In-cell touch display device

Abstract

Provided herein is an in-cell touch display device characterized by improving touch sensitivity and accuracy of touch recognition. The in-cell touch display device may include: a display panel including: a transistor forming layer having a driving transistor; a light emitting element layer including a light emitting element on the transistor forming layer; and a plurality of touch electrodes in the transistor forming layer or the light emitting element, the plurality of touch electrodes being driven in a time division manner in a display period and a touch period; the touch driving circuit is used for providing touch driving voltage for the touch electrodes; and a power supply modulation circuit including a first RLC circuit and a second RLC circuit, each including a resistor, an inductor, and a capacitor connected to a respective one of a high potential power supply line supplying the driving transistor and a low potential power supply line supplying the cathode electrode.

Description

Technical Field

[0001] The present disclosure relates to an in-cell touch display device. Background Art

[0002] As the information society develops, various display devices for displaying images are being developed. In addition, touch technology that uses a touch-based input method is being developed to allow users to easily, intuitively, and conveniently input information or instructions to display devices.

[0003] As mentioned above, to apply touch-based input methods to display devices, a touch panel including a touch sensor is separately manufactured and bonded to the display panel. This approach has the disadvantages of increasing the size or thickness of the device and complicating the manufacturing process. Therefore, in-cell touch sensor technology is being developed, in which the touch sensor is built into the display panel, rather than manufacturing a separate touch panel. Summary of the Invention

[0004] Designing and manufacturing a display panel with a built-in touch sensor is a technically challenging undertaking. Furthermore, when a touch sensor comprising multiple touch electrodes is built into a display panel, the touch sensor is positioned very close to the display drive electrodes or display drive lines within the display panel. This significantly increases the likelihood of an increase in parasitic capacitance between the touch sensor and the display drive electrodes, or between the touch sensor and the display drive lines. This increase in parasitic capacitance can lead to a decrease in touch sensitivity.

[0005] In particular, when a touch sensor is built into an organic light emitting diode display panel that emits light by itself, parasitic capacitance is further increased due to structural characteristics of the organic light emitting diode display panel.

[0006] Therefore, the present application aims to provide an in-cell touch display device that can improve touch sensitivity and touch recognition accuracy even when in-cell touch sensor technology is applied to an organic light emitting diode display panel.

[0007] The objects of the embodiments of the present application are not limited to the above objects, and those skilled in the art will clearly understand other objects not mentioned from the following description.

[0008] According to one or more embodiments of the present disclosure, an in-cell touch display device may include: a display panel, the display panel including: a transistor formation layer including a driving transistor having a semiconductor, a source electrode, a drain electrode, and a gate electrode; a light-emitting element layer on the transistor formation layer, the light-emitting element layer including a light-emitting element having an anode electrode, a light-emitting layer, and a cathode electrode; and a plurality of touch electrodes in the transistor formation layer or the light-emitting element, wherein the plurality of touch electrodes are driven in a time-division manner in a display period and a touch period; a touch driving circuit configured to provide pre-set control to the touch electrodes among the plurality of touch electrodes. a touch driving voltage of a fixed period and a predetermined amplitude; and a power modulation circuit, the power modulation circuit including a first RLC circuit and a second RLC circuit, the first RLC circuit including a first resistor, a first inductor and a first capacitor connected to a high-potential power line that provides a high-potential power voltage to the driving transistor, at least the first resistor and the first inductor are connected in parallel; the second RLC circuit including a second resistor, a second inductor and a second capacitor connected to a low-potential power line that provides a low-potential power voltage lower than the high-potential power voltage to the cathode electrode, at least the second resistor and the second inductor are connected in parallel.

[0009] According to one or more other embodiments of the present disclosure, an in-cell touch display device may include: a display panel, the display panel including: a transistor formation layer including a driving transistor having a semiconductor, a source electrode, a drain electrode, and a gate electrode; a light-emitting element layer on the transistor formation layer, the light-emitting element layer including a light-emitting element having an anode electrode, a light-emitting layer, and a cathode electrode; and a plurality of touch electrodes in the transistor formation layer or the light-emitting element, wherein the plurality of touch electrodes are driven in a time-division manner in a display period and a touch period; a touch driving circuit configured to provide a touch driving voltage of a predetermined period and a predetermined amplitude to the touch electrodes among the plurality of touch electrodes; a first RLC circuit including a first resistor, a first inductor, and a first capacitor connected to a high-potential power line that provides a high-potential power voltage to the driving transistor, at least the first resistor and the first inductor being connected in parallel, the first RLC circuit modulating the high-potential power voltage to a voltage having a predetermined amplitude. , a high-potential modulation voltage of a first resonant frequency of the first inductor and the first capacitor, and the first RLC circuit provides the high-potential modulation voltage to the display panel; a second RLC circuit, the second RLC circuit including a second resistor, a second inductor, and a second capacitor connected to a low-potential power line that provides a low-potential power voltage lower than the high-potential power voltage to the cathode electrode, at least the second resistor and the second inductor are connected in parallel, the second RLC circuit modulates the low-potential power voltage into a low-potential modulation voltage having a second resonant frequency of the second resistor, the second inductor, and the second capacitor, and the second RLC circuit provides the low-potential modulation voltage to the display panel; and an adding circuit, the adding circuit being configured to: output a modulated display voltage to a display driving circuit by adding a display voltage to the low-potential modulation voltage, and output a modulated touch voltage to the touch driving circuit by adding the touch driving voltage to the low-potential modulation voltage.

[0010] According to one or more further embodiments of the present disclosure, an embedded touch display device may include: a display panel, the display panel including a plurality of sub-pixels and a plurality of touch electrodes, and the display panel being driven in a time-division manner in a display period and a touch period; a source driver circuit, the source driver circuit being configured to provide a data voltage corresponding to image data to the display panel during the display period; a gate driver circuit being configured to provide a scan pulse to the display panel during the display period, the scan pulse being synchronized with the data voltage; a touch drive circuit, the touch drive circuit being configured to provide a touch drive voltage of a predetermined period and a predetermined amplitude to a touch electrode among the plurality of touch electrodes and to sense a change in capacitance of the touch electrode; and a power supply. A modulation circuit, wherein the power modulation circuit is configured to: modulate a high-potential power supply voltage into a high-potential modulation voltage having the same period and amplitude as the touch drive voltage, modulate a low-potential power supply voltage lower than the high-potential power supply voltage into a low-potential modulation voltage having the same period and amplitude as the touch drive voltage, provide the high-potential modulation voltage and the low-potential modulation voltage to the multiple sub-pixels during the touch period, provide a modulated display voltage having the same period and amplitude as the touch drive voltage to the gate driver circuit and the source driver circuit based on the high-potential modulation voltage and the low-potential modulation voltage, and provide a modulated touch voltage having the same period and amplitude as the touch drive voltage to the touch drive circuit.

[0011] According to one or more further embodiments of the present disclosure, an in-cell touch display device may include: a display panel including: a transistor formation layer including a drive transistor; a light-emitting element layer including a light-emitting element connected to the drive transistor and emitting light during a display period of the in-cell touch display device; a touch electrode in the transistor formation layer or the light-emitting element layer; a touch drive circuit configured to provide a touch drive voltage to the touch electrode and sense a change in capacitance of the touch electrode during a touch period of the touch display device, wherein the touch period does not overlap with the display period; and a power modulation circuit including a first RLC circuit having a first resonant frequency and a second RLC circuit having a second resonant frequency different from the first resonant frequency, wherein the first RLC circuit modulates a high-potential power supply voltage into a high-potential modulation voltage of the first resonant frequency during the touch period and outputs the high-potential modulation voltage to the drive transistor, and the second RLC circuit modulates a low-potential power supply voltage, which is lower than the high-potential power supply voltage, into a low-potential modulation voltage of the second resonant frequency during the touch period and outputs the low-potential modulation voltage to the light-emitting element. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 An in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0013] Figure 2 A timing diagram of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0014] Figure 3 The touch sensor structure in the in-cell touch display device according to one or more embodiments of the present disclosure is schematically shown.

[0015] Figure 4 A cross-sectional view of a display panel in an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0016] Figure 5 A cross-sectional view of a display panel in an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0017] Figure 6A and Figure 6B A sensing circuit and a touch driving state of the touch driving circuit according to the first embodiment of the present disclosure are shown.

[0018] Figure 7A and Figure 7B A sensing circuit and a touch driving state of a touch driving circuit according to a second embodiment of the present disclosure are shown.

[0019] Figure 8A and Figure 8B An equivalent circuit and a touch driving state of a touch driving circuit according to a second embodiment of the present disclosure are shown.

[0020] Figure 9A and Figure 9B A parallel RLC circuit according to one or more embodiments of the present disclosure and a circuit diagram according to τ and ω are shown. d The voltage characteristics of the value.

[0021] Figure 10A and Figure 10B Shown are a parallel RLC circuit to which a modulation voltage is applied and voltage characteristics according to the application of the modulation voltage according to one or more embodiments of the present disclosure.

[0022] Figure 11 A power modulation circuit applied to an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0023] Figure 12A reference voltage generating circuit applied to a power modulation circuit of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0024] Figure 13 An in-cell touch display device according to one or more other embodiments of the present disclosure is shown.

[0025] Figure 14 Shown is one or more embodiments according to the present disclosure Figure 13 Adder.

[0026] Figure 15 A timing diagram of an in-cell touch display device according to one or more other embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0027] Refer to the following and attached Figure 1 The advantages and features of the present application and the methods for achieving these advantages and features will become clear from the detailed description of the embodiments below. However, the present application is not limited to the embodiments disclosed below, but can be implemented in various forms. These embodiments are provided only to make the disclosure of the present application complete and to fully inform those skilled in the art of the present application of the scope of the present application. The present application is limited only by the scope of the appended claims.

[0028] The shapes, sizes, ratios, angles, quantities, etc. disclosed in the drawings for describing the embodiments of the present application are exemplary, and the present application is not limited to the contents shown. The same reference numerals refer to the same components throughout the text. In addition, when describing the present application, when it is determined that the detailed description of the relevant known technology may unnecessarily obscure the subject matter of the present application, its detailed description will be omitted. When the terms "including", "having", "consisting of..." etc. are used in the present application, other parts may be added unless "only" is used. When a component is represented in the singular, it includes the case where the component is set as a plurality of components, unless otherwise expressly stated.

[0029] In explaining components, even if not specifically described separately, the components are understood to include a margin of error.

[0030] When describing a temporal relationship, for example, when using the terms "after," "subsequently," "then," "before," etc., it may include discontinuous cases unless the terms "immediately" or "directly" are used.

[0031] When describing a signal flow relationship, for example, when “a signal is transmitted from node A to node B,” the case where the signal is transmitted from node A to node B via another node may be included unless the term “immediately” or “directly” is used.

[0032] Although terms such as first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, within the technical spirit of the present application, the first component described below may be the second component.

[0033] The features of each embodiment of the present application may be combined or combined in part or in whole, and various technical interactions and drives are possible. These embodiments may be implemented independently of each other or together in an associated relationship.

[0034] Hereinafter, an in-cell touch display device capable of improving touch sensitivity and touch recognition accuracy according to some embodiments will be described.

[0035] Figure 1 An in-cell touch display device according to one or more embodiments of the present disclosure is shown. Figure 2 A timing diagram of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0036] Reference Figure 1 and Figure 2 The embedded touch display device may include a display panel 100, a power supply circuit 200, a power modulation circuit 400, a source driver SDIC (e.g., a source driver circuit), a gate driver GDIC (e.g., a gate driver circuit), a touch drive circuit ROIC, a controller 300, etc.

[0037] The display panel 100 may include a plurality of sub-pixels SP and a plurality of touch electrodes TE, and may be driven in a time-division manner in a display period Td and a touch period Tt. The plurality of touch electrodes TE may be built into the pixel array to detect a touch input.

[0038] During the display period Td, a data voltage corresponding to an image signal may be written on the pixel array of the display panel 100 , and during the touch period Tt of the touch sensor, the touch electrode TE of the display panel 100 may be driven to detect a touch input.

[0039] The power supply circuit 200 may include a first power supply circuit 210 and a second power supply circuit 220 .

[0040] The first power supply circuit 210 can generate a high potential power supply voltage V based on the input power supply VIN and the ground power supply GND. dd and the low potential power supply voltage V ss , and the high potential power supply voltage V dd and the low potential power supply voltage V ss The first RLC circuit R mod1、L mod1 、C mod1 and the second RLC circuit R mod2 、L mod2 、C mod2 .

[0041] The second power supply circuit 220 can generate a high potential power supply voltage V for modulation based on the input power supply VIN and the ground power supply GND. dd and the low potential power supply voltage V ss The first modulation control voltage V mod1 and the second modulation control voltage V mod2 , and the first modulation control voltage V mod1 and the second modulation control voltage V mod2 The first capacitor C of the first RLC circuit is respectively provided mod1 One end of the second capacitor C of the second RLC circuit mod2 one end.

[0042] During the display period, the second power supply circuit 220 can be powered by the high potential power supply voltage V dd The level provides a first modulation control voltage V mod1 , and with a low potential power supply voltage V ss The level provides the second modulation control voltage V mod2 .

[0043] In addition, during the touch period, the second power supply circuit 220 may be powered at a voltage relative to the high potential power supply voltage V dd The level of the first modulation control voltage V has a predetermined period and amplitude. mod1 , and with respect to the low potential power supply voltage V ss The level of the second modulation control voltage V has a predetermined period and amplitude. mod2 .

[0044] In addition, during the display period, the second power circuit 220 may generate a high potential gate driving voltage V based on the input power VIN and the ground power GND. gh and low potential gate drive voltage V gl , and the high potential gate drive voltage V gh and low potential gate drive voltage V gl Provided to the gate driver GDIC.

[0045] In addition, during the display period, the second power circuit 220 may increase the gamma voltage V gamma Provided to the source driver SDIC.

[0046] In addition, during the touch period, the second power circuit 220 can provide the high potential gate driving voltage V gh Modulated to the high potential gate drive voltage V gh The level with a predetermined period and amplitude is the low potential gate drive voltage V gl Modulated to the low potential gate drive voltage V gl The gate driver GDIC is provided with a level having a predetermined period and amplitude, and the modulated high potential gate driving voltage and the low potential gate driving voltage are provided.

[0047] In addition, during the touch period, the second power supply circuit 220 may supply a touch driving voltage V having a predetermined period and amplitude. touch Provided to a touch driving circuit ROIC for sensing a change in capacitance of the touch electrode TE.

[0048] In addition, the second power circuit 220 can generate the gamma voltage V gamma Modulated relative to the gamma voltage V gamma The modulated gamma voltage has a level with a predetermined period and amplitude, and is supplied to the source driver SDIC.

[0049] The power modulation circuit 400 may include: a resistor, an inductor, and a capacitor connected in parallel to provide a high potential power voltage V to the display panel 100; dd The first RLC circuit R of the high potential power line PL1 mod1 、L mod1 、C mod1 and wherein the resistor, inductor and capacitor are connected in parallel to provide a low potential power supply voltage V to the display panel 100 ss The second RLC circuit R of the low potential power line PL2 mod2 、L mod2 、C mod2 .

[0050] During the touch period, the power modulation circuit 400 can adjust the high potential power voltage V dd and the low potential power supply voltage V ss Modulated to a high potential modulation voltage V with the resonant frequency of the resistor, inductor and capacitor dd_mod and low potential modulation voltage V ss_mod , and the high potential modulation voltage V dd_mod and low potential modulation voltage V ss_mod A plurality of sub-pixels SP are provided to the display panel 100 .

[0051] During the touch period, the first RLC circuit R mod1 、L mod1 、C mod1 Through the first capacitor Cmod1 One end receives a first modulation control voltage V having a predetermined period and amplitude mod1 During the touch period, the second RLC circuit R mod2 、L mod2 、C mod2 The second capacitor C mod2 One end receives a second modulation control voltage V having a predetermined period and amplitude mod2 .

[0052] Here, during the display period, the high potential power supply voltage V dd Apply the first modulation control voltage V mod1 and can be powered by a low potential power supply voltage V ss The second modulation control voltage V mod2 .

[0053] In addition, during the touch period, the high potential power supply voltage V dd A first modulation control voltage V is applied at a level having a predetermined period and amplitude mod1 , and during the touch period, the voltage can be adjusted relative to the low potential power supply voltage V ss A second modulation control voltage V is applied at a level having a predetermined period and amplitude mod2 .

[0054] The first RLC circuit R mod1 、L mod1 、C mod1 May include: a first resistor R mod1 , the first resistor R mod1 One end is connected to the high potential power supply voltage V dd The output terminal of the first inductor L is connected to the driving transistor DT of the sub-pixel SP at the other end; mod1 , the first inductor L mod1 One end is connected to the high potential power supply voltage V dd The output terminal of the first capacitor C and the other end of the first capacitor C are connected to the driving transistor DT of the sub-pixel SP; mod1 , the first capacitor C mod1 One end is connected to the first modulation control voltage V mod1 The output terminal of the transistor DT is connected to the output terminal of the sub-pixel SP and the other end is connected to the driving transistor DT of the sub-pixel SP.

[0055] The second RLC circuit R mod2 、L mod2 、C mod2 May include: a second resistor R mod2 , the second resistor R mod2 One end is connected to the low potential power supply voltage V ssThe output end of the second inductor L is connected to the light emitting element OLED of the sub-pixel SP at the other end; mod2 , the second inductor L mod2 One end is connected to the low potential power supply voltage V ss The output terminal and the other end of the capacitor is connected to the light emitting element OLED of the sub-pixel SP; and the second capacitor C mod2 , the second capacitor C mod2 One end is connected to the second modulation control voltage V mod2 The output end of the OLED and the other end of the OLED are connected to the light emitting element OLED of the sub-pixel SP.

[0056] The power modulation circuit 400 may further include a first distribution resistor R1, one end of the first distribution resistor R1 being connected to the first power line PL1 and the other end being connected to the reference voltage V ref and a second distributing resistor R2, one end of the second distributing resistor R2 is connected to the second power line PL2 and the other end is connected to the reference voltage V ref output terminal.

[0057] The node between the first distribution resistor R1 and the second distribution resistor R2 is the reference voltage V ref The output terminal, and the reference voltage V ref The output terminal of the touch driving circuit ROIC can be connected to the input terminal of the touch driving circuit ROIC for sensing the capacitance change of the touch electrode TE.

[0058] Here, during the touch period, the reference voltage V ref can be modulated to have a mod1 、L mod1 、C mod1 and the second RLC circuit R mod2 、L mod2 、C mod2 Modulated high potential modulation voltage V dd_mod and low potential modulation voltage V ss_mod levels of the same period and amplitude.

[0059] The source driver SDIC can use the gamma voltage V gamma The input image data is modulated into corresponding data voltages, and the data voltages are supplied to the source electrodes of the scan transistors T1 of the sub-pixels SP through the data lines of the display panel 100 .

[0060] The gate driver GDIC can use a high potential gate drive voltage V gh and low potential gate drive voltage V glA scan signal is generated and supplied to the gate electrode of the scan transistor T1 of the sub-pixel SP through the gate line of the display panel 100 .

[0061] The touch drive circuit ROIC can use the touch drive voltage V touch Generates a high potential modulation voltage V dd_mod and low potential modulation voltage V ss_mod The touch driving signals have the same period and amplitude, and the touch driving signals are provided to the plurality of touch electrodes TE of the display panel 100 .

[0062] In addition, the touch driving circuit ROIC can detect the capacitance change of the touch electrode TE and modulate the detection voltage into detection data DA as a digital signal. _sen , and the detection data DA _sen Provided to the controller 300.

[0063] The controller 300 may control operation timings of the second power supply circuit 220 , the gate driver GDIC, the source driver SDIC, and the touch driving circuit ROIC using the touch control signal TCS.

[0064] Figure 6A and Figure 6B A sensing circuit and a touch driving state of the touch driving circuit according to the first embodiment of the present disclosure are shown.

[0065] In the case of an in-cell touch technology in which the touch electrode TE is directly designed on the backplane of the thin film transistor of the organic light emitting diode display panel, the distance between the touch electrode TE and the display electrode DE is relatively reduced, so that the parasitic capacitance between the two electrodes is greatly increased.

[0066] In the case of an add-on type, the distance between the touch electrode TE and the display electrode DE is proportional to the thickness of the substrate of the touch electrode TE and has a value of about 500 μm. On the other hand, in the case of an in-cell touch type, the distance between the touch electrode and the display electrode is greatly reduced to a level of about 100 μm, thereby increasing the parasitic capacitor C. p parasitic capacitance and degrades touch performance.

[0067] Here, the display electrodes DE may be defined as electrodes or lines in the display panel 100 for display driving.

[0068] Figure 3 The touch sensor structure of an in-cell touch display device according to an embodiment of the present disclosure is schematically shown.

[0069] Reference Figure 3, the touch sensor of the display panel 100 may include a cathode electrode CE, a touch electrode TE, and a touch line TL.

[0070] The cathode electrode CE may be formed on the entire surface of the display area of the display panel 100 .

[0071] A plurality of touch electrodes TE may be disposed in a grid form in a sub-pixel region corresponding to each sub-pixel in the display area.

[0072] The touch line TL may be electrically connected to each touch electrode TE, and a signal of each touch electrode TE may be transmitted to an external sensing circuit through the touch line TL.

[0073] Figure 4 A cross-sectional view of a display panel in an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0074] Reference Figure 4 , the display panel 110 may include a substrate SUB; a transistor forming layer TRL on which a thin film transistor TFT and a touch electrode TE are formed; light emitting element layers AE, EL, CE; and a cover layer CL.

[0075] The touch electrodes TE may be formed on the substrate SUB at predetermined intervals.

[0076] A buffer layer 111 may be formed on the substrate SUB and the touch electrode TE. The buffer layer 111 may be made of an insulating material.

[0077] A semiconductor 112 of a thin film transistor TFT may be formed on the buffer layer 111 .

[0078] A gate insulating layer 113 may be formed on the semiconductor 112 and the buffer layer 111 .

[0079] The gate electrode 114 may be formed on the gate insulating layer 113 at a position overlapping with the semiconductor 112 .

[0080] An interlayer insulating layer 115 may be formed on the gate electrode 114 and the gate insulating layer 113 .

[0081] A source electrode 116 and a drain electrode 117 may be formed on the interlayer insulating layer 115. The source electrode 116 and the drain electrode 117 may be electrically connected to the semiconductor 112 through contact holes.

[0082] In addition, the touch line TL may be formed on the interlayer insulating layer 115. The touch line TL may be electrically connected to the touch electrode TE through a contact hole.

[0083] A first planarization layer 118 may be formed on the source electrode 116 , the drain electrode 117 , the touch line TL, and the interlayer insulating layer 115 .

[0084] The second planarization layer 119 may be formed on the first planarization layer 118 .

[0085] An anode electrode AE of the organic light emitting diode may be formed on the second planarization layer 119. The anode electrode AE may be electrically connected to the drain electrode 117 of the thin film transistor TFT through a pixel contact hole.

[0086] In addition, a bank layer 120 may be formed on a portion of the second planarization layer 119 and a portion of the anode electrode AE. The bank layer 120 may be made of an opaque material to prevent light interference between pixels adjacent to each other.

[0087] The light emitting layer EL may be formed on the anode electrode AE and may be made of an organic light emitting material.

[0088] A cathode electrode CE may be formed on the light emitting layer EL.

[0089] A cover layer CL may be formed on the cathode electrode CE. The cover layer CL may be made of a transparent material.

[0090] During the touch period, a touch driving signal having a predetermined period and amplitude may be applied to the touch electrode TE, and a low potential modulation voltage V having the same period and amplitude as the touch driving signal may be applied to the touch electrode TE. ss_mod May be applied to the cathode electrode CE.

[0091] More specifically, the touch electrodes TE can be formed when manufacturing a thin film transistor backplane (TFT backplane). For example, the touch electrodes TE can be formed first using a transparent electrode, and then the thin film transistor TFT process can be performed. Here, the thin film transistor backplane can be defined as a layer including a substrate SUB and a transistor formation layer TRL.

[0092] In addition, when forming the source electrode 118 and the drain electrode 117, a touch line TL may be formed on the same layer as the source electrode 118 and the drain electrode 117 and connected to the touch electrode TE. The touch electrode TE may form a coupling capacitor with the cathode electrode CE. A coupling capacitor may be formed between the touch electrode TE and the cathode electrode CE, thereby enabling touch detection regardless of the touch position.

[0093] Because the resistance of the driving thin film transistor becomes very large when representing a low grayscale, the anode electrode AE between the touch electrode TE and the cathode electrode CE may be considered as a floating electrode, and thus the capacitance value of the coupling capacitor may remain unchanged.

[0094] Furthermore, when expressing high grayscale, the capacitor between the cathode electrode CE and the anode electrode AE and the gate-source capacitor of the driving thin film transistor form a series capacitor due to the low resistance of the driving thin film transistor. Therefore, the anode electrode AE between the touch electrode TE and the cathode electrode CE has a very small effect on the coupling capacitor. Therefore, touch detection is possible.

[0095] The in-cell touch display device may be driven in a display period and a touch period in a time-division manner, and a touch driving signal during the touch period may have a predetermined period and amplitude.

[0096] For example, during the touch period, the high potential power supply voltage V dd and the low potential power supply voltage V ss It can be modulated into a high potential modulation voltage V with the same period and amplitude as the touch driving voltage dd_mod and low potential modulation voltage V ss_mod .

[0097] In addition, the voltage V can be modulated based on the high potential dd_mod and low potential modulation voltage V ss_mod The display voltage (eg, gamma voltage, gate high potential voltage, and gate low potential voltage) is modulated to a voltage having the same period and amplitude as the touch driving voltage.

[0098] In addition, the voltage V can be modulated based on the high potential dd_mod and low potential modulation voltage V ss_mod Set the reference voltage V ref Modulates a voltage having the same period and amplitude as the touch drive voltage.

[0099] As described above, the touch electrode TE and the thin film transistor TFT can be formed on the substrate SUB, and the light emitting element layers AE, EL, and CE can be deposited on the touch electrode TE and the thin film transistor TFT. When the object FIN touches, the touch signal can be transmitted through the object capacitor C f and the coupling capacitor to the touch line TL.

[0100] In this case, since the touch signal passes through the object capacitor C f The original signal is differentiated twice by the coupling capacitor. In the embedded touch display device according to the present disclosure, the sensing circuit for detecting the touch signal has two integrators built in and detects the touch signal by integrating the touch signal twice. Here, the sensing circuit is a read-out circuit and may be included in the touch drive circuit ROIC (see FIG. Figure 1 )middle.

[0101] Figure 5A cross-sectional view of a display panel in an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0102] Reference Figure 5 The display panel 100 of the in-cell touch display device according to an embodiment may include a substrate SUB; a transistor formation layer TRL having a thin film transistor TFT formed therein; a light emitting element layer EEL; and a cover layer CL.

[0103] The transistor formation layer TRL may be formed on the substrate SUB, and the touch line TL connected to the cathode electrode CE of the light emitting element layer EEL may be formed in the transistor formation layer TRL.

[0104] The light-emitting element layer (EEL) may be formed on the transistor formation layer (TRL). The light-emitting element layer (EEL) may include an anode electrode (AE), a light-emitting layer (EL), and a cathode electrode (CE). The anode electrode (AE) may be formed on the transistor formation layer (TRL) at predetermined intervals. The light-emitting layer (EL) may be formed between the anode electrode (AE) and the cathode electrode (CE). The light-emitting layer (EL) may be made of an organic light-emitting material. The cathode electrode (CE) may be formed on the light-emitting layer (EL).

[0105] The cover layer CL may be formed on the light emitting element layer EEL. The cover layer CL may be made of a transparent material. When a touch object touches the cover layer CL, a capacitor C may be formed between the touch object and the cathode electrode. f .

[0106] The transistor formation layer TRL will be described in more detail below.

[0107] A buffer layer 111 may be formed on the substrate SUB. The buffer layer 111 may be made of an insulating material. A semiconductor 112 of a thin film transistor TFT may be formed on the buffer layer 111.

[0108] The gate insulating layer 113 may be formed on the semiconductor 112 and the buffer layer 111. The gate electrode 114 may be formed on the gate insulating layer 113 at a position overlapping the semiconductor 112.

[0109] An interlayer insulating layer 115 may be formed on the gate electrode 114 and the gate insulating layer 113. A source electrode 116 and a drain electrode 117 may be formed on the interlayer insulating layer 115. The source electrode 116 and the drain electrode 117 may be electrically connected to the semiconductor 112 through a contact hole.

[0110] A first planarization layer 118 may be formed on the source electrode 116, the drain electrode 117, and the interlayer insulating layer 115. A second planarization layer 119 may be formed on the first planarization layer 118.

[0111] The touch line TL may be formed on the second planarization layer 119. The second planarization layer 119 may include an organic insulating material.

[0112] The touch line TL may be formed in the transistor formation layer TRL at a position that does not overlap with the semiconductor 112 , the source electrode 116 , the drain electrode 117 , and the gate electrode 114 .

[0113] The light emitting element layer EEL will be described in more detail below.

[0114] The anode electrode AE of the light emitting element layer EEL may be formed on the second planarization layer 119. The anode electrode AE may be electrically connected to the drain electrode 117 of the thin film transistor TFT through the pixel contact hole.

[0115] The light emitting layer EL of the light emitting element layer EEL may be formed of an organic material on the anode electrode AE.

[0116] The cathode electrode CE of the light emitting element layer EEL may be formed on the light emitting layer EL.

[0117] In addition, the bank layer 120 may be formed on a portion of the second planarization layer 119 and a portion of the anode electrode AE. The bank layer 120 may be made of an opaque material to prevent light interference between adjacent pixels. For example, the bank layer 120 may include an opaque organic material.

[0118] In addition, a touch contact hole may be formed in the bank layer 120, the light emitting layer EL, and the anode electrode AE overlapping the touch line TL. The touch line TL may be electrically connected to the cathode electrode CE through the touch contact hole. Figure 5 The touch contact hole is shown as passing through the anode electrode AE and the light-emitting layer EL, but this is exemplary and the position of the touch contact hole is not limited thereto. For example, a touch contact hole may be formed through the bank layer 120 in a portion where at least one of the anode electrode AE and the light-emitting layer EL is not provided, and the cathode electrode CE and the touch line TL may be electrically connected through the touch contact hole.

[0119] During the touch period, a low potential modulation voltage V with a predetermined period and amplitude is applied. ss_mod It may be applied to at least one of the cathode electrode CE and the touch line TL.

[0120] like Figure 6A and Figure 6B As shown in the figure, when the reference voltage V is modulated ref When sensing the charge of the touch electrode TE, the charge accumulated in the feedback capacitor C of the operational amplifier AMP is fb The amount of charge in can be changed to (C p +C fb )*V ref Here, the feedback capacitor C fb It can be connected between the input and output of the operational amplifier AMP.

[0121] In this case, due to the accumulation of the feedback capacitor C fb The amount of charge in the capacitor is limited, so as the parasitic capacitor C p The parasitic capacitance increases and can accumulate on the feedback capacitor C fb The amount of charge in the touch screen becomes relatively small, thereby deteriorating the touch performance.

[0122] As described above, when an in-cell touch is designed in an organic light-emitting diode display panel, the parasitic capacitance of the touch electrode TE becomes very large, thereby degrading touch performance. Furthermore, because the very large parasitic capacitance must be filled, the consumed power increases. Furthermore, the driving voltage of the touch electrode may distort the display signal through the coupling capacitor with the adjacent display electrode, thereby degrading image quality. Furthermore, when the display and touch are driven simultaneously, the display electrode DE and the touch electrode affect each other due to the parasitic capacitance, thereby degrading both image quality and touch performance.

[0123] The present disclosure provides an in-cell touch display device capable of improving touch sensitivity and touch recognition accuracy even when an in-cell touch sensor technology is applied to an organic light emitting diode display panel.

[0124] Figure 7A and Figure 7B A sensing circuit and a touch driving state of a touch driving circuit according to a second embodiment of the present disclosure are shown.

[0125] Reference Figure 7A and Figure 7B When a driving voltage with the same period and amplitude is applied to the touch electrode TE and the display electrode DE, the parasitic capacitor C p There is no voltage difference between the electrodes, so the parasitic capacitor C p The amount of charge in the battery does not change.

[0126] On the other hand, the finger capacitor C between the finger FIN and the touch electrode TE f In the case of , since one side is grounded GND and the other side is applied with driving voltage, the capacitor C f The amount of charge in the capacitor is proportional to the driving voltage.

[0127] Figure 8A and Figure 8B An equivalent circuit and a touch driving state of a touch driving circuit according to a second embodiment of the present disclosure are shown.

[0128] Reference Figure 8A and Figure 8B , since voltage is relative, refer to Figure 7A and Figure 7BThe driving described can be considered equivalent to the touch electrode TE, the display electrode DE and the reference voltage V ref In the case where the input end is DC, only the pulsed driving voltage is applied to the ground electrode of the finger FIN.

[0129] The amount of charge sensed at this time can be determined by the driving voltage generated by the finger FIN and the finger capacitor C f The product of the capacitances.

[0130] Therefore, when the touch electrode TE, the display electrode DE and the reference voltage V are driven by the driving signal having the same period and amplitude as described above, ref When the input terminal is connected, only the current stored in the finger capacitor C f The amount of charge in the parasitic capacitor C p The parasitic capacitance of the touch panel is irrelevant, thereby improving the touch performance.

[0131] Return to reference Figure 1 and Figure 2 According to an embodiment of the present disclosure, the in-cell touch display device can generate a modulation voltage having the same period and amplitude in the display electrodes and the touch electrodes.

[0132] The organic light emitting diode display panel may have a high potential power supply voltage V that provides current, gate voltage (or scan pulse), data voltage, etc. dd and the low potential power supply voltage V ss .

[0133] The power supply circuit 200 can generate a high potential power supply voltage V based on an input power supply VIN and a ground power supply GND. dd and the low potential power supply voltage V ss , and the high potential power supply voltage V dd and the low potential power supply voltage V ss are respectively provided to the first RLC circuit R mod1 、L mod1 、C mod1 and the second RLC circuit R mod2 、L mod2 、C mod2 .

[0134] In addition, the power supply circuit 200 can generate a high potential power supply voltage V for modulation based on the input power supply VIN and the ground power supply GND. dd and the low potential power supply voltage V ss The first modulation control voltage V mod1 and the second modulation control voltage V mod2 , and the first modulation control voltage V mod1 and the second modulation control voltage V mod2The first capacitor C of the first RLC circuit is respectively provided mod1 One end of the second capacitor C of the second RLC circuit mod2 one end.

[0135] In addition, during the display period, the power supply circuit 200 can drive the high potential gate voltage V gh and low potential gate drive voltage V gl Provided to the gate driver GDIC, and the gamma voltage V gamma Provided to the source driver SDIC.

[0136] In addition, during the touch period, the power circuit 200 can drive the high potential gate voltage V gh and low potential gate drive voltage V gl modulated to a level with a predetermined period and amplitude, and the modulated high potential gate drive voltage V gh and low potential gate drive voltage V gl Provided to the gate driver GDIC.

[0137] In addition, during the touch period, the power supply circuit 200 may provide a touch driving voltage V having a predetermined period and amplitude. touch Provided to the touch driving circuit ROIC. In addition, the power supply circuit 200 can gamma The gamma voltage is modulated to a level having a predetermined period and amplitude, and the modulated gamma voltage is provided to the source driver SDIC.

[0138] The power modulation circuit 400 may use a first RLC circuit R mod1 、L mod1 、C mod1 and the second RLC circuit R mod2 、L mod2 、C mod2 The high potential power supply voltage V output from the power supply circuit 200 dd and the low potential power supply voltage V ss Modulate to high potential modulation voltage V dd_mod and low potential modulation voltage V ss_mod .

[0139] During the touch period, the power modulation circuit 400 can adjust the high potential power voltage V dd and the low potential power supply voltage V ss Modulated to have the same voltage as the touch driving voltage V touch The high potential modulation voltage V with the same period and amplitude dd_mod and low potential modulation voltage V ss_mod , and the modulated high potential modulation voltage V dd_mod and low potential modulation voltage V ss_modProvided to multiple sub-pixels.

[0140] In addition, the power modulation circuit 400 can modulate the voltage V based on the high potential dd_mod and low potential modulation voltage V ss_mod will have a touch drive voltage V touch The modulated display voltage of the same period and amplitude is provided to the gate driver GDIC and the source driver SDIC.

[0141] In addition, the power modulation circuit 400 can modulate the voltage V based on the high potential dd_mod and low potential modulation voltage V ss_mod will have a touch drive voltage V touch The modulated reference voltage with the same period and amplitude is provided to the touch driving circuit ROIC.

[0142] Figure 9A and Figure 9B A parallel RLC circuit according to one or more embodiments of the present disclosure and a circuit diagram according to τ and ω are shown. d The voltage characteristics of the value. Figure 10A and Figure 10B Shown are a parallel RLC circuit to which a modulation control voltage is applied and voltage characteristics according to the application of the modulation control voltage according to one or more embodiments of the present disclosure.

[0143] Reference Figure 9A and Figure 9B , when the switch of the parallel RLC circuit is turned on, the voltage applied to the circuit is as shown in Equation 1.

[0144] [Formula 1]

[0145] V=V0exp(-t / τ)sin( oh d t )

[0146] ( ω d 2 =ω0 2 -σ 2 ,τ=RC)

[0147] in this case, Figure 9B ] shows the voltage characteristics according to the values of τ = 1 and ωd = 50 kHz.

[0148] Under the above conditions, if Figure 10A and Figure 10B As shown in FIG, when the first capacitor C of the first RLC circuit is supplied with mod1 One end of the second capacitor C of the second RLC circuit mod2When five modulation control voltage pulses with a predetermined period and amplitude are applied to one end of the MOSFET, a high potential modulation voltage V having the same period and amplitude as the modulation control voltage pulses can be obtained. dd_mod and low potential modulation voltage V ss_mod Waveforms like this. When τ is large and ω d When it is small, it can be seen that the applied modulation control voltage V mod By loading the high potential power supply voltage V dd Upper output.

[0149] Figure 11 A power modulation circuit applied to an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0150] Reference Figure 11 , with a resistor of the same value R mod1 and R mod2 、Inductor L mod1 and L mod2 , capacitor C mod1 and C mod2 Design high potential power supply voltage V dd and the low potential power supply voltage V ss , and when a modulation control voltage with the same value V is applied mod1 and V mod2 When , the voltage difference between node A and node B can always remain constant.

[0151] That is, the high potential power supply voltage V dd and the low potential power supply voltage V ss The current applied to the load terminal of the display panel 100 and flowing therethrough can be kept constant and adjusted to the modulation control voltage V mod1 and V mod2 Not relevant.

[0152] In addition, when the high potential power supply voltage V dd and the low potential power supply voltage V ss Generate and apply modulation control voltage V mod1 and V mod2 When the high potential modulation voltage V dd_mod and low potential modulation voltage V ss_mod harmonic component.

[0153] Figure 12 A reference voltage generating circuit applied to a power modulation circuit of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0154] Reference Figure 1and Figure 12 The power supply modulation circuit 400 may include a reference voltage generating circuit. The power supply modulation circuit 400 may include: a first distribution resistor R1, one end of the first distribution resistor R1 is connected to the first power line PL1 and the other end is connected to the reference voltage V ref and a second distributing resistor R2, one end of the second distributing resistor R2 is connected to the second power line PL2 and the other end is connected to the reference voltage V ref output terminal.

[0155] During the touch period, the first RLC circuit R mod1 、L mod1 、C mod1 and the second RLC circuit R mod2 、L mod2 、C mod2 Modulated high potential modulation voltage V dd_mod and low potential modulation voltage V ss_mod Set the reference voltage V ref Modulation is with a high potential modulation voltage V dd_mod and low potential modulation voltage V ss_mod levels of the same period and amplitude.

[0156] Figure 13 An in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0157] Reference Figure 13 , an in-cell touch display device according to one or more embodiments of the present disclosure may include a display panel 100 and a power modulation circuit 400 .

[0158] The display panel 100 may include a plurality of sub-pixels SP and a plurality of touch electrodes TE, and the display panel 100 may be driven in a display period Td and a touch period Tt in a time-division manner according to a touch control signal TCS.

[0159] The power modulation circuit 400 may include: a first RLC circuit R mod1 、L mod1 、C mod1 ; Second RLC circuit R mod2 、L mod2 、C mod2 ; and adding circuits A1, A2, A3.

[0160] The first RLC circuit R mod1 、L mod1 、C mod1 A first resistor R connected in parallel to the first power line PL1 may be included mod1 , the first inductor L mod1 and the first capacitor Cmod1 Here, the high potential power supply voltage V dd The output terminal of the power supply unit 1 can be connected to the first power line PL1.

[0161] Here, the first resistor R mod1 One end can be connected to a high potential power supply voltage V dd The first inductor L has an output terminal and the other terminal is connected to the driving transistor DT of the sub-pixel SP. mod1 One end can be connected to a high potential power supply voltage V dd The output terminal of the first capacitor C and the other end of the first capacitor C are connected to the driving transistor DT of the sub-pixel SP. mod1 One end can be connected to the first modulation control voltage V mod1 The output terminal of the transistor DT is connected to the output terminal of the sub-pixel SP and the other end is connected to the driving transistor DT of the sub-pixel SP.

[0162] During the touch period, the first RLC circuit R mod1 、L mod1 、C mod1 Through the first capacitor C mod1 One end receives a first modulation control voltage V having a predetermined period and amplitude mod1 During the touch period, the first RLC circuit R mod1 、L mod1 、C mod1 The first modulation control voltage V mod1 The high potential power supply voltage V dd Modulate to high potential modulation voltage V dd_mod , and the high potential modulation voltage V is transmitted through the first power line PL1 dd_mod A driving transistor DT is provided to the sub-pixel SP.

[0163] The second RLC circuit R mod2 、L mod2 、C mod2 A second resistor R connected in parallel to the second power line PL2 may be included mod2 , the second inductor L mod2 and the second capacitor C mod2 Here, the low potential power supply voltage V ss The output terminal of the power supply line PL2 can be connected to the second power line PL2.

[0164] Here, the second resistor R mod2 One end can be connected to the low potential power supply voltage V ss The second inductor L has an output terminal and the other terminal is connected to the light emitting element OLED of the sub-pixel SP. mod2 One end can be connected to the low potential power supply voltage V ssThe output terminal of the second capacitor C is connected to the light emitting element OLED of the sub-pixel SP at the other end. mod2 One end can be connected to the second modulation control voltage V mod2 The output end of the OLED and the other end of the OLED are connected to the light emitting element OLED of the sub-pixel SP.

[0165] During the touch period, the second RLC circuit R mod2 、L mod2 、C mod2 The second capacitor C mod2 One end receives a second modulation control voltage V having a predetermined period and amplitude mod2 During the touch period, the second RLC circuit R mod2 、L mod2 、C mod2 The second modulation control voltage V mod2 The low potential power supply voltage V ss Modulate to low potential modulation voltage V ss_mod , and the low potential modulation voltage V is transmitted through the second power line PL2 ss_mod A light emitting element OLED is provided to the sub-pixel SP.

[0166] When the high potential modulation voltage V dd_mod and low potential modulation voltage V ss_mod When resonating at the resonant frequency of RLC, an analog adder can be used to add the display voltage and touch voltage to the low-potential modulation voltage V ss_mod The voltages are added and output as a modulated display voltage and a modulated touch voltage.

[0167] Adding circuits A1, A2, and A3 can display the voltage V gh 、V gl or V gamma With low potential modulation voltage V ss_mod Add to get the modulated display voltage V gh_mod 、V gl_mod or V gamma_mod , and modulate the display voltage V gh_mod 、V gl_mod or V gamma_mod Provided to display driver circuits GDIC and SDIC.

[0168] In addition, the adding circuits A1, A2, and A3 can touch or V ref With low potential modulation voltage V ss_mod Add to get the modulated touch voltage V touch_mod or V ref_mod , and modulate the touch voltage V touch_mod or V ref_modProvided to the touch drive circuit ROIC.

[0169] The adding circuits A1 , A2 , A3 may include a first adder A1 , a second adder A2 , and a third adder A3 .

[0170] The first adder A1 can be used to convert the high potential gate drive voltage V gh and low potential gate drive voltage V gl and the low potential modulation voltage V ss_mod Add to obtain the modulated high potential gate drive voltage V gh_mod and modulated low potential gate drive voltage V gl_mod , and modulate the high potential gate drive voltage V gh_mod and modulated low potential gate drive voltage V gl_mod Provided to the gate driver GDIC.

[0171] The second adder A2 can be used to generate the gamma voltage V gamma With low potential modulation voltage V ss_mod Add to obtain the modulated gamma voltage V gamma_mod , and modulate the gamma voltage V gamma_mod Provided to the source driver SDIC.

[0172] The third adder A3 can be configured to generate a touch driving voltage V touch Or reference voltage V ref With low potential modulation voltage V ss_mod Add to obtain the modulated touch drive voltage V touch_mod Or modulated reference voltage V ref_mod , and modulate the touch drive voltage V touch_mod Or modulated reference voltage V ref_mod Provided to the touch drive circuit ROIC.

[0173] The in-cell touch display device according to another embodiment of the present disclosure may further include a power supply circuit 200 . The power supply circuit 200 may include a first power supply circuit 210 and a second power supply circuit 220 .

[0174] The first power supply circuit 210 can generate a high potential power supply voltage V based on the input power supply VIN and the ground power supply GND. dd and the low potential power supply voltage V ss , and the high potential power supply voltage V dd and the low potential power supply voltage V ss are provided to the first RLC circuit and the second RLC circuit respectively.

[0175] The second power supply circuit 220 can generate a high potential power supply voltage V for modulation based on the input power supply VIN and the ground power supply GND. dd and the low potential power supply voltage V ss The first modulation control voltage V mod1 and the second modulation control voltage V mod2 , and the first modulation control voltage V mod1 and the second modulation control voltage V mod2 are respectively provided to one end of the first capacitor of the first RLC circuit and one end of the second capacitor of the second RLC circuit.

[0176] In addition, the second power supply circuit 220 can generate a high potential gate driving voltage V based on the input power supply VIN and the ground power supply GND. gh and low potential gate drive voltage V gl , and the high potential gate drive voltage V gh and low potential gate drive voltage V gl Provided to the first adder A1 of the adding circuit.

[0177] In addition, the second power circuit 220 can generate a gamma voltage V based on the input power VIN and the ground power GND. gamma , and the gamma voltage V gamma Provided to the second adder A2 of the adding circuit.

[0178] In addition, the second power circuit 220 can generate a touch driving voltage V based on the input power VIN and the ground power GND. touch and reference voltage V ref , and the touch drive voltage V touch and reference voltage V ref Provided to the third adder A3 of the adding circuit.

[0179] Figure 14 One or more other embodiments according to the present disclosure are shown. Figure 13 Adder. Figure 15 A timing diagram of an in-cell touch display device according to one or more other embodiments of the present disclosure is shown.

[0180] Reference Figure 14 The adder includes an operational amplifier 410, and an input resistor R connected in parallel to the non-inverting input terminal (+) in and source resistor R s .

[0181] Input resistor R in One end can be applied with a low potential modulation voltage V ss_mod , and the source resistor Rs One end can be applied with input voltage V dis Here, the input voltage V dis is the display voltage, which can be a high potential gate drive voltage V gh , low potential gate drive voltage V gl Or gamma voltage V gamma Alternatively, the input voltage V dis is the touch voltage, which can be the touch drive voltage V touch Or reference voltage V ref .

[0182] exist Figure 15 The output of the analog adder under the voltage conditions shown in is shown in Equation 2 below.

[0183] [Formula 2]

[0184]

[0185] When the input resistor R in and source resistor R s When the values are the same, the output voltage can be expressed as V out =V ss_mod +V dis That is, at low power supply voltage V ss is 0V and the low potential modulation voltage V ss_mod In the case of a sine wave centered at 0V, when the reference voltage V ref is 5V and the reference voltage V ref and low potential modulation voltage V ss_mod When input to the adder, Figure 15 As shown in FIG, it can be seen that the output voltage has a sine wave centered at 5V, and the reference voltage V ref The touch segment is modulated.

[0186] According to the embodiments of the present disclosure, when the in-cell touch sensor technology is applied to a display panel, the generation of parasitic capacitance between the touch electrodes and the display electrodes can be prevented or at least reduced, thereby improving touch sensitivity and touch recognition accuracy.

[0187] Furthermore, it is possible to reduce the thickness of the display panel, implement a curved surface, and improve degradation of image quality due to crosstalk with a touch voltage.

[0188] Furthermore, by improving touch sensitivity, an uplink signal can be easily generated, thereby enabling active pen touch.

[0189] Furthermore, since the frequency and damping constant can be adjusted by the resistance value, this can be achieved even with a small inductor.

[0190] Furthermore, process optimization can be achieved by reducing touch costs and production energy.

[0191] In addition, since there is no need to fill the large parasitic capacitance between the touch electrode and the display electrode, power consumption can be reduced, thereby achieving low power consumption.

[0192] According to one aspect of the present disclosure, an in-cell touch display device may include: a display panel, the display panel including: a transistor formation layer including a semiconductor, a source electrode, a drain electrode, and a gate electrode of a driving transistor; a light-emitting element layer provided on the transistor formation layer and including an anode electrode, a light-emitting layer, and a cathode electrode of a light-emitting element; and a plurality of touch electrodes provided on the transistor formation layer or the light-emitting element, the plurality of touch electrodes being driven in a time-division manner in a display period and a touch period; a touch driving circuit providing a touch driving voltage having a predetermined period and amplitude to the touch electrodes; and a power modulation circuit including: a first RLC circuit and a second RLC circuit in which a resistor, an inductor, and a capacitor are connected in parallel to each of a high-potential power line providing a high-potential power voltage to the driving transistor and a low-potential power line providing a low-potential power voltage to the cathode electrode.

[0193] According to one or more embodiments of the present disclosure, during the touch period, the power modulation circuit may modulate the high-potential power supply voltage and the low-potential power supply voltage into a high-potential modulation voltage and a low-potential modulation voltage having a resonant frequency of the resistor, the inductor, and the capacitor, and provide the high-potential modulation voltage and the low-potential modulation voltage to the high-potential power line and the low-potential power line, respectively.

[0194] According to one or more embodiments of the present disclosure, during the touch period, a first modulation control voltage and a second modulation control voltage having a predetermined period and amplitude may be applied to one end of the first capacitor of the first RLC circuit and one end of the second capacitor of the second RLC circuit, respectively.

[0195] According to one or more embodiments of the present disclosure, during the display period, the first modulation control voltage may be applied at the level of the high potential power supply voltage, and the second modulation control voltage may be applied at the level of the low potential power supply voltage, and during the touch period, the first modulation control voltage may be applied at a level having a predetermined period and amplitude relative to the level of the high potential power supply voltage, and the second modulation control voltage may be applied at a level having a predetermined period and amplitude relative to the level of the low potential power supply voltage.

[0196] According to one or more embodiments of the present disclosure, the first RLC circuit may include: a first resistor, one end of which is connected to the output end of the high-potential power supply voltage and the other end is connected to the driving transistor; a first inductor, one end of which is connected to the output end of the high-potential power supply voltage and the other end is connected to the driving transistor; and a first capacitor, one end of which is connected to the output end of the first modulation control voltage and the other end is connected to the driving transistor.

[0197] According to one or more embodiments of the present disclosure, the second RLC circuit may include: a second resistor, one end of which is connected to the output end of the low-potential power supply voltage and the other end is connected to the light-emitting element; a second inductor, one end of which is connected to the output end of the low-potential power supply voltage and the other end is connected to the light-emitting element; and a second capacitor, one end of which is connected to the output end of the second modulation control voltage and the other end is connected to the light-emitting element.

[0198] According to one or more embodiments of the present disclosure, the embedded touch display device may further include: a first distribution resistor, one end of which is connected to the first power line and the other end is connected to the output end of the reference voltage; and a second distribution resistor, one end of which is connected to the second power line and the other end is connected to the output end of the reference voltage.

[0199] According to one or more embodiments of the present disclosure, the output terminal of the reference voltage may be connected to an input terminal of a reference voltage of the touch driving circuit for sensing a change in capacitance of the touch electrode.

[0200] According to one or more embodiments of the present disclosure, during the touch period, the reference voltage may be modulated to a level having the same period and amplitude as the high potential modulation voltage and the low potential modulation voltage modulated by the first and second RLC circuits.

[0201] According to one or more embodiments of the present disclosure, the embedded touch display device may further include: a first power supply circuit, which generates the high-potential power supply voltage and the low-potential power supply voltage based on the input power supply and the ground power supply, and provides the high-potential power supply voltage and the low-potential power supply voltage to the first RLC circuit and the second RLC circuit; and a second power supply circuit, which generates a first modulation control voltage and a second modulation control voltage for modulating the high-potential power supply voltage and the low-potential power supply voltage based on the input power supply and the ground power supply, and provides the first modulation control voltage and the second modulation control voltage to one end of the first capacitor of the first RLC circuit and one end of the second capacitor of the second RLC circuit.

[0202] According to one or more embodiments of the present disclosure, the second power supply circuit may provide the first modulation control voltage at the level of the high potential power supply voltage during the display period, and provide the second modulation control voltage at the level of the low potential power supply voltage; during the touch period, the first modulation control voltage may be provided at a level having a predetermined period and amplitude relative to the level of the high potential power supply voltage, and the second modulation control voltage may be provided at a level having a predetermined period and amplitude relative to the level of the low potential power supply voltage.

[0203] According to one or more embodiments of the present disclosure, the second power supply circuit may generate a high-potential gate drive voltage and a low-potential gate drive voltage based on the input power supply and the ground power supply during the display period, and provide the high-potential gate drive voltage and the low-potential gate drive voltage; during the touch period, the high-potential gate drive voltage may be modulated at a level having a predetermined period and amplitude relative to the high-potential gate drive voltage, and the low-potential gate drive voltage may be modulated to a level having a predetermined period and amplitude relative to the low-potential gate drive voltage, so as to provide the modulated high-potential gate drive voltage and the modulated low-potential gate drive voltage to the gate driver; and during the touch period, the touch drive voltage may be provided to the touch drive circuit.

[0204] According to one or more embodiments of the present disclosure, during the touch period, the scan signal output from the gate driver may have the same predetermined cycle and amplitude as the touch driving voltage.

[0205] According to one or more other embodiments of the present disclosure, an in-cell touch display device may include: a display panel, the display panel including: a transistor formation layer including a semiconductor, a source electrode, a drain electrode, and a gate electrode of a driving transistor; a light-emitting element layer provided on the transistor formation layer and including an anode electrode, a light-emitting layer, and a cathode electrode of a light-emitting element; and a plurality of touch electrodes provided on the transistor formation layer or the light-emitting element, the plurality of touch electrodes being driven in a time-division manner during a display period and a touch period; a touch driving circuit providing a touch driving voltage having a predetermined period and amplitude to the touch electrodes; wherein a resistor, an inductor, and a capacitor are connected in parallel to a high-potential power supply line providing a high-potential power supply voltage to the driving transistor and a low-potential power supply line providing a low-potential power supply voltage to the cathode electrode. a first RLC circuit and a second RLC circuit for each of the low-potential power supply lines of the high-potential power supply voltage, the first RLC circuit and the second RLC circuit modulating the high-potential power supply voltage and the low-potential power supply voltage into a high-potential modulation voltage and a low-potential modulation voltage having a resonant frequency of the resistor, the inductor and the capacitor connected in parallel, and providing the high-potential modulation voltage and the low-potential modulation voltage to the display panel; and an adding circuit, the adding circuit obtaining a modulated display voltage by adding the display voltage to the low-potential modulation voltage and providing the modulated display voltage to the display driving circuit, obtaining a modulated touch voltage by adding the touch voltage to the low-potential modulation voltage and providing the modulated touch voltage to the touch driving circuit.

[0206] According to one or more other embodiments of the present disclosure, the adding circuit may further include a first adder, which obtains a modulated high-potential gate drive voltage and a modulated low-potential gate drive voltage by adding the high-potential gate drive voltage and the low-potential gate drive voltage as the display voltage to the low-potential modulation voltage, and provides the modulated high-potential gate drive voltage and the modulated low-potential gate drive voltage to the gate driver of the display drive circuit.

[0207] According to one or more other embodiments of the present disclosure, the adding circuit may further include a second adder, which obtains a modulated gamma voltage by adding the gamma voltage serving as the display voltage to the low-voltage modulation voltage, and provides the modulated gamma voltage to the source driver of the display driving circuit.

[0208] According to one or more other embodiments of the present disclosure, the adding circuit may further include a third adder, which obtains a modulated reference voltage by adding a reference voltage serving as the touch voltage to the low-voltage modulation voltage, and provides the modulated reference voltage to the touch drive circuit.

[0209] According to one or more other embodiments of the present disclosure, the embedded touch display device may further include: a first power supply circuit, which generates the high-potential power supply voltage and the low-potential power supply voltage based on the input power supply and the ground power supply, and provides the high-potential power supply voltage and the low-potential power supply voltage to the first RLC circuit and the second RLC circuit; and a second power supply circuit, which generates a first modulation control voltage and a second modulation control voltage for modulating the high-potential power supply voltage and the low-potential power supply voltage based on the input power supply and the ground power supply, and provides the first modulation control voltage and the second modulation control voltage to one end of the first capacitor of the first RLC circuit and one end of the second capacitor of the second RLC circuit.

[0210] According to one or more other embodiments of the present disclosure, the second power supply circuit may generate a high-potential gate drive voltage and a low-potential gate drive voltage based on the input power supply and the ground power supply, and provide the high-potential gate drive voltage and the low-potential gate drive voltage to the first adder of the adding circuit; generate a gamma voltage based on the input power supply and the ground power supply, and provide the gamma voltage to the second adder of the adding circuit; generate a reference voltage based on the input power supply and the ground power supply, and provide the reference voltage to the third adder of the adding circuit.

[0211] According to one or more other embodiments of the present disclosure, an in-cell touch display device may include: a display panel including: a transistor formation layer including a drive transistor; a light-emitting element layer including a light-emitting element connected to the drive transistor and emitting light during a display period of the in-cell touch display device; a touch electrode in the transistor formation layer or the light-emitting element layer; a touch drive circuit configured to provide a touch drive voltage to the touch electrode and sense a change in capacitance of the touch electrode during a touch period of the touch display device, wherein the touch period does not overlap with the display period; and a power modulation circuit including a first RLC circuit having a first resonant frequency and a second RLC circuit having a second resonant frequency different from the first resonant frequency. The first RLC circuit may modulate a high-potential power supply voltage to a high-potential modulation voltage of the first resonant frequency during the touch period and output the high-potential modulation voltage to the drive transistor, and the second RLC circuit may modulate a low-potential power supply voltage, which is lower than the high-potential power supply voltage, to a low-potential modulation voltage of the second resonant frequency during the touch period and output the low-potential modulation voltage to the light-emitting element.

[0212] According to one or more other embodiments of the present disclosure, the first RLC circuit may include a first resistor, a first inductor and a first capacitor connected to a high-potential power line that outputs the high-potential modulation voltage to the driving transistor, at least the first resistor and the first inductor are connected in parallel, and the second RLC circuit may include a second resistor, a second inductor and a second capacitor connected to a low-potential power line that outputs the low-potential modulation voltage to the light-emitting element, at least the second resistor and the second inductor are connected in parallel.

[0213] According to one or more other embodiments of the present disclosure, a power supply circuit may also be included, which is configured to: generate a first modulation control voltage provided to the first capacitor, and the first RLC circuit modulates the high-potential power supply voltage to the high-potential modulation voltage of the first resonant frequency based on the first modulation control voltage; and generate a second modulation control voltage provided to the second capacitor, and the second RLC circuit modulates the low-potential power supply voltage to the low-potential modulation voltage of the second resonant frequency based on the second modulation control voltage.

[0214] According to one or more other embodiments of the present disclosure, during the display period, the power supply circuit may generate the first modulation control voltage as a first direct current (DC) voltage that is the same as the high potential power supply voltage and the second modulation control voltage as a second DC voltage that is the same as the low potential power supply voltage, and during the touch period, the power supply circuit may generate the first modulation control voltage having a first frequency and a first amplitude and the second modulation control voltage having a second period and a second amplitude.

[0215] According to one or more other embodiments of the present disclosure, the present invention may further include: a display driving circuit that drives the driving transistor; a first adder that generates a modulated display voltage by adding the display voltage to the low-voltage modulation voltage during the touch period and outputs the modulated display voltage to the display driving circuit; and a second adder that generates a modulated touch voltage by adding the touch voltage to the low-voltage modulation voltage during the touch period and outputs the modulated touch voltage to the touch driving circuit.

[0216] According to the embodiments of the present disclosure, when an in-cell touch display panel is applied to a display panel, generation of parasitic capacitance between touch electrodes and display electrodes can be prevented or at least reduced, thereby improving touch sensitivity and touch recognition accuracy.

[0217] Furthermore, it is possible to reduce the thickness of the display panel, implement a curved surface, and improve degradation of image quality due to crosstalk with a touch voltage.

[0218] Furthermore, by improving touch sensitivity, an uplink signal can be easily generated, thereby enabling active pen touch.

[0219] Furthermore, since the frequency and damping constant can be adjusted by the resistance value, this can be achieved even with a small inductor.

[0220] Furthermore, process optimization can be achieved by reducing touch costs and production energy.

[0221] In addition, since there is no need to fill the large parasitic capacitance between the touch electrode and the display electrode, power consumption can be reduced, thereby achieving low power consumption.

[0222] Specific effects together with the above-mentioned effects are described together with the description of the following details for implementing the present disclosure.

[0223] Although the present invention has been described above with reference to the exemplary drawings, the present invention is not limited to the embodiments and drawings disclosed in the specification. It is obvious that those skilled in the art can make various modifications within the scope of the technical spirit of the present invention. In addition, although the operational effects of the configuration according to the present invention are not explicitly described in the description of the embodiments of the present invention, it goes without saying that the effects expected by the corresponding configuration should be recognized.

Claims

1. An embedded touch display device, comprising: A display panel comprising: a transistor formation layer including a driving transistor having a semiconductor, a source electrode, a drain electrode, and a gate electrode; a light-emitting element layer on the transistor formation layer, the light-emitting element layer including a light-emitting element having an anode electrode, a light-emitting layer, and a cathode electrode; and a plurality of touch electrodes in the transistor formation layer or the light-emitting element layer, wherein the plurality of touch electrodes are driven in a time-division manner in a display period and a touch period; a touch driving circuit configured to provide a touch driving voltage of a predetermined period and a predetermined amplitude to touch electrodes among the plurality of touch electrodes; and A power supply modulation circuit, the power supply modulation circuit including a first RLC circuit and a second RLC circuit, the first RLC circuit including a first resistor, a first inductor and a first capacitor connected to a high-potential power supply line that provides a high-potential power supply voltage to the driving transistor, at least the first resistor and the first inductor are connected in parallel; the second RLC circuit including a second resistor, a second inductor and a second capacitor connected to a low-potential power supply line that provides a low-potential power supply voltage lower than the high-potential power supply voltage to the cathode electrode, at least the second resistor and the second inductor are connected in parallel.

2. The in-cell touch display device according to claim 1, wherein: During the touch period, the power modulation circuit modulates the high-potential power voltage into a high-potential modulation voltage having a first resonant frequency of the first resistor, the first inductor, and the first capacitor and outputs the high-potential modulation voltage to the high-potential power line, and The power modulation circuit modulates the low potential power voltage into a low potential modulation voltage having a second resonance frequency of the second resistor, the second inductor, and the second capacitor, and outputs the low potential modulation voltage to the low potential power line.

3. The in-cell touch display device according to claim 1, wherein: During the touch period, the first capacitor of the first RLC circuit is applied with a first modulation control voltage having a first period and a first amplitude, and the second capacitor of the second RLC circuit is applied with a second modulation control voltage having a second period and a second amplitude.

4. The in-cell touch display device according to claim 3, wherein: During the display period, the first modulation control voltage is applied at a level of the high potential power supply voltage, and the second modulation control voltage is applied at a level of the low potential power supply voltage, During the touch period, the first modulation control voltage is applied at a level having the first period and the first amplitude relative to a level of the high potential power supply voltage, and the second modulation control voltage is applied at a level having the second period and the second amplitude relative to a level of the low potential power supply voltage.

5. The in-cell touch display device according to claim 1, wherein: a first end of the first resistor being connected to an output terminal of the high potential power supply voltage and a second end of the first resistor being connected to the driving transistor; a first end of the first inductor connected to the output terminal of the high potential power supply voltage and a second end of the first inductor connected to the driving transistor; A first terminal of the first capacitor is connected to an output terminal of a first modulation control voltage and a second terminal of the first capacitor is connected to the driving transistor.

6. The in-cell touch display device according to claim 5, wherein: a first end of the second resistor being connected to an output terminal of the low-potential power supply voltage and a second end of the second resistor being connected to the cathode electrode; a first end of the second inductor connected to the output terminal of the low potential power supply voltage and a second end of the second inductor connected to the cathode electrode; A first terminal of the second capacitor is connected to an output terminal of a second modulation control voltage and a second terminal of the second capacitor is connected to the cathode electrode.

7. The in-cell touch display device according to claim 1, further comprising: a first distributing resistor having a first end connected to the high-potential power supply line and a second end connected to an output terminal of a reference voltage; and a second distributing resistor having a first end connected to the low potential power supply line and a second end connected to the output terminal of the reference voltage; 8 . The in-cell touch display device according to claim 7 , wherein the output terminal of the reference voltage is connected to the input terminal of the reference voltage of the touch driving circuit, and the touch driving circuit is configured to sense a change in capacitance of the touch electrode.

9. The in-cell touch display device according to claim 8, wherein: During the touch period, the reference voltage is modulated to a level having the same period and the same amplitude as the high potential modulation voltage and the low potential modulation voltage modulated by the first RLC circuit and the second RLC circuit.

10. The in-cell touch display device according to claim 1, further comprising: a first power supply circuit configured to generate the high-potential power supply voltage and the low-potential power supply voltage based on an input power supply and a ground power supply, the first power supply circuit supplying the high-potential power supply voltage and the low-potential power supply voltage to the first RLC circuit and the second RLC circuit; as well as a second power supply circuit configured to generate a first modulation control voltage and a second modulation control voltage for modulating the high potential power supply voltage and the low potential power supply voltage based on the input power supply and the ground power supply, the second power supply circuit providing the first modulation control voltage to the first capacitor of the first RLC circuit, and the second power supply circuit providing the second modulation control voltage to the second capacitor of the second RLC circuit.

11. The in-cell touch display device according to claim 10, wherein the second power supply circuit is further configured as: providing the first modulation control voltage at the level of the high potential power supply voltage during the display period; providing the second modulation control voltage at the level of the low potential power supply voltage during the display period; providing the first modulation control voltage at a first level having a first period and a first amplitude relative to a level of the high-potential power supply voltage during the touch period; and During the touch period, the second modulation control voltage is provided at a second level having a second period and a second amplitude relative to a level of the low-potential power voltage.

12. The in-cell touch display device according to claim 10, wherein the second power supply circuit is further configured as: generating a high potential gate driving voltage and a low potential gate driving voltage lower than the high potential gate driving voltage based on the input power supply and the ground power supply; During the display period, providing the high potential gate driving voltage and the low potential gate driving voltage to a gate driver; During the touch period, modulating the high potential gate drive voltage at a first level having a first period and a first amplitude relative to the high potential gate drive voltage to generate a modulated high potential gate drive voltage; During the touch period, modulating the low-potential gate driving voltage to a second level having a second period and a second amplitude relative to the low-potential gate driving voltage to generate a modulated low-potential gate driving voltage; providing the modulated high potential gate driving voltage and the modulated low potential gate driving voltage to the gate driver during the touch period; and During the touch period, the touch driving voltage is provided to the touch driving circuit. 13 . The in-cell touch display device according to claim 12 , wherein during the touch period, the scan signal output from the gate driver has the same period and the same amplitude as the touch driving voltage.

14. An embedded touch display device, comprising: A display panel comprising: a transistor formation layer including a driving transistor having a semiconductor, a source electrode, a drain electrode, and a gate electrode; a light-emitting element layer on the transistor formation layer, the light-emitting element layer including a light-emitting element having an anode electrode, a light-emitting layer, and a cathode electrode; and a plurality of touch electrodes in the transistor formation layer or the light-emitting element layer, wherein the plurality of touch electrodes are driven in a time-division manner in a display period and a touch period; a touch driving circuit configured to provide a touch driving voltage of a predetermined period and a predetermined amplitude to a touch electrode among the plurality of touch electrodes; a first RLC circuit, the first RLC circuit including a first resistor, a first inductor, and a first capacitor connected to a high-potential power supply line that supplies a high-potential power supply voltage to the driving transistor, at least the first resistor and the first inductor being connected in parallel, the first RLC circuit modulating the high-potential power supply voltage into a high-potential modulation voltage having a first resonant frequency of the first resistor, the first inductor, and the first capacitor, and providing the high-potential modulation voltage to the display panel; a second RLC circuit, the second RLC circuit including a second resistor, a second inductor, and a second capacitor connected to a low-potential power supply line that supplies a low-potential power supply voltage lower than the high-potential power supply voltage to the cathode electrode, at least the second resistor and the second inductor being connected in parallel, the second RLC circuit modulating the low-potential power supply voltage into a low-potential modulation voltage having a second resonant frequency of the second resistor, the second inductor, and the second capacitor, and providing the low-potential modulation voltage to the display panel; and An adding circuit, wherein the adding circuit is configured as follows: By adding the display voltage to the low potential modulation voltage, the modulated display voltage is output to the display driving circuit, and The modulated touch voltage is output to the touch driving circuit by adding the touch driving voltage to the low-potential modulation voltage.

15. The in-cell touch display device according to claim 14, wherein the adding circuit comprises a first adder, and the first adder is configured as follows: generating a modulated high potential gate drive voltage by adding a high potential gate drive voltage to the low potential modulation voltage; generating a modulated low potential gate drive voltage by adding a low potential gate drive voltage to the low potential modulation voltage; and The modulated high potential gate driving voltage and the modulated low potential gate driving voltage are output to a gate driver circuit of the display driving circuit.

16. The in-cell touch display device according to claim 15, wherein the adding circuit further comprises a second adder, and the second adder is configured as follows: The modulated gamma voltage is output to a source driver of the display driving circuit by adding the gamma voltage as the display voltage to the low potential modulation voltage.

17. The in-cell touch display device according to claim 16, wherein the adding circuit further comprises a third adder, and the third adder is configured as follows: A modulated reference voltage is output to the touch driving circuit by adding a reference voltage as the touch voltage to the low potential modulation voltage.

18. The in-cell touch display device according to claim 17, further comprising: a first power supply circuit configured to generate the high-potential power supply voltage and the low-potential power supply voltage based on an input power supply and a ground power supply, the first power supply circuit supplying the high-potential power supply voltage and the low-potential power supply voltage to the first RLC circuit and the second RLC circuit; as well as a second power supply circuit configured to generate a first modulation control voltage and a second modulation control voltage for modulating the high potential power supply voltage and the low potential power supply voltage based on the input power supply and the ground power supply, the second power supply circuit supplying the first modulation control voltage and the second modulation control voltage to the first capacitor of the first RLC circuit and the second capacitor of the second RLC circuit; The second power supply circuit is configured as follows: generating a high potential gate driving voltage and a low potential gate driving voltage based on the input power supply and the ground power supply; providing the high potential gate drive voltage and the low potential gate drive voltage to a first adder of the adding circuit; generating a gamma voltage based on the input power supply and the ground power supply; providing the gamma voltage to a second adder of the adding circuit; generating a reference voltage based on the input power supply and the ground power supply; and The reference voltage is supplied to the third adder of the adding circuit.

19. An embedded touch display device, comprising: a display panel including a plurality of sub-pixels and a plurality of touch electrodes, wherein the display panel is driven in a display period and a touch period in a time-division manner; a source driver circuit configured to provide a data voltage corresponding to image data to the display panel during the display period; a gate driver circuit configured to provide a scan pulse to the display panel during the display period, the scan pulse being synchronized with the data voltage; A touch driving circuit, wherein the touch driving circuit is configured as follows: providing a touch driving voltage of a predetermined period and a predetermined amplitude to a touch electrode among the plurality of touch electrodes, and sensing a change in capacitance of the touch electrode; as well as A power supply modulation circuit, wherein the power supply modulation circuit is configured as follows: modulating the high-potential power supply voltage into a high-potential modulation voltage having the same period and amplitude as the touch driving voltage, modulating a low-potential power supply voltage lower than the high-potential power supply voltage into a low-potential modulation voltage having the same period and the same amplitude as the touch driving voltage, During the touch period, the high potential modulation voltage and the low potential modulation voltage are provided to the plurality of sub-pixels, Based on the high-voltage modulation voltage and the low-voltage modulation voltage, a modulated display voltage having the same period and the same amplitude as the touch drive voltage is provided to the gate driver circuit and the source driver circuit, and a modulated reference voltage having the same period and amplitude as the touch drive voltage is provided to the touch drive circuit.

20. The in-cell touch display device according to claim 19, wherein the power modulation circuit comprises: a first RLC circuit, the first RLC circuit including a first resistor, a first inductor, and a first capacitor connected to a high-potential power supply line, at least the first resistor and the first inductor being connected in parallel, the first RLC circuit modulating the high-potential power supply voltage into the high-potential modulation voltage having a first resonant frequency of the first resistor, the first inductor, and the first capacitor; and a second RLC circuit, the second RLC circuit including a second resistor, a second inductor, and a second capacitor connected to a low-potential power supply line, at least the second resistor and the second inductor being connected in parallel, the second RLC circuit modulating the low-potential power supply voltage into the low-potential modulation voltage having a second resonant frequency of the second resistor, the second inductor, and the second capacitor.

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