JP2011081313A - Drive circuit for display panel with touch sensor and display device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve chip shrink of a drive circuit relating to a drive technique of a panel having a touch sensor integrated with the panel. <P>SOLUTION: The drive circuit 100 includes a plurality of driver units 10. Each driver unit 10 is disposed in each data line DL, applies a driving signal S1 to the corresponding data line DL and receives a detection signal S2 from a sensor connected with the corresponding data line DL. An A/D converter 30 converts detection signals S3 received by the plurality of driver units 10 to digital signals. A first selector SEL1 receives a driving signal S4 from a D/A convertor 12 and a detection signal S5 held by a sample hold circuit 14, selects one side and outputs it. A buffer amplifier 16 receives an output signal S6 of the first selector SEL1. A second selector SEL2 receives an output signal S7 of the buffer amplifier 16 and outputs the output signal S7 selectively to either of the corresponding data line DL and A/D converter 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a driving technique for a display panel using a liquid crystal or an organic EL (Electro-Luminescence) element, and particularly relates to a driving technique for a panel in which a touch sensor is integrated.

  A liquid crystal display (LCD) panel or an organic EL display panel (hereinafter collectively referred to as a display panel) includes a plurality of data lines, a plurality of scanning lines arranged orthogonal to the data lines, and the data lines and the scanning lines. A plurality of pixel circuits arranged in a matrix at intersections are provided.

  In recent years, display panels with touch sensors have been developed. FIG. 1 is a diagram illustrating a configuration example of a display panel with a touch sensor. The panel 2 includes pixels (R, G, B) arranged in a matrix on the panel surface, and a plurality of sensors (light receiving elements) 4 regularly arranged on the panel surface. The gate driver 6 sequentially selects a group of pixels arranged in the same column (or row) among the plurality of pixels (R, G, B). The sensor scan driver 8 selects a plurality of sensors 4 in order.

  At least one sensor 4 and at least one pixel (R, G, B) are connected to the data line DL provided for each row of the panel 2. Each sensor 4 generates a detection signal corresponding to the received light intensity and outputs it to the corresponding data line DL. Further, a pixel connected to a certain data line DL emits light with a luminance corresponding to a drive signal applied via the data line.

  A drive circuit 200 is connected to the panel 2. The drive circuit 200 includes a set of a sensor processing unit 202 and a light emission control unit 204 for each data line DL.

  When the user touches a certain point on the panel surface, a difference in received light intensity occurs between the sensor 4 immediately below the contact point and the sensor 4 at another position. The sensor processing unit 202 receives the detection signal from the sensor 4 connected to the corresponding data line DL, and specifies the sensor 4 touched by the user. The light emission control unit 204 applies a drive signal to the pixels connected to the corresponding data line DL.

Japanese Patent Laid-Open No. 10-283794 JP-A-8-77789

  Such a drive circuit for driving a display panel with a touch sensor needs to be provided with a sensor processing unit and a light emission control unit for each data line, so that the circuit scale becomes large. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and one of exemplary purposes of an embodiment thereof is a chip shrink of a drive circuit.

1. One embodiment of the present invention relates to a drive circuit for a display panel with a touch sensor. The display panel is arranged in a matrix, and a plurality of pixels that emit light with luminance according to the drive signal, and a plurality of sensors that detect that the user has touched and output a detection signal indicating a detection result, And a plurality of data lines connected to at least one pixel and at least one sensor. Each of the drive circuits is provided for each data line, applies a drive signal to the corresponding data line, and receives a detection signal from a sensor connected to the corresponding data line, and a plurality of driver units And an A / D converter that converts the detection signal received into a digital signal. Each of the plurality of driver units includes a D / A converter that generates a drive signal to be applied to a corresponding data line, a sample and hold circuit that samples and holds a detection signal from a sensor connected to the corresponding data line, and a D / A A first selector that receives a drive signal from the converter and a detection signal held by the sample hold circuit, and selects and outputs one; a buffer amplifier that receives the output signal of the first selector; and an output signal of the buffer amplifier; And a second selector that selectively outputs to either the corresponding data line or the A / D converter.

  According to this aspect, since a single buffer amplifier can be used as the sense amplifier and the source driver for each data line, the circuit area can be reduced.

  Another embodiment of the present invention is also a drive circuit. The drive circuit is provided for each data line, and includes a plurality of driver units that apply drive signals to the corresponding data lines and receive detection signals from sensors connected to the corresponding data lines. Each of the plurality of driver units includes a buffer amplifier. Each driver unit is configured such that the buffer amplifier can be switched as a source driver that applies a drive signal to the data line and a sense amplifier that receives a detection signal from the sensor.

  According to this aspect, since a single buffer amplifier can be used as the sense amplifier and the source driver for each data line, the circuit area can be reduced.

2. Yet another embodiment of the present invention is also a drive circuit. The drive circuit is provided for each data line, and includes a plurality of driver units that apply drive signals to the corresponding data lines and receive detection signals from the sensors connected to the corresponding data lines. Each of the plurality of driver units includes a D / A converter that generates a drive signal to be applied to the corresponding data line, a source driver that receives the drive signal from the D / A converter and outputs the drive signal to the corresponding data line, and corresponding data A sample hold circuit that samples and holds a detection signal from a sensor connected to the line, a voltage source that generates a plurality of threshold voltages having a predetermined potential difference, and a threshold voltage are provided for each threshold voltage. And a plurality of comparators for comparing the detection signal held by the hold circuit with a corresponding threshold voltage.

  According to this aspect, the detection signal is converted into a digital value by the voltage source and the plurality of comparators provided in the driver unit. By transmitting the digital detection signal to the signal processing circuit, resistance to noise can be increased.

  The voltage source may change a plurality of threshold voltages stepwise with time. In this case, the dynamic range can be expanded.

  In the driving circuit of a certain aspect, each of the plurality of driver units receives a driving signal from the D / A converter that generates a driving signal to be applied to the corresponding data line and the D / A converter, and outputs the driving signal to the corresponding data line A source driver, a sample-and-hold circuit that samples and holds a detection signal from a sensor connected to the corresponding data line, a voltage source that generates a threshold voltage that changes stepwise with time, and a sample-and-hold circuit. A comparator for comparing the detected signal with a threshold voltage.

  According to this aspect, the detection signal is converted into a digital value by the voltage source and the comparator provided in the driver unit. By transmitting the digital detection signal to the signal processing circuit, resistance to noise can be increased.

3. Yet another embodiment of the present invention also relates to a drive circuit. The drive circuit is provided for each data line, and includes a plurality of driver units that apply drive signals to the corresponding data lines and receive detection signals from the sensors connected to the corresponding data lines. Each of the plurality of driver units generates first and second pads to be connected to the corresponding data line via a common pattern wiring and a driving signal to be applied to the corresponding data line in the mounting state of the driving circuit. Connected to the corresponding data line via the second pad, and a source driver that receives the motion signal from the D / A converter and outputs it to the corresponding data line via the first pad. A sample and hold circuit for receiving and detecting the detection signal from the sensor. In each driver unit, the second pad, the sample hold circuit, the source driver, and the D / A converter are arranged vertically on one side of the semiconductor substrate with the source driver and the D / A converter adjacent to each other.

  When only a single pad is provided for each driver unit, and a sample hold circuit and a source driver are commonly connected to the pad, a drive signal from the source driver may be mixed into the sample hold circuit as noise. In the driving circuit of this aspect, since the sample hold circuit and the source driver are connected via a pattern wiring outside the semiconductor substrate, noise mixed in the sample hold circuit can be reduced and the accuracy as a sensor can be improved. Can do.

  The first pad may be disposed at a position overlapping the source driver.

  The second pad may be disposed at a position closest to one side of the semiconductor substrate.

  Yet another embodiment of the present invention is a display device. This device includes a display panel with a touch sensor and a drive circuit that drives the display panel according to any one of the above aspects.

  Note that any combination of the above-described constituent elements and the constituent elements and expressions of the present invention replaced with each other among methods, apparatuses, systems, and the like are also effective as an aspect of the present invention.

  According to an aspect of the present invention, the drive circuit can be chip-shrinked.

It is a figure which shows the structural example of the display panel with a touch sensor. 1 is a circuit diagram showing a configuration of a drive circuit according to a first embodiment. FIG. 3 is a time chart showing the operation of the drive circuit of FIG. 2. It is a circuit diagram which shows the structure of the driver unit which concerns on a comparison technique. It is a circuit diagram which shows the structure of the driver unit which concerns on 2nd Embodiment. 6 is a time chart illustrating an operation during a sense period of the driver unit of FIG. 5. FIGS. 7A to 7C are diagrams showing a drive circuit according to the third embodiment and a drive circuit according to a comparative technique, respectively.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. The embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  In this specification, “the state in which the member A is connected to the member B” means that the member A and the member B are physically directly connected, or the member A and the member B are electrically connected. The case where it is indirectly connected through another member that does not affect the state is also included.

(First embodiment)
In the first embodiment, a technique related to miniaturization of a drive circuit that drives the display panel with a touch sensor described in FIG. 1 will be described.

FIG. 2 is a circuit diagram showing a configuration of the drive circuit 100 according to the first embodiment. Since the display panel 2 to be driven is the same as that in FIG. 1, the description thereof is omitted, and only n (n is a natural number) data lines DL _{1 to} DL _n are shown.

The drive circuit 100 includes a plurality of driver units 10 provided for each data line DL and an A / D converter 30.
driver unit 10_i the i-th (1 ≦ i ≦ n), the corresponding applies a driving signal S1 _i to the data line DL _i, the detection signal from the sensor connected to the corresponding data line DL _i (not shown) Receive S2 _i .
The multiplexer 32 is provided in front of the A / D converter 30, receives a plurality of detection signals S3 _{1 to} S3 _n output from the plurality of driver units 10_1 to 10_n, selects one of them and outputs it to the A / D converter 30. To do. The A / D converter 30 converts the detection signal S3 selected by the multiplexer 32 into a digital signal and outputs it to the signal processing circuit 40 at the subsequent stage.

  Next, the configuration of the driver unit 10 will be described. Each driver unit 10 is configured similarly.

  The driver unit 10 includes a D / A converter 12, a sample hold circuit 14, and a buffer amplifier 16. The D / A converter 12 generates a drive signal S4 to be supplied to the corresponding data line DL. The sample hold circuit 14 samples and holds a detection signal S2 from a sensor (not shown) connected to the corresponding data line DL.

  The first selector SEL1 receives the drive signal S4 from the D / A converter 12 and the detection signal S5 held by the sample hold circuit 14 at two input terminals IN1 and IN2, respectively. The first selector SEL1 selects one of the two signals and outputs it from the output terminal OUT. For example, the first selector SEL1 includes a plurality of switches SW1a and SW2a each having one end connected in common to the output terminal OUT. When the first switch SW1a is on, the drive signal S4 of the first input terminal IN1 is selected, and when the second switch SW1b is on, the detection signal S5 of the second input terminal IN2 is selected. That is, the first selector SEL1 functions as a multiplexer.

  The buffer amplifier 16 receives the output signal S6 of the first selector SEL1. The buffer amplifier 16 is a non-inverting amplifier (voltage follower) having a gain of 1, for example, using an operational amplifier. The buffer amplifier 16 may have a gain greater than 1 or less than 1.

  The second selector SEL2 receives the output signal S7 of the buffer amplifier 16 at its input terminal IN. The second selector SEL2 has a first output terminal OUT1 connected to the corresponding data line DL and a second output terminal OUT2 connected to the A / D converter 30, and outputs the output signal S7 of the buffer amplifier 16 to the data The signal is selectively output to either the line DL or the A / D converter 30. For example, the second selector SEL2 includes two switches SW2a and SW2b each having one end connected in common to the input terminal IN. When the first switch SW2a is on, the signal S7 is output from the first output terminal OUT1, and when the second switch SW2b is on, the signal S7 is output from the second output terminal OUT2. That is, the first selector SEL1 functions as a demultiplexer.

  The above is the configuration of the driving circuit 100 in FIG. Next, the operation will be described. FIG. 3 is a time chart showing the operation of the drive circuit 100 of FIG.

  The driving circuit 100 alternately repeats a driving period (writing period) φ1 and a sensing period (reading period) φ2 in a time division manner.

  In the driving period φ1, the first selector SEL1 is turned on to the first input terminal IN1 side (SW1a is turned on). The second selector SEL2 is turned on to the first output terminal OUT1 side (SW2a is on). In this state, the drive signal S4 output from the D / A converter 12 is output to the corresponding data line DL via the buffer amplifier 16. The time chart of FIG. 3 shows a situation in which the three subpixels R, G, and B are driven in order.

  In the sense period φ2, the second selector SEL2 is turned on to the second input terminal IN2 side (SW1b is turned on). The second selector SEL2 is turned on to the second output terminal OUT2 side (SW2b is on). A detection signal S2 output from a sensor (not shown) of the display panel 2 is input to the sample hold circuit 14 via the data line DL. The sample hold circuit 14 becomes active during the sense period φ2. The detection signal S5 held at this time is output to the A / D converter 30 via the first selector SEL1, the buffer amplifier 16, and the second selector SEL2.

The above is the operation of the drive circuit 100.
According to the drive circuit 100, a source driver for applying the drive signal S1 to the pixel via the data line DL and a sense amplifier for receiving the detection signal S2 output from the sensor can be shared. The circuit area can be greatly reduced. This effect becomes clear by comparison with comparative techniques.

FIG. 4 is a circuit diagram showing a configuration of the driver unit 310 according to the comparison technique. The driver unit 310 includes a D / A converter 312, a source driver 316, a switch SW11, a sample hold circuit 314, a sense amplifier 318, and a switch SW13.
The switch SW11 is turned on during the driving period φ1. During the sense period φ2, when the switch SW12 of the sample hold circuit 314 is turned on, the capacitor C1 is charged with the detection signal S2, and then turned off to hold the detection signal S5 in the capacitor C1. Note that the configuration of the sample hold circuit 314 is not limited to this. The sense amplifier 318 outputs the held detection signal S5 (S8).

  In FIG. 4, the source driver 316 and the sense amplifier 318 are configured using separate amplifiers (operational amplifiers). That is, N (the number of data lines) × 2 operational amplifiers are required. On the other hand, according to the drive circuit 100 of FIG.

  From another viewpoint, the drive circuit 100 in FIG. 2 can be grasped as follows. That is, each of the plurality of driver units 10 includes a buffer amplifier 16. Each driver unit 10 is configured to be able to switch the buffer amplifier 16 as a source driver that applies a drive signal S1 to the data line DL and a read driver that receives a detection signal S2 from a sensor (not shown). With this configuration, the circuit area can be greatly reduced.

(Second Embodiment)
The driver unit 310 in FIG. 4 outputs an analog detection signal S8. The detection signal S8 propagates through the transmission line 320 in the drive circuit and is input to the A / D converter 30. If noise is mixed in the analog detection signal S8, there is a problem that the A / D converter 30 cannot accurately detect the amount of received light. In the second embodiment, a technique for increasing noise resistance will be described.

FIG. 5 is a circuit diagram showing a configuration of a driver unit 10a according to the second embodiment. The basic configuration of the driver unit 10a in FIG. 5 is the same as that in FIG.
The difference from FIG. 4 is that a plurality of comparators CMP <b> 1 to CMP <b> 4 and a voltage source 20 are provided instead of the sense amplifier 318.

The voltage source 20 generates a plurality (four in this case) of threshold voltages Vref [0] to Vref [3] having a predetermined potential difference based on the reference voltage Vref from the D / A converter 22. For example,
Vref [i] = Vref + ΔV × i
A relationship may be established. The plurality of comparators CMP1 to CMP4 are provided for each of the threshold voltages Vref [0] to Vref [3]. The i-th (1 ≦ i <4) comparator CMPi compares the potential V _S5 of the detection signal S5 held by the sample and hold circuit 314 with the corresponding threshold voltage Vref [i−1]. The comparison result Di becomes a high level when V _S5 <Vref [i−1].

  The driver unit 10a outputs the digital signals D1 to D4 to the signal processing circuit 40 at the subsequent stage.

  The voltage source 20 may change the plurality of threshold voltages Vref [0] to [3] stepwise with time. This process can be realized by changing the reference voltage Vref output from the D / A converter 22 in steps.

FIG. 6 is a time chart showing the operation during the sense period of the driver unit 10a of FIG. At each predetermined time interval Δt, the reference voltage Vref increases, and the threshold voltages Vref [0] to [3] also increase accordingly.
In certain timing, the magnitude relation between the threshold voltage Vref [0] ~ [3] and the voltage _{V S5} of the detection signal S5 is changed, the value of the comparison result D1~D4 transitions.

According to the driver unit 10a of FIG. 5, the level of the detection signal S5 can be determined based on the timing when each of the comparison results D1 to D4 changes.
In the configuration of FIG. 4, the analog detection signal S5 propagates through the transmission line 320, and noise mixed at that time becomes a problem. However, according to the configuration of FIG. 5, the digital determination results D1 to D4 propagate. There is an advantage that it is less susceptible to noise.

In the driver unit 10a of FIG. 5, the resolution for determining the level of the detection signal S5 is determined according to the step width ΔVref of the reference voltage Vref and the number of comparators CMP, and the two are in a trade-off relationship.
That is, in order to obtain the same resolution, the step width Vref can be increased by increasing the number of comparators CMP, that is, the number of steps can be reduced. This means that the time required for determining the level of the detection signal S5 can be shortened.

  Conversely, the number of comparators CMP can be reduced by reducing the step width Vref. In this case, in order to obtain the same resolution, the number of steps of the reference voltage Vref increases, so the time required for level determination becomes longer, but the circuit area can be reduced.

(Third embodiment)
As described above, in the driver unit 310 of FIG. 4, noise mixed when the detection signal S8 propagates through the transmission line 320 in the drive circuit becomes a problem. In the third embodiment, a technique for increasing noise resistance by an approach different from that of the second embodiment, specifically by devising a layout, will be described.

  FIGS. 7A to 7C are diagrams showing a driving circuit according to the third embodiment and the comparison technique, respectively.

FIG. 7A is a circuit diagram of a drive circuit 100b according to the third embodiment. FIG. 7A shows only a single driver unit 10b.
Each driver unit 10 includes a D / A converter 12b, a source driver 16b, a sample hold circuit 14b, a first pad PAD1, and a second pad PAD2. The D / A converter 12b, the source driver 16b, and the sample hold circuit 14b correspond to the D / A converter 312, the source driver 316, and the sample hold circuit 314 in FIG. 4, and are blocks having equivalent functions. In the following description, the switch SW11 is regarded as a part of the source driver 16b.

  The driver unit 310 of FIG. 4 includes only a single pad PAD3, whereas the driver unit 10b of FIG. 7A includes two pads PAD1 and PAD2.

  FIG. 7B is a plan layout view of the drive circuit 100b according to the third embodiment. The drive circuit 100b includes a plurality of driver units 10 (drive cells), which are arranged along at least one side 52 of the semiconductor substrate 50 on which the drive circuit 100b is integrated.

  The drive circuit 100b is mounted on the display panel 2 in the form of COF (Chip On Film) or COG (Chip On Glass). In other words, the drive circuit 100b is generally electrically and physically connected to the pattern wiring 54 formed on the film or the glass substrate.

The first pad PAD1 and the second pad PAD2 are connected to corresponding data lines (not shown) via the common pattern wiring 54 in the mounted state of the drive circuit 100b.
The D / A converter 12b generates a drive signal to be applied to the corresponding data line. The source driver 16b receives the drive signal from the D / A converter 12b and outputs it to the corresponding data line via the first pad PAD1. The sample hold circuit 14b receives the detection signal from the sensor connected to the corresponding data line via the second pad PAD2, and samples and holds it.

  The second pad PAD2, the sample hold circuit 14b, the source driver 16b, and the D / A converter 12b are arranged in a line in the vertical direction on one side 52 of the semiconductor substrate 50 with the source driver 16b and the D / A converter 12b adjacent to each other. Is done. The first pad PAD1 is disposed at a position overlapping the source driver 16b.

  FIG.7 (c) is sectional drawing of the 7B-7B line | wire of the driver unit 10b of FIG.7 (b). The first pad PAD1 and the second pad PAD2 are connected to each other through the pattern wiring 54.

  The above is the configuration of the drive circuit 100b according to the third embodiment. The effect of the drive circuit 100b becomes clear in comparison with the comparison technique described below. FIG. 7D is a layout diagram of one driver unit 310 of the drive circuit 300 according to the comparison technique of FIG.

  In this comparison technique, only a single pad PAD3 is provided. The sample hold circuit 314 is connected to the pad PAD3 via a wiring 60 formed in the semiconductor substrate 50, and the source driver 316 is connected to the pad PAD3 via a wiring 62. Since the wiring 62 crosses over the sample hold circuit 314, there is a possibility that the drive signal from the source driver 316 is mixed into the sample hold circuit 314. If noise enters the sample and hold circuit 314, the accuracy of the sensor deteriorates.

  On the other hand, according to the drive circuit 100b shown in FIGS. 7A to 7C, the sample hold circuit 14b and the source driver 16b are connected via the pattern wiring 54 outside the drive circuit 100b. Noise contamination can be suppressed.

  A thin insulating layer is provided between the wiring 62 and the sample hold circuit 314 in FIG. On the other hand, in FIG. 7C, a thicker insulating layer exists between the pattern wiring 54 through which the drive signal from the source driver 16b propagates and the sample hold circuit 14b. The amount of contamination is reduced.

In FIG. 7B, the first pad PAD1 is disposed at a position overlapping the source driver 16b. As a result, an increase in area due to the increase of one pad can be suppressed as compared with FIG.
If there is a margin in the circuit area, the pad PAD1 may be disposed adjacent to the source driver 16b without overlapping.

  Although the present invention has been described based on the embodiments, the embodiments merely show the principle and application of the present invention, and the embodiments are within the scope of the claims. It goes without saying that many variations and changes in arrangement are possible without departing from the spirit of the present invention as defined.

DESCRIPTION OF SYMBOLS 100 ... Drive circuit, DL ... Data line, 2 ... Display panel, 4 ... Sensor, 10 ... Driver unit, 12 ... D / A converter, 14 ... Sample hold circuit, 16 ... Buffer amplifier, 20 ... Voltage source, 30 ... A / D converter, 32 ... multiplexer, S1, S4 ... drive signal, S2, S3 ... detection signal, SEL1 ... first selector, SEL2 ... second selector, CMP ... comparator, 50 ... semiconductor substrate, 52 ... side, 54 ... pattern Wiring, PAD1 ... first pad, PAD2 ... second pad.

Claims (9)

A drive circuit for a display panel with a touch sensor, wherein the display panel comprises:
A plurality of pixels that are arranged in a matrix and emit light at a luminance corresponding to a drive signal;
A plurality of sensors that detect that the user has touched and output a detection signal indicating a detection result;
A plurality of data lines each connected to at least one of the pixels and at least one of the sensors;
Having
The drive circuit is
A plurality of driver units each provided for each data line, for applying the drive signal to the corresponding data line, and receiving the detection signal from a sensor connected to the corresponding data line;
An A / D converter that converts the detection signals received by the plurality of driver units into digital signals;
With
Each of the plurality of driver units is
A D / A converter for generating the drive signal to be applied to a corresponding data line;
A sample hold circuit that samples and holds the detection signal from the sensor connected to the corresponding data line;
A first selector that receives the drive signal from the D / A converter and the detection signal held by the sample and hold circuit, and selects and outputs one of the signals;
A buffer amplifier for receiving an output signal of the first selector;
A second selector that receives an output signal of the buffer amplifier and selectively outputs it to either the corresponding data line or the A / D converter;
A drive circuit comprising: A drive circuit for a display panel with a touch sensor, wherein the display panel comprises:
A plurality of pixels that are arranged in a matrix and emit light at a luminance corresponding to a drive signal;
A plurality of sensors that detect that the user has touched and output a detection signal indicating a detection result;
A plurality of data lines each connected to at least one pixel and at least one sensor;
Having
The drive circuit is
A plurality of driver units each provided for each data line, for applying a drive signal to the corresponding data line and receiving a detection signal from a sensor connected to the corresponding data line;
Each of the plurality of driver units includes a buffer amplifier, and the buffer amplifier is configured to be switchable as a source driver that applies the drive signal to the data line and a sense amplifier that receives the detection signal from the sensor. Drive circuit. A drive circuit for a display panel with a touch sensor, wherein the display panel comprises:
A plurality of pixels that are arranged in a matrix and emit light at a luminance corresponding to a drive signal;
A plurality of sensors that detect that the user has touched and output a detection signal indicating a detection result;
A plurality of data lines each connected to at least one of the pixels and at least one of the sensors;
Having
Each of the drive circuits is provided for each data line, applies the drive signal to the corresponding data line, and receives the detection signal from a sensor connected to the corresponding data line. With
Each of the plurality of driver units is
A D / A converter for generating the drive signal to be applied to a corresponding data line;
A source driver that receives the drive signal from the D / A converter and outputs it to the corresponding data line;
A sample and hold circuit that samples and holds the detection signal from the sensor connected to the corresponding data line;
A voltage source for generating a plurality of threshold voltages having a predetermined potential difference;
A plurality of comparators provided for each of the threshold voltages, each of which compares the detection signal held by the sample and hold circuit with the corresponding threshold voltage;
A drive circuit comprising:   The drive circuit according to claim 3, wherein the voltage source changes the plurality of threshold voltages stepwise with time. A drive circuit for a display panel with a touch sensor, wherein the display panel comprises:
A plurality of pixels that are arranged in a matrix and emit light at a luminance corresponding to a drive signal;
A plurality of sensors that detect that the user has touched and output a detection signal indicating a detection result;
A plurality of data lines each connected to at least one of the pixels and at least one of the sensors;
Having
Each of the drive circuits is provided for each of the data lines, applies the drive signal to the corresponding data line, and receives the detection signal from a sensor connected to the corresponding data line. With
Each of the plurality of driver units is
A D / A converter for generating the drive signal to be applied to a corresponding data line;
A source driver that receives the drive signal from the D / A converter and outputs it to the corresponding data line;
A sample hold circuit that samples and holds the detection signal from the sensor connected to the corresponding data line;
A voltage source that generates a threshold voltage that changes stepwise with time;
A comparator that compares the detection signal held by the sample and hold circuit with the threshold voltage;
A drive circuit comprising: A drive circuit for a display panel with a touch sensor, wherein the display panel comprises:
A plurality of pixels that are arranged in a matrix and emit light at a luminance corresponding to a drive signal;
A plurality of sensors that detect that the user has touched and output a detection signal indicating a detection result;
A plurality of data lines each connected to at least one of the pixels and at least one of the sensors;
Having
The drive circuit is
A plurality of driver units each provided for each data line, for applying the drive signal to the corresponding data line and receiving the detection signal from a sensor connected to the corresponding data line;
Each of the plurality of driver units is
In the mounted state of the drive circuit, first and second pads to be connected to the corresponding data lines through a common pattern wiring;
A D / A converter for generating the drive signal to be applied to a corresponding data line;
A source driver that receives the drive signal from the D / A converter and outputs the drive signal to the corresponding data line via the first pad;
A sample-and-hold circuit that receives the detection signal from the sensor connected to the corresponding data line via the second pad and samples and holds the detection signal;
Including
The drive circuit is integrated on a single semiconductor substrate,
In each driver unit,
The first and second pads, the sample-and-hold circuit, the source driver, and the D / A converter are arranged in a direction perpendicular to one side of the semiconductor substrate in a state where the source driver and the D / A converter are adjacent to each other. A drive circuit characterized by being arranged in the above.   The driving circuit according to claim 6, wherein the first pad is disposed at a position overlapping the source driver.   The drive circuit according to claim 6, wherein the second pad is disposed at a position closest to one side of the semiconductor substrate. A display panel with a touch sensor;
The drive circuit according to any one of claims 1 to 8, which drives the display panel;
A display device comprising:

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