Touch-sensing display device and driving method thereof

Abstract

Disclosed is a touch-sensing display device that improves touch noise characteristics during moving image driving and a driving method thereof. A touch-sensing display device includes a display panel including a plurality of touch electrodes and a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines, a timing controller configured to output an average data value and a touch synchronization signal in which a plurality of display driving periods and a plurality of touch driving periods are alternately divided in time, a touch controller configured to output a charge cancellation capacitance compensation value, a charge cancellation voltage compensation value, and a gain compensation value according to the average data value, a power supply controller configured to output a charge cancellation voltage according to the charge cancellation voltage compensation value, and a touch driving circuit configured to sense a touch signal from each touch electrode according to the charge cancellation voltage, the charge cancellation capacitance compensation value, and the gain compensation value, and output a touch sensing value.

Description

Technical Field

[0001] This invention relates to a touch-sensing display device and its driving method. Background Technology

[0002] With the development of multimedia, the importance of flat panel displays is increasing. In response, flat panel displays such as liquid crystal displays (LCDs) and organic light-emitting diode displays (OLEDs) have been commercialized.

[0003] These flat panel displays are widely used as portable display devices due to their advantages such as excellent image quality, light weight, thinness and low power consumption, and are especially widely used in laptops, computer monitors, televisions and the like.

[0004] Touch-sensing display devices are already widely used, in which a touch panel is overlaid on a flat panel display to detect touch points touched by a hand or stylus, and output information corresponding to the touch point or perform calculations when the electrical characteristics, such as resistance or capacitance, change at the touch point. These touch-sensing display devices serve as user interfaces, and their applications have expanded to include small portable terminals, office equipment, and mobile devices.

[0005] However, when a separate touch panel is stacked on a display device, the thickness of the touch-sensing display device increases, which leads to drawbacks such as limitations in manufacturing thin display devices, reduced light transmission efficiency when passing through the stacked touch panels, and increased production costs. To address these issues, an advanced in-cell touch (AIT) type touch-sensing display device has recently been proposed, in which the touch sensor is embedded in the pixel area of ​​the display device.

[0006] In a touch-sensing display device where the touch sensor is embedded in the pixel area, the touch sensor can be mounted on the display panel without increasing the thickness of the display panel. To reduce mutual interference caused by the coupling between the pixels and the touch sensor, this touch-sensing display device uses a method that temporally divides a display driving period for driving the pixels and a touch driving period for driving the touch sensor.

[0007] In this case, the touch sensing signal is integrated by an amplification circuit to improve the touch sensitivity of the display panel and eliminate touch sensing noise. A charge elimination circuit that eliminates the charging voltage of the amplification circuit is also used to prevent the sensing signal of the amplification circuit from saturating.

[0008] However, the noise characteristics are greater when displaying moving images than when displaying still images, and in some cases the window does not move due to noise when moving the moving image while driving the window in a small window. Summary of the Invention

[0009] Therefore, the present invention relates to a touch-sensing display device and a driving method thereof, which substantially eliminates one or more problems caused by the limitations and disadvantages of related technologies.

[0010] The purpose of this invention is to provide a touch-sensing display device and its driving method, which improves the touch noise characteristics when driving moving images.

[0011] Other advantages, objects, and features of the invention will be set forth in part in the description which follows, and will become apparent to those skilled in the art upon review of the following, or may be learned by practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, its claims, and the accompanying drawings.

[0012] To achieve these objectives and other advantages, and in accordance with the purposes of the invention, as embodied and broadly described herein, a touch-sensing display device includes: a display panel including a plurality of touch electrodes and a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines; a timing controller configured to output an average data value and a touch synchronization signal wherein a plurality of display driving periods and a plurality of touch driving periods are alternately divided in time; a touch controller configured to output a charge elimination capacitor compensation value, a charge elimination voltage compensation value, and a gain compensation value based on the average data value; a power controller configured to output a charge elimination voltage based on the charge elimination voltage compensation value; and a touch driving circuit configured to sense touch signals from each touch electrode based on the charge elimination voltage, the charge elimination capacitor compensation value, and the gain compensation value, and to output a touch sensing value.

[0013] In another aspect of the present invention, a driving method for a touch-sensing display device includes: storing a charge elimination capacitor compensation value, a charge elimination voltage compensation value, and a gain compensation value based on an average data value in a lookup table; outputting a touch synchronization signal and an average data value wherein a plurality of display driving periods and a plurality of touch driving periods are alternately divided in time; outputting the charge elimination capacitor compensation value, the charge elimination voltage compensation value, and the gain compensation value based on the average data value; outputting a charge elimination voltage based on the charge elimination voltage compensation value; changing the capacitance of a charge elimination capacitor based on the charge elimination capacitor compensation value, changing the capacitance of a feedback capacitor based on the gain compensation value, amplifying a touch signal from each touch electrode based on the charge elimination voltage, the changed capacitance of the charge elimination capacitor, and the changed capacitance of the feedback capacitor, and outputting a touch sensing value.

[0014] It should be understood that the foregoing general description and the following detailed description of the invention are exemplary and illustrative, and are intended to provide further explanation of the claimed invention. Attached Figure Description

[0015] The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings:

[0016] Figure 1 This is a configuration block diagram of a touch sensing display device according to an embodiment of the present invention;

[0017] Figure 2 This is a detailed configuration diagram of the touch driving circuit 130 and the touch panel TSP according to an embodiment of the present invention;

[0018] Figure 3 This is an example diagram illustrating the timing of the display driving period DP and the touch driving period TP of a touch sensing display device according to an embodiment of the present invention;

[0019] Figure 4 This is an example diagram of a touch synchronization signal according to an embodiment of the present invention;

[0020] Figure 5 This is an illustration of the input / output signals of a touch drive circuit SRIC 130, a timing controller T-CON 140, and a touch controller 150 for improving touch noise characteristics during motion picture driving in a touch-sensing display device according to an embodiment of the present invention.

[0021] Figure 6 This is an explanatory diagram of the lookup table for the touch controller 150;

[0022] Figure 7 This is a circuit configuration diagram of a touch driving circuit SRIC in a touch sensing display device according to an embodiment of the present invention; and

[0023] Figure 8 This is a graph showing the output voltage of the touch driver circuit SRIC relative to the gray level. Detailed Implementation

[0024] The advantages and features of the present invention, as well as the methods for achieving these advantages and features, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and these embodiments are provided only to complete the disclosure of the present invention and are intended to fully inform those skilled in the art of the scope of the invention. Furthermore, the present invention is defined only by the scope of the claims.

[0025] The shapes, dimensions, proportions, angles, quantities, etc., disclosed in the accompanying drawings used to describe embodiments of the present invention are illustrative, and therefore the present invention is not limited to the elements shown. Throughout the specification, the same reference numerals denote the same elements. Furthermore, in describing the present invention, detailed descriptions of related known technologies will be omitted when it is determined that such detailed descriptions may unnecessarily obscure the subject matter of the present invention.

[0026] When terms such as "equipped with," "including," "having," or "comprising" are used in this specification, other components may also be present unless "only" is used. When an element is expressed in the singular, it may be interpreted as plural unless otherwise expressly stated.

[0027] When interpreting elements in embodiments of the present invention, even without their individual explicit description, they should be interpreted as including a range of error.

[0028] Furthermore, in describing the elements of the present invention, terms such as first, second, A, B, (a), (b) may be used. These terms are only used to distinguish these elements from other elements, and the nature, sequence, order, quantity, etc., of these elements are not limited by these terms. When an element is described as "linked," "connected," or "attached" to another element, the element may be directly linked or connected to the other element. However, it should be understood that another element may be "inserted" between corresponding elements, or each element may be "linked," "connected," or "attached" through another element. In describing positional relationships, for example, when using terms such as "above," "over," "below," or "beside" to describe the positional relationship between two components, one or more other components may be located between these two components, unless "immediately adjacent" or "directly" is used.

[0029] The elements in the embodiments of this invention are not limited by these terms. These terms are used only to distinguish one element from another. Therefore, within the spirit of this invention, the first element mentioned below can be a second element.

[0030] The features (configurations) in the embodiments of the present invention can be combined or associated with each other, or separated from each other, and can be technically interlocked and driven in various ways. The various embodiments can be implemented independently of each other, or they can be implemented together in an interrelated relationship.

[0031] In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0032] Figure 1 This is a block diagram illustrating the configuration of a touch-sensing display device according to an embodiment of the present invention.

[0033] like Figure 1 As shown, the touch sensing display device according to an embodiment of the present invention may include a display panel DP, a gating drive circuit 110, a data drive circuit 120, a touch drive circuit SRIC 130, a timing controller T-CON 140, and a touch controller 150.

[0034] The display panel DP displays images based on the scan signal SCAN transmitted from the gating drive circuit 110 via the gating line GL and the data signal Vdata transmitted from the data drive circuit 120 via the data line DL.

[0035] The display panel DP includes multiple sub-pixels SP defined by multiple data lines DL and multiple gate lines GL.

[0036] When the display panel DP is a liquid crystal display panel, a sub-pixel SP may include a thin film transistor (TFT) for supplying the data voltage Vdata of the data line DL to the pixel electrode according to the scan signal of the gate line GL, and a storage capacitor Cst for charging the data voltage Vdata and maintaining the data voltage Vdata for one frame.

[0037] When the display panel DP is an organic light-emitting display panel, a sub-pixel SP may include an organic light-emitting diode (OLED), a switching transistor for providing the data voltage of the data line DL, a driving transistor for controlling the current flowing through the OLED according to the data voltage provided by the switching transistor, and a capacitor Cst that charges the data voltage Vdata and maintains the data voltage Vdata for one frame.

[0038] Additionally, the display panel DP may include a touch panel that embeds a pixel array using an in-cell self-touch scheme. The touch panel includes a touch sensor (electrodes). A detailed description of the touch panel will be given later.

[0039] The timing controller 140 controls the gating drive circuit 110 and the data drive circuit 120. The timing controller 140 is provided with image data Vdata and timing signals (e.g., vertical synchronization signal Vsync, horizontal synchronization signal Hsync, data enable signal DE, and master clock MCLK) from the host system (not shown).

[0040] The timing controller 140 controls the gating drive circuit 110 based on scan timing control signals (e.g., gating start pulse GSP, gating shift clock, and gating output enable signal GOE). Furthermore, the timing controller 140 controls the data drive circuit 120 based on data timing control signals (e.g., source sampling clock SSC, polarity control signal POL, and source output enable signal SOE).

[0041] The gating drive circuit 110 sequentially drives multiple gating lines GL by providing scan signals SCAN to the display panel DP sequentially via multiple gating lines GL. Here, the gating drive circuit 110 is also referred to as a scan drive circuit or a gating drive integrated circuit GDIC.

[0042] Under the control of the timing controller 140, the gating drive circuit 110 sequentially provides a scan signal SCAN, which indicates the on or off voltage, to multiple gating lines GL. Therefore, the gating drive circuit 110 may include a shift register, a level shifter, etc.

[0043] Depending on the circumstances, the selection drive circuit 110 may be located only on one side of the display panel DP (e.g., the left or right side), or it may be located on both sides of the display panel DP.

[0044] The data driver circuit 120 receives image data Vdata from the timing controller 140 and provides the analog image data voltage corresponding to the image data to multiple data lines DL, thereby driving the multiple data lines DL. Here, the data driver circuit 120 is also referred to as a source driver circuit or a source driver integrated circuit SDIC.

[0045] When a specific gating line GL is enabled by the gating drive circuit 110, the data drive circuit 120 converts the image data Vdata received from the timing controller 140 into an analog image data voltage and provides the analog image data voltage to multiple data lines DL.

[0046] Depending on the driving scheme, design scheme, etc., the data driving circuit 120 may be located only on one side of the display panel DP (e.g., the upper or lower side), or it may be located on both sides of the display panel DP.

[0047] The data drive circuit 120 may include a shift register, a latch circuit, a digital-to-analog converter (DAC), an output buffer, etc. Here, the DAC is configured to convert the image data Vdata received from the timing controller 140 into an analog image data voltage to be provided to the data line DL.

[0048] The touch driving circuit 130 senses the presence and location of a touch on the display panel DP. The touch driving circuit 130 includes a driving circuit that generates a driving voltage for driving the touch sensor, and a sensing circuit that senses the touch sensor and generates data, coordinate information, etc., for detecting the presence or absence of a touch. The driving circuit and sensing circuit of the touch driving circuit 130 can be in the form of a single integrated circuit (IC), or they can be divided and separated according to their functions.

[0049] The touch driving circuit 130 can be formed on an external substrate connected to the display panel DP. The touch driving circuit 130 is connected to the display panel DP via multiple sensing lines SL. The touch driving circuit 130 can sense the presence and location of a touch based on the capacitance difference between touch sensors formed on the display panel DP. That is, a capacitance deviation exists between the location touched by the user's finger and the non-contact location, and the touch driving circuit 130 uses a scheme to detect this capacitance deviation to sense the presence and location of a touch.

[0050] The touch driving circuit 130 generates a touch sensing signal based on the presence and location of the touch, and sends the touch sensing signal to the touch controller 150.

[0051] Touch controller 150 controls touch driver circuit 130. Touch controller 150 receives control synchronization signals Vsync and Tsync from timing controller 140, and controls touch driver circuit 130 based on the received control synchronization signals Vsync and Tsync. Touch controller 150 sends and receives touch sensing signals based on interface IF defined with touch driver circuit 130.

[0052] Figure 2 This is a diagram illustrating a touch driving circuit 130 for self-capacitance-based touch sensing and a touch panel TSP in a touch sensing display device according to an embodiment of the present invention.

[0053] The touch sensing display device according to embodiments of the present invention can sense touch input from fingers and / or pens using capacitive touch sensing technology.

[0054] Therefore, such as Figure 2As shown, multiple touch electrodes TE are disposed on the touch panel TSP. Touch driving signals can be applied to each of the multiple touch electrodes TE, and touch sensing signals can be sensed therein. Each of the multiple touch electrodes TE can be electrically connected to the touch driving circuit 130 via a signal line SL. Figure 2 The shape of a touch electrode TE shown is just an example and can be designed in various ways.

[0055] The size of the region forming a touch electrode TE can be larger than the size of the region forming a sub-pixel. For example, the size of the region forming a touch electrode TE can correspond to the size of several to dozens of sub-pixel regions. However, this disclosure is not limited thereto. For example, the size of the region forming a touch electrode TE can be equal to or even smaller than the size of the region forming a sub-pixel.

[0056] At the same time, such as Figure 2 As shown, the touch driving circuit 130 includes one or more first circuits ROIC for providing touch driving signals to the touch panel TSP and detecting (receiving) touch sensing signals from the touch panel TSP, and a second circuit TCR for detecting the presence and / or location of touch input using the result of detecting the touch sensing signals by the first circuits ROIC.

[0057] One or more first circuit ROICs included in the touch driver circuit 130 can be implemented by integrating them together with one or more source driver integrated circuits SDICs that implement the data driver circuit 120 into one or more unified integrated circuits (touch driver circuit SRICs).

[0058] Figure 3 This is an example diagram illustrating the timing of the display driving period DP and the touch driving period TP of a touch sensing display device according to an embodiment of the present invention. Figure 4 This is an example diagram illustrating 16 display driving periods DP1 to DP16 and 16 touch driving periods TP1 to TP16 obtained by dividing a frame of time in a touch sensing display device according to an embodiment of the present invention.

[0059] Reference Figure 3 According to an embodiment of the present invention, the touch sensing display device performs display driving for image display during a predetermined display driving period DP, and performs touch driving for sensing touch input of fingers and / or pens during a predetermined touch driving period TP.

[0060] The display driving period (DP) and the touch driving period (TP) are separated in time, and the display driving period (DP) and the touch driving period (TP) can alternate.

[0061] As described above, when the display driving period DP and the touch driving period TP alternate while being separated in time, the touch driving period TP can be the blanking period during which the display driving is not performed.

[0062] Touch-sensing display devices can generate a touch synchronization signal Tsync that swings between high and low levels, thereby identifying or controlling the display driving period DP and the touch driving period TP.

[0063] For example, the high-level portion (or low-level portion) of the touch synchronization signal Tsync can correspond to the display driving period DP, and the low-level portion (or high-level portion) of the touch synchronization signal Tsync can correspond to the touch driving period TP.

[0064] Meanwhile, regarding the method of allocating a display driving period DP and a touch driving period TP within a frame cycle, as an example, a frame cycle is divided temporally into a display driving period DP and a touch driving period TP, so that display driving can be performed during a display driving period DP, and touch driving for sensing touch input of fingers and / or pens can be performed during a touch driving period TP corresponding to a blanking period.

[0065] As another example, a frame period can be temporally divided into two or more display drive periods (DP) and two or more touch drive periods (TP). A frame's display drive can be performed during the two or more display drive periods (DP) within a frame. During the two or more touch drive periods (TP) corresponding to blanking periods within a frame, one, two, or more touch drives can be performed to sense touch input from a finger and / or pen across the entire screen area, or touch drives can be performed to sense touch input from a finger and / or pen in a portion of the screen area.

[0066] Meanwhile, when a frame period is divided in time into two or more display driving periods (DP) and two or more touch driving periods (TP), each of the two or more blanking periods corresponding to the two or more touch driving periods (TP) within a frame period is called a "long horizontal blanking (LHB)".

[0067] Here, a touch drive that is executed during two or more LHBs within a frame is called an "LHB drive".

[0068] Reference Figure 4 In terms of time, a frame period can be divided into 16 display driving periods DP1 to DP16 and 16 touch driving periods TP1 to TP16.

[0069] In this case, the 16 touch-driven periods TP1 to TP16 correspond to 16 LHBs (LHB#1 to LHB#16).

[0070] Figure 5 This is an illustration of the input / output signals of a touch drive circuit SRIC 130, a timing controller T-CON 140, and a touch controller 150, according to an embodiment of the present invention, for improving touch noise characteristics when driving moving images in a touch-sensing display device. Figure 6 This is an explanatory diagram of the lookup table for the touch controller 150.

[0071] like Figure 5 As shown, the timing controller T-CON 140 outputs a vertical synchronization signal Vsync, a touch synchronization signal Tsync, and average data to the touch controller 150.

[0072] For reference Figure 4 The touch synchronization signal Tsync can be divided into 16 display driving periods DP1 to DP16 and 16 touch driving periods TP1 to TP16 in time. The display driving period DP and the touch driving period TP alternate.

[0073] The average data value may be the average of the data provided to the data driving circuit 120 during each of the display driving periods DP1 to DP16 preceding each of the touch driving periods TP1 to TP16. However, this disclosure is not limited thereto. For example, the average data value may be the average of the data provided to the data driving circuit 120 during at least one of the display driving periods DP1 to DP16 preceding each of the touch driving periods TP1 to TP16.

[0074] Touch controller 150 stores the charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value, and gain compensation value based on the average data values ​​input from timing controller 140, such as... Figure 6 The lookup table shown.

[0075] When driving a moving image and the touch electrode TE is not touched by a finger and / or pen, the touch output voltage is relatively low when displaying low grayscale image data and relatively high when displaying high grayscale image data.

[0076] Therefore, the charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value, and gain compensation value stored in the lookup table are set so that a relatively high touch output voltage is output when the average data value is low grayscale, and a relatively low touch output voltage is output when the average data value is high grayscale.

[0077] The touch controller 150 receives average data values ​​from the timing controller 140 and reads the charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value, and gain compensation value from the lookup table based on the received average data values.

[0078] Then, the touch controller 150 outputs the read charge elimination voltage (CRV) compensation value to the power controller 160.

[0079] The power controller 160 will output the charge elimination voltage V corresponding to the charge elimination voltage (CRV) compensation value. CR Provided to the touch driver circuit SRIC 130.

[0080] The touch controller 150 provides the read charge cancellation capacitor (CRC) compensation value and gain compensation value to the touch driver circuit SRIC 130.

[0081] The touch driver circuit SRIC 130 is based on the charge elimination voltage V. CR The charge cancellation capacitor (CRC) compensation value and gain compensation value sense the touch from the touch electrode and output the touch output voltage.

[0082] Figure 7 This is a circuit configuration diagram of a touch driving circuit SRIC in a touch sensing display device according to an embodiment of the present invention.

[0083] The touch driver circuit SRIC integrates the touch sensing signal through an amplifier circuit to improve the touch sensitivity of the display panel and eliminate touch sensing noise. To prevent saturation of the amplifier circuit's sensing signal, a charge elimination circuit to eliminate the amplifier circuit's charging voltage is used in conjunction with the touch driver circuit SRIC. The touch driver circuit SRIC may include an op amplifier OP and a charge elimination voltage V. CR The input charge elimination voltage is applied to the input terminal V. CR Connected to the charge elimination voltage input terminal V CR The charge elimination capacitor C between the first input terminal of the OP amplifier and the OP. CR And a feedback capacitor C connected between the first input terminal and the output terminal of the OP amplifier to adjust the amplification gain of the OP amplifier. FB The OP amplifier receives the touch signal from the touch electrode TE through the first input terminal and the reference voltage (ΔV) through the second input terminal. LFD It amplifies the touch signal and outputs the touch detection (sensing) voltage (ΔV). out Here, the charge elimination capacitor C CR It can be a variable capacitor. Charge elimination capacitor C CRThe capacitor is adjusted based on the CRC compensation value output from the touch controller 150. Feedback capacitor C FB It can be a variable capacitor. The feedback capacitor C FB The capacitor is changed according to the gain compensation value output from the touch controller 150.

[0084] Figure 7 The touch driving circuit SRIC is illustrated in the case where the display panel DP is a liquid crystal display panel. Since the touch driving circuit SRIC can be applied to organic light-emitting display panels, etc., this invention is not limited thereto.

[0085] In the touch sensing display device according to the present invention configured as described above, a method for setting (storing) charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value and gain compensation value based on average data values ​​in a lookup table will be described below.

[0086] First, when no touch is generated on the touch electrode TE, the touch detection output voltage ΔV of the touch driver circuit SRIC is... out_NON_TOUCH It is represented by [Equation 1].

[0087] [Equation 1]

[0088] ΔV OUT_NON_TOUCH =ΔV LFD

[0089] Here, ΔV LFD It is the reference voltage provided to the second input terminal of the OP amplifier OP of the touch driver circuit SRIC.

[0090] Furthermore, when a finger touches the touch electrode TE, the touch detection output voltage condition of the touch drive circuit SRIC is as shown in [Equation 2].

[0091] [Equation 2]

[0092] C Finger ΔV LFD =C FB (ΔV OUT_TOUCH -ΔV LFD )+(V CR -ΔV LFD C CR

[0093] Here, C Finger The capacitance ΔV represents the capacitance when a finger contacts the touch electrode. out_TOUCH C represents the output voltage of the touch drive circuit SRIC when a finger touches the screen. CR The charge elimination capacitor C represents the SRIC touch driver circuit. CR The capacitance value, C FBThe feedback capacitor C of the touch driver circuit SRIC FB The capacitance value, and V CR This represents the charge elimination voltage V supplied from the power controller 160 to the touch drive circuit SRIC. CR .

[0094] The output voltage ΔV of the touch driver circuit SRIC when touched by a finger out_TOUCH In this regard, [Equation 2] is transformed into [Equation 3].

[0095] [Equation 3]

[0096]

[0097] As can be seen from [Equation 3], the output voltage ΔV of the touch drive circuit SRIC is... out_TOUCH With the charge elimination capacitor C of the touch drive circuit SRIC CR The capacitance value, the feedback capacitor C of the touch drive circuit SRIC FB The capacitance value and the charge elimination voltage V supplied from the power controller 160 to the touch drive circuit SRIC CR Inversely proportional.

[0098] Therefore, in the lookup table of the touch controller 150, when the average data value is low grayscale, the charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value, and gain compensation value are set to relatively low, while when the average data value is high grayscale, the charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value, and gain compensation value are set to relatively high.

[0099] The following describes a method for driving a touch-sensing display device configured as described above according to the present invention.

[0100] First, the touch controller 150 stores the charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value, and gain compensation value in a lookup table based on the average input data value.

[0101] The charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value, and gain compensation value are set to relatively low when the average data value is low grayscale, and relatively high when the average data value is high grayscale.

[0102] Image data Vdata and timing signals (e.g., vertical synchronization signal Vsync, horizontal synchronization signal Hsync, data enable signal DE, and master clock MCLK) are provided from the host system (not shown) to the timing controller 140.

[0103] The timing controller 140 generates a touch synchronization signal Tsync that divides a frame into 16 display driving periods DP1 to DP16 and 16 touch driving periods TP1 to TP16, wherein the display driving periods DP and touch driving periods TP alternate.

[0104] The timing controller 140 generates the average data value of the data provided to the data driving circuit 120 in each of the display driving periods DP1 to DP16 preceding each of the touch driving periods TP1 to TP16.

[0105] In addition, the timing controller 140 provides the generated touch synchronization signal Tsync, the generated average data value, and the vertical synchronization signal Vsync to the touch controller 150.

[0106] The touch controller 150 receives an average data value synchronized with the touch synchronization signal Tsync from the timing controller 140.

[0107] The touch controller 150 reads the charge elimination capacitor (CRC) compensation value, charge elimination voltage (CRV) compensation value, and gain compensation value received from the lookup table based on the average data values.

[0108] Then, the touch controller 150 outputs the read charge elimination voltage (CRV) compensation value to the power controller 160.

[0109] The power controller 160 will output the charge elimination voltage V corresponding to the CRV compensation value. CR Provided to the touch driver circuit SRIC130.

[0110] The touch controller 150 provides the read charge cancellation capacitor (CRC) compensation value and gain compensation value to the touch driver circuit SRIC 130.

[0111] The touch driver circuit SRIC 130 receives the charge elimination voltage V. CR .

[0112] The touch driver circuit SRIC 130 receives the charge elimination capacitor (CRC) compensation value and changes the variable charge elimination capacitor C according to the received CRC compensation value. CR The capacitor.

[0113] The touch driver circuit SRIC 130 receives the gain compensation value and adjusts the variable feedback capacitor C according to the received gain compensation value. FB The capacitor.

[0114] In addition, the touch driver circuit SRIC 130 is based on the charge elimination voltage V CR Charge elimination capacitor C CRThe altered capacitance and the feedback capacitor C FB The altered capacitance amplifies the touch signal from the touch electrode TE and outputs the touch sensing value (Δ). Vout ).

[0115] Figure 8 This is a graph showing the output voltage of the touch driver circuit SRIC relative to the gray level.

[0116] The X-axis represents the grayscale level of the average data input from the timing controller 140 to the touch controller 150, and the Y-axis represents the code value obtained by converting the analog output voltage of the touch driver circuit SRIC into a digital value.

[0117] exist Figure 8 In this paper, a comparison is made between cases in which the present invention is applied and cases in which the present invention is not applied.

[0118] That is, in conventional technology without the application of the present invention, when displaying low grayscale image data, the touch output voltage of the touch driving circuit SRIC is relatively low, while when displaying high grayscale image data, the touch output voltage is relatively high.

[0119] However, when applying this invention, the touch output voltage of the touch driver circuit SRIC remains constant when displaying low grayscale image data or when displaying high grayscale image data.

[0120] Therefore, touch noise characteristics during motion image driving can be improved.

[0121] The touch display device and its driving method according to the present invention, having the above-described features, have the following effects.

[0122] The present invention changes the capacitance of the charge elimination capacitor, the capacitance of the charge elimination capacitor and the capacitance of the feedback capacitor according to the average value of the data provided to the data line in each display driving period before each touch driving period, and amplifies and outputs the touch sensing signal from each touch electrode.

[0123] Therefore, during motion picture driving, the touch sensing output voltage can remain constant when displaying low grayscale image data or when displaying high grayscale image data.

[0124] Furthermore, since the touch sensing output voltage remains constant during motion image driving as described above, touch noise is reduced during motion image driving, and the window can be moved smoothly when moving the window is needed while driving motion images in a small window.

[0125] It will be apparent to those skilled in the art that various modifications and variations can be made to the invention without departing from its spirit or scope. Therefore, this invention is intended to cover such modifications and variations as long as they fall within the scope of the appended claims and their equivalents.

[0126] Cross-reference to related applications

[0127] This application claims the benefit of Korean Patent Application No. 10-2021-0194603, filed on December 31, 2021, which is incorporated herein by reference as if fully set forth herein.

Claims

1. A touch-sensing display device, the touch-sensing display device comprising: The display panel includes a plurality of touch electrodes and a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines; A timing controller configured to output an average data value and a touch synchronization signal, wherein multiple display driving periods and multiple touch driving periods are alternately divided in time in the touch synchronization signal; A touch controller configured to output a charge elimination capacitor compensation value, a charge elimination voltage compensation value, and a gain compensation value based on the average data value; A power controller configured to output a charge elimination voltage based on the charge elimination voltage compensation value; as well as A touch driving circuit is configured to sense touch signals from each touch electrode based on the charge elimination voltage, the charge elimination capacitor compensation value, and the gain compensation value, and to output touch sensing values. Wherein, the average data value is the average of the data provided to the data line during each display driving period prior to each touch driving period, and The charge elimination capacitor compensation value, the charge elimination voltage compensation value, and the gain compensation value are set to relatively low when the average data value is low grayscale, and set to relatively high when the average data value is high grayscale.

2. The touch sensing display device according to claim 1, wherein, The touch driving circuit includes: An OP amplifier is configured to receive the touch signal from each touch electrode through a first input terminal and a reference voltage through a second input terminal, amplify the touch signal, and output the touch sensing value. A charge-eliminating capacitor, the charge-eliminating capacitor being connected between an input terminal for receiving the charge-eliminating voltage and the first input terminal of the OP amplifier; and A feedback capacitor is connected between the first input terminal and the output terminal of the OP amplifier to adjust the amplification gain of the OP amplifier.

3. The touch sensing display device according to claim 2, wherein, The charge elimination capacitor is a variable capacitor whose capacitance changes according to the charge elimination capacitor compensation value; and The feedback capacitor is a variable capacitor whose capacitance changes according to the gain compensation value.

4. The touch sensing display device according to claim 1, wherein, The touch controller is configured to store the charge elimination capacitor compensation value, the charge elimination voltage compensation value, and the gain compensation value based on the average data values ​​in a lookup table.

5. A driving method for a touch-sensing display device, the driving method comprising the following steps: The lookup table stores the charge elimination capacitor compensation value, charge elimination voltage compensation value, and gain compensation value based on the average data values. Output average data value and touch synchronization signal, wherein multiple display driving periods and multiple touch driving periods are alternately divided in time in the touch synchronization signal; Based on the average data value, output the charge elimination capacitor compensation value, charge elimination voltage compensation value, and gain compensation value; Output the charge elimination voltage based on the charge elimination voltage compensation value; The capacitance of the charge elimination capacitor is changed according to the charge elimination capacitor compensation value; The capacitance of the feedback capacitor is changed according to the gain compensation value; The touch signal from each touch electrode is amplified based on the charge elimination voltage, the altered capacitance of the charge elimination capacitor, and the altered capacitance of the feedback capacitor. as well as Output touch sensing values.

6. The driving method according to claim 5, wherein, The average data value is the average of the data provided to the data line during each display driving period prior to each touch driving period.

7. The driving method according to claim 5, wherein, The charge elimination capacitor compensation value, the charge elimination voltage compensation value, and the gain compensation value are set to relatively low when the average data value is low grayscale, and set to relatively high when the average data value is high grayscale.

8. The driving method according to claim 5, wherein, The touch sensing display device includes an OP amplifier, which is configured to receive the touch signal from each touch electrode through a first input terminal and receive a reference voltage through a second input terminal, amplify the touch signal, and output the touch sensing value. The charge elimination capacitor is connected between the input terminal for receiving the charge elimination voltage and the first input terminal of the OP amplifier; and The feedback capacitor is connected between the first input terminal and the output terminal of the OP amplifier.

9. A touch-sensing display device, the touch-sensing display device comprising: The display panel includes a plurality of touch electrodes and a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines; A timing controller configured to output an average data value and a touch synchronization signal, wherein multiple display driving periods and multiple touch driving periods are alternately divided in time in the touch synchronization signal; A touch controller configured to receive the average data value from the timing controller and output a gain compensation value based on the average data value; as well as A touch driving circuit is configured to receive the gain compensation value from the touch controller, sense touch signals from each touch electrode based on the gain compensation value, and output touch sensing values. The touch driving circuit includes: An operational amplifier, configured to receive the touch signal from each touch electrode via a first input terminal and a reference voltage via a second input terminal, amplify the touch signal, and output the touch sensing value; and A feedback capacitor is connected between the first input terminal and the output terminal of the op amplifier to adjust the amplification gain of the op amplifier. Wherein, the feedback capacitor is a variable capacitor whose capacitance changes according to the gain compensation value, and The gain compensation value is set relatively low when the average data value is low grayscale and relatively high when the average data value is high grayscale.

10. A touch-sensing display device, the touch-sensing display device comprising: The display panel includes a plurality of touch electrodes and a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines; A timing controller configured to output an average data value and a touch synchronization signal, wherein multiple display driving periods and multiple touch driving periods are alternately divided in time in the touch synchronization signal; A touch controller configured to receive the average data value from the timing controller and output a charge elimination capacitor compensation value based on the average data value; as well as A touch driving circuit is configured to receive the charge elimination capacitor compensation value from the touch controller, sense touch signals from each touch electrode based on the charge elimination capacitor compensation value, and output touch sensing values. The touch driving circuit includes: An OP amplifier is configured to receive the touch signal from each touch electrode through a first input terminal and a reference voltage through a second input terminal, amplify the touch signal, and output the touch sensing value. A charge-eliminating capacitor connected between an input terminal for receiving a charge-eliminating voltage and the first input terminal of the OP amplifier; and A feedback capacitor is connected between the first input terminal and the output terminal of the op amplifier to adjust the amplification gain of the op amplifier. Wherein, the charge elimination capacitor is a variable capacitor whose capacitance changes according to the charge elimination capacitor compensation value, and The charge elimination capacitor compensation value is set to a relatively low value when the average data value is low grayscale and a relatively high value when the average data value is high grayscale.

11. A touch-sensing display device, the touch-sensing display device comprising: The display panel includes a plurality of touch electrodes and a plurality of sub-pixels defined by a plurality of data lines and a plurality of gate lines; A timing controller configured to output an average data value and a touch synchronization signal, wherein multiple display driving periods and multiple touch driving periods are alternately divided in time in the touch synchronization signal; A touch controller configured to receive the average data value from the timing controller and output a charge elimination voltage compensation value based on the average data value; A power controller configured to receive the charge elimination voltage compensation value from the touch controller and output a charge elimination voltage according to the charge elimination voltage compensation value; as well as A touch driving circuit is configured to receive the charge elimination voltage from the power controller, sense touch signals from each touch electrode based on the charge elimination voltage, and output touch sensing values. The touch driving circuit includes: An OP amplifier is configured to receive the touch signal from each touch electrode through a first input terminal and a reference voltage through a second input terminal, amplify the touch signal, and output the touch sensing value. A charge-eliminating capacitor connected between an input terminal for receiving a charge-eliminating voltage and the first input terminal of the OP amplifier; and A feedback capacitor is connected between the first input terminal and the output terminal of the op amplifier to adjust the amplification gain of the op amplifier. The charge elimination voltage compensation value is set to a relatively low value when the average data value is low grayscale and a relatively high value when the average data value is high grayscale.

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