pixels of the display panel 100 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 the difference between the data voltage applied to the pixel electrode 11 and the common voltage Vcom applied to the common electrode 12 to control the amount of incident light . The TFTs are turned on in response to the gate pulse from the gate lines G1 to Gn to supply the voltage from the data lines D1 to Dm to the pixel electrode 11 of the liquid crystal cell.

The upper substrate of the display panel 100 may include a black matrix, a color filter, and the like. On the other hand, the lower glass substrate of the display panel 100 may be implemented as a COT (Color Filter On TFT) structure. In this case, the black matrix and the color filter may be formed on the lower glass substrate of the display panel 100. The common electrode 12 is formed on the upper glass substrate in a vertical electric field driving method such as TN (Twisted Nematic) mode and VA (Vertical Alignment) mode. And is formed on the lower substrate together with the pixel electrode 11 in the horizontal electric field driving system. The common voltage Vcom supplied to the common electrode 12 may be a DC voltage between 7V and 8V.

On the upper substrate and the lower substrate of the display panel 100, a polarizing plate is attached and an alignment film for forming a pre-tilt angle of the liquid crystal is formed on the inner surface in contact with the liquid crystal. A column spacer for maintaining a cell gap of the liquid crystal cell may be formed between the upper substrate and the lower substrate of the display panel 100.

The display data driving circuit 202 includes a plurality of source drive integrated circuits (ICs). The source drive ICs latch digital video data (RGB) input from the timing controller 400. 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 drive circuit 204 includes one or more scan drive ICs. The scan driver IC sequentially supplies the scan pulses (or gate pulses) synchronized with the analog video data voltages to the gate lines G1 to Gn under the control of the timing controller 400 to sequentially supply the analog video data voltages to the display panel Select the line. The scan pulse is generated as a pulse swinging between the gate high voltage and the gate low voltage. 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 -15V.

The touch sensor driving circuit 302 generates a touch sensor driving pulse based on the first touch sensor timing control signal Ctx applied from the outside and sequentially applies a touch sensor driving pulse to the driving electrode lines T0 to Tj , And the touch sensor driving pulses are repeated by repeating N (where N is a positive integer equal to or larger than 2) times to each of the driving electrode lines T0 to Tj. Therefore, after the touch sensor driving circuit 302 supplies the touch sensor driving pulse to the front driving electrode line (for example, Tj-2) N times or more, the touch sensor driving pulse is applied to the current driving electrode line Tj- N times or more, and then the touch sensor driving pulse is supplied to the next stage driving electrode line Tj N times or more. The touch sensor driving circuit 302 completes the touch scanning operation from the first driving electrode line T0 to the last driving electrode line Tj through this supplying method once. Thus, the time required for the touch sensor driving circuit 302 to complete the touch scanning operation once becomes one touch frame. The touch sensor driver circuit 302 may be implemented as a scan driver IC having substantially the same circuit configuration as the scan driver IC of the display scan driver circuit 204. The timing at which the touch sensor driving circuit 302 is operated may be overlapped with the timing at which the display scan driving circuit 204 is operated, or may be non-overlapping.

The touch sensor driving pulse supplied from the touch sensor driving circuit 302 is different for each channel combination for forming the mutual capacitor Cm or for each driving channel. 10 and 11, the touch sensor driving circuit 302 may be configured as shown in FIGS. 7, 8A, and 8B, taking into consideration that the time constant RC varies depending on the sensing position where the mutual capacitors Cm are formed. At least one of the period of the touch sensor drive pulse and the pulse width of the high level may be made different for each channel combination formed by the intersection of the input channel and the reception channel. In addition, considering that the time constant RC varies depending on the sensing position, the touch sensor driving circuit 302 may change the period of the touch sensor driving pulse for each driving channel as shown in FIG.

The touch sensor readout circuit 304 supplies a touch reference voltage to the reception electrode lines R0 to Ri based on the second touch sensor timing control signal Crx applied from the outside. The touch reference voltage may be set to a DC voltage higher than 0 V and 3 V or lower. The touch sensor readout circuit 304 samples and amplifies the analog output of the touch sensors input through the reception electrode lines R0 to Ri, that is, the charged amount of the mutual capacitor Cm, converts the analog output of the mutual capacitors Cm into digital touch data, Lt; / RTI > Here, the touch sensor readout circuit 304 repeatedly samples the output of each of the touch sensors N times in one touch frame by repeatedly supplying the touch sensor drive pulse N times.

The touch controller 306 stores the digital touch data repeatedly inputted N times from the touch sensor docking circuit 304 in the memory. The touch controller 306 calculates digital touch data repeatedly output N times from the same touch sensor, and reduces the noise components mixed in the digital touch data based on the calculation result. The touch controller 306 compares the digital touch data with reduced noise components with a predetermined reference value, and detects touch data of a reference value or more. The touch controller 306 analyzes the touch data of a reference value or more by a preset touch recognition algorithm and calculates coordinate values of the touch sensors. The coordinate value data of the touch position output from the touch controller 306 is transmitted to the external host system as touch digital touch data in the HID format. The host system executes the application program associated with the coordinate value of the touch location.

The timing controller 400 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 display timing control signals for controlling the operation timings of the display data driving circuit 202 and the display scan driving circuit 204. [ The timing control signal of the display scan driving circuit 204 includes a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (GOE) . The timing control signal of the display data driving circuit 202 includes a source sampling clock SSC, a polarity control signal POL and a source output enable signal SOE.

The timing controller 400 enables the output of the display data drive circuit 202 and the display scan drive circuit 204 during the display period to display the video data on the pixels. The timing controller 400 enables the output of the touch sensor driving circuit 302 during the touch sensor driving period and enables the touch sensor sampling circuit 304 to sample the touch signal. The display period and the touch sensor driving period may overlap or overlap with each other and may be appropriately adjusted in consideration of the panel characteristics depending on the type of the display panel 100. [

7 shows an example of the driving channels T0 to T20 and the reception channels R0 to R18 formed on the display panel 100. [ FIG. 8A shows experimental results of the time constant RC for each position in a specific receiving channel R 1 and FIG. 8B shows experimental results of the time constant RC for each specific driving channel T 20. As a table and a graph.

7, the reception channels R0 to R18 are arranged in the order of R0 to R18 according to the distance from the touch sensor driving circuit 302, and the driving channels T0 to T20 are arranged in the order of the touch sensor docking channel 304 In the order of T0 to T20.

8A, it can be seen that the time constant RC in the first receiving channel Rl is increased in proportion to the distance D between the point where the mutual capacitor is generated and the touch sensor docking channel 304. The receive path is longer at the point where it crosses T20 than the point that intersects T0 in the first receive channel (R1). As the receive path becomes longer, the time constant in the receive channel gradually increases. Thus, the time constant RC in the first receive channel Rl is the smallest at 90ns in the T0-R1 channel combination and the largest at 260ns in the T20-R1 channel combination.

8B, it can be seen that the time constant RC increases in proportion to the distance D between the point where the mutual capacitor is generated and the touch sensor driving circuit 302 in the 20th driving channel T20. The driving path is longer at the point where it crosses R18 than the point at which it crosses R0 in the twentieth driving channel T20. As the driving path becomes longer, the time constant in the driving channel gradually increases. Therefore, the time constant RC in the 20th driving channel T20 is the smallest at 80ns in the T20-R0 channel combination and 240ns in the T20-R18 channel combination.

9 shows channel combinations of the drive channels (Ta, Tb, Tc) and the receive channels (Ra, Rb, Rc) for generating the mutual capacitors Cm.

9, the " X " direction indicates a direction away from the touch sensor drive circuit, and the " Y " direction indicates a direction gradually departing from the touch sensor readout circuit. Therefore, the channel combinations formed by the intersections of the driving channels Ta, Tb, and Tc and the receiving channels Ra, Rb, and Rc have different lengths of signal transmission paths. In other words, the time constants of channel combinations are all different. The channel combination having the smallest time constants among the channel combinations is Tc-Ra, and the channel combination with the largest time constant is Ta-Rc.

10 and 11 illustrate that at least one of the period of the touch sensor driving pulse and the pulse width of the high level varies depending on the channel combination according to the first embodiment of the present invention.

Referring to FIG. 9, FIGS. 10 and 11 will be described as follows.

The channel combinations (Ta-Ra, Ta-Rb and Ta-Rc) constituted by the intersections of the drive channel Ta and the reception channels Ra, Rb and Rc have the same length , And the lengths of the drive signal transmission paths are different from each other. The channel combinations Tb-Ra, Tb-Rb and Tb-Rc constituted by the intersections of the driving channel Tb and the receiving channels Ra, Rb and Rc are arranged such that the length of the sensing signal- But the lengths of the drive signal transmission paths are different from each other. The channel combinations Tc-Ra, Tc-Rb and Tc-Rc constituted by the intersections of the driving channel Tc and the receiving channels Ra, Rb and Rc are arranged such that the length of the sensing signal- But the lengths of the drive signal transmission paths are different from each other.

In the first embodiment of the present invention, at least one of the period of the touch sensor driving pulse and the pulse width of the high level is made different for each channel combination in order to reduce the sensing time and improve the touch frame rate without deteriorating the touch performance.

To this end, the touch sensor driving circuit supplies a touch sensor drive pulse having a high level (H) of the first pulse width (H1) and a low level (L) of the first pulse width (L1) . The touch sensor driving circuit supplies the Ta-Rb channel combination with the high level H of the second pulse width H2 and the low level L of the first pulse width L1 larger than the first pulse width H1 in one cycle The touch sensor driving pulse can be applied. The touch sensor driving circuit supplies the Ta-Rc channel combination with the high level H of the third pulse width H3 which is wider than the second pulse width H2 and the low level L of the first pulse width L1 in one cycle The touch sensor driving pulse can be applied.

The touch sensor driving circuit supplies the Tb-Ra channel combination with the high level H of the first pulse width H1 and the low level L of the second pulse width L2 narrower than the first pulse width L1 in one cycle The touch sensor driving pulse can be applied. The touch sensor driving circuit can apply a touch sensor driving pulse having a high level (H) of the second pulse width H2 and a low level (L) of the second pulse width L2 to the combination of Tb-Rb channels have. The touch sensor drive circuit can apply a touch sensor drive pulse having a high level H of the third pulse width H3 and a low level L of the second pulse width L2 in one cycle to the Tb-Rc channel combination have.

The touch sensor driving circuit supplies the Tc-Ra channel combination with the high level H of the first pulse width H1 and the low level L of the third pulse width L3 narrower than the second pulse width L2 in one cycle The touch sensor driving pulse can be applied. The touch sensor drive circuit can apply a touch sensor drive pulse having a high level (H) of the second pulse width (H2) and a low level (L) of the third pulse width (L3) in one cycle to the Tc- have. The touch sensor driving circuit can apply a touch sensor driving pulse having a high level (H) of the third pulse width (H3) and a low level (L) of the third pulse width (L3) in one cycle to the Tc- have.

When the touch sensor driving pulse is applied in this manner, the time can be optimally distributed differently according to the time required for charging for each channel combination, so that the sensing time can be effectively reduced without deteriorating the touch performance. As described above, making at least one of the period of the touch sensor drive pulse and the pulse width of the high level different for each channel combination is effective for sequentially sampling each of the touch sensors corresponding to the channel combination in the touch sensor readout path .

FIG. 12 shows that the period of the touch sensor driving pulse varies for each driving channel according to the second embodiment of the present invention.

In the second embodiment of the present invention, in order to improve the touch frame rate by reducing the sensing time without deteriorating the touch performance, the pulse width of the high level of the touch sensor drive pulse is kept the same, do.

To this end, in the touch sensor driving circuit, a high level (H) of the fourth pulse width H4 and a low level (L) of the fourth pulse width L4 are applied to the Ta driving channel whose length is the first value It is possible to apply the touch sensor driving pulse in one period. The touch sensor driving circuit supplies a fifth pulse having a high level H of the fourth pulse width H4 and a fifth pulse L4 narrower than the fourth pulse width L4 to the Tb driving channel having a second value smaller than the first value, It is possible to apply the touch sensor drive pulse having the low level L of the width L5 as one period. The touch sensor driving circuit outputs a sixth pulse having a high level (H) of a fourth pulse width (H4) and a fifth pulse width (L5) smaller than a fifth pulse width (L5) in a Tc driving channel, The touch sensor drive pulse having the low level L of the width L6 as one period can be applied.

When the touch sensor driving pulse is applied in this manner, the time can be optimally distributed differently according to the time required for charging for each channel combination, so that the sensing time can be effectively reduced without deteriorating the touch performance. The different periods of the touch sensor drive pulses for each channel combination are effective for simultaneously sampling touch sensors existing on the same drive channel in the touch sensor readout path.

FIG. 13 is a graph showing the time required for one touch frame according to the present invention and the touch frame rate, respectively, in comparison with the related art.

FIG. 13 shows experimental results when 10 received values for each channel combination are cumulatively detected for 24 drive channels and 32 receive channels built in a 10.1-inch display panel. As can be seen from the experimental results shown in FIG. 13, in the prior art in which driving pulses of the same period are collectively applied to all the driving channels, the time required for one touch frame was measured to be approximately 0.017 seconds, / Sec. On the other hand, in the first embodiment of the present invention in which at least one of the period of the touch sensor driving pulse and the pulse width of the high level is different for each channel combination, the time required for one touch frame is measured to be about 0.011 seconds, Is 91 frames / second, which is 52% higher than the conventional one. In the second embodiment of the present invention in which the driving pulse period is different for each driving channel, the time required for one touch frame is measured to be approximately 0.014 seconds. As a result, the touch frame rate is 70 frames / Could know.

As described above, according to the present invention, the touch driving time can be optimally allocated to each channel to reduce unnecessary driving time to reduce the sensing time, thereby greatly improving the touch frame rate without deteriorating the touch performance. As the touch frame rate is improved, the touch response becomes faster and smoother.

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.

100: display panel 202: display data drive circuit
204: display scan driving circuit 302: touch sensor driving circuit
304: touch sensor readout circuit 306: touch controller
400: timing controller

Claims (8)

A plurality of driving electrode lines functioning as driving channels;
A plurality of receiving electrode lines which function as receiving channels intersecting with the driving electrode lines and which implement touch sensors by combining the driving channels with a plurality of channel combinations;
A touch sensor driving circuit for generating a touch sensor driving pulse differently for each of the channel combinations or the driving channels and supplying the same to the driving electrode lines; And
And a touch sensor docking circuit for sampling the touch sensors through the reception electrode lines and converting the sampled touch sensors into digital touch data,
The driving electrode lines and the receiving electrode lines intersect each other, mutual capacitors are formed at the intersections,
The touch sensor driving circuit increases the pulse width of the high level of the touch sensor driving pulse so as to be proportional to the distance between the intersection and the touch sensor driving circuit for each combination of the channels, The pulse width of the low level of the touch sensor driving pulse is increased so as to be proportional to the distance or the pulse width of the high level of the touch sensor driving pulse is made to be the same between the driving channels, And increases the pulse width of the low level of the touch sensor driving pulse so as to be proportional to the distance. delete delete delete The method according to claim 1,
The touch sensor readout circuit includes:
Wherein when the touch sensor driving circuit makes the pulse width of the high level or the pulse width of the low level different for each channel combination, the touch sensors sequentially sample each of the touch sensors located in the channel combinations a plurality of times A display device having a touch sensor. delete delete The method according to claim 1,
The touch sensor readout circuit includes:
Wherein the touch sensor driving circuit samples the touch sensors existing on the same driving channel at a plurality of times when the pulse width of the low level of the touch sensor driving pulse is different for each driving channel. Device.

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