KR20170038307A - Display Device Including Touch Panel And Method For Driving the Same - Google Patents

Abstract

The present invention relates to a display device including a touch panel, which may reduce power consumption thereof by interrupting driving a driving circuit configured to drive a driving circuit for driving a display panel or interrupting driving a touch sensing circuit for driving the touch panel, when the driving of the driving circuit configured to drive the display panel or the touch panel is unnecessary, and a method for driving the same. A first abnormality signal is received when connection between an external set and a timing controller is abnormal and a second abnormality signal is received when connection between the external set and an MCU is abnormal. Further, when the first abnormality signal is input, driving of a gate driver and a source driver IC configured to drive the display panel is interrupted, and when the second abnormality signal is input, driving of a touch sensing IC configured to drive the touch panel is interrupted.

Description

[0001] The present invention relates to a display device including a touch panel and a method of driving the same,

The present invention relates to a display device, and more particularly to a display device that determines whether an image is input or a touch panel is driven, and drives the display panel and the touch panel when the image is not input or when the touch panel is not driven To a display device for reducing power consumption by interrupting the operation of a circuit.

Specific examples of the flat panel display include a liquid crystal display (LCD) device, an organic light emitting display device, a plasma display panel (PDP) device, a quantum dot display device ), A field emission display device (FED), and an electrophoretic display device (EPD). The flat display panel, which realizes images in common, is an essential component, The flat panel display panel has a structure in which a pair of transparent insulation substrates are bonded together with inherent light emission, polarization, or other optical material layers interposed therebetween.

On the other hand, there is a growing demand for a touch screen capable of recognizing a touch area through a human hand or a separate input device and transmitting additional information in response to such a display device.

Since the display device to which the touch screen is added needs to drive both the display panel and the touch panel, the power consumption is relatively large. In particular, a display device to which a touch screen is conventionally driven unnecessarily consumes unnecessary power because it drives both the display panel and the driving circuit for driving the touch panel unnecessarily, even when the display panel or the touch panel is not driven.

Disclosure of the Invention The present invention has been conceived to solve the above-described problems, and it is an object of the present invention to provide a touch panel that stops driving of a driving circuit for driving a display panel or a touch sensing circuit for driving a touch panel when driving of a driving circuit for driving a display panel or a touch panel is unnecessary And a display device including the touch panel capable of reducing power consumption and a method of driving the same.

According to an aspect of the present invention, there is provided a display device including a touch panel according to the present invention, including: a first abnormal signal when an abnormality occurs in connection between an external set and a timing controller of a display device; And stops the driving of the gate driver and the source driver IC for driving the display panel when the first abnormality signal is inputted and stops the driving of the source driver IC when the second abnormality signal is input. The driving of the driven touch sensing IC is stopped.

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

In this case, when the first selection signal is inputted from the outside, the driving of the gate driver and the source driver IC is stopped by the first abnormal signal, and when the second selection signal is input from the outside, And the source driver IC are stopped.

A display device including a touch panel according to the present invention includes an MCU for touch sensing or a circuit for sensing whether an abnormal state of connection between an external set and a timing controller for driving the display device is detected, Or the circuit for driving the touch panel is not driven, thereby saving unnecessary power consumption.

On the other hand, even when the connection between the display panel and the external set is normal, the presence or absence of the input video is discriminated and the driving of the circuit for driving the display panel is stopped even when the image is not input from the outside, .

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

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

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

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

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

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

In the case where the display panel is an organic light emitting display, each pixel is provided with an organic light emitting device OLED composed of an organic light emitting layer between the anode and the cathode, and a pixel circuit for independently driving the organic light emitting device OLED.

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

The pixel circuit includes at least one switching transistor TR1, TR3, at least one capacitor Cst, and a driving transistor TR2. The plurality of switching transistors TR1 and TR3 charge a data signal to a capacitor Cst in response to a scan signal generated in units of horizontal periods. The driving transistor TR2 supplies the constant voltage V _DD to the organic light emitting element in accordance with the data voltage charged in the capacitor Cst to drive the organic light emitting element OLED.

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

When the display panel is a liquid crystal display device, each pixel is provided with a thin film transistor (TFT) and a liquid crystal capacitor Clc connected to the thin film transistor. The liquid crystal capacitor Clc is composed of a pixel electrode connected to the thin film transistor, and a common electrode Vcom arranged between the pixel electrode and the liquid crystal. The thin film transistor supplies a video signal from each data line DL to the pixel electrode in response to a scan pulse from each gate line GL.

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

The touch panel is located on the upper side of the display panel and has a touch sensing method such as a depressurization type or capacitive type. A typical example of capacitive touch panel will be described as follows.

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

The capacitive touch panel includes a plurality of first electrodes 115 arranged in the x-axis direction and connected to each other through the bridge 112 and the contact holes 114, and a plurality of second electrodes arranged in the y- / RTI >

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

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

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

On the other hand, a touch panel of mutual capacitance type may be used.

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

The timing controller 4 generates various signals for aligning a video signal inputted from the outside and driving the gate driver 2 and the driving IC 3.

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

The driving IC 3 converts the touch signal input from the touch panel to digital sensing data and transmits the digital sensing data to the MCU 5. The MCU 5 generates the touch coordinates using the digital sensing data, .

To this end, the driving IC includes a source driver IC for driving the data lines DL, a touch sensing IC for sensing a touch signal from the touch panel, converting the sensing signal into digital sensing data, and transmitting the sensing signal to the MCU 5.

The timing controller 4 according to the present invention is configured such that when at least one of the MCU 5 or the timing controller 4 is in an abnormal state in connection with the external set 15, When the connection between the MCU 5 and the external set 15 is in an abnormal state, the second abnormal signal DET2 is received to generate a sensing signal for driving the touch sensing IC And stops driving the touch sensing IC. When the connection between the timing controller 4 and the external set 15 is in an abnormal state, the first external signal DET1 is input to drive the source driver IC The generation of the signal is stopped and the driving of the gate driver 2 and the source driver IC is stopped.

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

Fig. 4 is an exemplary diagram for explaining the drive IC control unit 6 and the drive IC 3 provided in the timing controller 4. Fig.

The drive IC control unit 6 generates a drive signal for driving the gate driver 2 and the source driver IC 11 and generates a drive signal when the abnormality of the connection state between the timing controller 4 and the external set 15 occurs The control circuit controls the source driver IC 11 so that the generation of the driving signal is stopped and the driving of the gate driver 2 and the source driver IC 11 is interrupted, And a panel drive signal generating unit 8.

The driving IC control unit 6 generates a sensing signal for driving the touch sensing IC 12 and receives the second abnormal signal DET2 when the connection with the external set 15 of the touch panel is abnormal And a touch panel drive signal generation unit 9 for stopping the generation of the sensing signal and controlling the touch sensing IC so that the driving of the touch sensing IC is interrupted.

At this time, the MCU 5 confirms the connection state between the external set 15, the timing controller 4, and the MCU 5, and when an abnormality occurs in the connection state, the first abnormality signal DET1 or the second abnormality signal (DET2).

At this time, the first abnormal signal DET1 may be generated in the external set and input to the MCU 5, and may be generated and output by detecting the abnormality in the MCU 5.

The first abnormal signal DET1 may also be directly input from the external set 15 to the timing controller 4. [

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

The MCU 5 determines whether or not an abnormality has occurred in the connection between the timing controller 4 and the external set 15 of the MCU 5. [ The MCU 5 outputs the first abnormality signal DET1 to the display panel drive signal generation unit 8 when an abnormality occurs in the connection between the display panel and the external set 15, And outputs a second abnormal signal (DET2) to the touch panel drive signal generator (9) when an abnormality occurs in the connection.

On the other hand, the MCU 5 receives the first abnormal signal DET1 from the external set 15 and outputs it to the display panel driving signal generating unit 8. The first and second abnormal signals DET1, DET2 can be output simultaneously.

The first abnormal signal DET1 may also be directly input from the external set 15 to the timing controller 4. [

The display panel drive signal generating unit 8 receives the first abnormal signal DET1 and stops generation of the drive signal and stops the driving of the gate driver 2 and the source driver IC 11. [ And controls the driver IC 11. The driving of the source driver IC 11 is stopped, and the driving of the display panel is also stopped.

The touch panel driving signal generating unit 9 receives the second abnormal signal and stops the generation of the sensing signal and controls the touch sensing IC 12 so that the driving of the touch sensing IC 12 is interrupted. The driving of the touch sensing IC 12 is stopped, and the driving of the touch panel is also stopped.

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

On the other hand, even when the connection between the timing controller 4 and the external set is normal, the presence or absence of the input image is discriminated and the driving of the circuit for driving the display panel is stopped even when the image is not input from the outside, .

Hereinafter, a display device including a touch panel according to another embodiment of the present invention, which stops the driving of a circuit for driving a display panel by sensing a state of no-image input, will be described.

Fig. 3 is an exemplary diagram for explaining another embodiment of the drive IC control section 6. Fig.

The drive IC control section 6 includes a no signal determination section 10, a selection section 7, a display panel drive signal generation section 8 and a touch panel drive signal generation section 9.

The non-signal determining unit 10 determines the presence or absence of input of image data from the outside, and outputs a third abnormal signal DET3 when no image data is input.

The selector 7 receives the first selection signal S1 or the second selection signal S2 from the outside and outputs the first abnormal signal DET1 when the first selection signal S1 is inputted, And outputs the third abnormal signal DET3 to the display panel drive signal generation unit 8 when the selection signal S2 is inputted. For this, the selector 7 may include a multiplexer (MUX) or the like.

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

The display panel drive signal generating section 8 generates a drive signal for controlling the gate driver 2 and the source driver IC 3 when the first abnormal signal DET1 or the third abnormal signal DET3 is inputted And controls the gate driver 2 and the source driver IC 3 so that the gate driver 2 and the source driver IC 3 stop driving.

The touch panel driving signal generating unit 9 generates a sensing signal for driving the touch sensing IC 12. When the connection to the external set of the touch panel is abnormal, And controls the touch sensing IC to stop the driving of the touch sensing IC.

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

At this time, the first abnormal signal DET1 may be generated in the external set 15 and input to the MCU 5, and may be generated and output by detecting the abnormality in the MCU 5.

The first abnormal signal may also be directly input from the external set 15 to the timing controller 4. [

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

The no signal determination unit 10 determines whether or not image data is not input through any one of an abnormality of a clock pulse period input from the outside, an abnormality of a frame frequency, and an abnormality of the number of vertical blank lines included in one frame And outputs a third abnormal signal to the selection unit 7 when it is determined that the image data is not inputted.

The clock pulse CLK is normally input so as to have a constant frequency when image data is inputted. However, when an error occurs in the input of the video data, the frequency of the clock pulse (CLK) is abnormal. When the frequency of the clock pulse CLK is out of the range that can be recognized by the timing controller 4, the non-signal determining unit 10 uses the above-described characteristic, that is, Or a frequency in which the second reference value is large is input as the non-input state of the image.

The no signal determination unit 10 determines a frame frequency through a period of a period in which the data enable signal DE is input or a period of a vertical blank period in which the data enable signal DE is not input, If the frame frequency is out of the range, that is, if the frame frequency is smaller than the third reference value or larger than the fourth reference value, it can be determined that the image is not in the input state.

Also, the no signal determination unit 10 can determine whether the image is not input through the number of vertical blank lines in one frame. When an image is normally input, the vertical blank line during each frame has a number within a predetermined range. When the number of vertical blank lines in one frame exceeds the predetermined range, that is, the number of vertical blank lines in a frame is larger than the fifth reference value Is smaller than the sixth reference value or is not larger than the sixth reference value.

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

On the other hand, the MCU 5 checks the connection state between the external set 15 and the timing controller 4 or the MCU 3 in the same manner as in the previous embodiment. When an abnormality occurs in the connection state, And the second abnormal signal DET2.

At this time, the first abnormal signal DET1 may be generated in the external set and input to the MCU 5, and may be generated and output by detecting the abnormality in the MCU 5.

The first abnormal signal DET1 may also be directly input from the external set 15 to the timing controller 4. [

At this time, when the abnormality occurs in the connection between the timing controller 4 and the external set 15, the first abnormality signal DET1 is detected. When the abnormality occurs in the connection between the MCU 5 and the external set 15, The output of the signal DET2 is the same as in the previous embodiment.

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

The display panel drive signal generating section 8 generates a drive signal for controlling the gate driver 2 and the source driver IC 3 when the first abnormal signal DET1 or the third abnormal signal DET3 is inputted And controls the gate driver 2 and the source driver IC 3 so that the gate driver 2 and the source driver IC 3 stop driving.

The display panel drive signal generation unit 8 receives the first abnormal signal DET1 or the third abnormal signal DET3 and stops generation of the drive signal and outputs the drive signal to the gate driver 2 and the source driver IC 11 The driving of the source driver IC 11 is stopped. The driving of the source driver IC 11 is stopped, and the driving of the display panel is also stopped.

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

That is, the display device including the touch panel to which the drive IC control unit 6 according to the second embodiment of the present invention is applied detects whether or not the abnormality of the connection with the external controller of the timing controller 4 or the MCU 5 is abnormal It is possible to detect whether the image is not in the non-input state from the outside, stop the driving of the display panel when an abnormality occurs in the connection state with the external set of the timing controller 4 or when the image is not input from the outside, The driving of the touch panel can be stopped when an abnormality occurs in the connection state with the external set of the MCU 5. [

Accordingly, the display apparatus including the touch panel to which the drive IC control unit 6 according to the second embodiment of the present invention is applied can obtain an additional power consumption reduction effect as compared with that of the previous embodiment.

Table 1 below shows the case where the display device including the touch panel according to the present invention stops the driving of the display panel, stops the driving of the touch panel, and stops the power consumption when the driving of the touch panel and the display panel is stopped Respectively.

When both the touch panel and the display panel are stopped, 0 0 is displayed. When the display panel is stopped, only 1 0 is displayed. When only the touch panel is stopped, 0 1 is displayed. 1, and the amount of power consumption for each case is as shown in Table 1.

condition Total power consumption Power consumption change 1 1 7297.1 mW - 1 0 6887.5mW -409mW 0 1 6491.1 mW -806mW 0 0 6131.5mW -1165 mWW

As shown in Table 1, when the driving of the touch panel and the display panel and the driving IC for driving the touch panel and the display panel is stopped, the power consumption is reduced by 1165 mW and about 19%, compared with the case of driving both the touch panel and the display panel .

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

1: Touch and display panel 2: Gate driver
3: driving IC 4: timing controller
5: MCU 6: driving IC control section
7: selection unit 8: display panel drive signal generation unit
9: Touch panel drive signal generating unit 11: Source driver IC
12: Touch sensing IC 15: External set
112: bridge 115: first electrode
116: second electrode 111a, 111b: routing line
114: contact hole

Claims (13)

A display panel including a plurality of pixels arranged in a matrix in an area formed by intersecting a plurality of gate lines and a plurality of data lines,
A touch panel positioned above the display panel,
A gate driver for driving the gate line,
A driver IC including a source driver IC for driving the data lines and a touch sensing IC for sensing sensing data from the touch panel,
A timing controller for aligning video data inputted from the outside and generating a driving signal for driving the source driver IC and the gate driver,
And outputs a second abnormal signal when an abnormality of connection with the external set occurs, and outputs a second abnormal signal when the connection between the timing controller and the external set is established And an MCU for outputting a first abnormal signal input from an external set when an abnormality occurs in the external set or generating and outputting the first abnormal signal,
The timing controller includes:
Generates a driving signal for driving the source driver IC and a sensing signal for driving the touch sensing IC, stops generation of the driving signal when the first abnormal signal is input, And a driving IC control unit for stopping the generation of the sensing signal. The method according to claim 1,
The driving IC includes:
A source driver IC driving the data line and stopping driving when the first abnormal signal is input,
And a touch sensing IC for sensing the sensing data and stopping driving when the second abnormal signal is input. The method according to claim 1,
Wherein the drive IC control section
A display panel drive signal generator for generating a drive signal for driving the source driver IC and stopping generation of the drive signal when the first abnormal signal is input,
And a touch panel driving signal generator for generating a sensing signal for driving the touch sensing IC and stopping the generation of the sensing signal when the second abnormal signal is input. The method of claim 3,
Wherein the drive IC control section
A non-signal determination unit for determining a non-input state of image data input from the outside and outputting a third abnormal signal when the image data is not input,
Further comprising a selector for outputting the first abnormal signal when the first selection signal is inputted from the outside and outputting the third abnormal signal when the second selection signal is inputted,
Wherein the source driver IC stops driving when either the first abnormal signal or the third abnormal signal is input. 5. The method of claim 4,
Wherein the no signal determination unit determines that the image data is not input if the period of the clock pulse input from the outside is smaller than a predetermined first reference value or larger than a second reference value. 5. The method of claim 4,
The non-signal determining unit determines a frame frequency through a period of a data enable signal or a vertical blanking period. If the frame frequency is smaller than a preset third reference value or greater than a fourth reference value, Device. 5. The method of claim 4,
Wherein the no signal determination unit detects the number of vertical blank lines in one frame and judges that the number of vertical blank lines is less than a preset fifth reference value or greater than a sixth reference value, Determining an abnormality of at least one of a connection state between the external set and the timing controller or a connection state between the external set and the MCU for touch sensing,
Outputting a first abnormal signal when an abnormality occurs in the connection state between the external set and the timing controller and outputting a second abnormal signal when an abnormality occurs in the connection state between the external set and the MCU,
When a first abnormal signal is input and at least one of the first abnormal signal and the second abnormal signal is input, generation of a driving signal for driving the gate driver and the source driver IC for driving the display panel is stopped, And stops the driving of the source driver IC,
And stopping the generation of the sensing signal for driving the touch sensing IC for driving the touch panel when the second abnormal signal is input, and stopping the driving of the touch sensing IC. Determining an abnormality of at least one of a connection state between the external set and the timing controller, a state where no image data is inputted from the outside, or a connection state with the MCU for external sensing and touch sensing,
And outputs a first abnormal signal when an abnormality occurs in the connection state between the external set and the display panel and outputs a second abnormal signal when an abnormality occurs in the connection state between the external set and the touch panel, And outputting a third abnormal signal if not,
When at least one of the first to third abnormal signals is input and the first and third abnormal signals are input, generation of a drive signal for driving the gate driver and the source driver IC for driving the display panel is stopped , The driving of the gate driver and the source driver IC is stopped,
And stopping the generation of the sensing signal for driving the touch sensing IC for driving the touch panel when the second abnormal signal is input, and stopping the driving of the touch sensing IC. 10. The method of claim 9,
Wherein the step of stopping the driving of the gate driver and the source driver IC by inputting the first and third abnormal signals comprises:
Further comprising the step of receiving a first abnormal signal after the first selection signal is input and receiving a third abnormal signal after the second selection signal is inputted. 10. The method of claim 9,
Wherein the step of detecting a state in which the image data is not input comprises:
And determining that the video data is not in the input state if the period of the clock pulse input from the outside is smaller than a predetermined first reference value or larger than a second reference value. 10. The method of claim 9,
Wherein the step of detecting a state in which the image data is not input comprises:
Judges a frame frequency through a period of a data enable signal or a vertical blank period and judges the frame frequency as a non-input state of image data when the frame frequency is smaller than a predetermined third reference value or larger than a fourth reference value. 10. The method of claim 9,
Wherein the step of detecting a state in which the image data is not input comprises:
Detecting a number of vertical blank lines in one frame and judging the image data as a non-input state when the number of the vertical blank lines is smaller than a preset fifth reference value or greater than a sixth reference value.

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