KR102655484B1 - Touch Device And Method Of Driving The Same - Google Patents

Abstract

The present invention includes a touch display panel that displays an image and detects a touch; a plurality of touch electrodes disposed on the touch display panel; a plurality of touch wires respectively connected to the plurality of touch electrodes; When the active pen is in a spaced state away from the touch display panel, an uplink signal is generated using a first bias current in an uplink section that detects the active pen, and the active pen and the tilt of the active pen are controlled. In the uplink section that detects the uplink signal, the uplink signal is generated using a second bias current that is smaller than the first bias current, and in the uplink section that detects the passive pen, a third bias current that is smaller than the second bias current is used. A touch display device is provided including a touch display driver that generates the uplink signal and applies the uplink signal to the plurality of touch electrodes.

Description

Touch display device and its driving method {Touch Device And Method Of Driving The Same}

The present invention relates to a touch display device, and in particular, by changing the bias current according to the purpose of the uplink section and the state of the active pen, the hover state characteristics are improved without increasing power consumption and the contact state power consumption is reduced. It relates to devices and their driving methods.

In keeping with the information age, the display field has also developed rapidly, and in response to this, the liquid crystal display device (LCD) has become a flat panel display device (FPD) with the advantages of thinner, lighter, and lower power consumption. ), plasma display panel device (PDP), organic light emitting diode display device (OLED), and field emission display device (FED) were introduced, replacing the existing cathode ray tube (CRT). It is rapidly replacing cathode ray tube (CRT).

Recently, a touch display device (or touch screen) with a touch panel attached to the display panel has been attracting attention.

The touch display device can be used as an output means for displaying images and at the same time as an input means for receiving user commands by touching a specific part of the displayed image. The touch panel of the touch display device is operated according to the location information detection method. It can be divided into pressure-sensitive, electrostatic, infrared, and ultrasonic methods.

Such a touch display device can be manufactured by attaching a separate touch panel to the display panel or by forming the touch panel on the substrate of the display panel and integrating it.

In particular, in recent years, in order to slim portable terminals such as smartphones and tablet PCs, in-cell type touch display devices have been developed in which the electrodes and wiring that make up the touch panel are formed on the substrate of the display panel and integrated. Demand is increasing.

Meanwhile, since touch input using the user's fingers is relatively inefficient, the demand for sophisticated touch input using electronic pens is increasing. Accordingly, touch input using passive pens such as fingers and electronic pens is increasing. A multi-pen type touch display device that can simultaneously detect touch input by the same active pen is being developed.

This multi-pen type touch display device can detect the touch input of the active pen in the hover state where the active pen is spaced away from the touch display panel or in the contact state where the active pen is in contact with the touch display panel. However, there is a problem in that it is difficult to smoothly detect the active pen's touch input in the hover state.

In addition, in order to improve the characteristics of the hover state, the maximum height at which the active pen can be recognized from the touch display panel must be increased. To do this, the bias current of the uplink signal transmitted from the touch display panel to the active pen must be increased. current) needs to be increased, but there is a problem that power consumption increases accordingly.

The present invention was proposed to solve this problem, and provides a touch display device and a driving method thereof that improve hover state characteristics without increasing power consumption by changing the bias current of the uplink signal depending on the type of uplink section. The purpose is to

Another object of the present invention is to provide a touch display device and a driving method for reducing power consumption in a contact state by changing the bias current of the uplink signal according to the state of the active pen.

In order to solve the above problems, the present invention includes a touch display panel that displays an image and detects a touch; a plurality of touch electrodes disposed on the touch display panel; a plurality of touch wires respectively connected to the plurality of touch electrodes; When the active pen is in a spaced state away from the touch display panel, an uplink signal is generated using a first bias current in an uplink section that detects the active pen, and the active pen and the tilt of the active pen are controlled. In the uplink section that detects the uplink signal, the uplink signal is generated using a second bias current that is smaller than the first bias current, and in the uplink section that detects the passive pen, a third bias current that is smaller than the second bias current is used. A touch display device is provided including a touch display driver that generates the uplink signal and applies the uplink signal to the plurality of touch electrodes.

Additionally, the touch display driver may include the uplink section for detecting the active pen when the active pen is in contact with the touch display panel, and the touch display driver for detecting the active pen and the tilt of the active pen. The uplink signal may be generated using the third bias current in an uplink section and an uplink section detecting the passive pen, respectively, and the uplink signal may be applied to the plurality of touch electrodes.

In addition, the touch display panel displays an image during the display section of the N-th frame, detects a touch during the touch section of the N-th frame, and the touch section includes a 1st to 16th LHB section, and the 1LHB The uplink section of the section is a beacon section that transmits a beacon signal containing information about the touch display panel to the active pen, and the uplink sections of the 2nd, 5th, 9th, and 13th LHB sections are respectively The first to fourth active pen sections transmit an active signal for detecting the active pen to the active pen, and the third active pen section further transmits a tilt signal for detecting the tilt of the active pen. and the uplink sections of the 3rd, 6th, 7th, 14th, and 15th LHB sections each transmit additional signals containing additional information about the touch display panel to the active pen. It is the fifth data section, and the uplink section of the 4th, 8th, 10th, 11th, 12th, and 16th LHB sections is a section that transmits a passive signal for detecting the passive pen to the active pen, respectively. It may be the 1st to 2nd passive pen section.

And, in the case of the separation state, the touch display driving unit uses the first bias current in the beacon section, the first, second, and fourth active pen sections, and the first to fifth data sections to connect the uplink. Generate a signal, generate the uplink signal with the second bias current in the third active pen section, and generate the uplink signal with the third bias current in the first to sixth passive pen sections. there is.

In addition, in the case of the contact state, the touch display driver generates the uplink signal with the second bias current in the third active pen section and the beacon section and the first, second, and fourth active pen sections. The uplink signal may be generated using the third bias current in the pen section, the first to fifth data sections, and the first to sixth passive pen sections.

And, the bias current for the uplink signal in the beacon section of the (N+1)th frame may be determined according to the bias current for the uplink signal in the fourth active pen section of the Nth frame.

In addition, the first bias current is 13 μA to 17 μA, the second bias current is 8 μA to 12 μA, and the third bias current is 3 μA to 7 μA. The first, second, and third bias currents are 15 μA, 10 μA, and 5 μA, respectively. It can be.

Meanwhile, the present invention provides a step of generating an uplink signal using a first bias current in an uplink section where the touch display driver detects the active pen when the active pen is in a spaced state from the touch display panel. and; generating, by the touch display driver, the uplink signal using a second bias current smaller than the first bias current in the uplink section in which the active pen and the tilt of the active pen are detected; generating, by the touch display driver, the uplink signal with a third bias current smaller than the second bias current in the uplink section where the passive pen is detected; Provided is a method of driving a touch display device including the step of applying, by the touch display driver, the uplink signal to the plurality of touch electrodes.

And, the method of driving the touch display device includes, when the active pen is in a contact state with the touch display panel, the touch display driver includes the uplink section for detecting the active pen, the active pen, and The method may further include generating the uplink signal using the third bias current in the uplink section for detecting the tilt of the active pen and the uplink section for detecting the passive pen, respectively.

The present invention has the effect of improving hover state characteristics without increasing power consumption by changing the bias current of the uplink signal depending on the type of uplink section.

Additionally, the present invention has the effect of reducing power consumption in the contact state by changing the bias current of the uplink signal depending on the state of the active pen.

1 is a diagram illustrating a multi-pen type touch display device according to an embodiment of the present invention.
FIGS. 2A, 2B, and 2C are diagrams showing a no-touch state, a hover state, and a contact state, respectively, of a multi-pen type touch display device according to an embodiment of the present invention.
Figure 3 is a diagram showing one frame of a multi-pen type touch display device according to an embodiment of the present invention.
Figure 4 is a diagram showing an uplink section of a multi-pen type touch display device according to an embodiment of the present invention.

Hereinafter, the touch display device and its driving method according to the present invention will be described with reference to the attached drawings.

Figure 1 is a diagram showing a multi-pen type touch display device according to an embodiment of the present invention, and a self-capacitance type in-cell type touch display device is used as an example.

As shown in FIG. 1, the multi-pen type touch display device 110 according to an embodiment of the present invention includes a touch display panel 120 and a touch display driver 130.

The touch display panel 120 serves to display images and detect touches, and connects a plurality of touch electrodes (TE) to a plurality of touch electrodes (TE) and a touch display driver 130, respectively, for touch detection. It includes a plurality of touch wires (TL).

A plurality of touch electrodes (TE) may be arranged in a matrix form.

Although not shown, the touch display panel 120 includes a first substrate for image display, a gate wire and data wire disposed on the top of the first substrate and crossing each other to define the pixel area, and a gate wire disposed in the pixel area. And it may include a thin film transistor connected to the data wire, and a pixel electrode disposed in the pixel area and connected to the thin film transistor.

The touch display panel 120 may be an organic light emitting diode panel or a liquid crystal panel. The touch display panel 120, which is an organic light emitting diode panel, emits light connected to a pixel electrode. It may further include a diode and a protective layer covering the light emitting diode, and the touch display panel 120, which is a liquid crystal panel, includes a second substrate facing the first substrate and spaced apart, a common electrode below the second substrate, and a second substrate. It may further include a liquid crystal layer disposed between the first and second substrates.

The touch display driver 130 plays a role in detecting the touch position. It applies touch scan signals to a plurality of touch electrodes (TE) of the touch display panel 120 and uses a passive pen (PP) such as a finger. ) The location of the touch input on the touch display panel 120 can be detected by analyzing changes in capacitance of a plurality of touch electrodes (TE) according to the touch input.

In addition, the touch display driver 130 transmits an uplink signal to an active pen (AP) such as an electronic pen through a plurality of touch electrodes (TE) of the touch display panel 120, By analyzing the downlink signal according to the touch input received from the active pen (AP) through the plurality of touch electrodes (TE) of the touch display panel 120, the location of the touch input on the touch display panel 120 is determined. It can be detected.

Here, the touch display driver 130 generates an uplink signal using a bias current, and the amplitude of the uplink signal may be proportional to the bias current.

Although not shown, the active pen (AP) includes a pen tip that receives an uplink signal or transmits a downlink signal, a pressure part that senses the pressure of the pen tip, and a pressure part that detects the frequency of the received uplink signal and responds to the uplink signal. It may include a control unit that generates a synchronized downlink signal.

Although not shown, the touch display driver 130 may include a timing control unit, a data driver, and a gate driver for image display, a touch control unit for touch detection, and a touch driver, and the data driver and the touch driver are one unit. The touch data driver may be in the form of a source readout integrated circuit (SRIC), and the touch control unit may be in the form of a microcontroller unit (MICOM).

The timing control unit uses a number of timing signals such as video signals and data enable signals, horizontal synchronization signals, vertical synchronization signals, and clocks transmitted from external systems such as graphics cards or TV systems to generate touch synchronization signals, video data, and data. A control signal and a gate control signal can be generated, the generated touch synchronization signal can be transmitted to the microcomputer, the generated image data and data control signal can be transmitted to the touch data driver, and the generated gate control signal can be transmitted to the gate driver.

The microcomputer generates a touch scan signal using the touch synchronization signal transmitted from the timing control unit, transmits the generated touch scan signal to the touch data driver, and analyzes the touch detection signal received from the touch data driver to detect The location of the touch input can be detected.

And, the microcom unit generates an uplink signal using the touch synchronization signal transmitted from the timing control unit, transmits the generated uplink signal to the touch data driving unit, and analyzes the downlink signal received from the touch data driving unit to activate the active pen. The location of the touch input can be detected.

The touch data driver may generate a data signal (data voltage) using the data control signal and image data transmitted from the timing control unit, and apply the generated data signal to the data wire of the touch display panel 120.

And, the touch data driving unit applies the touch scan signal transmitted from the microcomputer unit to the touch electrode (TE) through the touch wire (TL), and transmits the capacitance signal of the touch electrode (TE) to the microcomputer through the touch wire (TL). It can be passed on as wealth.

In addition, the touch data driver transmits the uplink signal transmitted from the microcomputer to the active pen (AP) through the touch wire (TL) and touch electrode (TE), and connects the touch wire (TL) and touch electrode (TE) to the active pen (AP). A downlink signal can be received from the active pen (AP).

The gate driver may generate a gate signal (gate voltage) using a gate control signal transmitted from the timing control unit and apply the generated gate signal to the gate wiring of the touch display panel 120.

The gate driver may be of the gate-in-panel (GIP) type formed together on the substrate of the touch display panel 120 on which the gate wiring, data wiring, touch wiring (TL), and pixel area are formed.

This multi-pen type touch display device 110 has different states depending on the separation distance between the touch display panel 120 and the active pen (AP), which will be described with reference to the drawings.

FIGS. 2A, 2B, and 2C are diagrams illustrating a no-touch state, a hover state, and a contact state, respectively, of a multi-pen type touch display device according to an embodiment of the present invention, which will be described with reference to FIG. 1.

As shown in FIG. 2A, in the multi-pen type touch display device 110 according to an embodiment of the present invention, the separation distance (GD) between the touch display panel 120 and the active pen (AP) is the active pen (AP). If AP) is greater than the maximum height that can be recognized (Hmax), there is a no-touch state (NS) in which the active pen (AP) is not recognized.

As shown in Figure 2b, in the multi-pen type touch display device 110 according to an embodiment of the present invention, the separation distance (GD) between the touch display panel 120 and the active pen (AP) is the active pen (AP). If AP) is less than or equal to the maximum height that can be recognized (Hmax) and greater than 0, it has a hover state (HS) that recognizes the active pen (AP) spaced away from the touch display panel 120.

As shown in FIG. 2C, in the multi-pen type touch display device 110 according to an embodiment of the present invention, when the separation distance (GD) between the touch display panel 120 and the active pen (AP) is 0. , has a contact state (CS) that recognizes the active pen (AP) contacting the touch display panel 120.

As such, the multi-pen type touch display device 110 according to an embodiment of the present invention is in a no-touch state (NS) and a hover state depending on the separation distance (GD) between the touch display panel 120 and the active pen (AP). (HS) and contact state (CS), and the no-touch state (NS) and hover state (HS) can also be classified as a spaced state in which the touch display panel 120 and the active pen (AP) are spaced apart from each other.

Also, the larger the maximum height (Hmax) at which the active pen (AP) can be recognized, the better the hover state (HS) characteristics can be.

Meanwhile, this multi-pen type touch display device 110 is driven by dividing a section of one frame into a display section that displays an image and a touch section that detects a touch, which will be explained with reference to the drawings.

FIG. 3 is a diagram illustrating one frame of a multi-pen type touch display device according to an embodiment of the present invention, which will be described with reference to FIG. 1.

As shown in FIG. 3, the multi-pen type touch display device 110 according to an embodiment of the present invention is driven in the long horizontal blank (LHB) method. In the LHB method, 1 frame (1F) The section is divided into a display section (DP) that displays an image and a touch section (TP) that detects touch. The touch section (TP) is divided into multiple LHB sections, and the display section (DP) is divided into multiple LHB sections. It can be distributed and placed in between.

In addition, each of the plurality of LHB sections includes an uplink section for transmitting a signal from the touch display panel 120 to the active pen (AP) and detecting the passive pen (PP) and active pen (AP), and an active pen (AP) ) can be divided into a downlink section for transmitting a signal to the touch display panel 120 and detecting a touch.

For example, multiple LHB sections may include first to 16th LHB sections (L1 to L16).

Then, the touch display panel 120 is divided into a plurality of display blocks and a plurality of touch blocks, and the plurality of display blocks are separately driven during a plurality of display sections DP to display an image, and the images are displayed between the first to 16th LHB sections. A touch can be detected by separately driving a plurality of touch blocks during (L1 to L16).

During the display period (DP), a common voltage is applied to the touch electrode (TE) of the touch display panel 120, a gate voltage and a data voltage are applied to the gate wiring and data wiring of the touch display panel 120, respectively, and the touch The display panel 120 can display images.

During the touch period (TP), a touch scan signal or uplink signal is applied to the touch electrode (TE) of the touch display panel 120, the capacitance change or downlink signal is analyzed through the touch electrode (TE), and the touch electrode (TE) is applied to the touch electrode (TE). The display panel 120 can detect a touch.

The touch scan signal and the uplink signal may each be an alternating current (AC) type signal containing multiple pulses, or a direct current (DC) type signal with a constant voltage.

An alternating current signal may consist of multiple pulses with a specific frequency, and each pulse may have various shapes such as a square wave, triangle wave, sine wave, or trapezoidal wave.

For example, the touch position of the passive pen (PP) or the position of the active pen (AP) can be accurately detected in the entire area of the touch display panel 120 by the AC signal, and the touch display panel 120 can be accurately detected by the DC signal. The position and tilt of the active pen (AP) can be accurately detected in some areas of (120).

The number of LHB sections constituting the touch section (TP) and the allocation of the multiple LHB sections may vary depending on the embodiment.

This multi-pen type touch display device 110 changes the bias current of the uplink signal depending on the type of uplink section and the state of the active pen, which will be explained with reference to the drawings.

FIG. 4 is a diagram illustrating an uplink section of a multi-pen type touch display device according to an embodiment of the present invention, which will be described with reference to FIGS. 1 to 3.

As shown in FIG. 4, the touch section (TP) of one frame (1F) of the multi-pen type touch display device 110 according to an embodiment of the present invention includes a plurality of LHB sections. The uplink section may include at least one beacon section (BCP), at least one active pen section (APP), at least one passive pen section (PPP), and at least one data section (DTP).

For example, the plurality of LHB sections include 1st to 16th LHB sections (L1 to L16), and the uplink section of the 1st LHB section (L1) includes the touch display panel 120 such as panel ID, panel status, and panel type. ) may be a beacon section (BCP) that transmits a beacon signal containing information about the ) may be the first to fourth active pen sections (APP1 to APP4) that transmit an active signal for detecting the active pen (AP) to the active pen (AP), respectively, and the 9th LHB section (L9) In the third active pen section (APP3), which is the uplink section, an active tilt signal to which a tilt signal for detecting the tilt of the active pen (AP) is added may be transmitted to the active pen (AP).

In the embodiment of FIG. 4, adding a tilt signal to the third active section (APP3) is used as an example, but in other embodiments, a tilt signal may be added to at least one of the first to fourth active sections (APP1 to APP4). there is.

And, the uplink sections of the 3rd, 6th, 7th, 14th, and 15th LHB sections (L3, L6, L7, L14, and L15) each send additional signals containing additional information about the touch display panel 120. It may be the 1st to 5th data sections (DTP1 to DTP5) transmitted to the active pen (AP), and the 4th, 8th, 10th, 11th, 12th, and 16th LHB sections (L4, L8, L10, L11 , L12, L16) may be the first to sixth passive pen sections (PPP1 to PPP6) that transmit passive signals for detecting the passive pen (PP) to the passive pen (PP), respectively.

Here, the touch display driving unit 130 uses bias current to generate uplink signals such as beacon signals, active signals, active tilt signals, additional signals, and passive signals, including the type of uplink section and the active pen (AP). An uplink signal can be generated with a different bias current depending on the state.

Specifically, when the active pen (AP) is in the no-touch state (NS) and the hover state (HS), improvement in the characteristics of the hover state (HS) is required, so the beacon section that transmits information about the touch display panel 120 ( BCP), first, second, and fourth active pen sections (APP1, APP2, APP4) that detect the active pen (AP), and first to fifth sections that transmit additional information about the touch display panel 120 In the data section (DTP1 to DTP5), an uplink signal can be generated with a first bias current (Ib1) of a relatively large current value.

In addition, when the active pen (AP) is in the no-touch state (NS) and the hover state (HS), the first active pen (AP) and the third active pen section (APP3) that detects the tilt of the active pen (AP) An uplink signal can be generated with a second bias current (Ib2) having an intermediate current value that is smaller than the bias current (Ib1). (Ib1>Ib2)

In addition, when the active pen (AP) is in the no-touch state (NS) and the hover state (HS), the second bias current ( An uplink signal can be generated with a third bias current (Ib3) of a relatively small current value smaller than Ib2). (Ib2>Ib3)

For example, the first bias current (Ib1) may be from about 13 μA to about 17 μA, the second bias current (Ib3) may be from about 8 μA to about 12 μA, and the third bias currents (Ib1, Ib2, Ib3) may be They may be about 315 μA, about 10 μA, and about 75 μA, respectively.

That is, when the active pen (AP) is in the no-touch state (NS) and hover state (HS), the first, second, and fourth active pen sections (APP1, APP2, and APP4) that detect the active pen (AP) By generating an uplink signal using the first bias current (Ib1) of a relatively high current value, the first to second devices that improve the hover state characteristics of the active pen (AP) and simultaneously detect the passive pen (PP) In the 6 passive pen sections (PPP1 to PPP6), the uplink signal is generated using the third bias current (Ib3) with a relatively low current value, thereby offsetting the increase in power consumption due to the use of the first bias current (Ib1). You can.

For example, in the multi-pen type touch display device according to the comparative example, regardless of the state of the active pen (AP), there is always a beacon section (BCP), first to fourth active pen sections (APP1 to APP4), and first to fourth active pen sections (APP1 to APP4). An uplink signal is generated using a bias current (Ib) of about 10 μA in both the fifth data section (DTP1 to DTP5) and the first to sixth passive pen section (PPP1 to PPP6), and thus the multi The pen-type touch display device has a maximum height (Hmax) at which an active pen (AP) of about 8 mm can be recognized and a current consumption of about 303 mA.

On the other hand, in the multi-pen type touch display device 110 according to an embodiment of the present invention, a device detects the active pen (AP) when the active pen (AP) is in the no-touch state (NS) and the hover state (HS). In the 1st, 2nd, and 4th active pen sections (APP1, APP2, APP4), the first to sixth pens generate an uplink signal using the first bias current (Ib1) of about 15 mA and detect the passive pen (PP). In the passive pen section (PPP1 to PPP6), an uplink signal is generated using a third bias current (Ib3) of about 5 mA, and accordingly, the multi-pen type touch display device 110 according to an embodiment of the present invention is about 5 mA. It has a maximum height (Hmax) at which an 11mm active pen (AP) can be recognized and a current consumption of approximately 304mA.

Therefore, the multi-pen type touch display device 110 according to an embodiment of the present invention has a maximum height (Hmax) of about 11 mm, which is higher than the maximum height (Hmax) of about 8 mm in the comparative example, and a current consumption of about 303 mA in the comparative example. Since it has a current consumption of about 304 mA, which is similar to that of

In addition, when the active pen (AP) is in the contact state (CS), improvement in the characteristics of the hover state (HS) is not required, so the active pen (AP) and the third active pen section that detects the tilt of the active pen (AP) (APP3) generates an uplink signal with a second bias current (Ib2) of an intermediate current value and detects a beacon section (BCP) that transmits information about the remaining touch display panel 120 and an active pen (AP). first, second, and fourth active pen sections (APP1, APP2, APP4), first to fifth data sections (DTP1 to DTP5) that transmit additional information about the touch display panel 120, and a passive pen In the first to sixth passive pen sections (PPP1 to PPP6) that detect (PP), an uplink signal can be generated with a third bias current (Ib3) of a relatively small current value.

That is, when the active pen (AP) is in the contact state (CS), not only the first to sixth passive pen sections (PPP1 to PPP6) for detecting the passive pen (PP), but also the first for detecting the active pen (AP) , power consumption can be reduced by generating an uplink signal in the second and fourth active pen sections (APP1, APP2, APP4) using the third bias current (Ib3) with a relatively low current value.

For example, while the multi-pen type touch display device according to the comparative example has a current consumption of about 303 mA, the multi-pen type touch display device 110 according to an embodiment of the present invention uses an active pen (AP) to contact In the case of the state (CS), the first to sixth passive pen sections (PPP1 to PPP6) that detect the passive pen (PP) and the first, second, and fourth active pen sections (APP1) that detect the active pen (AP) , APP2, APP4) generate an uplink signal using a third bias current (Ib3) of about 5 mA, and accordingly, the multi-pen type touch display device 110 according to an embodiment of the present invention consumes about 291 mA. It has electric current.

Therefore, the multi-pen type touch display device 110 according to an embodiment of the present invention has a current consumption of about 291 mA, which is about 13 mA less than the current consumption of about 303 mA in the comparative example, so the active pen (AP) is in a contact state ( In the case of CS), power consumption can be reduced.

Meanwhile, in the multi-pen type touch display device 110 according to an embodiment of the present invention, the bias current for the uplink signal of the beacon section (BCP) of the (N+1)th frame is the fourth active signal of the Nth frame. It can be determined according to the bias current for the uplink signal of the pen section (APP4).

For example, when the active pen (AP) is in the no-touch state (NS) and the hover state (HS), the uplink signal of the fourth active pen section (APP4) of the Nth frame is the first bias with a relatively high current value. It is generated using the current (Ib1), and accordingly, the uplink signal of the beacon section (BCP) of the (N+1)th frame can also be generated using the first bias current (Ib1).

And, when the active pen (AP) is in the contact state (CS), the uplink signal of the fourth active pen section (APP4) of the Nth frame is generated using the third bias current (Ib3) with a relatively low current value. Accordingly, the uplink signal of the beacon section (BCP) of the (N+1)th frame can also be generated using the third bias current (Ib3).

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art may make various modifications and changes to the present invention without departing from the technical spirit and scope of the present invention as set forth in the claims below. You will understand that you can do it.

110: touch display device 120: touch display panel
TE: Touch electrode TL: Touch wiring
130: Touch display driving unit

Claims (9)

a touch display panel that displays images and detects touches;
a plurality of touch electrodes disposed on the touch display panel;
a plurality of touch wires respectively connected to the plurality of touch electrodes;
When the active pen is in a spaced state away from the touch display panel, an uplink signal is generated using a first bias current in an uplink section that detects the active pen, and the active pen and the tilt of the active pen are controlled. In the uplink section that detects the uplink signal, the uplink signal is generated using a second bias current that is smaller than the first bias current, and in the uplink section that detects the passive pen, a third bias current that is smaller than the second bias current is used. A touch display driver that generates the uplink signal and applies the uplink signal to the plurality of touch electrodes.
A touch display device including.
According to claim 1,
The touch display driver, when the active pen is in contact with the touch display panel, generates the uplink signal with the second bias current in the uplink section to detect the active pen and the tilt of the active pen. generates the uplink signal with the third bias current in the uplink section for detecting the active pen and the uplink section for detecting the passive pen, respectively, and transmits the uplink signal to the plurality of A touch display device that applies touch electrodes.
According to claim 2,
The touch display panel displays an image during the display section of the N-th frame and detects a touch during the touch section of the N-th frame,
The touch section includes the first to 16th LHB sections,
The uplink section of the first LHB section is a beacon section that transmits a beacon signal containing information about the touch display panel to the active pen,
The uplink sections of the 2nd, 5th, 9th, and 13th LHB sections are the first to fourth active pen sections that transmit an active signal for detecting the active pen to the active pen, respectively, and the third active pen section transmits an active signal for detecting the active pen to the active pen. In the pen section, a tilt signal for detecting the tilt of the active pen is additionally transmitted to the active pen,
The uplink sections of the 3rd, 6th, 7th, 14th, and 15th LHB sections are first to fifth data sections that transmit additional signals containing additional information about the touch display panel to the active pen, respectively. ego,
The uplink sections of the 4th, 8th, 10th, 11th, 12th, and 16th LHB sections are first and second passive pens that transmit passive signals for detecting the passive pen to the active pen, respectively. Sectional touch display device.
According to claim 3,
In the case of the separation state, the touch display driver transmits the uplink signal with the first bias current in the beacon section, the first, second, and fourth active pen sections, and the first to fifth data sections. a touch display device generating the uplink signal with the second bias current in the third active pen section and generating the uplink signal with the third bias current in the first to sixth passive pen sections. .
According to claim 3,
In the case of the contact state, the touch display driver generates the uplink signal with the second bias current in the third active pen section and the beacon section and the first, second, and fourth active pen sections. and a touch display device that generates the uplink signal with the third bias current in the first to fifth data sections and the first to sixth passive pen sections.
According to claim 3,
A touch display device wherein the bias current for the uplink signal in the beacon section of the (N+1)th frame is determined according to the bias current for the uplink signal in the fourth active pen section of the Nth frame.
According to claim 3,
The first bias current is 13 μA to 17 μA, the second bias current is 8 μA to 12 μA, and the third bias current is 153 μA, 10 μA, and 75 μA, respectively.
When the active pen is separated from the touch display panel,
generating, by a touch display driver, an uplink signal using a first bias current in an uplink section that detects the active pen;
generating, by the touch display driver, the uplink signal using a second bias current smaller than the first bias current in the uplink section in which the active pen and the tilt of the active pen are detected;
generating, by the touch display driver, the uplink signal with a third bias current smaller than the second bias current in the uplink section where the passive pen is detected;
The touch display driver applying the uplink signal to a plurality of touch electrodes.
A method of driving a touch display device including.
According to claim 8,
Before the touch display driver applies the uplink signal to a plurality of touch electrodes,
When the active pen is in contact with the touch display panel,
generating, by the touch display driver, the uplink signal with the second bias current in the uplink section where the active pen and the tilt of the active pen are detected;
Generating, by the touch display driver, the uplink signal with the third bias current in the uplink section detecting the active pen and the uplink section detecting the passive pen, respectively.
A method of driving a touch display device further comprising:

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