KR102294357B1 - Liquid crystal display device and method of driving the same - Google Patents

Abstract

The present invention relates to a display device, and more particularly, to a display device that is formed on an upper substrate of a panel including a touch panel and uses a transparent electrode used for stain prevention to determine whether a touch is present in an idle mode, and It is a technical task to provide a driving method thereof.

Description

Liquid crystal display device and its driving method

The present invention relates to a liquid crystal display device, and more particularly, to a display device including a touch panel.

Flat panel displays (FPDs) are used in various types of electronic products, including mobile phones, tablet PCs, and notebook computers. Flat panel displays include a liquid crystal display (LCD), a plasma display (PDP), an organic light emitting display device (OLED), and more recently, an electrophoretic display (EPD: ELECTROPHORETIC). DISPLAY) is also widely used.

Among flat panel displays (hereinafter simply referred to as 'display devices'), liquid crystal displays (LCDs) and organic light emitting displays (OLEDs) are widely used.

1 is a flowchart illustrating a method in which a conventional display device performs a touch function.

In a conventional display device including a touch panel, in an active mode, the presence or absence of a touch is sensed using the touch panel (S10).

The display device determines whether to enter an idle mode from the active mode (S20).

If no touch is detected for a preset period, the display device drives the touch panel in the idle mode (S30).

In the idle mode, the display device executes only a minimum function among touch sensing functions, and thus power consumption of the display device may be reduced. For example, in the active mode, the presence or absence of a touch is sensed by using four analog-to-digital converters (ADCs) in the touch sensing unit for detecting the presence or absence of a touch. However, in the idle mode, the presence or absence of a touch is detected using only one analog-to-digital converter (ADC). Accordingly, the touch sensing speed may be reduced, but power consumption may be reduced.

The display device determines whether a touch is detected in the idle mode (S40). As a result of the determination, when a touch is detected, the display device determines whether the touch panel is touched again in the active mode (S10).

As described above, in the idle mode, the presence or absence of a touch is determined by performing only a minimum function. However, even in the idle mode, in order to accurately determine the presence or absence of a touch, the presence or absence of a touch must be determined for the entire area of the touch panel. Accordingly, when the number of touch electrodes or touch channels disposed on the touch panel is large, a large amount of power consumption must be used.

In other words, in the idle mode, when the presence or absence of a touch is determined only in a partial area of the touch panel, when the touch is made in the remaining areas in which the presence or absence of a touch is not determined, the active mode cannot be normally switched. Therefore, the presence or absence of a touch on the entire area of the touch panel should be determined. Accordingly, even in the idle mode, a lot of power consumption must be used.

Like a liquid crystal panel constituting a liquid crystal display device or an organic light emitting panel constituting an organic light emitting display device, an upper substrate of a panel applied to a display device has a transparent electrode plate (hereinafter, Simply referred to as a 'back transparent electrode') is formed. In this case, the rear transparent electrode is formed on the entire surface of the upper substrate of the panel in order to prevent staining due to static electricity.

In order to form the rear transparent electrode on the entire surface of the upper substrate, cost and process should be added. However, the rear transparent electrode formed on the entire surface of the upper substrate is used only for preventing stains due to static electricity. The rear transparent electrode may also be formed on an upper substrate of a panel applied to a display device including a touch panel.

In other words, in a conventional display device including a touch panel, even in the idle mode, a large amount of power is consumed to determine whether the entire touch panel is touched. Although the power consumption in the idle mode is smaller than the power consumption in the active mode, a large amount of power consumption is fixedly consumed even in the idle mode.

In addition, in a conventional display device including a touch panel, the transparent rear electrode formed at a high cost is used only for the purpose of preventing stains due to static electricity.

The present invention is to solve the above-described problems, and a transparent electrode formed on an upper substrate of a panel including a touch panel and used for stain prevention can be used for determining whether a touch is present in an idle mode, a display device And it is a technical task to provide a driving method thereof.

A display device according to the present invention for achieving the above object is manufactured by bonding an upper substrate and a lower substrate, the panel having a rear transparent electrode disposed on the rear surface of the upper substrate; a touch panel including touch electrodes; a panel driver for driving the panel so that an image is output through the panel; And in the active mode, the touch on the panel is determined using the detection signals received from the touch electrodes, and in the idle mode, the touch is determined on the panel using the detection signals received from the rear transparent electrode. It includes a sensing unit.

According to an aspect of the present invention, there is provided a method of driving a display device in an active mode, comprising: sensing a touch using sensing signals received from touch electrodes provided on a touch panel; in the active mode, when a touch is not detected for a preset period, determining whether a touch is present using a detection signal received from a rear transparent electrode provided on the rear surface of the upper substrate of the panel; and detecting the presence or absence of a touch in the active mode when a touch is sensed in an idle mode for determining the presence or absence of a touch by using the sensing signal received from the rear transparent electrode.

According to the present invention, the transparent back electrode formed on the panel and used for stain prevention can be used for determining whether or not a touch is present.

Accordingly, when the display device on which the touch panel is mounted is driven in the idle mode, determination of whether a touch exists for switching to the active mode may be performed using the rear transparent electrode. Accordingly, power consumption in the idle mode may be reduced.

1 is a flowchart illustrating a method of performing a touch function in a conventional display device.
2 is an exemplary view showing the configuration of a display device according to the present invention.
3 is an exemplary diagram schematically illustrating a structure of a panel applied to a display device according to the present invention;
4 is an exemplary diagram schematically illustrating the configuration of a display device according to the present invention.
5 is a flowchart illustrating a method of driving a display device according to an embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exemplary view showing the configuration of a display device according to the present invention. 3 is an exemplary diagram schematically illustrating a structure of a panel applied to a display device according to the present invention.

As shown in FIG. 2, the display device according to the present invention is manufactured by bonding an upper substrate and a lower substrate, and a rear transparent electrode 700 is provided on the rear surface of the upper substrate panel 100, touch The touch panel 500 including electrodes, the panel drivers 200 , 300 , 400 for driving the panel so that an image is output through the panel 100 , and the sensing signal received from the touch electrodes in the active mode A touch sensing unit that determines a touch on the panel 100 using the (600).

First, the panel 100 is formed by bonding an upper substrate and a lower substrate.

The rear transparent electrode 700 is provided on the rear surface of the upper substrate.

The display device according to the present invention may be a liquid crystal display device, an organic light emitting display device, a plasma display device, or an electrophoretic display device.

In the case of a liquid crystal display device, an upper substrate and a lower substrate are provided, the organic light emitting display device is also provided with an upper substrate and a lower substrate, and the electrophoretic display device is also provided with an upper substrate and a lower substrate. In this case, the rear transparent electrode 700 may be provided on the upper substrate regardless of the type of display device.

In addition, the touch panel 500 is formed in an in-cell type and may be provided inside the panel 100 , and the touch panel 500 is formed as an add-on type and is attached to the panel 100 . Also, the touch panel 500 may be formed in various other forms and provided on the panel 100 . In this case, regardless of the type of display device, the touch panel 500 may be provided on the panel 500 .

Accordingly, the present invention can be applied to all types of currently used display devices.

However, hereinafter, for convenience of description, a liquid crystal display device will be described as an example of the display device according to the present invention. Accordingly, the panel 100 becomes a liquid crystal panel.

When the panel 100 is a liquid crystal panel, as shown in FIG. 3 , a liquid crystal 130 is filled between the upper substrate 110 and the lower substrate 120 .

The panel 100 may be formed using a twisted nematic (TN) mode or an in plane switching (IPS) mode.

The lower substrate 120 constituting the panel 100 using the IPS mode includes a lower base substrate 122 and a driving layer 123 . In the driving layer 123 , a plurality of data lines DL1 to DLd, a plurality of gate lines GL1 to GLg crossing the data lines, and regions where the data lines and the gate lines intersect are formed in the driving layer 123 . Thin Film Transistors (TFTs) formed in pixels formed in Common electrodes for driving the liquid crystal are formed.

For example, in the panel 100 using the IPS mode, the common electrode and the pixel electrode are formed on the lower substrate.

As the common electrode, a transparent electrode such as indium tin oxide (ITO) may be used.

A lower polarizing film 121 may be attached to a lower surface of the lower base substrate 122 .

Since the structure, function, and manufacturing method of the lower substrate 120 are the same as those of the lower substrate currently applied to a general liquid crystal display device, a detailed description thereof will be omitted.

The upper substrate 110 constituting the panel 100 using the IPS mode includes an upper base substrate 116 and a color filter layer 115 . A black matrix (BM), a color filter, the transparent electrode, and an alignment layer are formed on the color filter layer 115 .

In this case, the rear transparent electrode 700 is formed on the rear surface of the upper base substrate 116 . Here, the rear surface means a surface on which the color filter layer 115 is not formed, among both surfaces of the upper base substrate 116 .

An upper polarizing film 118 may be attached to the upper surface of the rear transparent electrode 700 .

Since the structure, function, and manufacturing method of the upper substrate 110 are the same as those of the upper substrate currently applied to a general liquid crystal display device, a detailed description thereof will be omitted.

In addition, in the above, the panel using the IPS mode has been described as an example of the panel 100 applied to the present invention. However, the panel 100 applied to the present invention may be a panel using the TN mode. Even in the panel using the TN mode, the rear transparent electrode 700 may be formed on the rear surface of the upper substrate 110 .

The panel 100 is driven by control signals transmitted from the panel driver to output an image.

Second, the rear transparent electrode 700 is formed on the rear surface of the upper substrate 110 , and in particular, is formed on the entire surface of the upper substrate 110 .

The rear transparent electrode 700 is used to prevent stains due to static electricity in the active mode, and is used to sense a touch in the idle mode.

As the rear transparent electrode 700 , a transparent electrode such as indium tin oxide (ITO) may be used.

Third, as described above, the touch panel 500 may be disposed inside the panel 100 or may be attached to the panel 100 . 3 shows an in-cell type panel 100 in which the touch panel 500 is disposed inside the panel 100 .

The touch panel 500 may be configured in a mutual method or a self-cap method.

The touch panel 500 using the mutual method includes driving electrodes to which a touch driving signal is sequentially supplied and receiving electrodes for transmitting a sensing signal generated by the touch driving signal to the touch sensing unit 600 . do. The driving electrodes and the receiving electrodes are formed on the touch panel 500 to vertically cross each other. The driving electrodes and the receiving electrodes are collectively referred to as the touch electrode.

The touch electrodes applied to the touch panel 500 using the self-cap method are formed in a block shape, and each touch electrode is individually connected to the touch sensing unit 600 .

Fourth, in the active mode, the touch sensing unit 600 determines a touch on the panel 100 by using the sensing signals received from the touch electrodes constituting the touch panel 500 , In the idle mode, the presence or absence of a touch in the panel 100 is determined using the sensing signal received from the rear transparent electrode 700 .

For example, in the active mode, the touch sensing unit 600 supplies a touch driving signal to the touch panel 500 and analyzes the sensing signal received from the touch panel 500 by the touch driving signal. Thus, it is determined whether a user's finger or the like has been touched on the touch panel 500 . The result of determining the presence or absence of the touch may be transmitted to an external system (not shown) through the panel driving unit or may be directly transmitted to the external system.

In this case, the touch driving signal may be a current or a voltage depending on the type of the touch panel 500 .

In addition, in the idle mode, the touch sensing unit 600 supplies a touch driving signal to the rear transparent electrode 700 and analyzes the sensing signal received from the rear transparent electrode 700 by the touch driving signal. Thus, it is determined whether the user's finger or the like has touched the rear transparent electrode 700 . The determination result of the presence or absence of the touch may be transmitted to the external system through the panel driver or may be directly transmitted to the external system.

For example, when a touch driving signal for touch detection is supplied to the rear transparent electrode 700 , when a user touches the panel 100 with a finger or the like, the electrostatic charge charged to the rear transparent electrode 700 . The capacity or the time for which the preset capacitance is charged varies. The touch sensing unit 600 detects the change amount and determines whether the rear transparent electrode 700 is touched.

The external system means a system for driving an electronic product to which the display device according to the present invention is applied, for example, a monitor, TV, smart phone, tablet PC, and the like.

Upon receiving the determination result from the touch sensing unit 600 , the external system may perform various functions of the electronic product according to the determination result.

In order to perform the function as described above, the touch sensing unit 600, in the active mode, an active touch sensor 610 that receives a sensing signal from the touch electrodes constituting the touch panel 500 . , using the detection signal received from the idle touch sensor 620, the active touch sensor 610, or the idle touch sensor 620 that receives a detection signal from the rear transparent electrode 700 in the idle mode Switching to drive the active touch sensor 610 or the idle touch sensor 620 according to the touch determiner 640 that determines whether there is a touch and a mode control signal transmitted from the touch determiner 640 group 630 .

The active touch sensor 610 has the same structure and function as that of a touch sensor generally configured in a display device for touch sensing.

For example, in the active mode, the active touch sensor 610 supplies a touch driving signal to the touch electrodes constituting the touch panel 500 and receives a sensing signal from the touch electrodes. , and transmits the received detection signal to the touch determiner 640 .

The idle touch sensor 620, in the idle mode, supplies a touch driving signal to the rear transparent electrode, receives a detection signal from the rear transparent electrode 700, and transmits the received detection signal to the touch determiner. (640).

The touch determiner 640 uses the sensing signal received from the active touch sensor 610 or the idle touch sensor 620 to perform the touch panel 500 or the rear transparent electrode 700 . to determine whether or not to touch That is, the touch determiner 640 may determine whether a touch is actually present by using the raw data received from the active touch sensor 610 or the idle touch sensor 620 . Also, the touch determiner 640 may determine the touch position.

The determination result, particularly, the determination result in the active mode may be transmitted to the external system through the panel driver or may be directly transmitted to the external system.

The active touch sensor 610 , the idle touch sensor 620 , and the touch determiner 620 may be mounted on the display device independently of the panel driver, or may be integrally formed with the panel driver. have. In particular, when the panel driver includes a controller, a gate driver, and a data driver, the active touch sensor 610 , the idle touch sensor 620 , and the touch determiner 620 may be included in the data driver. can

In addition, the active touch sensor 610 and the idle touch sensor 620 may be provided in the data driver, and the touch determiner 620 may be provided in the controller.

In addition, the active touch sensor 610 and the idle touch sensor 620 may be provided in the data driver, and the touch determiner 620 may be independently provided in the display device.

The switcher 630 drives the active touch sensor 610 or the idle touch sensor 620 according to a mode control signal transmitted from the touch determiner 640 .

For example, when an active mode control signal is received from the touch determiner 640 , the switcher 630 connects the touch determiner 640 with the active touch sensor 610 . Accordingly, in the active mode, the presence or absence of a touch in the touch panel 500 is determined.

Also, when an idle mode control signal is received from the touch determiner 640 , the switcher 630 connects the touch determiner 640 with the idle touch sensor 620 . Accordingly, in the idle mode, the presence or absence of a touch in the rear transparent electrode 700 is determined.

The active mode control signal or the idle mode control signal may be directly generated by the touch determiner 640 or transmitted from the control unit constituting the panel driver.

For example, the touch determiner 640 constituting the touch sensing unit 600 generates the idle mode control signal to generate the idle mode control signal when, in the active mode, no touch is detected for a preset period of time, the switch 630 ) is sent to In this case, the touch determiner 640 determines whether there is a touch in the idle mode.

When a touch is detected in the idle mode, the touch determiner 640 generates the active mode control signal and transmits it to the switcher 630 . In this case, the touch determiner 640 determines whether there is a touch in the active mode.

In addition, the panel driving unit, particularly, the control unit generating various control signals, analyzes information transmitted from the touch sensing unit 600, and in the active mode, if no touch is detected for a preset period, the idle mode transmits the idle mode control signal to the touch determiner 640 of the touch sensing unit 600 to determine whether there is a touch. In this case, the touch determiner 640 determines whether there is a touch in the idle mode.

In addition, when a touch is sensed in the idle mode, the panel driver transmits the active mode control signal to the touch determiner 640 of the touch sensing unit 600 to determine whether a touch exists in the active mode. In this case, the touch determiner 640 determines whether there is a touch in the active mode.

Fifth, as shown in FIG. 2 , the panel driver 200 , 300 , 400 is a data driver for supplying a data voltage to the data lines DL1 to DLd formed on the panel 100 . 300), the gate driver 200 and the data driver 300 for sequentially supplying the gate pulses to the gate lines GL1 to GLg formed on the panel 100 while the data voltage is output. and a control unit 400 for controlling the gate driver 200 .

First, the controller 400 receives timing signals such as a data enable signal and a dot clock CLK from the external system, and operates timing of the data driver 300 and the gate driver 200 . Control signals (GCS, DCS) for controlling the The controller 400 may generate a touch synchronization signal for controlling the touch sensing unit 600 and may also generate the mode control signal.

Also, the control unit 400 rearranges the input image data input from the external system and outputs the rearranged image data to the data driver 300 .

Next, the data driver 300 converts the image data input from the controller 400 into the data voltage, and generates a data voltage corresponding to one horizontal line for each horizontal period in which a gate pulse is supplied to the gate line. to the data lines. For example, the data driver 300 converts the image data into a data voltage using gamma voltages supplied from a gamma voltage generator (not shown), and outputs the image data to the data lines.

Finally, the gate driver 200 shifts the gate start pulse transmitted from the controller 400 according to a gate shift clock, and sequentially connects the gate lines GL1 to GLg. ) is supplied with the gate pulse.

In the above description, the data driver 300 , the gate driver 200 , and the control unit 400 have been described as being independently configured, but at least one of the data driver 300 or the gate drivers 200 is It may be configured in the control unit 400 .

4 is an exemplary diagram schematically illustrating the configuration of a display device according to the present invention. In the following description, the same or similar contents to those described above are omitted or simply described.

As described above, the display device according to the present invention includes the panel 100 , the touch panel 500 , the rear transparent electrode 700 , the panel drivers 200 , 300 , 400 , and the touch sensing. part 600 .

The panel 100 , the panel drivers 200 , 300 , 400 , and the rear transparent electrode 700 have the same configuration as the panel, the panel driver, and the rear transparent electrode provided in the conventional display device.

The touch panel 500 may be the in-cell type touch panel, the add-on type touch panel, or various other types of touch panel.

In addition, the touch panel 500 may be configured in the mutual method or may be configured in the self-cap method. In particular, FIG. 4 shows the touch panel 500 configured in the mutual manner.

The touch panel 500 using the mutual method receives, as shown in FIG. 4 , the driving electrodes TX to which the touch driving signal is supplied and the sensing signal to the touch sensing unit 600 . electrodes RX. The driving electrodes TX and the receiving electrodes RX are collectively referred to as a touch electrode.

As described above, the touch sensing unit 600 includes the active touch sensor 610 , the idle touch sensor 620 , the touch determiner 640 , and the switcher 630 .

When the touch panel 500 is configured in the mutual manner, the active touch sensor 610 includes a touch driver 610a sequentially supplying the touch driving signal to the driving electrodes TX and the sensing signal. It includes a touch receiver 610b for receiving.

As described above, the rear transparent electrode 700 is formed of a single sheet, that is, a metal plate. In this case, the rear transparent electrode 700 may be driven by a self-cap method. Accordingly, the idle touch sensor 620 may include components used to sense a touch in a self-cap method.

In the present invention as described above, in the active mode, the touch panel 500 is used to determine whether there is a touch, and in the idle mode, the rear transparent electrode 700 is sensed instead of the touch panel 500 . , to determine whether there is a touch or not.

To this end, the touch sensing unit 600 includes the switch 630 .

In the active mode, the touch panel 500 performs a general touch sensing function, and the rear transparent electrode 700 performs only an antistatic function.

In the idle mode, the touch panel 500 does not perform a touch sensing function, and the rear transparent electrode 700 performs a touch sensing function.

The rear transparent electrode 700 is composed of one sheet, that is, one electrode plate. Accordingly, in the idle mode, the presence or absence of a touch may be determined by driving only one channel. Accordingly, power consumption may be reduced.

For example, in the idle mode, the touch position does not need to be determined, and only the presence or absence of a touch is important. Accordingly, the rear transparent electrode 700 may be used, and accordingly, power consumption in the idle mode may be reduced.

5 is a flowchart illustrating a method of driving a display device according to an embodiment of the present invention. In the following description, the same or similar contents to those described above are omitted or simply described.

First, in the active mode, the touch sensing unit 600 senses a touch using sensing signals received from the touch electrodes provided on the touch panel 500 ( S502 ).

In this case, the active touch sensor 610 of the touch sensing unit 600 transmits the touch driving signal to the touch panel 500 and receives the sensing signal from the touch panel 500 .

Next, the touch sensing unit 600 or the control unit 400 determines whether a touch is detected for a preset period ( S504 ). That is, the touch sensing unit 600 or the control unit 400 determines whether to change the active mode to the idle mode.

Next, in the active mode, if no touch is detected for a preset period, the touch sensing unit 600, in the idle mode, the rear transparent electrode 700 provided on the rear surface of the upper substrate of the panel 500 ), it is determined whether there is a touch by using the sensing signal received from (S506).

In this case, the idle touch sensor 620 of the touch sensing unit 600 transmits the touch driving signal to the rear transparent electrode 700 , and receives the sensing signal from the rear transparent electrode 700 . .

Finally, in the idle mode for determining the presence or absence of a touch using the sensing signal received from the rear transparent electrode 700, when a touch is detected (S508), the touch sensing unit 600 detects a touch in the active mode. Detect (S508).

According to the present invention as described above, power consumption can be saved as compared with the prior art.

In fact, as a result of measuring power consumption while changing the driving number of touch electrodes provided in the touch panel, in particular, 26 driving electrodes TX, power consumption when one driving electrode is driven is, 62.5% less than the power consumption when the electrode is driven.

In addition, when the five driving electrodes TX are driven, compared to the case where all 26 driving electrodes are driven, power consumption is reduced by 55.9%, and when the 10 driving electrodes TX are driven, Power consumption is reduced by 49.3%, and when 15 driving electrodes TX are driven, power consumption is reduced by 43.1%, and when 20 driving electrodes TX are driven, power consumption of 37.7% is reduced. is reduced

Accordingly, according to the present invention, in which the presence or absence of a touch is determined using the rear transparent electrode 700 without using the touch panel 500 when entering the idle mode, the touch panel 500 is used to Power consumption less than that of a conventional display device in which presence or absence is determined may be consumed.

The features of the present invention described above are summarized as follows.

In order to drive the touch panel with low power, conventionally, an active mode and an idle mode exist.

For example, in the active mode, the touch panel is normally driven to determine whether there is a touch.

However, in the active mode, if a touch is not detected through the touch panel for a preset period, an idle mode in which a period for receiving a detection signal from the touch panel is minimized is executed.

When a touch is sensed again through the touch panel in the idle mode, the active mode is executed again.

In this case, the power consumption in the idle mode is smaller than the power consumption in the active mode. However, in order to determine the presence or absence of a touch in all areas of the touch panel even in the idle mode, all areas of the touch panel must be sensed. Accordingly, there is a limit to minimizing power consumption in the idle mode.

To solve this, in the present invention, the presence or absence of a touch is determined using the rear transparent electrode 700 in the idle mode, and when a touch is detected in the idle mode, the active mode is switched to. In the active mode, the presence or absence of a touch is determined using the touch panel 500 .

For example, in the present invention, in the idle mode, instead of the touch panel 500, a touch is sensed using the rear transparent electrode 700, and when a touch is sensed through the rear transparent electrode 700, Again, in the active mode, a touch is sensed using the touch panel 500 .

Since the rear transparent electrode 700 is formed of one sheet, when a touch is sensed using the rear transparent electrode 700, only one channel is driven. In contrast, when a touch is sensed using the touch panel 500 , all of a plurality of channels constituting the touch panel must be driven.

Therefore, even in the idle mode, compared to the conventional display device in which touch is determined using the touch panel 500 , in the idle mode, the present in which touch is determined using the rear transparent electrode 700 . Power consumption in the display device according to the invention can be reduced.

Those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: panel 200: gate driver
300: data driver 400: control unit
700: rear transparent electrode 600: touch sensing unit
500: touch panel

Claims (5)

a panel manufactured by bonding an upper substrate and a lower substrate, the panel having a rear transparent electrode disposed on a rear surface of the upper substrate;
a touch panel including touch electrodes;
a panel driver for driving the panel so that an image is output through the panel; and
In the active mode, touch sensing on the panel is determined using the sensing signals received from the touch electrodes, and in the idle mode, touch sensing determines whether or not there is a touch in the panel using the sensing signal received from the rear transparent electrode. including wealth,
The rear transparent electrode is provided to prevent staining due to static electricity,
The display device in which the rear transparent electrode is formed as a single electrode plate on the entire surface of the upper substrate. The method of claim 1,
The touch sensing unit,
The display device determines whether a touch is present in the idle mode when no touch is detected for a preset period, and determines a touch in the active mode when a touch is detected in the idle mode. The method of claim 1,
The panel driver,
By analyzing the information transmitted from the touch sensing unit, if a touch is not detected for a preset period, the touch sensing unit is controlled to determine whether a touch exists in the idle mode, and when a touch is detected in the idle mode, the touch is performed in the active mode A display device that controls the touch sensing unit to determine the presence or absence of the touch sensor. The method of claim 1,
The touch sensing unit,
an active touch sensor configured to receive sensing signals from the touch electrodes in the active mode;
an idle touch sensor for receiving a sensing signal from the rear transparent electrode in the idle mode;
a touch determiner that determines whether there is a touch using the sensing signal received from the active touch sensor or the idle touch sensor; and
and a switch configured to drive the active touch sensor or the idle touch sensor according to a mode control signal transmitted from the touch determiner. in the active mode, sensing a touch using sensing signals received from touch electrodes provided on the touch panel;
in the active mode, when a touch is not detected for a preset period, determining whether a touch is present using a detection signal received from a transparent rear electrode provided on the rear surface of the upper substrate of the panel; and
In the idle mode for determining the presence or absence of a touch using the sensing signal received from the rear transparent electrode, when a touch is detected, detecting the presence or absence of a touch in the active mode;
The rear transparent electrode is provided to prevent staining due to static electricity,
and the rear transparent electrode is formed as a single electrode plate on the entire surface of the upper substrate.

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