Display device, method of driving the same, and display system including the display device

Abstract

The invention discloses a display device, a method of driving the same, and a display system including the display device. The display device includes: a touch array including a plurality of touch electrodes; and a touch driver configured to sense a touch adjacent to the touch array, in which the touch driver transmits an uplink signal including different position information therein to an external device through at least some of the touch electrodes in a first period of time, and receiving position information of the external device on the touch array from the external device in a second time period after the first time period, and wherein the position information of the external device is calculated by the external device using the uplink signal.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2023-0073571 filed in the Korean Intellectual Property Office on June 8, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] The present disclosure relates generally to electronic devices, and more particularly, to a display device including a touch electrode, a method of driving the display device, and a display system including the display device. Background Art

[0004] Electronic devices that are generally equipped with touch panels enable users to indicate a location by touch. In particular, with the rise of mobile electronic devices such as smartphones and tablet computers, touch panels have become ubiquitous. In recent years, there has been an increasing demand for touch panels that recognize input from tools other than fingers, such as active pens.

[0005] In some cases, information about the touch position of an object located above a display device is needed. Although the user's location and coordinate information can be obtained from signals transmitted from satellites, or indoor positioning technology can be used to identify the location of people in buildings, these methods have difficulty in obtaining accurate touch position information on the display device. Summary of the invention

[0006] Embodiments of the present disclosure provide a display device, a method for driving the display device, and a display system including the display device, which are capable of efficiently and effectively acquiring position information of an external device located above the display device.

[0007] According to an embodiment of the present disclosure, a display device is provided, comprising: a touch array comprising a plurality of touch electrodes; and a touch driver configured to sense a touch adjacent to the touch array, wherein the touch driver transmits an uplink signal including different position information to an external device through at least some of the touch electrodes in a first time period, and receives position information of the external device on the touch array from the external device in a second time period after the first time period, and wherein the position information of the external device is calculated by the external device using the uplink signal.

[0008] According to an embodiment of the present disclosure, a method for driving a display device including a touch array is provided, the method including: sensing a touch adjacent to the touch array; transmitting an uplink signal including different position information to an external device through touch electrodes of the touch array in a first time period; and receiving position information of the external device on the touch array from the external device in a second time period after the first time period, wherein the position information of the external device on the touch array is calculated by the external device using the uplink signal.

[0009] According to an embodiment of the present disclosure, a display system is provided, comprising: a display device comprising a touch array and a touch driver, the touch array comprising a plurality of touch electrodes, the touch driver being configured to sense a touch adjacent to the touch array; and an external device configured to communicate with the display device through the touch array, wherein the touch driver: when the external device is adjacent to the touch array, transmits an uplink signal including different position information to the external device through one or more capacitors generated between at least some of the touch electrodes and the external device in a first time period; and receives a downlink signal including position information of the external device from the external device in a second time period after the first time period, and wherein the external device comprises a position sensor, the position sensor being configured to calculate position information of the external device on the touch array using the uplink signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In the accompanying drawings, dimensions may be exaggerated for clarity. It should be understood that when an element is referred to as being "between" two elements, it may be the only element between the two elements, or one or more intervening elements may also be present. Throughout the specification, the same reference numerals may refer to the same elements.

[0011] Figure 1 is a block diagram illustrating a display device according to an embodiment of the present disclosure.

[0012] Figure 2 It is a graphic Figure 1 A cross-sectional view of an embodiment of a display device shown in FIG.

[0013] Figure 3 It is a graphic Figure 1 A block diagram of an embodiment of a touch array and a touch driver is shown in FIG.

[0014] Figure 4 It is a graphic Figure 1 A block diagram of an embodiment of a display panel and a display driver is shown in FIG.

[0015] Figure 5 is a block diagram illustrating an embodiment of a display system including a display device.

[0016] Figure 6 It is shown in Figure 5 A block diagram of the process of transmitting uplink signals in a display system is shown in FIG.

[0017] Figure 7 , Figure 8 and Fig. 9 is a timing diagram illustrating an embodiment of an uplink signal in a first time period.

[0018] Fig.10 is a diagram illustrating an external device, a touch array, and a capacitor formed between the external device and the touch array.

[0019] Fig.11 is the diagram being applied to Fig.10 2 is a timing diagram of signals of some of the touch electrodes shown in .

[0020] Fig.12 It is shown in Figure 5 The block diagram shown in FIG. 1 shows the process of transmitting downlink signals in the display system.

[0021] Fig.13 is a timing diagram illustrating an embodiment of an uplink signal in a first time period and a downlink signal in a second time period.

[0022] Fig.14 is a flowchart illustrating a method of driving a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.In addition, the present disclosure is not limited to the embodiments described herein, but can be embodied in various different forms.

[0024] In the specification, when an element is referred to as "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or indirectly connected or coupled to the other element and one or more intermediate elements are interposed therebetween. The technical terms used herein to describe a specific embodiment are not intended to limit the embodiment. It should be understood that when a component "includes" an element, unless there is other description to the contrary, it should be understood that the component does not exclude another element, but can further include another element. It should be understood that, for the purpose of this disclosure, "at least one of X, Y and Z" can be interpreted as only X, only Y, only Z or any combination of two or more items in X, Y and Z (for example, XYZ, XY, YZ, XZ). Similarly, for the purpose of this disclosure, "at least one selected from the group consisting of X, Y and Z" can be interpreted as only X, only Y, only Z or any combination of two or more items in X, Y and Z (for example, XYZ, XY, YZ, XZ).

[0025] It should be understood that although the terms "first", "second", etc. can be used to describe various elements in this article, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, the "first" element discussed below can also be referred to as the "second" element.

[0026] Spatial relative terms such as "below" and "above" may be used herein to describe the relationship between one element and another element as illustrated in the figure. It should be understood that the spatial relative terms and the illustrated configurations are intended to cover different orientations of the device in use or operation in addition to the orientations described herein and depicted in the figure. For example, if the device in the figure is flipped, the elements described as "below" or "below" other elements or features will then be oriented to be "above" other elements or features. Therefore, the term "above" can cover both above and below orientations. The device can be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative descriptors used in this article should be interpreted accordingly.

[0027] In addition, embodiments of the present disclosure are described herein with reference to schematic diagrams of ideal embodiments (and intermediate structures) of the present disclosure, such that changes in the shapes shown in the figures due to, for example, manufacturing techniques and / or tolerances are to be expected. Therefore, embodiments of the present disclosure should not be limited to the specific shapes of the regions shown in the drawings, but should include shape deviations caused by, for example, manufacturing techniques. The regions shown in the drawings are schematic in nature, and their shapes do not represent the actual shapes of the regions of the device and do not limit the scope of the present disclosure.

[0028] Figure 1 is a block diagram illustrating a display device according to an embodiment of the present disclosure.

[0029] refer to Figure 1 , the panel 10 may include a display panel 110 and a touch array 130 overlapping the display panel 110 .

[0030] In some embodiments, after the display panel 110 and the touch array 130 are separately manufactured, the display panel 110 and the touch array 130 may be coupled to each other so as to at least partially overlap each other. In other embodiments, the display panel 110 and the touch array 130 may be integrally manufactured. The touch array 130 may be directly formed on at least one layer constituting the display panel 110 (e.g., an upper substrate, a thin film encapsulation layer, or an insulating layer of the display panel 110).

[0031] exist Figure 1FIG. 1 illustrates that the touch array 130 is disposed above the display panel 110 . However, the touch array 130 is not limited thereto. For example, the touch array 130 may be disposed below the display panel 110 .

[0032] The display panel 110 may include a display area DA for displaying an image and a non-display area NDA at the periphery of the display area DA. The non-display area NDA may at least partially surround the display area DA. The display panel 110 may include pixels PX formed on a substrate. The pixels PX may be arranged in the display area DA. In an embodiment, the substrate may be a rigid substrate including a material such as glass (e.g., tempered glass). In other embodiments, the substrate may be a flexible substrate including a material such as plastic or metal.

[0033] The pixel PX may be connected to the scan line SL and the data line DL. The pixel PX may be selected by a scan signal having an on level supplied through the scan line SL and receive a data signal through the data line DL. Accordingly, the pixel PX emits light having a brightness corresponding to the data signal, and an image is displayed in the display area DA.

[0034] Lines and / or built-in circuits connected to the pixels PX may be disposed in the non-display area NDA. For example, a scan driver may be disposed in the non-display area NDA.

[0035] In some embodiments, the display panel 110 may include organic light emitting diodes, inorganic light emitting diodes and / or quantum dot / well light emitting diodes as pixels PX. In other embodiments, the display panel 110 may be implemented as a liquid crystal display panel. The display device 1 may further include a light source such as a backlight unit.

[0036] The touch array 130 may include an active area SA capable of sensing a touch and a non-active area NSA located at the periphery of the active area SA. The active area SA may at least partially overlap with the display area DA.

[0037] The touch array 130 may include a substrate and touch electrodes formed on the substrate. In an embodiment, the touch electrodes may include drive electrodes TX and sense electrodes RX. The drive electrodes TX and the sense electrodes RX may be disposed on the substrate in the active area SA. In some embodiments, the substrate may be a rigid substrate including a material such as glass (e.g., tempered glass). In other embodiments, the substrate may be a flexible substrate including a material such as plastic or metal. In an embodiment, at least one layer constituting the display panel 110 may be used as a substrate of the touch array 130.

[0038] In an embodiment, the display driver 150 and the touch driver 140 of the display device 1 may be configured as separate integrated circuits (ICs). In other embodiments, the display driver 150 and the touch driver 140 may be mounted in one IC.

[0039] The display driver 150 is electrically connected to the display panel 110 to drive the pixels PX. For example, the display driver 150 may include a data driver connected to the data lines DL, a scan driver connected to the scan lines SL, and a timing controller for controlling the data driver and the scan driver. As another example, the display driver 150 may include a data driver and a timing controller, and the scan driver may be disposed in the non-display area NDA of the display panel 110.

[0040] The touch driver 140 may be connected to the touch array 130 and drive the touch array 130 using a driving signal.

[0041] The display driver 150 may display an image on the display panel 110 in units of display frames. The touch driver 140 may sense a touch in units of sensing frames. The sensing frame period and the display frame period may be synchronous or asynchronous.

[0042] Figure 2 It is a graphic Figure 1 A cross-sectional view of an embodiment of a display device shown in FIG.

[0043] refer to Figure 2 , the sensor unit (which may be provided as Figure 1 The touch array 130 shown in FIG. 1 is stacked on a display unit (which may be provided as Figure 1 ), and the window WIN may be stacked on top of the sensor unit 130.

[0044] The display unit 110 may include a display substrate 111, a circuit element layer BPL formed on the display substrate 111, and a light emitting element LD formed on the circuit element layer BPL. The circuit element layer BPL may include a scan line, a data line, and a pixel circuit (e.g., a transistor and a capacitor) for driving the light emitting element LD of the pixel PX.

[0045] An encapsulation layer (eg, thin film encapsulation layer) 120 covering the light emitting element LD may be further provided. In an embodiment, the encapsulation layer 120 may include at least one inorganic layer and at least one organic layer. According to such a configuration, the encapsulation layer 120 may protect the light emitting element LD from the external environment.

[0046] The sensor unit 130 may include a sensor SC formed on the display unit 110 and a protective layer 131 covering the sensor SC. The sensor SC may be provided as Figure 1 The encapsulation layer 120 may be used as a sensor substrate for supporting the sensor unit 130. In another embodiment, a separate sensor substrate for supporting the sensor unit 130 may be provided separately from the encapsulation layer 120.

[0047] The window WIN is a protective member disposed at the uppermost end of the display device 1, and may be a substantially transparent transmissive substrate. The window WIN may have a multilayer structure selected from a glass substrate, a plastic film, and a plastic substrate. The window WIN may include a rigid substrate or a flexible substrate, and the material constituting the window WIN is not particularly limited.

[0048] The display device 1 may further include a polarizing plate (or another anti-reflection layer) between the window WIN and the sensor unit 130 for preventing external light reflection.

[0049] Figure 3 It is a graphic Figure 1 A block diagram of an embodiment of a touch array and a touch driver is shown in FIG.

[0050] refer to Figure 3 , the touch array 300 may include first to qth driving electrodes TX1 to TXq and first to pth sensing electrodes RX1 to RXp (each of p and q is a positive integer). The first to qth driving electrodes TX1 to TXq may be connected to the first to qth driving lines TXL1 to TXLq, respectively. The first to pth sensing electrodes RX1 to RXp may be connected to the first to pth sensing lines RXL1 to RXLp, respectively. The touch array 300 may be provided as Figure 1 The first to qth driving electrodes TX1 to TXq may be provided as Figure 1 The driving electrode TX shown in FIG. 1 and the first to p-th sensing electrodes RX1 to RXp may be provided as Figure 1 The sensing electrode RX shown in .

[0051] Each of the first to qth driving electrodes TX1 to TXq may include first cells CL1 arranged in the first direction DR1 and electrically connected to each other, and each of the first to pth sensing electrodes RX1 to RXp may include second cells CL2 arranged in the second direction DR2 and electrically connected to each other. Figure 3, each of the first unit CL1 and the second unit CL2 is illustrated as having a rhombus shape. However, the embodiment is not limited thereto. For example, each of the first unit CL1 and the second unit CL2 may have at least one of various shapes such as a circular shape, other quadrilateral shapes, and a grid shape. In addition, each of the first unit CL1 and the second unit CL2 may be formed as a single layer or multiple layers. As such, the shapes and arrangements of the first to qth driving electrodes TX1 to TXq and the first to pth sensing electrodes RX1 to RXp may be variously modified.

[0052] In an embodiment, the first unit CL1 and the second unit CL2 may include at least one of various conductive materials such as a metal material and a transparent conductive material, thereby having conductivity. For example, the first unit CL1 and the second unit CL2 may include at least one of various metal materials such as gold (Au), silver (Ag), aluminum (Al), molybdenum (Mo), chromium (Cr), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and platinum (Pt), or alloys thereof.

[0053] The touch array 300 may further include input pads IPD connected to the first to qth driving lines TXL1 to TXLq. The touch driver 140 may be connected to the first to qth driving lines TXL1 to TXLq through the input pads IPD.

[0054] The touch array 300 may further include output pads OPD connected to the first to p-th sensing lines RXL1 to RXLp. The touch driver 140 may be connected to the first to p-th sensing lines RXL1 to RXLp through the output pads OPD.

[0055] The touch array 300 may include a first touch electrode and a second touch electrode that forms a mutual capacitance with the first touch electrode. The first touch electrode may be provided as the first to q-th drive electrodes TX1, TX2, TX3, ..., TX(q-1), and TXq. The second touch electrode may be provided as the first to p-th sensing electrodes RX1, RX2, ..., RX(p-2), RX(p-1), and RXp. The first to q-th drive electrodes TX1 to TXq may extend in the first direction DR1 and be arranged to be spaced apart from each other in the second direction DR2. The first to p-th sensing electrodes RX1 to RXp may extend in the second direction DR2 and be arranged to be spaced apart from each other in the first direction DR1. The first to p-th sensing electrodes RX1 to RXp may be electrically separated from the first to q-th drive electrodes TX1 to TXq while crossing the first to q-th drive electrodes TX1 to TXq to form a mutual capacitance with the first to q-th drive electrodes TX1 to TXq.

[0056] When a touch is provided to the touch array 300, one or more of the mutual capacitances may be changed. For example, the touch may include at least one of various types of inputs such as physical contact and hovering that cause a change in the mutual capacitance. The touch driver 140 may sense the change in the mutual capacitance, thereby recognizing the touch.

[0057] The touch driver 140 may be connected to the first to qth driving electrodes TX1 to TXq through the first to qth driving lines TXL1 to TXLq. The touch driver 140 may be connected to the first to pth sensing electrodes RX1 to RXp through the first to pth sensing lines RXL1 to RXLp.

[0058] The touch driver 140 may sense sensing signals from the first to pth sensing electrodes RX1 to RXp through the first to pth sensing lines RXL1 to RXLp while applying driving signals to the first to qth driving electrodes TX1 to TXq through the first to qth driving lines TXL1 to TXLq. The touch driver 140 may sense changes in mutual capacitance based on the sensing signals.

[0059] Figure 1 The display device 1 shown in the figure can transmit signals with an external device through the first to qth driving electrodes TX1 to TXq and the first to pth sensing electrodes RX1 to RXp. For example, when the external device is adjacent to the touch array 300, the touch driver 140 can supply uplink signals through the first to qth driving electrodes TX1 to TXq and the first to pth sensing electrodes RX1 to RXp, and the external device can receive (or obtain) at least some of the uplink signals. In an embodiment, the uplink signal can refer to the transmission of data from a smaller or auxiliary network communication device or base station to a larger or primary network communication device or base station. This is typically from a client device (such as a mobile phone or computer) to a server or a primary network (such as a satellite or base station).

[0060] Figure 4 It is a graphic Figure 1 A block diagram of an embodiment of a display panel and a display driver is shown in FIG.

[0061] refer to Figure 4 , the display device 1 may include a display panel 110 and a display driver 150 .

[0062] The display panel 110 may include pixels PX and data lines D1 to Dm (which may be provided as Figure 1 ) and scan lines S1 to Sj (which may be provided as Figure 1 , wherein m and j are each a positive integer.

[0063] The display panel 110 may include a display area DA for displaying an image and a non-display area NDA located at the periphery of the display area DA. The non-display area NDA may at least partially surround the display area DA.

[0064] Each of the pixels PX may be connected to a first power source ELVDD and a second power source ELVSS.

[0065] The pixel PX may include a light emitting element (eg, Figure 2 LD shown in ). Each pixel PX can control the current flowing from the first power source ELVDD to the second power source ELVSS via the light emitting element according to the data signal supplied through the corresponding data line, and the light emitting element can generate light according to the controlled current. The first power source ELVDD can supply a high potential voltage, and the second power source ELVSS can supply a low potential voltage.

[0066] The display driver 150 may include a timing controller 151 , a data driver 152 , and a scan driver 153 .

[0067] The timing controller 151 may generate a control signal for controlling the scan driver 153 and the data driver 152 in response to a control signal from the outside. For example, the control signal from the outside may include a data enable signal DE and a vertical synchronization signal Vsync. For example, the timing controller 151 may control the scan driver 153 by outputting a scan driver control signal SCS to the scan driver 153 in response to a control signal from the outside. The timing controller 151 may control the data driver 152 by outputting a data driver control signal DCS to the data driver 152 in response to a control signal from the outside.

[0068] The timing controller 151 may convert first image data DATA1 input from the outside into second image data DATA2 suitable for the specification of the data driver 152 and then supply the second image data DATA2 to the data driver 152 .

[0069] The first image data DATA1 may include brightness information of each of the pixels PX of the display panel 110. The first image data DATA1 may be divided in units of display frames.

[0070] The data enable signal DE may be a signal for defining a period in which valid data is input.

[0071] The data driver 152 may generate a data signal according to the data driver control signal DCS and the second image data DATA2 input from the timing controller 151. The data driver 152 may supply the generated data signal to the data lines D1 to Dm.

[0072] In order for the data driver 152 to be connected to the data lines D1 to Dm, the data driver 152 may be directly mounted on a substrate on which the pixels PX are formed, or may be connected to the substrate on which the pixels PX are formed through a separate component such as a flexible circuit board.

[0073] When the scan signal is supplied to each scan line, the pixel PX connected to the corresponding scan line may be supplied with the data signal transmitted from the data lines D1 to Dm. The corresponding pixel PX may emit light having brightness corresponding to the supplied data signal.

[0074] The scan driver 153 may supply the scan signals to the scan lines S1 to Sj in response to the scan driver control signal SCS. For example, the scan driver 153 may sequentially supply the scan signals to the scan lines S1 to Sj.

[0075] In order for the scan driver 153 to be connected to the scan lines S1 to Sj, the scan driver 153 may be directly mounted on a substrate on which the pixels PX are formed, or may be connected to the substrate on which the pixels PX are formed through a separate component such as a flexible circuit board.

[0076] exist Figure 4 1 and 2 illustrate that the timing controller 151, the data driver 152, and the scan driver 153 are components separated from each other. However, in some embodiments, at least some of these components may be integrated.

[0077] Figure 5 is a block diagram illustrating an embodiment of a display system including a display device.

[0078] refer to Figure 5 The display system includes a display device 1, a host 60 and an external device 500.

[0079] The display device 1 may include a panel 10, a touch driver 140, and a display driver 150. The panel 10 may include a display panel 110 and a touch array 130. The touch array 130 may include sensing electrodes RX and driving electrodes TX.

[0080] The external device 500 may include a processor 510, a position sensor 520, a function block 530, a communication interface 540, and a receiving electrode 550. In an embodiment, the external device 500 may include an active pen.

[0081] The functional block 530 may include a display module configured to display an image, a motor or a propeller for physically moving the external device 500 , and the like.

[0082] In an embodiment, the display driver 150 may periodically transmit the vertical synchronization signal Vsync and / or information about the vertical synchronization signal Vsync to the touch driver 140 .

[0083] Reference together Figure 5 and Figure 3 , the first to p-th sensing electrodes RX1 to RXp and the first to q-th driving electrodes TX1 to TXq cross each other. Each sensing electrode RX and each driving electrode TX may be electrically separated from each other, and accordingly, mutual capacitance may be defined or formed between each sensing electrode RX and each driving electrode TX. In this way, mutual capacitance may be formed at positions where the first to p-th sensing electrodes RX1 to RXp and the first to q-th driving electrodes TX1 to TXq cross each other.

[0084] When a touch is provided to the touch array 130 , one or more of the mutual capacitances may be altered.

[0085] The touch may include at least one of various types of inputs such as physical contact and hovering that cause a change in mutual capacitance. The touch driver 140 may sense the change in mutual capacitance, thereby recognizing the touch.

[0086] The touch driver 140 may encode data representing each touch electrode (or the position of each touch electrode), and output the encoded data signal as an uplink signal to the external device 500 through the corresponding touch electrode. For example, the touch driver 140 may encode data corresponding to each of the first to q-th driving electrodes TX1 to TXq, and output the encoded data signal as an uplink signal through the corresponding driving electrode. In other words, the touch driver 140 may encode data corresponding to the first driving electrode TX1, and then send the encoded data signal as an uplink signal to the external device 500 via the first touch electrode TX1. In addition, the touch driver 140 may encode data corresponding to each of the first to p-th sensing electrodes RX1 to RXp, and output the encoded data signal as an uplink signal through the corresponding sensing electrode. In other words, the touch driver 140 may encode data corresponding to the first sensing electrode RX1, and then send the encoded data signal as an uplink signal to the external device 500 via the first sensing electrode RX1. Accordingly, uplink signals representing different positions may be output through the corresponding touch electrodes.

[0087] In an embodiment, the encoded data signal and the uplink signal may further include information about the vertical synchronization signal Vsync, information about the panel 10, and protocol version information, etc. The external device 500 can obtain the information about the vertical synchronization signal Vsync from the uplink signal, and determine the transmission time of the downlink signal according to the obtained information. In addition, the external device 500 can check the information about the panel 10 or the protocol version from the uplink signal.

[0088] The receiving electrode 550 of the external device 500 may be connected to the communication interface 540. When the receiving electrode 550 is adjacent to the touch array 130, a capacitor having a relatively low capacitance may be formed between at least some of the sensing electrodes RX and the receiving electrode 550 and between at least some of the driving electrodes TX and the receiving electrode 550. The external device 500 may communicate an uplink signal and / or a downlink signal with the corresponding sensing electrode and / or the corresponding driving electrode through the capacitor having a relatively low capacitance.

[0089] The communication interface 540 may amplify the received signal. For example, the communication interface 540 may amplify the signal received through the receiving electrode 550 in the uplink process. For example, the communication interface 540 may amplify the signal received from the position sensor 520 in the downlink process.

[0090] The communication interface 540 may be configured to convert an analog signal into a digital signal, and convert a digital signal into an analog signal. For example, the communication interface 540 may convert an analog signal (e.g., an uplink signal) received by the receiving electrode 550 into a digital signal, and provide the converted digital signal to the position sensor 520. For example, the communication interface 540 may convert a digital signal received from the position sensor 520 into an analog signal (e.g., a downlink signal), and output the converted analog signal through the receiving electrode 550.

[0091] The processor 510 may be configured to control the overall operation of the external device 500. For example, the processor 510 may control the position sensor 520. For example, the processor 510 may control the operation of the position sensor 520 by transmitting a position sensor control signal to the position sensor 520.

[0092] The position sensor 520 may calculate position information by decoding a signal received from the communication interface 540 .

[0093] The processor 510 may receive position information from the position sensor 520. In an embodiment, the processor 510 may transmit the received position information to the functional block 530. The functional block 530 may perform several functions by using the received position information. For example, the functional block 530 may include a display module. The functional block 530 may visualize the received position information. In another example, the functional block 530 may be a motor for moving the external device 500 in a specific direction. The functional block 530 may allow the external device 500 to be moved by driving the motor according to the received position information.

[0094] In an embodiment, the processor 510 may control the position sensor 520 and the communication interface 540 to transmit the position information to the display device 1 in the form of a downlink signal. The position sensor 520 may encode the position information and provide the encoded data signal including the position information to the communication interface 540. The communication interface 540 may transmit the encoded data signal as a downlink signal to the touch array 130 through the receiving electrode 550. The display device 1 may receive the downlink signal through a touch electrode adjacent to the receiving electrode 550 among the sensing electrode RX and the driving electrode TX of the touch array 130.

[0095] In an embodiment, the downlink signal may further include status information of the external device 500. For example, when the external device 500 is an active pen, the status information may further include information about at least one of a button status of the active pen, a battery status of the active pen, and a tilt of the active pen when the active pen contacts the touch array 130, etc.

[0096] The touch driver 140 may receive a downlink signal through the touch array 130. The touch driver 140 may extract the position information of the external device 500 by decoding the downlink signal. In an embodiment, the downlink signal may further include state information associated with the external device 500. The touch driver 140 may further extract the state information of the external device 500 by decoding the downlink signal. The touch driver 140 may transmit the extracted position information and the extracted state information to the host 60. In some embodiments, the display device 1 and the host 60 may perform wired communication with each other. In other embodiments, the display device 1 and the host 60 may perform wireless communication with each other.

[0097] Figure 6 It is shown in Figure 5 A block diagram of the process of transmitting uplink signals in a display system is shown in FIG.

[0098] refer to Figure 6, the touch driver 140 may encode data indicating the position of each of the sensing electrodes RX and each of the driving electrodes TX, and output the encoded data signal US1 as the uplink signal US2 to the external device 500 through the corresponding touch electrodes. Figure 3 The touch driver 140 encodes data corresponding to each of the first to q-th driving electrodes TX1 to TXq shown in FIG. 1 and outputs the encoded data signal US1 as the uplink signal US2 through the corresponding driving electrode. In other words, the uplink signal US2 including the encoded data signal US1 of the q-th driving electrode TXq can be output from the q-th driving electrode TXq to the receiving electrode 550 of the external device 500. In addition, the touch driver 140 can Figure 3 , and the encoded data signal US1 is output as the uplink signal US2 through the corresponding sensing electrode. In other words, the uplink signal US2 including the encoded data signal US1 of the p-th sensing electrode RXp can be output from the p-th sensing electrode RXp to the receiving electrode 550 of the external device 500. Accordingly, the uplink signal US2 representing different positions can be output through the corresponding touch electrode.

[0099] In an embodiment, the touch driver 140 may output the uplink signal US2 when the external device 500 is adjacent to the touch array 130. For example, when the external device 500 senses that the mutual capacitance between the sensing electrode RX and the driving electrode TX is changed while the external device 500 is adjacent to the touch array 130, the touch driver 140 may output the uplink signal US2.

[0100] In an embodiment, the display driver 150 may periodically transmit a vertical synchronization signal Vsync and / or information about the vertical synchronization signal Vsync to the touch driver 140. The touch driver 140 may output an uplink signal US2 through the sensing electrode RX and the driving electrode TX with reference to the vertical synchronization signal Vsync.

[0101] When the external device 500 approaches the touch array 130, the external device 500 may receive the uplink signal US2 from at least some of the sensing electrodes RX and at least some of the driving electrodes TX. When the external device 500 approaches the touch array 130, an electric field may be generated between the receiving electrode 550 and the touch array 130. Since the electric field is formed, a virtual capacitor may be formed between at least some of the sensing electrodes RX and the receiving electrode 550 and between at least some of the driving electrodes TX and the receiving electrode 550. As the external device 500 approaches the corresponding touch electrode, the impedance of the virtual capacitor may become smaller. As the impedance of the virtual capacitor becomes smaller, the uplink signal US2 may be transmitted from the corresponding touch electrode to the receiving electrode 550 more smoothly. For example, the external device 500 may receive the uplink signal US2 from the adjacent driving electrode among the first to qth driving electrodes TX1 to TXq, and receive the uplink signal US2 from the adjacent sensing electrode among the first to pth sensing electrodes RX1 to RXp. The external device 500 can obtain the position data of the corresponding driving electrode and the position data of the corresponding sensing electrode by decoding the received uplink signal US2. In this way, the external device 500 decodes the received uplink signal US2, thereby calculating the position information (i.e., touch position information) of the external device 500 on the touch array 130. In other words, the external device 500 can calculate its own position information.

[0102] The communication interface 540 may receive the uplink signal US2 through the receiving electrode 550. The communication interface 540 may transmit the uplink signal US2 to the position sensor 520 in the form of an input signal IS.

[0103] The position sensor 520 can obtain the touch position information of the external device 500 on the touch array 130 by decoding the input signal IS. In other words, the position sensor 520 can obtain the touch position information of the external device 500 on the touch array 130 by decoding the input signal IS.

[0104] In an embodiment, the external device 500 may include a communication device supporting wireless communication such as Bluetooth communication, and the processor 510 may transmit the touch position information to the host 60 through wireless communication using the communication device.

[0105] In an embodiment, the host 60 may be included in a computing device such as a computer (eg, a notebook computer), a mobile phone, a smart phone, or a wearable device together with the display device 1. The host 60 may perform various operations by using the touch position information.

[0106] In addition, the external device 500 may perform various operations by using the touch position information. For example, the external device 500 may include a function block 530 for performing various operations, and the function block 530 may receive the touch position information from the processor 510. The function block 530 may perform various operations by using the touch position information.

[0107] Figures 7 to 9 is a timing diagram illustrating an embodiment of an uplink signal in a first time period.

[0108] exist Figures 7 to 9 In the embodiment, the display device 1 and the external device 500 may communicate with each other in units of frames or in units of data packets, and a first frame may include a first time period TP1 in which an uplink signal is transmitted and a second time period TP2 in which a downlink signal is transmitted (see Fig.13 ). It should be understood that the second frame after the first frame may also include the first time period TP1. In addition, the second frame may further include the second time period TP2 after the first time period TP1. In this way, the communication between the display device 1 and the external device 500 may include a plurality of frames, and each frame may include the first time period TP1 and the second time period TP2. However, for ease of description, the first time period TP1 in which the uplink signal is transmitted among the plurality of time periods of the frame is illustrated. Fig.13 The second period TP2 is described in detail.

[0109] For example, in the first time period TP1, the display device 1 may transmit a beacon signal as an uplink signal to the external device 500. The display device 1 may select a protocol and control the timing according to the beacon signal. In addition, after the external device 500 receives the beacon signal normally, the external device 500 may calculate information according to the beacon signal. For example, the beacon signal is a signal periodically transmitted from the touch array 130, and may include at least one of panel information (e.g., panel status information and panel identification information, etc.) and characteristic information of the downlink signal (e.g., frequency and voltage level, etc.). The beacon signal may further include information for driving synchronization between the touch array 130 and the external device 500. In other words, the beacon signal may also include information for synchronizing the touch array 130 with the external device 500.

[0110] refer to Figure 3 and Figure 7 The first time period TP1 may include a first sub-time period 710 and a second sub-time period 720 after a period in which a beacon signal is transmitted, in which an uplink signal including position information of driving electrodes TX1 to TXq is transmitted in the first sub-time period 710, and in which an uplink signal including position information of sensing electrodes RX1 to RXp is transmitted in the second sub-time period 720.

[0111] For example, in the first sub-period 710, the display device 1 may transmit uplink signals US1_TX1 to US1_TXq corresponding to the driving electrodes TX1 to TXq, respectively, to the external device 500. In the second sub-period 720 after the first sub-period 710, the display device 1 may transmit uplink signals US1_RX1 to US1_RXp corresponding to the sensing electrodes RX1 to RXp, respectively, to the external device 500. Each uplink signal may have an electrical pulse form including a digital component representing position information of the corresponding touch electrode. In other words, each uplink signal may include a plurality of pulses having different forms.

[0112] refer to Figure 3 and Figure 8 , the first time period TP1 may include a first sub-time period 810 and a second sub-time period 820 after the period in which the beacon signal is transmitted, in which an uplink signal including position information of selected driving electrodes TX1, TX3, TX5, ..., and TX(2N-1) (N is a positive integer) among the driving electrodes TX1 to TXq and selected sensing electrodes RX1, RX3, RX5, ..., and RX(2N-1) among the sensing electrodes RX1 to RXp is transmitted in the first sub-time period 810, and an uplink signal including position information of selected driving electrodes TX2, TX4, TX6, ..., and TX(2N) among the driving electrodes TX1 to TXq and selected sensing electrodes RX2, RX4, RX6, ..., and RX(2N) among the sensing electrodes RX1 to RXp is transmitted in the second sub-time period 820.

[0113] For example, in the first sub-time period 810, the display device 1 may transmit uplink signals US1_TX1, US1_TX3, US1_TX5, …, and US1_TX(2N-1) and US1_RX1, US1_RX3, US1_RX5, …, and US1_RX(2N-1) corresponding to the selected driving electrodes TX1, TX3, TX5, …, and TX(2N-1) among the driving electrodes TX1 to TXq and the selected sensing electrodes RX1, RX3, RX5, …, and RX(2N-1) among the sensing electrodes RX1 to RXp to the external device 500. In a second sub-time period 820 after the first sub-time period 810, the display device 1 may transmit uplink signals US1_TX2, US1_TX4, US1_TX6, …, and US1_TX(2N) and US1_RX2, US1_RX4, US1_RX6, …, and US1_RX(2N) corresponding to the selected driving electrodes TX2, TX4, TX6, …, and TX(2N) among the driving electrodes TX1 to TXq and the selected sensing electrodes RX2, RX4, RX6, …, and RX(2N) among the sensing electrodes RX1 to RXp to the external device 500.

[0114] refer to Figure 3 and Fig. 9 , the first time period TP1 may include a first sub-time period 910, a second sub-time period 920, a third sub-time period 930 and a fourth sub-time period 940 after the time period in which the beacon signal is transmitted, in the first sub-time period 910, an uplink signal including position information of selected driving electrodes TX1, TX3, TX5, ..., and TX(2N-1) among the driving electrodes TX1 to TXq is transmitted, in the second sub-time period 920, an uplink signal including position information of other driving electrodes TX2, TX4, TX6, ..., and TX(2N) among the driving electrodes TX1 to TXq is transmitted, in the third sub-time period 930, an uplink signal including position information of selected sensing electrodes RX1, RX3, RX5, ..., and RX(2N-1) among the sensing electrodes RX1 to RXp is transmitted, and in the fourth sub-time period 940, an uplink signal including position information of other sensing electrodes RX2, RX4, RX6, ..., and RX(2N) among the sensing electrodes RX1 to RXp is transmitted.

[0115] For example, in the first sub-period 910, the display device 1 may transmit uplink signals US1_TX1, US1_TX3, US1_TX5, ..., and US1_TX(2N-1) corresponding to the selected driving electrodes TX1, TX3, TX5, ..., and TX(2N-1), respectively, to the external device 500. In the second sub-period 920 after the first sub-period 910, the display device 1 may transmit uplink signals US1_TX2, US1_TX4, US1_TX6, ..., and US1_TX(2N) corresponding to the other driving electrodes TX2, TX4, TX6, ..., and TX(2N), respectively, to the external device 500. In a third sub-period 930 after the second sub-period 920, the display device 1 may transmit uplink signals US1_RX1, US1_RX3, US1_RX5, ..., and US1_RX(2N-1) corresponding to the selected sensing electrodes RX1, RX3, RX5, ..., and RX(2N-1), respectively, to the external device 500. In a fourth sub-period 940 after the third sub-period 930, the display device 1 may transmit uplink signals US1_RX2, US1_RX4, US1_RX6, ..., and US1_RX(2N) corresponding to the other sensing electrodes RX2, RX4, RX6, ..., and RX(2N), respectively, to the external device 500.

[0116] As such, the first time period TP1 may be divided into n (n is a positive integer) sub-time periods after the time period in which the beacon signal is transmitted. In addition, the driving electrodes TX and the sensing electrodes RX are grouped differently, and an uplink signal may be transmitted through a group of touch electrodes in each sub-time period.

[0117] Fig.10 is a diagram illustrating an external device, a touch array, and a capacitor formed between the external device and the touch array.

[0118] The external device 500 may include an active pen.

[0119] refer to Fig.10 , describes the operation of an active pen receiving an uplink signal through a capacitor generated between the active pen and an adjacent touch electrode.

[0120] like Fig.10As shown in , the touch driver 140 can apply uplink signals US1_TX1 to US1_TX9 including different position information to the drive electrodes TX1 to TX9 of the touch array 130 through the first channel CH1. For example, the uplink signal US1_TX1 may include the position information of the drive electrode TX1, and the uplink signal US1_TX2 may include the position information of the drive electrode TX2. The position information of the drive electrode TX1 is different from the position information of the drive electrode TX2. In addition, the active pen can transmit the uplink signal through the capacitor generated between the active pen and the adjacent touch electrodes TX3 to TX7. In addition, the active pen can obtain the capacitance information of the capacitors 1010, 1020, 1030, 1040 and 1050 generated between the active pen and the corresponding touch electrode from the transmitted uplink signal. For example, the capacitance information of the capacitor 1010 generated between the drive electrode TX5 of the fifth column that is most adjacent to the active pen and the active pen can be included in the uplink signal transmitted from the drive electrode TX5 of the fifth column. The uplink signals transmitted from the adjacent touch electrodes TX3 to TX7 may include digital components including different position information of uplink signals US1_TX1 to US1_TX9 and analog components of capacitance information of capacitors 1010 to 1050. In other words, the uplink signals may include digital components and capacitance information.

[0121] In an embodiment, the position sensor 520 of the active pen can decode the uplink signal received from the adjacent driving electrodes TX3 to TX7 and calculate the position information of the active pen by applying a predetermined algorithm. The position information of the active pen can be calculated based on the digital components included in the uplink signals US1_TX1 to US1_TX9 including different position information. For example, the position sensor 520 can calculate the position information of the active pen by estimating the feature vector based on the decoded uplink signal and assigning a predetermined relative weight value to each of the feature vectors.

[0122] However, despite Fig.10 , nine driving electrodes TX1 to TX9 are described as an example, but the present disclosure is not limited to this number of driving electrodes. In addition, the description of the driving electrodes can be equally applied to the sensing electrodes.

[0123] Fig.11 is the diagram being applied to Fig.10 2 is a timing diagram of signals of some of the touch electrodes shown in .

[0124] refer to Fig.11 Descriptions are applied to Fig.10, the uplink signals US1_TX3 to US1_TX7 of the drive electrodes TX3 to TX7 adjacent to the external device 500 shown in . The uplink signal may be a signal of a digital component generated by performing encoding and modulation based on different position information. The uplink signal may be a pulse signal of different forms including 1 or 0 in a plurality of bit streams. For example, the uplink signal US1_TX3 applied to the drive electrode TX3 located in the third column may be a signal including a digital component of 101010101. The uplink signal US1_TX4 applied to the drive electrode TX4 located in the fourth column may be a signal including a digital component of 001001100. The uplink signal US1_TX5 applied to the drive electrode TX5 located in the fifth column may be a signal including a digital component of 010101010. The uplink signal US1_TX6 applied to the drive electrode TX6 located in the sixth column may be a signal including a digital component of 001100110. The uplink signal US1_TX7 applied to the driving electrode TX7 located in the seventh column may be a signal including a digital component of 110011001. However, although an example in which the uplink signal includes different position information is described, the present disclosure is not limited thereto.

[0125] Fig.12 It is shown in Figure 5 The block diagram shown in FIG. 1 shows the process of transmitting downlink signals in the display system.

[0126] refer to Fig.12 The display device 1 may include a touch driver 140, a display driver 150, and a panel 10. The panel 10 may include a touch array 130 and a display panel 110. The touch array 130 may include sensing electrodes RX and driving electrodes TX. Figure 5 and Figure 6 The parts are the same as those shown in the description.

[0127] The position sensor 520 may calculate touch position information by decoding a signal received from the communication interface 540 .

[0128] The processor 510 may receive the position information PI from the position sensor 520. In an embodiment, the processor 510 may transmit the received position information PI to the function block 530.

[0129] Functional block 530 can perform several functions by using the received position information PI. For example, functional block 530 may include a display module. Functional block 530 can visualize the received position information PI. In another example, functional block 530 may include a motor for moving external device 500 in a specific direction. Functional block 530 can allow external device 500 to be moved by driving the motor according to the received position information PI.

[0130] In an embodiment, the processor 510 may control the position sensor 520 and the communication interface 540 to transmit the position information PI in the form of a downlink signal DS1 to the display device 1. The position sensor 520 may provide the position information PI to the communication interface 540 in the form of an output signal OS.

[0131] The communication interface 540 may amplify the output signal OS and convert the amplified output signal OS into a downlink signal DS1. In addition, the communication interface 540 may output the downlink signal DS1 to the touch array 130 through the receiving electrode 550. The display device 1 may receive the downlink signal DS1 through a touch electrode adjacent to the receiving electrode 550 among the sensing electrode RX and the driving electrode TX.

[0132] The touch driver 140 may receive the downlink signal DS2 through the touch array 130. The touch driver 140 may extract the position information PI of the external device 500 by decoding the downlink signal DS2.

[0133] In an embodiment, the downlink signal DS2 may further include state information SI associated with the external device 500. The touch driver 140 may further extract the state information SI of the external device 500 by decoding the downlink signal DS2. In an embodiment, when the external device 500 is an active pen, the state information SI may further include information about at least one of a button state of the active pen, a battery state of the active pen, and a tilt of the active pen when the active pen contacts the touch array 130, etc.

[0134] The touch driver 140 may transmit the extracted position information PI and the extracted state information SI to the host 60. In some embodiments, the display device 1 and the host 60 may perform wired communication with each other. In other embodiments, the display device 1 and the host 60 may perform wireless communication with each other.

[0135] Fig.13 is a timing diagram illustrating an embodiment of an uplink signal in a first time period and a downlink signal in a second time period.

[0136] refer to Fig.13, the communication between the display device 1 and the external device 500 may include a plurality of frames, and each frame may include a first time period TP1 in which an uplink signal is transmitted and a second time period TP2 in which a downlink signal is transmitted.

[0137] like Fig.13 As shown in FIG. 1 , in a first time period TP1, an uplink signal 1310 may be transmitted to the external device 500 through the touch array 130. In a second time period TP2 after the first time period TP1, a downlink signal 1320 may be transmitted from the external device 500 through the touch array 130. For example, the position sensor 520 of the external device 500 may calculate the position information 1322 of the external device 500 by using the received uplink signal. In the second time period TP2, the position sensor 520 of the external device 500 may transmit the downlink signal 1320 including the position information of the external device 500 to the display device 1. The downlink signal 1320 may be transmitted through a capacitor generated between the external device 500 and the adjacent touch electrode.

[0138] The downlink signal 1320 may include state information 1321 of the external device and position information 1322 of the external device. For example, when the external device 500 is an active pen, the state information 1321 of the external device may include information about at least one of a button state of the active pen, a battery state of the active pen, and a tilt of the active pen when the active pen contacts the touch array 130, and / or information for error checking and correction.

[0139] Fig.14 is a flowchart illustrating a method of driving a display device according to an embodiment of the present disclosure.

[0140] refer to Figure 6 , Fig.12 and Fig.14 In step S1410, a touch adjacent to the touch array 130 may be sensed.

[0141] In step S1420, an uplink signal US2 including different position information may be generated. For example, data indicating the position of each touch electrode may be encoded to generate an encoded data signal US1. The encoded data signal US1 may further include information about the vertical synchronization signal Vsync, information about the panel 10, and protocol version information, etc.

[0142] In step S1430 , the uplink signal US2 may be transmitted to the external device 500 through the sensing electrode RX and the driving electrode TX.

[0143] In step S1440 , the display device 1 may receive the position information PI of the external device 500 on the touch array 130 , which is calculated by the external device 500 , in the form of a downlink signal DS1 .

[0144] In an embodiment, the downlink signal DS1 may further include state information SI of the external device 500. For example, the external device 500 is an active pen, and the state information SI may further include information about at least one of a button state of the active pen, a battery state of the active pen, and a tilt of the active pen when the active pen contacts the touch array 130, etc.

[0145] In step S1450, the display device 1 may extract the position information PI of the external device 500 by decoding the downlink signal DS2. When the downlink signal DS2 further includes the state information SI associated with the external device 500, the display device 1 may further extract the state information SI of the external device 500 by decoding the downlink signal DS2. In addition, the display device 1 may transmit the extracted position information PI and the extracted state information SI to the host 60. In some embodiments, the display device 1 and the host 60 may perform wired communication with each other. In other embodiments, the display device 1 and the host 60 may perform wireless communication with each other.

[0146] According to the present disclosure, a display device, a method of driving the display device, and a display system including the display device are provided, which are capable of efficiently and effectively acquiring position information of an external device located above the display device.

[0147] Although various embodiments of the present disclosure have been described herein, these embodiments are interpreted only in a general and descriptive sense and not for limiting purposes. In some cases, unless otherwise specifically indicated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Accordingly, those skilled in the art will appreciate that various modifications may be made in form and detail without departing from the spirit and scope of the present disclosure as set forth in the claims.

Claims

1. A display device, include: A touch array, comprising a plurality of touch electrodes; as well as a touch driver configured to sense a touch adjacent to the touch array, wherein the touch driver transmits an uplink signal including different position information to an external device through at least some of the touch electrodes in a first time period, and receives position information of the external device on the touch array from the external device in a second time period after the first time period, and The location information of the external device is calculated by the external device using the uplink signal.

2. The display device according to claim 1, in, The touch driver receives a downlink signal including the position information of the external device through at least some of the touch electrodes, and acquires the position information of the external device by decoding the downlink signal.

3. The display device according to claim 2, in, The external device is an active pen, and The downlink signal further includes information about at least one of a button state of the active pen, a tilt of the active pen, and a battery state of the active pen.

4. The display device according to claim 1, in, The touch driver is further configured to communicate with a host, and The touch driver transmits the position information of the external device to the host.

5. The display device according to claim 1, in, The touch electrodes include sensing electrodes arranged in a first direction and driving electrodes arranged in a second direction crossing the first direction.

6. The display device according to claim 5, in, The touch driver generates the uplink signal by encoding position information corresponding to the sensing electrodes and the driving electrodes.

7. The display device according to any one of claims 1 to 6, in, The touch driver transmits a first portion of the uplink signal to the external device through the touch electrode in a first sub-time period of the first time period, and transmits a second portion of the uplink signal to the external device through the touch electrode in a second sub-time period of the first time period.

8. A method for driving a display device including a touch array, the method include: sensing a touch adjacent to the touch array; transmitting an uplink signal including different position information to an external device through the touch electrodes of the touch array in a first time period; as well as receiving position information of the external device on the touch array from the external device in a second time period after the first time period, The position information of the external device on the touch array is calculated by the external device using the uplink signal.

9. The method according to claim 8, in, The receiving comprises: receiving a downlink signal including the position information of the external device through at least some of the touch electrodes; and The location information of the external device is acquired by decoding the downlink signal.

10. The method according to claim 9, in, The external device is an active pen, and The downlink signal further includes information about at least one of a button state of the active pen, a tilt of the active pen, and a battery state of the active pen.

11. The method according to claim 8, further comprising: include: The location information of the external device is transmitted to a host.

12. The method according to claim 8, in, The touch electrodes include sensing electrodes arranged in a first direction and driving electrodes arranged in a second direction crossing the first direction, and Wherein, in the transmission, the uplink signal is generated by encoding position information corresponding to the sensing electrode and the driving electrode.

13. The method according to any one of claims 8 to 12, in, The transmission includes: In a first sub-period of the first period, transmitting a first portion of the uplink signal to the external device through the touch electrode; and In a second sub-period of the first period, a second portion of the uplink signal is transmitted to the external device through the touch electrode.

14. A display system, include: A display device comprising a touch array and a touch driver, the touch array comprising a plurality of touch electrodes, the touch driver configured to sense a touch adjacent to the touch array; as well as an external device configured to communicate with the display device through the touch array, Wherein, the touch driver: When the external device is adjacent to the touch array, transmitting an uplink signal including different position information to the external device through one or more capacitors generated between at least some of the touch electrodes and the external device in a first time period; and receiving a downlink signal including location information of the external device from the external device in a second time period after the first time period, and The external device includes a position sensor configured to calculate the position information of the external device on the touch array using the uplink signal.

15. The display system according to claim 14, in, The touch driver generates the uplink signal by encoding position information corresponding to the touch electrode, wherein the external device receives the uplink signal from a touch electrode adjacent to the external device among the touch electrodes, and The position sensor calculates the position information of the external device by decoding the received uplink signal.

16. The display system according to claim 14, in, The touch driver is further configured to provide the position information of the external device to a host.

17. The display system according to claim 16, in, The touch driver is further configured to provide status information of the external device to the host.

18. The display system according to claim 14, in, The touch array overlaps with the display panel of the display device.

19. The display system according to any one of claims 14 to 18, in, The external device further includes a processor and a functional block configured to visualize the position information of the external device on the touch array.

20. The display system according to claim 19, in, The functional block includes a motor that moves the external device.

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