KR20210040588A - Organic light emtting display device - Google Patents

Abstract

Provided, in the embodiments of the present invention, are a display device comprising a display panel including a static electricity detection circuit for outputting a static electricity signal corresponding to static electricity, a protection circuit that receives the static electricity signal from the static electricity detection circuit and outputs a protection signal, and a timing controller that receives the first sensing data from the display panel, performs an update operation to update the second sensing data, and stops the update operation when the protection signal is transmitted from the protection circuit; and a driving method thereof. Therefore, the present invention is capable of preventing degradation in image quality.

Description

Display device and its driving method {ORGANIC LIGHT EMTTING DISPLAY DEVICE}

Embodiments of the present invention relate to a display device and a driving method thereof.

As the information society develops, demands for display devices for displaying images are increasing in various forms. As a display device, various display devices such as a liquid crystal display (LCD), a light emitting display (LED), and a quantum dot light emitting display (QLED) are used. .

Among the display devices, a display device employing a light-emitting diode, which is a self-luminous element, can be very excellent in response speed, viewing angle, and color reproducibility because of the light-emitting diodes that emit light by themselves. In addition, there is an advantage in that the thickness of the display device can be implemented to be thin.

A plurality of pixels of such a display device each include a driving transistor that supplies a driving current to the light emitting diode, and the magnitude of the driving current is the threshold voltage of the driving transistor included in each of the pixels, and the characteristics of the pixel including the mobility are Deviation may occur. Due to this variation, the display device may deteriorate in image quality. In addition, there is a problem that the luminance of the light emitting diode decreases due to deterioration due to use. Accordingly, when the display device displays an image, the image quality may be prevented from deteriorating by using a sensing signal that senses a characteristic variation and/or deterioration of a pixel.

In addition, the display device may be damaged due to static electricity, and the generated static electricity may become noise of a sensing signal. Therefore, the display device must be able to prevent damage due to static electricity. In addition, when noise is included in the sensing signal, the display device may have a problem of deteriorating image quality even when the sensing signal is used, so it is necessary to prevent noise due to static electricity from being reflected in the image signal.

Embodiments of the present invention are to provide a display device capable of preventing deterioration of image quality and a driving method thereof.

Embodiments of the present invention provide a display device capable of preventing damage due to static electricity and a driving method thereof.

In one aspect, embodiments of the present invention include a display panel including a static electricity sensing circuit that outputs a static electricity signal corresponding to static electricity, a protection circuit that receives the static electricity signal from the static electricity detection circuit and outputs a protection signal from the display panel. It is possible to provide a display device including a timing controller that receives the first sensing data and performs an update operation of updating the second sensing data, and stops the update operation when a protection signal is transmitted from the protection circuit.

In another aspect, embodiments of the present invention include a display panel in which a static electricity sensing circuit is disposed, and in a method of driving a light emitting display device for correcting an image signal in response to static electricity detected by the static electricity sensing circuit, the image signal Generating a data signal by using and displaying an image on the display panel, receiving a sensing signal from the display panel and generating first sensing data, generating an electrostatic signal in an electrostatic sensing circuit, and by using the electrostatic signal It is possible to provide a method of driving a display device including stopping the update of the second sensing data using the first sensing data for a preset time.

According to embodiments of the present invention, it is possible to provide a display device capable of preventing deterioration of image quality and a driving method thereof.

According to embodiments of the present invention, a display device capable of preventing damage due to static electricity and a driving method thereof can be provided.

1 is a structural diagram illustrating a display device according to example embodiments.
2 is a circuit diagram illustrating a pixel and an analog-to-digital converter connected to the pixel according to example embodiments.
3 is a timing diagram illustrating an operation of a pixel in a display device according to example embodiments.
4 is a conceptual diagram illustrating a relationship in which a display panel and a timing controller are connected to a protection circuit in a display device according to the present invention.
5 is a structural diagram showing an embodiment of a data driver employed in a display device according to the present invention.
6 is a conceptual diagram illustrating a connection relationship between a display panel, a protection circuit, and a timing controller in a display device according to the present invention.
7 is a timing diagram illustrating an operation of a display device according to an exemplary embodiment of the present invention.
8 to 10 are cross-sectional views illustrating arrangements of first and second wirings in the display device according to the present invention.
11 is a flowchart illustrating a method of driving a display device according to example embodiments.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to elements of each drawing, the same elements may have the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, the detailed description may be omitted. When "include", "have", "consists of" and the like mentioned in the present specification are used, other parts may be added unless "only" is used. In the case of expressing the constituent elements in the singular, the case including the plural may be included unless there is a specific explicit description.

In addition, in describing the constituent elements of the present invention, terms such as first, second, A, B, (a) and (b) may be used. These terms are only for distinguishing the component from other components, and the nature, order, order, or number of the component is not limited by the term.

In the description of the positional relationship of components, when two or more components are described as being "connected", "coupled" or "connected", the two or more components are directly "connected", "coupled" or "connected" "It may be, but it should be understood that two or more components and other components may be further "interposed" to be "connected", "coupled" or "connected". Here, the other constituent elements may be included in one or more of two or more constituent elements “connected”, “coupled” or “connected” to each other.

In the description of the temporal flow relationship related to the components, the operation method or the manufacturing method, for example, the temporal precedence relationship such as "after", "after", "after", "before", etc. Alternatively, a case where a flow forward and backward relationship is described may also include a case that is not continuous unless “directly” or “directly” is used.

On the other hand, when a numerical value for a component or its corresponding information (e.g., level, etc.) is mentioned, the numerical value or its corresponding information is related to various factors (e.g., process factors, internal or external impacts, etc.) It can be interpreted as including an error range that can be caused by noise, etc.).

1 is a structural diagram illustrating a display device according to example embodiments.

Referring to FIG. 1, the display device 100 may include a display panel 110, a gate driver 120, a data driver 130, and a timing controller 140.

The display panel 110 includes a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DL, and may include a plurality of pixels 101 connected to the gate line and the data line. Each of the plurality of pixels 101 may include a light emitting diode and a pixel circuit that generates a driving current supplied to the light emitting diode. Each pixel 101 may receive a data signal transmitted through a data line in response to a gate signal transmitted through the gate line. In addition, each pixel 101 may generate a driving current corresponding to the voltage level of the data signal and supply it to the diode.

In addition, the display panel 110 may include a plurality of power lines supplying power to the plurality of pixels 101. However, wirings disposed on the display panel 110 are not limited thereto.

The gate driver 120 may sequentially transmit gate signals to the plurality of gate lines GL1 to GLn. The gate driver 120 may include one or more gate driver integrated circuits (GDIC), and may be located on only one side or both sides of the display panel 100 according to a driving method. . Also, the gate driver 120 may be disposed in a GIO (Gate in Panel) type disposed on the display panel 110, and may be generated at the same time when a pixel circuit is generated on the display panel 110.

The data driver 130 may be connected to the plurality of data lines DL1 to DL and may supply a data signal to the plurality of data lines DL1 to DL. The data driver 130 may include a plurality of integrated circuits. Each of the plurality of integrated circuits included in the data driver 130 may be referred to as a source driver. The number of source drivers may be determined according to the resolution and/or size of the display panel 110.

The timing controller 140 may receive an image signal, correct it, and output it. The image signal output from the timing controller 140 may be supplied to the data driver 130. In addition, the timing controller 140 may control the gate driver 120 and the data driver 130.

2 is a circuit diagram illustrating a pixel and an analog-to-digital converter connected to the pixel according to example embodiments.

Referring to FIG. 2, a pixel 101 supplies a first transistor M1 to supply a driving current in response to a voltage level (Vdata) of a data signal, and a data signal to a first transistor M1 in response to a gate signal. A second transistor (M2) that transmits a sensing control signal, a third transistor (M3) that transmits a sensing signal to the sensing line (SL) in response to a sensing control signal, a storage capacitor (Cst) that maintains the voltage level of the data signal, and a driving current. Thus, it may include a light-emitting diode (LED).

The first transistor M1 may be connected to the power line VL1 through which the first electrode transmits the first power EVDD, and the second electrode may be connected to the first node N1. Also, the gate electrode may be connected to the second node N2. The first transistor M1 may allow a driving current to flow from the first electrode to the second electrode in response to the voltage level Vdata of the data signal transmitted to the second node N2. The driving current may correspond to Equation 1 below.

Here, Id means the current amount of the driving current, Vgs means the voltage difference between the gate electrode and the source electrode of the first transistor M1, and vth means the threshold voltage of the first transistor M1. In addition, k means electron mobility.

In the second transistor M2, a first electrode may be connected to the data line DL and a second electrode may be connected to the second node N2. Also, the gate electrode may be connected to the gate line GL. Since the second transistor M2 can transmit the gate signal to the gate electrode through the gate line GL, the data signal transmitted to the data line DL can be transmitted to the second node N2 in response to the gate signal. have.

In the third transistor M3, a first electrode may be connected to the first node N1 and a second electrode may be connected to the sensing line SL. In addition, the gate electrode may be connected to the sensing control signal line SENSE. The third transistor M3 may transmit the initialization voltages VpreR and VpreS to the first node N1 in response to the sensing control signal transmitted through the sensing control signal line SENSE. In addition, the voltage of the first node N1 may be transmitted to the sensing line SL.

In the storage capacitor Cst, a first electrode may be connected to the first node N1 and a second electrode may be connected to the second node N2. The storage capacitor Cst may maintain a voltage between the first node N1 and the second node N2. Accordingly, the storage capacitor Cst can maintain the voltage level Vdata of the data signal transmitted to the second node N2.

In the diode LED, an anode electrode may be connected to the first node N1 and a second power source EVSS may be transmitted to the cathode electrode. Accordingly, a driving current may flow from the anode electrode to the cathode electrode.

In addition, an analog digital converter 130a may be connected to the sensing line SL. When the sampling switch (SAM) is connected between the sensing line (SL) and the analog digital converter (130a) and the sampling switch (SAM) is turned on, the voltage charged in the sensing line (SL) is transferred to the analog digital converter (130a). I can. The voltage charged in the sensing line SL may be a sensing signal. The sensing signal may be converted into a digital signal by the analog digital converter 130a and output as first sensing data.

The sampling switch SAM may be turned on within a period in which the third transistor M3 is turned on. When the third transistor M3 is turned on, the voltage of the first node N1 may be charged in the sensing line SL. In addition, when the sampling switch SAM is turned on, a voltage charged in the sensing line SL may be transmitted to the analog digital converter 130a.

A first initialization switch RPRE is connected to the sensing line SL, and a first initialization voltage VpreR may be selectively transmitted to the sensing line SL in response to an operation of the first initialization switch RPRE. When the first initialization voltage VpreR is transmitted to the sensing line SL by the first initialization switch RPRE, the sensing line SL may be initialized. During the period in which the first initialization switch RPRE is turned on, the third transistor M3 may also be turned on. In addition, the second initialization switch SPRE is connected to the sensing line SL, and the second initialization switch SPRE may selectively transmit the second initialization voltage VpreS to the sensing line SL.

The analog digital converter 130a may be connected to the sensing line SL. When the sampling switch SAM is turned on, the analog digital converter 130a may receive a sensing signal corresponding to the voltage charged in the sensing line SL from the sensing line SL. The analog digital converter 130a may convert the transmitted sensing signal to output the first sensing data and transmit it to the timing controller 140. The first sensing data transmitted to the timing controller 140 may be used to update the second sensing data previously stored in the timing controller 140.

3 is a timing diagram illustrating an operation of a pixel in a display device according to example embodiments.

Referring to FIG. 3, the display device 100 may be operated by being divided into a pixel driving period Td and a sensing period Ts. The pixel driving period Td is a period in which a driving current flows through the plurality of pixels 101 disposed on the display panel 110, and the sensing period Ts is used to sense a characteristic variation and/or deterioration of the pixel 101. It's a period. The pixel driving period Td and the sensing period Ts may appear alternately. However, it is not limited thereto.

The pixel driving period Td may generate a driving current in the pixel 101. Further, the driving current generated by the pixel 101 is transmitted to a light emitting diode (LED) to emit light, thereby expressing a gray level.

In the pixel driving period Td, the gate signal gs is transmitted to the gate line GL so that the second transistor M2 may be turned on. Also, when the second transistor M2 is turned on, a data signal transmitted to the data line DL may be transmitted to the first node N1. The voltage level of the first node N1 may correspond to the voltage level of the data signal. In addition, the sensing control signal Ssen is transmitted to the sensing control signal line SENSE so that the third transistor M3 may be turned on.

When the second transistor M2 is turned on, a data signal may be transmitted to the second node N2 through the data line DL. When the third transistor M3 is turned on, the first node N1 and the sensing line SL may be connected. In addition, when the first initialization switch RPRE is turned on while the third transistor M3 is turned on, the first initialization voltage VpreR is transmitted to the sensing line SL, so that the first node N1 is first initialized. It can be initialized by the voltage VpreR.

In the pixel driving period Td, the storage capacitor Cst may maintain the voltage level Vata of the data signal at the second node N2. In addition, in response to the voltage of the second node N2, the first transistor M1 may allow a driving current to flow from the first power source EVDD to the second power source EVSS.

In addition, in the sensing period Ts, the gate signal gs is transmitted to the gate line GL so that the second transistor M2 may be turned on. In addition, the sensing control signal Ssen may be transmitted through the sensing control signal line SENSE to turn on the third transistor M3. In addition, the second initialization switch SPRE may be turned on during the sensing period Ts. When the third transistor M3 and the second initialization switch SPRE are turned on, the second initialization voltage VpreS may be transmitted to the first node N1. When the second initialization switch SPRE is turned off while the second and third transistors M2 and M3 are turned on, the voltage of the first node N1 is the current flowing in the first transistor M1. Will rise by

In addition, after a predetermined time elapses after the voltage of the first node N1 increases, the sampling switch SAM connected to the sensing line SL may be turned on. When the sampling switch SAM is turned on, a sensing signal corresponding to the voltage of the first node N1 may be transmitted to the analog digital converter 130a through the sensing line SL. The analog digital converter 130a may convert the sensing signal into first sensing data. The voltage of the first node N1 may be used to determine the threshold voltage of the first transistor M1.

Control of the first initialization switch RPRE, the second initialization switch SPRE, and the sampling switch SAM may be performed by the timing controller 140.

4 is a conceptual diagram illustrating a relationship in which a display panel and a timing controller are connected to a protection circuit in a display device according to the present invention.

Referring to FIG. 4, the display device 100 transmits an electrostatic signal ES from a display panel 110 including an electrostatic sensing circuit 410 for outputting an electrostatic signal corresponding to static electricity, and the electrostatic sensing circuit 410 The protection circuit 420 receiving and outputting the protection signal PS and the display panel 110 receive the first sensing data and perform an update operation of updating the second sensing data, and the protection signal ( PS) may include a timing controller 140 that stops the update operation when it is delivered.

The static electricity sensing circuit 410 may be disposed on the display panel 110 to sense static electricity applied to the display panel 110 and output a static electricity signal ES corresponding to the static electricity. The static electricity signal ES may correspond to the strength of static electricity. In addition, the static electricity sensing circuit 410 may be connected to the protection circuit 420 to transmit the static electricity signal ES to the protection circuit 420.

The protection circuit 420 may output the protection signal PS when the strength of the transmitted static electricity signal ES is greater than or equal to a preset level. In addition, the protection signal PS output from the protection circuit 420 may be transmitted to the timing controller 140. When the protection circuit 420 receives the reset signal RS, the protection circuit 420 is reset so that the protection signal PS may not be output.

When the timing controller 140 receives the protection signal PS, an operation of updating the second sensing data may be stopped. In addition, the timing controller 140 may output the reset signal RS when a preset time elapses after receiving the protection signal PS. The protection circuit 420 may be reset by the reset signal RS output from the timing controller 140, so that the protection signal PS input to the timing controller 140 is until the time when the reset signal RS is output. Can be maintained.

The timing controller 140 may receive an image signal, correct it, and output it. The timing controller 140 may correct the image signal using preset second sensing data. In addition, the timing controller 140 may update the second sensing data by using the first sensing data obtained by converting the sensing signals sensed by the plurality of pixels 101. By updating the second sensing data, the image signal may be corrected in response to a characteristic variation and/or deterioration of the pixel 101. Accordingly, it is possible to prevent image quality deterioration from occurring in the display device 100.

When static electricity is generated, noise may be included in the sensing signal. Since the first sensing data is data obtained by converting the sensing signal, if the second sensing data is updated by the first sensing data, the correction of the image signal performed by the second sensing data may not be accurately performed. For this reason, even if the image signal is corrected, there may be a problem that the image quality of the display device is deteriorated.

In order to solve the above problem, when static electricity occurs, the timing controller 140 does not update the second sensing data based on the first sensing data. If the second sensing data is not updated, the first sensing data corresponding to the sensing signal generated at the time when static electricity is generated in the image signal is not used for updating the second sensing data. Accordingly, the display device 100 may not be deteriorated in image quality due to static electricity.

5 is a structural diagram showing an embodiment of a data driver employed in a display device according to the present invention.

Referring to FIG. 5, the data driver 130 may include an analog-to-digital converter 130a and a digital-to-analog converter 130b.

The data driver 130 may be connected to the timing controller 140 to receive a signal. Also, the analog digital converter 130a of the data driver 130 may receive a sensing signal from the pixel 101 and convert it into a digital signal to output first sensing data.

The digital-to-analog converter 130b of the data driver 130 may convert an image signal received from the timing controller 140 into an analog signal and output a data signal. The analog-to-digital converter 130a may be connected to the sensing line SL, and the digital-to-analog converter 130b may be connected to the data line DL.

Also, the data driver 130 may be one of a plurality of source drivers.

6 is a conceptual diagram illustrating a connection relationship between a display panel, a protection circuit, and a timing controller in a display device according to the present invention.

Referring to FIG. 6, the display panel 110 includes a display substrate, and a wire including a gate line and a data line and a plurality of pixels disposed on the display substrate may be disposed. In addition, the static electricity sensing circuit 410 may include a first wiring 411 disposed outside the display substrate and a second wiring 412 disposed inside the first wiring 411. The first wiring 411 may have a rectangular shape. The second wiring 412 may be disposed parallel to the first wiring 411 on four sides of the display substrate. However, the shapes of the first wiring 411 and the second wiring 412 are not limited thereto. In addition, a ground may be connected to the second wiring 412. Since the second wiring 412 is disposed inside the first wiring 411, even if static electricity is generated, it is possible to prevent the static electricity from being directly transferred to the ground. The pixel 101 shown in FIG. 2 may be disposed inside the second wiring 412.

In addition, the static electricity sensing circuit 410 may include a first capacitor C1 disposed between the first wiring 411 and the second wiring 412. The first electrode of the first capacitor C1 may be connected to the first wiring 411 and the second electrode may be connected to the second wiring 412. The capacitance of the first capacitor C1 may be determined by the interval between the first wiring 411 and the second wiring 412. In addition, the capacitance of the first capacitor C1 may be determined by disposing a separate capacitor element between the first wiring 411 and the second wiring 412.

When static electricity is generated, a voltage due to static electricity may be charged in the first capacitor C1. Since static electricity can be charged in the first capacitor C1, damage to the light emitting display device 100 due to static electricity can be prevented by the static electricity sensing circuit 410. Further, a current flows to the ground by the voltage charged in the first capacitor C1, so that the voltage charged in the first capacitor C1 may be discharged.

In addition, the first wiring 411 and the second wiring 412 may be connected to the protection circuit 420. The protection circuit 420 may output the protection signal PS when the strength of the static electricity signal ES corresponding to static electricity transmitted to the first wiring 411 is greater than or equal to a predetermined level. The strength of the electrostatic signal ES may correspond to the level of the voltage charged in the first capacitor C1.

The protection circuit 420 may include an amplifier circuit 421 and a latch circuit 422. The amplification circuit 421 may amplify the static signal ES to output a sensing signal, and the latch circuit 422 may output a protection signal PS when the intensity of the sensing signal is equal to or higher than a predetermined level. In addition, the latch circuit 422 may receive the reset signal RS from the timing controller 140 and maintain the output of the protection signal PS until it is reset.

The amplifying circuit 421 may include an operational amplifier receiving a reference voltage Vref having a predetermined waveform and an electrostatic signal ES transmitted through the first wiring 411, respectively. The reference voltage Vref is transmitted to the first input terminal of the operational amplifier, and the first wiring 411 may be connected to the second input terminal. The first input terminal of the operational amplifier may be a (-) input terminal and the second input terminal may be a (+) input terminal. A second capacitor C2 may be connected to the second input terminal. The first terminal of the second capacitor C2 may be connected to the second input terminal and the second terminal may be connected to the second wiring 412. The second capacitor C2 may be charged with a voltage between the first wiring 411 and the second wiring 412. Accordingly, an electrostatic signal ES corresponding to a voltage charged between the first wiring 411 and the second wiring 412 may be transmitted to the second input terminal of the operational amplifier.

The amplification circuit 421 may amplify the reference voltage Vref in response to the strength of the static electricity signal ES transmitted through the first wiring 411 and output a detection signal. The latch circuit 422 outputs the protection signal PS when the detection signal is higher than a predetermined level, and does not output the protection signal PS when the detection signal is less than the predetermined level. In addition, the latch circuit 422 may hold the output protection signal PS.

The marking device 100 may include a display panel 110, a source substrate 131, and a control board 141. The display panel 110 may be connected to the source substrate 131 and the first flexible circuit film 132, and the source driver 131a may be disposed on the first flexible circuit film 132. An amplifying circuit 421 and a latch circuit 422 may be disposed on the source substrate 131. Further, a connection wiring 133 connecting the amplifying circuit 421 and the first wiring 411 and the second wiring 412 may be disposed on the first flexible circuit film 132.

Wires that supply signals and/or voltages to the source driver 131a may be disposed on the source substrate 131. In addition, an amplifying circuit 421 and a latch circuit 422 may be disposed on the source substrate 131. The source substrate 131 may be connected to the control board 141 through the second flexible circuit film 134. The second flexible circuit film 134 may connect elements disposed on the control board 141 and wirings of the source substrate 131.

A timing controller 140 may be disposed on the control board 141. In addition, the timing controller 140 may include a memory. However, the present invention is not limited thereto, and a memory may be disposed on the control board 141. The memory may store the second sensing data. Also, the memory may store an image signal. What is stored in the memory is not limited thereto.

7 is a timing diagram illustrating an operation of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the display device 100 may operate by being divided into a driving period Ta and a blank period Tb. The driving period Ta is a period in which the data signals are transmitted to the pixels corresponding to one row of the plurality of pixels, and the blank period Tb may be a period between one driving period and the next driving period. Further, the driving period Ta is a period in which an image signal corresponding to one frame is input, and the blank period Tb may be a period between one frame and the next frame. In addition, the driving period Ta and the blank period Tb may correspond to the display period Td and the sensing period Ts shown in FIG. 3, respectively. The first sensing data may be generated in the blank period Tb.

The protection circuit 420 may output the protection signal PS by the static electricity signal ES generated by the generation of static electricity, and the protection signal PS may be maintained for a predetermined period of time. The protection signal PS may be output and maintained from the latch circuit 422. The latch circuit 422 may be reset when the reset signal RS is transmitted, so that the protection signal PS may be maintained until the latch circuit 422 is reset. Here, the reset signal RS is shown to be transmitted after the three blank periods Tb have elapsed after the protection signal PS is generated, but the present invention is not limited thereto. The timing at which the reset signal RS is output may be determined by the timing controller 140. The timing controller 140 includes a clock and may determine a timing at which the reset signal is output in correspondence with the number of times the vertical synchronization signal is counted from the clock.

The first sensing data generated in the blank period Tb included in the period during which the protection signal PS is maintained is not used to update the second sensing data. While the protection signal PS is maintained, the display device 100 uses the second sensing data by the first sensing data generated in the blank period Tb before the protection signal PS is generated due to the electrostatic signal ES. Can be updated. In addition, the image signal may be corrected by the second sensing data.

8 to 10 are cross-sectional views illustrating arrangements of first and second wirings in the display device according to the present invention.

8 to 10, a semiconductor layer 802 may be disposed on a substrate 801. The semiconductor layer 802 may be a low temperatur polysilicon (LTPS) or an oxide semiconductor. However, it is not limited thereto. In addition, although it is shown that the semiconductor layer 802 is in direct contact with the substrate 801, it is not limited thereto, and a plurality of buffer layers may be disposed between the substrate 801 and the semiconductor layer 802.

A gate insulating layer 803 may be disposed on the semiconductor layer 802. The gate electrode 804 may be disposed on the gate insulating layer 803 at a position overlapping the semiconductor layer 802. The gate electrode 804 may be formed by depositing and patterning a gate metal on the gate insulating layer 803. Further, a first interlayer insulating layer 805 and a second interlayer insulating layer 806 are sequentially stacked on the gate electrode 804, and the source electrode 807a and the drain electrode 807b are sequentially stacked on the second interlayer insulating layer 806. Can be placed. The source electrode 807a and the drain electrode 807b may contact the semiconductor layer 802 through a contact hole.

The first wiring 411 and the second wiring 412 may be disposed on the gate insulating layer 803 as shown in FIG. 8. The first wiring 411 and the second wiring 412 may be disposed on the gate insulating layer 803 when the gate electrode 804 is disposed. Also, the first wiring 411 and the second wiring 412 may include a gate metal like the gate electrode 804.

The first wiring 411 and the second wiring 412 may be disposed on the second interlayer insulating layer 806 as shown in FIG. 9. The first wiring 411 and the second wiring 412 are disposed on the second interlayer insulating layer 806 when the source electrode 807a and the drain electrode 807b are disposed on the second interlayer insulating layer 806. I can. The source electrode 807a and the drain electrode 807b may be formed by depositing and patterning source drain metal on the second interlayer insulating layer 806. In addition, the first wiring 411 and the second wiring 412 may include a source and drain metal, such as the source electrode 807a and the drain electrode 807b.

The first wiring 411 and the second wiring 412 may be arranged in a double layer as shown in FIG. 10. The first wiring 411 and the second wiring 412 are formed on the first metal layer 411a and the second metal layer 412a and the second interlayer insulating layer 806 disposed on the gate insulating layer 803, respectively. A third metal layer 411b and a fourth metal layer 412b may be included. In addition, the third metal layer 411b and the fourth metal layer 412b may be connected to the first metal layer 411a and the second metal layer 412a through vias V1 and V2, respectively. The first metal layer 411a and the second metal layer 412a may include the same material as the gate electrode 804. Also, the third metal layer 411b and the fourth metal layer 412b may include the same material as the source electrode 807a and the drain electrode 807b.

Here, the first wiring 411 and the second wiring 412 are illustrated as being formed on the same layer, but the present invention is not limited thereto, and the first wiring 411 is a gate insulating layer 803 or a second interlayer insulating layer. The second wiring 412 may be disposed on the second interlayer insulating layer 416 or the gate insulating layer 803.

11 is a flowchart illustrating a method of driving a display device according to example embodiments.

Referring to FIG. 11, the display device 100 may generate a data signal using an image signal and display an image on the display panel 110 by the data signal (S1100 ). The image signal is the display panel 110. A data signal may be generated by the corrected image signal and corrected by a preset second sensing signal corresponding to information on pixel characteristics and/or deterioration of each of the plurality of pixels 101 included in FIG. The second sensing data may be stored in the timing controller 140. The number of second sensing data may correspond to the number of pixels 101 disposed on the display panel 110.

The display device 100 may generate first sensing data by receiving a sensing signal obtained by sensing information on pixel characteristics including a threshold voltage and mobility and/or deterioration from a plurality of pixels of the display panel 110. (S1110) The first sensing data may be generated by converting a sensing signal supplied from the analog-to-digital converter 130a connected to the pixel 101. The number of first sensing data may correspond to the number of pixels 101 disposed on the display panel 110. In addition, the second sensing data may be updated by the generated first sensing data.

The update of the second sensing data may include converting and storing the previously stored second sensing data into the received first sensing data. In addition, the updating of the second sensing data may include comparing the first sensing data and the second sensing data, and converting and storing only a portion different from the first sensing data in the second sensing data into the first sensing data. The update of the second sensing data may be performed by the timing controller 140.

The display device 100 may generate an electrostatic signal ES in response to static electricity. (S1120) In addition, the display device 100 determines whether the strength of the generated static electricity signal ES is equal to or higher than a predetermined level. do. The strength of the static electricity signal ES may correspond to the level of a voltage generated by static electricity. The static electricity signal ES may be generated by the static electricity sensing circuit 410 disposed on the display panel 110 of the display device 100. In addition, the static electricity sensing circuit 410 may charge a voltage by static electricity and output a static electricity signal ES corresponding to the charged voltage.

The update of the second sensing data may be stopped. (S1130) If the strength of the electrostatic signal ES is equal to or higher than a predetermined level, the update of the second sensing data using the first sensing data may be stopped. Even if the update of the second sensing data is stopped, the display device 100 may correct the image signal by using the previously stored second sensing data. Accordingly, the first sensing data generated after the update of the second sensing data is stopped is not used for correction of the image signal. That is, when static electricity of more than a predetermined intensity is generated, the display device 100 may stop updating the second sensing data using the first sensing data generated after the static electricity is generated.

The update of the second sensing data may be stopped when a protection signal is output. The static electricity signal ES is transmitted from the static electricity detection circuit 410 disposed on the display panel 110, and the protection signal PS is the static electricity signal ES transmitted from the static electricity detection circuit 410 to the protection circuit 420. ) May be output from the protection circuit 420. The protection circuit 420 may determine the strength of the static electricity signal ES and output the protection signal PS when the strength of the static electricity signal ES is greater than or equal to a predetermined level. The protection signal PS may be maintained for a certain period of time. The protection signal PS may be supplied to the timing controller 140.

When the protection signal PS is output, the update of the second sensing data is stopped, but the image signal may be corrected by the second sensing data that is not updated. Since the second sensing data for correcting the image signal while the protection signal PS is output remains unupdated, the image signal may be corrected by the second sensing data that has not been updated for a certain period of time. Accordingly, when the protection signal PS is supplied, the timing controller 140 does not update the second sensing data and may correct the image signal using the preset second sensing data.

In addition, when a predetermined time elapses after the protection signal PS is output, the output of the protection signal PS may be stopped by the reset signal. When the output of the protection signal PS is stopped, the display device 100 may update the second sensing data by the first sensing data generated after the protection signal PS is stopped. The reset signal RS may be output from the timing controller 140 and supplied to the latch circuit 422. Accordingly, the display device 100 may correct the image signal by using the second sensing data updated by the first sensing data.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. In addition, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to describe the technical spirit of the present invention, and thus the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

100: display device
101: pixel
120: gate driver
130: data driver
140: timing controller
410: static electricity detection circuit
420: protection circuit

Claims (17)

A display panel including a static electricity sensing circuit for outputting a static electricity signal corresponding to static electricity;
A protection circuit for receiving the static electricity signal from the static electricity sensing circuit and outputting a protection signal; And
And a timing controller that performs an update operation of receiving first sensing data from the display panel and updating second sensing data, and stopping the update operation when the protection signal is transmitted from the protection circuit.
The method of claim 1,
The protection circuit outputs the protection signal when the magnitude of the static electricity is greater than or equal to a predetermined value.
The method of claim 1,
The protection circuit includes an amplifying circuit for receiving the static signal and outputting a detection signal, and a latch circuit for receiving the detection signal and outputting the protection signal when the magnitude of the detection signal is greater than or equal to a predetermined value.
The method of claim 3,
The timing controller outputs a reset signal for resetting the latch circuit after a predetermined time elapses after the protection signal is transmitted.
The method of claim 1,
The static electricity sensing circuit,
A display device comprising: a first wire disposed outside the display panel, a second wire disposed inside the first wire and connected to the ground, and a capacitor disposed between the first wire and the second wire.
The method of claim 5,
The display panel includes a plurality of pixels, a data line transmitting a data signal to the plurality of pixels, a gate line transmitting a gate signal to the plurality of pixels, a sensing line receiving sensing signals from the plurality of pixels, and And a sensing control signal line for transmitting a sensing control signal to the plurality of pixels.
The method of claim 3,
The display panel includes a display substrate,
The display substrate is connected to the source substrate through a flexible circuit film,
A source driver for applying a data signal to the display substrate is disposed on the flexible circuit film,
The amplification circuit and the latch circuit connected to the amplification circuit are disposed on the source substrate,
A display device in which a wire connecting the static electricity sensing circuit and the amplifying circuit is disposed on the flexible circuit film.
The method of claim 1,
The timing controller stores the second sensing data, and the timing controller updates the stored second sensing data by using the received first sensing data.
The method of claim 8,
The timing controller corrects an image signal based on the second sensing data.
The method of claim 6,
At least one pixel among the plurality of pixels,
A first transistor for supplying a driving current corresponding to the voltage level of the data signal;
A second transistor for supplying the data signal to the first transistor in response to the gate signal;
The third transistor for transmitting the sensing signal to the sensing line in response to the sensing control signal;
A storage capacitor for maintaining the voltage level of the data signal; And
A display device comprising a light emitting diode emitting light in response to the driving current.
The method of claim 10,
An analog-to-digital converter is connected to the sensing line, and the analog-to-digital converter converts the sensing signal into the first sensing data.
The method of claim 11,
A display device having a source driver connected to the display panel, and the source driver including the analog-to-digital converter.
The method of claim 5,
At least one of the first wiring and the second wiring includes a gate metal.
The method of claim 5,
At least one of the first wiring and the second wiring includes a source drain metal.
A method of driving a display device comprising a display panel having a static electricity sensing circuit disposed thereon, and correcting an image signal in response to static electricity sensed by the static electricity sensing circuit,
Generating a data signal using the image signal and displaying an image on the display panel;
Generating first sensing data by receiving a sensing signal from the display panel;
Generating an electrostatic signal in the electrostatic sensing circuit; And
And stopping updating of the second sensing data using the first sensing data for a predetermined time by the static electricity signal.
The method of claim 15,
In the step of stopping the update of the second sensing data, the display panel corrects the image signal using the second sensing data that has not been updated for the preset time.
The method of claim 15,
A method of driving a display device in which the second sensing data is updated by the first sensing data generated in the step of generating the first sensing data.

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