Display device

Abstract

A display device includes: a display unit including a plurality of pixels connected to an initialization line and a first power supply line; a sensor unit provided on the display unit and including a plurality of driving electrodes; a sensor driver supplying a touch driving voltage to a plurality of driving lines connected to the plurality of driving electrodes; a power supply that supplies an initialization voltage to the initialization line and supplies a first power supply voltage to the first power supply line; and a compensation circuit that compensates for the initialization voltage.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0108422, filed on August 18, 2023, which is hereby incorporated by reference. Technical Field

[0003] One or more embodiments described herein relate to a display device. Background Art

[0004] As information technology develops, the importance of display devices as a connection medium between users and information is being highlighted. In response to this, the use of display devices such as liquid crystal display devices and organic light emitting display devices is increasing.

[0005] The display device includes a display panel for displaying an image and various input devices. In addition, the display device may include a touch sensor for sensing a touch input. Accordingly, the display device may operate in a display driving mode for displaying an image and a touch driving mode for sensing a touch input. Summary of the invention

[0006] The embodiment provides a display device that prevents degradation of image quality due to influence of touch driving on display driving.

[0007] According to one embodiment of the present disclosure, a display device may include: a display unit including a plurality of pixels connected to an initialization line and a first power line; a sensor unit provided on the display unit and including a plurality of driving electrodes; a sensor driver providing a touch driving voltage to a plurality of driving lines connected to the plurality of driving electrodes; a power supply providing an initialization voltage to the initialization line and providing a first power voltage to the first power line; and a compensation circuit compensating for the initialization voltage.

[0008] The compensation circuit may change the initialization voltage in response to a change in the first power supply voltage.

[0009] The compensation circuit may be connected between the plurality of driving lines and the initialization line.

[0010] The compensation circuit may include a resistor and a compensation capacitor connected in series.

[0011] The capacitance of the compensation capacitor may be the same as the capacitance of the capacitor formed between the plurality of driving lines and the first power line.

[0012] The initialization voltage may be changed by a voltage corresponding to an amount of charge corresponding to a product of the capacitance of the compensation capacitor and the touch driving voltage.

[0013] The change amount of the initialization voltage may be the same as the change amount of the first power supply voltage.

[0014] Each of the plurality of pixels may include: a first transistor including a gate electrode connected to a first node, a first electrode connected to a second node, and a second electrode connected to a third node; a second transistor including a gate electrode connected to a first scan line, a first electrode connected to a data line, and a second electrode connected to a second node; a third transistor including a gate electrode connected to the first scan line, a first electrode connected to the first node, and a second electrode connected to the third node; a fourth transistor including a gate electrode connected to the second scan line, a first electrode connected to the first node, and a second electrode connected to an initialization line or a fourth node; a fifth transistor including a gate electrode connected to an emission control line, a first electrode connected to a second power line, and a second electrode connected to the second node; a sixth transistor including a gate electrode connected to the emission control line, a first electrode connected to the third node, and a second electrode connected to a fifth node; a seventh transistor including a gate electrode connected to the third scan line, a first electrode connected to the initialization line, and a second electrode connected to the fifth node; and a light-emitting element including an anode electrode connected to the fifth node and a cathode electrode connected to the first power line.

[0015] The anode electrode may be initialized to a compensated initialization voltage in response to the seventh transistor being turned on.

[0016] The sensor unit may further include a plurality of sensing electrodes, and the sensor driver may receive touch sensing signals from a plurality of sensing lines connected to the plurality of sensing electrodes.

[0017] According to one embodiment of the present disclosure, a display device operating in a display drive period and a touch drive period overlapping at least a portion of the display drive period may include: a plurality of drive lines connected to a plurality of drive electrodes; a first power line connected to a cathode electrode of a light-emitting element; an initialization line providing an initialization voltage to an anode electrode of the light-emitting element; and a compensation circuit connected between the plurality of drive lines and the initialization line.

[0018] The compensation circuit may include a resistor and a compensation capacitor connected in series.

[0019] The capacitance of the compensation capacitor may be the same as the capacitance of the capacitor formed between the plurality of driving lines and the first power line.

[0020] The compensation circuit may change the initialization voltage based on a touch driving voltage supplied to the plurality of driving lines during a touch driving period.

[0021] The initialization voltage may be changed by a voltage corresponding to an amount of charge corresponding to a product of the capacitance of the compensation capacitor and the touch driving voltage.

[0022] The change amount of the initialization voltage may be the same as the change amount of the first power voltage supplied to the first power line. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other features of the embodiments of the present disclosure will become more apparent by describing the embodiments of the present disclosure in further detail with reference to the accompanying drawings.

[0024] Figure 1 is a diagram showing a display device according to an embodiment.

[0025] Figure 2 is a diagram showing an example of a stacked structure of a display device.

[0026] Figure 3 is a diagram showing a display device according to an embodiment.

[0027] Figure 4 is a diagram illustrating a display driving period and a touch driving period according to an embodiment.

[0028] Figure 5 and Figure 6 is a diagram showing a touch driving period according to an embodiment.

[0029] Figure 7 is a diagram showing a pixel according to an embodiment.

[0030] Figure 8 It is shown Figure 7 The operation of the pixel is shown in the diagram.

[0031] Fig. 9 is a diagram showing an example of display driving.

[0032] Fig.10 is a diagram showing an example of display driving affected by touch driving.

[0033] Fig.11 is a diagram showing a compensation circuit according to an embodiment.

[0034] Fig.12 is a diagram showing an example of display driving affected by touch driving when a compensation circuit is applied. DETAILED DESCRIPTION

[0035] The concepts of the present disclosure will now be more fully described below with reference to the accompanying drawings in which various embodiments are shown. However, the concepts of the present disclosure may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Instead, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art.

[0036] When describing the accompanying drawings, the same reference numerals have been used for the same elements. In the accompanying drawings, the size of the structure is enlarged compared to the actual size, so as to clearly explain the present disclosure. It will 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. For example, the first element discussed below can be referred to as the second element without departing from the scope of the present disclosure. Similarly, the second element can also be referred to as the first element.

[0037] The terms used in this article are only used for the purpose of describing specific embodiments, and are not intended to be restrictive. As used in this article, "one", "the (described)" and "at least one" do not represent the limitation of quantity, and are intended to include both the singular and the plural, unless the context clearly indicates otherwise. For example, "element" has the same meaning as "at least one element", unless the context clearly indicates otherwise. "At least one" should not be interpreted as being limited to "one". "Or" refers to "and / or". As used in this article, the term "and / or" includes any and all combinations of one or more of the related listed items. It will be further understood that when used in this specification, the term "includes" and / or "comprising" or "containing" and / or "having" indicates the presence of the described features, regions, wholes, steps, operations, elements and / or parts, but does not exclude the presence or increase of one or more other features, regions, wholes, steps, operations, elements, parts and / or their groups.

[0038] In the following description, when the first part is "connected" to the second part, this includes not only the case where the first part is directly connected to the second part, but also the case where a third part is interposed between the first part and the second part and the first part and the second part are connected to each other through the third part.

[0039] In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship of one element to another element shown in the drawings. It will be understood that, in addition to the orientation depicted in the drawings, relative terms are intended to include different orientations of the device. For example, if the device in one of the drawings is turned over, the element described as being on the "lower" side of the other element will then be oriented on the "upper" side of the other element. Therefore, depending on the specific orientation of the drawings, the term "lower" can include both "lower" and "upper" orientations. Similarly, if the device in one of the drawings is turned over, the element described as being "below" or "below" the other element will then be oriented "above" the other element. Therefore, the term "below" or "below" can include both "above" and "below" orientations.

[0040] Unless otherwise defined, all terms (including technical and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0041] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0042] Figure 1 is a diagram showing a display device according to an embodiment.

[0043] refer to Figure 1 , the display device 1 may include a panel 10 , a driving circuit unit 20 , and a power supply (PM-IC) 30 .

[0044] The display device 1 may be a device that is activated according to an electrical signal to display an image and sense a touch input. That is, the display device 1 may operate in a display drive mode for displaying an image and a touch drive mode for sensing a touch input. The display device 1 may be used as a display screen for portable electronic devices such as mobile phones, smart phones, tablet personal computers (PCs), mobile communication terminals, electronic notebooks, electronic books, portable multimedia players (PMPs), navigation devices, and ultra-mobile PCs (UMPCs). In addition, the display device 1 may be used as a display screen for various products such as televisions, laptop computers, monitors, billboards, and Internet of Things (IOT) devices.

[0045] The panel 10 may include a display unit 110 for displaying an image. In addition, the panel 10 may include a sensor unit 120 for sensing touch, pressure, fingerprint, or hovering, etc. For example, the panel 10 may include a plurality of pixels PX and a plurality of sensors SC positioned to overlap at least some of the plurality of pixels PX.

[0046] The driving circuit unit 20 may include a display driver (D-IC) 210 for driving the display unit 110 and a sensor driver (T-IC) 220 for driving the sensor unit 120. When the display device 1 operates in a display driving mode, the plurality of pixels PX may display an image in units of display frames. When the display device 1 operates in a touch driving mode, the plurality of sensors SC may sense a touch input of a user or the like in units of sensing frames. The display frame and the sensing frame may be the same or different from each other.

[0047] The display unit 110 and the sensor unit 120 may be manufactured separately from each other and then arranged so that at least one region of the display unit 110 and the sensor unit 120 overlaps each other. However, the present disclosure is not limited thereto, and the display unit 110 and the sensor unit 120 may be integrally manufactured.

[0048] The sensor unit 120 may be provided on the display unit 110. For example, the sensor unit 120 may be provided on the front surface of the display unit 110 (i.e., provided on the upper surface where the image is displayed). However, the present disclosure is not limited thereto, and the sensor unit 120 may be provided on the back surface or the front and back surfaces of the display unit 110, or may be provided on an edge region of at least one side of the display unit 110.

[0049] The display unit 110 may include a display substrate 111 and a plurality of pixels PX formed on the display substrate 111. The plurality of pixels PX may be disposed in a display area DA of the display substrate 111.

[0050] The display substrate 111 may include a display area DA displaying an image and a non-display area NDA outside the display area DA. For example, the display area DA may be disposed in a central area of ​​the display unit 110, and the non-display area NDA may be disposed in an edge area of ​​the display unit 110 surrounding the display area DA.

[0051] The display substrate 111 may be a rigid substrate or a flexible substrate. For example, the display substrate 111 may be a rigid substrate made of glass (eg, tempered glass) or a flexible substrate made of a thin film made of plastic or metal.

[0052] A plurality of scan lines SL, a plurality of data lines DL, and a plurality of pixels PX connected to the corresponding scan lines SL and data lines DL may be provided in the display area DA. Each of the plurality of pixels PX may be activated by a scan signal having an on level supplied from the corresponding scan line SL, and may emit light having a brightness corresponding to a data signal supplied from the corresponding data line DL. Accordingly, an image corresponding to the data signal may be displayed in the display area DA.

[0053] Various lines and / or built-in circuit units connected to the plurality of pixels PX in the display area DA may be disposed in the non-display area NDA. For example, a plurality of lines for supplying various power sources and control signals to the display area DA may be disposed in the non-display area NDA.

[0054] The type of the display unit 110 is not particularly limited. For example, the display unit 110 may be implemented as a self-luminous display panel such as an organic light-emitting display panel. However, when the display unit 110 is implemented as a self-luminous display panel, each of the multiple pixels PX is not limited to a structure including only organic light-emitting elements. For example, the light-emitting element of each of the multiple pixels PX may be composed of an organic light-emitting diode, an inorganic light-emitting diode, or a quantum dot / well light-emitting diode, etc. In addition, a plurality of light-emitting elements may be provided in each of the multiple pixels PX. In this case, the plurality of light-emitting elements may be connected in series, in parallel, or in series and in parallel. In addition, the display unit 110 may be implemented as a non-luminous display panel such as a liquid crystal display panel. When the display unit 110 is implemented as a non-luminous display panel, the display device 1 may further include a light source such as a backlight unit.

[0055] The sensor unit 120 may include a sensor substrate 121 and a plurality of sensors SC formed on the sensor substrate 121. The plurality of sensors SC may be disposed on the sensor substrate 121 in the sensing area SA.

[0056] The sensor substrate 121 may include a sensing area SA capable of sensing a touch input or the like and a non-sensing area NSA outside the sensing area SA. The sensing area SA may be set to overlap with at least one area of ​​the display area DA. For example, the sensing area SA may be set to an area overlapping with the display area DA, and the non-sensing area NSA may be set to an area overlapping with the non-display area NDA. In this case, when a touch input or the like is provided on the display area DA, the touch input may be detected by the sensor unit 120.

[0057] The sensor substrate 121 may be a rigid substrate or a flexible substrate. For example, the sensor substrate 121 may be a rigid substrate made of glass (e.g., tempered glass) or a flexible substrate made of a thin film made of plastic or metal. In addition, the sensor substrate 121 may be composed of at least one insulating layer. For example, at least one substrate constituting the display unit 110 (e.g., the display substrate 111 or a packaging substrate, etc.) or at least one insulating layer or functional layer disposed inside and / or outside the display unit 110 may be used as the sensor substrate 121. In addition, the sensor substrate 121 may be a transparent substrate or a translucent substrate.

[0058] The sensing area SA may be an area (i.e., an active area) that can respond to a touch input. To this end, a plurality of sensors SC for sensing a touch input, etc. may be provided in the sensing area SA. According to an embodiment, the plurality of sensors SC may include a plurality of first sensors TX and a plurality of second sensors RX. The first sensors TX may be referred to as drive electrodes, and the second sensors RX may be referred to as sensing electrodes.

[0059] The plurality of first sensors TX may be connected to each other through the plurality of first bridges. The plurality of first bridges may be integrally formed with the plurality of first sensors TX in the same layer, or may be formed in a different layer from the plurality of first sensors TX to electrically connect adjacent first sensors TX to each other. Figure 1 , the plurality of first sensors TX are shown in a diamond shape, but the plurality of first sensors TX may be configured in various shapes such as a circular shape, a square shape, a triangular shape, or a grid shape.

[0060] The plurality of second sensors RX may be connected to each other through the plurality of second bridges. The plurality of second bridges may be integrally formed with the plurality of second sensors RX in the same layer, or may be formed in a different layer from the plurality of second sensors RX to electrically connect adjacent second sensors RX. Figure 1 , the plurality of second sensors RX are illustrated as a diamond shape, but the plurality of second sensors RX may be configured in various shapes such as a circular shape, a square shape, a triangular shape, or a grid shape.

[0061] at the same time, Figure 1 An example is shown in which the plurality of first sensors TX and the plurality of second sensors RX are arranged to intersect each other. However, the arrangement of the plurality of first sensors TX and the plurality of second sensors RX is not particularly limited.

[0062] The plurality of first sensors TX and the plurality of second sensors RX may have electrical conductivity by including a metal material or a transparent conductive material, etc. For example, the plurality of first sensors TX and the plurality of second sensors RX may include at least one of various metal materials including gold (Au), silver (Ag), aluminum (Al), molybdenum (Mo), chromium (Cr), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), platinum (Pt), and alloys thereof. In addition, the plurality of first sensors TX and the plurality of second sensors RX may include a plurality of metal materials including silver nanowires (AgNW), indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), antimony zinc oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), tin oxide (SnO 2 ), carbon nanotubes, and graphene. In addition, the plurality of first sensors TX and the plurality of second sensors RX may have conductivity by including at least one of the various conductive materials.

[0063] The driving circuit unit 20 may include a display driver 210 for driving the display unit 110 and a sensor driver 220 for driving the sensor unit 120. The display driver 210 and the sensor driver 220 may be configured as separate integrated circuits. However, the present disclosure is not limited thereto, and at least a portion of the display driver 210 and the sensor driver 220 may be implemented in one integrated circuit.

[0064] The display driver 210 may be electrically connected to the display unit 110 to drive the plurality of pixels PX. For example, the display driver 210 may include a scan driver that supplies scan signals to the plurality of scan lines SL, a data driver that supplies data signals to the plurality of data lines DL, and a timing controller that controls the scan driver and the data driver. In addition, the display driver 210 may further include a plurality of emission control lines EML (see FIG. 1 ) that supplies emission control signals to the plurality of pixels PX. Figure 7 ) of the transmitter controller.

[0065] The sensor driver 220 may be electrically connected to the sensor unit 120 to drive the sensor unit 120. For example, the sensor driver 220 may supply a touch driving signal for driving the sensor unit 120 to the sensor unit 120, and may receive a touch sensing signal according to a touch input of a user or the like from the sensor unit 120.

[0066] The power supply 30 may be electrically connected to the display unit 110 to drive the display unit 110. For example, the power supply 30 may supply a display driving signal for driving the display unit 110 to the display unit 110. In addition, the power supply 30 may supply an initialization signal for initializing an anode electrode of a light emitting element included in each of a plurality of pixels PX to the display unit 110. The power supply 30 may be configured in the form of an integrated circuit.

[0067] Figure 2 is a diagram showing an example of a stacked structure of a display device.

[0068] refer to Figure 2 , the sensor unit 120 may be stacked on the display unit 110, and the window WIN may be stacked on the sensor unit 120. That is, the display unit 110 and the sensor unit 120 may be stacked adjacent to each other.

[0069] The display unit 110 may include a display substrate 111, a circuit element layer BPL formed on the display substrate 111, and a plurality of light emitting elements LD formed on the circuit element layer BPL. The circuit element layer BPL may include circuit elements (e.g., transistors and capacitors) for driving the plurality of light emitting elements LD. In addition, the circuit element layer BPL may further include a plurality of scan lines SL (see Figure 1) and multiple data lines DL (see Figure 1 )wait.

[0070] The sensor unit 120 may include a sensor substrate 121, a plurality of sensors SC formed on the sensor substrate 121, and a protective layer 122 covering the plurality of sensors SC. The sensor substrate 121 may be configured in the form of an encapsulation layer covering a plurality of light emitting elements LD. However, the present disclosure is not limited thereto, and the sensor substrate 121 may be provided separately from the encapsulation layer covering the plurality of light emitting elements LD.

[0071] The window WIN may be provided in a manner that constitutes the display device 1 (see Figure 1 ) is a protective member on the top of the module and may be a substantially transparent 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.

[0072] Despite Figure 2 Although not shown in the figure, the display device 1 may further include a polarizing plate (or other type of anti-reflection layer) disposed between the window WIN and the sensor unit 120 to prevent reflection of external light.

[0073] Figure 3 2 is a diagram showing a display device according to an embodiment. Figure 3 ,and Figure 1 Repetitive content will be briefly described or omitted. Figure 4 is a diagram illustrating a display driving period and a touch driving period according to an embodiment. Figure 5 and Figure 6 is a diagram showing a touch driving period according to an embodiment.

[0074] refer to Figure 3 , the display driver 210 may be configured to drive the display driver 210 during the display driving period DP (see Figure 4 ) during which a signal for display driving of the display device 1 is supplied to the display unit 110. The display driver 210 may supply a data signal DATA to a plurality of data lines DL. The display driver 210 may supply a plurality of scan signals GW, GB, and GI to a plurality of scan lines SL. For example, the display driver 210 may supply a first scan signal GW to a first scan line GWL (see Figure 7 ), supplying the second scan signal GI to the second scan line GIL (see Figure 7 ) and supplies the third scan signal GB to the third scan line GBL (see Figure 7 The display driver 210 may supply the emission control signal EM to a plurality of emission control lines EML (see Figure 7 ).

[0075] The sensor unit 120 may include a plurality of driving electrodes TX1, TX2, TX3, and TX4 arranged in the sensing area SA. Figure 3 In the embodiment of the present invention, the plurality of first driving electrodes TX1 may be arranged in the second column, the plurality of second driving electrodes TX2 may be arranged in the fourth column, the plurality of third driving electrodes TX3 may be arranged in the sixth column, and the plurality of fourth driving electrodes TX4 may be arranged in the eighth column. The plurality of driving electrodes TX1, TX2, TX3, and TX4 may be arranged in the first row, the third row, the fifth row, the seventh row, and the ninth row. However, the driving electrodes TX (see Figure 1 ) are not limited to this in number and arrangement.

[0076] A plurality of driving electrodes TX1, TX2, TX3, and TX4 may be connected to a plurality of driving lines TXL1, TXL2, TXL3, and TXL4. For example, a plurality of first driving electrodes TX1 may be connected to a first driving line TXL1, a plurality of second driving electrodes TX2 may be connected to a second driving line TXL2, a plurality of third driving electrodes TX3 may be connected to a third driving line TXL3, and a plurality of fourth driving electrodes TX4 may be connected to a fourth driving line TXL4. Accordingly, a plurality of driving electrodes TX1, TX2, TX3, and TX4 may be connected to the sensor driver 220 through a plurality of driving lines TXL1, TXL2, TXL3, and TXL4.

[0077] The sensor unit 120 may include a plurality of sensing electrodes RX1, RX2, RX3, and RX4 arranged in a sensing area SA. Figure 3 In an embodiment, a plurality of first sensing electrodes RX1 may be arranged in the second row, a plurality of second sensing electrodes RX2 may be arranged in the fourth row, a plurality of third sensing electrodes RX3 may be arranged in the sixth row, and a plurality of fourth sensing electrodes RX4 may be arranged in the eighth row. A plurality of sensing electrodes RX1, RX2, RX3, and RX4 may be arranged in the first column, the third column, the fifth column, the seventh column, and the ninth column. That is, a plurality of sensing electrodes RX1, RX2, RX3, and RX4 may be arranged to intersect with a plurality of driving electrodes TX1, TX2, TX3, and TX4. However, the sensing electrodes RX (see Figure 1 ) are not limited to this in number and arrangement.

[0078] A plurality of sensing electrodes RX1, RX2, RX3, and RX4 may be connected to a plurality of sensing lines RXL1, RXL2, RXL3, and RXL4. For example, a plurality of first sensing electrodes RX1 may be connected to a first sensing line RXL1, a plurality of second sensing electrodes RX2 may be connected to a second sensing line RXL2, a plurality of third sensing electrodes RX3 may be connected to a third sensing line RXL3, and a plurality of fourth sensing electrodes RX4 may be connected to a fourth sensing line RXL4. Accordingly, a plurality of sensing electrodes RX1, RX2, RX3, and RX4 may be connected to the sensor driver 220 through a plurality of sensing lines RXL1, RXL2, RXL3, and RXL4.

[0079] The sensor driver 220 may be configured to drive the touch signal during the touch driving period SP (see Figure 4 ) during which the touch drive signal TDS is supplied to the plurality of drive lines TXL1, TXL2, TXL3, and TXL4. The touch drive signal TDS may be supplied to the plurality of drive electrodes TX1, TX2, TX3, and TX4 through the plurality of drive lines TXL1, TXL2, TXL3, and TXL4.

[0080] refer to Figure 5 In an embodiment, the sensor driver 220 may supply a touch drive signal TDS to a plurality of drive electrodes TX1, TX2, TX3, and TX4 simultaneously during a first touch drive period SP1. In this case, a plurality of sensing electrodes RX1, RX2, RX3, and RX4 may receive a separate reference signal (e.g., a ground voltage) or may be in a floating state. A plurality of drive electrodes TX1, TX2, TX3, and TX4 may have self-capacitance. In this case, when a touch input of a user or the like approaches a plurality of drive electrodes TX1, TX2, TX3, and TX4, the self-capacitance of the plurality of drive electrodes TX1, TX2, TX3, and TX4 may be changed depending on the capacitance formed by the user or the like. The drive signal reflecting the self-capacitance may be referred to as a touch sensing signal. The position of the touch input of the user or the like may be detected using the difference of the touch sensing signals of the plurality of drive electrodes TX1, TX2, TX3, and TX4. Therefore, the first touch drive period SP1 may be a period in which the sensor unit 120 and the sensor driver 220 are driven in a self-capacitance mode.

[0081] refer to Figure 6In an embodiment, the sensor driver 220 may sequentially supply the touch drive signal TDS to the plurality of drive electrodes TX1, TX2, TX3, and TX4 during the second touch drive period SP2. The plurality of sensing electrodes RX1, RX2, RX3, and RX4 may receive a touch sensing signal corresponding to the touch drive signal TDS. In the sensing area SA, the mutual capacitance between the plurality of drive electrodes TX1, TX2, TX3, and TX4 and the plurality of sensing electrodes RX1, RX2, RX3, and RX4 may vary depending on the position of the touch input of the user or the like. Accordingly, the touch sensing signals received by the plurality of sensing electrodes RX1, RX2, RX3, and RX4 may be different from each other. Using this difference in the touch sensing signal, the position of the touch input of the user or the like may be detected. Therefore, the second touch drive period SP2 may be a period in which the sensor unit 120 and the sensor driver 220 are driven in a mutual capacitance mode.

[0082] The power supply 30 can be used in the display driving period DP (see Figure 4 ) during which a power signal for display driving of the display device 1 is supplied to the display unit 110. For example, the power supply 30 may supply the first power voltage ELVSS to the first power line ELVSSL. In addition, the power supply 30 may supply the initialization voltage AINT to the initialization line IL. In addition, the power supply 30 may supply the second power voltage ELVDD (see Figure 7 ) is supplied to the second power line ELVDDL (see Figure 7 ).

[0083] refer to Figure 4 , a display drive period DP in which the display device 1 operates in a display drive mode for displaying an image and a touch drive period SP in which the display device 1 operates in a touch drive mode for sensing a touch input of a user or the like may overlap with each other. For example, the touch drive period SP may overlap with at least a portion of the display drive period DP. When the display drive period DP and the touch drive period SP overlap with each other, image quality may be degraded due to the influence of the touch drive on the display drive. In particular, since the display unit 110 and the sensor unit 120 are disposed close to each other (see Figure 2 ), so the degradation of image quality due to touch driving may worsen.

[0084] In an embodiment, the display device 1 may further include a compensation circuit 40. The compensation circuit 40 may be provided between the plurality of driving lines TXL1, TXL2, TXL3, and TXL4 and the initialization line IL. The compensation circuit 40 may prevent degradation of image quality due to overlap between the touch driving period SP and the display driving period DP. For example, the compensation circuit 40 may change the initialization voltage AINT in response to a change in the first power supply voltage ELVSS caused by the influence of the touch driving signal TDS. The specific structure and function of the compensation circuit 40 will be referred to later. Fig.11 and Fig.12 is described.

[0085] Figure 7 is a diagram showing a pixel according to an embodiment.

[0086] refer to Figure 7 The pixel PX may include a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, a storage capacitor C ST and a light emitting element LD.

[0087] The first transistor T1 may include a gate electrode connected to the first node N1, a first electrode connected to the second node N2, and a second electrode connected to the third node N3. The first transistor T1 may be connected between the second node N2 and the third node N3, and the gate electrode of the first transistor T1 may be connected to the first node N1 to control the driving current. The first transistor T1 may generate the driving current in response to the data signal DATA.

[0088] The second transistor T2 may include a gate electrode receiving the first scan signal GW, a first electrode receiving the data signal DATA, and a second electrode connected to the second node N2. The second transistor T2 may be connected between the data line DL and the second node N2, and the gate electrode of the second transistor T2 may be connected to the first scan line GWL. The second transistor T2 may supply the data signal DATA to the second node N2 in response to the first scan signal GW.

[0089] The third transistor T3 may include a gate electrode receiving the first scan signal GW, a first electrode connected to the first node N1, and a second electrode connected to the third node N3. The third transistor T3 may be connected between the first node N1 and the third node N3, and the gate electrode of the third transistor T3 may be connected to the first scan line GWL. When the third transistor T3 is turned on, the first transistor T1 may be connected in the form of a diode.

[0090] The fourth transistor T4 may include a gate electrode receiving the second scan signal GI, a first electrode connected to the first node N1, and a second electrode receiving the initialization voltage AINT. The fourth transistor T4 may be connected between the first node N1 and the initialization line IL (or the fourth node N4), and the gate electrode of the fourth transistor T4 may be connected to the second scan line GIL. The fourth transistor T4 may supply the initialization voltage AINT to the first node N1 in response to the second scan signal GI.

[0091] The fifth transistor T5 may include a gate electrode receiving the emission control signal EM, a first electrode receiving the second power supply voltage ELVDD, and a second electrode connected to the second node N2. The fifth transistor T5 may be connected between the second power supply line ELVDDL and the second node N2, and the gate electrode of the fifth transistor T5 may be connected to the emission control line EML. The fifth transistor T5 may supply the second power supply voltage ELVDD to the second node N2 in response to the emission control signal EM.

[0092] The sixth transistor T6 may include a gate electrode receiving an emission control signal EM, a first electrode connected to the third node N3, and a second electrode connected to the fifth node N5. The sixth transistor T6 may be connected between the third node N3 and the fifth node N5, and the gate electrode of the sixth transistor T6 may be connected to the emission control line EML. The sixth transistor T6 may provide a voltage of the third node N3 to the fifth node N5 in response to the emission control signal EM.

[0093] The seventh transistor T7 may include a gate electrode receiving the third scan signal GB, a first electrode receiving the initialization voltage AINT, and a second electrode connected to the fifth node N5. The seventh transistor T7 may be connected between the initialization line IL and the fifth node N5, and the gate electrode of the seventh transistor T7 may be connected to the third scan line GBL. The seventh transistor T7 may provide the initialization voltage AINT to the anode electrode (or the fifth node N5) of the light emitting element LD in response to the third scan signal GB.

[0094] The light emitting element LD may include an anode electrode connected to the fifth node N5 and a cathode electrode receiving the first power voltage ELVSS. The light emitting element LD may be connected between the fifth node N5 and the first power line ELVSSL. The light emitting element LD may emit light based on the driving current transmitted through the first transistor T1.

[0095] Figure 8 It is shown Figure 7 The operation of the pixel is shown in the diagram.

[0096] refer to Figure 8 , pixel PX (see Figure 7) can operate in a first section P1 in which the gate electrode of the first transistor T1 is initialized, a second section P2 in which the data signal DATA compensated by the threshold voltage is written and the anode electrode of the light emitting element LD is initialized, and a third section P3 in which the light emitting element LD emits light.

[0097] During the first section P1 , the fourth transistor T4 may be turned on, and the initialization voltage AINT may be applied to the first node N1 to initialize the gate electrode of the first transistor T1 .

[0098] During the second section P2, the second transistor T2 and the third transistor T3 may be turned on to supply the data signal DATA to the first node N1, and since the third transistor T3 is turned on, the first transistor T1 may be connected in the form of a diode. Accordingly, the data signal DATA compensated by the threshold voltage of the first transistor T1 may be stored in the storage capacitor C ST In addition, during the second section P2, the seventh transistor T7 may be turned on, and the initialization voltage AINT may be applied to the anode electrode of the light emitting element LD to initialize the anode electrode.

[0099] During the third section P3, the fifth transistor T5 and the sixth transistor T6 may be turned on so that the driving current generated in the first transistor T1 may flow to the light emitting element LD. Accordingly, the light emitting element LD may emit light having brightness corresponding to the driving current.

[0100] Fig. 9 is a diagram showing an example of display driving. Fig.10 is a diagram showing an example of display driving affected by touch driving.

[0101] refer to Fig. 9 During the second section P2, when the third scan signal GB is applied to the seventh transistor T7 (see Figure 7 ) when the light emitting element LD (see Figure 7 ) can be initialized to the initialization voltage AINT. For example, the anode voltage ANODE of the light emitting element LD can be reduced from the threshold voltage VTH of the light emitting element LD to the initialization voltage AINT.

[0102] During the third section P3, since the driving current flows to the light emitting element LD, the anode voltage ANODE of the light emitting element LD may increase. For example, the anode voltage ANODE of the light emitting element LD may increase by a voltage VDATA corresponding to the data signal DATA.

[0103] When the touch driving does not affect the display driving, the first power supply voltage ELVSS may be kept constant. Accordingly, the light emitting element LD may emit light having a brightness corresponding to the difference VD between the anode voltage ANODE and the first power supply voltage ELVSS.

[0104] refer to Fig.10 , when the touch drive affects the display drive, the first power supply voltage ELVSS may be changed. For example, the touch drive signal TDS provided during the touch drive may affect the first power supply voltage ELVSS, so that the first power supply voltage ELVSS may increase by a change amount VCA1. Accordingly, since the light emitting element LD emits light having an undesired brightness corresponding to the difference VD' between the anode voltage ANODE and the changed first power supply voltage ELVSS', the image quality may be degraded. For example, a horizontal line may be visible in the image.

[0105] Fig.11 is a diagram showing a compensation circuit according to an embodiment. Fig.12 is a diagram showing an example of display driving affected by touch driving when a compensation circuit is applied.

[0106] refer to Fig.11 The compensation circuit 40 may include a resistor R and a compensation capacitor C connected in series between the plurality of driving lines TXL1, TXL2, TXL3, and TXL4 and the initialization line IL. AINT The resistor R may refer to the resistance of a line constituting the compensation circuit 40 .

[0107] Compensation capacitor C AINT It may be a component for changing the initialization voltage AINT by the amount of change of the first power supply voltage ELVSS. That is, by compensating the capacitor C AINT The change amount of the initialization voltage AINT performed may be equal to the change amount of the first power supply voltage ELVSS caused by the influence of the touch drive signal TDS. In this case, the change amount of the first power supply voltage ELVSS may be based on the capacitor C formed between the plurality of drive lines TXL1, TXL2, TXL3, and TXL4 and the first power supply line ELVSSL. TE For example, the first power supply voltage ELVSS can be increased by the capacitor C TE The voltage corresponding to the amount of charge (in coulombs) corresponding to the product of the capacitance of the touch drive signal TDS and the touch drive voltage TDV of the touch drive signal TDS. That is, due to the capacitor C formed between the plurality of drive lines TXL1, TXL2, TXL3 and TXL4 and the first power line ELVSSL TE Due to the coupling effect, the first power voltage ELVSS can be changed into an increased first power voltage ELVSS'.

[0108] Compensation capacitor C AINT The capacitance may be equal to the capacitor C formed between the plurality of driving lines TXL1, TXL2, TXL3, and TXL4 and the first power line ELVSSL. TE Since a parasitic capacitor (not shown) is formed in parallel between each of the plurality of driving lines TXL1, TXL2, TXL3, and TXL4 and the first power line ELVSSL, the capacitor C TE The capacitance of can be derived as the product of the number of the plurality of driving lines TXL1, TXL2, TXL3 and TXL4 and the capacitance of the parasitic capacitor (not shown). The capacitance of the parasitic capacitor (not shown) may vary depending on the design of the plurality of driving lines TXL1, TXL2, TXL3 and TXL4 and the first power line ELVSSL.

[0109] The initialization voltage AINT can be increased with the compensation capacitor C AINT The voltage corresponding to the charge amount corresponding to the product of the capacitance of the touch drive signal TDS and the touch drive voltage TDV of the touch drive signal TDS. That is, due to the compensation capacitor C formed between the plurality of drive lines TXL1, TXL2, TXL3 and TXL4 and the initialization line IL AINT Due to the coupling effect of the touch drive signal TDS, the initialization voltage AINT may be changed to the increased initialization voltage AINT'. In particular, the initialization voltage AINT may be changed by the amount of change of the first power supply voltage ELVSS caused by the influence of the touch drive signal TDS.

[0110] refer to Fig.11 and Fig.12 Since the compensation circuit 40 is disposed between the plurality of driving lines TXL1, TXL2, TXL3 and TXL4 and the initialization line IL, during the second section P2, the light emitting element LD (see Figure 7 ) can be initialized to the changed initialization voltage AINT'. In this case, the anode voltage ANODE of the light emitting element LD can be initialized to the initialization voltage AINT' increased by the change amount VCA2 equal to the change amount VCA1 of the first power supply voltage ELVSS caused by the influence of the touch drive signal TDS.

[0111] During the third section P3, since the anode voltage ANODE of the light emitting element LD increases by the voltage VDATA corresponding to the data signal DATA from the initialization voltage AINT' increased in the second section P2, the anode voltage ANODE of the light emitting element LD can be maintained at a higher voltage. During the third section P3, the anode voltage ANODE of the light emitting element LD can be maintained as a voltage increased by the change amount VCA2 of the initialization voltage AINT. In this case, since the change amount VCA2 of the initialization voltage AINT is the same as the change amount VCA1 of the first power supply voltage ELVSS, the light emitting element LD can emit light having a brightness corresponding to the difference VD between the changed anode voltage AINT'+VDATA and the changed first power supply voltage ELVSS'. That is, since the voltage (i.e., the difference VD) applied to the light emitting element LD remains constant regardless of the change in the first power supply voltage ELVSS caused by the touch drive, degradation of image quality can be prevented.

[0112] As described above, the compensation circuit 40 can change the initialization voltage AINT by the change amount of the first power voltage ELVSS caused by the touch driving signal TDS, thereby preventing the touch driving period SP (see FIG. 1 ) from causing the touch driving signal TDS to cause the touch driving period SP to cause the touch driving signal TDS ... Figure 4 ) and the display driving period DP (see Figure 4 ) due to the overlap between them, which causes the degradation of image quality.

[0113] According to the embodiments of the present disclosure, a display device that can prevent degradation of image quality due to the influence of touch driving on display driving can be provided.

[0114] However, the effects of the present disclosure are not limited to the above-mentioned effects and may be variously extended without departing from the spirit and scope of the present disclosure.

[0115] Although the present disclosure has been specifically described according to the above embodiments, it should be noted that the above embodiments are intended to illustrate the present disclosure and are not intended to limit the scope of the present disclosure. A person skilled in the art will understand that various modifications are possible within the scope of the technical spirit of the present disclosure.

[0116] Therefore, the technical protection scope of the present disclosure is not limited to the detailed description described in the specification, but should be determined by the claims. In addition, all changes or modifications derived from the claims and their equivalent meanings and scopes should be interpreted as included within the scope of the present disclosure. The embodiments can be combined to form additional embodiments.

Claims

1. A display device, comprising: A display unit including a plurality of pixels connected to an initialization line and a first power supply line; a sensor unit provided on the display unit and including a plurality of driving electrodes; a sensor driver that provides a touch driving voltage to a plurality of driving lines connected to the plurality of driving electrodes; a power supply, supplying an initialization voltage to the initialization line and supplying a first power supply voltage to the first power supply line; as well as The compensation circuit compensates the initialization voltage.

2. The display device according to claim 1, wherein: The compensation circuit changes the initialization voltage in response to a change in the first power supply voltage.

3. The display device according to claim 2, wherein: The compensation circuit is connected between the plurality of driving lines and the initialization line.

4. The display device according to claim 3, wherein: The compensation circuit includes a resistor and a compensation capacitor connected in series.

5. The display device according to claim 4, wherein: The capacitance of the compensation capacitor is the same as the capacitance of a capacitor formed between the plurality of driving lines and the first power line.

6. The display device according to claim 5, wherein: The initialization voltage is changed by a voltage corresponding to an amount of charge corresponding to a product of the capacitance of the compensation capacitor and the touch driving voltage.

7. The display device according to claim 6, wherein: The change amount of the initialization voltage is the same as the change amount of the first power supply voltage.

8. The display device according to any one of claims 1 to 7, wherein: Each of the plurality of pixels comprises: a first transistor including a gate electrode connected to a first node, a first electrode connected to a second node, and a second electrode connected to a third node; a second transistor including a gate electrode connected to the first scan line, a first electrode connected to the data line, and a second electrode connected to the second node; a third transistor including a gate electrode connected to the first scan line, a first electrode connected to the first node, and a second electrode connected to the third node; a fourth transistor including a gate electrode connected to the second scan line, a first electrode connected to the first node, and a second electrode connected to the initialization line or a fourth node; a fifth transistor including a gate electrode connected to the emission control line, a first electrode connected to the second power line, and a second electrode connected to the second node; a sixth transistor including a gate electrode connected to the emission control line, a first electrode connected to the third node, and a second electrode connected to a fifth node; a seventh transistor including a gate electrode connected to a third scan line, a first electrode connected to the initialization line, and a second electrode connected to the fifth node; and The light emitting element includes an anode electrode connected to the fifth node and a cathode electrode connected to the first power line.

9. The display device according to claim 8, wherein: The anode electrode is initialized to a compensated initialization voltage in response to the seventh transistor being turned on.

10. The display device according to any one of claims 1 to 7, wherein: The sensor unit further includes a plurality of sensing electrodes, and The sensor driver receives touch sensing signals from a plurality of sensing lines connected to the plurality of sensing electrodes.

11. A display device, the display device operating in a display driving period and a touch driving period overlapping at least a portion of the display driving period, the display device comprising: A plurality of driving lines connected to the plurality of driving electrodes; A first power line connected to the cathode electrode of the light emitting element; an initialization line for providing an initialization voltage to an anode electrode of the light emitting element; as well as The compensation circuit is connected between the plurality of driving lines and the initialization line.

12. The display device according to claim 11, wherein: The compensation circuit includes a resistor and a compensation capacitor connected in series.

13. The display device according to claim 12, wherein: The capacitance of the compensation capacitor is the same as the capacitance of a capacitor formed between the plurality of driving lines and the first power line.

14. The display device according to claim 13, wherein: The compensation circuit changes the initialization voltage based on a touch driving voltage provided to the plurality of driving lines during the touch driving period.

15. The display device according to claim 14, wherein: The initialization voltage is changed by a voltage corresponding to an amount of charge corresponding to a product of the capacitance of the compensation capacitor and the touch driving voltage.

16. The display device according to claim 15, wherein: The change amount of the initialization voltage is the same as the change amount of the first power voltage supplied to the first power line.

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