Touch sensing display apparatus and driving method thereof

Abstract

A touch sensing display and driving method are disclosed in which a touch screen panel is disposed on a display panel 110 and comprises first / second touch electrodes XTE / YTE extend in first / second dir

Description

[0001] The present disclosure relates to a touch sensing display apparatus and a driving method thereof, and more particularly, for example, without limitation, to a touch sensing display apparatus and a driving method thereof, which may decrease crosstalk between a display and a touch to improve touch performance and display quality. Discussion of the Related Art

[0002] As thicknesses of display panels are thinned, a parasitic capacitor between data lines and a touch electrode is increasing in capacitance. The parasitic capacitor may be a path through which touch noise flows into a touch sensor. As the parasitic capacitor is large, or a pattern of a data voltage is rapidly changed, crosstalk between a display and a touch may increase, and due to this, touch performance and display quality may be degraded.

[0003] The description provided in the discussion of the related art section should not be assumed to be prior art merely because it is mentioned in or associated with that section. The discussion of the related art section may include information that describes one or more aspects of the subject technology, and the description in this section does not limit the disclosure. SUMMARY

[0004] To overcome the aforementioned problem of the related art, the present disclosure may provide a touch sensing display apparatus and a driving method thereof, which may decrease crosstalk between a display and a touch to improve touch performance and display quality.

[0005] Purposes according to the present disclosure are not limited to the above-mentioned purpose. Other purposes and advantages according to the present disclosure that are not mentioned may be understood based on following descriptions, and may be more clearly understood based on embodiments according to the present disclosure. Further, it will be easily understood that the purposes and advantages according to the present disclosure may be realized using means shown in the claims or combinations thereof.

[0006] To achieve these objects and other advantages and in accordance with the purpose of the disclosure, as embodied and broadly described herein, a touch sensing display apparatus includes: a touch screen panel disposed on the display panel and including first touch electrodes arranged in a first direction in which the data lines of the display panel extend, second touch electrodes arranged in a second direction intersecting the first direction, first compensation electrodes respectively surrounded by the first touch electrodes, and second compensation electrodes respectively surrounded by the second touch electrodes; a touch circuit configured to drive the first touch electrodes and the second touch electrodes to sense a touch input applied to each of touch sensors; and a compensation circuit configured to supply the first compensation electrodes and the second compensation electrodes with a compensation voltage for compensating for crosstalk caused by a variation of each of the data voltages while the touch input is being sensed.

[0007] In another aspect of the present disclosure, a driving method of a touch sensing display apparatus, including a display panel including a plurality of pixels and a touch screen panel disposed on the display panel and including first touch electrodes arranged in a first direction in which the data lines extend and second touch electrodes arranged in a second direction intersecting the first direction, includes: outputting data voltages, which are for driving the plurality of pixels, to data lines of the display panel; driving the first touch electrodes and the second touch electrodes to sense a touch input applied to touch sensors; and supplying a compensation voltage, which is for compensating for crosstalk caused by a variation of each of the data voltages, to the first compensation electrodes respectively surrounded by the first touch electrodes and the second compensation electrodes respectively surrounded by the second touch electrodes while the touch input is being sensed, on the touch screen panel.

[0008] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the principle of the disclosure. In the drawings:

[0010] FIG. 1 is a diagram schematically illustrating a touch sensing display apparatus according to an exemplary embodiment of the present disclosure;

[0011] FIGs. 2A and 2B are diagrams illustrating an example where a touch electrode layer is coupled to a display electrode layer through a cathode electrode layer;

[0012] FIG. 3 is a diagram illustrating crosstalk between a display and a touch with respect to a display image pattern;

[0013] FIG. 4 is a diagram illustrating an implementation example of a compensation unit;

[0014] FIG. 5 is a diagram illustrating an example where first compensation electrodes and second compensation electrodes configuring the compensation unit of FIG. 4 are electrically connected to each other;

[0015] FIG. 6 is a diagram illustrating an example where each of a plurality of compensation units is independently supplied with a compensation voltage;

[0016] FIG. 7 is a diagram illustrating another implementation example of a compensation unit;

[0017] FIG. 8 is a diagram illustrating an example where first compensation electrodes and second compensation electrodes configuring the compensation unit of FIG. 7 are electrically connected to each other;

[0018] FIG. 9 is a diagram illustrating an example where each of first and second touch electrodes and first and second compensation electrodes is implemented with a conductive mesh pattern;

[0019] FIG. 10 is a diagram illustrating a cross-sectional surface taken along line A-A' of FIG. 9;

[0020] FIG. 11 is a diagram illustrating a cross-sectional surface taken along lineB-B' of FIG. 9;

[0021] FIG. 12 is a diagram illustrating an implementation example where a compensation electrode and a compensation pad are electrically connected to each other through a compensation routing line;

[0022] FIGs. 13 and 14 are diagrams illustrating a configuration of a compensation circuit;

[0023] FIG. 15 is a diagram illustrating an operation of a compensation circuit; and

[0024] FIG. 16 is a diagram illustrating an example where a data voltage and a compensation voltage vary with phases opposite to each other.

[0025] Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals should be understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION OF THE DISCLOSURE

[0026] Reference will now be made in detail to embodiments of the present disclosure, examples of which may be illustrated in the accompanying drawings. The progression of processing steps and / or operations described is an example; however, the sequence of steps and / or operations is not limited to that set forth herein and may be changed as is known in the art, with the exception of steps and / or operations necessarily occurring in a particular order. Names of the respective elements used in the following explanations may be selected only for convenience of writing the specification and may be thus different from those used in actual products.

[0027] Hereinafter, the present disclosure will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The disclosure may, however, be embodied in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein; rather, these exemplary embodiments are provided so that this disclosure will be sufficiently thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art.

[0028] Advantages and features of the present disclosure, and implementation methods thereof will be clarified through following exemplary embodiments described with reference to the accompanying drawings. The present disclosure may, however, be embodied in different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be sufficiently thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art. Furthermore, the present disclosure is only defined by scopes of claims.

[0029] The shapes, sizes, ratios, angles, numbers and the like disclosed in the drawings for description of various embodiments of the present disclosure to describe embodiments of the present disclosure are merely exemplary and the present disclosure is not limited thereto. Like reference numerals refer to like elements throughout. Throughout this specification, the same elements are denoted by the same reference numerals. As used herein, the terms “comprise”, “having,” “including” “contain,” “constitute,” “make up of,” “formed of,” and the like and the like suggest that other parts can be added unless the term “only” is used. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless context clearly indicates otherwise.

[0030] Elements in various embodiments of the present disclosure are to be interpreted as including margins of error even without explicit statements. Any implementation described herein as an “example” is not necessarily to be construed as preferred or advantageous over other implementations.

[0031] In describing a position relationship, for example, when a position relation between two parts is described as “on~”, “over-”, “under-”, and “next-”, one or more other parts may be disposed between the two parts unless “just” or “direct” is used, that is, one or more other parts may be disposed located between the two parts. For example, where an element or layer is disposed “on” another element or layer, a third layer or element may be interposed therebetween.

[0032] In descriptions of temporal relationships, for example, temporal precedent relationships between two events such as “after”, “subsequent to”, “before”, etc., another event may occur therebetween unless “directly after”, “directly subsequent” or “directly before” is not indicated.

[0033] It will be understood that, although the terms “first”, “second”, “A” “B” “(A)” or “(B)” etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure.

[0034] In the following description, when the detailed description of the relevant known function or configuration is determined to unnecessarily obscure the important point of the present disclosure, the detailed description will be omitted. Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0035] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning for example consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. For example, the term “part” or “unit” may apply, for example, to a separate circuit or structure, an integrated circuit, a computational block of a circuit device, or any structure configured to perform a described function as should be understood to one of ordinary skill in the art.

[0036] FIG. 1 is a diagram schematically illustrating a touch sensing display apparatus 100 according to embodiments of the present disclosure.

[0037] Referring to FIG. 1, the touch sensing display apparatus 100 according to embodiments of the present disclosure may provide a display function for displaying an input image on a screen, a touch sensing function for sensing a touch input of a user, and a crosstalk compensation function for reducing crosstalk between a display and a touch.

[0038] The touch sensing display apparatus 100 may include a display panel 110 where data lines and gate lines are disposed and a display driving circuit 120 for driving the display panel 110, so as to implement the display function.

[0039] The display panel 110 may be implemented as a liquid crystal display (LCD) panel and an organic light emitting display (OLED) display. The present embodiment may describe an example where the display panel 110 is implemented as the OLED panel, but the inventive concept is not limited thereto and may be applied to the LCD panel.

[0040] The display panel 110 may include a plurality of pixels. Each of the pixels may be implemented with a pixel circuit which is connected to a data line and a gate line through a thin film transistor (TFT). The pixel circuit may include a light emitting device, a driving transistor, one or more switch transistors, and a capacitor. The light emitting device may be implemented as an organic light emitting diode (OLED) where an organic compound layer is disposed between a cathode electrode and an anode electrode. A driving current applied to the light emitting device may be controlled based on a gate-source voltage of the driving transistor. The gate-source voltage of the driving transistor may be determined by a data voltage corresponding to input image data.

[0041] The display driving circuit 120 may include a data driving circuit which supplies data voltages to the data lines of the display panel 110, a gate driving circuit which supplies gate signals to the gate lines of the display panel 110, and a timing controller (TCON) 140 for controlling the data driving circuit and the gate driving circuit. The display driving circuit 120 may be implemented with one or more integrated circuits (ICs).

[0042] The data driving circuit can supply data voltages to the data lines of the display panel 110 according to driving timing control of the timing controller (TCON) 140. The gate driving circuit can supply gate signals to the gate lines of the display panel 110 according to driving timing control of the timing controller (TCON) 140.

[0043] The touch sensing display apparatus 100 may include a touch screen panel TSP where a plurality of touch electrodes TE are disposed and a touch circuit 200 which drives the touch screen panel TSP, so as to implement the touch sensing function.

[0044] As one example, the touch screen panel TSP may further include a plurality of touch lines for electrically connecting the plurality of touch electrodes to the touch circuit 200.

[0045] The touch screen panel TSP may be implemented in the form of a touch panel outside of the display panel 110 or be integrated inside of the display panel 110. In the example where the touch screen panel TSP is implemented in the form of the touch panel outside of the display panel 110, such a touch screen panel TSP may be referred to as an add-on type. In the example where the add-on type of touch screen panel TSP is disposed in the display device 100, the touch panel and the display panel 110 may be separately manufactured and combined in an assembly process.

[0046] The touch electrodes TE disposed in the touch screen panel TSP may include first touch electrodes YTE arranged in a first direction y which is an extension direction of the data lines of the display panel 110 and second touch electrodes XTE arranged in a second direction x intersecting the first direction y. A plurality of touch sensors may be implemented by the first touch electrodes YTE and the second touch electrodes XTE.

[0047] The touch screen panel TSP may be an external type which is manufactured separately from the display panel 110 and is bonded to the display panel 110, or may be an internal type which is manufactured along with the display panel 110 and is disposed at an upper portion of the display panel 110. The present embodiment may be based on a touch screen panel TSP of internal type.

[0048] The touch circuit 200 may include a touch driver 210 which supplies a touch driving signal to the touch screen panel TSP and a touch sensing unit 220 which receives a touch sensing signal from the touch screen panel TSP. The touch circuit 200 may drive the first touch electrodes YTE and the second touch electrodes XTE to sense a touch input applied to the touch sensors.

[0049] The touch sensing unit can perform touch sensing. For example, the touch sensing circuit can perform touch sensing by a self-capacitance sensing technique or a mutual-capacitance sensing technique, without being limited thereto.

[0050] The touch driver 210 may supply the touch driving signal to the second touch electrodes XTE through second touch routing lines. The touch sensing unit 220 may receive a touch sensing signal from each of the first touch electrodes YTE to calculate a capacitance variation of each of the touch sensors and based thereon, may detect whether there is a touch input and coordinate information about a touched position.

[0051] The touch circuit 200 may be implemented as one or more components and may be implemented separately from the display driving circuit 120. Also, all or a portion of the touch circuit 200 may be implemented to be integrated with the display driving circuit 120 or an internal circuit thereof. For example, a portion of the touch circuit 200 may be implemented as an IC along with a data driving circuit of the display driving circuit 120.

[0052] In one or more aspects, the data driving circuit may be connected to the display panel 110 by a tape-automated-bonding (TAB) technique, or connected to a conductive pad such as a bonding pad of the display panel 110 by a chip-on-glass (COG) technique or a chip-on-panel (COP) technique, or connected to the display panel 110 by a chip-on-film (COF) technique, without being limited thereto.

[0053] The touch sensing display apparatus 100 may include compensation electrodes CE disposed in the touch screen panel TSP and a compensation circuit 300 for driving the compensation electrodes CE, so as to implement a crosstalk compensation function.

[0054] The compensation electrodes CE disposed in the touch screen panel TSP may include first compensation electrodes YCE respectively surrounded by the first touch electrodes YTE and second compensation electrodes XCE respectively surrounded by the second touch electrodes XTE. The compensation electrode CE may be electrically disconnected from the touch electrode TE.

[0055] While the touch circuit 200 is sensing a touch input, the compensation circuit 300 may supply the first compensation electrodes YCE and the second compensation electrodes XCE with a compensation voltage CV for compensating for crosstalk caused by a variation of data voltages supplied to data lines.

[0056] The first compensation electrodes YCE and the second compensation electrodes XCE may be divided into a plurality of compensation units CPT separated from one another in the second direction x. The first compensation electrodes YCE and the second compensation electrodes XCE included in the same compensation unit may be electrically connected to each other.

[0057] As one example, the first compensation electrodes YCE and the second compensation electrodes XCE included in the same compensation unit may be electrically short-circuited with each other and are supplied with a same compensation voltage, but is not limited thereto.

[0058] Each of the plurality of compensation units CPT may be connected to the compensation circuit 300 through an individual compensation routing line. The compensation circuit 300 may supply, through the compensation routing line, the same compensation voltage to the first compensation electrodes YCE and the second compensation electrodes XCE included in the same compensation unit.

[0059] For example, the compensation circuit 300 may be configured to supply the first compensation electrodes YCE and the second compensation electrodes XCE included in the same compensation unit with a compensation voltage for compensating for crosstalk caused by a variation of each of the data voltages while the touch input is being sensed.

[0060] The touch sensing display apparatus 100 may include a micro control unit (MCU) 150 which controls the touch circuit 200 and the compensation circuit 300. The micro control unit 150 may be supplied with a control synchronization signal Csync from the timing controller 140 to generate a touch synchronization signal Tsync for controlling the touch circuit 200 and the compensation circuit 300.

[0061] The micro control unit 150 may transfer the touch synchronization signal Tsync, based on an interface defined between the touch circuit 200 and the compensation circuit 300. The micro control unit 150 may be configured as one IC along with a touch controller of the touch circuit 200, or may be configured as one IC along with the timing controller 140, but is not limited thereto. For example, the micro control unit 150 may be manufactured separately from the touch controller of the touch circuit 200, or may be manufactured separately from the timing controller 140.

[0062] The timing controller (TCON) 140 may control the display driving circuit 120 and the micro control unit 150. The timing controller 140 may be supplied with a data signal of an input image and a timing synchronization signal such as a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and a dot clock from a host system.

[0063] The timing controller 140 may be connected to the display driving circuit 120 through an internal interface. The timing controller 140 may transfer a data signal Vdata of an input image to the display driving circuit 120. The timing controller 140 may control a gate driving timing of the display driving circuit 120, based on a scan timing control signal such as a gate start pulse, a gate shift clock, and a gate output enable signal. Also, the timing controller 140 may control a data driving timing of the display driving circuit 120, based on a data timing control signal such as a source sampling clock and a source output enable signal.

[0064] FIGs. 2A and 2B are diagrams illustrating an example where a touch electrode layer is coupled to a display electrode layer through a cathode electrode layer.

[0065] Referring to FIGs. 2A and 2B, a touch screen panel TSP may be disposed on a display panel 110 in an on-cell type or an add on type. The display panel 110 may include an emission array layer LOL and a TFT array layer LOT for pixel implementation. Data lines DL may be included in the TFT array layer LOT.

[0066] Touch electrodes XTE and YTE configuring a touch sensor may be electrically coupled to the TFT array layer LOT through the emission array layer LOL. The emission array layer LOL may include a cathode electrode CAT of an OLED connected to a low-level pixel power and the cathode electrode CAT may function as a common electrode shared by all pixels.

[0067] The cathode electrode CAT may function as a medium for noise inflow. The cathode electrode CAT may be coupled to the touch electrodes XTE and YTE through a first parasitic capacitor Cpl and may be coupled to data lines DL through a second parasitic capacitor Cp2. Accordingly, display noise caused by a variation of a data voltage may flow into the touch sensor through the first and second parasitic capacitors Cpl and Cp2. Each of the first and second parasitic capacitors Cpl and Cp2 may be a noise inflow path.

[0068] FIG. 3 is a diagram illustrating crosstalk between a display and a touch with respect to a display image pattern.

[0069] Referring to FIG. 3, in a display apparatus according to an exemplary embodiment of the present disclosure, a touch screen panel including touch electrodes TE may be protected by a cover window CW. For example, the cover window CW may be disposed on the touch screen panel including touch electrodes TE to protect the touch screen panel. The cover window CW may be attached to the touch screen panel through an adhesive layer PSA. When a measurer ME measures noise in contact with one conductive pattern of the cover window CW, it may be seen that a magnitude of the noise flowing into the touch sensor is changed based on a display image pattern.

[0070] Display noise occurring in data lines DL may increase more in a whiteblack alternating pattern (Horizontal one by one, Hlbl) than a white image pattern. Such display noise may affect a touch sensing signal through cathode coupling. Therefore, touch noise caused by the cathode coupling may increase more in the whiteblack alternating pattern (Horizontal one by one, Hlbl) than the white image pattern.

[0071] FIG. 4 is a diagram illustrating an implementation example of a compensation unit. FIG. 5 is a diagram illustrating an example where first compensation electrodes and second compensation electrodes configuring the compensation unit of FIG. 4 are electrically connected to each other. FIG. 6 is a diagram illustrating an example where each of a plurality of compensation units is independently supplied with a compensation voltage.

[0072] Referring to FIGs. 4 to 6, compensation units CPT may be for compensating for crosstalk caused by a variation of data voltages supplied to data lines DL. Each of the compensation units CPT may be disposed to overlap n (where n may be a natural number of 2 or more) number of data lines DI to Dn, and thus, may compensate for an average variation of data voltages on the data lines DI to Dn.

[0073] In a compensation unit CPT overlapping the data lines DI to Dn, first compensation electrodes YCE may be disposed on the same plane as first touch electrodes YTE and may be respectively surrounded by the first touch electrodes YTE. In the compensation unit CPT, second compensation electrodes XCE may be disposed on the same plane as second touch electrodes XTE and may be respectively surrounded by the second touch electrodes XTE.

[0074] In the compensation unit CPT, the first compensation electrodes YCE may be electrically connected to the second compensation electrodes XCE through connection electrodes ECON.

[0075] In the compensation unit CPT, the connection electrodes ECON may be disposed on a plane which differs from the first and second compensation electrodes YCE and XCE and may be connected to the first and second compensation electrodes YCE and XCE through a contact hole passing through an insulation layer, but is not limited thereto. Each of the connection electrodes ECON may connect the first compensation electrode YCE and the second compensation electrode XCE, which are disposed adjacent to each other with the first and second compensation electrodes YCE and XCE therebetween.

[0076] In the compensation unit CPT, the first and second compensation electrodes YCE and XCE may be short-circuited with each other through the connection electrodes ECON. A compensation circuit may supply the same compensation voltage CV to the first and second compensation electrodes YCE and XCE included in the compensation unit CPT. The compensation voltage CV may be for compensating for an average variation of data voltages on the data lines DI to Dn overlapping each other.

[0077] As one example, the compensation circuit 300 may be configured to supply the first and second compensation electrodes YCE and XCE included in the compensation unit CPT with the compensation voltage CV for compensating for the average variation of data voltages on the data lines DI to Dn overlapping each other while the touch input is being sensed, but is not limited thereto.

[0078] The compensation voltage CV may be an alternating current (AC) voltage which varies with a cycle of one horizontal period assigned for driving of pixels disposed in one pixel row. The compensation voltage and the data voltages may vary with phases opposite to each other. That is, the compensation voltage CV may be an AC voltage which varies with a phase opposite to an average variation of data voltages on the data lines DI to Dn. One pixel row may be a set of pixels which are arranged in parallel in a second direction x and are connected to the same gate lines. One horizontal period may be a time obtained by dividing one frame period by a vertical resolution.

[0079] Moreover, n number of data lines DI to Dn may correspond to each of the compensation units CPT. For example, the data lines may be divided into a plurality of groups corresponding to the plurality of compensation units CPT, and each of the plurality of compensation units CPT may be disposed to overlap n number of data lines DI to Dn. To this end, data lines may be grouped in a unit of n data lines. The number of groups of data lines may be equal to the number of compensation units CPT.

[0080] The compensation units CPT may be configured to be electrically disconnected from each other and may each compensation unit CPT may be independently supplied with the compensation voltage CV. The compensation voltages CV applied to the compensation units CPT may be equal to one another, or may differ. Each compensation unit CPT may be supplied with the compensation voltage CV from the compensation circuit through an individual compensation routing line.

[0081] The compensation units CPT may be separated from each other in a second direction x and may have a length in a first direction y and a width in a second direction x. A width of each compensation unit CPT may be equal to that of a touch sensor unit. An area of a touch sensor unit may be implemented to be a sum of an area of one first touch electrode YTE and an area of one second touch electrode XTE.

[0082] FIG. 7 is a diagram illustrating another implementation example of a compensation unit. FIG. 8 is a diagram illustrating an example where first compensation electrodes and second compensation electrodes configuring the compensation unit of FIG. 7 are electrically connected to each other.

[0083] Referring to FIG. 7, 2n number of data lines DI to D2n may correspond to each of compensation units CPT, but is not limited thereto. To this end, data lines may be grouped in a unit of 2n data lines. For example, n number of data lines DI to Dn may correspond to each of the compensation units CPT. To this end, data lines may be grouped in a unit of n data lines. The number of groups of data lines may be equal to the number of compensation units CPT. For example, the data lines may be divided into a plurality of groups corresponding to the plurality of compensation units.

[0084] The compensation units CPT may be separated from each other in a second direction x and may have a length in a first direction y and a width in a second direction x. A width of each compensation unit CPT may be two times a width of a touch sensor unit. An area of a touch sensor unit may be implemented to be a sum of an area of one first touch electrode YTE and an area of one second touch electrode XTE.

[0085] Referring to FIG. 8, in the same compensation unit CPT, each of first compensation electrodes YCE may include a plurality of first sub compensation electrodes S-YCE which are electrically connected to each other, and each of second compensation electrodes XCE may include a plurality of second sub compensation electrodes which are electrically connected to each other.

[0086] Referring to FIG. 8, in the same compensation unit CPT, each of first compensation electrodes YCE may include four first sub compensation electrodes S-YCE which are electrically connected to each other, and each of second compensation electrodes XCE may include four second sub compensation electrodes which are electrically connected to each other, but is not limited thereto.

[0087] The plurality of first sub compensation electrodes S-YCE may be surrounded by a first touch electrode YTE. For example, the plurality of first sub compensation electrodes S-YCE included in each of first compensation electrodes YCE may be surrounded by the first touch electrode YTE. The plurality of first sub compensation electrodes S-YCE may be arranged apart from one another at a certain interval, and adjacent ones of the plurality of first sub compensation electrodes S-YCE may be connected to each other through a connection electrode ECON.

[0088] The plurality of second sub compensation electrodes S-XCE may be surrounded by a second touch electrode XTE. For example, the plurality of second sub compensation electrodes S-XCE included in each of second compensation electrodes XCE may be surrounded by the second touch electrode XTE. The plurality of second sub compensation electrodes S-XCE may be arranged apart from one another at a certain interval, and adjacent ones of the plurality of second sub compensation electrodes S-XCE may be connected to each other through the connection electrode ECON.

[0089] Moreover, a first sub compensation electrode S-YCE and a second sub compensation electrode S-XCE which are disposed adjacent to each other with first and second touch electrodes YTE and XTE therebetween may be connected to each other through the connection electrode ECON.

[0090] In a compensation unit CPT, a real area of a compensation electrode may be less than in FIG. 8 than in FIG. 7. Comparing with FIG. 7, FIG. 8 may have an advantage where it is easy to adjust a real area of a compensation electrode, and thus, it is easy to control a magnitude of a parasitic capacitor connected to a compensation electrode.

[0091] FIG. 9 is a diagram illustrating an example where each of first and second touch electrodes and first and second compensation electrodes is implemented with a conductive mesh pattern. FIG. 10 is a diagram illustrating a cross-sectional surface taken along line A-A' of FIG. 9. FIG. 11 is a diagram illustrating a cross-sectional surface taken along line B-B' of FIG. 9.

[0092] Referring to FIGs. 9 to 11, a touch sensing display apparatus according to an exemplary embodiment of the present disclosure may display an image on a screen of a display panel through a plurality of pixels during a display period and may sense a variation of a mutual capacitance based on a touch input of a user during a touch period to sense whether there is a touch input and a touched position. The touch sensing display apparatus according to an exemplary embodiment of the present disclosure may supply a compensation voltage to first and second compensation electrodes YCE and XCE configuring a compensation unit during the touch period, thereby reducing noise caused by crosstalk between a display and a touch.

[0093] The display period and the touch period may partially overlap or fully overlap each other.

[0094] Each pixel may include an emission array layer LOL, including a light emitting device AND, EL, and CAT, a bank BNK, and an encapsulation layer ENCP, and a TFT array layer LOT including at least one TFT insulation layer OIL and data lines DL.

[0095] The bank BNK serves to define a sub-pixel. Thus, the bank BNK may be made of an insulating material containing a black material. The bank BNK may be made of, for example, a transparent carbon-based mixture. Specifically, the bank BNK may contain carbon black, but is not limited thereto. The bank may also be made of a transparent insulating material.

[0096] The light emitting device AND, EL, and CAT may include an emission stack EL and an anode electrode AND patterned to be separated from each other by pixel units, and a cathode electrode CAT shared by all pixels. The cathode electrode CAT may be disposed on the data lines and connected to the pixels in common,.

[0097] The bank BNK may define an opening region (or an emission region) of each of the pixels. The bank BNK may radially surround the opening region where the emission stack EL is formed. The bank BNK may be formed of an opaque material (for example, black) to prevent light interference between adjacent pixels. In this case, the bank BNK may include a light blocking material including at least one of a color pigment, organic black, and carbon.

[0098] The encapsulation layer ENCP may prevent external water or oxygen from penetrating into the light emitting device AND, EL, and CAT vulnerable to water or oxygen. To this end, the encapsulation layer ENCP may include an at least one-layer inorganic encapsulation layer and an at least one-layer organic encapsulation layer.

[0099] The inorganic encapsulation layer may include an inorganic insulating material. For example, the inorganic encapsulation layer may include an inorganic insulating material capable of low-temperature deposition, such as silicon nitride (SiN), silicon oxide (SiO), silicon oxynitride (SiON) and aluminum oxide (AI2O3).

[00100] The organic encapsulation layer may include an organic insulating material, such as acrylic resin, epoxy resin, polyimide, polyethylene and silicon oxy carbide (SiOC).

[00101] A touch screen panel TSP may be formed on the encapsulation layer ENCP.

[00102] The touch screen panel TSP may include a touch buffer layer TBUF, an electrode array layer, and a touch protection layer TP AS.

[00103] The touch buffer layer TBUF may be bonded to the encapsulation layer ENCP. The electrode array layer may be disposed on the touch buffer layer TBUF. The electrode array layer may include first and second touch electrodes YTE and XTE and first and second compensation electrodes YCE and XCE, which are disposed on an interlayer insulation layer TILD. The electrode array layer may further include a bridge electrode YBE disposed under the interlayer insulation layer TILD. The bridge electrode YBE may electrically connect adjacent first compensation electrodes YCE with each other.

[00104] Each of the first and second touch electrodes YTE and XTE and the first and second compensation electrodes YCE and XCE may be implemented with conductive mesh patterns, but is not limited thereto. The conductive mesh patterns may be formed as a mesh type by using an at least one-layer conductive layer of titanium (Ti), aluminum (Al), molybdenum (Mo), molybdenum titanium (MoTi), copper (Cu), tantalum (Ta), and indium tin oxide (ITO), which are better in conductivity than a transparent conductive layer.

[00105] The conductive mesh patterns may be formed in a three-layer structure which is stacked like Ti / Al / Ti, MoTi / Cu / MoTi, or Ti / Al / Mo, but is not limited thereto. For example, each of the first and second touch electrodes YTE and XTE and the first and second compensation electrodes YCE and XCE may be formed in a three-layer structure which is stacked like Ti / Al / Ti, MoTi / Cu / MoTi, or Ti / Al / Mo, but is not limited thereto Accordingly, the first and second touch electrodes YTE and XTE and the first and second compensation electrodes YCE and XCE may decrease in resistance and capacitance, and thus, touch sensitivity may be enhanced.

[00106] The conductive mesh patterns may be disposed in the electrode array layer to avoid opening regions, overlap the bank BNK, and have a line width which is very thin, thereby preventing an aperture ratio and a transmittance from being reduced by the conductive mesh patterns.

[00107] Referring to FIG. 10, a first compensation parasitic capacitor Cyc may be formed between a first compensation electrode YCE and a cathode electrode CAT. The first compensation parasitic capacitor Cyc may function as a path for compensating for a voltage ripple of the cathode electrode CAT, and to this end, it may be preferable that a capacitance thereof is large. With respect to one of touch sensors, the first compensation parasitic capacitor Cyc may be 50% or more of a parasitic capacitor Cp2 between the cathode electrode CAT and data lines DL overlapping a first touch electrode YTE region, but is not limited thereto.

[00108] As one example, with respect to one of touch sensors, the first compensation parasitic capacitor Cyc between a first compensation electrode YCE and a cathode electrode CAT is 50% or more of the parasitic capacitor Cp2 between the cathode electrode CAT and data lines DL overlapping a first touch electrode YTE region.

[00109] A first peripheral parasitic capacitor Cyp may be formed between the first compensation electrode YCE and the first touch electrode YTE. The first peripheral parasitic capacitor Cyp may be coupling between the first compensation electrode YCE and the first touch electrode YTE, and thus, it may be preferable that a capacitance thereof is small. The first peripheral parasitic capacitor Cyp between the first compensation electrode YCE and the first touch electrode YTE may be 30% or less of a parasitic capacitor Cpl between the cathode electrode CAT and the first touch electrode YTE, but is not limited thereto.

[00110] Referring to FIG. 11, a second compensation parasitic capacitor Cxc may be formed between a second compensation electrode XCE and a cathode electrode CAT. The second compensation parasitic capacitor Cxc may function as a path for compensating for a voltage ripple of the cathode electrode CAT, and to this end, it may be preferable that a capacitance thereof is large. With respect to one of touch sensors, the second compensation parasitic capacitor Cxc between the second compensation electrode XCE and the cathode electrode CAT may be 50% or more of a parasitic capacitor Cp2 between the cathode electrode CAT and data lines DL overlapping a second touch electrode XTE region, but is not limited thereto.

[00111] A second peripheral parasitic capacitor Cxp may be formed between the second compensation electrode XCE and the second touch electrode XTE. The second peripheral parasitic capacitor Cxp may be coupling between the second compensation electrode XCE and the second touch electrode XTE, and thus, it may be preferable that a capacitance thereof is small. The second peripheral parasitic capacitor Cxp between the second compensation electrode XCE and the second touch electrode XTE may be 30% or less of a parasitic capacitor Cpl between the cathode electrode CAT and the second touch electrode XTE.

[00112] FIG. 12 is a diagram illustrating an implementation example where a compensation electrode and a compensation pad are electrically connected to each other through a compensation routing line.

[00113] Referring to FIG. 12, a bezel region BZ may be disposed in at least one side of an active area AA where touch electrodes YTE and XTE and compensation electrodes YCE and XCE are disposed. The bezel region BZ may include a bending region which enables a substrate to be bent or folded. A crack prevention layer may be further provided in the bending region so that the bending region is easily bent.

[00114] For example, the bending region may be in a bent state, and the remaining area of the substrate except for the bending region may be in a flat state. In this case, as the bending region is bent, the bezel region BZ may be located on a rear surface of the display area. However, embodiments of the present disclosure are not limited thereto.

[00115] The pads may be disposed in the bezel region BZ. Display pads D-Pad connected to data lines, touch pads T-Pad connected to touch routing lines, and compensation pads C-Pad connected to compensation routing lines CRL may be disposed in the bezel region BZ.

[00116] The compensation electrodes YCE and XCE may contact the compensation routing lines CRL and may be connected to the compensation pads C-Pad through the compensation routing lines CRL. The compensation pads C-Pad may output a compensation voltage, varying in a unit of one horizontal period, to the compensation routing lines CRL. The compensation pads C-Pad may be connected to an output terminal of a compensation circuit.

[00117] FIGs. 13 and 14 are diagrams illustrating a configuration of a compensation circuit. FIG. 15 is a diagram illustrating an operation of a compensation circuit. FIG. 16 is a diagram illustrating an example where a data voltage and a compensation voltage vary with phases opposite to each other.

[00118] Referring to FIGs. 13 to 15, a compensation circuit 300 may generate a compensation voltage CVh which is to be supplied to each of compensation units. A configuration and an operation of the compensation circuit 300 for generating the compensation voltage CVh which is to be supplied to one compensation unit will be described below. In the following embodiment, it may be assumed that one compensation unit overlaps n number of data lines DI to Dn. However, embodiments of the present disclosure are not limited thereto.

[00119] The compensation circuit 300 may include a first line memory MEM1, a second line memory MEM2, a lookup table LUT, and a compensation voltage generator ACR, so as to generate the compensation voltage CVh which is to be supplied to one compensation unit. For example, the first line memory MEM1 and the second line memory MEM2 may be connected to the compensation voltage generator ACR. The first line memory MEM1 may receive data voltages DATA(H-l), and the second line memory MEM2 may receive data voltages DATA(H).

[00120] The first line memory MEM1 may store data voltages DATA(H-1) which is to be supplied to n number of data lines DI to Dn, in an H-lst horizontal period.

[00121] The second line memory MEM2 may store data voltages DATA(H) which is to be supplied to n number of data lines DI to Dn, in an H111 horizontal period.

[00122] As one example, in a predetermined time, a variation direction of a compensation voltage supplied to the one compensation unit may be opposite to an average variation direction of data voltages supplied to n number of data lines DI to Dn of the one group.

[00123] With reference to the first line memory MEM1 and the second line memory MEM2, the compensation voltage generator ACR may calculate an average value △ of inverse gray levels of n number of data voltages supplied to n number of data lines DI to Dn. For example, the compensation voltage generator ACR may subtract n number of data voltages DATA(H) of the H111 horizontal period from n number of data voltages DATA(H-l) of the H-lst horizontal period, and thus, may obtain n number of subtraction results representing inverse gray levels. Also, the compensation voltage generator ACR may calculate an average value △ of the n subtraction results. This may be expressed as the following Equation 1.

[00124] [Equation 1] A= S (Dj,H-i - Dj, H) / n, (1< j <n)

[00125] The compensation voltage generator ACR may calculate a weight a determined based on an average value △ of inverse gray levels of n number of data voltages and a compensation voltage CVh-i of the H-lst horizontal period, with reference to the lookup table LUT.

[00126] The compensation voltage generator ACR may add the compensation voltage CVh-i of the H-lst horizontal period to a result obtained by multiplying the average value △ of inverse gray levels of n number of data voltages by the weight a, and thus, may finally generate a compensation voltage CVh of the H111 horizontal period. This may be expressed as the following Equation 2.

[00127] [Equation 2] CVh = a *△+ CVh-i

[00128] Therefore, as in FIG. 16, the compensation voltage CVh of the H111 horizontal period may vary with a phase opposite to an average variation AVdata of n number of data voltages. As a result, coupling noise of a touch electrode induced by a data voltage variation may be reduced, and a voltage ripple of a cathode electrode may be removed. Also, crosstalk between a display and a touch may decrease, and thus, touch performance and display quality may be improved.

[00129] The embodiments of the present disclosure may realize the following effects.

[00130] The embodiments of the present disclosure may supply compensation electrodes with a compensation voltage for compensating for crosstalk caused by a variation of a data voltage while a touch input is being sensed, and thus, may reduce crosstalk between a display and a touch to improve touch performance and display quality.

[00131] The effects according to the present disclosure are not limited to the above examples, and other various effects may be included in the specification.

[00132] While the present disclosure has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the following claims.

Claims

1. A touch sensing display apparatus comprising:a touch screen panel disposed on a display panel and including first touch electrodes arranged in a first direction in which data lines of the display panel extend, second touch electrodes arranged in a second direction intersecting the first direction, first compensation electrodes respectively surrounded by the first touch electrodes, and second compensation electrodes respectively surrounded by the second touch electrodes;a touch circuit configured to drive the first touch electrodes and the second touch electrodes to sense a touch input applied to each of a plurality of touch sensors; anda compensation circuit configured to supply the first compensation electrodes and the second compensation electrodes with a compensation voltage corresponding to data voltages applied to the data lines of the display panel while the touch input is being sensed.

2. The touch sensing display apparatus of claim 1, further comprising a display panel including a plurality of pixels; and a display driving circuit configured to output the data voltages, which are for driving the plurality of pixels, to data lines of the display panel,wherein the compensation voltage is an alternating current voltage which varies at a period of one horizontal period assigned for driving of pixels disposed in one pixel row, andwherein the compensation voltage and the data voltages vary with phases opposite to each other.

3. The touch sensing display apparatus of claim 2, wherein one horizontal period is a time obtained by dividing one frame period by a vertical resolution.

4. The touch sensing display apparatus of any preceding claim, wherein the first compensation electrodes and the second compensation electrodes are divided into a plurality of compensation units separated from each other in the second direction, andwherein the first compensation electrodes and the second compensation electrodes included in a same compensation unit are electrically short-circuited with each other and are supplied with a same compensation voltage.

5. The touch sensing display apparatus of claim 4, wherein a compensation unit is electrically disconnected from any other compensation unit and is independently supplied with a compensation voltage.

6. The touch sensing display apparatus of claim 4 or 5, wherein the data lines are divided into a plurality of groups corresponding to the plurality of compensation units, andwherein one compensation unit included in the plurality of compensation units overlaps a plurality of data lines of one group among the plurality of groups.

7. The touch sensing display apparatus of claim 6, wherein, in a predetermined time, a variation direction of a compensation voltage supplied to the one compensation unit is opposite to an average variation direction of a plurality of data voltages supplied to the plurality of data lines of the one group.

8. The touch sensing display apparatus of claim 7, wherein, the compensation circuit is configured to calculate an average value of inverse gray levels of the plurality of data voltages supplied to the plurality of data lines of the one group and generate the compensation voltage based on the average value of inverse gray levels of the plurality of data voltages.

9. The touch sensing display apparatus of claim 4, wherein, in a same compensation unit,each of the first compensation electrodes comprises a plurality of first sub compensation electrodes electrically connected to each other, andeach of the second compensation electrodes comprises a plurality of second sub compensation electrodes electrically connected to each other.

10. The touch sensing display apparatus of claim 9, wherein, the plurality of first sub compensation electrodes are surrounded by the first touch electrode and arranged apart from one another, andthe plurality of second sub compensation electrodes are surrounded by the second touch electrode and arranged apart from one another.

11. The touch sensing display apparatus of claim 9 or 10, wherein, the first sub compensation electrode and the second sub compensation electrode which are disposed adjacent to each other are connected to each other through a connection electrode.

12. The touch sensing display apparatus of any of claims 2 to 11, wherein each of the first touch electrodes, the second touch electrodes, the first compensation electrodes, and the second compensation electrodes is implemented with conductive mesh patterns.

13. The touch sensing display apparatus of claim 12, wherein the conductive mesh patterns are formed in a three-layer structure and disposed in an electrode array layer of the touch screen panel.

14. The touch sensing display apparatus of claim 12 or 13, wherein a bank pattern for defining emission regions of the pixels are included in the display panel, andwherein the conductive mesh patterns avoid the emission regions and overlap the bank pattern.

15. The touch sensing display apparatus of any of claims 2 to 14, wherein the display panel further comprises a cathode electrode disposed on the data lines and connected to the pixels in common,wherein with respect to one of the plurality of touch sensors, a parasitic capacitor between the first compensation electrode and the cathode electrode is 50%or more of the capacitance of a parasitic capacitor between the cathode electrode and data lines overlapping a first touch electrode region, andwherein with respect to one of the plurality of touch sensors, a parasitic capacitor between the first compensation electrode and the first touch electrode is 30% or less of the capacitance of a parasitic capacitor between the cathode electrode and the first touch electrode.

16. The touch sensing display apparatus of any of claims 2 to 14, wherein the display panel further comprises a cathode electrode disposed on the data lines and connected to the pixels in common,wherein with respect to one of plurality of touch sensors, a parasitic capacitor between the second compensation electrode and the cathode electrode is 50% or more of the capacitance of a parasitic capacitor between the cathode electrode and data lines overlapping a second touch electrode region, andwherein with respect to one of the plurality of touch sensors, a parasitic capacitor between the second compensation electrode and the second touch electrode is 30% or less of the capacitance of a parasitic capacitor between the cathode electrode and the second touch electrode.

17. The touch sensing display apparatus of any preceding claim, wherein the compensation voltage compensates for crosstalk caused by a variation of each of data voltages.

18. The touch sensing display apparatus of any preceding claim, wherein the first compensation electrodes are disposed on a same plane as the first touch electrodes,and the second compensation electrodes are disposed on a same plane as the second touch electrodes.

19. A driving method of a touch sensing display apparatus including the touch sensing display apparatus of any one of claims 1 to 18, the driving method comprising:outputting data voltages, which are for driving a plurality of pixels of the display panel, to data lines of the display panel;driving the first touch electrodes and the second touch electrodes to sense a touch input applied to touch sensors; andsupplying a compensation voltage corresponding to the data voltages, to the first compensation electrodes respectively surrounded by the first touch electrodes and the second compensation electrodes respectively surrounded by the second touch electrodes while the touch input is being sensed, on the touch screen panel.A

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