In-cell touch display device

Abstract

Provided herein is 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 on the substrate, the transistor forming layer including a semiconductor, a source electrode connected to the semiconductor, a drain electrode connected to the semiconductor, a gate electrode overlapping the semiconductor, and a plurality of touch lines; and a light emitting element layer on the transistor forming layer, the light emitting element layer including an anode electrode, a light emitting layer on the anode electrode, a cathode electrode on the light emitting layer, and a bank layer on a portion of the anode electrode. The cathode electrode is connected to the plurality of touch lines, and the touch lines are closer to the cathode electrode than the source electrode and the drain 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 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 or more embodiments of the present disclosure, an embedded touch display device may include: a substrate; a transistor forming layer on the substrate, the transistor forming layer including a semiconductor, a source electrode connected to the semiconductor, a drain electrode connected to the semiconductor, a gate electrode overlapping the semiconductor, and a plurality of touch lines; and a light-emitting element layer on the transistor forming layer, the light-emitting element layer including an anode electrode, a light-emitting layer on the anode electrode, a cathode electrode on the light-emitting layer, and a dam layer on a portion of the anode electrode, wherein the cathode electrode is connected to a touch line among the plurality of touch lines, and the plurality of touch lines are closer to the cathode electrode than to the source electrode and the drain electrode.

[0009] According to one or more other embodiments of the present disclosure, an embedded touch display device may include: a display panel including a plurality of sub-pixels having a light-emitting element and a thin film transistor, the display panel including a touch line on a backplane of the thin film transistor, and the light-emitting element including a cathode electrode connected to the touch line; and a sensing circuit configured to sense a touch signal by amplifying a signal of the touch line, differentiating the amplified signal, integrating the differentiated signal to generate an integrated signal, and integrating the integrated signal.

[0010] According to one or more other embodiments of the present disclosure, an embedded touch display device may include: a substrate; an insulating layer on the substrate; a thin film transistor, the thin film transistor including: a semiconductor on the insulating layer, a gate electrode, a source electrode connected to the semiconductor, and a drain electrode connected to the semiconductor; a first planarization layer on the source electrode and the drain electrode; a touch line on the first planarization layer, the touch line not overlapping with the thin film transistor; a second planarization layer on the first planarization layer and the touch line; and a light-emitting element on the second planarization layer, the light-emitting element including: an anode electrode connected to the drain electrode, a light-emitting layer on the anode electrode, and a cathode electrode on the light-emitting layer connected to the touch line. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 An in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0012] Figure 2 A timing diagram of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] Figure 6A and Figure 6B 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.

[0017] Figure 7A and Figure 7B 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.

[0018] Figure 8 A power modulation circuit applied to an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0019] Figure 9 A schematic structure of a touch sensor of a display panel in an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0020] Figure 10 A cross-sectional view of a display panel of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0021] Figure 11 A sensing circuit in an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0022] Figure 12 A driving timing diagram of an in-cell touch display device according to an embodiment of the present disclosure is shown.

[0023] Figure 13 A display panel in an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0024] Figure 14 Shown is one or more embodiments according to the present disclosure Figure 13 Equivalent circuit diagram of the touch unit.

[0025] Figure 15One or more embodiments according to the present disclosure are shown. Figure 13 The touch position and the output value of the touch line.

[0026] Figure 16 A sensing circuit in an in-cell touch display device according to one or more 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 used to describe the embodiments of the present application are exemplary, and therefore 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 provided 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, 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 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 circuit 210 can generate a high potential power voltage V based on an input power source VIN and a ground power source 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 Vgl 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 mod2One 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 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 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 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 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 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_modThe 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 fbThe amount of charge in the touch screen becomes relatively small, thereby deteriorating the touch performance.

[0070] As described above, when an in-cell touch display 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 TE 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 4B 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.

[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 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 .

[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 Vgh 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 supply 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 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 .

[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 touchThe 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 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 7A and Figure 7B 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.

[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]

[0095] in this case, Figure 6B The following shows that the d = Voltage characteristics of the value of 50kHz.

[0096] 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 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.

[0097] Figure 8 A power modulation circuit applied to an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0098] Reference Figure 8 , with a resistor of the same value R mod1 and Rmod2 、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.

[0099] 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.

[0100] 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.

[0101] The in-cell touch display device according to one or more embodiments of the present disclosure may allow an in-cell touch sensor technology to be implemented without a separate touch electrode in an organic light emitting diode display panel.

[0102] Figure 9 A schematic structure of a touch sensor of a display panel of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0103] Reference Figure 9 The display panel 100 may be divided into a plurality of regions including a predetermined number of sub-pixels SP. One region may be defined as a touch unit 110.

[0104] The cathode electrode CE in the touch unit 110 (see Figure 10 ) can be connected to the touch line TL. The touch unit 110 performs the function of a touch sensor without using a separate touch electrode. For example, the cathode electrode CE (see Figure 10) can be formed integrally, and the cathode electrode CE can be divided into a plurality of touch units 110 according to the touch lines TL. For example, a nearby area including a portion connected to one touch line TL can be defined or understood as one touch unit 110 (e.g., a virtual touch unit) in touch driving / sensing. In addition, the touch unit 110 can be a region including a plurality of sub-pixels SP.

[0105] The touch line TL can be connected to the external sensing circuit 500 (see Figure 11 ).

[0106] The touch line TL can be formed when manufacturing the backplane of the thin film transistor, and the touch line TL and the cathode electrode CE can be connected when the cathode electrode CE is deposited after the organic material is deposited. For example, after using an inverted cone structure or evaporating the organic material using a laser, the touch line TL can be connected to the cathode electrode CE.

[0107] Figure 10 A cross-sectional view of a display panel of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0108] The display panel 100 of the in-cell touch display device according to one or more embodiments of the present disclosure may include a substrate SUB; a transistor formation layer TRL in which a thin film transistor TFT is formed; a light emitting element layer EEL; and a cover layer CL.

[0109] 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.

[0110] 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).

[0111] 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, an object capacitor C may be formed between the touch object and the cathode electrode. f (See Figure 11 ).

[0112] The transistor formation layer TRL will be described in more detail below.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] The touch line TL may be formed on the second planarization layer 119. The second planarization layer 119 may include an organic insulating material.

[0118] The touch line TL may be formed in the transistor formation layer TRL at a position not overlapping with the semiconductor 112 , the source electrode 116 , the drain electrode 117 , and the gate electrode 114 .

[0119] The light emitting element layer EEL will be described in more detail below.

[0120] The anode electrode AE of the light emitting element layer EEL may be formed on the second planarization layer 119. A portion of the second planarization layer 119 may directly contact a portion of the upper surface of the touch line TL. The anode electrode AE may be electrically connected to the drain electrode 117 of the thin film transistor TFT through a pixel contact hole.

[0121] The light emitting layer EL of the light emitting element layer EEL may be formed of an organic material on the anode electrode AE.

[0122] The cathode electrode CE of the light emitting element layer EEL may be formed on the light emitting layer EL. A portion of the cathode electrode CE may directly contact a side surface of the second planarization layer 119 .

[0123] 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.

[0124] Furthermore, a touch contact hole may be formed in the bank layer 120. The touch contact hole may pass through: a portion of the light-emitting layer EL overlapping with the touch line TL; a metal layer overlapping with the touch line TL, spaced apart from the anode electrode AE, and made of the same material as the anode electrode AE; and the second planarization layer 119. A portion of the cathode electrode CE may directly contact the side surface of the portion of the metal layer overlapping with the touch line TL. The touch line TL may be electrically connected to the cathode electrode CE through the touch contact hole. Figure 10 The touch contact hole is shown as passing through the metal layer 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.

[0125] During the touch period, a low potential modulation voltage V with a predetermined period and amplitude is applied. ss_mod May be applied to at least one of the cathode electrode CE and the touch line TL.

[0126] Figure 11 A sensing circuit in an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0127] Reference Figure 11 , the in-cell touch display device according to the present disclosure may include a display panel 100 and a sensing circuit 500 .

[0128] The display panel 100 may include a plurality of sub-pixels including light-emitting elements and thin film transistors. The display panel 100 may include a cathode electrode CE of the light-emitting element and a touch line TL. Here, the touch line TL may be formed on the transistor formation layer TRL and may be connected to the cathode electrode CE of the light-emitting element.

[0129] The cathode electrode CE may be integrally formed and may be divided into regions of a plurality of touch units 110 according to the touch lines TL (see FIG. Figure 9 The cathode electrode CE may have a sheet resistor R s , the touch line TL may have an internal resistor R ro .

[0130] During the touch period, the low potential power supply voltage V ss The low potential modulation voltage V can be modulated with a predetermined period and amplitude ss_mod is applied to the cathode electrode CE and the touch line TL.

[0131] When an object touches the display panel 100, an object capacitor C may be formed between the object and the cathode electrode CE. f, and forms a capacitor C in the object f The touch current i s1 、i s2 The thin film resistor R of the cathode electrode CE can be s Output to multiple touch lines TL.

[0132] For example, the first touch line may be connected to the first output pad ch1, the second touch line may be connected to the second output pad ch2, and the third touch line may be connected to the third output pad ch3. Here, the first output pad ch1, the second output pad ch2, and the third output pad ch3 may be connected to the sensing circuit 500.

[0133] The thin film resistor R flows through the cathode electrode CE s Touch current i s1 、i s2 It can output to multiple touch lines TL and flow through the internal resistor R of multiple touch lines TL. ro Touch current i ro1 、i ro2 、i ro3 The signals can be output to the sensing circuit 500 through corresponding output pads.

[0134] According to the touch position, the touch current i flows through multiple touch lines TL. ro1 、i ro2 、i ro3 The value of the cathode electrode CE sheet resistor R s And change.

[0135] For example, Figure 11 As shown in FIG, due to the thin layer resistor R s The resistance value of the thin film resistor R s The distance from the touch position (object capacitor) increases, so the value of the touch current flowing through the touch line far from the touch position can gradually decrease. As a result, the second touch current i flowing through the touch line close to the touch position ro2 The first touch current i may be greater than the first touch current i flowing through the adjacent touch line. ro1 and the third touch current i ro3 The sensing circuit 500 can sense the touch current flowing through the plurality of touch lines and detect the touch position based on the strength of the touch current. For example, the touch coordinates of the plurality of touch lines can be preset, and the touch position can be determined based on the touch coordinates of the touch line having the greater current strength among the plurality of touch lines.

[0136] A detailed configuration of the sensing circuit 500 will be described below.

[0137] The sensing circuit 500 may output a touch sensing signal V by amplifying a signal flowing through the touch line TL, differentiating the amplified signal, integrating the differentiated signal once, and integrating the integrated signal twice. sen .

[0138] The sensing circuit 500 can convert the touch sensing signal V sen Provided to an analog-to-digital converter (not shown), the analog-to-digital converter can convert the touch sensing signal V sen Converted into touch sensing data DA as a digital signal _sen The sensing circuit 500 and the analog-to-digital converter may be included in the touch driving circuit ROIC. The touch driving circuit ROIC may convert the touch sensing signal V sen Touch sensing data DA _sen Provided to the controller 300 (see Figure 1 ).

[0139] The sensing circuit 500 may include a sensing resistor R sen , amplifier 530 (eg, amplifier circuit 530 ), differential capacitor C diff , a first integrator 540 (eg, a first integrator circuit 540 ), and a second integrator 550 (eg, a second integrator circuit 550 ).

[0140] Sense resistor R sen One end is connected to the touch line TL and the other end is connected to the low potential power supply voltage V ss supply side.

[0141] Sense resistor R sen It has the function of converting the current signal flowing through the touch line TL into a voltage signal. Here, during the touch period, a low potential modulation voltage V with a predetermined period and amplitude is ss_mod The low potential power supply voltage can be applied to the sensing resistor R sen the other end.

[0142] The amplifier 530 can amplify and apply the signal to the sensing resistor R sen The difference between the voltages at both ends corresponds to the voltage and the amplified voltage is output.

[0143] The amplifier 530 may include: a first input resistor R 11 , the first input resistor R 11 One end is connected to the sensing resistor R sen One end of the second input resistor R 12 , the second input resistor R 12 One end is connected to the sensing resistor R senIn addition, the amplifier 530 may include an operational amplifier AMP (eg, an operational amplifier circuit) having a first input resistor R 11 The other end is connected to the first input terminal and the second input resistor R 12 A second input terminal connected to the other end of the operational amplifier AMP; and a feedback resistor R connected between the first input terminal and the output terminal 21 .

[0144] Differential capacitor C diff One end of is connected to the output terminal of the amplifier 530 and the other end is connected to the first integrator 540 .

[0145] Differential capacitor C diff The signal amplified by the amplifier 530 is differentiated and the differentiated signal is output. Differentiation capacitor C diff The touch screen has a function of reducing deviation of a touch signal caused by a difference in resistance value of the touch line TL of each channel of the display panel 100 .

[0146] The first integrator 540 converts the differential capacitor C diff The output signal is integrated once.

[0147] The first integrator 540 may include an operational amplifier AMP having a circuit that receives a differential capacitor C diff The first input terminal of the output signal is applied with a reference voltage V ref and a first feedback capacitor C connected between the first input terminal and the output terminal of the operational amplifier AMP. fb1 .

[0148] The second integrator 550 integrates the output signal of the first integrator 540 twice.

[0149] The second integrator 550 may include an operational amplifier AMP having a first input terminal receiving the output signal of the first integrator 540 and a reference voltage V applied thereto. ref and a second feedback capacitor C connected between the first input terminal and the output terminal of the operational amplifier AMP. fb2 .

[0150] A transfer resistor R may be further connected between the output terminal of the first integrator 540 and the first input terminal of the second integrator 550. 31 .

[0151] Furthermore, according to another embodiment of the present disclosure, although Figure 115. It is not shown in the figure, but a switch circuit may be connected between the output terminal of the first integrator 540 and the first input terminal of the second integrator 550 instead of the transmission resistor R. 31 The switch circuit may transmit the signal output from the first integrator 540 rising from a low level to a high level or the signal falling from a high level to a low level to the second integrator 550 .

[0152] The second integrator 550 may integrate the signal rising from a low level to a high level and output the integrated signal as the touch sensing signal V sen , or integrate the signal that drops from a high level to a low level and output the integrated signal as the touch sensing signal V sen .

[0153] During the touch period, a low potential modulation voltage V with a predetermined period and amplitude is applied. ss_mod A voltage may be applied to the cathode electrode CE and the touch line TL of the display panel 100 and the sensing resistor R of the sensing circuit 500. sen In addition, with the low potential modulation voltage V ss_mod The modulated reference voltage V ref_mod It can be applied to the first integrator 540 and the second integrator 550.

[0154] The in-cell touch display device according to the present disclosure applies a low potential power supply voltage V to the touch line TL during the display period. ss And the low potential power supply voltage V ss Supplied to the cathode electrode CE.

[0155] The embedded touch display device of the present disclosure drives a modulated display voltage V having a predetermined period and amplitude during a touch period. dd_mod 、V ss_mod 、V gamma_mod 、V gh_mod 、V gl_mod Equal and modulated reference voltage V ref_mod At this time, these modulation signals are transmitted from the object capacitor C f The touch current i s1 、i s2 、i ro1 、i ro2 、i ro3 The voltage is output to the sensing circuit 500 through the cathode electrode CE and the touch line TL.

[0156] Since the touch current i flows through multiple touch lines TL according to the touch position ro1 、i ro2 、i ro3 The value can be determined based on the sheet resistor R sThe touch position can be determined by using these values.

[0157] For example, since the touch line close to the touch position has a smaller sheet resistor R of the cathode electrode CE s Therefore, a touch current greater than the touch current flowing through other adjacent touch lines flows through the touch line. Therefore, the touch coordinates can be detected by the position coordinates of the touch line with the larger touch current among the multiple touch lines.

[0158] Since the sensing circuit 500 is powered by a low potential power supply voltage V ss , a sensing resistor R with a constant resistance value sen and amplifier 530, so when an object touches it, a touch current i flows. ro1 、i ro2 、i ro3 When the sensing resistor R sen The voltage difference between the two ends of the touch line TL changes, and the voltage difference is sensed by amplifying it through the amplifier 530. ro The touch current i ro1 、i ro2 、i ro3 IR drops, flowing through the sense resistor R sen The base current is different for each location where the touch line TL is connected, so the base current is different at each location. Here, the base current may be defined as the current flowing through the touch line TL before being touched.

[0159] In order to solve this problem, the differential capacitor C diff The output signal of the amplifier 530 is differentiated and the differentiated signal is integrated by the first integrator 540 and the second integrator 550 to detect a touch signal, and the detected touch signal is converted into a touch sensing signal V sen And output.

[0160] Figure 12 A driving timing diagram of an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0161] In the driving simulation, it is assumed that a low potential modulation voltage V having a predetermined period and amplitude is applied to at least one of the touch line TL and the cathode electrode CE. ss_mod , thus modulating the voltage of the object FIN based on the display panel.

[0162] Here, ① shows a low potential modulation voltage V having a predetermined period and amplitude during the touch period. ss_mod A signal is applied to the touch line TL and the cathode electrode CE.

[0163] ② shows the low potential modulation voltage V ss_mod ③ shows the internal resistor R of the touch line TL. ro The signal output to the amplifier 530.

[0164] ④ shows the current flowing through the sensing resistor R sen When an object touches the display panel 100, the sensing resistor R sen ⑤ shows the amplified signal output from the amplifier 530.

[0165] ⑥ shows that by using the differential capacitor C diff ⑦ shows a signal obtained by differentiating the amplified signal ⑤. ⑦ shows a signal obtained by once integrating the differentiated signal ⑥ by the first integrator 540.

[0166] ⑧ shows a signal obtained by doubly integrating the once-integrated signal ⑦ through the second integrator 550. The signal ⑧ output from the second integrator 550 may be the restored signal ①.

[0167] Figure 13 A display panel of an in-cell touch display device according to one or more embodiments of the present disclosure is shown. Figure 14 Shown is one or more embodiments according to the present disclosure Figure 13 Equivalent circuit diagram of the touch unit. Figure 15 One or more embodiments according to the present disclosure are shown. Figure 13 The touch position and the output value of the touch line.

[0168] Through Figure 13 The display panel 100 of the configuration shown in FIG is simulated to check the operation characteristics. First, the touch unit 110 has a thin layer 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.

[0169] 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 display panel 100. ss Resistor R ol and parasitic capacitor C pThe size of is set to be equal to the value of 20 touch units 110 in the display panel.

[0170] 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 15 The low potential modulation voltage V applied by the pulse of the modulation control voltage can be output from 3 to 4 areas of the touch line TL. ss_mod Instead of diffusing into the thin layer resistor of the panel to obtain the touch position.

[0171] Figure 16 A sensing circuit in an in-cell touch display device according to one or more embodiments of the present disclosure is shown.

[0172] Reference Figure 16 , the sensing circuit 500 may include: a first sensing resistor R sen , the first sensing resistor R sen One end is connected to the first touch line and the other end is connected to the low potential power supply voltage V ss The supply end; a first amplifier 532, the first amplifier 532 is used to amplify and apply to the first sensing resistor R sen The difference between the voltages at both ends of the resistor R corresponds to the voltage and outputs the amplified voltage; the second sensing resistor R sen , the second sensing resistor R sen One end is connected to the second touch line and the other end is connected to the low potential power supply voltage V ss and a second amplifier 534, the second amplifier 534 is used to amplify and apply to the second sensing resistor R sen The difference between the voltages at both ends corresponds to the voltage and the amplified voltage is output.

[0173] Here, the first touch line and the second touch line may be defined as lines connected to adjacent touch units 110. For example, the first touch line may be connected to a first touch unit, and the second touch line may be connected to a second touch unit adjacent to the first touch unit.

[0174] In addition, the sensing circuit 500 may include: a first differential capacitor C diff , the first differential capacitor C diff One end of the second differential capacitor C is connected to the output terminal of the first amplifier 532 and the other end is connected to the input terminal of the first integrator 540; diff , the second differential capacitor C diffOne end of the first integrator 540 is connected to the output terminal of the second amplifier 534 and the other end is connected to the reference voltage input terminal of the first integrator 540; the first integrator 540 is used to receive the first differential capacitor C diff The first output signal and the second differential capacitor C diff and a second integrator 550 for receiving the output signal of the first integrator 540 and the reference voltage V ref And the output signal and the reference voltage V ref Quadratic integral.

[0175] According to the embodiments of the present disclosure, a touch function can be implemented in a display panel with minimal processes.

[0176] In addition, a low potential power supply voltage can be supplied to the touch line, thereby reducing the internal resistance.

[0177] 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.

[0178] Furthermore, since there is no touch electrode on the organic light emitting diode, transmittance can be improved compared to conventional touch technologies.

[0179] Furthermore, since the touch wire serves as a touch electrode, top emission and bottom emission of the organic light emitting diode can be achieved.

[0180] Furthermore, since the touch wires serve as touch electrodes, double-sided touch is enabled.

[0181] Furthermore, process optimization can be achieved by reducing touch costs and production energy.

[0182] 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.

[0183] According to one or more embodiments 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, a cathode electrode and a dam layer, wherein a plurality of touch lines may be formed in the transistor forming layer, and the cathode electrode may be electrically connected to the plurality of touch lines.

[0184] According to one or more embodiments of the present disclosure, the touch wire may be formed in the transistor formation layer at a position not overlapping with the semiconductor, the source electrode, the drain electrode, and the gate electrode.

[0185] According to one or more embodiments of the present disclosure, the cathode electrode may be integrally formed.

[0186] According to one or more embodiments of the present disclosure, the touch wire may be formed on a planarization layer on the semiconductor, the source electrode, the drain electrode, and the gate electrode in the transistor formation layer.

[0187] According to one or more embodiments of the present disclosure, a contact hole may be formed in at least one of the bank layer, the light emitting layer, and the anode electrode overlapping the touch line, and the cathode electrode may be electrically connected to the touch line through the contact hole.

[0188] According to one or more embodiments of the present disclosure, during a touch period, a low-potential modulation voltage having a predetermined period and amplitude may be applied to at least one of the cathode electrode and the touch line.

[0189] According to one or more embodiments of the present disclosure, the in-cell touch display device may further include a sensing circuit configured to detect a touch signal by amplifying a signal of the touch line, differentiating the amplified signal, and integrating the differentiated signal once and twice.

[0190] According to one or more embodiments of the present disclosure, the sensing circuit may include: a sensing resistor, one end of which is connected to the touch line and the other end is connected to a supply end of a low-potential power supply voltage; an amplifier, which is configured to amplify a voltage corresponding to a difference between voltages applied to both ends of the sensing resistor; a differential capacitor, one end of which is connected to an output terminal of the amplifier and the other end is connected to a first integrator; the first integrator is configured to integrate the output signal of the differential capacitor once; and a second integrator is configured to integrate the output signal of the first integrator twice.

[0191] According to one or more embodiments of the present disclosure, during a touch period, a low-voltage modulation voltage having a predetermined period and amplitude may be applied to the cathode electrode and the touch line, and a reference voltage having the same period and amplitude as the low-voltage modulation voltage may be applied to the first integrator and the second integrator.

[0192] According to one or more other embodiments of the present disclosure, an embedded touch display device may include: a display panel, the display panel including a plurality of sub-pixels having a light-emitting element and a thin film transistor, a touch line formed on a backplane of the thin film transistor, and a cathode electrode of the light-emitting element connected to the touch line; and a sensing circuit configured to sense a touch signal by amplifying a signal flowing through the touch line, differentiating the amplified signal, integrating the differentiated signal once, and integrating the integrated signal twice.

[0193] According to one or more other embodiments of the present disclosure, the plurality of sub-pixels may be divided into a plurality of regions, one region including a predetermined number of sub-pixels is defined as a touch unit, and cathode electrodes of the sub-pixels in the touch unit may be connected to one touch line.

[0194] According to one or more other embodiments of the present disclosure, the cathode electrode may be integrally formed.

[0195] According to one or more other embodiments of the present disclosure, the sensing circuit may include: a sensing resistor, one end of which is connected to the touch line and the other end is connected to the supply end of the low-potential power supply voltage; an amplifier, which is configured to amplify a voltage corresponding to the difference between the voltages applied to the two ends of the sensing resistor and output the amplified voltage; a differential capacitor, one end of which is connected to the output terminal of the amplifier and the other end is connected to a first integrator; a first integrator configured to integrate the output signal of the differential capacitor once; and a second integrator configured to integrate the output signal of the first integrator twice.

[0196] According to one or more other embodiments of the present disclosure, during a touch period, a low-potential modulation voltage having a predetermined period and amplitude may be applied to the other end of the sensing resistor through a supply end of the low-potential power supply voltage.

[0197] According to one or more other embodiments of the present disclosure, the amplifier may include: a first input resistor, one end of which is connected to one end of the sensing resistor; a second input resistor, one end of which is connected to the other end of the sensing resistor; a first operational amplifier, the first operational amplifier having a first input terminal connected to the other end of the first input resistor and a second input terminal connected to the other end of the second input resistor; and a feedback resistor connected between an output terminal of the first operational amplifier and the first input terminal.

[0198] According to one or more other embodiments of the present disclosure, the first integrator may include: a second operational amplifier having a third input terminal configured to receive a signal output through the differential capacitor and a fourth input terminal to which a reference voltage is applied; and a first feedback capacitor connected between the output terminal of the second operational amplifier and the third input terminal.

[0199] According to one or more other embodiments of the present disclosure, the second integrator may include: a third operational amplifier having a fifth input terminal configured to receive the output signal of the first integrator and a sixth input terminal to which the reference voltage is applied; and a second feedback capacitor connected between the output terminal of the third operational amplifier and the fifth input terminal.

[0200] According to one or more other embodiments of the present disclosure, the in-cell touch display device may further include a transmission resistor connected between the output terminal of the first integrator and the fifth input terminal of the second integrator.

[0201] According to one or more other embodiments of the present disclosure, the embedded touch display device may further include a switching circuit arranged between the output terminal of the first integrator and the fifth input terminal of the second integrator to send a signal rising from a low level to a high level to the second integrator or to send a signal falling from a high level to a low level to the second integrator.

[0202] According to one or more other embodiments of the present disclosure, during a touch period, a low-voltage modulation voltage having a predetermined period and amplitude may be applied to the cathode electrode and the touch line, and a reference voltage having the same period and amplitude as the low-voltage modulation voltage may be applied to the first integrator and the second integrator.

[0203] According to one or more other embodiments of the present disclosure, the sensing circuit may include: a first sensing resistor, one end of which is connected to a first touch line and the other end is connected to a supply end of a low-potential power supply voltage; a first amplifier, the first amplifier being configured to amplify a voltage corresponding to a difference between voltages applied to both ends of the first sensing resistor and output the amplified voltage; a second sensing resistor, one end of which is connected to a second touch line and the other end is connected to a supply end of the low-potential power supply voltage; a second amplifier, the second amplifier being configured to amplify a voltage corresponding to a difference between voltages applied to both ends of the second sensing resistor and output the amplified voltage; a first differential capacitor an integrator, wherein one end of the first differential capacitor is connected to the output terminal of the first amplifier and the other end is connected to the input terminal of the first integrator; a second differential capacitor, wherein one end of the second differential capacitor is connected to the output terminal of the second amplifier and the other end is connected to the input terminal of the reference voltage of the first integrator; the first integrator is configured to receive a first output signal of the first differential capacitor and a second output signal of the second differential capacitor and to integrate the first output signal and the second output signal once; and a second integrator is configured to receive the output signal of the first integrator and the reference voltage and to integrate the output signal of the first integrator and the reference voltage twice.

[0204] According to one or more other embodiments of the present disclosure, the plurality of sub-pixels may be divided into a plurality of regions, a region including a predetermined number of sub-pixels may be defined as a touch unit, and first and second touch lines may be defined as lines connecting adjacent touch units.

[0205] According to one or more further embodiments of the present disclosure, an embedded touch display device may include: a substrate; an insulating layer on the substrate; a thin film transistor, the thin film transistor including: a semiconductor on the insulating layer, a gate electrode, a source electrode connected to the semiconductor, and a drain electrode connected to the semiconductor; a first planarization layer on the source electrode and the drain electrode; a touch line on the first planarization layer, the touch line not overlapping with the thin film transistor; a second planarization layer on the first planarization layer and the touch line; and a light-emitting element on the second planarization layer, the light-emitting element including: an anode electrode connected to the drain electrode, a light-emitting layer on the anode electrode, and a cathode electrode on the light-emitting layer connected to the touch line.

[0206] According to still another one or more embodiments of the present disclosure, the touch wire does not overlap with the semiconductor, the source electrode, the drain electrode, and the gate electrode.

[0207] According to one or more further embodiments of the present disclosure, the cathode electrode is connected to the touch line through a hole passing through the light emitting layer, a metal layer made of the same material as the anode electrode and separated from the anode electrode, and the second planarization layer.

[0208] According to still another one or more embodiments of the present disclosure, a portion of the cathode electrode directly contacts a side surface of a portion of the metal layer overlapping the touch line.

[0209] According to still another one or more embodiments of the present disclosure, a portion of the cathode electrode directly contacts a side surface of the second planarization layer.

[0210] According to still another one or more embodiments of the present disclosure, a portion of the second planarization layer directly contacts a portion of the upper surface of the touch wire.

[0211] According to the embodiments of the present disclosure, a touch function may be implemented in a display panel with minimal or at least reduced processes.

[0212] In addition, a low potential power supply voltage can be supplied to the touch line, thereby reducing the internal resistance.

[0213] 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.

[0214] Furthermore, since there is no touch electrode on the organic light emitting diode, transmittance can be improved compared to conventional touch technologies.

[0215] Furthermore, since the touch wire serves as a touch electrode, top emission and bottom emission of the organic light emitting diode can be achieved.

[0216] Furthermore, since the touch wires serve as touch electrodes, double-sided touch is enabled.

[0217] Furthermore, process optimization can be achieved by reducing touch costs and production energy.

[0218] 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.

[0219] Specific effects together with the above-mentioned effects are described together with the description of the following details for implementing the present disclosure.

[0220] 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 formation layer on the substrate, the transistor formation layer including a semiconductor, a source electrode connected to the semiconductor, a drain electrode connected to the semiconductor, a gate electrode overlapping the semiconductor, and a plurality of touch lines; as well as a light emitting element layer on the transistor formation layer, the light emitting element layer including an anode electrode, a light emitting layer on the anode electrode, a cathode electrode on the light emitting layer, and a bank layer on a portion of the anode electrode, The cathode electrode is connected to a touch line among the plurality of touch lines, and the plurality of touch lines are closer to the cathode electrode than to the source electrode and the drain electrode. 2 . The in-cell touch display device according to claim 1 , wherein the touch line does not overlap with the semiconductor, the source electrode, the drain electrode, and the gate electrode in the transistor formation layer. 3 . The in-cell touch display device according to claim 1 , wherein the cathode electrode is integrally formed throughout the light emitting element layer. 4 . The in-cell touch display device according to claim 1 , wherein the touch line is located on a planarization layer on the semiconductor, the source electrode, the drain electrode, and the gate electrode in the transistor formation layer.

5. The in-cell touch display device according to claim 1 , further comprising: A contact hole is provided in a portion of at least one of the bank layer, the light emitting layer, and the anode electrode that overlaps with the touch line, the cathode electrode being electrically connected to the touch line through the contact hole. 6 . The in-cell touch display device according to claim 1 , wherein during a touch period, a low-potential modulation voltage having a predetermined period and a predetermined amplitude is applied to at least one of the cathode electrode and the touch line. 7 . The in-cell touch display device according to claim 1 , further comprising a sensing circuit configured to detect a touch signal by amplifying a signal of the touch line, differentiating the amplified signal, and integrating the differentiated signal multiple times.

8. The in-cell touch display device according to claim 7, wherein the sensing circuit comprises: a sensing resistor having a first end and a second end, the first end of the sensing resistor being connected to the touch line and the second end of the sensing resistor being connected to a supply end of a low-potential power supply voltage; an amplifier circuit connected to the sense resistor, the amplifier circuit amplifying a voltage corresponding to a difference between voltages applied to the first and second ends of the sense resistor; a differential capacitor having a first end and a second end, the first end of the differential capacitor being connected to an output terminal of the amplifier circuit; a first integrator circuit connected to the second end of the differential capacitor, the first integrator circuit integrating an output signal of the differential capacitor; as well as A second integrator circuit is connected to the first integrator circuit, the second integrator circuit integrating an output signal of the first integrator circuit.

9. The in-cell touch display device according to claim 8, wherein: During a touch period, a low potential modulation voltage having a predetermined cycle and a predetermined amplitude is applied to the cathode electrode and the touch line, and a reference voltage having the predetermined cycle and the predetermined amplitude is applied to the first and second integrator circuits.

10. An embedded touch display device, comprising: A display panel including a plurality of sub-pixels having light-emitting elements and thin film transistors, the display panel including a touch line on a backplane of the thin film transistors, and the light-emitting elements including cathode electrodes connected to the touch line; and A sensing circuit is configured to sense a touch signal by amplifying a signal of the touch line, differentiating the amplified signal, integrating the differentiated signal to generate an integrated signal, and integrating the integrated signal.

11. The embedded touch display device according to claim 10, wherein the plurality of sub-pixels are divided into a plurality of regions, a region in the plurality of regions including a predetermined number of sub-pixels among the plurality of sub-pixels is defined as a touch unit, and cathode electrodes of the predetermined number of sub-pixels in the touch unit are connected to the same touch line among the plurality of touch lines. 12 . The in-cell touch display device according to claim 11 , wherein the cathode electrode is integral with the plurality of sub-pixels.

13. The in-cell touch display device according to claim 11, wherein the sensing circuit comprises: a sensing resistor having a first end and a second end, the first end of the sensing resistor being connected to the touch line and the second end of the sensing resistor being connected to a supply end of a low-potential power supply voltage; an amplifier circuit connected to the sense resistor, the amplifier circuit amplifying a voltage corresponding to a difference between voltages applied to the first and second ends of the sense resistor; a differential capacitor having a first end and a second end, the first end of the differential capacitor being connected to an output terminal of the amplifier circuit; a first integrator circuit connected to the second end of the differential capacitor, the first integrator circuit integrating an output signal of the differential capacitor; as well as A second integrator circuit is connected to the first integrator circuit, the second integrator circuit integrating an output signal of the first integrator circuit.

14. The in-cell touch display device according to claim 13, wherein: During a touch period, a low-level modulation voltage having a predetermined period and a predetermined amplitude is applied to the second end of the sensing resistor through the supply end.

15. The in-cell touch display device according to claim 13, wherein the amplifier circuit comprises: a first input resistor having a first end and a second end, the first end of the first input resistor being connected to the first end of the sense resistor; a second input resistor having a first end and a second end, the first end of the second input resistor being connected to the second end of the sense resistor; a first operational amplifier circuit having a first input terminal connected to the second end of the first input resistor and a second input terminal connected to the second end of the second input resistor; as well as A feedback resistor is connected to the output terminal of the first operational amplifier circuit and the first input terminal.

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

17. The in-cell touch display device according to claim 16, further comprising: A transmission resistor connected to the output terminal of the first integrator circuit and the fifth input terminal of the second integrator circuit.

18. The in-cell touch display device according to claim 16, further comprising: a switch circuit connected to the output terminal of the first integrator circuit and the fifth input terminal of the second integrator circuit, wherein: the switch circuit transmits the first signal rising from a low level to a high level to the second integrator circuit, or The switch circuit transmits the second signal falling from the high level to the low level to the second integrator circuit.

19. The in-cell touch display device according to claim 13, wherein: During a touch period, a low potential modulation voltage having a predetermined cycle and a predetermined amplitude is applied to the cathode electrode and the touch line, and a reference voltage having the predetermined cycle and the predetermined amplitude is applied to the first and second integrator circuits.

20. The in-cell touch display device according to claim 11, wherein the sensing circuit comprises: a first sensing resistor having a first end and a second end, the first end of the first sensing resistor being connected to a first touch line among the plurality of touch lines and the second end of the first sensing resistor being connected to a supply end of a low-potential power supply voltage; a first amplifier circuit connected to the first sensing resistor, the first amplifier circuit outputting a first amplified voltage by amplifying a first voltage corresponding to a difference between voltages applied to the first end and the second end of the first sensing resistor; a second sensing resistor having a first end and a second end, the first end of the second sensing resistor being connected to a second touch line among the plurality of touch lines and the second end of the second sensing resistor being connected to a supply end of the low-potential power supply voltage; a second amplifier circuit connected to the second sensing resistor, the second amplifier circuit outputting a second amplified voltage by amplifying a second voltage corresponding to a difference between voltages applied to the first end and the second end of the second sensing resistor; a first differential capacitor having a first end and a second end, the first end of the first differential capacitor being connected to the output terminal of the first amplifier circuit and the second end of the first differential capacitor being connected to the input terminal of the first integrator circuit; a second differential capacitor having a first end and a second end, the first end of the second differential capacitor being connected to the output terminal of the second amplifier circuit and the second end of the second differential capacitor being connected to an input terminal of a reference voltage of the first integrator circuit; The first integrator circuit is configured as follows: receiving a first output signal of the first differential capacitor and a second output signal of the second differential capacitor, and integrating the first output signal and the second output signal to generate an output signal; as well as a second integrator circuit having an input terminal connected to the output terminal of the first integrator circuit, the second integrator circuit being configured to: receiving the output signal of the first integrator circuit and the reference voltage of the first integrator circuit, and The output signal of the first integrator circuit and the reference voltage are integrated.

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