Display device, method of driving display device, and display system

Abstract

The invention provides a display device, a method of driving the display device, and a display system. The display device includes a display panel, a panel driver, a touch driving signal output layer touching the panel, and a touch driver. The panel driver outputs a panel driving signal to the display panel. The touch driver outputs a touch driving signal to the touch driving signal output layer. The display device determines a driving frequency of the display panel according to the panel driving signal, and synchronizes a frequency of the touch driving signal with the driving frequency.

Description

Technical Field

[0001] Embodiments of the inventive concept are directed to a display device, a method of driving the display device, and a display system including the display device. More particularly, embodiments of the inventive concept are directed to a display device for reducing horizontal line defects and stain defects of a display panel. Background Art

[0002] Flat panel displays are thin, lightweight display devices used in many modern electronic devices such as televisions, computer monitors, smart phones, and tablet personal computers (PCs). Unlike older display technologies such as cathode ray tubes (CRTs), flat panel displays are thinner and consume less power. Examples of flat panel displays include liquid crystal displays (LCDs), light emitting diode displays (LEDs), and organic light emitting diode displays (OLEDs).

[0003] The flat panel display includes a display panel and a panel driver. The display panel displays an image based on input image data. The display panel includes a plurality of gate lines, a plurality of data lines and a plurality of pixels. The panel driver includes a gate driver, a data driver and a drive controller. The gate driver outputs a gate signal to the gate line. The data driver outputs a data voltage to the data line. The drive controller controls the operation of the gate driver and the operation of the data driver. The panel driver can control the display panel using a panel drive signal.

[0004] The flat panel display may further include a touch panel, which is an input device that allows a user to interact with the displayed content directly rather than using a pointing device such as a mouse or trackpad. Examples of touch panels include resistive touch panels and capacitive touch panels. The touch panel can be controlled using a touch drive signal.

[0005] The frequencies of the panel driving signal and the touch driving signal are not synchronized, so that the coupling voltage between the touch driving signal and the data voltage of the display panel varies according to the area of ​​the display panel. Accordingly, horizontal line defects or stain defects may be observed. Summary of the invention

[0006] Embodiments of the inventive concept provide a display device for reducing a horizontal line defect or a stain defect of a display panel by synchronizing a driving frequency of the display panel and a frequency of a touch driving signal.

[0007] Embodiments of the inventive concept also provide a method of driving a display device.

[0008] Embodiments of the inventive concept also provide a display system including a display device.

[0009] In an embodiment of a display device according to the present invention, the display device includes a display panel, a panel driver, a touch drive signal output layer of the touch panel, and a touch driver. The panel driver outputs a panel drive signal to the display panel. The touch driver outputs the touch drive signal to the touch drive signal output layer. The display device determines a drive frequency of the display panel according to the panel drive signal, and synchronizes the frequency of the touch drive signal with the drive frequency.

[0010] In an embodiment, the frequency of the touch driving signal may be N times the driving frequency. N may be a positive integer.

[0011] In an embodiment, the display panel may be disposed on the touch driving signal output layer.

[0012] In an embodiment, the display device may further include a touch sensing layer. The touch sensing layer may be disposed on the display panel.

[0013] In an embodiment, the touch drive signal may have a periodic function.

[0014] In an embodiment, the periodic function may be a sine wave function.

[0015] In an embodiment, the touch drive signal output layer may include a touch drive line, and the touch driver may output the touch drive signal to the touch drive line.

[0016] In an embodiment, the display device may further include a first layer and a second layer. The touch drive line may be disposed on the first layer. The second layer may be disposed on the touch drive line.

[0017] In an embodiment, the first layer and the second layer may include an organic material.

[0018] In an embodiment, the touch drive signal output layer may include first to Kth touch drive lines. K may be a positive integer. The touch driver may sequentially output the touch drive signal to the first to Kth touch drive lines.

[0019] In an embodiment, the display panel may include data lines extending in a first direction. The first to K-th touch drive lines may extend in the first direction.

[0020] In an embodiment, the panel driver may include: a gate driver configured to output first to third write gate signals. The touch drive signal may have the same voltage at a first time point, a second time point, and a third time point. The first write gate signal may be changed from an effective level to an ineffective level at a first time point. The second write gate signal may be changed from an effective level to an ineffective level at a second time point. The third write gate signal may be changed from an effective level to an ineffective level at a third time point.

[0021] In an embodiment, the same voltage may be 0V.

[0022] In an embodiment of a method for driving a display device according to the present invention, the method includes: outputting a panel driving signal to a display panel; determining a driving frequency of the display panel according to the panel driving signal; generating a touch driving signal having a frequency synchronized with the driving frequency; and outputting the touch driving signal to a touch driving signal output layer of the touch panel.

[0023] In an embodiment, the frequency of the touch driving signal may be N times the driving frequency. N may be a positive integer.

[0024] In an embodiment, the touch drive signal may have a sine wave function.

[0025] In an embodiment of a display system conceived according to the present invention, the display system includes: a display panel; a panel driver configured to output a panel driving signal to the display panel; a touch driving signal output layer of the touch panel; and a touch driver configured to determine a driving frequency of the display panel based on the panel driving signal and output a touch driving signal having a frequency synchronized with the driving frequency to the touch driving signal output layer.

[0026] In an embodiment, the frequency of the touch driving signal may be N times the driving frequency. N may be a positive integer.

[0027] In an embodiment, the display system may further include a touch sensing layer. The touch sensing layer may receive a touch element output signal from the touch element, and may output touch element sensing data to a touch driver based on the touch element output signal.

[0028] In an embodiment, the panel driver may include: a gate driver configured to output first to third write gate signals. The touch drive signal may have the same voltage at a first time point, a second time point, and a third time point. The first write gate signal may be changed from an effective level to an ineffective level at a first time point. The second write gate signal may be changed from an effective level to an ineffective level at a second time point. The third write gate signal may be changed from an effective level to an ineffective level at a third time point.

[0029] According to a display device, a method of driving a display device, and a display system including the display device, by synchronizing the driving frequency of the display panel and the frequency of the touch driving signal, horizontal line defects of the display panel and stain defects of the display panel can be reduced. Therefore, the display quality of the display panel can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other features of the present inventive concept will become more apparent by describing in detail embodiments of the present inventive concept with reference to the accompanying drawings, in which:

[0031] Figure 1 is a block diagram illustrating a display device according to an embodiment of the inventive concept;

[0032] Figure 2 The diagram is included in Figure 1 A block diagram of a touch driver and a touch drive signal output layer in a display device;

[0033] Figure 3 is a diagram of the touch elements and included in Figure 1 A block diagram of a panel driver, a touch driver, a touch drive signal output layer, a display panel and a touch sensing layer in a display device;

[0034] Figure 4 It is a graphic Figure 3 A cross-sectional view of a touch drive signal output layer, a display panel, and a touch sensing layer;

[0035] Figure 5 is a diagram showing a comparative example of an Figure 3 The touch drive signal output layer and Figure 1 A timing diagram of a driving signal of a display device;

[0036] Figure 6 is a diagram illustrating an embodiment of the inventive concept applied to Figure 3 The touch drive signal output layer and Figure 1 A timing diagram of a driving signal of a display device;

[0037] Figure 7 is a block diagram illustrating an electronic device according to an embodiment of the inventive concept; and

[0038] Figure 8 It is a diagram of Figure 7 The electronic device is implemented as an example of a smart phone. DETAILED DESCRIPTION

[0039] In this specification, the expression that a first component (or region, layer, portion, part, etc.) is "on", "connected to" or "coupled to" a second component means that the first component is directly on, directly connected to or directly coupled to the second component, or means that a third component is interposed therebetween. The same reference numerals refer to the same components. The expression "and / or" includes one or more combinations that the associated components can define.

[0040] Hereinafter, the inventive concept will be explained in detail with reference to the accompanying drawings.

[0041] Figure 1 is a block diagram illustrating a display device according to an embodiment of the inventive concept.

[0042] refer to Figure 1 , the display device includes a display panel 100 and a panel driver 110 (e.g., a first driver circuit). In an embodiment, the panel driver 110 includes a gate driver 300 (e.g., a second driver circuit) configured to provide a write gate signal GW to a pixel PX, a gamma reference voltage generator 400, a data driver 500 (e.g., a third driver circuit) connected to the pixel PX through a data line DL, and a driving controller 200 (e.g., a controller circuit) configured to control the gate driver 300, the gamma reference voltage generator 400, and the data driver 500.

[0043] In the present embodiment, the panel driver 110 outputs a panel driving signal to the display panel 100. The panel driving signal may determine a driving frequency of the display panel 100. For example, the panel driver 110 may set the panel driving signal so that the display panel 100 emits light at approximately 60 Hertz (Hz), 100 Hz, 120 Hz, etc. However, the inventive concept is not limited to the driving frequencies described above.

[0044] The display panel 100 may include at least one data line DL and at least one pixel PX connected to the data line DL. In addition, the display panel 100 may further include at least one write gate line GL for providing a write gate signal GW to the pixel PX. For example, the display panel 100 may be an organic light emitting diode (OLED) display panel or a quantum dot (QD) display panel, but the inventive concept is not limited thereto.

[0045] The display device includes a display panel 100, a driving controller 200, a gate driver 300, and a data driver 500. In an embodiment, the driving controller 200 and the data driver 500 are integrally formed. For example, in some embodiments, a single controller or a single driver may perform the functions of the driving controller 200 and the data driver 500.

[0046] The display panel 100 may have a display area on which an image is displayed and a peripheral area adjacent to the display area. In an embodiment, the gate driver 300 may be disposed in the peripheral area. In an embodiment, the gate driver 300 may be integrated in the peripheral area.

[0047] The display panel 100 may include a plurality of write gate lines GL, a plurality of data lines DL, and a plurality of pixels PX connected to the write gate lines GL and the data lines DL. The write gate lines GL may extend in a first direction D1, and the data lines DL may extend in a second direction D2 crossing the first direction D1.

[0048] The drive controller 200 may receive input image data IMG and an input control signal CONT from an external device (e.g., an application processor). For example, the input image data IMG may include red image data, green image data, and blue image data. For example, the input image data IMG may further include white image data. For example, the input image data IMG may include magenta image data, yellow image data, and cyan image data. The input control signal CONT may include a master clock signal and a data enable signal. The input control signal CONT may further include a vertical synchronization signal and a horizontal synchronization signal. For example, the vertical synchronization signal may indicate the start of a new frame, and the horizontal synchronization signal may indicate the start of a new line accompanying a frame.

[0049] The driving controller 200 may generate a first control signal CONT1 , a second control signal CONT2 , a third control signal CONT3 , and a data signal DATA based on input image data IMG and an input control signal CONT.

[0050] The driving controller 200 may generate a first control signal CONT1 for controlling the operation of the gate driver 300 based on the input control signal CONT, and may output the first control signal CONT1 to the gate driver 300. The first control signal CONT1 may include a vertical start signal and a gate clock signal.

[0051] The driving controller 200 may generate a second control signal CONT2 for controlling the operation of the data driver 500 based on the input control signal CONT, and may output the second control signal CONT2 to the data driver 500. The second control signal CONT2 may include a horizontal start signal and a load signal.

[0052] The driving controller 200 may generate a third control signal CONT3 for controlling the operation of the gamma reference voltage generator 400 based on the input control signal CONT, and may output the third control signal CONT3 to the gamma reference voltage generator 400 .

[0053] The driving controller 200 may generate a data signal DATA based on the input image data IMG. The driving controller 200 may output the data signal DATA to the data driver 500.

[0054] The gate driver 300 may generate a write gate signal GW driving the write gate line GL in response to the first control signal CONT1 received from the drive controller 200. The gate driver 300 may output the write gate signal GW to the write gate line GL. For example, the gate driver 300 may sequentially output the write gate signal GW to the write gate line GL.

[0055] The gamma reference voltage generator 400 generates a gamma reference voltage VGREF in response to the third control signal CONT3 received from the driving controller 200. The gamma reference voltage generator 400 provides the gamma reference voltage VGREF to the data driver 500. The gamma reference voltage VGREF may be a value corresponding to each data signal DATA.

[0056] For example, the gamma reference voltage generator 400 may be provided in the driving controller 200 or in the data driver 500 .

[0057] The data driver 500 may receive the second control signal CONT2 and the data signal DATA from the driving controller 200, and may receive the gamma reference voltage VGREF from the gamma reference voltage generator 400. The data driver 500 may convert the data signal DATA into a data voltage VDATA having an analog type using the gamma reference voltage VGREF. The data driver 500 may output the data voltage VDATA to the data line DL.

[0058] In an embodiment, the data driver 500 may be implemented using one or more integrated circuits. In another embodiment, the data driver 500 and the driving controller 200 may be implemented as a single integrated circuit, and the single integrated circuit may be referred to as a timing controller embedded data driver (TED).

[0059] Figure 2 The diagram is included in Figure 1 1 is a block diagram of a touch driver 600 (eg, a driver circuit) and a touch drive signal output layer 610 in a display device of FIG. 1 .

[0060] refer to Figure 1 and Figure 2 , the display device may further include a touch driver 600 and a touch driving signal output layer 610 .

[0061] In this embodiment, the touch drive signal output layer 610 may include a first touch drive line TX1, a second touch drive line TX2, a third touch drive line TX3 to a K-th touch drive line TXK. Here, K may be a positive integer. The touch driver 600 may be connected to the touch drive signal output layer 610 through the first touch drive line TX1, the second touch drive line TX2, the third touch drive line TX3 to the K-th touch drive line TXK. The touch driver 600 may output a touch drive signal to the first touch drive line TX1, the second touch drive line TX2, the third touch drive line TX3 to the K-th touch drive line TXK.

[0062] In the present embodiment, the touch driver 600 may sequentially output a touch driving signal to the first touch driving line TX1 , the second touch driving line TX2 , the third touch driving line TX3 to the K th touch driving line TXK.

[0063] In the present embodiment, the touch driving signal may have a frequency range between about 300 KHz and about 600 KHz. However, the inventive concept is not limited to this frequency range.

[0064] In an embodiment, the first to Kth touch drive lines TX1 to TXK may extend in the second direction D2. The data lines DL may extend in the second direction D2. For example, the first to Kth touch drive lines TX1 to TXK and the data lines DL may extend in the same direction.

[0065] Figure 3 The touch element 2000 is shown and is included in Figure 1 1 is a block diagram of a panel driver 110, a touch driver 600, a touch driving signal output layer 610, a display panel 100, and a touch sensing layer 620 in a display device of FIG.

[0066] refer to Figures 1 to 3 , the display device may include a panel driver 110 , a touch driver 600 , a touch driving signal output layer 610 , a display panel 100 , and a touch sensing layer 620 .

[0067] In this embodiment, the display panel 100 may be disposed on the touch driving signal output layer 610 . The touch sensing layer 620 may be disposed on the display panel 100 .

[0068] The touch drive signal output layer 610 may receive a touch drive signal from the touch driver 600. The touch drive signal output layer 610 may include first to K-th touch drive lines TX1 to TXK. The touch drive signal may be output to the first touch drive line TX1, the second touch drive line TX2, the third touch drive line TX3 to the K-th touch drive line TXK.

[0069] The display panel 100 can emit light at a driving frequency according to a panel drive signal received from the panel driver 110. For example, the driving frequency can be about 60Hz, 100Hz, 120Hz, etc. However, the inventive concept is not limited to the driving frequency described above. For example, the display panel 100 can emit light corresponding to the driving frequency. For example, the display panel 100 can emit light at about 60Hz, 100Hz, 120Hz, etc. For example, the display panel 100 can emit light at a variable frequency. In an embodiment, when the display panel 100 emits light at a variable frequency, the frequency of the touch drive signal is synchronized with the driving frequency. When the display panel 100 emits light at a variable frequency, the driving frequency can be changed in real time. Accordingly, when the display panel 100 emits light at a variable frequency, the frequency of the touch drive signal can be changed in real time. For example, whenever the driving frequency changes, the frequency of the touch drive signal can be changed.

[0070] The touch element 2000 may be charged in response to the touch driving signal. The touch element 2000 may output a touch element output signal in response to the touch driving signal.

[0071] In an embodiment, the touch element 2000 has a pen shape. The pen electrode may be provided at an end of the touch element 2000. For example, a portion of the pen electrode may be exposed outside the touch element 2000, and the remaining portion of the pen electrode may be provided inside the touch element 2000. For example, the touch element 2000 may be one of a stylus pen, an active pen, a touch pen, and an electronic pen.

[0072] The touch sensing layer 620 may receive a touch element output signal from the touch element 2000. The touch sensing layer 620 may output touch element sensing information (e.g., touch element sensing data) to the touch driver 600. For example, the touch element sensing information may include the position coordinates of the touch element 2000 on the touch sensing layer 620. In an embodiment, during a period when the touch sensing layer 620 receives the touch element output signal, the touch drive signal is not applied to the touch drive line. For example, during a period when the touch sensing layer 620 receives the touch element output signal, the voltage of the touch drive line may be a direct current (DC) voltage of 0V.

[0073] Figure 4 is a diagram illustrating Figure 3 1 is a cross-sectional view of a touch driving signal output layer 610, a display panel 100, and a touch sensing layer 620.

[0074] refer to Figure 3 and Figure 4, the touch drive line TX may be disposed on the first layer 10. The second layer 11 may be disposed on the touch drive line TX. The second layer 11 may be disposed on the first layer 10. The display panel 100 may be disposed on the second layer 11. The touch sensing layer 620 may be disposed on the display panel 100. For example, the first layer 10 may be referred to as a first substrate. For example, the second layer 11 may be referred to as a second substrate. In the present embodiment, the first layer 10 and the second layer 11 may include or may be an organic material having high heat resistance and high durability such as polyimide, polyethylene naphthalate, polyethylene terephthalate (PET), polyarylate, polycarbonate, polyetherimide (PEI) or polyethersulfone.

[0075] In the present embodiment, the touch driving line TX may be disposed under the display panel 100. Accordingly, the touch driving line TX may be more easily formed, and the process cost may be reduced.

[0076] In an embodiment, the display panel 100 includes a buffer layer BFR, first to third insulating layers IL1, IL2 and IL3, an active pattern ACT, first to third conductive patterns CP1, CP2 and CP3, a pixel defining layer PDL, a light emitting element LED and an encapsulation layer ENC. The active pattern ACT and the first to third conductive patterns CP1, CP2 and CP3 may form a transistor TR. The light emitting element LED may include a pixel electrode PE, a light emitting layer EL and a common electrode CE.

[0077] The buffer layer BFR may be disposed on the second layer 11. The buffer layer BFR may prevent impurities such as oxygen and moisture from diffusing into an upper portion of the second layer 11. The buffer layer BFR may include an inorganic insulating material such as a silicon compound or a metal oxide.

[0078] The active pattern ACT may be disposed on the buffer layer BFR. In an embodiment, the active pattern ACT includes or is a silicon semiconductor material or an oxide semiconductor material.

[0079] In an embodiment, the first insulating layer IL1 is disposed on the buffer layer BFR. The first insulating layer IL1 may cover the active pattern ACT. In another embodiment, the first insulating layer IL1 is disposed on the active pattern ACT as a pattern to expose a portion of the active pattern ACT. For example, the first insulating layer IL1 may be disposed on the active pattern ACT as a pattern to overlap with the first conductive pattern CP1. The first insulating layer IL1 may include or may be an inorganic insulating material.

[0080] The first conductive pattern CP1 may be disposed on the first insulating layer IL1. In an embodiment, the first conductive pattern CP1 includes at least one of a metal, an alloy, a conductive metal oxide, and a transparent conductive material.

[0081] The second insulating layer IL2 may be disposed on the first insulating layer IL1. In an embodiment, the second insulating layer IL2 covers the first conductive pattern CP1. The second insulating layer IL2 may include or may be an inorganic insulating material.

[0082] The second conductive pattern CP2 and the third conductive pattern CP3 may be disposed on the second insulating layer IL2. The second conductive pattern CP2 and the third conductive pattern CP3 may be electrically connected to the active pattern ACT through contact holes formed in the second insulating layer IL2 and the first insulating layer IL1. The second conductive pattern CP2 and the third conductive pattern CP3 may include or may be at least one of a metal, an alloy, a conductive metal oxide, and a transparent conductive material.

[0083] The third insulating layer IL3 may be disposed on the second insulating layer IL2. For example, the third insulating layer IL3 may cover the second conductive pattern CP2 and the third conductive pattern CP3. The third insulating layer IL3 may include or may be an inorganic insulating material.

[0084] Figure 4 The configuration, arrangement, and connection structure of the transistor TR and the plurality of insulating layers IL1, IL2, and IL3 shown in FIG. 1 are exemplary and may be changed in various ways. For example, the transistor TR may have a dual gate structure further including a fourth conductive pattern.

[0085] The pixel electrode PE may be disposed on the third insulating layer IL3. The pixel electrode PE may be electrically connected to the transistor TR through a contact hole formed in the third insulating layer IL3. In an embodiment, the pixel electrode PE includes or is at least one of a metal, an alloy, a conductive metal oxide, and a transparent conductive material.

[0086] The pixel defining layer PDL may be disposed on the third insulating layer IL3 and the pixel electrode PE. The pixel defining layer PDL may include an organic insulating material. In an embodiment, the pixel defining layer PDL further includes a light blocking material. Examples of the light blocking material of the pixel defining layer PDL may be black pigment and black dye.

[0087] The pixel defining layer PDL may cover an edge of the pixel electrode PE and expose a portion of the pixel electrode PE.

[0088] The light emitting element LED may include a pixel electrode PE, a light emitting layer EL and a common electrode CE.

[0089] In an embodiment, the light emitting layer EL includes or is a light emitting material. For example, the light emitting layer EL may include an organic light emitting material. In an embodiment, a functional layer such as a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer is additionally provided on and / or below the light emitting layer EL. The common electrode CE may be provided on the light emitting layer EL. The common electrode CE may include or may be at least one of a metal, an alloy, a conductive metal oxide, and a transparent conductive material. In an embodiment, the common electrode CE extends continuously across a plurality of pixels.

[0090] The encapsulation layer ENC may be disposed on the light emitting element LED. The encapsulation layer ENC may protect the light emitting element LED from external moisture, heat, impact, etc. The encapsulation layer ENC may include a first inorganic encapsulation layer, an organic encapsulation layer disposed on the first inorganic encapsulation layer, and a second inorganic encapsulation layer disposed on the organic encapsulation layer.

[0091] In this embodiment, the touch sensing layer 620 may include a touch sensing line RX. For example, the touch sensing line RX may receive a touch element output signal and output touch element sensing data to the touch driver 600. The touch sensing line RX may sense the position coordinates of the touch element 2000 and output the position coordinates to the touch driver 600.

[0092] In an embodiment, the touch sensing lines RX have a mesh shape. However, the inventive concept is not limited to this shape.

[0093] Figure 5 is a diagram showing a comparative example of an Figure 3 The touch drive signal output layer 610 and Figure 1 A timing diagram of a driving signal of a display device. Figure 6 is a diagram illustrating an embodiment of the inventive concept applied to Figure 3 The touch drive signal output layer 610 and Figure 1 A timing diagram of a driving signal of a display device.

[0094] refer to Figures 4 to 6 In the present embodiment, the touch drive signal TXS may be synchronized with the driving frequency of the display panel 100. For example, when the panel drive signal is set to drive the display panel 100 at approximately 120 Hz, the frequency of the touch drive signal TXS may be a multiple of approximately 120 Hz. The frequency of the touch drive signal TXS may be N times the frequency of 120 Hz. Here, N may be a positive integer. For example, when the display panel 100 is driven at approximately 120 Hz, the frequency of the touch drive signal TXS may be approximately 480 KHz. In addition, for example, when the display panel 100 is driven at approximately 120 Hz, the frequency of the touch drive signal TXS may be approximately 600 KHz.

[0095] The touch drive line TX may be disposed under the display panel 100. Accordingly, the touch drive signal TXS output to the touch drive line TX may interfere with the data voltage VDATA applied to the display panel 100. For example, the touch drive signal TXS may have a periodic function or may be a periodic signal. The touch drive signal TXS may have a periodic function so that the touch drive signal TXS is coupled with the data voltage VDATA of the data line DL applied to the display panel 100. The coupling between the touch drive signal TXS and the data voltage VDATA may vary depending on the area of ​​the display panel 100. Accordingly, the charging rate of the data voltage VDATA may change. Accordingly, the display quality of the display panel 100 may be reduced. For example, a horizontal line defect or a stain defect of the display panel 100 may be observed.

[0096] In this comparative embodiment, the frequency of the panel driving signal and the frequency of the comparative touch driving signal CTXS are not synchronized. Accordingly, a horizontal line defect or a stain defect of the display panel 100 may occur more frequently.

[0097] For example, the display panel 100 of the comparative embodiment may receive the first, second, and third comparison write gate signals CGW1, CGW2, and CGW3, and the touch drive line TX may receive the comparison touch drive signal CTXS.

[0098] At a time point when the first comparison write gate signal CGW1 changes from a valid level to an invalid level, the comparison touch drive signal CTXS may have a first comparison touch drive voltage. At a time point when the second comparison write gate signal CGW2 changes from a valid level to an invalid level, the comparison touch drive signal CTXS may have a second comparison touch drive voltage different from the first comparison touch drive voltage. At a time point when the third comparison write gate signal CGW3 changes from a valid level to an invalid level, the comparison touch drive signal CTXS may have a third comparison touch drive voltage different from the first comparison touch drive voltage and the second comparison touch drive voltage.

[0099] Accordingly, the first comparative touch driving voltage, the second comparative touch driving voltage, and the third comparative touch driving voltage may be different. Accordingly, the data voltage VDATA may be changed to different voltages due to coupling. Accordingly, a horizontal line defect or a stain defect of the display panel 100 of the comparative embodiment may be observed.

[0100] In comparison, in this embodiment, the frequency of the touch drive signal TXS is synchronized with the drive frequency of the display panel 100. In this embodiment, the touch drive signal TXS has a periodic function or is a periodic signal. In addition, in this embodiment, the periodic function may be a sine wave function. The periodic signal may be a sine wave.

[0101] For example, the display panel 100 may receive the first, second, and third write gate signals GW1, GW2, and GW3, and the touch drive line TX may receive the touch drive signal TXS.

[0102] At a first time point, the first write gate signal GW1 may be changed from an active level to an inactive level. At a second time point, the second write gate signal GW2 may be changed from an active level to an inactive level. At a third time point, the third write gate signal GW3 may be changed from an active level to an inactive level. In the present embodiment, the active level of the write gate signals GW1, GW2, and GW3 may be a logic low level, and the inactive level of the write gate signals GW1, GW2, and GW3 may be a logic high level. In an embodiment, the active level of the write gate signals GW1, GW2, and GW3 may be a logic high level, and the inactive level of the write gate signals GW1, GW2, and GW3 may be a logic low level.

[0103] In the present embodiment, the touch driving signal TXS may have the same voltage at the first time point, the second time point, and the third time point. Accordingly, when the data voltage VDATA applied to the display panel 100 is coupled with the touch driving signal TXS, the data voltage VDATA may be uniformly changed due to the same voltage. Accordingly, horizontal line defects or stain defects of the display panel 100 may be reduced. Figure 6 As shown in , the touch drive signal TXS can be continuously in phase or synchronized with all effective periods, while the comparative touch drive signal CTXS is out of phase or asynchronous with all effective periods. Figure 6 As shown in , the first pulse of the touch drive signal TXS starts at the same time point in each effective period, while the first pulse of the comparison touch drive signal CTXS starts at a different time point in each effective period. Here, the effective period is a period in which the write gate signal has an effective level.

[0104] In an embodiment, the touch driver 600 receives a vertical start signal. In an embodiment, the touch driver 600 outputs a touch drive signal TXS based on the vertical start signal. In an embodiment, the touch driver 600 receives a first control signal CONT1 from the drive controller 200, determines the driving frequency of the display panel 100 according to the vertical start signal included in the first control signal CONT1, and generates a touch drive signal TXS synchronized with the driving frequency of the display panel 100. For example, the touch driver 600 may set the frequency of the touch drive signal TXS to a multiple of the driving frequency of the display panel 100. In an embodiment, the touch driver 600 generates the touch drive signal TXS as a periodic signal such as a sine wave, so that its first pulse starts in response to an edge of the vertical start signal indicating the start of a frame. In another embodiment, the touch driver 600 receives a vertical synchronization signal, determines the driving frequency of the display panel 100 according to the vertical synchronization signal, and generates a touch drive signal TXS synchronized with the driving frequency of the display panel 100.

[0105] In an embodiment, the touch drive signal TXS may have about 0 V at the first time point, the second time point, and the third time point. For example, the average voltage of the touch drive signal TXS may be 0 V. Accordingly, horizontal line defects or stain defects of the display panel 100 may be further reduced.

[0106] Figure 7 is a block diagram illustrating an electronic device according to an embodiment of the inventive concept. Figure 8 It is a diagram of Figure 7 The electronic device is implemented as an example of a smart phone.

[0107] refer to Figure 7 and Figure 8 , the electronic device 1000 may include a processor 1010, a memory device 1020, a storage device 1030, an input / output (I / O) device 1040, a power supply 1050, and a display device 1060. Here, the display device 1060 may be Figure 1 In addition, the electronic device 1000 may further include a plurality of ports for communicating with a video card, a sound card, a memory card, a universal serial bus (USB) device, other electronic devices, and the like.

[0108] In an embodiment, Figure 8 As illustrated in , the electronic device 1000 may be implemented as a smart phone. However, the electronic device 1000 is not limited thereto. For example, the electronic device 1000 may be implemented as a cellular phone, a video phone, a smart tablet, a smart watch, a tablet PC, a car navigation system, a computer monitor, a laptop computer, and a head mounted display (HMD) device, etc.

[0109] The processor 1010 may perform various computing functions or various tasks. The processor 1010 may be a microprocessor, a central processing unit (CPU), an application processor (AP), etc. The processor 1010 may be coupled to other components via an address bus, a control bus, a data bus, etc. In addition, the processor 1010 may be coupled to an expansion bus such as a peripheral component interconnect (PCI) bus.

[0110] The processor 1010 can output the input image data IMG and the input control signal CONT to Figure 1 A drive controller 200 is provided.

[0111] The memory device 1020 may store data used for the operation of the electronic apparatus 1000. For example, the memory device 1020 may include at least one nonvolatile memory device such as an erasable programmable read-only memory (EPROM) device, an electrically erasable programmable read-only memory (EEPROM) device, a flash memory device, a phase change random access memory (PRAM) device, a resistive random access memory (RRAM) device, a nano-floating gate memory (NFGM) device, a polymer random access memory (PoRAM) device, a magnetic random access memory (MRAM) device, and a ferroelectric random access memory (FRAM) device, and / or at least one volatile memory device such as a dynamic random access memory (DRAM) device, a static random access memory (SRAM) device, and a mobile DRAM device.

[0112] The storage device 1030 may include a solid state drive (SSD) device, a hard disk drive (HDD) device, a CD-ROM device, etc. The I / O device 1040 may include input devices such as a keyboard, a keypad, a mouse device, a touch pad, and a touch screen, etc., and output devices such as a printer and a speaker, etc. In some embodiments, a display device 1060 may be included in the I / O device 1040. The power supply 1050 may provide power for the operation of the electronic device 1000. The display device 1060 may be coupled to other components via a bus or other communication link.

[0113] Despite Figure 8 The electronic device of the present invention is implemented as a smart phone, but the present invention is not limited thereto. For example, the electronic device may be a television, a monitor, a laptop computer, or a tablet PC. Alternatively, the electronic device may be a vehicle.

[0114] According to the display device, the method of driving the display device, and the display system including the display device in the present invention, since the display device synchronizes the driving frequency of the display panel with the frequency of the touch driving signal, the horizontal line defect of the display panel and the stain defect of the display panel can be reduced.

[0115] The foregoing is an illustration of the inventive concept and should not be construed as limiting thereof. Although several embodiments of the inventive concept have been described, it will be readily appreciated by those skilled in the art that many modifications may be made to the embodiments without substantially departing from the inventive concept. Accordingly, all of these modifications are intended to be included within the scope of the inventive concept.

Claims

1. A display device, comprising: Display panel; a panel driver configured to output a panel driving signal to the display panel; A touch drive signal output layer of a touch panel; as well as a touch driver configured to output a touch drive signal to the touch drive signal output layer, Wherein, the display device determines the driving frequency of the display panel according to the panel driving signal, and Wherein, the display device synchronizes the frequency of the touch drive signal with the drive frequency.

2. The display device according to claim 1, wherein: The frequency of the touch drive signal is N times the drive frequency, and Wherein, N is a positive integer.

3. The display device according to claim 1, wherein: The display panel is disposed on the touch drive signal output layer.

4. The display device according to claim 3, further comprising a touch sensing layer, in, The touch sensing layer is disposed on the display panel.

5. The display device according to claim 1, wherein: The touch driving signal has a periodic function.

6. The display device according to claim 5, wherein: The periodic function is a sine wave function.

7. The display device according to claim 1, wherein: The touch drive signal output layer includes a touch drive line, and The touch driver outputs the touch drive signal to the touch drive line.

8. The display device according to claim 7, further comprising a first layer and a second layer, in, The touch drive line is arranged on the first layer, and Wherein, the second layer is arranged on the touch drive line.

9. The display device according to claim 8, wherein: The first layer and the second layer include organic materials.

10. The display device according to claim 1, wherein: The touch drive signal output layer includes first to Kth touch drive lines, Wherein, K is a positive integer, and The touch driver is configured to sequentially output the touch drive signal to the first to Kth touch drive lines.

11. The display device according to claim 10, wherein: The display panel includes data lines extending in a first direction, and Wherein, the first to Kth touch driving lines extend in the first direction.

12. The display device according to any one of claims 1 to 11, wherein: The panel driver comprises: a gate driver configured to output a first write gate signal, a second write gate signal, and a third write gate signal, The touch drive signal has the same voltage at the first time point, the second time point and the third time point, wherein the first write gate signal changes from a valid level to an invalid level at the first time point, wherein the second write gate signal changes from the valid level to the invalid level at the second time point, and The third write gate signal is changed from the valid level to the invalid level at the third time point.

13. The display device according to claim 12, wherein: The same voltage is 0V.

14. A method for driving a display device, the method comprising: outputting a panel driving signal to the display panel; determining a driving frequency of the display panel according to the panel driving signal; generating a touch driving signal having a frequency synchronized with the driving frequency; as well as The touch driving signal is output to a touch driving signal output layer of the touch panel.

15. The method according to claim 14, wherein: The frequency of the touch drive signal is N times the drive frequency, and Wherein, N is a positive integer.

16. The method according to claim 14 or 15, wherein: The touch driving signal has a sine wave function.

17. A display system comprising: Display panel; a panel driver configured to output a panel driving signal to the display panel; A touch drive signal output layer of a touch panel; as well as A touch driver is configured to determine a driving frequency of the display panel based on the panel driving signal, and output a touch driving signal having a frequency synchronized with the driving frequency to the touch driving signal output layer.

18. The display system according to claim 17, wherein: The frequency of the touch drive signal is N times the drive frequency, and Wherein, N is a positive integer.

19. The display system according to claim 17, further comprising a touch sensing layer, in, The touch sensing layer is configured to receive a touch element output signal from a touch element and output touch element sensing data to the touch driver based on the touch element output signal.

20. The display system according to any one of claims 17 to 19, wherein: The panel driver comprises: a gate driver configured to output a first write gate signal, a second write gate signal, and a third write gate signal, The touch drive signal has the same voltage at the first time point, the second time point and the third time point, wherein the first write gate signal changes from a valid level to an invalid level at the first time point, wherein the second write gate signal changes from the valid level to the invalid level at the second time point, and The third write gate signal is changed from the valid level to the invalid level at the third time point.

Images