KR102353360B1 - Display Device Including Touch Panel And Method For Driving the Same - Google Patents

Abstract

The present invention provides a touch panel capable of reducing power consumption by stopping the driving of the driving circuit driving the display panel or the touch sensing circuit driving the touch panel when driving of the driving circuit driving the display panel or the touch panel is unnecessary. A display device and a method of driving the same, comprising: receiving a first abnormal signal when an abnormality occurs in a connection between an external set and a timing controller, and receiving a second abnormal signal when an abnormality occurs in a connection between an external set and an MCU; When more than one signal is input, driving of the gate driver and source driver IC for driving the display panel is stopped, and when the second abnormal signal is input, driving of the touch sensing IC for driving the touch panel is stopped.

Description

Display Device Including Touch Panel And Method For Driving the Same

The present invention relates to a display device, and in particular, a driving method for determining whether an image is input or whether a touch panel is driven, and driving the display panel and the touch panel when the image is not input or the touch panel is not driven The present invention relates to a display device that reduces power consumption by stopping an operation of a circuit.

Specific examples of the flat panel display include a liquid crystal display device (LCD), an organic light emitting display device (organic emitting display device), a plasma display panel device (PDP), and a quantum dot display device (Quantum Dot Display Device). ), a field emission display device (FED), an electrophoretic display device (EPD), etc., which in common use a flat panel display panel that implements an image as an essential component; A flat panel display panel has a structure in which a pair of transparent insulating substrates are bonded to each other with a unique light emitting or polarized light or other optical material layer interposed therebetween.

On the other hand, there is an increasing demand for adding a touch screen capable of recognizing a touch part through a human hand or a separate input means and transmitting separate information in response thereto to such a display device.

As described above, the display device to which the touch screen is added consumes relatively high power because both the display panel and the touch panel must be driven. In particular, a conventional display device to which a touch screen is added unnecessarily drives both the display panel and a driving circuit for driving the touch panel even when the display panel or the touch panel is not driven, thereby generating unnecessary power consumption.

The present invention has been devised to solve the above problem, and when driving of a driving circuit driving a display panel or a touch panel is unnecessary, by stopping the driving of the driving circuit driving the display panel or the touch sensing circuit driving the touch panel. An object of the present invention is to provide a display device including a touch panel capable of reducing power consumption and a method of driving the same.

In order to solve the above problems, in a display device including a touch panel according to the present invention, when an abnormality occurs in a connection between an external set and a timing controller of the display device, a first abnormal signal is transmitted between the external set and an MCU for touch sensing. When an abnormality occurs in the connection, the second abnormal signal is input, and when the first abnormal signal is input, driving of the gate driver and source driver IC that drives the display panel is stopped, and when the second abnormal signal is input, the touch panel is turned off Stops driving of the driven touch sensing IC.

On the other hand, the display device including the touch panel according to the present invention receives a third abnormal signal when an image input from the outside is not input, and the gate driver and the source driver IC according to any one of the first and third abnormal signals. operation can be stopped.

At this time, when the first selection signal is input from the outside, the driving of the gate driver and the source driver IC is stopped by the first abnormal signal, and when the second selection signal is input from the outside, the gate driver by the third abnormal signal and driving of the source driver IC is stopped.

A display device including a touch panel according to the present invention is a circuit for detecting whether a connection between an MCU for touch sensing or a timing controller for driving the display device and an external set is in an abnormal state, and driving the display panel in case of an abnormal state Alternatively, unnecessary power consumption is reduced by not driving at least one of the circuits for driving the touch panel.

On the other hand, even when the connection between the display panel and the external set is normal, it is determined whether there is an input image and the circuit driving the display panel is stopped even when no image is input from the outside, thereby increasing the power consumption reduction effect. .

1 is an exemplary view for explaining in detail a display device including a touch panel according to the present invention.
FIG. 2A is an exemplary view for explaining a 3T1C pixel structure, which is a typical pixel structure that may have when the display panel is an organic light emitting display device.
FIG. 2B is an exemplary diagram for explaining a pixel structure in a case in which the display panel is a liquid crystal display.
3 is an exemplary diagram for explaining a self-capacitance touch panel, which is one of the capacitive touch panels.
4 is an exemplary view for explaining a driving IC controller and a driving IC provided in the timing controller.
5 is an exemplary diagram for explaining another embodiment of the driving IC control unit.

Hereinafter, a display device including a touch panel according to the present invention will be described in detail with reference to the drawings.

1 is an exemplary view for explaining in detail a display device including a touch panel according to the present invention.

A display device including a touch panel according to the present invention includes a touch and display panel 1 , a gate driver 2 , a driving IC 3 , a timing controller 4 , and an MCU 5 .

The touch and display panel 1 is a form in which a touch panel is attached to an upper portion of a display panel, and the touch panel and the display panel may be integrally formed.

The display panel includes a plurality of pixels defined in a region where the plurality of gate lines GL and data lines DL intersect and arranged in a matrix form.

When the display panel is an organic light emitting display device, each pixel includes an organic light emitting diode (OLED) including an organic light emitting layer between an anode and a cathode, and a pixel circuit independently driving the organic light emitting diode (OLED).

FIG. 2A is an exemplary view for explaining a 3T1C pixel structure, which is a typical pixel structure that may have when the display panel is an organic light emitting display device.

The pixel circuit includes at least one switching transistor TR1 and TR3 , at least one capacitor Cst, and a driving transistor TR2 . The plurality of switching transistors TR1 and TR3 charges the capacitor Cst with a data signal in response to a scan signal generated in units of every horizontal period. _{In addition, the driving transistor TR2 supplies the constant voltage V DD} according to the data voltage charged in the capacitor Cst to the organic light emitting device to drive the organic light emitting device OLED.

FIG. 2B is an exemplary view for explaining a pixel structure in a case in which the display panel is a liquid crystal display.

When the display panel is a liquid crystal display, each pixel includes a thin film transistor (TFT) and a liquid crystal capacitor Clc connected to the thin film transistor. The liquid crystal capacitor Clc includes a pixel electrode connected to the thin film transistor and a common electrode Vcom disposed with the pixel electrode and the liquid crystal interposed therebetween. The thin film transistor supplies an image signal from each data line DL to the pixel electrode in response to a scan pulse from each gate line GL.

The liquid crystal capacitor Clc charges the difference voltage between the image signal supplied to the pixel electrode and the common voltage Vcom applied to the common electrode, and adjusts the light transmittance by varying the arrangement of liquid crystal molecules according to the difference voltage to adjust the grayscale. to implement

The touch panel is located above the display panel and has a touch sensing method such as a pressure sensitive type or a capacitive type. Among them, a representative example of the capacitive touch panel will be described as follows.

3 is an exemplary diagram for explaining a self-capacitance type touch panel, which is one of the capacitive type touch panels. The upper touch panel is located above the display panel.

In the capacitive touch panel, a plurality of first electrodes 115 arranged in the x-axis direction and connected to each other through a bridge 112 and a contact hole 114 and a plurality of second electrodes arranged in the y-axis direction are one is placed on the floor of

The first electrode and the second electrode are connected to routing lines 111a and 111b for touch sensing. In this case, the routing lines 111a and 111b may be positioned on the non-display area of the display panel.

At this time, a signal for touch sensing is supplied through the first routing line 111a, and a capacitor is formed between the first electrode and the second electrode.

When a body part comes into contact with the first and second electrodes, capacitance is generated between the contacted body and the first or second electrode. The touch sensing IC senses the presence or absence of contact and the contact area in the touch sensor by supplying electric charges to the first and second electrodes and measuring a change in voltage or current accordingly.

Meanwhile, a touch panel using a mutual capacitance method may be used.

In a mutual capacitance touch panel, a lower electrode and an upper electrode are positioned on different layers with an insulating layer interposed therebetween, and a voltage is applied to the lower electrode. The touch sensing IC detects a change in mutual capacitance between the upper electrode and the lower electrode according to the contact of a contact object such as a finger to determine the touch input position.

The timing controller 4 aligns image signals input from the outside and generates various signals for driving the gate driver 2 and the driving IC 3 .

The gate driver 2 and the driving IC 3 drive a plurality of gate lines GL and data lines DL provided in the display panel 1 in response to a driving signal output from the timing controller 4 . .

In addition, the driving IC 3 converts the touch signal input from the touch panel into digital sensing data and transmits it to the MCU 5 , and the MCU 5 generates touch coordinates using the digital sensing data to generate the touch coordinates of the external set 15 ) is output.

To this end, the driving IC includes a source driver IC for driving the data lines DL, and a touch sensing IC that senses a touch signal from the touch panel, converts it into digital sensing data, and transmits it to the MCU 5 .

On the other hand, the timing controller 4 according to the present invention has a first abnormal signal DET1 or a second abnormal signal when at least one of the MCU 5 or the timing controller 4 has an abnormal connection with the external set 15 . When any one of (DET2) is received and the connection between the MCU 5 and the external set 15 is in an abnormal state, the second abnormal signal DET2 is input to generate a sensing signal for driving the touch sensing IC. In addition to stopping, driving of the touch sensing IC is stopped, and when the connection between the timing controller 4 and the external set 15 is in an abnormal state, the driving for driving the source driver IC by receiving the first abnormal signal DET1 In addition to stopping the signal generation, driving of the gate driver 2 and the source driver IC is also stopped.

To this end, the timing controller 4 includes a driving IC control unit, and the configuration of the driving IC control unit will be described with reference to the drawings below.

4 is an exemplary view for explaining the driving IC control unit 6 and the driving IC 3 provided in the timing controller 4 .

The driving IC control unit 6 generates a driving signal for driving the gate driver 2 and the source driver IC 11 , and occurs when an abnormality occurs in the connection state between the timing controller 4 and the external set 15 . A display for controlling the source driver IC 11 so that when the first abnormal signal DET1 of and a panel driving signal generator (8).

In addition, the driving IC controller 6 generates a sensing signal for driving the touch sensing IC 12 , and receives the second abnormal signal DET2 when the connection with the external set 15 of the touch panel is in an abnormal state. and a touch panel driving signal generator 9 for stopping generation of a sensing signal and controlling the touch sensing IC to stop driving of the touch sensing IC.

At this time, the MCU 5 checks the connection state between the external set 15 and the timing controller 4 and the MCU 5 , and when an abnormality occurs in the connection state, the first abnormal signal DET1 or the second abnormal signal At least one of (DET2) is output.

In this case, the first abnormal signal DET1 may be generated from an external set and input to the MCU 5 , and may be generated and output by detecting whether there is an abnormality in the MCU 5 .

Also, the first abnormal signal DET1 may be directly input to the timing controller 4 from the external set 15 .

A method of driving a display device including a touch panel according to the present invention will be described as follows.

The MCU 5 determines whether an abnormality has occurred in the connection between the timing controller 4 and the external set 15 of the MCU 5 . The MCU 5 outputs the first abnormal signal DET1 to the display panel driving signal generator 8 when an abnormality occurs in the connection between the display panel and the external set 15 , and between the touch panel and the external set 15 . When an abnormality occurs in the connection, the second abnormal signal DET2 is output to the touch panel driving signal generator 9 .

Meanwhile, the MCU 5 may receive the first abnormal signal DET1 from the external set 15 and output it to the display panel driving signal generator 8 as it is, and the first and second abnormal signals DET1, DET2) can be output simultaneously.

Also, the first abnormal signal DET1 may be directly input to the timing controller 4 from the external set 15 .

The display panel driving signal generator 8 receives the first abnormal signal DET1 and stops generating the driving signal and stops the driving of the gate driver 2 and the source driver IC 11 . The driver IC 11 is controlled. Accordingly, the driving of the source driver IC 11 is stopped, and the driving of the display panel is also stopped.

The touch panel driving signal generator 9 receives the second abnormal signal, stops generating the sensing signal, and controls the touch sensing IC 12 to stop driving the touch sensing IC 12 . Accordingly, driving of the touch sensing IC 12 is stopped, and driving of the touch panel is also stopped.

That is, the display device including the touch panel according to the present invention detects whether the connection with the external set 15 of the timing controller 4 or the MCU 5 is in an abnormal state, and drives the display panel in the abnormal state. By not driving at least one of the circuit or the circuit driving the touch panel, unnecessary power consumption is reduced.

On the other hand, even when the connection between the timing controller 4 and the external set is normal, it is determined whether there is an input image and the circuit driving the display panel is stopped even when an image is not input from the outside, thereby increasing the power consumption reduction effect. can do it

Hereinafter, a display device including a touch panel according to another exemplary embodiment of the present invention for stopping the driving of a circuit driving the display panel by detecting an image non-input state will be described below.

3 is an exemplary diagram for explaining another embodiment of the driving IC control unit 6 .

The driving IC control unit 6 includes a non-signal determination unit 10 , a selection unit 7 , a display panel driving signal generating unit 8 , and a touch panel driving signal generating unit 9 .

The non-signal determination unit 10 determines whether image data from the outside is input, and outputs a third abnormal signal DET3 when no image data is input.

The selection unit 7 receives the first selection signal S1 or the second selection signal S2 from the outside, and outputs the first abnormal signal DET1 when the first selection signal S1 is input, and the second When the selection signal S2 is input, the third abnormal signal DET3 is output to the display panel driving signal generator 8 . To this end, the selection unit 7 may include a multiplexer (MUX) or the like.

The first and second selection signals S1 and S2 may be directly input from a user.

The display panel driving signal generator 8 generates a driving signal for controlling the gate driver 2 and the source driver IC 3 when the first abnormal signal DET1 or the third abnormal signal DET3 is input. and control the gate driver 2 and the source driver IC 3 so that the gate driver 2 and the source driver IC 3 stop driving.

The touch panel driving signal generating unit 9 generates a sensing signal for driving the touch sensing IC 12 , and when the connection with the external set of the touch panel is in an abnormal state, receives the second abnormal signal to generate the sensing signal. The generation is stopped and the touch sensing IC is controlled so that driving of the touch sensing IC is stopped.

At this time, the MCU 5 checks at least one of the connection states between the external set 15 and the timing controller 4 and the MCU 5 as in the previous embodiment, and when an abnormality occurs in the connection state, the first or more At least one of the signal DET1 and the second abnormal signal DET2 is output.

In this case, the first abnormal signal DET1 may be generated from the external set 15 and input to the MCU 5 , and may be generated and output by detecting whether there is an abnormality in the MCU 5 .

Also, the first abnormal signal may be directly input to the timing controller 4 from the external set 15 .

Hereinafter, a method of driving a display device including a touch panel including the driving IC controller 6 according to the second embodiment of the present invention will be described.

The non-signal determination unit 10 determines whether image data is not input based on any one of an abnormality in a clock pulse period input from the outside, an abnormality in the frame frequency, and an abnormality in the number of vertical blank lines included in one frame. and outputting the third abnormal signal to the selection unit 7 when it is determined that the image data is not input.

The clock pulse CLK is input to have a constant frequency when image data is normally input. However, when an abnormality occurs in the input of image data, an abnormality in the frequency of the clock pulse CLK occurs. The non-signal determination unit 10 uses such a characteristic when an abnormal frequency such as the frequency of the clock pulse CLK out of a range recognizable by the timing controller 4 is input, that is, less than the first reference value. Alternatively, a case in which a frequency having a larger second reference value is input may be determined as the non-input state of the image.

The non-signal determination unit 10 determines the frame frequency through a period of a period in which the data enable signal DE is input or a vertical blank period in which the data enable signal DE is not input, and in this case, the frame frequency is constant. When the range is out of range, that is, when the frame frequency is less than the third reference value or greater than the fourth reference value, it may be determined that the image is not input.

Also, the non-signal determination unit 10 may determine whether an image is not input based on the number of vertical blank lines in one frame. When an image is normally input, the vertical blank line during each frame has a number within a predetermined range. However, when the image input is abnormal, the number of vertical blank lines exceeds a predetermined range, and the non-signal determination unit 10 determines that the number of vertical blank lines in one frame exceeds a predetermined range, that is, when the number of vertical blank lines exceeds a predetermined range, that is, the fifth reference value is higher than If it is smaller or larger than the sixth reference value, it is determined that the image is not input.

As described above, the non-signal determination unit 10 determines the non-input state of the image, and outputs the third abnormal signal DET3 to the selector 7 when the image is not input.

Meanwhile, the MCU 5 checks the connection state between the external set 15 and the timing controller 4 or MCU 3 as in the previous embodiment, and when an abnormality occurs in the connection state, the first abnormal signal DET1 or At least one of the second abnormal signals DET2 is output.

In this case, the first abnormal signal DET1 may be generated from an external set and input to the MCU 5 , and may be generated and output by detecting whether there is an abnormality in the MCU 5 .

Also, the first abnormal signal DET1 may be directly input to the timing controller 4 from the external set 15 .

At this time, when an abnormality occurs in the connection between the timing controller 4 and the external set 15 , the first abnormal signal DET1 is sent, and when an abnormality occurs in the connection between the MCU 5 and the external set 15 , the second abnormality occurs Outputting the signal DET2 is the same as in the previous embodiment.

The selection unit 7 receives the first and second selection signals S1 and S2 input by the user's selection, and after the first selection signal S1 is input, the first abnormal signal DET1 output, and after the second selection signal S2 is input, the third abnormal signal DET3 may be output.

The display panel driving signal generator 8 generates a driving signal for controlling the gate driver 2 and the source driver IC 3 when the first abnormal signal DET1 or the third abnormal signal DET3 is input. and control the gate driver 2 and the source driver IC 3 so that the gate driver 2 and the source driver IC 3 stop driving.

The display panel driving signal generator 8 receives the first abnormal signal DET1 or the third abnormal signal DET3 to stop generating the driving signal, and the gate driver 2 and the source driver IC 11 . ) controls the source driver IC 11 to stop driving. Accordingly, the driving of the source driver IC 11 is stopped, and the driving of the display panel is also stopped.

The touch panel driving signal generator 9 receives the second abnormal signal DET2, stops generating the sensing signal, and controls the touch sensing IC 12 to stop driving the touch sensing IC 12 . . Accordingly, driving of the touch sensing IC 12 is stopped, and driving of the touch panel is also stopped.

That is, the display device including the touch panel to which the driving IC controller 6 according to the second embodiment of the present invention is applied detects whether the connection with the external set of the timing controller 4 or the MCU 5 is abnormal. In addition to this, it is possible to detect whether an image is not input from the outside, and stop driving the display panel when an abnormality occurs in the connection state with the external set of the timing controller 4 or an image is not input from the outside, When an abnormality occurs in the connection state of the MCU 5 with the external set, driving of the touch panel may be stopped.

Accordingly, the display device including the touch panel to which the driving IC controller 6 according to the second embodiment of the present invention is applied can obtain an additional power consumption reduction effect compared to that of the previous embodiment.

Table 1 below shows the power consumption of the display device including the touch panel according to the present invention when the driving of the display panel is stopped, when the driving of the touch panel is stopped, and when the driving of the touch panel and the display panel is stopped will be compared

0 0 when both the touch panel and the display panel stopped driving, 1 0 when only the display panel stopped driving, 0 1 when only the touch panel stopped driving, 1 when both were driven. 1, and the power consumption for each case is as shown in Table 1.

state total power consumption power consumption change 1 1 7297.1mW - 1 0 6887.5mW -409mW 0 1 6491.1mW -806mW 0 0 6131.5mW -1165mWW

As shown in Table 1, when the driving of the touch panel and the display panel and the driving IC driving them are stopped, there is an effect of reducing power consumption by 1165 mW, about 19%, compared to the case where both the touch panel and the display panel are driven. .

On the other hand, the present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is possible to make various substitutions, modifications and changes within the scope without departing from the technical spirit of the present invention. It will be clear to those with prior knowledge in

1: Touch and display panel 2: Gate driver
3: Driver IC 4: Timing Controller
5: MCU 6: Driver IC control unit
7: selector 8: display panel driving signal generator
9: Touch panel driving signal generator 11: Source driver IC
12: touch sensing IC 15: external set
112: bridge 115: first electrode
116: second electrode 111a, 111b: routing line
114: contact hole

Claims (13)

A display panel comprising: a plurality of pixels arranged in a matrix in a region formed by crossing a plurality of gate lines and a plurality of data lines;
a touch panel positioned above the display panel;
a gate driver driving the gate line;
a driving IC including a source driver IC for driving the data line and a touch sensing IC for sensing sensing data from the touch panel;
a timing controller that aligns image data input from the outside and generates a driving signal for driving the source driver IC and the gate driver; and
Receives sensing data from the touch sensing IC, calculates touch coordinates, outputs to an external set, outputs a second abnormal signal when an abnormality occurs in connection with the external set, and connects the timing controller to the external set and an MCU for outputting a first abnormal signal input from an external set or generating and outputting the first abnormal signal when an abnormality occurs in
The timing controller is
Generates a driving signal for driving the source driver IC and a sensing signal for driving the touch sensing IC, stops generating the driving signal when the first abnormal signal is input, and when the second abnormal signal is input and a driving IC controller stopping generation of the sensing signal. The method of claim 1,
The driving IC is
a source driver IC that drives the data line and stops driving when the first abnormal signal is input; and
and a touch sensing IC that senses the sensing data and stops driving when the second abnormal signal is input. The method of claim 1,
The driving IC control unit,
a display panel driving signal generator that generates a driving signal for driving the source driver IC and stops generating the driving signal when the first abnormal signal is input; and
and a touch panel driving signal generator configured to generate a sensing signal for driving the touch sensing IC and to stop generating the sensing signal when the second abnormal signal is input. 4. The method of claim 3,
The driving IC control unit,
a non-signal determination unit for determining a non-input state of image data input from the outside, and outputting a third abnormal signal when the image data is not input; and
When a first selection signal is input from the outside, outputting the first abnormal signal, and when a second selection signal is input, further comprising a selection unit for outputting the third abnormal signal,
The source driver IC stops driving when any one of the first abnormal signal and the third abnormal signal is input. 5. The method of claim 4,
The non-signal determination unit determines that the image data is not input when a period of a clock pulse input from the outside is smaller than a preset first reference value or greater than a second reference value. 5. The method of claim 4,
The non-signal determination unit determines the frame frequency through the period of the data enable signal or the vertical blank period, and determines that the image data is not input when the frame frequency is smaller than a preset third reference value or greater than a fourth reference value Device. 5. The method of claim 4,
The non-signal determination unit detects the number of vertical blank lines in one frame and determines that image data is not input when the number of vertical blank lines is smaller than a preset fifth reference value or greater than a sixth reference value. determining an abnormality in at least one of a connection state between an external set and a timing controller or a connection state between an external set and an MCU for touch sensing;
outputting a first abnormal signal when an abnormality occurs in the connection state between the external set and the timing controller, and outputting a second abnormal signal when an abnormality occurs in the connection state between the external set and the MCU;
At least one of the first abnormal signal and the second abnormal signal is received, and when the first abnormal signal is input, generation of a driving signal for driving a gate driver and a source driver IC for driving the display panel is stopped, and the gate driver and stop driving the source driver IC,
When a second abnormal signal is input, stopping generation of a sensing signal for driving a touch sensing IC driving a touch panel, and stopping driving of the touch sensing IC. Determining an abnormality in at least one of a connection state between the external set and the timing controller, a state in which image data is not input from the outside, or a connection state between the external set and the MCU for touch sensing;
When an abnormality occurs in the connection state between the external set and the display panel, the first abnormal signal is output, and when an abnormality occurs in the connection state between the external set and the touch panel, a second abnormal signal is output, and image data is input from the outside If not, outputting a third or more signal;
At least one of the first abnormal signal to the third abnormal signal is received, and when the first and third abnormal signals are input, generation of driving signals for driving the gate driver and the source driver IC for driving the display panel is stopped; , stop driving the gate driver and source driver IC,
When a second abnormal signal is input, stopping generation of a sensing signal for driving a touch sensing IC driving a touch panel, and stopping driving of the touch sensing IC. 10. The method of claim 9,
Stopping the driving of the gate driver and the source driver IC by the input of the first and third abnormal signals comprises:
The method of claim 1, further comprising: receiving a first abnormal signal after the first selection signal is input and receiving a third abnormal signal after the second selection signal is input. 10. The method of claim 9,
The step of detecting a state in which the image data is not input includes:
A method of driving a display device for determining that image data is not input when a period of a clock pulse input from the outside is smaller than a preset first reference value or greater than a second reference value. 10. The method of claim 9,
The step of detecting a state in which the image data is not input includes:
A method of driving a display device in which a frame frequency is determined through a period of a data enable signal or a vertical blank period, and image data is not input when the frame frequency is less than a preset third reference value or greater than a fourth reference value. 10. The method of claim 9,
The step of detecting a state in which the image data is not input includes:
A method of driving a display device for detecting the number of vertical blank lines in one frame and determining that image data is not input when the number of vertical blank lines is smaller than a preset fifth reference value or greater than a sixth reference value.

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