In-cell touch display device

Abstract

The present disclosure provides an in-cell touch display device capable of implementing in-cell touch sensor technology in an organic light emitting diode display panel. The in-cell touch display device may include: a substrate; a transistor forming layer formed on the substrate and including a semiconductor, a source electrode, a drain electrode, and a gate electrode; and a light emitting element layer formed on the transistor forming layer and including an anode electrode, a light emitting layer, and a cathode electrode, wherein a plurality of touch electrodes forming coupling capacitors with the cathode electrode of the light emitting element layer may be formed in the transistor forming layer.

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 the in-cell touch sensor technology is applied to an organic light emitting diode display panel that emits light itself, the parasitic capacitance will be further increased due to the structural characteristics of the organic light emitting diode display panel.

[0006] Therefore, the present application aims to provide an embedded touch display device capable of implementing embedded touch sensor technology in 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 aspect of the present disclosure, an embedded touch display device may include: a substrate; a transistor forming layer formed on the substrate and including a semiconductor, a source electrode, a drain electrode and a gate electrode; and a light-emitting element layer formed on the transistor forming layer and including an anode electrode, a light-emitting layer and a cathode electrode, wherein a plurality of touch electrodes may be formed in the transistor forming layer to form a coupling capacitor with the cathode electrode of the light-emitting element layer.

[0009] According to another aspect of the present disclosure, an embedded touch display device may include: a display panel, the display panel including: a plurality of sub-pixels having light-emitting elements and thin film transistors, and a plurality of touch electrodes formed in a transistor formation layer in which the thin film transistors are formed to form coupling capacitors with cathode electrodes of the light-emitting elements, the cathode electrodes being disposed above the plurality of touch electrodes; and a sensing circuit configured to sense a touch signal by integrating a signal output from the touch electrodes once and integrating the integrated signal twice. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 An in-cell touch display device according to an embodiment of the present disclosure is shown.

[0011] Figure 2 A timing diagram of an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0012] Figure 3A and Figure 3B A sensing circuit and a touch driving state of the touch driving circuit according to the first embodiment of the present disclosure are shown.

[0013] Figure 4A and Figure 4B A sensing circuit and a touch driving state of a touch driving circuit according to a second embodiment of the present disclosure are shown.

[0014] Figure 5A and Figure 5B An equivalent circuit and a touch driving state of a touch driving circuit according to a second embodiment of the present disclosure are shown.

[0015] Figure 6A and Figure 6B The parallel RLC circuit and the relationship between τ and ω are shown. d The voltage characteristics of the value.

[0016] Figure 7A and Figure 7B A parallel RLC circuit to which a modulation voltage is applied and voltage characteristics according to the application of the modulation voltage are shown.

[0017] Figure 8 A power modulation circuit applied to an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0018] Figure 9 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.

[0019] Figure 10The touch sensor structure in the in-cell touch display device according to one embodiment of the present disclosure is schematically shown.

[0020] Figure 11 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.

[0021] Figure 12 A sensing circuit in an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0022] Figure 13 The driving state of the in-cell touch display device according to one embodiment of the present disclosure is shown.

[0023] Figure 14 A driving timing diagram of an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0024] Figure 15 A display panel in an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0025] Figure 16 Shown according to one embodiment of the present disclosure Figure 15 Equivalent circuit diagram of the touch unit.

[0026] Figure 17 According to one embodiment of the present disclosure, Figure 15 The touch position and the output value of the touch electrode. 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 an embodiment of the present disclosure is shown. Figure 2 A timing diagram of an in-cell touch display device according to an embodiment 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, a gate driver GDIC, a touch driving circuit ROIC, a controller 300, and the like.

[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, 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 the display panel 100 to which the high potential power voltage V is supplied. 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 the display panel 100 is provided with a low potential power supply voltage V 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 C mod1 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 Apply 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 can be used with respect 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 Vdd 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 ss The 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 Vdd_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 (or data line wirings) 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 gl A 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 3A and Figure 3B 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, the distance between the touch electrode and the display electrode is very small, at 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] like Figure 3A and Figure 3B As shown in the figure, when the reference voltage V is modulated ref When sensing the charge of the touch electrode TE, the charge is accumulated in the feedback capacitor C fb The amount of charge in can be changed to (C p +C f )*V ref .

[0069] 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.

[0070] 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.

[0071] 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.

[0072] Figure 4A and Figure 4B A sensing circuit and a touch driving state of a touch driving circuit according to a second embodiment of the present disclosure are shown.

[0073] Reference Figure 4A and Figure 4BWhen 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.

[0074] 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.

[0075] Figure 5A and Figure 5B An equivalent circuit and a touch driving state of a touch driving circuit according to a second embodiment of the present disclosure are shown.

[0076] Reference Figure 5A and Figure 5B Since the voltage is relative, it can be considered equivalent to the touch electrode TE, display electrode DE and 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 .

[0081] 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 Vss , 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 .

[0082] 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 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] The power modulation circuit 400 may use a first RLC circuit R mod1 、L mod1 、C mod1and 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 .

[0087] 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_mod Provided to multiple sub-pixels.

[0088] 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.

[0089] 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.

[0090] Figure 6A and Figure 6B The parallel RLC circuit and the relationship between τ and ω are shown. d The voltage characteristics of the value. Figure 7A and Figure 7B A parallel RLC circuit to which a modulation control voltage is applied and voltage characteristics according to the application of the modulation control voltage are shown.

[0091] Reference Figure 6A and Figure 6B , when the switch of the parallel RLC circuit is turned on, the voltage applied to the circuit is as shown in Equation 1.

[0092] [Formula 1]

[0093] V=V0exp(-t / τ)sin( oh d t )

[0094] in this case, Figure 6B ] shows the voltage characteristics according to the values of τ = 1 and ωd = 50 kHz.

[0095] Under the above conditions, if Figure 7A and Figure 7B As shown in FIG, when five modulation control voltage pulses are applied at the initial stage, the Figure 7B The waveform shown in . When τ is large and ωd 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.

[0096] Figure 8 A power modulation circuit applied to an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0097] Reference Figure 8 , 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.

[0098] 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.

[0099] 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.

[0100] According to the embodiments of the present disclosure, when the in-cell touch sensor technology is applied to a display panel, parasitic capacitance may be prevented from being generated between touch electrodes and display electrodes, thereby improving touch sensitivity and touch recognition accuracy.

[0101] 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.

[0102] Furthermore, by improving touch sensitivity, an uplink signal can be easily generated, thereby enabling active pen touch.

[0103] Furthermore, since the frequency and damping constant can be adjusted by the resistance value, this can be achieved even with a small inductor.

[0104] An in-cell touch display device according to one aspect of the present disclosure allows implementation of in-cell touch sensor technology in an organic light emitting diode display panel.

[0105] Figure 9 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.

[0106] Reference Figure 9 The display panel 100 of the in-cell touch display device according to one aspect of the present disclosure may include a substrate SUB; a transistor formation layer TRL; light emitting element layers AE, EL, CE; and a cover layer CL.

[0107] The transistor formation layer TRL may be formed on the substrate SUB.

[0108] The transistor formation layer TRL may include a coupling capacitor C formed with the cathode electrode CE of the light emitting element layer. ct The plurality of touch electrodes TE may be formed as transparent electrodes and formed on the substrate SUB at predetermined intervals. Alternatively, the touch electrodes TE may be formed on the same layer as the metal of the transistor formation layer using the same material and the same process.

[0109] The light emitting element layers AE, EL, and CE may be formed on the transistor formation layer TRL.

[0110] The light-emitting element layers AE, EL, and CE 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 a predetermined interval. 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 material. The cathode electrode CE may be formed on the light-emitting layer EL.

[0111] A cover layer CL may be formed on the light emitting element layers AE, EL, and CE. When a touch object FIN touches the cover layer CL, a capacitor C may be formed between the touch object FIN and the cathode electrode. f In this application, the capacitor C between the touch object FIN and the cathode electrode f It is called the object capacitor C f or finger capacitor C f A capacitor C may also be formed between the cathode electrode CE and the touch electrode TE. ct In this application, the capacitor C is formed between the cathode electrode CE and the touch electrode TE. ct It is called coupling capacitor C ct When the finger capacitor C is formed in the display panel 100 f and coupling capacitor C ct When the touch position is anywhere on the display panel, touch detection can be performed.

[0112] Since the resistance of the driving thin film transistor becomes very large when representing low grayscale, the anode electrode AE between the touch electrode TE and the cathode electrode CE can be regarded as a floating electrode, and thus the coupling capacitor C ct The capacitance value can remain unchanged.

[0113] In addition, because 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 small resistance of the driving thin film transistor when expressing high grayscale, the anode electrode AE between the touch electrode TE and the cathode electrode CE is coupled to the capacitor C. ct The impact can be very small.

[0114] Therefore, when an object touches the display panel 100, the finger capacitor C formed in the display panel 100 can be sensed. f and coupling capacitor C ct The change in capacitance is used to detect touch.

[0115] Figure 10 The touch sensor structure of an in-cell touch display device according to an embodiment of the present disclosure is schematically shown.

[0116] Reference Figure 10 , the touch sensor of the display panel 100 may include a touch electrode TE and a touch line TL.

[0117] The cathode electrode CE may be formed on the entire surface of the display area of the display panel 100 .

[0118] A plurality of touch electrodes TE may be arranged in a grid form in the display area.

[0119] 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.

[0120] Figure 11 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.

[0121] Reference Figure 11 , 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.

[0122] The touch electrodes TE may be formed on the substrate SUB at predetermined intervals.

[0123] 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.

[0124] A semiconductor 112 of a thin film transistor TFT may be formed on the buffer layer 111 .

[0125] A gate insulating layer 113 may be formed on the semiconductor 112 and the buffer layer 111 .

[0126] The gate electrode 114 may be formed on the gate insulating layer 113 at a position overlapping with the semiconductor 112 .

[0127] An interlayer insulating layer 115 may be formed on the gate electrode 114 and the gate insulating layer 113 .

[0128] 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.

[0129] 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.

[0130] For example, the touch line TL may be formed on the same layer as the source electrode 116 and the drain electrode 117. Alternatively, the touch line TL may be formed on a layer different from the source electrode 116 and the drain electrode 117 along the same layer as the data line ( Figure 11 The data voltage can be applied to the data line, and the gate line can be scanned by the transistor ( Figure 11 114 is electrically connected to the gate electrode 114 of the driving transistor.

[0131] 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 .

[0132] The second planarization layer 119 may be formed on the first planarization layer 118 .

[0133] In addition, the stacking position of the touch electrode TE is illustrative, and the touch electrode TE is not limited to being disposed between the substrate SUB and the buffer layer 111. For example, the touch electrode TE may be disposed on the same layer as the gate electrode 114 or on the same layer as the source electrode 116 and the drain electrode 117. Alternatively, the touch electrode TE may be disposed between the first planarization layer 118 and the second planarization layer 119.

[0134] 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.

[0135] 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.

[0136] The light emitting layer EL may be formed on the anode electrode AE and may be made of an organic light emitting material.

[0137] A cathode electrode CE may be formed on the light emitting layer EL.

[0138] A cover layer CL may be formed on the cathode electrode CE. The cover layer CL may be made of a transparent material.

[0139] In the in-cell touch display device according to the present disclosure, during a 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 (See Figure 1 ) may be applied to the cathode electrode CE.

[0140] The touch electrode TE can form a coupling capacitor C with the cathode electrode CE. ct A coupling capacitor C may be formed between the touch electrode TE and the cathode electrode CE. ct , so that touch detection can be performed regardless of the touch position.

[0141] Since the resistance of the driving thin film transistor becomes very large when expressing low grayscale, the anode electrode AE between the touch electrode TE and the cathode electrode CE can be regarded as a floating electrode, and thus the coupling capacitor C ct The capacitance value can remain unchanged.

[0142] In addition, because 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 small resistance of the driving thin film transistor when expressing high grayscale, the anode electrode AE between the touch electrode TE and the cathode electrode CE is coupled to the capacitor C. ct Therefore, touch detection is possible.

[0143] 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 has a predetermined period and amplitude.

[0144] 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 and is provided to a plurality of sub-pixels.

[0145] 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.

[0146] 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.

[0147] As mentioned above, refer to Figures 9 to 11 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 coupling capacitor C ct Transmitted to the touch line TL.

[0148] In this case, since the touch signal passes through the object capacitor C f and coupling capacitor C ctThe original signal is differentiated twice. 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.

[0149] Figure 12 A sensing circuit in an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0150] Reference Figure 12 , the sensing circuit 500 senses a touch signal by once integrating a signal output from the touch electrode TE and twice integrating the integrated signal.

[0151] The sensing circuit 500 may include a first integrator 510 for primarily integrating a signal output from the touch electrode TE, and a second integrator 520 for secondarily integrating the signal integrated by the first integrator 510 .

[0152] The first integrator 510 may include a first operational amplifier AMP having a first input terminal for receiving the output signal of the touch electrode TE and a first input terminal to which a reference voltage V is applied. ref and a first feedback capacitor C connected between the output terminal and the first input terminal of the first operational amplifier AMP; fb1 .

[0153] The second integrator 520 may include a second operational amplifier AMP having a third input terminal electrically connected to the output terminal of the first operational amplifier AMP and a reference voltage V applied thereto. ref and a second feedback capacitor C connected between the output terminal and the third input terminal of the second operational amplifier AMP fb2 .

[0154] During the touch period, the touch driving signal applied to the touch electrode TE has a predetermined period and amplitude. The touch driving signal passes through the object capacitor C f and coupling capacitor C ct The sensing circuit 500 may restore the touch driving signal by integrating the signal output from the touch electrode TE twice through the first integrator 510 and the second integrator 520 to restore the touch driving signal.

[0155] Figure 13 The driving state of the in-cell touch display device according to one embodiment of the present disclosure is shown.

[0156] Reference Figure 13 During the touch period, a touch driving signal with a predetermined period and amplitude may be applied to the touch electrode TE. In addition, 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 It can be applied to the cathode electrode CE. In addition, the reference voltage V ref The reference voltage may be applied to the input terminals of the first integrator 510 and the second integrator 520 .

[0157] also, Figure 13 The voltage state of the equivalent circuit during touch is shown. Assuming that the signal is modulated by the potential of the touching finger during touch, the sensing method is as follows.

[0158] First, the modulated signal transmitted through the finger passes through the object capacitor C f Converted into a first differential signal. That is, the modulation signal is input instantaneously and then passes through the resistor R s Output. The primary differential signal passes through the coupling capacitor C ct The signal is transmitted to the first integrator 510, at which time, the signal is secondarily differentiated and input to the first integrator 510. The signal is integrated by the first integrator 510 and converted to the signal passing through the object capacitor C f The output signal is in a similar form to the original modulated signal. The signal is restored to the same form as the original modulated signal by the second integrator 520. Therefore, the final output value of the sensing circuit 500 is proportional to the size of the touch input signal.

[0159] Figure 14 A driving timing diagram of an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0160] Reference Figure 14 , waveform ① shows that, assuming that during the touch period, a touch driving signal with a predetermined period and amplitude is applied to the touch electrode TE, and a low potential modulation voltage V having the same period and amplitude as the touch driving signal is applied to the cathode electrode CE ss_mod When applied to the object capacitor C f The potential of the finger is modulated.

[0161] Waveform ② shows the capacitance C f The first differential signal, waveform ③, shows the first differential signal passing through the coupling capacitor C ct Waveform 4 shows the signal integrated once by first integrator 510. Here, the once-integrated signal is the same as the inverted signal of the once-differentiated signal. Waveform 5 shows the signal integrated twice by second integrator 520. Here, the twice-integrated signal is the same as the signal restored from waveform 1.

[0162] Figure 15 A display panel in an in-cell touch display device according to an embodiment of the present disclosure is shown. Figure 16 Shown according to one embodiment of the present disclosure Figure 15 Equivalent circuit diagram of the touch unit. Figure 17 According to one embodiment of the present disclosure, Figure 15 The touch position and the output value of the touch electrode.

[0163] Through Figure 15 The display panel 100 of the configuration shown in FIG is simulated to check the operating characteristics. First, the pixel unit has a sheet resistor R s With parasitic capacitor C p and is provided with a low potential power supply voltage V ss The thin film resistor R s With the high potential power supply voltage V dd The resistor R ol Here, the resistor R ol Acts as a series resistor between the driver thin film transistor and the light emitting element.

[0164] The touch unit 110 is composed of 5×5 pixel units, and the touch panel 100 is composed of 4×5 touch units 110. A low potential power supply voltage V is supplied through a low potential power supply voltage line outside the touch panel 100. ss . Resistor R ol and parasitic capacitor C p The size of is set to be equal to the value of 20 touch units 110 in the display panel.

[0165] For example, when the sheet resistance is 87Ω / sh, the touch line resistance is 500Ω, and the object capacitor C f is 1pf, and the modulation control voltage V mod The results obtained with a pulse of 10V are shown in Figure 17 The touch position can be obtained by outputting a touch driving signal applied by a pulse of a modulated control voltage from 3 to 4 regions of the touch electrode TE without spreading to the thin-layer resistor of the panel.

[0166] As described above, according to the embodiments of the present disclosure, since the touch electrode is formed in the backplane process of the thin film transistor, a touch function can be implemented in the organic light emitting diode display panel with minimal processes.

[0167] In addition, in order to solve the problem of differentiating the touch signal twice by forming a finger capacitor between the touch object and the cathode electrode and a coupling capacitor between the cathode electrode and the touch electrode by arranging the touch electrode in the transistor formation layer, the touch signal can be detected without error by building two integrators into the sensing circuit.

[0168] In addition, compared with an on-cell touch screen, the thickness of the display panel can be reduced and the size of the frame can be reduced.

[0169] Furthermore, since there is no touch electrode on the organic light emitting diode, transmittance can be improved compared to conventional touch technologies.

[0170] In addition, since the touch electrode is formed in the back panel of the thin film transistor by using a transparent electrode, top emission and bottom emission of the organic light emitting diode can be achieved.

[0171] Furthermore, since the touch electrodes are located in the backplane of the thin film transistor, double-sided touch is possible.

[0172] Furthermore, process optimization can be achieved by reducing touch costs and production energy.

[0173] 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.

[0174] According to one aspect of the present disclosure, an embedded touch display device may include: a substrate; a transistor forming layer formed on the substrate and including a semiconductor, a source electrode, a drain electrode and a gate electrode; and a light-emitting element layer formed on the transistor forming layer and including an anode electrode, a light-emitting layer and a cathode electrode, wherein a plurality of touch electrodes may be formed in the transistor forming layer to form a coupling capacitor with the cathode electrode of the light-emitting element layer.

[0175] According to one aspect of the present disclosure, a cover layer may be further formed on the light emitting element layer, and when a touch object touches the cover layer, an object capacitor may be formed between the touch object and the cathode electrode.

[0176] According to one aspect of the present disclosure, the in-cell touch display device may further include a sensing circuit configured to sense capacitance changes of the object capacitor and the coupling capacitor through the touch electrodes when the touch object touches the cover layer.

[0177] According to one aspect of the present disclosure, the touch electrode may be formed on the substrate in the transistor formation layer.

[0178] According to one aspect of the present disclosure, the touch electrode may be provided on the same layer as the gate electrode or may be provided on the same layer as the source electrode and the drain electrode.

[0179] According to one aspect of the present disclosure, the in-cell touch display device may further include a touch line formed in the transistor formation layer and electrically connected to the touch electrode.

[0180] According to one aspect of the present disclosure, the touch wire may be formed on the same layer as the source electrode and the drain electrode of the transistor formation layer.

[0181] According to one aspect of the present disclosure, the touch line may be formed in a direction parallel to the data line by being formed on a layer different from the source electrode and the drain electrode of the transistor formation layer.

[0182] According to one aspect of the present disclosure, during a touch period, a touch driving signal having a predetermined period and amplitude may be applied to the touch electrode, and a low-potential modulation voltage having the same period and amplitude as the touch driving signal may be applied to the cathode electrode.

[0183] According to one aspect of the present disclosure, the touch electrode may be formed as a transparent electrode.

[0184] According to another aspect of the present disclosure, an embedded touch display device may include: a display panel, the display panel including: a plurality of sub-pixels having light-emitting elements and thin film transistors, and a plurality of touch electrodes formed in a transistor formation layer in which the thin film transistors are formed to form coupling capacitors with cathode electrodes of the light-emitting elements, the cathode electrodes being disposed above the plurality of touch electrodes; and a sensing circuit configured to sense a touch signal by integrating a signal output from the touch electrodes once and integrating the integrated signal twice.

[0185] According to another aspect of the present disclosure, the sensing circuit may include: a first integrator configured to primarily integrate a signal output from the touch electrode; and a second integrator configured to secondarily integrate a signal integrated by the first integrator.

[0186] According to another aspect of the present disclosure, the first integrator may include: a first operational amplifier having a first input terminal configured to receive an output signal of the touch electrode and a second input terminal to which a reference voltage is applied; and a first feedback capacitor connected between the output terminal of the first operational amplifier and the first input terminal.

[0187] According to another aspect of the present disclosure, the second integrator may include: a second operational amplifier having a third input terminal electrically connected to the output terminal of the first operational amplifier and a fourth input terminal to which the reference voltage is applied; and a second feedback capacitor connected between the output terminal of the second operational amplifier and the third input terminal.

[0188] According to another aspect of the present disclosure, during a touch period, a touch drive signal having a predetermined period and amplitude may be applied to the touch electrode, a low-voltage modulation voltage having the same period and amplitude as the touch drive signal may be applied to the cathode electrode, and the reference voltage having the same period and amplitude as the touch drive signal may be applied to the second input terminal of the first operational amplifier and the fourth input terminal of the second operational amplifier.

[0189] According to another aspect of the present disclosure, the display panel may include: a substrate; a transistor forming layer formed on the substrate and including a semiconductor, a source electrode, a drain electrode and a gate electrode; a light-emitting element layer formed on the transistor forming layer and including an anode electrode, a light-emitting layer and the cathode electrode; and a covering layer, wherein the covering layer is formed on the light-emitting element layer and forms an object capacitor between the touch object and the cathode electrode when a touch object touches the covering layer, and the multiple touch electrodes may be formed in the transistor forming layer and may form a coupling capacitor with the cathode electrode of the light-emitting element layer.

[0190] According to another aspect of the present disclosure, a cover layer may be further formed on the light emitting element layer, and when a touch object touches the cover layer, an object capacitor may be formed between the touch object and the cathode electrode.

[0191] According to another aspect of the present disclosure, when the touch object touches the cover layer, the sensing circuit may sense capacitance changes of the object capacitor and the coupling capacitor through two integrators.

[0192] According to another aspect of the present disclosure, when the touch object touches the cover layer, the sensing circuit may sense capacitance changes of the object capacitor and the coupling capacitor through two integrators.

[0193] According to an embodiment of the present disclosure, since the touch electrode is formed in a backplane process of a thin film transistor, a touch function can be implemented in an organic light emitting diode display panel with minimal processes.

[0194] In addition, in order to solve the problem of differentiating the touch signal twice by forming a finger capacitor between the touch object and the cathode electrode and a coupling capacitor between the cathode electrode and the touch electrode by arranging the touch electrode in the transistor formation layer, the touch signal can be detected without error by building two integrators into the sensing circuit.

[0195] In addition, compared with an on-cell touch screen, the thickness of the display panel can be reduced and the size of the frame can be reduced.

[0196] Furthermore, since there is no touch electrode on the organic light emitting diode, transmittance can be improved compared to conventional touch technologies.

[0197] In addition, since the touch electrode is formed in the back panel of the thin film transistor by using a transparent electrode, top emission and bottom emission of the organic light emitting diode can be achieved.

[0198] Furthermore, since the touch electrodes are located in the backplane of the thin film transistor, double-sided touch is possible.

[0199] Furthermore, process optimization can be achieved by reducing touch costs and production energy.

[0200] 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.

[0201] Specific effects together with the above-mentioned effects are described together with the description of the following details for implementing the present disclosure.

[0202] Although the present disclosure has been described above with reference to the exemplary drawings, the present disclosure is not limited to the embodiments and drawings disclosed in the specification, and it is obvious that those skilled in the art can make various modifications within the scope of the technical spirit of the present disclosure. In addition, although the operational effects of the configuration according to the present disclosure are not explicitly described in the description of the embodiments of the present disclosure, it goes without saying that the effects expected by the corresponding configuration should be recognized.

Claims

1. An embedded touch display device, comprising: substrate; a transistor forming layer on the substrate, the transistor forming layer comprising a semiconductor, a source electrode, a drain electrode, and a gate electrode; and a light emitting element layer on the transistor formation layer, the light emitting element layer including an anode electrode, a light emitting layer and a cathode electrode, The transistor formation layer includes a plurality of touch electrodes, and all of the plurality of touch electrodes form coupling capacitors with the cathode electrode of the light emitting element layer.

2. The in-cell touch display device according to claim 1, wherein a cover layer is provided on the light emitting element layer, and When a touch object touches the cover layer, an object capacitor is formed between the touch object and the cathode electrode.

3. The in-cell touch display device according to claim 2 , further comprising a sensing circuit configured to sense capacitance changes of the object capacitor and the coupling capacitor through touch electrodes among the plurality of touch electrodes when the touch object touches the cover layer.

4. The in-cell touch display device according to claim 3, wherein the sensing circuit comprises: a first integrator configured to once integrate a signal output from the touch electrode; and A second integrator is configured to double-integrate the signal integrated by the first integrator.

5. The in-cell touch display device according to claim 4, wherein the first integrator comprises: a first operational amplifier having a first input terminal configured to receive an output signal of the touch electrode and a second input terminal to which a reference voltage is applied; as well as A first feedback capacitor is connected between the output terminal of the first operational amplifier and the first input terminal.

6. The in-cell touch display device according to claim 5, wherein the second integrator comprises: a second operational amplifier having a third input terminal electrically connected to the output terminal of the first operational amplifier and a fourth input terminal to which the reference voltage is applied; as well as A second feedback capacitor is connected between the output terminal of the second operational amplifier and the third input terminal.

7. The embedded touch display device according to claim 6, wherein during a touch period, a touch drive signal having a predetermined period and amplitude is applied to the touch electrode, a low-voltage modulation voltage having the same period and amplitude as the touch drive signal is applied to the cathode electrode, and the reference voltage having the same period and amplitude as the touch drive signal is applied to the second input terminal of the first operational amplifier and the fourth input terminal of the second operational amplifier.

8. The in-cell touch display device according to claim 1, wherein the plurality of touch electrodes are located on the substrate or are provided on the same layer as the gate electrode or are provided on the same layer as the source electrode and the drain electrode in the transistor formation layer, and are formed as transparent electrodes. 9 . The in-cell touch display device according to claim 1 , further comprising a touch line in the transistor formation layer, the touch line being electrically connected to a touch electrode among the plurality of touch electrodes. 10 . The in-cell touch display device according to claim 9 , wherein the touch line is on the same layer as the source electrode and the drain electrode of the transistor formation layer. 11 . The in-cell touch display device according to claim 9 , wherein the touch line is provided in a direction parallel to the data line and on a layer different from the source electrode and the drain electrode of the transistor formation layer.

12. The embedded touch display device according to claim 1, wherein during a touch period, a touch drive signal having a predetermined period and amplitude is applied to a touch electrode among the plurality of touch electrodes, and a low-potential modulation voltage having the same period and amplitude as the touch drive signal is applied to the cathode electrode.

13. An embedded touch display device, comprising: a display panel comprising: a plurality of sub-pixels including light-emitting elements and thin film transistors, and a plurality of touch electrodes located in a transistor formation layer including the thin film transistors and forming coupling capacitors with cathode electrodes of the light-emitting elements, the cathode electrodes being disposed above the plurality of touch electrodes; and A sensing circuit is configured to sense a touch signal by primarily integrating a signal output from a touch electrode among the plurality of touch electrodes and secondarily integrating the integrated signal.

14. The in-cell touch display device according to claim 13, wherein the sensing circuit comprises: a first integrator configured to once integrate a signal output from the touch electrode; and A second integrator is configured to double-integrate the signal integrated by the first integrator.

15. The in-cell touch display device according to claim 14, wherein the first integrator comprises: a first operational amplifier having a first input terminal configured to receive an output signal of the touch electrode and a second input terminal to which a reference voltage is applied; as well as A first feedback capacitor is connected between the output terminal of the first operational amplifier and the first input terminal.

16. The in-cell touch display device according to claim 15, wherein the second integrator comprises: a second operational amplifier having a third input terminal electrically connected to the output terminal of the first operational amplifier and a fourth input terminal to which the reference voltage is applied; as well as A second feedback capacitor is connected between the output terminal of the second operational amplifier and the third input terminal.

17. The embedded touch display device according to claim 16, wherein during a touch period, a touch drive signal having a predetermined period and amplitude is applied to the touch electrode, a low-voltage modulation voltage having the same period and amplitude as the touch drive signal is applied to the cathode electrode, and the reference voltage having the same period and amplitude as the touch drive signal is applied to the second input terminal of the first operational amplifier and the fourth input terminal of the second operational amplifier.

18. The in-cell touch display device according to claim 13, wherein the display panel comprises: substrate; The transistor forming layer on the substrate, the transistor forming layer including 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 an anode electrode, a light emitting layer and the cathode electrode; and a cover layer on the light emitting element layer, the cover layer having an object capacitor between the touch object and the cathode electrode when a touch object touches the cover layer, The plurality of touch electrodes are located in the transistor formation layer and all form the coupling capacitor with the cathode electrode of the light emitting element layer. 19 . The in-cell touch display device according to claim 18 , wherein when the touch object touches the cover layer, the sensing circuit senses capacitance changes of the object capacitor and the coupling capacitor through two integrators. 20 . The in-cell touch display device according to claim 18 , wherein the touch electrode is located on the substrate in the transistor formation layer, or is provided on the same layer as the gate electrode, or is provided on the same layer as the source electrode and the drain electrode.

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