KR20210080981A - Display device implementing sleep mode - Google Patents

Abstract

One embodiment of the present invention relates to a technology for controlling power of a display device in a sleep mode, which supplies sub power for a touch sensing operation instead of a main power for a display operation in the sleep mode, and thus overall power consumption of the display device can be reduced. The display device includes: a display circuit operable to output image data through pixels; a touch circuit operable to sense a touch or proximity of an external object through a touch electrode; a first power circuit which receives a main voltage through a first power line, and in which a first touch circuit or a second touch circuit which operates based on the main voltage is integrated with a display circuit, and supplies power based on the main voltage to a coupling circuit operating based on the main voltage; and a second power circuit for receiving a sub voltage through a second power line and supplying power based on the sub voltage to a third touch circuit.

Description

A display device that implements a sleep mode {DISPLAY DEVICE IMPLEMENTING SLEEP MODE}

This embodiment relates to a technology for controlling power to implement a sleep-mode of a display device.

One of the most important issues in electronic devices including mobile devices is the minimization of power consumption. As battery capacity is limited and electronic devices become smaller, power consumption needs to be continuously lowered. Therefore, research on power consumption reduction is being conducted more actively. The display mounted on almost all electronic devices will have ample room for power consumption to be reduced.

Meanwhile, the screen of the electronic device may be an area in which an image is displayed as well as an area in which input is received. In order for the screen of the electronic device to receive an input, a touch sensing technology for recognizing a touch or proximity of an external object is used.

In order for a display device such as an electronic device to perform touch sensing with a display, the touch panel and a part of the display panel may have an in-cell or on-cell type panel in which they are shared. When the panel is an in-cell or on-cell type, the display device may display in one section through time division and sense a touch or proximity of an external object in another section.

In order to reduce power consumption of the display device, it is necessary to differentially supply power according to whether the display device performs display or touch sensing. When the display device performs a display operation, power for touch sensing is hardly required, and when the display device performs a touch sensing operation, power for display is hardly required. If power for touch sensing is supplied until the display device performs a display operation, power will be wasted. Conversely, if power for the display is supplied until the display device performs a touch sensing operation, power will be wasted as well.

In addition, in a situation where power for display and power for touch sensing are separately supplied and the touch sensing related circuit is driven with power for display, as above, if only power for touch sensing is supplied, the touch sensing related circuit is properly may not work. A touch sensing circuit that operates based on power for a display needs to be stably supplied with power regardless of the time division section—the display section and the touch section.

In this regard, according to the present embodiment, power consumption of the entire display device can be reduced by controlling power according to a display operation and a touch sensing operation. At the same time, the present embodiment intends to provide a technology for receiving stable power even in a situation in which a touch sensing circuit operating based on power for a display has to rely solely on power for touch sensing.

Against this background, an object of the present embodiment is to provide a technology for supplying power for a touch sensing operation to a touch circuit driven by main power and a combination circuit including the one touch circuit in a sleep mode.

Another object of the present embodiment is to provide a technology for selecting power for a touch sensing operation through a switch in a sleep mode and supplying the selected power to a touch circuit driven by main power and a combination circuit including the one touch circuit will do

Another object of the present embodiment is to provide a technology for blocking current leakage due to power for a touch sensing operation in a sleep mode.

In order to achieve the above object, an embodiment includes a display circuit operable to output image data through a pixel; a touch circuit operable to sense a touch or proximity of an external object through a touch electrode; In a first touch circuit that receives a main voltage through a first power line and operates based on the main voltage or a second touch circuit is integrated with one display circuit and operates based on the main voltage, a first power circuit for supplying power based on the main voltage; and a second power circuit for receiving a sub voltage through a second power line and supplying power based on the sub voltage to a third touch circuit, wherein the second power circuit receives an auxiliary sub voltage from the sub voltage. and supplying the auxiliary sub-voltage to the coupling circuit to supply power to the second touch circuit.

In the display device, the second power circuit may supply power to the second touch circuit by generating the auxiliary sub voltage in a sleep mode in which the supply of the first power circuit of the main voltage is cut off. have.

In the display device, further comprising a first switch connected between the second power circuit and the coupling circuit or between the second power circuit and the first touch circuit, wherein the first switch, the main voltage Transmission of the auxiliary sub-voltage may be controlled in a normal mode supplied to the first power circuit and in the sleep mode.

In the display device, the one display circuit may include a source driver circuit for outputting a data voltage corresponding to the image data.

In the display device, the first touch circuit includes a touch modulation circuit for generating a driving voltage for driving the touch electrode, and the second touch circuit is configured to generate touch data representing the touch or proximity. It may include a readout circuit for

In the display device, the first switch may include a diode.

In the display device, the display device further includes a second switch connected between the first switch and the first power circuit, wherein the second switch is configured to prevent leakage of current due to the auxiliary sub-voltage to the first power circuit. can be blocked

In the display device, the coupling circuit may include a source read-out circuit.

Another embodiment provides a display circuit operable to output image data through pixels; a touch circuit operable to sense a touch or proximity of an external object through a touch electrode; a switching unit connected to a first power line to which a main voltage is supplied and a second power line to which a sub voltage is supplied; and a first touch circuit or a second touch circuit that is connected to the switching unit and operates based on the main voltage is integrated with a display circuit, and a combined circuit that operates based on the main voltage, the power based on the main voltage and a power supply circuit for supplying , wherein the switching unit selects any one of the main voltage and the sub voltage and transmits it to the power circuit, and the power circuit receives the main voltage, power based on the main voltage to the second touch circuit, and when receiving the sub-voltage, provides a display device that supplies power based on the sub-voltage to the second touch circuit.

In the display device, the switching unit includes a first switch for controlling a current of the main voltage and a second switch for controlling a current of the sub voltage, and a current through opening and closing of the first switch and the second switch can control

In the display device, the first switch and the second switch may include a diode or a transistor.

In the display device, a pull-up switch connected between the first power-in and the second power line, the pull-up switch stabilizing the opening of the second switch in a display mode in which the supply of the sub-voltage is cut off and the main voltage is supplied (pull-up switch) may be further included.

In the display device, the switching unit may select the sub-voltage in a sleep mode in which the supply of the main voltage is cut off, and the power circuit may supply power based on the sub-voltage to the second touch circuit in the sleep mode. can

In the display device, the switching unit selects the main voltage in a display mode in which the main voltage is supplied and in a normal mode in which both the main voltage and the sub voltage are supplied, and the power circuit includes the display mode and the normal mode. In the mode, power based on the main voltage may be supplied to the second touch circuit.

The display device may include a microcontroller that receives a mode signal indicating whether the main voltage is supplied and controls the power circuit according to the mode signal.

In the display device, the switching unit may select the sub-voltage when the mode signal indicates a sleep mode, and the power circuit may receive the sub-voltage and supply power based on the sub-voltage to the second touch circuit. have.

In the display device, the power supply circuit supplies power to the display circuit other than the one display circuit, and the microcontroller controls the power supply circuit to stop supplying power to the other display circuit in the sleep mode. can

In the display device, the one display circuit may include a source driver circuit for outputting a data voltage corresponding to the image data.

In the display device, the first touch circuit includes a touch modulation circuit for generating a driving voltage for driving the touch electrode, and the second touch circuit is configured to generate touch data representing the touch or proximity. It may include a readout circuit for

As described above, according to the present embodiment, by supplying sub-power for the touch sensing operation instead of the main power for the display operation in the sleep mode, the total power consumption of the display device can be reduced.

And, according to the present embodiment, in the sleep mode, power can be stably supplied to one touch circuit driven by main power and a coupling circuit including the one touch circuit.

1 is a block diagram of a display device.
2 is a block diagram of a display device showing a subdivided power management circuit.
3 is a first configuration diagram of a display device including a switch to supply sub-power in a sleep mode according to an exemplary embodiment.
4 is a second configuration diagram of a display device including a plurality of switches to supply sub-power in a sleep mode according to an exemplary embodiment.
5 is a block diagram of a display device including a switch unit to supply sub-power in a sleep mode according to another exemplary embodiment.
6 is a partial configuration diagram of a display device showing sleep mode detection of a microcontroller according to another exemplary embodiment.
7 is a diagram illustrating a mode signal generator generating a sleep mode signal according to another exemplary embodiment.
8 is a block diagram of a display device including a pull-up switch for cutting off sub-power in a display mode according to another exemplary embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the components from other components, and the essence, order, or order of the components are not limited by the terms. When a component is described as being “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It should be understood that elements may be “connected,” “coupled,” or “connected.”

1 is a block diagram of a display device.

Referring to FIG. 1 , the display device 10 includes a panel 11 , a source readout circuit 120 (SRIC: source readout IC), a gate driving circuit 13 ( GDIC: gate driving IC), and a touch modulation circuit 14 . , TMIC: touch modulation IC), timing controller (15, TCON: timing controller) microcontroller (16, MCU: micro controller) and power management circuit (17, PMIC: power management IC).

A plurality of data lines DL and a plurality of gate lines GL are disposed on the panel 11 , and a plurality of pixels may be disposed. A pixel may be composed of a plurality of sub-pixels (SP). Here, the sub-pixel may be R (red), G (green), B (blue), W (white), or the like. One pixel may be composed of RGB sub-pixels SP, RGBG sub-pixels SP, or RGBW sub-pixels SP. Hereinafter, for convenience of description, it will be described that one pixel is composed of RGB sub-pixels SP.

The source readout circuit 12 , the gate driving circuit 13 , and the timing controller 15 are devices that generate signals for displaying an image on the panel 11 .

The source read-out circuit 12 may include a source driver IC (SDIC) therein. The source driver circuit may supply the data voltage to the sub-pixel SP through the data line DL. The data voltage supplied to the data line DL may be supplied to the sub-pixel SP according to the gate driving signal.

In addition, the source readout circuit 12 may include a readout circuit (ROIC: readout IC) therein. The read-out circuit may be built into the source read-out circuit 12 together with the source driver circuit. The read-out circuit may sense a touch input by driving electrodes around the sub-pixel SP. The source read-out circuit 12 may drive an electrode through the touch line TL and receive an analog signal from the electrode.

The source readout circuit 12 is connected to a bonding pad of the panel 11 in a tape automated bonding (TAB) type or a chip on glass (COG) type, or the panel 11 ) may be formed directly, or may be formed by being integrated in the panel 11 according to an embodiment. In addition, the source read-out circuit 12 may be implemented as a chip on film (COF) type.

The gate driving circuit 13 may supply a gate driving signal of a turn-on voltage or a turn-off voltage to the gate line GL. When the gate driving signal of the turn-on voltage is supplied to the sub-pixel SP, the sub-pixel SP is connected to the data line DL. In addition, when the gate driving signal of the turn-off voltage is supplied to the sub-pixel SP, the connection between the sub-pixel SP and the data line DL is released.

The touch modulation circuit 14 may generate a zero load driving signal (ZLD) and transmit it to the panel and gate driving circuit 13 in order to reduce the effect of the parasitic capacitance of the touch sensor on the sensing result. The zero load driving signal ZLD may have the same phase as the driving signal driving the touch sensor. When the zero load driving signal ZLD is applied to the positive electrode of the parasitic capacitor together with the driving signal, the amount of charge charged in the parasitic capacitor becomes 0, and the parasitic capacitance may disappear.

The timing controller 15 may supply a control signal to the gate driving circuit 13 and the microcontroller 16 . For example, the timing controller 15 may transmit a gate control signal for starting a scan to the gate driving circuit 13 . In addition, the timing controller 15 may output the image data RGB to the microcontroller 16 . Also, the timing controller 15 may transmit a data control signal DCS for controlling the source readout circuit 12 to supply a data voltage to each sub-pixel SP to the microcontroller 16 . In addition, the timing controller 15 transmits a touch control signal TCS for controlling the source readout circuit 12 to sense the touch input by driving the touch electrode of each sub-pixel SP to the microcontroller 16 . can

The microcontroller 16 may send and receive data to and from the source readout circuit 12 . The microcontroller 16 transmits control data for controlling the source readout circuit 12 , the image data RGB applied to the panel 11 , and a clock for synchronizing the data to the source readout circuit 12 . can The source read-out circuit 12 may generate sensing data by sensing a touch or proximity of an external object from the touch sensor, and transmit the sensed data to the microcontroller 16 .

The microcontroller 16 and the source readout circuit 12 may communicate based on a serial peripheral interface (SPI) method or an inter-integrated circuit (I2C) method. In the SPI or I2C method, communication subjects may operate as a master and a slave, and the microcontroller 16 may operate as a master and the source readout circuit 12 as a slave, respectively. There may be a plurality of source readout circuits 12 , each of which may act as a slave to the microcontroller 16 .

The power management circuit 17 may supply power to the panel 11 , the source readout circuit 12 , the gate driving circuit 13 , the touch modulation circuit 14 , the timing controller 15 , and the microcontroller 16 . have. The power management circuit 17 may supply power by transmitting a driving voltage through a power line. Driving voltages having different voltage values may be applied to each circuit. The power management circuit 17 may serve as a power supply source for an internal circuit of the display device 10 .

The host 18 may supply power to the power management circuit 17 . The power management circuit 17 generates driving power from the power received from the host 18 , the panel 11 , the source readout circuit 12 , the gate driving circuit 13 , the touch modulation circuit 14 , and the timing The driving power may be supplied to a circuit inside the display device 100 such as the controller 15 and the microcontroller 16 . Accordingly, the power supplied by the host 18 to the power management circuit 17 may be a source of power supplied by the power management circuit 17 .

When the host 18 supplies power to the power management circuit 17 , the host 18 may supply two types of power: main power and sub power. The main power may be power for a circuit involved in the display of the display device 10 , and the sub power may be power for a circuit involved in touch sensing of the display device 10 . The host 18 provides each power in the form of voltage and current, and the main power may have a main voltage (V_D) of approximately 5V and a display current of 2 to 3A. The sub-power may have a sub-voltage (V_T) of approximately 5V and a touch current of 0.5A or less. Since the power consumption in the display operation of the display device 10 is much higher than that in the touch sensing operation, the display current may be higher than the touch current even though the voltages are the same.

Since the main power and the sub power are provided in the form of voltage and current, the supply of the main power is described below by replacing the supply of the main voltage or the supply of the display current, and the supply of the sub power is the supply of the sub voltage or the supply of the touch current. can be replaced by .

The power management circuit 17 may process the power received from the host 18 into a voltage and current suitable for each circuit, and supply the processed power to each circuit. The main power is processed to be supplied to a circuit involved in the display, such as the timing controller 15 or the gamma circuit, and the sub power is supplied to the circuit involved in touch sensing, such as the touch modulation circuit 14 or the microcontroller 16. can be processed.

2 is a block diagram of a display device showing a subdivided power management circuit.

Referring to FIG. 2 , the flow of the subdivided power management circuit 17 and the power or signal supplied therefrom is shown. The power management circuit 17 may be subdivided for each function, and the power management circuit 17 may include a plurality of power circuits 17-1 to 17-5 therein according to its functions. The plurality of power circuits 17-1 to 17-5 include a first power circuit 17-1, a second power circuit 17-2, a third power circuit 17-3, and a fourth power circuit 17. -4) and a fifth power circuit 17-5.

The plurality of power supply circuits 17-1 to 17-5 may generate power for driving a circuit allocated from main power or sub-power, and supply the power to the allocated circuit.

Some of the plurality of power circuits 17-1 to 17-5 may drive a combined circuit formed by integrating a display circuit and a touch circuit together. Here, the display circuit includes a circuit involved in a display operation of the display device 10 that outputs image data through pixels, and the touch circuit is a touch circuit of the display device 10 that senses touch or proximity of an external object through a touch electrode. It can encompass circuits involved in the touch sensing operation.

For example, the display circuit includes a gamma circuit 21 for generating a gamma voltage corresponding to a grayscale in order to generate a data voltage corresponding to the image data RGB, and a source readout circuit 12 for outputting a data voltage. ) may include an internal source driver circuit and a timing controller 15 for controlling the source driver and supplying image data RGB. The touch circuit controls the read-out circuit included in the touch modulation circuit 14 and the source read-out circuit 12 for generating a touch driving voltage VCOM_M for driving the touch electrode, and receives touch data to calculate touch coordinates. It may include a microcontroller 16 that

In general, each circuit is involved in only one of the display operation and the touch sensing operation, but the combination circuit may be involved in both the display operation and the touch sensing operation. The combination circuit may have a form in which a display circuit and a touch circuit are integrated together. For example, the coupling circuit may include a source read-out circuit 12 in which a source driver circuit and a read-out circuit are integrated together.

The first power circuit 17-1 may supply power to a combination circuit including a display circuit and a touch circuit. The first power circuit 17-1 may supply power to the source readout circuit 12 as a coupling circuit. The source read-out circuit 12 may include a source driver that is a display circuit and a read-out circuit that is a touch circuit. The first power circuit 17 - 1 may generate the display analog voltage AVDD_D to drive the source readout circuit 12 . The first power circuit 17 - 1 generates an analog voltage (AVDD: analog VDD) to supply power, and in particular, may generate an analog voltage from the main voltage V_D. The display analog voltage AVDD_D may mean an analog voltage generated based on the main voltage V_D. The source read-out circuit 12 may operate by receiving the display analog voltage AVDD_D.

Here, since the source read-out circuit 12 is a configuration that consumes the most power among the display device 10 , the first power circuit 17-1 supplying power to the source read-out circuit 12 is a sub-voltage (V_T). ), it may be preferable to use the main voltage (V_D) instead.

Also, the first power circuit 17-1 may supply power to the touch circuit. The first power circuit 17 - 1 may supply power to the touch modulation circuit 14 as a touch circuit. In order to supply power to the touch modulation circuit 14 , the first power circuit 17 - 1 may generate a common voltage VCOM and transmit it to the touch modulation circuit 14 . The touch modulation circuit 14 may generate a touch driving voltage VCOM_M for driving the touch electrode from the common voltage VCOM. The touch modulation circuit 14 may transmit the touch driving voltage VCOM_M to the source readout circuit 12 .

The second power circuit 17 - 2 may supply power to the touch circuit. The second power circuit 17 - 2 may supply power to the touch modulation circuit 14 as a touch circuit. The second power circuit 17 - 2 may generate a gate low voltage VGL and a gate high voltage VGH and transmit them to the touch modulation circuit 14 . The touch modulation circuit 14 may generate a zero load driving signal such as the modulation gate low voltage VGL_M using the gate low voltage VGL and the gate high voltage VGH to drive the touch electrode of the panel 11 .

The third power circuit 17 - 3 may supply power to the microcontroller 16 by converting power received from the host 18 . The third power circuit 17 - 3 may include a step down converter or a buck converter (BUCK) that converts an output voltage to be lower than an input voltage. For example, the third power circuit 17-3 may convert the voltage of the sub-power of 5V into a voltage of 1.8V or 3.3V. The third power circuit 17 - 3 may transmit the converted voltage to the microcontroller 16 .

The fourth power circuit 17 - 4 may supply power to the gamma circuit 21 by converting power received from the host 18 . The fourth power circuit 17 - 4 may include a buck converter BUCK. The fourth power circuit 17 - 4 may convert the main voltage V_D from the host 18 and drive the gamma circuit 21 through the converted voltage.

The fifth power circuit 17 - 5 may supply power to the timing controller 15 by converting power received from the host 18 . The fifth power circuit 17 - 5 may include a buck converter BUCK. The fifth power circuit 17 - 5 may convert the main voltage V_D from the host 18 and drive the timing controller 15 through the converted voltage.

The source readout circuit 12 may operate by receiving power from the first power circuit 17-1. The source read-out circuit 12 may receive the display analog voltage AVDD_D to operate an internal circuit. The source driver circuit and the read-out circuit integrated together in the source read-out circuit 120 may operate using the display analog voltage AVDD_D as power.

The touch modulation circuit 14 may provide a driving voltage to the source readout circuit 120 . The touch modulation circuit 14 may receive the common voltage VCOM from the first power circuit 17-1 to generate a touch driving voltage VCOM_M for driving the touch electrode. In addition, the touch modulation circuit 14 may receive the gate low voltage VGL and the gate high voltage VGH from the second power supply circuit 17 - 2 to generate the modulation gate low voltage VGL_M applied to the touch electrode.

The timing controller 15 may operate by receiving power from the fifth power circuit 17 - 5 . The timing controller 15 may control the source readout circuit 12 by transmitting the control signal DCS and the image data RGB.

The microcontroller 16 may transmit a control signal to control the source read-out circuit 12 , and may receive a data signal from the source read-out circuit 12 to determine a touch. The data signal may include information on whether an external object is touched or approached.

The gamma circuit 21 may receive power from the fourth power circuit 17 - 4 to generate a gamma voltage. Also, the gamma circuit 21 may receive the display analog voltage AVDD_D from the first power circuit 17 - 1 . An amplifier of the gamma circuit 21 may receive a voltage from the fourth power circuit 17 - 4 through an input terminal, and may receive a display analog voltage AVDD_D through a bias terminal. The amplifier may generate a gamma voltage from the voltage of the fourth power circuit 17 - 4 and the display analog voltage AVDD_D.

The host 18 may supply main power to the power management circuit 170 through a power line. The power supplied by the host 18 includes main power and sub power, and each power may flow into the plurality of power circuits 17-1 to 17-5 inside the power management circuit 170 .

For example, the main voltage V_D is provided to the first power circuit 17-1, the fourth power circuit 17-4, and the fifth power circuit 17-5 through the first power line, and is a sub-voltage (V_T) may be provided to the second power circuit 17 - 2 and the third power circuit 17 - 3 through the second power line. In addition, the first power circuit 17-1, the fourth power circuit 17-4, and the fifth power circuit 17-5 may convert the input main power to generate various types of power signals. The second power circuit 17-2 and the third power circuit 17-3 may convert the input sub-power to generate various types of power signals.

Meanwhile, the display device 10 may operate in a normal mode, a display mode, or a sleep mode.

The normal mode indicates a method in which the display device 10 performs both display and touch sensing, the display mode indicates a method in which only display is performed without touch sensing, and the sleep mode indicates a method in which only touch sensing is performed without display. can represent Then, in the normal mode, both the display circuit and the touch circuit operate, in the display mode, the touch circuit does not operate, only the display circuit operates, and in the sleep mode, the display circuit does not operate and only the touch circuit can operate.

Each mode may be implemented by cutting off power supply to the display circuit and the touch circuit. For example, in the normal mode, the host 18 provides both the main voltage V_D and the sub voltage V_T, in the display mode, the host 18 provides only the main voltage V_D, and in the sleep mode, the host 18 ) may provide only the sub-voltage V_T.

If the main voltage V_D and the sub voltage V_T are differentially supplied according to each mode, the combination circuit including the display circuit and the touch circuit cannot receive adequate power. In particular, if the coupling circuit is supplied with power as a source of only one voltage, some circuits of the coupling circuit cannot operate even though they should be operated when the source voltage is cut according to the mode.

For example, the source read-out circuit 12 including the source driver circuit and the read-out circuit receives only the display analog voltage AVDD_D based on the main voltage V_D from the first power supply circuit 17-1 as power. can If the display device 10 operates in the sleep mode, the main voltage V_D may be cut off and the circuit driven by the main voltage V_D may be turned off. A circuit that is generally turned off is a circuit for supplying power to a display circuit such as the timing controller 15 and the gamma circuit 21 and a display circuit such as the first power circuit 17-1, but the display circuit and the touch circuit The coupling circuit including the may also be turned off together. Then, the readout circuit does not receive power even though it should perform touch sensing in the sleep mode, and the touch sensing in the sleep mode cannot be performed properly.

3 is a first configuration diagram of a display device including a switch to supply sub-power in a sleep mode according to an exemplary embodiment.

Referring to FIG. 3 , a display device 300 according to an exemplary embodiment includes a panel 310 , a source read-out circuit 320 , a touch modulation circuit 340 , a timing controller 350 , a microcontroller 360 , and a power supply. It may include a management circuit 370 , a host 380 , and a gamma circuit 390 . The power management circuit 370 may further include a first power circuit 371 , a second power circuit 372 , a third power circuit 373 , a fourth power circuit 374 , and a fifth power circuit 375 . can

Also in the embodiment of the present invention, the display circuit encompasses circuits involved in the display operation of the display device 300 that outputs image data through pixels, and the touch circuit is configured to sense a touch or proximity of an external object through a touch electrode. A circuit involved in the touch sensing operation of the display device 300 may be encompassed. For example, the display circuit may include a gamma circuit 390 , a source driver and a timing controller 350 inside the source readout circuit 320 . The touch circuit may include a touch modulation circuit 340 and a microcontroller 360 . The coupling circuit may include a source read-out circuit 320 in which a source driver circuit and a read-out circuit are integrated together.

The display device 300 according to an exemplary embodiment supplementally supplies the sub-voltage V_T to the coupling circuit receiving power based on the main voltage V_D even when the main voltage V_D is cut off according to the operation mode. The coupling circuit can be operated.

For example, the first power circuit 371 receives the main voltage V_D through the first power line, and applies the main voltage V_D to the first touch circuit or combination circuit operating based on the main voltage V_D. based power can be supplied. The coupling circuit may be a circuit in which the second touch circuit is integrated with one display circuit. The second power circuit 372 may receive the sub voltage V_T through the second power line and supply power based on the sub voltage V_T to the third touch circuit. According to this drawing, the first touch circuit is a touch modulation circuit 340, the second touch circuit is a read-out circuit (not shown) inside the source read-out circuit 320, and the third touch circuit is a touch modulation circuit ( 340) may correspond to each. Here, the touch modulation circuit 340 may receive the sub-voltage V_T when the main voltage V_D is not supplied. Also, the third touch circuit may be understood as a touch circuit other than the touch modulation circuit 340 .

The second power circuit 372 may additionally supply power to the touch circuit by supplying an auxiliary sub-voltage in the sleep mode. In particular, the second power circuit 372 may supply power to the touch circuit inside the coupling circuit.

The second power circuit 372 may receive the sub-power, generate an auxiliary sub-voltage from the sub-power, and supply it to the coupling circuit. For example, the second power circuit 372 may receive the sub-voltage V_T, generate a touch analog voltage AVDD_T from the sub-voltage V_T, and supply it to the coupling circuit.

Therefore, the display device 300 may include a switch 301 for supplying the touch analog voltage AVDD_T in the sleep mode. The switch 301 may be connected between the second power circuit 372 and the source readout circuit 320 .

The switch 301 may control transmission of the auxiliary sub-voltage in the normal mode, the display mode, and the sleep mode. The switch 301 is opened in the normal mode or display mode in which the main voltage V_D is supplied to cut off the supply of the touch analog voltage AVDD_T, and in the touch mode in which the main voltage V_D is not supplied, the switch 301 is short-circuited ( short) to maintain the supply of the touch analog voltage AVDD_T.

The switch 301 may include a diode. The diode 301 may be connected to the second power circuit 372 and the source read-out circuit 320, an anode is connected to the second power circuit 372, and a cathode is connected to the source read-out circuit ( 320) may be connected. The touch analog voltage AVDD_T may be applied from the second power circuit 372 to the source readout circuit 320 .

Also, the cathode of the diode 301 may be connected to the touch modulation circuit 340 . Then, the touch analog voltage AVDD_T may also be applied from the second power circuit 372 to the touch modulation circuit 340 .

When the display analog voltage AVDD_D is supplied to the source readout circuit 320 or the touch modulation circuit 340 in the normal mode or the display mode, the voltage of the cathode of the diode 301 is higher than that of the anode, so that the diode 301 is opened and , the display analog voltage AVDD_D based on the main voltage V_D may be applied to the source readout circuit 320 or the touch modulation circuit 340 .

When the supply of the display analog voltage AVDD_D is cut off in the sleep mode, the voltage of the cathode of the diode 301 is lower than that of the anode, so that the diode 301 is short-circuited, and the touch analog voltage AVDD_T based on the sub-voltage V_T is the source It may be applied to the readout circuit 320 or the touch modulation circuit 340 .

4 is a second configuration diagram of a display device including a plurality of switches to supply sub-power in a sleep mode according to an exemplary embodiment.

Referring to FIG. 4 , the display device 300 according to an exemplary embodiment may further include a second switch 402 in addition to the first switch 301 . The second switch 402 may block leakage of the current by the touch analog voltage AVDD_T to the first power circuit 371 . In particular, the second switch 402 may block current leakage occurring in the sleep mode.

When the main voltage V_D is cut off in the sleep mode, the first power circuit 371 may also be turned off to float, but in some cases, the current of the touch analog voltage AVDD_T may leak and the touch analog voltage AVDD_T ) may be shorted to the ground (GND). The second switch 402 may prevent a short circuit of the touch analog voltage AVDD_T to the ground.

The second switch 402 may be connected between a node where the source readout circuit 320 and the second power circuit 372 meet and the first power circuit 371 .

The second switch 402 may be opened or shorted in the normal mode, the display mode, and the sleep mode. The second switch 402 is short-circuited in the normal mode or display mode to which the main voltage V_D is supplied to conduct the display analog voltage AVDD_D, and is opened in the sleep mode where the main voltage V_D is cut off to open the display analog voltage ( AVDD_D) can be blocked. In addition, the second switch 402 may be opened in the sleep mode to block current due to the touch analog voltage AVDD_T from flowing into the first power circuit 371 .

And the second switch 402 may include a diode. The diode 402 may be connected to the first power circuit 371 and the switch 301 , and an anode may be connected to the first power circuit 371 and a cathode may be connected to the cathode of the diode 301 .

When the display analog voltage AVDD_D is supplied to the source readout circuit 320 or the touch modulation circuit 340 in the normal mode or the display mode, the anode voltage of the diode 402 is higher than the cathode voltage, so that the diode 402 is short-circuited. and the diode 301 is opened, and current leakage due to the touch analog voltage AVDD_T may not occur.

When the supply of the display analog voltage AVDD_D is cut off in the sleep mode, the voltage of the anode of the diode 402 is lower than the cathode voltage, so that the diode 402 is opened and the diode 301 is shorted, and the touch analog voltage AVDD_T is Although leakage of current occurs, it may be blocked by the diode 402 .

5 is a block diagram of a display device including a switch unit to supply sub-power in a sleep mode according to another exemplary embodiment.

Referring to FIG. 5 , a display device 500 according to another exemplary embodiment includes a panel 510 , a source read-out circuit 520 , a touch modulation circuit 540 , a timing controller 550 , a microcontroller 560 , and a power supply. It may include a management circuit 570 , a host 580 , and a gamma circuit 590 . The power management circuit 570 may further include a first power circuit 571 , a second power circuit 572 , a third power circuit 573 , a fourth power circuit 574 , and a fifth power circuit 575 . can

In addition, the display device 500 may further include a switching unit 501 . The switching unit 501 may receive main power and sub power, select any one of the main power and sub power, and transmit it to the first power circuit 571 .

When the switching unit 501 selects the main voltage V_D and transmits it to the first power circuit 571 , the first power circuit 571 operates on the basis of the main voltage V_D as one touch circuit or the one touch. A combination circuit including a circuit and a display circuit may supply power based on the main voltage V_D.

When the switching unit 501 selects the sub-voltage V_T and transmits it to the first power circuit 571 , the first power circuit 571 operates on the basis of the main voltage V_D or the one touch circuit. A combination circuit including a circuit and a display circuit may supply power based on the sub-voltage V_T.

The switching unit 501 may be connected as an input to the first power line supplying the main voltage V_D and the second power line supplying the sub voltage V_T as an input, and may be connected as an output to the first power circuit 571 . .

The switching unit 501 may control the main power through the first switch 501a and control the sub-power through the second switch 501b. In the normal mode or display mode in which the main voltage V_D is supplied, the first switch 501a is shorted and the second switch 501b is opened, and the main voltage V_D is supplied to the first power circuit 571. can The first power circuit 571 may supply power based on the main voltage V_D to the touch circuit or a combination circuit including the touch circuit. In the sleep mode in which the supply of the main voltage V_D is cut off, the first switch 501a is opened and the second switch 501b is short-circuited, and the sub-voltage V_T can be supplied to the first power circuit 571 . have. The first power circuit 571 may supply power based on the sub-voltage V_T to the touch circuit or a combination circuit including the touch circuit.

In addition, each of the first switch 501a and the second switch 501b may include a diode. The first diode 501a may be connected between a first power line supplying the main voltage V_D and a node where the first power circuit 571 and the second diode 501b meet. The second diode 501b may be connected between a second power line supplying the sub-voltage V_T and a node where the first power circuit 571 and the first diode 501a meet. The cathodes of the first diode 501a and the second diode 501b are connected to each other, the anode of the first diode 501a is connected to the first power line, and the anode of the second diode 501b is connected to the second power line can be connected to

When the main voltage V_D is supplied in the normal mode or the display mode, the anode voltage of the first diode 501a is higher than the cathode voltage, so that the first diode 501a is short-circuited, and the main voltage V_D is applied to the first to third power circuits. (571-573) can be supplied.

In the sleep mode, when the supply of the main voltage V_D is cut off and the sub-voltage V_T is supplied, the anode voltage of the second diode 501b is higher than the cathode voltage, so that the second diode 501b is short-circuited and the sub-voltage V_T. may be supplied to the first to third power circuits 571 to 573 .

Therefore, when the switching unit 501 selects the main voltage V_D in the normal mode or the display mode and supplies it to the first power circuit 571 , the first power circuit 571 performs one touch based on the main voltage V_D. Power - for example, the display analog voltage AVDD_D - may be supplied to a circuit or a combination circuit in which the touch circuit and the display circuit are integrated together. In addition, when the switching unit 501 selects the sub voltage V_T in the sleep mode and supplies it to the first power circuit 571 , the first power circuit 571 operates one touch circuit or the above based on the sub voltage V_T. Power - for example, a touch analog voltage (AVDD_T) - may be supplied to the coupling circuit.

6 is a partial configuration diagram of a display device showing sleep mode detection of a microcontroller according to another exemplary embodiment.

Referring to FIG. 6 , a display device 500 according to another exemplary embodiment may include a first power circuit 610 , a second power circuit 620 , and a mode signal generator 630 . The first power circuit 610 and the second power circuit 620 may include some of a plurality of power circuits for each function in the power management circuit.

The first power circuit 610 may supply power to one touch circuit driven through the main voltage V_D in the normal mode or the display mode or a combination circuit including the one touch circuit. The one touch circuit may be a touch modulation circuit 540 and a microcontroller 560 , and the combination circuit may be a source readout circuit 520 .

When the first switch 501a of the switching unit 501 is short-circuited and the second switch 501b is opened in the normal mode or the display mode, the first power circuit 610 receives the main voltage V_D, and the main voltage (V_D) may be converted, and the converted voltage may be supplied to the source readout circuit 520 , the touch modulation circuit 540 and the microcontroller 560 .

The first power circuit 610 may supply power to one touch circuit driven through the main voltage V_D or a combination circuit including the one touch circuit even in the sleep mode. However, the first power circuit 610 may supply power through the sub voltage V_T instead of the main voltage V_D in the sleep mode.

In the sleep mode, when the first switch 501a of the switching unit 501 is opened and the second switch 501b is short-circuited, the first power circuit 610 receives the sub-voltage V_T, and the sub-voltage V_T , and the converted voltage may be supplied to the source readout circuit 520 , the touch modulation circuit 540 and the microcontroller 560 .

The second power circuit 620 may supply power to one display circuit driven through the main voltage V_D in the normal mode or the display mode. The one display circuit may be a display driving circuit 621 and a timing controller 550 .

Regardless of whether the switching unit 501 is opened or closed in the normal mode or the display mode, the second power circuit 620 receives the main voltage V_D, converts the main voltage V_D, and converts the converted voltage to the display driving circuit ( 621) and the timing controller 550 may be supplied.

The second power circuit 620 may not supply power to one display circuit driven through the main voltage V_D in the sleep mode. In the sleep mode, regardless of whether the switching unit 501 is opened or closed, the second power circuit 620 does not receive either the main voltage V_D or the sub voltage V_T, and the display driving circuit 621 and the timing controller 550 ) may not supply power.

Meanwhile, the mode signal generator 630 may generate a mode signal SIG_MODE including information on the supply of main power and transmit it to the microcontroller 560 . The microcontroller 560 may control the first power circuit 610 according to the mode signal SIG_MODE.

When the mode signal SIG_MODE indicates the sleep mode, the microcontroller 560 may control the first power circuit 610 to stop supplying power to the display circuit. However, the microcontroller 560 may control the first power circuit 610 to supply power to the combined circuit including the touch circuit and the display circuit. For example, the microcontroller 560 may stop supplying power to the display circuit in the sleep mode, but may supply power to the source readout circuit 520 including the readout circuit.

Also, when the mode signal SIG_MODE indicates the sleep mode, the switching unit 510 may operate to select the sub-voltage V_T. The first power circuit 610 receives the sub-voltage V_T and based on the sub-voltage V_T, a touch circuit - for example, a source read-out circuit 520 , a touch modulation circuit 540 and a microcontroller 560 . - can supply power.

7 is a diagram illustrating a mode signal generator generating a sleep mode signal according to another exemplary embodiment.

Referring to FIG. 7 , the configuration of the mode signal generator 630 according to another embodiment is illustrated. The mode signal generator 630 may include a voltage divider. The mode signal generator 630 may include a plurality of resistors R1 and R2 to form a voltage divider. The plurality of resistors R1 and R2 may be the same as or different from each other.

When the main voltage V_D flows through the first power line in the normal mode or the display mode, the mode signal generator 630 may generate the mode signal SIG_MODE indicating the normal mode or the display mode. For example, the mode signal SIG_MODE may have a level to which the main voltage V_D is divided with respect to the plurality of resistors R1 and R2.

When the main voltage V_D does not flow through the first power line in the sleep mode, the mode signal generator 630 may generate a mode signal SIG_MODE indicating the sleep mode. For example, the mode signal generator 630 may be connected to the ground GND so that the mode signal SIG_MODE may have a level of 0 (zero).

The microcontroller 560 may receive a mode signal SIG_MODE of a different level for each mode, and control the first power circuit 610 according to the mode signal SIG_MODE.

8 is a block diagram of a display device including a pull-up switch for shutting off sub-power in a display mode according to another exemplary embodiment.

Referring to FIG. 8 , a display device 800 according to another exemplary embodiment includes switching units S1 , S2 , S3 , and S4 , power management circuits 811 , 812 , 813 , a source readout circuit 820 , and a mode It may include a signal generator 830 , a touch modulation circuit 840 , a timing controller 850 , a microcontroller 860 , and a gamma circuit 890 . And the switching unit (S1, S2, S3, S4) includes a first switch (S1), a second switch (S2), a third switch (S3) and a fourth switch (S4), the power management circuit (811, The 812 and 813 may include a first power circuit 811 , a second power circuit 812 , and a third power circuit 813 .

The first switch S1 and the second switch S2 may select any one of the main voltage and the sub voltage and transmit the selected one of the main voltage and the sub voltage to the first power circuit 811 . The first switch S1 and the second switch S2 may control supply of the main voltage through opening and closing.

The first switch S1 may be short-circuited in the normal mode or the display mode to supply the main voltage, and may be opened in the sleep mode to cut off the main voltage. At the same time, the second switch S2 may be opened in the normal mode or the display mode to cut off the sub-voltage, and may be short-circuited in the sleep mode to supply the sub-voltage.

The third switch S3 may control opening and closing of the second switch S2 . When the microcontroller 860 receives the mode signal SIG_MODE, the microcontroller 860 generates a control signal to control the opening and closing of the third switch S3, and the third switch S3 is the second switch S2 ) can be controlled.

The fourth switch S4 may control opening and closing of the first switch S1 . When the microcontroller 860 receives the mode signal SIG_MODE, the microcontroller 860 generates a control signal to control the opening and closing of the third switch S3, and the third switch S3 is the fourth switch S4 ) can be controlled. The fourth switch S4 may control opening and closing of the first switch S1 .

The switching units S1 , S2 , S3 , and S4 may be formed of a diode or a combination of a diode and a transistor. The transistor may include a bipolar junction transistor (BJT) or a field effect transistor (FET).

The first power circuit 811 is connected to the first switch S1 and the second switch S2, and one touch circuit operating based on the main voltage or another touch circuit is integrated with one display circuit to provide power to the combined circuit. can supply When the first switch S1 is short-circuited (the second switch S2 is open) in the normal mode or the display mode to transmit the main voltage, the first power circuit 811 transmits power based on the main voltage to the other touch circuit. can supply In the sleep mode, when the first switch S1 is opened (the second switch S2 is short-circuited) to transmit a sub-voltage, the first power circuit 811 may supply power based on the sub-voltage to the other touch circuit. . Here, one touch circuit may be a touch modulation circuit 840 , and the other touch circuit may be a read-out circuit of the source read-out circuit 820 .

The second power circuit 812 may include a buck converter that converts the output voltage of the sub-power to be lower than the input voltage. The third power circuit 813 may include a buck converter BUCK that converts an output voltage for main power to be lower than an input voltage. For example, the second power circuit 812 may convert the voltage of the sub-power of 5V into a voltage of 1.8V or 3.3V. The second power circuit 812 may transmit the converted voltage to the microcontroller 860 .

The microcontroller 860 may receive the mode signal SIG_MODE for the supply of the main voltage from the mode signal generator 830 . The microcontroller 860 may transmit synchronization signals TSYNC and VSYNC to the timing controller 850 .

According to another embodiment, the display device 800 may further include a pull-up switch 801 . The pull-up switch 801 ( S_PU ) is connected between the first power line and the second power line to stabilize the opening of the first switch in the sleep mode in which the supply of the main voltage is cut off. That is, the pull-up switch 801, S_PU may pull up the second switch S2. The pull-up switch 801 is formed of a diode, and an anode may be connected to the first power line and a cathode may be connected to the second power line, respectively.

In the display mode in which the sub voltage is cut off and the main voltage is supplied, the second switch S2 may be in a floating state. If the second switch S2 is floating, the opening of the second switch S2 in the sleep mode may not be properly maintained. The pull-up switch 801, S_PU - for example, a diode - applies a voltage to the second switch S2 by the difference between the main voltage and the threshold voltage, thereby removing the floating state of the second switch S2 and turning off state can be maintained.

Claims (19)

a display circuit operable to output image data through pixels;
a touch circuit operable to sense a touch or proximity of an external object through a touch electrode;
In a first touch circuit that receives a main voltage through a first power line and operates based on the main voltage or a second touch circuit is integrated with one display circuit and operates based on the main voltage, a first power circuit for supplying power based on the main voltage; and
and a second power supply circuit that receives a sub-voltage through a second power line and supplies power based on the sub-voltage to a third touch circuit,
The second power circuit generates an auxiliary sub voltage from the sub voltage, and supplies the auxiliary sub voltage to the coupling circuit to supply power to the second touch circuit. According to claim 1,
The second power circuit generates the auxiliary sub voltage in a sleep mode in which the supply of the main voltage to the first power circuit is cut off and supplies power to the second touch circuit. 3. The method of claim 2,
Further comprising a first switch connected between the second power circuit and the coupling circuit or between the second power circuit and the first touch circuit,
The first switch is configured to control transmission of the auxiliary sub-voltage in a normal mode in which the main voltage is supplied to the first power circuit and in the sleep mode. According to claim 1,
and the one display circuit includes a source driver circuit that outputs a data voltage corresponding to the image data. According to claim 1,
The first touch circuit includes a touch modulation circuit for generating a driving voltage for driving the touch electrode,
and the second touch circuit includes a readout circuit for generating touch data representing the touch or proximity. 4. The method of claim 3,
The first switch may include a diode. 4. The method of claim 3,
Further comprising a second switch connected between the first switch and the first power circuit,
The second switch is configured to block leakage of a current generated by the auxiliary sub-voltage to the first power circuit. According to claim 1,
The coupling circuit includes a source read-out circuit. a display circuit operable to output image data through pixels;
a touch circuit operable to sense a touch or proximity of an external object through a touch electrode;
a switching unit connected to a first power line to which a main voltage is supplied and a second power line to which a sub voltage is supplied; and
A first touch circuit or a second touch circuit connected to the switching unit and operated based on the main voltage is integrated with a display circuit, and power based on the main voltage is applied to a coupling circuit operated based on the main voltage. including a power supply circuit for supplying
The switching unit selects any one of the main voltage and the sub voltage and transmits it to the power circuit,
The power supply circuit supplies power based on the main voltage to the second touch circuit when receiving the main voltage, and supplies power based on the sub voltage to the second touch circuit when receiving the sub voltage. . 10. The method of claim 9,
The switching unit may include a first switch controlling a current of the main voltage and a second switch controlling a current of the sub voltage, and controlling the current through opening and closing of the first switch and the second switch. . 11. The method of claim 10,
The first switch and the second switch include a diode or a transistor. 11. The method of claim 10,
A pull-up switch connected between the first power supply line and the second power supply line and stabilizing the opening of the second switch in a display mode in which the supply of the sub voltage is cut off and the main voltage is supplied. ) further comprising a display device. 10. The method of claim 9,
The switching unit selects the sub voltage in a sleep mode in which the supply of the main voltage is cut off,
The power circuit may be configured to supply power based on the sub-voltage to the second touch circuit in the sleep mode. 10. The method of claim 9,
The switching unit selects the main voltage in a display mode in which the main voltage is supplied and in a normal mode in which both the main voltage and the sub voltage are supplied,
The power circuit may be configured to supply power based on the main voltage to the second touch circuit in the display mode and the normal mode. 10. The method of claim 9,
and a microcontroller that receives a mode signal indicating whether the main voltage is supplied and controls the power circuit according to the mode signal. 16. The method of claim 15,
The switching unit selects the sub-voltage when the mode signal indicates a sleep mode in which the supply of the main voltage is cut off,
The power circuit receives the sub-voltage and supplies power based on the sub-voltage to the second touch circuit. 17. The method of claim 16,
The power circuit supplies power to the one display circuit and another display circuit,
The microcontroller controls the power circuit to stop supplying power to the other display circuit in the sleep mode. 10. The method of claim 9,
and the one display circuit includes a source driver circuit that outputs a data voltage corresponding to the image data. 10. The method of claim 9,
The first touch circuit includes a touch modulation circuit for generating a driving voltage for driving the touch electrode,
and the second touch circuit includes a readout circuit for generating touch data representing the touch or proximity.

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