Display device

Abstract

A display device according to an example embodiment includes a display portion displaying an image; and a sensing portion arranged on one side of the display portion and sensing an external input, wherein the sensing portion includes at least one first sensing electrode receiving a first sensing signal varying in response to the external input, at least one second sensing electrode arranged to be spaced apart from the first sensing electrode, wherein the first sensing electrode is arranged between the second sensing electrodes, and at least one compensation electrode arranged to be spaced apart from the first sensing electrode and between the first sensing electrodes, and the compensation electrode is applied with a compensation signal, and wherein a phase of the compensation signal is opposite to that of the first sensing signal.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2020-0021842, filed with the Korean Intellectual Property Office on February 21, 2020, the entire contents of which are incorporated herein by reference. Technical Field

[0003] In general, this disclosure relates to a display device. More specifically, this disclosure relates to a display device including sensing electrodes. Background Technology

[0004] Display devices, which are devices for displaying images, include liquid crystal displays (LCDs), light-emitting diode displays, and quantum dot displays.

[0005] In recent years, display devices have been used that incorporate touch sensors that allow users to directly input information using their fingers or pens. Touch sensors can be attached to one side of the display panel or integrated into the display panel.

[0006] Touch sensors can sense external signals through multiple sensing electrodes and transmit these signals to the display panel. However, when the sensing signal contains noise, the noise can affect the brightness of the display panel.

[0007] The information disclosed above in this background section is intended only to enhance the understanding of the background of this disclosure, and therefore may contain information that does not constitute prior art known to a person skilled in the art in this country. Summary of the Invention

[0008] The example embodiment aims to provide a display device capable of preventing brightness variations.

[0009] A display device according to an example embodiment includes: a display portion for displaying an image; and a sensing portion disposed on one side of the display portion and configured to sense an external input, wherein the sensing portion includes: at least one first sensing electrode for receiving a first sensing signal that changes in response to the external input; at least one second sensing electrode disposed spaced apart from the first sensing electrode; and at least one compensation electrode disposed spaced apart from and between the first sensing electrodes, wherein a compensation signal is applied to the compensation electrode, and wherein the compensation signal is out of phase with the first sensing signal.

[0010] Each of the compensation electrodes can be arranged to be spaced apart from, while being surrounded by, the first sensing electrode.

[0011] The first and second sensing electrodes can be respectively arranged in first and second directions and disposed in a grid pattern, and the compensation electrode can be disposed in a direction crossing the direction in which the plurality of first sensing electrodes are disposed.

[0012] The first sensing electrode and the compensation electrode can be arranged on the same layer.

[0013] The first sensing electrode and the compensation electrode can be arranged on different layers, and the compensation electrode can be arranged not to overlap the first sensing electrode.

[0014] The first sensing electrode and the compensation electrode can be arranged on different layers, and the compensation electrode can be arranged to overlap the first sensing electrode.

[0015] The display apparatus can further include a sensing wire arranged between the first and second sensing electrodes and electrically connected with the first or second sensing electrode.

[0016] The first and second sensing electrodes can be respectively dispersed in first and second directions to substantially form a grid pattern, and the compensation electrode can be disposed in a direction parallel to the direction in which the first sensing electrode is disposed.

[0017] A display apparatus according to an example embodiment includes a display part displaying an image; and a sensing part including at least one sensing electrode arranged on one side of the display part and sensing an external input; wherein the sensing part further includes a unit sensor capacitor whose first electrode is electrically connected to a first sensing voltage source, and a compensation capacitor whose first electrode is electrically connected to a compensation voltage source, and the display part can include a first transistor including a first gate electrode, a first active layer overlapping the first gate electrode, and a first source electrode and a first drain electrode electrically connected with the first active layer; a second transistor including a second gate electrode, a second active layer overlapping the second gate electrode, and a second source electrode and a second drain electrode electrically connected with the second active layer, wherein the second source electrode is electrically connected to a data line; a storage capacitor whose first electrode is electrically connected to the second drain electrode and the first gate electrode; and a light emitting diode electrically connected with the first drain electrode, and wherein a phase of a first sensing signal applied from the first sensing voltage source and a compensation signal applied from the compensation voltage source are opposite.

[0018] The display device can further include an overlap capacitor, a first electrode of the overlap capacitor being electrically connected to the sensing part, and a second electrode being electrically connected to the display part; a first point at which the second electrode of the unit sensor capacitor and the first electrode of the overlap capacitor are electrically connected; a second point at which the second electrode of the compensation capacitor and the first electrode of the overlap capacitor are electrically connected; and a third point at which the second electrode of the overlap capacitor is electrically connected to the display part, wherein a voltage change at the third point is less than a predetermined voltage change.

[0019] The display device can further include a display controller applying a control signal for driving the display part, and a sensing controller applying a control signal for driving the sensing electrode.

[0020] The sensing controller can apply the control signal to the first sensing voltage source and the compensation voltage source.

[0021] The first sensing voltage source can apply a signal from a first time, and the compensation voltage source applies a signal from a second time.

[0022] The sensing controller can receive a synchronization signal from the display controller, and can control an application time of the compensation signal and the first sensing signal.

[0023] The sensing part can include at least one first sensing electrode receiving a first sensing signal varying in response to an external input, at least one second sensing electrode arranged to be spaced apart from the first sensing electrode, and at least one compensation electrode arranged between the first sensing electrodes and to which a compensation signal is applied.

[0024] A display device according to an example embodiment includes a display part displaying an image; and a sensing part electrically connected to the display part at a first node through an overlap capacitor, the sensing part including at least one sensing electrode sensing an external input, wherein the display part includes gate lines extending in a first direction, data lines extending in a second direction perpendicular to the first direction, and a compensation voltage line extending in the first direction and arranged perpendicular to the data lines, wherein a compensation signal is applied to the compensation voltage line, a phase of the compensation signal being opposite to a phase of a signal transmitted into the first node through the sensing part.

[0025] The compensation voltage line can apply a signal that is delayed compared to a gate signal applied to the gate lines.

[0026] The display device can further include a display controller applying a control signal for driving the display part, and a sensing controller applying a control signal for driving the sensing electrode, wherein the sensing controller can transmit a synchronization signal to the display controller according to the first sensing signal, and the display controller can generate the compensation signal.

[0027] The display apparatus can further include a third circuit part receiving a synchronization signal from the display controller and the sensing controller, wherein the third circuit part can generate a compensation signal by reflecting the synchronization signal.

[0028] The sensing part can include at least one first sensing electrode receiving a first sensing signal varying in response to an external input, at least one second sensing electrode disposed to be spaced apart from the first sensing electrode, and at least one compensation electrode disposed to be spaced apart from the first sensing electrode and between the first sensing electrodes, and the compensation electrode is applied with a compensation signal.

[0029] According to an example embodiment, noise of a display apparatus generated by an operation of a sensing electrode can be eliminated.

[0030] Accordingly, a change in luminance of a light emitting diode due to an operation of a sensing electrode can be prevented by eliminating noise introduced into a pixel. BRIEF DESCRIPTION OF DRAWINGS

[0031] FIG. 1A and FIG. 1B is a circuit diagram of a display apparatus including a sensing electrode according to an example embodiment.

[0032] FIG. 2 is a waveform diagram of a voltage applied in the example embodiment shown in FIG. 1A and FIG. 1B

[0033] FIG. 3A is a schematic layout diagram of a sensing electrode according to an example embodiment.

[0034] FIG. 3B is a schematic top plan view of a sensing electrode according to an example embodiment.

[0035] FIG. 4A is FIG. 3B a cross-sectional view taken along line III-III' of

[0036] FIG. 4B is FIG. 3B a cross-sectional view taken along line IV-IV' of

[0037] FIG. 5 is a waveform diagram of a voltage applied to a display apparatus according to an example embodiment.

[0038] FIG. 6A and FIG. 6B is a block diagram for describing a voltage applied to a display apparatus according to the present embodiment.

[0039] FIG. 7 is a top plan view of a sensing electrode according to an example embodiment.​

[0040] FIG. 8 is a cross-sectional view taken along the line VIII-VIII' of FIG. 7

[0041] FIG. 9A FIG. 9B FIG. 9C is a schematic layout of a sensing electrode according to an example embodiment.

[0042] FIG. 10 is a top plan view of a sensing electrode according to an example embodiment.

[0043] FIG. 11 is a circuit diagram of a display device according to an example embodiment.

[0044] FIG. 12 is a waveform chart of a voltage applied to a display device in an example embodiment shown in FIG. 11

[0045] FIG. 13A FIG. 13B are block diagrams provided for describing a voltage applied to a display device according to an example embodiment.

[0046] FIG. 14 is a graph illustrating a change in voltage in a display device according to an example embodiment.

[0047] FIG. 15 is a graph illustrating a change in voltage in a display device according to a comparative example.

[0048] FIG. 16 is an equivalent circuit diagram of a pixel in a display device according to an example embodiment. DETAILED DESCRIPTION

[0049] The present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the present disclosure are shown. As this described embodiments can be modified in various different ways, all not departing from the spirit or scope of the present disclosure, the described embodiments should not be construed as limiting the present disclosure but serving as examples thereof.

[0050] The accompanying drawings and the description are to be considered as illustrative and not restrictive in nature. Throughout the specification, like drawing reference numerals will be used to designate like elements throughout the specification.

[0051] Further, for better understanding and ease of description, in the drawings, the size and thickness of each element are arbitrarily shown, but the present disclosure is not limited thereto. In the drawings, the thickness of layers, films, panels, regions, and the like is exaggerated for clarity. In the drawings, the thickness of some layers and regions is exaggerated for better understanding and ease of description.

[0052] ​​​​​It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The word "on" or "over" means positioned on or above, and not necessarily in contact with, the object portion.

[0053] In addition, unless explicitly described to the contrary, the word "comprise" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0054] Further, in this specification, the phrase "on plane" means to observe the object portion from the top, and the phrase "on cross section" means to observe a cross section formed by vertically cutting the object portion from the side.

[0055] In addition, throughout the specification, when "connected to" is used, it not only means that two or more constituent elements are directly connected, but also means that the two or more constituent elements can be indirectly connected through other constituent elements, and can be physically or electrically connected, and "connected to" is referred to as the same thing according to the position or function by different names.

[0056] Hereinafter, a display device including a sensing electrode will be described with reference to FIG. 1A and FIG. 1B and FIG. 2

[0057] FIG. 1A and FIG. 1B are circuit diagrams of a display device including a sensing electrode according to example embodiments, and FIG. 2 are waveform diagrams of voltages applied in example embodiments shown in FIG. 1A and FIG. 1B

[0058] Referring to FIG. 1A , a display device includes a sensing portion 20 including a touch sensor and sensing an external input, and a display panel 10 including a plurality of pixels PX and displaying an image.

[0059] The sensing portion 20 includes a unit sensor capacitor C1 including a sensing electrode, a compensation capacitor C2, and a sensing controller 250. In addition, the unit sensor capacitor C1 can include at least one capacitor, and the sensing portion 20 can further include a plurality of resistors R. Each capacitor is formed of two capacitor electrodes, i.e., a first electrode and a second electrode, and an insulating layer is disposed between the two capacitor electrodes.

[0060] ​​The cell sensor capacitor C1 is electrically connected to the sensing controller 250, and can be implemented as a first sensing electrode and a second sensing electrode, which will be described later. Any external touch is detected by a change in the capacitance stored in the cell sensor capacitor C1.

[0061] The compensation capacitor C2 is electrically connected to the sensing controller 250, and can be implemented as a compensation electrode 230 (refer to FIG. 3A ), which will be described later. The compensation capacitor C2 transmits a voltage for canceling noise that can occur due to the cell sensor capacitor C1.

[0062] The sensing controller 250 includes a first sensing voltage source Vtx, a compensation voltage source Vneg_tx, a second sensing voltage source Vrx, and a common voltage source. A sensing capacitor Ct is disposed between the first sensing voltage source Vtx and the second sensing voltage source Vrx. A first electrode of the sensing capacitor Ct is electrically connected to the first sensing voltage source Vtx through a resistor R1, and a second electrode is electrically connected to the second sensing voltage source Vrx through a resistor R2. The first electrode of the sensing capacitor Ct can also be referred to as a first sensing electrode 210 (refer to FIG. 3A ), and the second electrode of the sensing capacitor Ct can also be referred to as a second sensing electrode 220 (refer to FIG. 3A ). The first sensing voltage source Vtx applies a first sensing signal to the first sensing electrode 210, the voltage of the first sensing signal corresponding to an external input fluctuates, and the second sensing voltage source Vrx applies a signal to the second sensing electrode 220. The compensation voltage source Vneg_tx applies a compensation signal for canceling noise according to the signal of the first sensing voltage source Vtx, and the common voltage source applies a common voltage Vcom.

[0063] The display panel 10 includes a display part 100 including at least one pixel PX and a data driver 130 including a data voltage source Vdata. The display part 100 can be implemented as an organic light emitting display device, a light emitting diode display, a quantum dot display, and a liquid crystal display, etc. Although not illustrated in FIG. 1A , the display panel 10 can further include a gate driver applying a gate signal to the display part 100 and a display controller applying a signal for controlling the gate driver and the data driver 130. The gate driver and the display controller will be described later with reference to FIG. 6A .

[0064] The sensing part 20 can be formed separately from the display panel 10, and thus they can overlap each other, or the sensing part 20 can be integrally formed with the display panel 10.

[0065] Hereinafter, reference will be made to FIG. 1BThe connection relationship between the sensing part 20 and the display panel 10 will be described in detail.

[0066] In the sensing part 20, the first electrode of the cell sensor capacitor C1 is electrically connected to the first sensing voltage source Vtx through at least one resistor R1. Also, the first electrode of the cell sensor capacitor C1 is electrically connected to the second sensing voltage source Vrx through at least one resistor R2. The second electrode of the cell sensor capacitor C1 is electrically connected with the second electrode of the compensation capacitor C2. The second electrode of the cell sensor capacitor C1 is electrically connected with the first electrode of the overlap capacitor C3 at a point which can be referred to as a first point P1, which will be described later.

[0067] The first electrode of the compensation capacitor C2 is electrically connected to the compensation voltage source Vneg_tx through at least one resistor R. The second electrode of the compensation capacitor C2 is electrically connected to a common voltage line to which a common voltage Vcom is applied. Also, as FIG. 1B depicted in the middle, the second electrode of the compensation capacitor C2 is electrically connected to the first electrode of the overlap capacitor C3. The second electrode of the compensation capacitor C2 and the first electrode of the overlap capacitor C3 are electrically connected to each other at a point which can be referred to as a second point P2. Although not illustrated in this drawing, at least one resistor can be provided between the first point P1 and the second point P2, and thus, the voltage at the first point P1 and the voltage at the second point P2 can be different from each other. When there is no resistor between the first point P1 and the second point P2, the first point P1 and the second point P2 can be considered as one point having the same voltage.

[0068] The pixel PX of the display part 100 includes a light emitting diode LED, at least two transistors, and at least one capacitor, and the data driver 130 applies a data voltage to the pixel PX. Depending on example embodiments, three or more transistors and a plurality of voltage sources can be included in one pixel.

[0069] The light emitting diode LED includes a first electrode which is an anode realized as a hole injection electrode, a second electrode which is a cathode realized as an electron injection electrode, and an emission layer arranged between the first electrode and the second electrode. The second electrode is electrically connected with a driving low voltage line to which a driving low voltage Vss is applied, and the first electrode is electrically connected with the first transistor T1.

[0070] The first transistor T1 can be referred to as a driving transistor, and is a transistor that receives a driving voltage Vdd and transmits an output current to a light emitting diode LED according to a voltage of a first gate electrode G1. The first transistor T1 includes the first gate electrode G1, a first active layer A1, a first source electrode S1, and a first drain electrode D1. The first gate electrode G1 is electrically connected with a first electrode of a storage capacitor Cst, and is electrically connected with a second drain electrode D2 of a second transistor T2 which will be described later. The first active layer A1 is disposed to overlap the first gate electrode G1, and the first source electrode S1 and the first drain electrode D1 are electrically connected to opposite ends of the first active layer A1, respectively. The first source electrode S1 is electrically connected with a driving voltage line to which a driving voltage Vdd is applied, and the first drain electrode D1 is electrically connected with an anode of the light emitting diode LED. Here, the first transistor T1 can be a P-type transistor, and outputs an output current when a low voltage is applied to the first gate electrode G1. The first source electrode S1 and the first drain electrode D1 can be interchangeable.

[0071] The second transistor T2 can be referred to as a switching transistor, and is a transistor that transmits a data voltage to the storage capacitor Cst. The second transistor T2 includes a second gate electrode G2, a second active layer A2, a second source electrode S2, and a second drain electrode D2. The second gate electrode G2 is electrically connected to a scan line to which a gate voltage Vg is applied. The second active layer A2 is disposed to overlap the second gate electrode G2, and the second source electrode S2 and the second drain electrode D2 are electrically connected to opposite ends of the second active layer A2, respectively. The second source electrode S2 is electrically connected with a data line to which a data voltage is applied, and the second drain electrode D2 is electrically connected with the first gate electrode G1 of the first transistor T1 and a first electrode of the storage capacitor Cst. Here, the second transistor T2 can be a P-type transistor, and is turned on when a low voltage is applied to the second gate electrode G2. Depending on example embodiments, the first transistor T1 and the second transistor T2 can be provided as N-type transistors.

[0072] The first electrode of the storage capacitor Cst is electrically connected with the second drain electrode D2 and the first gate electrode G1, and a second electrode of the storage capacitor Cst is electrically connected with the driving voltage line and the first source electrode S1. The storage capacitor Cst can store and maintain a voltage transmitted to the first gate electrode G1 of the first transistor T1 through the second transistor T2.

[0073] The first electrode of the overlap capacitor C3 is electrically connected with the sensing portion 20, and the second electrode is electrically connected with the second source electrode S2 of the second transistor T2 and the data voltage source Vdata. Here, the point at which the second electrode of the overlap capacitor C3 is electrically connected with the data voltage source Vdata (i.e., electrically connected at the display portion 100) can be referred to as a third point P3. The data voltage supplied from the data voltage source Vdata can be applied to the second transistor T2 or the like through the third point P3 and the second source electrode S2. The overlap capacitor C3 represents a capacitance generated when the display panel 10 and the sensing portion 20 overlap each other, and in FIG. 1B In the present embodiment, the overlap capacitor C3 is a representative overlap capacitor generated when the wiring of the data line and the common voltage line overlap each other. However, other overlap capacitors can be included. In addition, the overlap capacitor C3 can be one of parasitic capacitors generated when the electrode or wiring of the display panel 10 and the electrode or wiring of the sensing portion 20 overlap each other in the vertical direction or the horizontal direction.

[0074] In FIG. 1B In the present embodiment, each capacitor is electrically connected to a voltage source, and a change in capacitance can occur due to a change in each voltage source.

[0075] Referring to FIG. 2 , (i) represents a waveform of a voltage applied from the first sensing voltage source Vtx, and (ii) represents a waveform of the voltage V1 at the first point P1 that has passed through the cell sensor capacitor C1. (iii) represents a waveform of a voltage applied from the compensation voltage source Vneg_tx, and (iv) represents a waveform of the voltage V2 at the second point P2 that has passed through the compensation capacitor C2. Here, each voltage waveform can mean a signal waveform.

[0076] As shown in (i), when the voltage of the first sensing voltage source Vtx significantly varies, the voltage V1 at the first point P1 can significantly vary. When the voltage of the first sensing voltage source Vtx increases, the voltage at the opposite end of the cell sensor capacitor C1 increases. Accordingly, the voltage of the overlap capacitor C3 increases, and the voltage at the third point P3 increases. On the other hand, as shown in (iii), when the voltage of the compensation voltage source Vneg_tx significantly varies, the voltage V2 at the second point P2 can significantly vary. When the voltage of the compensation voltage source Vneg_tx decreases, the voltage at the opposite end of the compensation capacitor C2 decreases. Accordingly, the voltage of the overlap capacitor C3 decreases, and the voltage at the third point P3 decreases. Accordingly, no voltage variation occurs at the third point P3. That is, at the third point P3, the voltage variation can be insignificant compared to a predetermined voltage variation. The predetermined voltage variation can be a voltage variation at the third point P3 when no signal from the compensation voltage source Vneg_tx is applied. The voltage variation at the third point P3 can be reduced by the signal applied from the compensation voltage source Vneg_tx, but the voltage at the third point P3 can vary depending on the size of each capacitor, and thus, the sensing controller 250 can apply a compensation signal that minimizes the voltage variation due to the first sensing signal tx, taking into account the size of each capacitor.

[0077] Specifically, the sensing controller 250 applies a compensation signal having an inverted phase of a phase of the first sensing signal tx having the first sensing voltage source Vtx to the compensation voltage source Vneg_tx. Accordingly, the voltage V1 that has passed through the cell sensor capacitor C1 and the overlap capacitor C3 is inverted from the voltage V2 that has passed through the compensation capacitor C2 and the overlap capacitor C3 at the third point P3, so that the voltage V1 and the voltage V2 cancel out. Here, when the amplitudes of the first sensing signal tx and the compensation signal are the same, no voltage variation occurs at the third point P3, but when the amplitudes of the first sensing signal tx and the compensation signal are close to each other, a partial voltage variation can occur at the third point P3.

[0078] That is, the noise that can occur when the first sensing signal tx is coupled with the cell sensor capacitor C1 and the overlap capacitor C3 can be attenuated at a first node (node 1) including the third point P3. Accordingly, since insignificant voltage variation occurs in the first node (node 1), the data voltage supplied from the data voltage source Vdata can be directly applied to the pixel circuit. In addition, the noise that can occur when the first sensing signal tx is coupled with the cell sensor capacitor C1 and the overlap capacitor C3 is eliminated at the first node (node 1), so that the data voltage supplied from the data voltage source Vdata can be directly applied to the pixel circuit.

[0079] (v) represents a voltage applied from a data voltage source Vdata, and (vi) represents a gate voltage Vg applied to the second gate electrode G2. A waveform of the voltage V_cst at the storage capacitor Cst according to (v) and (vi) is shown in (vii).

[0080] When a low voltage (i.e., a gate-on voltage) is applied to the second gate electrode G2 in section (a), the second transistor T2 is turned on, and the second source electrode S2 and the second drain electrode D2 of the second transistor T2 are electrically connected. In this case, the data voltage written before section (a) is stored in the storage capacitor Cst through the second transistor T2. In addition, when the same voltage as the voltage applied to the storage capacitor Cst is applied to the first gate electrode G1 and thus a voltage exceeding the threshold voltage (Vth) of the first transistor T1 is applied, the first transistor T1 is turned on. The first transistor T1 sets the intensity of the current output according to the voltage difference between the driving voltage Vdd applied from the first source electrode S1 and the voltage at the first electrode of the storage capacitor Cst.

[0081] Next, because the second transistor T2 is in an off state due to a high voltage in section (b), the current output from the first transistor T1 is transmitted to the light emitting diode LED, and the brightness of the light emitted from the light emitting diode LED is determined according to the intensity of the current. Although the data voltage decreases in section (b), because the second transistor T2 is in the off state, the voltage stored in the storage capacitor Cst is constantly maintained.

[0082] That is, the brightness displayed by the light emitting diode LED is determined according to the intensity of the current flowing through the light emitting diode LED. The current flowing through the light emitting diode LED is the output current of the first transistor T1, and thus, the output current varies according to the voltage of the first gate electrode G1 of the first transistor T1. Therefore, the display device can adjust the brightness of the light emitting diode LED by controlling the voltage of the first gate electrode G1 of the first transistor T1. The voltage of the first gate electrode G1 of the first transistor T1 can be determined by the data voltage, and thus, the display device can adjust the brightness of the light emitting diode LED by adjusting the data voltage.

[0083] Therefore, in the display device according to the example embodiment, noise introduced into the pixel is eliminated, and thus, it is possible to prevent the brightness of the light emitting diode from varying according to the operation of the sensing electrode.

[0084] Hereinafter, a sensing portion including a sensing electrode will be described with reference to FIG. 3A , FIG. 3B , FIG. 4A and FIG. 4B .

[0085] FIG. 3A is a schematic layout view of a sensing electrode according to an exemplary embodiment, FIG. 3B is a schematic top plan view of a sensing electrode according to an exemplary embodiment, FIG. 4A is FIG. 3B is a sectional view taken along line III-III' of FIG. 4B is FIG. 3B is a sectional view taken along line IV-IV' of

[0086] Referring to FIG. 3A and FIG. 3B , the sensing part 20 includes a plurality of sensing electrodes and a plurality of compensation electrodes 230, and the plurality of sensing electrodes includes a plurality of first sensing electrodes 210 and a plurality of second sensing electrodes 220. In FIG. 3A , two second sensing electrodes 220 arranged at both sides of the first sensing electrode 210 are illustrated with RXi and RXj because they can be electrically connected to different sensing lines.

[0087] A first sensing signal tx varying in correspondence to an external input can be applied to the first sensing electrode 210. A compensation signal neg_tx for compensating noise according to the first sensing signal tx can be applied to the compensation electrode 230. The first sensing electrode 210 is a sensing input (Tx) electrode, and the second sensing electrode 220 can be a sensing output (Rx) electrode. Also, the first sensing electrode 210 can be a sensing output (Rx) electrode, and the second sensing electrode 220 can be a sensing input (Tx) electrode.

[0088] Referring to FIG. 3A , the first sensing electrode 210 is arranged between two second sensing electrodes 220 while having a distance between the first sensing electrode 210 and the two second sensing electrodes 220. A single compensation electrode 230 is arranged to be spaced apart from a single first sensing electrode 210 and arranged within the single first sensing electrode 210. That is, an edge of the compensation electrode 230 is surrounded by the first sensing electrode 210.

[0089] The compensation electrode 230 can not be arranged between the first sensing electrode 210 and the second sensing electrode 220, and can be arranged only between the plurality of first sensing electrodes 210 while being spaced apart from the first sensing electrode 210. The compensation electrode 230 can be positioned as far as possible from the second sensing electrode 220.

[0090] Referring to FIG. 3B , the sensing part 20 includes a touch area TA in which a plurality of sensing electrodes are arranged, and a peripheral area PA surrounding the touch area TA.

[0091] The touch area TA includes a plurality of sensing electrodes and a plurality of compensation electrodes 230, and the plurality of sensing electrodes includes a plurality of first sensing electrodes 210 and a plurality of second sensing electrodes 220.

[0092] The plurality of first sensing electrodes 210 and the plurality of second sensing electrodes 220 are dispersed and thus arranged in a grid format so that they do not overlap each other. The plurality of first sensing electrodes 210 is arranged in a plurality along the second direction y or the first direction x, and the plurality of second sensing electrodes 220 is arranged in a plurality along the second direction y or the first direction x.

[0093] The plurality of first sensing electrodes 210 arranged in each column is electrically connected to each other through a first connector 211, and the plurality of second sensing electrodes 220 arranged in each row is electrically connected to each other through a second connector 221.

[0094] The plurality of compensation electrodes 230 is respectively arranged to be spaced apart from and within the plurality of first sensing electrodes 210, and is arranged to be parallel to the second direction y and the first direction x, respectively. The plurality of compensation electrodes 230 is arranged in the first direction x that crosses the second direction y in which the plurality of first sensing electrodes 210 is arranged. Depending on an exemplary embodiment, the plurality of compensation electrodes 230 can be arranged in a direction parallel to the direction in which the plurality of first sensing electrodes 210 is arranged. The arrangement direction of the sensing wires 240 can vary according to the arrangement direction of the plurality of compensation electrodes 230.

[0095] The plurality of sensing electrodes and the plurality of compensation electrodes 230 are illustrated in a diamond shape, but this is not limiting. For example, the shape can be a polygon such as a quadrilateral and a hexagon, or an ellipse, and can be implemented in various shapes, for example, with a protruding portion to improve the sensitivity of the sensor.

[0096] The plurality of sensing wires 240 electrically connected to the plurality of sensing electrodes and the plurality of compensation electrodes 230 is arranged in the peripheral area PA. The plurality of compensation electrodes 230 arranged in the same first direction x can be electrically connected by the plurality of sensing wires 240 extending in the first direction x. Although in the embodiment of the present disclosure, the plurality of sensing wires 240 is arranged in the peripheral area PA, the present disclosure is not limited thereto. For example, the plurality of sensing wires 240 can be arranged in the touch area TA. FIG. 3BThe plurality of sensing wirings 240 can be electrically connected to a pad portion (not shown) of the display device, although not shown. In this case, the plurality of sensing wirings 240 can be directly and electrically connected to the pad portion, respectively, or some of the sensing wirings 240 are electrically connected to each other and then electrically connected to the pad portion through a single wiring. The plurality of sensing wirings 240 are disposed in a layer different from that of the pad portion, and thus can be electrically connected to the pad portion through an opening of an insulating layer disposed between the plurality of sensing wirings 240 and the pad portion. In addition, the plurality of sensing wirings 240 can be continuously formed of the same material as the plurality of first sensing electrodes 210 and the plurality of second sensing electrodes 220. That is, a portion extending partially from the plurality of first sensing electrodes 210 and the plurality of second sensing electrodes 220 can be implemented as the plurality of sensing wirings 240.

[0097] The compensation signal can be applied to the plurality of sensing wirings (compensation channel i+3, compensation channel i+4, bundle compensation channel) electrically connected to the plurality of compensation electrodes 230. The plurality of sensing wirings TXn, TXn+1, TXn+2, and TXn+3 electrically connected to the plurality of first sensing electrodes 210 can be applied with the first sensing signal tx. In addition, the plurality of sensing wirings RXm, RXm+1, RXm+2, RXm+3, RXm+4, RXm+5, RXm+6, and RXm+7 electrically connected to the plurality of second sensing electrodes 220 can be applied with the second sensing signal rx.

[0098] The first sensing electrodes 210 and the second sensing electrodes 220 are disposed on the same layer, but can be disposed on different layers. In addition, the compensation electrodes 230 can be located on the same layer as the first sensing electrodes 210, or can be located on different layers.

[0099] Referring to FIG. 4A The sensing portion 20 is located on one side of the display portion 100 while overlapping the display portion 100. A single or a plurality of insulating layers 150 are disposed between the sensing portion 20 and the display portion 100. A window 300 can be disposed on the sensing portion 20.

[0100] In the sensing portion 20, two first sensing electrodes 210 are located on the same layer as the compensation electrode 230. A single compensation electrode 230 is disposed to be spaced apart from the two adjacent first sensing electrodes 210.

[0101] That is, the compensation electrode 230 is located only between the first sensing electrodes 210 and is disposed to be as far as possible from the second sensing electrode 220, and thus can not affect the capacitance formed between the first sensing electrodes 210 and the second sensing electrode 220. That is, the driving of the sensing portion 20 is not affected.

[0102] Referring to FIG. 4BIn the sensing part 20, the compensation electrode 230 is arranged on a different layer from the first sensing electrode 210. The compensation electrode 230 can be arranged so as not to overlap the first sensing electrode 210, while an insulating layer 150 is arranged between the compensation electrode 230 and the first sensing electrode 210.

[0103] That is, the compensation electrode 230 is arranged between two first sensing electrodes 210, and opposite ends of the compensation electrode 230 can be arranged so as to be spaced apart from the first sensing electrode 210 so as not to overlap either end of the first sensing electrode 210 in the vertical direction.

[0104] Since the compensation electrode 230 is arranged only between adjacent first sensing electrodes 210 in FIG. 4B , the compensation electrode 230 is arranged as far as possible from the second sensing electrode 220 so that the compensation electrode 230 can not affect the capacitance formed between the first sensing electrode 210 and the second sensing electrode 220.

[0105] Hereinafter, with reference to FIG. 5 , a display device including a sensing part that can reduce power consumption more than the display device described above will be described.

[0106] FIG. 5 is a waveform diagram of a voltage applied to a display device according to an example embodiment. With reference to the circuit diagram of FIG. 1B and the waveform diagram of FIG. 2 , the waveform diagram of FIG. 5 will be described.

[0107] (i) is a waveform of a voltage applied from the first sensing voltage source Vtx, and (iii) is a waveform of a voltage applied from the compensation voltage source Vneg_tx. Accordingly, the voltage V1 passing through the cell sensor capacitor C1 can have a waveform as shown in (ii), and the voltage V2 passing through the compensation capacitor C2 can have a waveform as shown in (iv). The voltage applied from the data voltage source Vdata has a waveform as shown in (v), and the gate voltage Vg applied to the second gate electrode G2 has a waveform of (vi). Accordingly, the voltage V_cst of the storage capacitor Cst has a waveform of (vii).

[0108] With reference to (i) and (iii) of FIG. 2 , the first sensing voltage source Vtx and the compensation voltage source Vneg_tx start to apply a voltage with the same timing.

[0109] On the other hand, with reference to FIG. 5In (i) and (iii), the first sensing voltage source Vtx applies a signal at a first time t1, but the compensation voltage source Vneg_tx applies a signal at a second time t2. The signals applied from the compensation voltage source Vneg_tx and the first sensing voltage source Vtx have different time points, but their phases are opposite to each other, while their amplitudes are substantially equal or similar.

[0110] Reference FIG. 5 In (ii) and (iv), in section (a), the voltage V1 passing through the unit sensor capacitor C1 can have a phase opposite to that of the voltage V2 passing through the compensation capacitor C2, and the amplitudes of voltages V1 and V2 can be the same. Therefore, in FIG. 1B No voltage change occurred in the first node (node ​​1).

[0111] When a low voltage is applied to the second gate electrode G2 in section (a), the second transistor T2 turns on and transmits the data voltage. A constant voltage is applied to the first electrode and the first gate electrode G1 of the storage capacitor Cst, and therefore the first transistor T1 turns on.

[0112] Next, in section (b), the second transistor T2 is in the off state due to the high voltage, and therefore the current output from the first transistor T1 is transferred to the light-emitting diode (LED), and the brightness of the light emitted from the LED is determined according to the intensity of the current. Although the data voltage decreases in section (b), the voltage stored in the storage capacitor Cst is maintained constant because the second transistor T2 is in the off state.

[0113] That is, although the first sensing signal tx and the compensation signal have different application timings, the intensity of the current flowing to the light-emitting diode (LED) and the brightness of the LED are almost unaffected. Furthermore, in section (a'), no compensation signal neg_tx is applied, and therefore, in the display device, power consumption caused by the compensation voltage source Vneg_tx in section (a') can be prevented. Therefore, compared with... FIG. 2 Compared to the power consumption of the waveform shown, when based on FIG. 5 When the waveform shown is subjected to voltage, power consumption can be saved.

[0114] In the following text, refer to FIG. 6A and FIG. 6B This will describe the controller that controls the display panel and the sensing components.

[0115] FIG. 6A and FIG. 6B This is a block diagram used to describe the voltage applied to a display device according to an example embodiment.

[0116] Reference FIG. 6A andFIG. 6B The display panel 10 includes a display controller 110, a gate driver 120, and a data driver 130 for driving the display section 100. The sensing section 20 includes a plurality of sensing electrodes 200 and a sensing controller 250 for driving the plurality of sensing electrodes 200.

[0117] The display controller 110 receives image data and synchronization signals from an external source (not shown) and transmits the received data and signals to the gate driver 120 and the data driver 130. The gate driver 120 receives the gate drive control signal and generates a gate signal, which can be applied to the display section 100 via a gate line. The data driver 130 receives the data drive control signal and generates a data signal, which can be applied to the display section 100 via a data line.

[0118] The sensing electrode 200 may include the above reference. FIG. 3A to FIG. 4B The description includes a plurality of first sensing electrodes 210, a plurality of second sensing electrodes 220, and a plurality of compensation electrodes 230. Additionally, the sensing electrode 200 may include at least a portion of sensing wiring 240 electrically connected to the plurality of first sensing electrodes 210, the plurality of second sensing electrodes 220, and the plurality of compensation electrodes 230.

[0119] The sensing controller 250 applies control signals to a plurality of sensing electrodes 200. In this case, the control signals include a first touch control signal for driving a first sensing electrode 210 and a second touch control signal for driving a second sensing electrode 220. FIG. 6A and FIG. 6B In the figure, Vtx can refer to the first touch control signal and Vrx can refer to the second touch control signal, but they can also correspond to the first sensing signal tx and the second sensing signal rx, and therefore use the same reference numerals.

[0120] Reference FIG. 6A The sensing controller 250 further applies a compensation signal, neg_tx, to the plurality of sensing electrodes 200 to drive the compensation electrode 230. FIG. 6A In this diagram, Vneg_tx corresponds to the compensation control signal, but it can also correspond to the compensation signal neg_tx, and therefore the same reference numerals are used.

[0121] The compensation signal neg_tx and the first sensing signal tx are out of phase with each other, and their amplitudes are the same or similar.

[0122] The sensing controller 250 can directly generate a compensation signal neg_tx corresponding to the first sensing signal tx, and therefore can easily synchronize the compensation signal neg_tx.

[0123] ReferenceFIG. 6B The display controller 110 transmits a synchronization signal sync to the sensing controller 250. The synchronization signal sync is related to the timing of driving the pixel PX according to the scan signal applied to the second gate electrode G2 of the second transistor T2 and the data voltage applied to the second source electrode S2. The sensing controller 250 receives the synchronization signal sync from the display controller 110 and generates a compensation signal neg_tx.

[0124] The compensation signal neg_tx generated by the sensing controller 250 may have a phase opposite to that of the first sensing signal tx, and may have the same or similar amplitude. However, the sensing controller 250 synchronizes the timing according to the application of the gate signal in order to control the application timing of the compensation signal neg_tx and the application timing of the first sensing signal tx. FIG. 6B The sensing controller 250 shown can apply a signal with... FIG. 5 The voltage of a waveform similar to the one shown. (See reference...) FIG. 5 As described, the display device according to this example embodiment can reduce the power consumption of the sensing portion 20.

[0125] The compensation signal neg_tx generated by the sensing controller 250 can be applied to the compensation electrode 230. Therefore, although noise is generated due to the coupling of the first sensing signal tx, the noise introduced into the data line can be eliminated by the compensation signal neg_tx, and thus, the display device according to this example embodiment can prevent the brightness of the light-emitting diode (LED) from changing according to the operation of the sensing electrode.

[0126] In the following text, reference will be made to FIG. 7 , FIG. 8 , FIG. 9A , FIG. 9B , FIG. 9C and FIG. 10 Various example embodiments of the sensing electrodes are described.

[0127] FIG. 7 This is a top plan view of the sensing electrodes according to an example embodiment. FIG. 8 yes FIG. 7 A cross-sectional view taken along line VIII-VIII'. FIG. 9A , FIG. 9B and FIG. 9C This is a schematic layout diagram of the sensing electrodes according to an example embodiment, and FIG. 10 This is a top plan view of the sensing electrodes according to an example embodiment.

[0128] Reference FIG. 7 and FIG. 8The sensing part 20 includes a plurality of sensing electrodes and a plurality of compensation electrodes 230, and the plurality of sensing electrodes includes a plurality of first sensing electrodes 210 and a plurality of second sensing electrodes 220. FIG. 7 and FIG. 8 Similar to FIG. 3B , FIG. 4A and FIG. 4B Therefore, the differences will be described primarily below.

[0129] Multiple compensation electrodes 230 overlap with and are disposed inside multiple first sensing electrodes 210. In the cross-sectional view, the compensation electrodes 230 overlap with the first sensing electrodes 210, but are disposed on different layers from the first sensing electrodes 210. The second sensing electrode 220 may be disposed on the same layer as the first sensing electrodes 210, or it may be disposed on a different layer. The compensation electrodes 230 may be formed to be smaller than the first sensing electrodes 210.

[0130] Multiple compensation electrodes 230 disposed in the same second direction y can be electrically connected by multiple sensing wires 240 extending in the second direction y. In this case, each of the compensation electrodes 230 can be applied a compensation signal neg_tx. Here, the compensation signal neg_tx is a signal with the same or similar intensity as the first sensing signal tx applied to the first sensing electrode 210 but with a different phase.

[0131] The compensation electrode 230 is arranged further away from the second sensing electrode 220 than the first sensing electrode 210, and therefore, the compensation electrode 230 does not affect the capacitance formed between the first sensing electrode 210 and the second sensing electrode 220. That is, the driving of the sensing section 20 is not affected.

[0132] Reference FIG. 9A and FIG. 9B The sensing part 20 includes a plurality of sensing electrodes and a plurality of compensation electrodes 230, and the plurality of sensing electrodes includes a plurality of first sensing electrodes 210 and a plurality of second sensing electrodes 220. FIG. 9A Similar to FIG. 3A And will only describe the differences in detail.

[0133] Reference FIG. 9A Two first sensing electrodes 210 are arranged between two second sensing electrodes 220, and a compensation electrode 230 is arranged between the two first sensing electrodes 210. In this case, the left first sensing electrode 210 (TXn) and the right first sensing electrode 210 (TXm) are connected by different sensing wiring 240 relative to the compensation electrode 230. FIG. 9A (Not shown in the image) Electrical connection, and therefore can receive different signals.

[0134] ReferenceFIG. 9B Two first sensing electrodes 210 are arranged between two second sensing electrodes 220, and a compensation electrode 230 is arranged between the two first sensing electrodes 210. In this case, the left first sensing electrode 210 (TXn) and the right first sensing electrode 210 (TXn) can be connected via the same sensing wiring 240 with respect to the compensation electrode 230. FIG. 9B (Not shown in the image) Electrical connection, and therefore can receive the same signal.

[0135] Reference FIG. 9C A compensation electrode 230 is disposed on one side of the first sensing electrode 210, and a ground power supply GND and multiple sensing wires 240 are disposed between the compensation electrode 230 and the first sensing electrode 210. A second sensing electrode 220 is disposed on the other side of the first sensing electrode 210. FIG. 9C The figure shows a first sensing electrode 210 and a second sensing electrode 220. However, another first sensing electrode 210 may be arranged to the left of multiple sensing wires 240 arranged to the left of the compensation electrode 230, and another second sensing electrode 220 may be arranged to the left of the other first sensing electrode 210.

[0136] That is, the compensation electrode 230 is arranged only between the first sensing electrodes 210 and is arranged as far away from the second sensing electrode 220 as possible, so that the compensation electrode 230 does not affect the capacitance formed between the first sensing electrode 210 and the second sensing electrode 220.

[0137] Reference FIG. 10 A plurality of first sensing electrodes 210 are provided in the second direction y, and at least two second sensing electrodes 220 are provided in the second direction y.

[0138] A plurality of first sensing electrodes 210 are arranged in a second direction y between at least two second sensing electrodes 220, and compensation electrodes 230 are arranged in the second direction y between adjacent first sensing electrodes 210. A compensation electrode 230 is spaced apart between two first sensing electrodes 210 arranged in the first row, and another compensation electrode 230 is spaced apart between four first sensing electrodes 210 arranged in the second and third rows. The compensation electrodes 230 are spaced apart between the first sensing electrodes 210, and the shape and size of the compensation electrodes 230 can be implemented in various ways.

[0139] Multiple sensing wires 240 electrically connected to multiple first sensing electrodes 210 are arranged between the first sensing electrodes 210 and the second sensing electrodes 220. The multiple sensing wires 240 extend in the second direction y, and even when... FIG. 10Not shown in the figure, but multiple sensing wires 240 can be electrically connected to multiple second sensing electrodes 220 and multiple compensation electrodes 230 respectively.

[0140] Multiple sensing wires 240 electrically connected to multiple compensation electrodes 230 can be subjected to a compensation voltage. Multiple first sensing electrodes 210 electrically connected to multiple sensing wires 240 can be subjected to a first sensing signal tx.

[0141] In the example embodiment, the compensation electrode 230 is arranged only between the first sensing electrodes 210 and is arranged as far away from the second sensing electrode 220 as possible, and therefore, the compensation electrode 230 may not affect the capacitance formed between the first sensing electrode 210 and the second sensing electrode 220.

[0142] In the following text, reference will be made to FIG. 11 and FIG. 12 The description includes a display device with compensated voltage lines.

[0143] FIG. 11 This is a circuit diagram of a display device according to an example embodiment, and FIG. 12 Is FIG. 11 The example embodiment shown depicts a waveform of the voltage applied to the display device. Because... FIG. 11 Circuit diagram and FIG. 12 The waveform is similar to the reference. FIG. 1B and FIG. 2 The circuit diagrams and waveforms described will be used to illustrate the differences.

[0144] Reference FIG. 11 The display device includes a display portion 100 comprising a plurality of pixels PX.

[0145] Despite FIG. 11 The sensing section 20 is not shown in the figure, but the display section 100 and the sensing section 20 can be electrically connected to each other via the overlapping capacitor C3. Noise caused by the operation of the sensing section 20 can be transmitted to the display section 100 via the overlapping capacitor C3.

[0146] The display section 100 includes a gate line 151, a data line 171, a compensation voltage line 131, and a plurality of pixels PX, and each pixel PX includes a light-emitting diode (LED), two transistors, and a storage capacitor Cst. Here, the two transistors can be referred to as the first transistor T1 and the second transistor T2, respectively.

[0147] like FIG. 11As depicted, gate line 151 may extend in a first direction x, and data line 171 may extend in a second direction y perpendicular to the first direction x. Compensation voltage line 131 may extend in the first direction x parallel to gate line 151 and may be arranged in a direction perpendicular to data line 171. A scan signal Sn (see [reference needed]) is applied to gate line 151. FIG. 16 ), and therefore can be called scan lines.

[0148] The second gate electrode of the second transistor T2 is electrically connected to gate line 151, and the second source electrode of the second transistor T2 is electrically connected to data line 171. The point where the second source electrode and data line 171 are electrically connected can be referred to as the first node (node ​​1). Data line 171 and compensation voltage line 131 are electrically connected to each other at the first node (node ​​1). In addition, one electrode of the overlapping capacitor C3 is electrically connected to the first node (node ​​1).

[0149] Parasitic capacitor C5 is formed between compensation voltage line 131 and data line 171. Therefore, no additional capacitor is needed between compensation voltage line 131 and data line 171.

[0150] Depending on the example embodiment, the display device may not include a separate compensation voltage line 131, and the compensation signal may be applied even when no light emission control signal and initialization signal applied in the first direction x are written. Furthermore, because the noise caused by the sensing portion 20 is very small, it is not necessary to provide a compensation voltage line 131 in each pixel, and the number and position of the compensation voltage lines 131 can be modified in various ways.

[0151] Reference FIG. 12 (i) is the waveform of the voltage applied from the sensing section 20, (ii) is the waveform of the voltage V1 at the first node (node ​​1), and (iv') is the waveform of the voltage V2 applied from the compensation voltage line 131. When a gate voltage Vg with waveform (vi) is applied from the gate line 151, a voltage with waveform (v') is applied from the data line 171, and the voltage V_cst at the storage capacitor Cst has waveform (vii).

[0152] As shown in (i), when the voltage changes abruptly in the sensing section 20, the voltage of the overlapping capacitor C3 may change abruptly. That is, when the voltage increases in the sensing section 20, the voltage at the opposite ends of the overlapping capacitor C3 increases, and the voltage at the first node (node ​​1) also increases. In this case, when a signal such as (iv') is applied from the compensation voltage line 131, the voltage increase at the first node (node ​​1) decreases. Therefore, no voltage change or almost no voltage change occurs at the first node (node ​​1). When the strength of the compensation signal applied to the compensation voltage line 131 is the same as the strength of the signal transmitted from the sensing section 20, no voltage change occurs at the first node (node ​​1); however, when the strength of the compensation signal applied to the compensation voltage line 131 is similar to the strength of the signal transmitted from the sensing section 20, the voltage at the first node (node ​​1) may change partially.

[0153] That is, noise transmitted along with voltage coupling at sensing section 20 can be eliminated in the first node (node ​​1). Therefore, the data voltage supplied from data line 171 can be directly applied to the second transistor T2, and the first transistor T1 can control the brightness of the light-emitting diode LED according to the data voltage.

[0154] Therefore, the display device according to the example embodiment can prevent the brightness of the light-emitting diode from changing according to the operation of the sensing electrode by eliminating noise introduced into the pixel.

[0155] Despite FIG. 12 Not shown in the figure, but the voltage applied from the compensation voltage line can be adjusted according to the application timing of the gate signal, as previously stated in FIG. 5 As described in [the document], the compensation signal is delayed and applied according to the time of application of the gate signal, allowing the display device to reduce the power consumption required by the sensing section.

[0156] In the following text, reference will be made to FIG. 13A and FIG. 13B Describes the controller that controls the display panel and sensing components.

[0157] FIG. 13A and FIG. 13B This is a block diagram provided according to an example embodiment to describe the voltage applied to a display device. Because... FIG. 13A and FIG. 13B and FIG. 6A and FIG. 6B Because of the similarities, the description will focus on the differences.

[0158] Reference FIG. 13A and FIG. 13BThe display panel 10 includes a display controller 110, a gate driver 120, and a data driver 130 for driving the display section 100. The sensing section 20 includes a plurality of sensing electrodes 200 and a sensing controller 250 for driving the plurality of sensing electrodes 200.

[0159] Reference FIG. 13A The sensing controller 250 applies control signals to a plurality of sensing electrodes 200. In this case, the control signals include a first sensing signal tx for driving a first sensing electrode and a second sensing signal rx for driving a second sensing electrode. Here, the first sensing signal tx may be a signal for controlling a first sensing voltage source Vtx, and the second sensing signal rx may be a signal for controlling a second sensing voltage source Vrx.

[0160] Additionally, the sensing controller 250 applies a synchronization signal sync corresponding to the first sensing signal tx to the display controller 110. The display controller 110 generates a compensation signal neg_tx corresponding to the synchronization signal sync, and can apply a control signal capable of generating the compensation signal neg_tx to the gate driver 120. Therefore, the gate driver 120 can apply the compensation signal neg_tx to the display section 100, and the display section 100 can directly transmit the compensation signal neg_tx via the compensation voltage line. This can be seen in reference... FIG. 11 Determined in the described display device.

[0161] Reference FIG. 13B The display device includes a display controller 110, a sensing controller 250, and a third circuit section 180.

[0162] The display controller 110 transmits a synchronization signal sync to the third circuit section 180. The synchronization signal sync is related to the timing of driving the pixel PX, which can be based on the scan signal applied to the second gate electrode G2 of the second transistor T2 and the data voltage applied to the second source electrode S2. Here, the display controller 110 can apply a data voltage with the same characteristics as the second gate electrode G2 of the second transistor T2. FIG. 5 The voltage is a waveform similar to the one shown.

[0163] The sensing controller 250 transmits a synchronization signal sync corresponding to the first sensing signal tx to the third circuit section 180. The synchronization signal sync has a phase out of phase with respect to the first sensing signal tx and may include information for generating a compensation signal with the same or similar intensity.

[0164] The third circuit section 180 receives synchronization signals sync from the display controller 110 and the sensing controller 250, respectively, generates a compensation signal neg_tx, and applies the compensation signal neg_tx to the sensing electrode 200. The compensation signal neg_tx is a signal that can eliminate noise generated from the first sensing signal tx. Therefore, even when noise is generated due to the coupling of the first sensing signal tx, the noise introduced into the data lines of the display section 100 can be eliminated by the compensation signal neg_tx, and thus, the display device according to the example embodiment can prevent the brightness of the light-emitting diode from changing according to the operation of the sensing electrode.

[0165] In the following text, reference will be made to FIG. 14 and FIG. 15 Describe the effects of the display device according to the example embodiment.

[0166] FIG. 14 The figure shows a graph illustrating voltage changes in a display device according to an example embodiment, and FIG. 15 This is a graph showing the voltage change in a display device according to a comparative example. (Refer to...) FIG. 1B and FIG. 2 To describe FIG. 14 and FIG. 15 .

[0167] Reference FIG. 14 The compensation signal neg_tx applied to the display device according to the example embodiment may be the same or similar in intensity to the first sensing signal tx, while having an out-of-phase phase. The common voltage Vcom remains almost constant without change. (Return to reference) FIG. 1B As the noise is eliminated in the first node (node ​​1), the common voltage Vcom remains almost constant without change. It is not possible to completely eliminate the noise in the first node (node ​​1), and even if the noise is not completely eliminated, the common voltage Vcom in the display device according to the example embodiment remains constant. FIG. 15 Compared to the common voltage Vcom in the comparison example, a relatively constant voltage can also be maintained.

[0168] Depends on what is applied FIG. 1B The data voltage of the second transistor T2 in the LED can cause it to light up, and the voltage change at the storage capacitor Cst is negligible, depending on the data voltage.

[0169] Therefore, it can be determined that the voltage variation at the storage capacitor Cst is approximately ±0.1%, and the maximum is approximately -0.3%.

[0170] That is, in the display device according to the example embodiment, noise that may occur due to the coupling of the first sensing signal tx can be eliminated, and therefore, the brightness change of the light-emitting diode according to the operation of the sensing electrode can be prevented.

[0171] Reference FIG. 15 In the display device according to the comparison example, no compensation signal neg_tx is applied, and only the first sensing signal tx exists.

[0172] When the first sensing signal tx changes, noise is transmitted to the first node (node ​​1), and therefore the common voltage Vcom changes. This noise-inclusive common voltage Vcom is applied to the pixel, and thus, the voltage of the storage capacitor Cst changes by up to approximately +2.5%.

[0173] That is, in the comparative example, a signal capable of eliminating noise that may occur due to coupling with the first sensing signal tx is not included, and therefore, a significant voltage change occurs at the storage capacitor Cst. Consequently, a brightness change may occur in the light-emitting diode of the display device according to the comparative example.

[0174] In the following text, refer to FIG. 16 The following describes a display device according to an example embodiment.

[0175] FIG. 16 This is an equivalent circuit diagram of the pixels of a display device according to an example embodiment. FIG. 16 The pixels shown in the figure can be implemented as FIG. 1A The pixel PX. Here, the display device can be an organic light-emitting display.

[0176] Reference FIG. 16 The pixel PX of the organic light-emitting display includes multiple transistors T1, T2, T3, T4, T5, T6 and T7 electrically connected to multiple signal lines 127, 151, 152, 153, 158, 171, 172 and 741, a storage capacitor Cst, and an organic light-emitting diode OLED.

[0177] Organic light-emitting displays include a display area for displaying images, and pixels (PX) are set in the display area in various formats.

[0178] The plurality of transistors T1, T2, T3, T4, T5, T6, and T7 include a driving transistor T1 and switching transistors electrically connected to the scan line, namely, the second transistor T2 and the third transistor T3, and other transistors used for the operation of the organic light-emitting diode (OLED) are referred to as transistors necessary for the operation of the OLED (hereinafter referred to as compensation transistors). Compensation transistors T4, T5, T6, and T7 may include a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, and a seventh transistor T7. The plurality of signal lines 127, 151, 152, 153, 158, 171, 172, and 741 may include a scan line 151, a pre-stage scan line 152, a light-emitting control line 153, a bypass control line 158, a data line 171, a driving voltage line 172, an initialization voltage line 127, and a common voltage line 741. The bypass control line 158 may be part of the pre-stage scan line 152, or may be electrically connected to the pre-stage scan line 152.

[0179] Scan line 151 is electrically connected to the gate driver (not shown) and thus transmits the scan signal Sn to the second transistor T2 and the third transistor T3. Front-stage scan line 152 is electrically connected to the gate driver and transmits the front-stage scan signal Sn-1, applied to the pixel PX located in the front stage, to the fourth transistor T4. Emission control line 153 is electrically connected to the emission controller (not shown) and transmits the emission control signal EM, which controls the emission time of the organic light-emitting diode (OLED), to the fifth transistor T5 and the sixth transistor T6. Bypass control line 158 transmits the bypass signal GB to the seventh transistor T7.

[0180] Data line 171 is a wiring that transmits the data voltage Dm generated by a data driver (not shown), and the brightness of the organic light-emitting diode (OLED) (also known as an organic light-emitting element) varies according to the data voltage Dm. Drive voltage line 172 applies a drive voltage ELVDD, initialization voltage line 127 transmits the initialization voltage Vint that initializes the drive transistor T1, and common voltage line 741 applies a drive low voltage ELVSS. Drive voltage line 172, initialization voltage line 127, and common voltage line 741 can each be applied with a constant voltage.

[0181] Reference FIG. 16 The gate electrode G1 of the driving transistor T1 and the second electrode D3 of the third transistor T3 are electrically connected to each other through the driving gate node Q.

[0182] The driving transistor T1 controls the intensity of its output current based on the data voltage Dm applied to it, and the output driving current Id is applied to the organic light-emitting diode (OLED) to adjust the brightness of the OLED according to the data voltage Dm. For this purpose, the first electrode S1 of the driving transistor T1 is arranged to receive the driving voltage ELVDD and is electrically connected to the driving voltage line 172 via the fifth transistor T5. Additionally, the first electrode S1 of the driving transistor T1 is electrically connected to the second electrode D2 of the second transistor T2 and thus receives the data voltage Dm. The second electrode D1 of the driving transistor T1 (the electrode on the output side) is arranged to output current to the OLED and is thus electrically connected to the anode of the OLED via the sixth transistor T6. Simultaneously, the gate electrode G1 is electrically connected to one electrode of the storage capacitor Cst (i.e., the second storage electrode E2). Therefore, the voltage of the gate electrode G1 varies according to the voltage stored in the storage capacitor Cst, and thus, the driving current Id output from the driving transistor T1 varies.

[0183] The second transistor T2 is the transistor in pixel PX that receives the data voltage Dm. Its gate electrode G2 is electrically connected to scan line 151, and its first electrode S2 is electrically connected to data line 171. The second electrode D2 of the second transistor T2 is electrically connected to the first electrode S1 of the driving transistor T1. When the second transistor T2 is turned on according to the scan signal Sn transmitted through scan line 151, the data voltage Dm transmitted through data line 171 is transmitted to the first electrode S1 of the driving transistor T1.

[0184] The third transistor T3 is a transistor that enables the compensation voltage (i.e., the voltage of Dm+Vth) that varies from the data voltage Dm through the driving transistor T1 to be transmitted to the second storage electrode E2 of the storage capacitor Cst. The gate electrode G3 is electrically connected to the scan line 151, and the first electrode S3 is electrically connected to the second electrode D1 of the driving transistor T1. The second electrode D3 of the third transistor T3 is electrically connected to the second storage electrode E2 of the storage capacitor Cst and the gate electrode G1 of the driving transistor T1.

[0185] The third transistor T3 is turned on according to the scan signal Sn transmitted through the scan line 151, and the gate electrode G1 of the driving transistor T1 is electrically connected to the second electrode D1, and the second electrode D1 of the driving transistor T1 is electrically connected to the second storage electrode E2 of the storage capacitor Cst.

[0186] The fourth transistor T4 initializes the gate electrode G1 of the driving transistor T1 and the second storage electrode E2 of the storage capacitor Cst. The gate electrode G4 is electrically connected to the preceding scan line 152, and the first electrode S4 is electrically connected to the initialization voltage line 127. The second electrode D4 of the fourth transistor T4 is electrically connected to the second storage electrode E2 of the storage capacitor Cst and the gate electrode G1 of the driving transistor T1 via the second electrode D3 of the third transistor T3. The fourth transistor T4 transmits the initialization voltage Vint to the gate electrode G1 of the driving transistor T1 and the second storage electrode E2 of the storage capacitor Cst according to the preceding scan signal Sn-1 of the preceding scan line 152. Therefore, the gate voltage of the gate electrode G1 of the driving transistor T1 and the storage capacitor Cst are initialized. The initialization voltage Vint can be the voltage that allows the driving transistor T1 to conduct by having a low voltage value.

[0187] The fifth transistor T5 is used to transmit the driving voltage ELVDD to the driving transistor T1. The gate electrode G5 is electrically connected to the light-emitting control line 153, and the first electrode S5 is electrically connected to the driving voltage line 172. The second electrode D5 of the fifth transistor T5 is electrically connected to the first electrode S1 of the driving transistor T1.

[0188] The sixth transistor T6 is used to transfer the drive current Id output from the driving transistor T1 to the organic light-emitting diode (OLED). The gate electrode G6 is electrically connected to the light-emitting control line 153, and the first electrode S6 is electrically connected to the second electrode D1 of the driving transistor T1. The second electrode D6 of the sixth transistor T6 is electrically connected to the anode of the OLED.

[0189] The fifth transistor T5 and the sixth transistor T6 are simultaneously turned on by the light-emitting control signal EM transmitted via the light-emitting control line 153. When the driving voltage ELVDD is applied to the first electrode S1 of the driving transistor T1 through the fifth transistor T5, the driving transistor T1 outputs a driving current Id according to the voltage of the gate electrode G1 of the driving transistor T1 (i.e., the voltage of the second storage electrode E2 of the storage capacitor Cst). The output driving current Id is transmitted through the sixth transistor T6, a portion of which is transmitted to the organic light-emitting diode OLED as the OLED current Ioled, and another portion is transmitted to the seventh transistor T7 as the bypass current Ibp. As the OLED current Ioled flows to the organic light-emitting diode OLED, the organic light-emitting diode OLED emits light.

[0190] The seventh transistor T7 is used to initialize the anode of the organic light-emitting diode (OLED). The gate electrode G7 is electrically connected to the bypass control line 158, the first electrode S7 is electrically connected to the anode of the OLED, and the second electrode D7 is electrically connected to the initialization voltage line 127. The bypass control line 158 can be electrically connected to the preceding scan line 152, and a bypass signal GB is applied with the same timing as the preceding scan signal Sn-1. Alternatively, the bypass control line 158 can transmit a different signal than the preceding scan signal Sn-1, instead of being electrically connected to the preceding scan line 152. When the seventh transistor T7 is turned on according to the bypass signal GB, the initialization voltage Vint is applied to the anode of the OLED, and thus the OLED is initialized.

[0191] The first storage electrode E1 of the storage capacitor Cst is electrically connected to the drive voltage line 172, and the second storage electrode E2 is electrically connected to the gate electrode G1 of the drive transistor T1, the second electrode D3 of the third transistor T3, and the second electrode D4 of the fourth transistor T4. Therefore, the second storage electrode E2 determines the voltage of the gate electrode G1 of the drive transistor T1, and receives the data voltage Dm through the second electrode D3 of the third transistor T3 or the initialization voltage Vint through the second electrode D4 of the fourth transistor T4.

[0192] Meanwhile, the anode of the organic light-emitting diode (OLED) is electrically connected to the second electrode D6 of the sixth transistor T6 and the first electrode S7 of the seventh transistor T7, and the cathode of the OLED is electrically connected to the common voltage line 741 of the transmission drive low voltage ELVSS.

[0193] FIG. 16 The pixel circuit in the example embodiment includes seven transistors T1, T2, T3, T4, T5, T6 and T7 and a capacitor Cst, but this is not limiting and various modifications can be made to the number of transistors, the number of capacitors and the connections between them.

[0194] Although this disclosure has been described in conjunction with exemplary embodiments that are currently considered to be practiceable, it should be understood that the invention is not limited to the disclosed embodiments. Rather, the invention is intended to cover various modifications and equivalents included within the spirit and scope of the appended claims.

Claims

1. A display apparatus comprising: a display portion displaying an image; and a sensing portion disposed on one side of the display portion and configured to sense an external input, wherein the sensing portion includes at least one first sensing electrode receiving a first sensing signal applied by a sensing voltage source, at least one second sensing electrode disposed to be spaced apart from the first sensing electrode, and at least one compensation electrode disposed to be spaced apart from the first sensing electrode and between the first sensing electrodes, and the compensation electrode is applied with a compensation signal, and wherein the compensation signal is in an opposite phase to that of the first sensing signal. Each of the compensation electrodes is disposed to be spaced apart from the first sensing electrodes while being surrounded by the first sensing electrodes.

2. The display device according to claim 1, wherein The first sensing electrodes and the second sensing electrodes are respectively disposed in a first direction and a second direction and are arranged in a grid pattern, and 3. The display device according to claim 2, wherein The compensation electrodes are arranged in a direction crossing the direction in which the first sensing electrodes are arranged. The first sensing electrodes and the compensation electrodes are disposed on the same layer or different layers, and 4. The display device according to claim 2, wherein The compensation electrodes are disposed not to overlap with the first sensing electrodes or to overlap with the first sensing electrodes. 5.The display apparatus of claim 1, further comprising a sensing wiring disposed between the first sensing electrodes and the second sensing electrodes and electrically connected with the first sensing electrodes or the second sensing electrodes, wherein The first sensing electrodes and the second sensing electrodes are respectively dispersed in a first direction and a second direction and are arranged in a grid pattern, and The compensation electrodes are arranged in a direction parallel to the arrangement direction of the first sensing electrodes. 6.A display apparatus comprising: a display portion displaying an image; and a sensing portion including at least one sensing electrode disposed on one side of the display portion and sensing an external input; wherein the sensing portion further includes a unit sensor capacitor whose first electrode is electrically connected to a first sensing voltage source, and a compensation capacitor whose first electrode is electrically connected to a compensation voltage source, and The display portion includes a first transistor including a first gate electrode, a first active layer overlapping the first gate electrode, and a first source electrode and a first drain electrode electrically connected with the first active layer, a second transistor including a second gate electrode, a second active layer overlapping the second gate electrode, and a second source electrode and a second drain electrode electrically connected with the second active layer, wherein the second source electrode is electrically connected to a data line, a storage capacitor whose first electrode is electrically connected to the second drain electrode and the first gate electrode, and a light emitting diode electrically connected with the first drain electrode, and wherein a first sensing signal applied from the first sensing voltage source is in an opposite phase to that of a compensation signal applied from the compensation voltage source. 7.The display apparatus of claim 6, further comprising: an overlap capacitor whose first electrode is electrically connected to the sensing portion, and whose second electrode is electrically connected to the display portion; ​ ​ a second electrode of the unit sensor capacitor is electrically connected to the first electrode of the overlap capacitor at a first point; a second electrode of the compensation capacitor is electrically connected to the first electrode of the overlap capacitor at a second point; and a second electrode of the overlap capacitor is electrically connected to the display portion at a third point, wherein a voltage change at the third point is less than a predetermined voltage change.

8. The display device according to claim 6, further comprising: a display controller that applies a control signal for driving the display portion; and a sensing controller that applies a control signal for driving the sensing electrode, wherein the sensing controller applies a control signal to the first sensing voltage source and the compensation voltage source, wherein the first sensing voltage source applies a signal from a first time, and the compensation voltage source applies a signal from a second time, and wherein the sensing controller receives a synchronization signal from the display controller, and controls the application time of the compensation signal and the first sensing signal.

9. A display device comprising: a display portion that displays an image; and a sensing portion that is electrically connected to the display portion through an overlap capacitor at a first node, the sensing portion including at least one sensing electrode that senses an external input; wherein the display portion includes: a gate line that extends in a first direction; a data line that extends in a second direction perpendicular to the first direction; and a compensation voltage line that extends in the first direction and is arranged perpendicular to the data line, wherein a compensation signal is applied to the compensation voltage line, the phase of the compensation signal being opposite to the phase of a signal transmitted into the first node through the sensing portion.

10. The display device according to claim 9, further comprising: a display controller that applies a control signal for driving the display portion; a sensing controller that applies a control signal for driving the sensing electrode; and a third circuit portion that receives a synchronization signal from the display controller and the sensing controller, wherein the compensation voltage line applies a signal that is delayed compared to a gate signal applied to the gate line, and wherein the third circuit portion generates the compensation signal by reflecting the synchronization signal.

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