Display device with touch sensor

Abstract

The present invention relates to a display device with a touch sensor, the display device with a touch sensor comprising: a display panel connected to a plurality of data lines and a plurality of scan lines, including a plurality of pixels; a scan drive unit, supplying a plurality of scan signals to the plurality of pixels through the plurality of scan lines; a data drive unit, receiving digital image data, converting the digital image data into analog data signals and supplying the analog data signals to the plurality of pixels through the plurality of data lines; a data change amount calculation unit, using the digital image data to obtain a change amount of image data of each data channel, and summing up the change amount of image data of each data channel to calculate an integrated data change value; a plurality of correction value calculation units, using the integrated data change value to calculate a touch correction value of each sensing channel; a touch sensing unit, comprising a plurality of driving electrodes and a plurality of detection electrodes intersecting each other; a touch driving unit, supplying a touch driving signal to the plurality of driving electrodes; and a plurality of touch correction circuits, performing noise removal of each sensing channel using a plurality of detection signals received from the touch sensing unit and a touch correction value of each sensing channel received from the correction value calculation unit.

Description

Technical Field

[0001] The present invention relates to a display device with a touch sensor, and more particularly, to a display device with a touch sensor capable of improving touch sensitivity by removing an influence caused by display noise. Background Art

[0002] As people's interest in information display increases and the demand for using portable information media increases, research and commercialization of display devices have become a focus.

[0003] Such display devices include liquid crystal display devices (Liquid Crystal Display Device), field emission display devices (Field Emission Display Device), plasma display devices (Plasma Display Device) and organic light emitting display devices (Organic Light Emitting Display Device).

[0004] Among them, the organic light emitting display device uses an organic light emitting diode that generates light through the recombination of electrons and holes to display images, which has the advantages of fast response speed and low power consumption.

[0005] Recent display devices have an image display function and also have a touch sensor for receiving a user's touch, so that the user can use the display device more conveniently through the touch sensor.

[0006] Although various types of touch sensors are used, capacitive touch sensors can detect the position of capacitance changes and grasp the touch position according to the touch of a person's hand or an object. Since they can detect multi-point touches easily and with excellent accuracy, they have been widely used recently.

[0007] However, according to the trend of flexible organic light emitting display devices and miniaturization and thinning, the space interval between the display panel and the touch sensor will be reduced, thereby increasing the display driving noise caused by the touch sensor, and thus failing to obtain the desired touch sensing sensitivity. Summary of the invention

[0008] Technical issues

[0009] An object of the present invention is to provide a display device having a touch sensor capable of improving touch sensitivity by removing the influence of display noise.

[0010] Technical Solution

[0011] According to the features of the present invention for achieving the above-mentioned purpose, the present invention may include: a display panel connected to a plurality of data lines and a plurality of scan lines, including a plurality of pixels each having a light-emitting device; a scan drive unit, supplying a plurality of scan signals to the plurality of pixels through the plurality of scan lines; a data drive unit, receiving digital image data, converting the digital image data into analog data signals and supplying the analog data signals to the plurality of pixels through the plurality of data lines; a data change amount calculation unit, using the digital image data to calculate the change amount of the image data of each data channel, and summing up the change amount of the image data of each data channel to calculate an integrated data change value; a plurality of correction value calculation units, using the integrated data change value to calculate a touch correction value of each sensing channel; a touch sensing unit, including a plurality of drive electrodes and a plurality of detection electrodes intersecting each other; a touch drive unit, supplying a touch drive signal to the plurality of drive electrodes; and a plurality of touch correction circuits, performing noise removal for each sensing channel using a plurality of detection signals received from the touch sensing unit and a touch correction value of each sensing channel received from the correction value calculation unit.

[0012] Furthermore, the data change calculation unit may include: a change detection unit, which uses the digital image data to detect the change of the image data of each data channel between the previous horizontal period and the next horizontal period; and a change aggregating unit, which calculates the integrated data change value by aggregating the change of the image data of each data channel detected by the change detection unit.

[0013] Furthermore, each of the correction value calculation units may include: a modulator for modulating the integrated data change value; an integration unit for integrating the integrated data change value received from the modulator during a preset period to calculate a touch correction value; and a trigger circuit for receiving the touch correction value and supplying the touch correction value to a corresponding touch correction circuit in response to a sampling clock.

[0014] Furthermore, the modulator may utilize the touch driving signal to perform modulation.

[0015] Furthermore, each of the above-mentioned touch correction circuits may include: an amplifier unit, connected to at least one detection electrode, and outputting a sensing signal reflecting the capacitance change of the above-mentioned detection electrode; an analog-to-digital converter, converting the sensing signal of the above-mentioned amplifier unit into a digital signal for output; and a noise removal unit, calculating the touch data by deducting the product value of the touch correction value of the corresponding trigger circuit and the correction coefficient from the sensing signal received from the above-mentioned analog-to-digital converter.

[0016] Furthermore, each of the above-mentioned touch correction circuits may include: a demodulator, which demodulates the i-th detection signal and the i+1-th detection signal received from the adjacent i-th detection electrode and the i+1-th detection electrode; a differential amplifier, which receives the demodulated i-th detection signal and the i+1-th detection signal from the above-mentioned demodulator to output a sensing signal; an analog-to-digital converter, which converts the above-mentioned sensing signal into a digital signal for output; and a noise removal unit, which calculates touch data by deducting the product value of the touch correction value of the corresponding trigger circuit and the correction coefficient from the sensing signal received from the above-mentioned analog-to-digital converter.

[0017] Furthermore, the analog-to-digital converter may perform sampling in accordance with the sampling clock.

[0018] Furthermore, the demodulator may utilize the touch driving signal to perform demodulation of the i-th detection signal and the (i+1)-th detection signal.

[0019] Furthermore, the sampling clock may be synchronized with a horizontal synchronization signal.

[0020] Furthermore, the present invention may further include a frequency multiplier, which receives the horizontal synchronization signal as an input signal and outputs the sampling clock as an output signal.

[0021] Furthermore, the present invention may further include a correction coefficient calculation unit for calculating the correction coefficient.

[0022] Furthermore, the correction coefficient calculation unit may update the correction coefficient using a least mean square (LMS) algorithm.

[0023] Furthermore, the display device may include a plurality of virtual pixels that do not have the light-emitting device. During the driving period of the plurality of virtual pixels, the data change amount calculation unit uses the digital image data to obtain the change amount of the image data of each data channel related to the plurality of virtual pixels, and calculates the virtual data change value by summing up the change amount of the image data of each data channel related to the plurality of virtual pixels. The plurality of correction value calculation units use the virtual data change value to calculate the virtual correction value of each sensing channel. The correction coefficient calculation unit uses the virtual correction value of each sensing channel, the first signal output from the analog-to-digital converter during the driving period of the plurality of virtual pixels, and the second signal output from the analog-to-digital converter during the non-driving period of the plurality of pixels and the plurality of virtual pixels to calculate the correction coefficient of each sensing channel.

[0024] Furthermore, the data change amount calculation unit may include: a gamma compensation unit, which gamma corrects the digital image data with reference to a preset gamma table; a change amount detection unit, which uses the digital image data corrected by the gamma compensation unit to detect the change amount of the image data of each data channel between the previous horizontal period and the next horizontal period; and a change amount aggregating unit, which calculates the integrated data change value by aggregating the change amount of the image data of each data channel detected by the change amount detection unit.

[0025] Furthermore, each of the correction value calculation units may include: a filtering unit, which performs digital filtering on the integrated data change value; a modulator, which modulates the integrated data change value transmitted through the filtering unit; an integration unit, which integrates the integrated data change value received from the modulator during a preset period to calculate the touch correction value; and a trigger circuit, which receives the touch correction value and supplies the touch correction value to the corresponding touch correction circuit in response to the sampling clock.

[0026] Effects of the Invention

[0027] According to the present invention as described above, the present invention can provide a display device having a touch sensor capable of improving touch sensitivity by removing the influence caused by display noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 1 is a diagram briefly showing a display device with a touch sensor according to an embodiment of the present invention.

[0029] Figure 2 FIG. 1 is a diagram showing in detail the structure of a display device with a touch sensor according to an embodiment of the present invention.

[0030] Figure 3 The following is a diagram showing a display panel and a display driving circuit according to an embodiment of the present invention in more detail.

[0031] Figure 4 To show Figure 3 A diagram of an embodiment of a pixel is shown.

[0032] Figure 5 FIG. 1 is a diagram showing a touch sensing unit and a touch control unit according to an embodiment of the present invention in more detail.

[0033] Figure 6 A diagram showing a data processing unit according to an embodiment of the present invention.

[0034] Figure 7 FIG. 1 is a diagram showing a touch correction circuit according to an embodiment of the present invention.

[0035] Figure 8 This is a diagram showing a data processing unit according to another embodiment of the present invention.

[0036] Fig. 9 FIG. 1 is a diagram showing a frequency multiplier according to an embodiment of the present invention.

[0037] Fig.10 FIG. 1 is a diagram showing a display panel according to another embodiment of the present invention.

[0038] Fig.11 To show Fig.10 A diagram of virtual pixels.

[0039] Fig.12 FIG. 1 is a diagram showing a touch control unit according to another embodiment of the present invention.

[0040] Fig.13 FIG. 2 is a diagram showing a switch block portion according to an embodiment of the present invention.

[0041] Fig.14 FIG. 1 is a diagram showing a touch correction circuit included in a touch generating unit according to another embodiment of the present invention. DETAILED DESCRIPTION

[0042] Hereinafter, embodiments related to the present invention are illustrated in the accompanying drawings and specifically described in detail. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and includes all changes, equivalent technical solutions or alternative technical solutions included in the concept and technical scope of the present invention.

[0043] In the process of describing the structural elements of the present invention, terms such as first, second, A, B, (a), (b) and the like may be used. Such terms are only used to distinguish between two structural elements, and the nature, sequence or order of the corresponding structural elements are not limited to the above terms. Moreover, in this specification, when a structural element is "connected", "combined" or "coupled" to other elements, its structural element may be directly connected or coupled to other structural elements, or may be "connected", "combined" or "coupled" to other structural elements between each structural element. In the case of "connection", "combination" or "coupling", it may be a physical "connection", "combination" or "coupling", and may also be an electrical "connection", "combination" or "coupling" as required.

[0044] The terms "part (unit)", "device", "component", "module" and the like in this specification mean a unit that processes at least one function or action, which can be embodied by hardware, software or a combination of hardware and software. In addition, unless otherwise stated, the terms "including", "consisting of" or "having" and the like in this specification mean that the corresponding structural elements can be built-in, and therefore, other structural elements are not excluded, but may also be included.

[0045] Moreover, the structural components in this specification are distinguished only according to the main functions of each structural component. That is, two or more structural components described below are combined into one structural component, or one structural component can also be divided into two or more structural components according to more subdivided functions. Moreover, in addition to the main functions performed by the structural components described below, they can also perform part or all of the functions performed by other structural components, and part of the main functions performed by the structural components can also be performed by other structural components.

[0046] Hereinafter, a display device with a touch sensor according to an embodiment of the present invention will be described with reference to the accompanying drawings related to the embodiment of the present invention.

[0047] Figure 1 FIG. 1 is a diagram briefly showing a display device with a touch sensor according to an embodiment of the present invention. Figure 2 FIG. 1 is a diagram showing in detail the structure of a display device with a touch sensor according to an embodiment of the present invention.

[0048] Reference Figure 1 and Figure 2 The display device with a touch sensor according to the embodiment of the present invention may include a touch sensor 100 , a display panel 210 , a display driving circuit 220 and a host 250 .

[0049] The touch sensor 100 may include a touch sensing portion 110 and a touch control portion 120 .

[0050] The touch sensing unit 110 may be located on the display panel 210 and may be used to receive a touch from a user and may include a plurality of electrodes in order to sense a change in capacitance due to the touch.

[0051] The touch control unit 120 can control the touch sensing unit 110 and sense the capacitance change of the touch sensing unit 110 , thereby detecting whether a touch event occurs and the position.

[0052] That is, the touch sensor 100 including the touch sensing unit 110 and the touch control unit 120 can operate as a capacitive touch sensor.

[0053] Such a touch sensing unit 110 may be connected to the main flexible printed circuit board 202 via a first flexible printed circuit board 201 (Flexible Printed Circuit Board). The touch control unit 120 is formed in the form of an integrated circuit (Integrated Circuit) and is located on the first flexible printed circuit board 201 .

[0054] Therefore, the touch sensing portion 110 can transmit and receive signals with the host 250 located on the main flexible printed circuit board 202 .

[0055] However, the location of the touch control unit 120 is not limited thereto, and may be located at other locations such as the main flexible printed circuit board 202 .

[0056] The display panel 210 may include a plurality of pixels, and a predetermined image may be displayed through the plurality of pixels.

[0057] For example, the display panel 210 may display images according to the control of the display driving circuit 220 .

[0058] As an example, the display panel 210 may be an organic light emitting display panel (OLED).

[0059] The display driving circuit 220 may supply a display driving signal to the display panel 210 , thereby controlling the image display operation of the display panel 210 .

[0060] The display driving circuit 220 may generate a display driving signal using digital image data DAT and a timing signal TS supplied from the outside.

[0061] For example, the display driving circuit 220 may receive image data DAT and a timing signal TS from the host 250 . The timing signal TS may include a vertical synchronization signal (Vertical Synchronization Signal), a horizontal synchronization signal (Horizontal Synchronization Signal), a main clock signal (Main Clock Signal), a data enable signal (Data Enable Signal), etc.

[0062] Furthermore, the display driving signal may include a scan signal, a data signal, and the like.

[0063] For example, the display driving circuit 220 may be formed in the form of an integrated circuit and mounted on the display panel 210. Furthermore, the display driving circuit 220 may be connected to the main flexible printed circuit board 202 through the second flexible printed circuit board 203, so that the display driving circuit 220 may transmit and receive signals with the host 250 located on the main flexible printed circuit board 202.

[0064] However, the location of the display driving circuit 220 is not limited thereto, and for example, the display driving circuit 220 may be connected to the display panel 210 via an additional structural element (eg, a flexible printed circuit board).

[0065] As shown in the figure, the touch control unit 120 and the display driving circuit 220 can be separately provided, but are not limited thereto. That is, the touch control unit 120 and the display driving circuit 220 can be combined into one chip. Also, as shown in the figure, the data processing unit 310 and the correction coefficient calculation unit 320 can be formed in the display driving circuit 220 and the touch control unit 120, respectively, but are not limited thereto.

[0066] In the case of the host 250, data can be sent and received with the touch control unit 120 and the display driving circuit 220 through an interface. For example, the host 250 and the touch control unit 120 can send and receive data through a low-frequency control interface such as I2C for transmitting touch coordinate information, and the host 250 and the display driving circuit 220 can use a high-speed data interface such as MIPI to transmit image data.

[0067] In order to realize the trend of miniaturization, lightness and flexibility of the display device, the space between the touch sensing unit 110 and the display panel 210 is reduced, thereby increasing the influence of the parasitic capacitance Cp between the touch sensing unit 110 and the display panel 210 .

[0068] This parasitic capacitance Cp mainly exists between the touch electrode included in the touch sensing unit 110 and the power supply plane 211 included in the display panel 210. A voltage drop (IRDrop) occurs on the power supply plane 211 due to pixel operation. Therefore, the touch sensing unit 110 senses display noise caused by the power supply plane 211 and cannot obtain the required touch sensing sensitivity.

[0069] Furthermore, ideally, the same noise should be expressed in all touch sensing channels. However, due to RC mismatch of each sensing line, the noise actually expressed by each sensing line is different.

[0070] Therefore, in order to further remove the noise component caused by the RC mismatch of the sensing channel, the data processing unit 310 and the touch data generating unit 122 are used in the present invention.

[0071] That is, the data processing unit 310 can use the digital image data to calculate the touch correction value of each sensing channel, and the touch data generating unit 122 can use the correction coefficient calculated by the correction coefficient calculating unit 320 to use the specified proportion of the touch correction value of each sensing channel for touch sensing compensation, thereby effectively removing the noise component caused by the RC mismatch of each sensing line.

[0072] Reference Figure 2The touch control unit 120 of the embodiment of the present invention may include a touch driving unit 121, a touch data generating unit 122 and a signal processing unit 123. In addition, the touch control unit 120 may additionally include a correction coefficient calculating unit 320.

[0073] The touch driving unit 121 may supply a touch driving signal Td to the touch sensing unit 110 in order to drive the touch sensor 100 .

[0074] The touch data generating unit 122 may include a plurality of touch correction circuits connected to the touch sensing unit 110 and may perform noise removal using a plurality of detection signals received from a plurality of detection electrodes of the touch sensing unit 110 .

[0075] In this case, the touch data generating part 122 may perform noise removal using the touch correction value of each sensing channel transferred from the data processing part 310 and the correction coefficient transferred from the correction coefficient calculating part 320 , thereby generating final touch data Dt.

[0076] The signal processing unit 123 may perform an overall control operation of the touch sensor 100 in relation to the touch operation.

[0077] The signal processing unit 123 performs a predetermined logical operation based on the touch data Dt received from the touch data generating unit 122 , thereby determining whether a touch operation is performed on the touch screen and the position where the touch operation is performed.

[0078] The correction coefficient calculation section 320 may provide a correction coefficient for a noise removal process.

[0079] On the other hand, the display driving circuit 220 of the embodiment of the present invention may include a scan driving unit 221, a data driving unit 222, and a timing control unit 223. In addition, the display driving circuit 220 may additionally include a data processing unit 310.

[0080] The scan driving part 221 may supply a scan signal to the display panel 210 , and the data driving part 222 may supply a data signal to the display panel 210 .

[0081] The timing control unit 223 may control the operations of the scan driving unit 221 and the data driving unit 222 , and for this purpose, may receive digital image data DAT and a timing signal TS from the host 250 .

[0082] The data processing unit 310 may use the digital image data to obtain the variation of the image data of each data channel, sum up the variation of the image data of each data channel to calculate the integrated data variation value, and use the integrated data variation value to calculate the touch correction value of each sensing channel.

[0083] Figure 3The following is a diagram showing a display panel and a display driving circuit according to an embodiment of the present invention in more detail.

[0084] Reference Figure 3 The display panel 210 may include a plurality of pixels PXL connected to a plurality of data lines D1 to Dm and a plurality of scan lines S1 to Sn. In this case, the plurality of pixels PXL may include light emitting devices that output light of a predetermined brightness to the outside in accordance with a data signal.

[0085] For example, in the case of a pixel PXL connected to the i-th scan line Si and the h-th data line Dh, when the scan signal is supplied to the i-th scan line Si, the pixel PXL is selected to receive the data signal from the h-th data line Dh. Thereafter, the driving transistor included in the pixel PXL may supply a current corresponding to the data signal to the organic light emitting diode, thereby generating light of a specified brightness at the organic light emitting diode.

[0086] Additionally, in Figure 3 , the pixel PXL is shown to be connected to only one data line Dh and one scan line Si, but the present invention is not limited thereto. As an example, a plurality of signal lines may be additionally connected corresponding to the driving structure of the pixel PXL. Furthermore, in the embodiment of the present invention, each pixel PXL may be implemented in a plurality of currently known forms.

[0087] The data driving unit 222 can generate a plurality of data signals using a plurality of digital image data DAT input from the timing control unit 223. The plurality of data signals generated in the data driving unit 222 can be supplied to the plurality of data lines D1 to Dm through a buffer circuit (not shown) located in each data channel. That is, the data driving unit 222 can output a plurality of data signals for each data channel, and transmit the data signals to the plurality of pixels PXL through the plurality of data lines D1 to Dm connected one-to-one to the plurality of data channels.

[0088] The scanning driving unit 221 may supply a plurality of scanning signals to the plurality of scanning lines S1 to Sn. As an example, the scanning driving unit 221 may sequentially supply scanning signals to the plurality of scanning lines S1 to Sn. If scanning signals are sequentially supplied to the plurality of scanning lines S1 to Sn, a plurality of pixels PXL may be selected in units of horizontal lines. The data signals supplied to the plurality of data lines D1 to Dm may be supplied to the plurality of pixels PXL selected by the scanning signals.

[0089] The timing control unit 223 can supply a gating signal to the scanning driving unit 221 and a data control signal to the data driving unit 222 using a timing signal TS such as the digital image data DAT, vertical synchronization signal (Vsync), horizontal synchronization signal (Hsync), data enable signal (DE), and clock signal (CLK) output from the host 250.

[0090] The gate control signal may include a gate start pulse (GSP) and one or more gate shift clocks (GSC). The gate start pulse (GSP) may control the timing of the first scan signal, and the gate shift clock (GSC) may be one or more clock signals used to shift the gate start pulse (GSP).

[0091] The data control signal may include a source start pulse (Source Start Pulse, SSP), a source sampling clock (Source Sampling Clock, SSC) and a source output enable signal (Source Output Enable, SOE) etc. The source start pulse may control the data sampling start time point of the data driving unit 222, and the source sampling clock (SSC) may control the sampling operation of the data driving unit 222 according to rising or falling. In addition, the source output enable signal (SOE) may control the output timing of the data driving unit 222.

[0092] The host 250 may supply the video data DAT to the timing control unit 223 via a predetermined interface. In addition, the host 250 may supply a plurality of timing signals (Vsync, Hsync, DE, CLK) to the timing control unit 223.

[0093] Figure 4 To show Figure 3 A diagram of an embodiment of a pixel is shown.

[0094] In particular, Figure 4 In the figure, for convenience of description, the pixel PXL connected to the i-th scan line Si and the h-th data line Dh is shown.

[0095] First, refer to Figure 4 The pixel PXL includes an organic light emitting diode (OLED) as a light emitting device and a pixel circuit PC connected to an hth data line Dh and an ith scan line Si for controlling the organic light emitting diode (OLED).

[0096] An anode electrode of the organic light emitting diode (OLED) may be coupled to the pixel circuit PC, and a cathode electrode thereof may be coupled to the second power source (ELVSS).

[0097] The organic light emitting diode (OLED) may generate light of a predetermined brightness in response to a current supplied from the pixel circuit PC.

[0098] When a scan signal is supplied to the i-th scan line Si, the pixel circuit PC may store a data signal supplied to the h-th data line Dh, and control the amount of current supplied to the organic light emitting diode (OLED) in accordance with the stored data signal.

[0099] For example, the pixel circuit PC may include a first transistor M1, a second transistor M2, and a storage capacitor Cst.

[0100] The first transistor M1 may be connected between the hth data line Dh and the second transistor M2.

[0101] For example, the gate electrode of the first transistor M1 may be coupled to the i-th scan line Si, the first electrode may be coupled to the h-th data line Dh, and the second electrode may be coupled to the gate electrode of the second transistor M2.

[0102] When a scan signal is supplied from the i-th scan line Si, the first transistor M1 may be turned on and may supply a data signal from the h-th data line Dh to the storage capacitor Cst.

[0103] In this case, the storage capacitor Cst may charge a voltage corresponding to the data signal.

[0104] The second transistor M2 may be connected between the first power source (ELVDD) and the organic light emitting diode (OLED).

[0105] For example, the gate of the second transistor M2 can be connected to the first electrode of the storage capacitor Cst and the second electrode of the first transistor M1, the first electrode is connected to the second electrode of the storage capacitor Cst and the first power source (ELVDD), and the second electrode is connected to the anode electrode of the organic light emitting diode (OLED).

[0106] The second transistor M2 is a driving transistor, and can control the amount of current flowing from the first power source (ELVDD) to the second power source (ELVSS) through the organic light emitting diode (OLED) in accordance with the voltage value stored in the storage capacitor Cst.

[0107] In this case, the organic light emitting diode (OLED) may generate light corresponding to the amount of current supplied from the second transistor M2.

[0108] The first electrode of the transistors M1 and M2 may be one of a source and a drain, and the second electrode of the transistors M1 and M2 may be another electrode different from the first electrode. For example, if the first electrode is a source, the second electrode may be a drain.

[0109] and, Figure 4 It is exemplarily shown that the plurality of transistors M1 and M2 are PMOS transistors. In other embodiments, the plurality of transistors M1 and M2 may be NMOS transistors.

[0110] Figure 5 FIG. 1 is a diagram showing a touch sensing unit and a touch control unit according to an embodiment of the present invention in more detail.

[0111] Reference Figure 5 , the touch sensing unit 110 may include a plurality of touch electrodes Tx, Rx.

[0112] For example, the plurality of touch electrodes Tx, Rx may include a plurality of driving electrodes Tx1 ˜Txj (or referred to as a plurality of transmitting electrodes) and a plurality of detecting electrodes Rx1 ˜Rxk (or referred to as a plurality of receiving electrodes).

[0113] The plurality of driving electrodes Tx1 to Txj may be formed to be elongated along a first direction (eg, X-axis direction), and may be arranged in a plurality along a second direction (eg, Y-axis direction) intersecting the first direction.

[0114] The plurality of detection electrodes Rx1 to Rxk may be formed to be elongated along the second direction (eg, the Y-axis direction), and may be arranged in plurality along the first direction (eg, the X-axis direction).

[0115] The plurality of driving electrodes Tx1 to Txj and the plurality of detecting electrodes Rx1 to Rxk may be arranged to intersect with each other, thereby being able to operate as a capacitive touch sensor.

[0116] That is, mutual capacitance may exist between the plurality of driving electrodes Tx1 -Txj and the plurality of detecting electrodes Rx1 -Rxk, and when a touch occurs on the display device, the mutual capacitance at the position related to the touch will change, and the touch position can be detected by detecting the change in capacitance.

[0117] The plurality of driving electrodes Tx1 to Txj may include a plurality of first touch detection units 411 arranged at predetermined intervals along a first direction (eg, X-axis direction) and a plurality of first connection patterns 412 electrically connecting the plurality of first touch detection units 411 to each other.

[0118] Also, the plurality of detection electrodes Rx1 to Rxk may include a plurality of second touch detection units 421 arranged at predetermined intervals along a second direction (eg, Y-axis direction) and a plurality of second connection patterns 422 electrically connecting the plurality of second touch detection units 421 to each other.

[0119] In this case, the plurality of second touch detection units 421 are dispersedly arranged between the plurality of first touch detection units 411 so as not to overlap with the plurality of first touch detection units 411 .

[0120] Figure 5 In the case where the plurality of first touch detection units 411 and the plurality of second touch detection units 421 are shown to have a polygonal shape, the shapes of the plurality of first touch detection units 411 and the plurality of second touch detection units 421 can be changed in various ways.

[0121] The plurality of driving electrodes Tx1 to Txj and the plurality of detecting electrodes Rx1 to Rxk may include a conductive material. For example, they may include a metal or an alloy thereof. The metal may be gold (Au), silver (Ag), aluminum (Al), molybdenum (Mo), chromium (Cr), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), platinum (Pt), etc.

[0122] Furthermore, the plurality of driving electrodes Tx1 to Txj and the plurality of detecting electrodes Rx1 to Rxk may be formed of a transparent conductive material. The transparent conductive material may be silver nanowire (AgNW), indium tin oxide (ITO), indium zinc oxide (IZO), antimony zinc oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), tin oxide (SnO 2 , TinOxide), carbon nanotubes (Carbon Nano Tube), graphene, etc. The plurality of driving electrodes Tx1 to Txj and the plurality of detecting electrodes Rx1 to Rxk may be formed in a single layer or multiple layers, respectively. The plurality of driving electrodes Tx1 to Txj and the plurality of detecting electrodes Rx1 to Rxk may be formed of the same material or different materials.

[0123] The plurality of driving electrodes Tx1 to Txj and the plurality of detecting electrodes Rx1 to Rxk may be disposed on a substrate (not shown). Such a substrate may be implemented as a separate substrate or may be implemented as a plurality of structural elements included in a display device. For example, the substrate may be an encapsulation layer of the display panel 210 described above.

[0124] That is, the touch sensor 100 may be designed in an On-Cell manner. For example, the touch sensing unit 110 may be disposed on the upper side of the display panel 210 .

[0125] The touch driving unit 121 may supply a touch driving signal Td to the touch sensing unit 110 in order to drive the touch sensor 100 .

[0126] For example, the touch driving unit 121 may supply the touch driving signal Td from the first driving electrode Tx1 to the jth driving electrode Txj in sequence. However, the present invention is not limited thereto, and the touch driving unit 121 may supply the touch driving signal Td in different orders in different time divisions, and may also supply the touch driving signal Td to multiple driving electrodes simultaneously according to the characteristics of the touch driving signal Td.

[0127] The touch data generating part 122 may include a plurality of touch correction circuits G1 ˜Gk that perform noise removal using a plurality of detection signals received from a plurality of detection electrodes Rx1 ˜Rxk.

[0128] The plurality of touch correction circuits G1 -Gk may be electrically connected to the plurality of detection electrodes Rx1 -Rxk, respectively, and may remove display noise from the plurality of received detection signals to generate touch data Dt1 -Dtk.

[0129] The signal processing unit 123 may perform a predetermined logic operation based on the touch data Dt1 to Dtk received from the touch data generating unit 122 , thereby determining whether a touch operation is performed on the touch screen and the position where the touch operation is performed.

[0130] Furthermore, the signal processing unit 123 may perform the control operation for the touch data generating unit 122 described above.

[0131] Figure 6 A diagram showing a data processing unit according to an embodiment of the present invention.

[0132] Reference Figure 6 The data processing unit 310 of the embodiment of the present invention may include a data change amount calculation unit 510 and a plurality of correction value calculation units R1 to Rk.

[0133] The data variation calculation unit 510 may use the digital image data DAT input from the outside to obtain the variation Va1 -Vam of the image data of each data channel, and calculate the integrated data variation value Tv by summing up the variation Va1 -Vam of the image data of each data channel.

[0134] In this case, the change amount Va1~Vam of the image data of each data channel can be determined based on the difference between the image data of each data channel when the previous scanning signal (n-1th scanning signal) based on the horizontal synchronization signal (Hsync) of each display screen is supplied and the image data of each data channel when the next scanning signal (nth scanning signal) is supplied.

[0135] As an example, the image data change Vah of the hth data channel can be calculated based on the difference between the digital image data assigned to the hth data channel corresponding to the previous scanning signal (n-1th scanning signal) and the digital image data assigned to the hth data channel corresponding to the next scanning signal (nth scanning signal).

[0136] The data change amount calculation unit 510 used therefor may include a change amount detection unit 511 and a totalization unit 512 .

[0137] The variation detection unit 511 can detect the variation Va1 to Vam of the image data of each data channel using the digital image data DAT. For example, when there are m data channels, the variation detection unit 511 can detect the variation Va1 to Vam of the image data of the m channels using the digital image data DAT of the m channels.

[0138] When the display is driven, the digital image data DAT of each data channel continuously changes, so the change amount detection unit 511 refers to the synchronization clock (CK_hsync) to continuously monitor the change amount of the image data per unit time and provides the detected change amount information to the totalization unit 512. That is, the previous horizontal period and the next horizontal period can be identified by the clock (CK_hsync) synchronized with the horizontal synchronization signal (Hsync), and the change amount Va1 to Vam of the image data of each data channel can be detected by detecting the change amount between the image data of each data channel of the previous horizontal period and the image data of each data channel of the next horizontal period and using it.

[0139] The summing unit 512 may calculate the integrated data variation value Tv by summing the variation amounts Va1 to Vam of the image data of each data channel detected by the variation amount detecting unit 511 .

[0140] The plurality of correction value calculation parts R1 ˜Rk may calculate touch correction values ​​Tr1 ˜Trk of each sensing channel for compensating for noise of each sensing channel, and provide the calculated touch correction values ​​Tr1 ˜Trk of each sensing channel to the corresponding plurality of touch correction circuits G1 ˜Gk, respectively.

[0141] The plurality of correction value calculation units R1 ˜Rk may include a modulator 521 , an integration unit 522 , and a flip-flop circuit 523 .

[0142] The modulator 521 may modulate the integrated data variation value Tv transmitted from the data variation amount calculation unit 510 and provide the modulated value to the integration unit 522. In this case, the modulator 521 may modulate the integrated data variation value Tv using the touch driving signal Td.

[0143] The integration unit 522 integrates the integrated data variation value Tv received from the modulator 521 during a preset period to calculate the touch correction values ​​Tr1 to Trk. That is, the integrated data variation value Tv can continuously change according to the horizontal period to a value that combines the image data variation amounts of all data channels into one. This change integrates the integrated data variation value Tv during a specified period, thereby estimating a value corresponding to the common display noise transmitted to the touch sensing unit 110 through the power plane 211 of the display panel 210.

[0144] In this case, the integration unit 522 may be initialized in response to the reset signal (RST) and may operate in synchronization with the synchronization clock (CK_hsync).

[0145] The flip-flop circuit 523 may be composed of at least one flip-flop, receives the touch correction value Tr1 -Trk of each sensing channel from the integration unit 522 , and generates an output signal corresponding to the sampling clock CK.

[0146] That is, the flip-flop circuit 523 may sample the received touch correction values ​​Tr1 -Trk of each sensing channel in response to the sampling clock CK and transfer the samples to the touch correction circuits G1 -Gk.

[0147] On the other hand, the synchronization clock (CK_hsync) can be set to a signal whose frequency and phase are synchronized with the horizontal synchronization signal (Hsync). In addition, the digital image data DAT used to calculate the image data variation Va1 to Vam of each data channel can be provided by the host 250 and the timing control unit 223.

[0148] Figure 7 FIG. 1 is a diagram showing a touch correction circuit according to an embodiment of the present invention. In particular, Figure 7 , a touch correction circuit Gi electrically connected to the i-th detection electrode Rxi is shown.

[0149] Reference Figure 7 The touch correction circuit Gi of the embodiment of the present invention may include an amplifier 620 , an analog-to-digital converter 630 , and a noise removal unit 640 .

[0150] The amplifier 620 may be connected to the i-th detection electrode Rxi and may output a sensing signal Vs reflecting the capacitance change of the i-th detection electrode Rxi. That is, the amplifier 620 is an amplifier circuit with a predetermined voltage gain and may be used to detect the capacitance change of the i-th detection electrode Rxi.

[0151] In this case, the amplifying unit 620 may include an amplifier 621 , a resistor Rf, and a capacitor Cf.

[0152] For example, a first input terminal of the amplifier 621 may be connected to the i-th detection electrode Rxi, and a second input terminal of the amplifier 621 may receive an input signal Vin having a specified frequency.

[0153] The input signal Vin may be a signal having a predetermined period (for example, a square wave or a sine wave), and the level and frequency of the input signal Vin may be appropriately adjusted.

[0154] Furthermore, a capacitor Cf may be connected between the first input terminal and the output terminal of the amplifier 621 , and a resistor Rf may be connected in parallel with the capacitor Cf.

[0155] In this case, the first input terminal of the amplifier 621 may be an inverting input terminal (−), and the second input terminal of the amplifier 621 may be a non-inverting input terminal (+).

[0156] The analog-to-digital converter 630 may receive the sensing signal Vs from the amplifier 620, and may convert the received sensing signal Vs into a digital signal for output. In this case, the analog-to-digital converter 630 may perform a sampling operation for the sensing signal Vs corresponding to the sampling clock CK, and for sampling synchronization, the trigger circuits 523 of the plurality of correction value calculation units R1 to Rk and the analog-to-digital converter 630 may synchronize and operate at the same sampling clock CK.

[0157] The noise removal unit 640 may calculate the touch data Dti by deducting the product of the touch correction value Tri of the corresponding trigger circuit 523 and the correction coefficient a from the sensing signal Vs received from the analog-to-digital converter 630 . This can be expressed by the following mathematical formula.

[0158] Dti=Vs-a×Tri

[0159] Here, only the noise compensation method for the sensing channel related to the i-th detection electrode Rxi is described, and the noise compensation for the sensing channels related to the other multiple detection electrodes can also be implemented in the same way. That is, the multiple touch correction circuits G1~Gk can respectively use the touch correction values ​​Tr1~Trk of each sensing channel transmitted from the corresponding multiple correction value calculation units R1~Rk multiplied by a specified ratio as touch sensing compensation, thereby effectively removing the noise components caused by the RC mismatch of each sensing line.

[0160] The correction coefficient a for touch sensing compensation may be calculated by the correction coefficient calculation part 320 .

[0161] As an example, the correction coefficient calculation unit 320 may use a least mean square (LMS) algorithm to update the correction coefficient a to minimize the display noise.

[0162] The correction coefficient calculation unit 320 does not use the known least mean square algorithm, but can calculate the correction coefficient a by other methods, which will be described later.

[0163] On the other hand, an additional demodulator (not shown) may be added to the touch correction circuit Gi as needed. In this case, the configuration structure of the demodulator may be designed in a variety of ways.

[0164] Figure 8 This is a diagram showing a data processing unit of another embodiment of the present invention. Figure 6 Description of the contents repeated in the related embodiments.

[0165] Reference Figure 8 In another embodiment of the present invention, the data processing unit 310' may include a data variation calculation unit 510' and a plurality of correction value calculation units R1'-Rk'.

[0166] The data variation calculation unit 510 ′ may include a gamma compensation unit 515 , a variation detection unit 511 , and a totalization unit 512 .

[0167] The data signals supplied to the plurality of pixels PXL of the actual display panel 210 may be selected from gradient voltages corresponding to a specific gamma curve. In this case, the digital image data DAT may be converted into gradient voltage values ​​corresponding thereto through a preset gamma lookup table (LUT).

[0168] The gamma compensation part 515 performs gamma correction on the digital image data DAT in a manner corresponding to the gamma correction operation implemented in such a display panel 210. Specifically, the gamma compensation part 515 may generate gamma-corrected digital image data DAT' with reference to a preset gamma table LUT.

[0169] The variation detection unit 511 can detect the variation Va1-Vam of the image data of each data channel by using the digital image data DAT' corrected by the gamma compensation unit 515. That is, the variation between the image data of each data channel of the previous horizontal period and the image data of each data channel of the next horizontal period can be detected and used to detect the variation Va1-Vam of the image data of each data channel.

[0170] The summing unit 512 may calculate the integrated data variation value Tv by summing the variation amounts Va1 to Vam of the image data of each data channel detected by the variation amount detecting unit 511 .

[0171] The plurality of correction value calculation parts R1 ′ to Rk′ may calculate the touch correction values ​​Tr1 to Trk of each sensing channel for compensating for the noise of each sensing channel, and may provide the calculated touch correction values ​​Tr1 to Trk of each sensing channel to the corresponding plurality of touch correction circuits G1 to Gk, respectively.

[0172] The plurality of correction value calculation units R1 ˜Rk may include a filter unit 525 , a modulator 521 , an integration unit 522 and a flip-flop circuit 523 .

[0173] The filter unit 525 may be connected to the output terminal of the summing unit 512 , and may perform a function of modeling the impulse response of the touch sensor 100 .

[0174] That is, display noise affects multiple cycles, not just one cycle, so a filter is needed that can predict or anticipate this effect.

[0175] As an example, the filter unit 525 may be a finite impulse response filter or an infinite impulse response filter as a digital filter. Furthermore, the impulse response characteristics of each sensing channel are different, and therefore, the characteristics of each filter unit 525 of the plurality of correction value calculation units R1' to Rk' may also be different according to the channel.

[0176] Such a filter unit 525 can perform a digital filtering operation on the integrated data variation value Tv, and can transmit the filtered integrated data variation value Tv to the modulator 521 .

[0177] The modulator 521 may modulate the integrated data variation value Tv transmitted from the data variation amount calculation unit 510 and provide the modulated value to the integration unit 522. In this case, the modulator 521 may modulate the integrated data variation value Tv using the touch driving signal Td.

[0178] The integrator 522 integrates the integrated data variation value Tv received from the modulator 521 during a preset period to calculate the touch correction values ​​Tr1 to Trk.

[0179] The flip-flop circuit 523 may be composed of at least one flip-flop, receives the touch correction value Tr1 -Trk of each sensing channel from the integration unit 522 , and generates an output signal corresponding to the sampling clock CK.

[0180] That is, the flip-flop circuit 523 samples the received touch correction values ​​Tr1 to Trk of each sensing channel in response to the sampling clock CK and transmits the samples to the touch correction circuits G1 to Gk.

[0181] Fig. 9 FIG. 2 is a diagram showing a frequency multiplier according to an embodiment of the present invention. Fig. 9 The display device with a touch sensor according to the embodiment of the present invention may additionally include a frequency multiplier 710 (Frequency Multiplier).

[0182] In this case, the frequency multiplier 710 may receive a horizontal synchronization signal (Hsync) from the outside and output the clock CK as an output signal.

[0183] As an example, the frequency multiplier 710 may be implemented as a frequency multiplier based on a phase locked loop (PLL) or a delay locked loop (DLL).

[0184] In this case, the clock CK generated by the frequency multiplier 710 may be used as the sampling clock CK for controlling the sampling control of the flip-flop circuit 520 and the analog-to-digital converter 630 described above.

[0185] In this case, the sampling clock CK may have a lower frequency than the horizontal synchronization signal (Hsync) and the synchronization clock (CK_hsync).

[0186] Fig.10 FIG. 1 is a diagram showing a display panel according to another embodiment of the present invention. Fig.11 To show Fig.10 In particular, Fig.11 In the figure, for the convenience of explanation, a virtual pixel PXD connected to the nth scan line Sn and the mth data line Dm is shown.

[0187] Reference Fig.10 The display panel 210' according to another embodiment of the present invention may include a plurality of dummy pixels PXD having no light emitting devices in addition to the plurality of pixels PXL having light emitting devices.

[0188] That is, Fig.11 As shown, in the case of the virtual pixel PXD, no additional light-emitting device is included, and therefore, the non-light-emitting state can be maintained even when driven normally.

[0189] For example, the dummy pixel PXD may have the same pixel circuit PC as the normal pixel PXL described above, thereby generating a driving current corresponding to a data signal applied in the same manner as the normal pixel PXL.

[0190] Therefore, when the plurality of dummy pixels PXD are driven, display noise occurs in a similar form to the driving of the plurality of normal pixels PXL, based on which the correction coefficient calculation part 320 may calculate the correction coefficient a for touch sensing compensation.

[0191] For example, during the driving period of multiple virtual pixels PXD, the data change calculation unit 510 of the data processing unit 310 uses the digital image data DAT transmitted from the outside to calculate the change in image data of each data channel related to the multiple virtual pixels PXD, and calculates the virtual data change value by summing up the change in image data of each data channel related to the above-mentioned multiple virtual pixels.

[0192] In this case, the calculation method of the virtual data change value is the same as that of the integrated data change value Tv described above, and therefore, a detailed description thereof will be omitted.

[0193] Furthermore, the plurality of correction value calculation units R1 to Rk of the data processing unit 310 may calculate a virtual correction value of each sensing channel using the virtual data variation value calculated by the data variation calculation unit 510 .

[0194] In this case, the calculation method of the virtual correction value of each sensing channel is the same as the touch correction value Tr1 ˜Trk of each sensing channel described above, and therefore, a detailed description thereof will be omitted.

[0195] Moreover, during the driving period of multiple virtual pixels PXD, the analog-to-digital converters 630 included in the multiple touch correction circuits G1~Gk can respectively output first signals, and during the display non-driving period when multiple pixels PXL and multiple virtual pixels PXD are not working, the analog-to-digital converters 630 included in the multiple touch correction circuits G1~Gk can respectively output second signals.

[0196] The difference between the first signal and the second signal outputted from the analog-to-digital converter 630 corresponds to the display noise. Therefore, the correction coefficient calculation unit 320 may calculate the correction coefficient a using the virtual correction value of each sensing channel, the first signal, and the second signal.

[0197] That is, the correction coefficient calculation unit 320 may calculate the correction coefficient a of each sensing channel by dividing the difference between the first signal and the second signal by the virtual correction value.

[0198] The correction coefficient calculation method of the virtual pixel PXD described above can be additionally used in the case where the noise of the actual power plane (ELVDD / ELVSS) related to the data variation cannot be interpreted as the data variation.

[0199] Fig.12 This is a diagram showing a touch control unit according to another embodiment of the present invention. Figure 5 Description of the relevant examples and repetitive content.

[0200] Reference Fig.12 In another embodiment of the present invention, the touch control unit 120 ′ may include a touch driving unit 121 , a switch block unit 125 , a touch data generating unit 122 ′ and a signal processing unit 123 .

[0201] The touch driving unit 121 may supply a touch driving signal Td to the touch sensing unit 110 in order to drive the touch sensor 100 .

[0202] The switch block 125 is connected between the touch sensing unit 110 and the touch data generating unit 122 ′, and can control the electrical connection state between the plurality of detection electrodes Rx1 ˜Rxk and the plurality of touch correction circuits G1 ˜Gp.

[0203] As an example, the switch block unit 125 may electrically connect each of the touch correction circuits G1 to Gp to two detection electrodes.

[0204] The touch data generating part 122 ′ may include a plurality of touch correction circuits G1 ˜Gp to perform noise removal using a plurality of detection signals received from two adjacent detection electrodes.

[0205] The plurality of touch correction circuits G1 -Gp may be electrically connected to two adjacent detection electrodes, respectively, and may remove display noise from the plurality of received detection signals to generate touch data Dt1 -Dtp.

[0206] The signal processing unit 123 performs a logic operation based on the touch data Dt1 to Dtp received from the touch data generating unit 122 ′, thereby determining whether a touch operation is performed on the touch screen and the position where the touch operation is performed.

[0207] Furthermore, the signal processing unit 123 may perform a control operation on the touch data generating unit 122 ′ and / or the switch block unit 125 described above.

[0208] Fig.13 FIG. 2 is a diagram showing a switch block portion according to an embodiment of the present invention.

[0209] Reference Fig.13 The switch block 125 of the embodiment of the present invention may include a plurality of multiplexers (MUX1, MUX2, ...) having an input-output ratio of 3:2.

[0210] In this case, a plurality of multiplexers (MUX1, MUX2, . . . ) may electrically connect each of the touch correction circuits G1 to Gp to two adjacent detection electrodes.

[0211] For example, the first multiplexer MUX1 may electrically connect the adjacent first detection electrode Rx1 and the second detection electrode Rx2 to the first touch correction circuit G1 , or may electrically connect the adjacent second detection electrode Rx2 and the third detection electrode Rx3 to the first touch correction circuit G1 .

[0212] The operation of the first multiplexer MUX1 can be performed alternately in different periods. For example, in the first period, the first detection electrode Rx1 and the second detection electrode Rx2 are electrically connected to the first touch correction circuit G1. In the second period, the second detection electrode Rx2 and the third detection electrode Rx3 are electrically connected to the first touch correction circuit G1.

[0213] Here, the first multiplexer MUX1 is mainly described, but other multiplexers can also be configured and operated in the same manner.

[0214] Fig.14 FIG. 1 is a diagram showing a touch correction circuit included in a touch generating unit according to another embodiment of the present invention. Fig.14 , a touch correction circuit Gr electrically connected to the i-th detection electrode Rxi and the i+1-th detection electrode Rxi+1 is shown.

[0215] The touch correction circuit Gr can be electrically connected to the two adjacent detection electrodes Rxi and Rxi+1 through the multiplexer MUX described above.

[0216] The touch correction circuit Gr may include a demodulator 610 , a differential amplifier 620 ′, an analog-to-digital converter 630 , and a noise removal unit 640 .

[0217] The demodulator 610 can be electrically connected to the i-th detection electrode Rxi and the i+1-th detection electrode Rxi+1 at adjacent positions through the multiplexer MUX, and can receive the i+1-th detection signal from the i-th detection electrode Rxi and the i+1-th detection electrode Rxi+1, respectively.

[0218] Furthermore, the demodulator 610 may perform a demodulation operation on the received i-th detection signal and (i+1)-th detection signal using the touch driving signal Td.

[0219] By the demodulation operation based on the demodulator 610, the noise components included in each detection signal become high-frequency noise components with a frequency greater than the existing frequency, and the signal components other than the noise components can be converted into a DC component signal of a specified level.

[0220] Furthermore, the demodulator 610 may supply the demodulated i-th detection signal and i+1-th detection signal to the differential amplifier 620 ′.

[0221] The differential amplifier 620 ′ may receive the demodulated i-th detection signal and the (i+1)-th detection signal from the demodulator 610 to output a sensing signal Vo.

[0222] To this end, the differential amplifying section 620 ′ may include an amplifier 621 ′, a first switch SW1 , a first capacitor C1 , a second switch SW2 , and a second capacitor C2 .

[0223] The first switch SW1 and the first capacitor C1 may be connected in parallel between the inverting input terminal and the non-inverting output terminal of the amplifier 621 ′, and the second switch SW2 and the second capacitor C2 may be connected in parallel between the non-inverting input terminal and the inverting output terminal of the amplifier 621 ′.

[0224] As an example, the amplifier 621 ′ may be implemented as a fully differential amplifier (Fully DifferentialAmplifier).

[0225] The differential amplifier 620 ′ may filter high frequency noise components from the demodulated ith detection signal and the (i+1)th detection signal, integrate charges corresponding to the ith detection signal and the (i+1)th detection signal from which the high frequency noise components are filtered, and generate a sensing signal Vo based thereon.

[0226] The differential amplifier 620' may be initialized by turning on the first switch SW1 and the second switch SW2. In this case, in order to synchronize with the integration unit 513 included in the data processing unit 310, the differential amplifier 620' and the integration unit 513 may be initialized at the same timing.

[0227] The analog-to-digital converter 630 may receive the sensing signal Vo from the differential amplifier 620 ′ and convert the received sensing signal Vo into a digital signal for output.

[0228] In this case, the analog-to-digital converter 630 may perform a sampling operation on the sensing signal Vo corresponding to the sampling clock CK. For sampling synchronization, the flip-flop circuit 520 and the analog-to-digital converter 630 may be synchronized and operate at the same sampling clock CK.

[0229] The noise removal unit 640 may calculate the touch data Dtr by deducting the product of the touch correction value Trr of the corresponding flip-flop circuit 523 and the correction coefficient a from the sensing signal Vo received from the analog-to-digital converter 630. This may be expressed as the following mathematical formula.

[0230] Dtr=Vo-a×Trr

[0231] Here, only the noise compensation method for the sensing channels related to the i-th detection electrode Rxi and the i+1-th detection electrode Rxi+1 is described, and the noise compensation for the sensing channels related to other detection electrodes can also be performed in the same manner.

[0232] The compensation coefficient a for touch detection compensation may be calculated by the correction coefficient calculation unit 320. As described above, a detailed description thereof is omitted here.

[0233] A person skilled in the art of the present invention may implement the present invention into other specific forms without changing the technical concept or essential features of the present invention. Therefore, the embodiments described above are illustrative embodiments in all aspects and are not intended to limit the present invention. The scope of the present invention is presented by the scope of the invention claims described later, rather than by the above detailed description, and all changes or deformations derived from the meaning, scope and equivalent concepts of the scope of the invention claims are within the scope of the present invention.

Claims

1. A display device having a touch sensor, characterized in that: include: A display panel connected to the plurality of data lines and the plurality of scan lines, including a plurality of pixels each having a light emitting device; A scanning driving unit supplies a plurality of scanning signals to the plurality of pixels through the plurality of scanning lines; A data driving unit receives digital image data, converts the digital image data into analog data signals, and supplies the analog data signals to the multiple pixels through the multiple data lines; A data variation calculation unit, which uses the digital image data to obtain the variation of the image data of each data channel, and calculates the integrated data variation value by summing up the variation of the image data of each data channel; A plurality of correction value calculation units, using the integrated data variation value to calculate a touch correction value for each sensing channel; A touch sensing portion, comprising a plurality of driving electrodes and a plurality of detecting electrodes intersecting each other; A touch driving unit that supplies a touch driving signal to the plurality of driving electrodes; and a plurality of touch correction circuits, which perform noise removal for each sensing channel using the plurality of detection signals received from the touch sensing unit and the touch correction value for each sensing channel received from the correction value calculation unit; The data change amount calculation unit includes: a change amount detection unit, which uses the digital image data to detect the change amount of the image data of each data channel between the previous horizontal period and the next horizontal period; and a variation aggregating unit for aggregating the variation of the image data of each data channel detected by the variation detecting unit to calculate the integrated data variation value; Each of the above correction value calculation units includes: A modulator, used for modulating the integrated data change value; an integration unit, which integrates the integrated data variation value received from the modulator during a preset period to calculate a touch correction value; and The trigger circuit receives the touch correction value and supplies the touch correction value to the corresponding touch correction circuit in response to the sampling clock.

2. The display device with a touch sensor according to claim 1, characterized in that: The modulator performs modulation using the touch driving signal.

3. The display device with a touch sensor according to claim 1, characterized in that: Each of the above touch correction circuits includes: an amplifier connected to at least one detection electrode and outputting a sensing signal reflecting a capacitance change of the detection electrode; an analog-to-digital converter, which converts the sensing signal of the amplifying unit into a digital signal for output; and The noise removal unit calculates touch data by deducting a product value of a touch correction value of a corresponding trigger circuit and a correction coefficient from the sensing signal received from the analog-to-digital converter.

4. The display device with a touch sensor according to claim 1, characterized in that: Each of the above touch correction circuits includes: a demodulator for demodulating an i-th detection signal and an i+1-th detection signal received from adjacent i-th detection electrodes and i+1-th detection electrodes; a differential amplifier receiving the demodulated i-th detection signal and i+1-th detection signal from the demodulator to output a sensing signal; an analog-to-digital converter, converting the sensing signal into a digital signal for output; and The noise removal unit calculates touch data by deducting a product value of a touch correction value of a corresponding trigger circuit and a correction coefficient from the sensing signal received from the analog-to-digital converter.

5. The display device with a touch sensor according to claim 3 or 4, characterized in that: The analog-to-digital converter performs a sampling operation in response to the sampling clock.

6. The display device with a touch sensor according to claim 4, characterized in that: The demodulator uses the touch driving signal to perform demodulation of the i-th detection signal and the (i+1)-th detection signal.

7. The display device with a touch sensor according to claim 5, characterized in that: The above sampling clock is synchronized with the horizontal synchronization signal.

8. The display device with a touch sensor according to claim 7, characterized in that: It also includes a frequency multiplier, which receives the horizontal synchronization signal as an input signal and outputs the sampling clock as an output signal.

9. The display device with a touch sensor according to claim 3 or 4, characterized in that: The system further comprises a correction coefficient calculation unit for calculating the correction coefficient.

10. The display device with a touch sensor according to claim 9, characterized in that: The correction coefficient calculation unit updates the correction coefficient using a least mean square algorithm.

11. The display device with a touch sensor according to claim 9, characterized in that: The display device includes a plurality of virtual pixels without the light emitting device. During the driving period of the plurality of virtual pixels, the data change amount calculation unit uses the digital image data to obtain the change amount of the image data of each data channel related to the plurality of virtual pixels, and calculates the virtual data variation value by summing up the change amount of the image data of each data channel related to the plurality of virtual pixels. The plurality of correction value calculation units calculate a virtual correction value for each sensing channel using the virtual data variation value. The correction coefficient calculation unit calculates the correction coefficient of each sensing channel by using the virtual correction value of each sensing channel, the first signal output from the analog-to-digital converter during the driving period of the multiple virtual pixels, and the second signal output from the analog-to-digital converter during the non-driving period of the multiple pixels and the multiple virtual pixels.

12. A display device having a touch sensor, characterized in that: include: A display panel connected to the plurality of data lines and the plurality of scan lines, including a plurality of pixels each having a light emitting device; A scanning driving unit supplies a plurality of scanning signals to the plurality of pixels through the plurality of scanning lines; A data driving unit receives digital image data, converts the digital image data into analog data signals, and supplies the analog data signals to the multiple pixels through the multiple data lines; A data variation calculation unit, which uses the digital image data to obtain the variation of the image data of each data channel, and calculates the integrated data variation value by summing up the variation of the image data of each data channel; A plurality of correction value calculation units, using the integrated data variation value to calculate a touch correction value for each sensing channel; A touch sensing portion, comprising a plurality of driving electrodes and a plurality of detecting electrodes intersecting each other; A touch driving unit that supplies a touch driving signal to the plurality of driving electrodes; and a plurality of touch correction circuits, which perform noise removal for each sensing channel using the plurality of detection signals received from the touch sensing unit and the touch correction value for each sensing channel received from the correction value calculation unit; The data change amount calculation unit includes: A gamma compensation unit, for gamma correcting the digital image data with reference to a preset gamma table; a change amount detection unit, which detects a change amount of the image data of each data channel between a previous horizontal period and a next horizontal period using the digital image data corrected by the gamma compensation unit; and a variation aggregating unit for aggregating the variation of the image data of each data channel detected by the variation detecting unit to calculate the integrated data variation value; Each of the above correction value calculation units includes: A filtering unit, which performs digital filtering on the integrated data variation value; A modulator for modulating the integrated data variation value transmitted through the filter unit; an integration unit, which integrates the integrated data variation value received from the modulator during a preset period to calculate a touch correction value; and The trigger circuit receives the touch correction value and supplies the touch correction value to the corresponding touch correction circuit in response to the sampling clock.

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