KR20230062015A - Display panel and controlling method thereof - Google Patents

Abstract

A display device according to an embodiment includes a pixel line, a gate driver for applying a preset voltage to the pixel line, a sensor for detecting an output voltage of the gate driver, and whether or not the gate driver is deteriorated based on the detected output voltage. and a control unit for compensating for the operation of the gate drive when it is determined that the gate driver is deteriorated.

Description

Display device and control method of the display device {DISPLAY PANEL AND CONTROLLING METHOD THEREOF}

The present invention relates to a display device and a method for controlling the display device, and more particularly, to detect whether a gate driver of a display device is degraded using an external sensor, and if a gate driver malfunctioning due to deterioration exists, the gate driver The invention relates to a technology for enabling a gate driver to operate normally by changing an electrical signal input to the driver.

A display device, which is a liquid crystal display device, includes a substrate including a pixel electrode, a substrate including a common electrode, and a liquid crystal layer interposed between the substrates. The display device applies a voltage to the two electrodes to apply an electric field to the liquid crystal layer. By controlling the transmittance of light passing through the liquid crystal layer by controlling the intensity of this electric field and controlling the transmittance of light passing through the liquid crystal layer, the LCD display device that displays colors externally and the electroluminescence phenomenon that emits light when current flows through fluorescent organic compounds There are OLED display devices and the like that display colors externally using self-luminous organic materials that emit light.

Specifically, the display device includes a display display device and a display device driver, and the display device includes a plurality of gate lines and a plurality of data lines. The display device driver includes a gate driver for providing gate signals to the plurality of gate lines and a data driver for providing data voltages to the data lines.

The gate driver includes a gate driving circuit including a plurality of switching elements, and the switching elements may be implemented as thin film transistors.

The gate driver applies a high voltage to the gate electrode of the pull-up switching element of the output terminal by a bootstrap effect. Accordingly, a change in the threshold voltage of the pull-up switching element occurs, power consumption increases due to an increase in leakage current, and an output signal voltage decreases, causing malfunction of the gate driving circuit.

Existing display devices drive a gate driver (or gate driver) line-by-line to drive a matrix of the display device, and the display device is not an external integrated circuit (IC). A gate driver integrated into the device is placed in the bezel of the display device. Therefore, due to mechanical/electrical stress of the display device, a deterioration phenomenon in which a gate driver existing inside the bezel may malfunction, and when the deterioration phenomenon occurs, there is a problem in that pixels of the display device are not normally displayed.

A display device and a method for controlling the display device according to an embodiment are inventions designed to solve the above-described problems, and include a display device for compensating for a gate driver malfunction due to deterioration of a gate driver in a panel of the display device, and It is intended to provide a control method of a display device.

Specifically, a display device and a method for controlling the display device according to an exemplary embodiment detects a shape of an output voltage of a gate driver with a sensor, determines whether the gate driver is malfunctioning based on the detected result, and determines whether the gate driver has deteriorated. An object of the present invention is to provide a display device and a control method of the display device capable of more quickly solving malfunctions of the gate driver by changing an electrical signal input to the gate driver when the gate driver exists.

A display device according to an embodiment includes a pixel line, a gate driver for applying a preset voltage to the pixel line, a sensor for detecting an output voltage of the gate driver, and whether or not the gate driver is deteriorated based on the detected output voltage. and a control unit for compensating for the operation of the gate drive when it is determined that the gate driver is deteriorated.

The control unit may determine whether the gate driver is deteriorated based on whether a waveform of an output voltage of the gate driver deviates from a preset waveform.

The control unit may determine that the gate driver is deteriorated when the magnitude of the output voltage of the gate driver does not change for a preset time.

The control unit may determine that the gate driver is deteriorated when the magnitude of the output voltage of the gate driver is fixed at a specific value for a preset time.

When it is determined that the gate driver is deteriorated, the control unit may compensate for the operation of the gate driver by changing electrical characteristics of a driving clock of the gate driver.

The control unit may change at least one of the amplitude, frequency, period, rising time, falling time, and duty ratio of the driving clock signal to control the gate driver. operation can be compensated.

When the control unit determines that the magnitude of the output voltage of the gate driver is fixed to 0 or that the waveform of the output voltage of the gate driver is output later than a preset waveform, the magnitude of the high signal of the driving clock can increase

The control unit may decrease the level of a low signal of the clock signal when the level of the output voltage of the gate driver is fixed to a specific value other than 0.

The control unit may lower the frequency of the driving clock when it is determined that the gate driver is deteriorated.

The control unit may have a structure independent of the panel of the display device, be located outside the panel of the display device, and be electrically connected to the gate driver and the sensor.

The sensor includes a sequential logic circuit such as a flip-flop.

A display device according to an exemplary embodiment includes a first pixel line and a second pixel line, a first gate driver and a second gate driver applying preset voltages to the first pixel line and the second pixel line, respectively; A sensor detecting the output voltages of the gate driver and the second gate driver and the waveforms of the output voltages of the first gate driver and the second gate driver are compared to determine whether the first gate driver and the second gate driver are degraded. and a control unit that determines and compensates for the operation of the deteriorated gate driver when there is a deteriorated gate driver that has deteriorated.

The sensor may include a combinational logic circuit such as XOR, NOR, or XNOR or an analog circuit such as a comparator.

A display device according to an exemplary embodiment may include applying preset voltages to a first pixel line, a second pixel line, a third pixel line, the first pixel line, the second pixel line, and the third pixel line, respectively. 1 gate driver, the second gate driver and the third gate driver, a first sensor for detecting the output voltages of the first gate driver and the second gate driver, the output voltages of the second gate driver and the third gate driver It is determined whether or not the first gate driver and the second gate driver are deteriorated based on the second sensor and the result detected by the first sensor and the result detected by the second sensor, and When a gate driver exists, a control unit compensating for the operation of the deteriorated gate driver may be included.

The first sensor and the second sensor may include a combinational logic circuit such as an inverter.

A control method of a display device according to an exemplary embodiment includes a method of controlling a display device including a plurality of pixel lines and a plurality of gate drivers, the steps of applying a predetermined voltage to the gate driver, and the gate driver using a sensor. detecting the output voltage of the driver, determining whether there is a deteriorated gate driver among the gate drivers based on the waveform detected by the sensor, and generating a compensation signal if the deteriorated gate driver exists and then inputting the generated compensation signal to the degradation gate drive.

The sensor may include a sequential logic circuit such as a flip-flop, a combinational logic circuit such as an XOR or an inverter, or an analog circuit such as a comparator. .

In the display device according to an exemplary embodiment, when a gate driver in the display device panel malfunctions, it is immediately compensated for, thereby preventing a blackout phenomenon of the display device at an early stage.

Specifically, in the display device according to an exemplary embodiment, when a gate driver malfunctions due to deterioration of a device in the display device itself or a gate driver of the display device due to various stresses such as electrical stress, mechanical stress, and optical stress. , Gate driver malfunction can be compensated for by using an external IC to change the electrical signal input to the gate driver, which has the effect of providing a gate driver that is more resistant to stress.

Accordingly, since the display device according to an exemplary embodiment can easily detect and effectively compensate for the deterioration of the degraded gate driver, mechanical and electrical stresses are high like flexible, foldable, and stretchable display devices. There is an advantage in that the durability of the panel of the received display device can be secured more easily than in the prior art.

In addition, in the display device according to an embodiment, only a sensor is added to the display device, and the role of an external IC can be performed instead by an existing controller, so there is no need for secondary components, and thus the bezel of the display device is reduced. While minimizing the increase in size, there is an advantage of being able to more quickly compensate for malfunction of the gate driver.

1 is a block diagram showing internal components of a display device according to the prior art.
2 is a diagram illustrating a situation in which degradation occurs in a gate driver of a display device.
3 is a diagram illustrating a situation where a blackout occurs in a display device due to deterioration of a gate driver.
4 is a diagram illustrating an internal structure of a display device according to an embodiment of the present invention.
5 is a diagram illustrating a case in which deterioration of a gate driver occurs according to an embodiment of the present invention.
6 and 7 are diagrams illustrating waveforms output when the gate driver output value is normal and when it is not, and sensor output values accordingly.
8 is a diagram illustrating a compensation signal generated when an output of a gate driver is fixed to 0.
9 is a diagram illustrating a compensation signal generated when an output of a gate driver is fixed to 1.
10 is a diagram illustrating a principle of compensating an output signal of a gate drive by changing a frequency.
11 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented by including an XOR sensor.
FIG. 12 is a diagram illustrating waveforms output when the gate driver is normally operated by the sensor of FIG. 11 and when it is not.
13 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented by including a flip-flop.
FIG. 14 is a view illustrating waveforms output when the gate driver is normally operated by the sensor of FIG. 13 and when it is not.
15 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented as an inverter.
FIG. 16 is a diagram illustrating waveforms output by the sensor when the gate driver is normally operated by the sensor of FIG. 15 and when it is not.
17 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented by including an inverter sensor.
FIG. 18 is a diagram illustrating waveforms output when the gate driver is normally operated by the sensor of FIG. 17 and when it is not.
19 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented by including a comparator.
FIG. 20 is a diagram illustrating waveforms output by the sensor when the gate driver is normally operated by the sensor of FIG. 19 and when it is not.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function hinders understanding of the embodiment of the present invention, the detailed description thereof will be omitted. In addition, embodiments of the present invention will be described below, but the technical idea of the present invention is not limited or limited thereto and can be modified and implemented in various ways by those skilled in the art.

In addition, terms used in this specification are used to describe embodiments, and are not intended to limit and/or limit the disclosed invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, terms such as "include", "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or the existence or addition of more other features, numbers, steps, operations, components, parts, or combinations thereof is not excluded in advance.

In addition, throughout the specification, when a part is said to be “connected” to another part, this is not only the case where it is “directly connected”, but also the case where it is “indirectly connected” with another element in the middle. Terms including ordinal numbers, such as "first" and "second" used herein, may be used to describe various components, but the components are not limited by the terms.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention.

1 is a block diagram showing a display device according to the prior art, FIG. 2 is a diagram showing a situation in which a gate driver of the display device is deteriorated, and FIG. 3 is a blackout in the display device due to the deterioration of the gate driver. This is a diagram showing what happened.

Referring to FIG. 1 , a display device panel 10 according to the prior art may include a bezel 20 including a plurality of gate drivers and pixels 30 driven by each gate driver.

The bezel 20 may include a plurality of gate drivers 21 , 22 , 23 , and 24 . Although a total of four gate drivers are shown in FIGS. 1 and 2 due to space limitations, the number of gate drivers included in the display device may increase depending on the size of the display device.

The first gate driver 21 may supply power to the first pixel line 31 , and the second gate driver 22 may supply power to the second pixel line 32 . Accordingly, when N number of gate drivers are included in the display device panel 10, the N number gate driver can supply power to the N number pixel line among a plurality of pixel lines in the pixel. Also, when the gate drivers are normally operated, pulse waves 41 , 42 , 43 , and 44 having constant cycles may be output as the output voltages of the gate drivers, as shown in FIG. 2 .

Meanwhile, in the display device panel 10 , each gate driver included in the bezel 20 of the display device panel 10 may be driven line-by-line to drive a matrix, which is an assembly of pixel lines within a pixel.

As shown in FIG. 2 , when deterioration occurs in the second gate driver 22 among the plurality of gate drivers 21, 22, 23, and 24 included in the bezel 20 of the display device panel 10, Among the plurality of pixel lines 31, 32, 33, and 34, stress is generated in the second pixel line 32 electrically connected to the second gate driver 22, and if this stress continues, the second pixel line 32 The pixel line 32 may become a stress line that does not function normally. In addition, when any one pixel within a plurality of pixels is stressed and does not operate properly, as shown in (a) of FIG. 3, black out and phenomena occur in the N-th pixel line 32. There is a problem with

In addition, when a blackout phenomenon occurs, a display device generally has an active matrix structure and sequentially drives for each channel (line-by-line), so the output of N channel goes into the input of N+1 channel. Have. Therefore, when the gate driver of one channel is deteriorated and does not operate normally, the gate driver of the subsequent channel continues to receive the malfunctioning input signal, resulting in a problem in which normal operation is impossible.

Therefore, when a blackout phenomenon occurs in the second pixel line 32 due to deterioration in the second gate driver 22, as shown in FIG. The screen 41 for the upper pixels operates normally, but the N+1 and N+2 pixel lines below the second pixel line 32 are affected by the second pixel line 32. Therefore, as shown in (b) of FIG. 3 , the screen 42 for pixels below the second pixel line 32 is all blacked out.

Therefore, a display device and a control method of the display device according to an embodiment are inventions designed to solve the above-described problems, and when a deterioration phenomenon that causes a gate driver to malfunction is detected in a display device panel, the degraded gate An object of the present invention is to provide a display device and a control method of the display device capable of solving a malfunction of a gate driver more quickly by changing an electrical signal input to a driver. Find out about the structure and specific features of the present invention through the drawings below.

FIG. 4 is a diagram showing an internal structure of a display device according to an exemplary embodiment, and FIG. 5 is a diagram illustrating a case in which degradation of a gate driver occurs according to an exemplary embodiment. For convenience of description below, in FIG. 5 , it is assumed that the first gate driver 121 and the third gate driver 123 operate normally, but the second gate driver 122 does not operate normally due to deterioration. to explain.

Referring to FIG. 4 , a display device 100 according to an exemplary embodiment may include a display device panel 110 and a controller 160, and the display device panel 110 includes a plurality of gate drivers 121 to 123. and a bezel 120 including a plurality of sensors 131 to 133 and a pixel 140 including a plurality of pixel lines 151 to 143 driven by each gate driver.

Specifically, the bezel 120 according to the present invention senses output voltages of the first gate driver 121, the second gate driver 122, the third gate driver 123, and the first gate driver 121. It may include the first sensor 131, the second sensor 132 for sensing the output voltage of the second gate driver 122, and the third sensor 133 for sensing the output voltage of the third gate driver 123. . In FIG. 4, the number of gate drivers and sensors is limited to three due to space limitations, but the embodiment of the present invention is not limited thereto, and gate drivers may be mounted corresponding to the number of pixels of the display device panel 110. can

In addition, although examples and operating principles of the sensor according to the present invention are specifically described through FIGS. 11 to 20, the embodiment of the present invention is not limited thereto, and a sensor capable of detecting the waveform of the output voltage of the gate driver Any sensor may be included in the sensor of the present invention regardless of its type. For example, various types of logic gates included in digital logic gates may be included therein.

The first sensor 131 may detect the output voltage of the first gate driver 121 and transmit the detected result to the controller 160 . If the first gate driver 121 is normally operated, the waveform 151 of the output voltage of the first gate driver 121 as shown in FIG. 4 is output.

The second sensor 132 and the third sensor 133 can also detect the output voltages of the second gate driver 122 and the third gate driver 123, respectively, and transmit the detected results to the control unit 160. , If the second gate driver 122 and the third gate driver 123 operate normally, as shown in FIG. 4, normal pulse waves 152 and 153 are output.

The controller 160 is a component that controls the overall operation of the display device 100 and may control the operation of a plurality of gate drivers based on results received from sensors present in the display device panel 110 . The control unit 160 according to the present invention is a processor and may be implemented in the form of an integrated circuit (IC), located inside the display device panel 110, or as a structure independent of the display device panel 110. It exists outside the device panel 110 and may be electrically connected to the gate driver and sensors.

The controller 160 may determine whether the gate driver is normally operating based on the results collected from the sensors.

If the gate driver is operating normally, pulse waveforms 151, 152, and 153 are periodically output as the waveforms of the voltages output to the gate drivers, as shown in FIG. Therefore, if the output waveforms of the gate drivers received from the sensors are the same as the pulse waveforms, the control unit 160 determines that all the gate drivers 121, 122, and 123 are operating normally and takes no action.

However, as shown in FIG. 5 , when degradation occurs in the second gate driver 122, the waveform 152 of the voltage output from the second gate driver 122 is Waveforms of a different form from the waveforms (periodically pulsed waveforms 151 and 153) output from the 3-gate driver 123 are output. For example, the output of the second gate driver 122 where deterioration has occurred may output a fixed waveform 152 to 0. In this case, since the second gate driver 122 does not output a normal voltage, normal power is not supplied to the second pixel line 142 connected to the second gate driver 122, resulting in the aforementioned blackout phenomenon. this will happen

Therefore, in this case, the control unit 160 determines that the second gate driver 122 is not operating normally due to deterioration, and generates a compensation signal so that the second gate driver 122 can operate normally. can be sent

Specifically, the control unit 160 may generate a compensation signal based on the output waveform of the second gate driver 122, transmit the generated compensation signal to the first gate driver 121, and transmit the compensation signal to the first gate driver 121. Since the second gate driver 122 received through the gate driver 121 outputs a voltage corresponding to the compensation signal, the second gate driver 122 outputs a voltage close to the normal signal, and accordingly, the second pixel Line 142 can also be operated normally. Hereinafter, based on the result detected by the sensor, the controller 160 determines in detail whether the gate driver is abnormal or not.

6 and 7 are diagrams illustrating a waveform output when the gate driver output value is normal and a case where it is not, and a sensor output value corresponding thereto, and specifically, FIG. 6(b) is a diagram showing the output waveform and the resulting sensor detection result when the output of the gate driver is fixed to 0, and FIG. a) is a diagram showing the output waveform and the resulting sensor detection result when the output of the gate driver is output as a fixed value as a specific value (1), and FIG. It is a diagram showing the output waveform when it is output later than the time and the sensor's detection result accordingly.

Referring to (a) of FIG. 6, if the first gate driver 121 is operating normally, the output voltage is a specific value (1V) in a specific period (t1 to t2) as the output voltage, as shown in the figure. Since this waveform is a normal waveform, the first sensor 131 does not output a special value and outputs the sensing value as 0 in all sections. Therefore, the control unit 160 may determine that the first gate driver 121 is operating normally when the sensing values of the first sensor 131 received by the first sensor 131 are 0 in all sections, , no compensation signal is generated in this case. Throughout this specification, limiting the specific value of the pulse form periodically output by the gate driver to 1V is merely referred to as 1V for convenience of description, and the magnitude of the output voltage when the gate driver operates normally is It may vary depending on the design and manufacturing environment.

Meanwhile, when the first gate driver 121 does not operate normally, it may output a waveform of a different form from when it operates normally. For example, when deterioration occurs in the first gate driver 121 and the output voltage value of the first gate driver 121 is fixed to 0V as shown in FIG. 6(b), the first sensor In (131), since the output value of the first gate driver 121 should exist in a specific period (t1-t2), output information is generated by setting the sensing value to 1 in the period t1-t2, and the generated information It can be transmitted to the control unit 160.

In addition, when the first gate driver 121 is degraded and does not operate normally, the output voltage of the first gate driver 121 may be fixed at 1V and continuously output as shown in FIG. 8(a). there is. In this case, since the voltage is output with a specific value even though it should be output as 0V in the section except for the specific section (t1-t2), the first sensor 131 sets the sensing value having this information as output information and controls the controller 160 can be sent to

Meanwhile, for convenience of description, in (b) of FIG. 6 , it is assumed that when the output value of the first gate driver 121 is continuously fixed to 0, the output value of the first sensor 131 is 1.

In addition, when the first gate driver 121 does not operate normally and the output voltage value of the first gate driver 121 is output later than normal, as shown in (b) of FIG. 8, a specific period In (X1), information indicating that the output voltage is not normally operating may be transmitted to the control unit 160 as output information.

Therefore, when deterioration occurs in the gate driver and the output voltage of the gate driver is not output as shown in FIG. 6 (a), but output as shown in FIG. 6 (b), FIG. , The control unit 160 may determine that the gate driver is not operating normally, generate a compensation signal, and transmit the generated compensation signal to the gate driver. Hereinafter, a method of generating a compensation signal according to various embodiments will be described.

8 to 10 are diagrams illustrating the principle of generating a compensation signal according to an embodiment of the present invention, and in detail, FIG. 8 is a diagram explaining the principle of a compensation signal generated when the output of a gate driver is fixed to 0. 9 is a diagram showing the principle of a compensation signal generated when the output of the gate driver is fixed to 1, and FIG. 10 is a diagram showing the principle of compensating the output signal of the gate driver by changing the frequency.

Referring to (a) of FIG. 8 , if the voltage output from the second gate driver 122 is fixed to 0 due to degradation in the second gate driver 122 in frame (n-1), the voltage should be output. Since the voltage is not output in the (t1-t2) section, the sensing value (Y) output by the second sensor 132 is output as 1 in the (t1-t2) section. Accordingly, in this case, the controller 160 determines that the second gate driver 122 is malfunctioning, and generates a compensation signal and transmits it to the gate driver at frame n, which is a frame following the (n-1) frame.

Specifically, the control unit 160 increases the level of the signal input to the gate driver by increasing the high signal among the output signals of the gate driver driving clock 170 to a higher level (V1 -> V2) than the conventional level in n frames. let it That is, deterioration occurs in the second gate driver 122, and an output voltage cannot be generated with the current input signal. However, if the signal transmitted by the gate drive driving clock 170 is increased, Since the magnitude of the signal input from the 2-gate driver 122 increases, the second gate driver 122 can normally output a voltage.

Therefore, when this compensation signal is input to the second gate driver 122, the waveform of the output voltage of the second gate driver 122 has the same shape as the waveform in the normal state, as shown in FIG. Since the waveform of is output and the waveform of the output voltage of the second gate driver 122 is a waveform in a steady state, all output values of the second sensor 132 are also output as 0.

Conversely, if degradation occurs in the second gate driver 122 in frame (n-1) and the voltage output from the second gate driver 122 is output while being fixed at 1, the second sensor 132 As shown in (a) of FIG. 9, outputs 1 as an ideal value in the interval (t1-t2). Accordingly, in this case, the controller 160 determines that the second gate driver 122 is malfunctioning, and generates a compensation signal and transmits it to the gate driver at frame n, which is a frame following the (n-1) frame.

Specifically, the control unit 160 converts a low signal among output signals of the gate driver driving clock 170 into a signal lower than the conventional signal (V1 -> V2) in frame n to generate a compensation signal, thereby generating a second gate driver In (122), voltage is not output in the section where there should be no voltage output (section except t1-t2). That is, since deterioration occurs in the second gate driver 122 and continues to output voltage even though there is no current input signal, a signal opposite to this is input to the second gate driver 122 to operate the second gate driver ( 122) may not output voltage.

Therefore, when this compensation signal is input to the second gate driver 122, the waveform of the output voltage of the second gate driver 122 is the same as the waveform in the normal state, as shown in FIG. Since the waveform of is output, and then the waveform of the output voltage of the second gate driver 122 is output as a waveform in a steady state, all output values of the second sensor 132 are also output as 0.

In addition, when the second gate driver 122 outputs the output waveform later than the normal waveform, the control unit 160 changes the operating frequency of the second gate driver 122 to prevent malfunction of the gate driver. can compensate Specifically, as shown in FIG. 10, when it is determined that a specific gate driver is malfunctioning due to deterioration in a state in which the gate drivers are operating at the f1 frequency in the (n-1) frame, the pulse waveform in the n frame Malfunctions due to deterioration of the gate driver can be compensated for by lengthening the time of the high signal part (by lowering the operating frequency).

So far, a method for generating a compensation signal by the control unit 160 for each type of malfunction of the gate driver has been described. Hereinafter, various structures of a sensor that can be employed in the present invention will be described for each embodiment.

11 to 20 are diagrams showing configurations for various embodiments of the present invention and output waveforms accordingly, and FIG. 11 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented including an XOR sensor. , FIG. 12 is a diagram illustrating waveforms output by the sensor according to FIG. 11 when the gate driver is normally operated and when it is not.

Referring to FIG. 11, when the sensor of the present invention is implemented including an XOR sensor, even if only one XOR sensor is placed per two gates without the need to connect the sensor to each gate due to the nature of the XOR sensor, two The output waveform for the gate can be sensed.

Specifically, the first sensor 131 may include a first XOR 141 and a first MOSFET (M1) device, and the first XOR 141 may include a first gate driver 121 and a second gate driver 122 ) of the output voltage can be sensed. The second sensor 132 may also include a second XOR 142 and a second MOSFET (M2) device, and the second XOR 142 is a combination of the third gate driver 123 and the fourth gate driver 122. The output voltage can be sensed.

In FIG. 11, the number of gate drivers is limited to 4 and the number of sensors is limited to 2 due to the limitations of the paper, but the embodiment of the present invention is not limited to this and the number of gate drivers may be more, and the number of sensors and gate drivers It may be provided by 1/2 of

If the first gate driver 121 and the second gate driver 122 operate normally, the output waveforms of the first gate driver 121 and the second gate driver 122 will be output as shown in FIG. 12(a). However, if the first gate driver 121 is deteriorated and does not operate normally, the output waveform will not be normally output.

Specifically, when the output voltage of the first gate driver 121 is output as 0, as shown in (b) of FIG. 12, the same result as the normal operating state is output in the period t2-t3, but in the period t1-t2 The value output by the first sensor 131 in will be 0. Accordingly, the control unit 160 can know that the first gate driver 121 is not normally operating and the output voltage is continuously output as 0 through this waveform.

Conversely, when the output voltage of the first gate driver 121 is output as 1, as shown in (c) of FIG. 12, the value output by the first sensor 131 in the period t2-t3 will be 0. , the control unit 160 can know that the first gate driver 121 is not operating normally and the output voltage is continuously output as 1 through this waveform.

In addition, when a phenomenon occurs in which the output of the first gate driver 121 is output later than normal, the waveform output by the first sensor 131 is output as shown in (d) of FIG. 12, Through this waveform, the controller 160 can know that the first gate driver 121 is not normally operating.

Therefore, after generating a compensation signal based on the waveform detected by the first sensor 131 of the controller 160 and transmitting the generated compensation signal to the first gate driver 121, the first gate driver 121 ) can compensate for malfunctions. Since the method for generating the compensation signal has been described above, it will be omitted.

13 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented by including a flip-flop, and FIG. 14 is a diagram showing the sensor according to FIG. 13 when the gate driver operates normally and when it does not. This is a plane showing the waveform output by

Referring to FIG. 13, when the sensor of the present invention is implemented by including a flip-flop, the first sensor 131 may include a first flip-flop 151 and a first MOSFET (M1) element, and the first flip-flop The flop 151 may sense an output voltage of the first gate driver 121 .

The second sensor 132 may include a second flip-flop 152 and a second MOSFET (M2) device, and the second flip-flop 152 may sense an output voltage of the second gate driver 122. .

In FIG. 13, the number of gate drivers is limited to 2 and the number of sensors is limited to 2 due to the limitations of the paper, but the embodiment of the present invention is not limited to this and the number of gate drivers may be more, and the number of sensors and gate drivers The same can be provided as much as.

In addition, the sensors of FIGS. 12 and 13 show an example that can be borrowed from the circuit according to FIG. 12, and the embodiment of the present invention is not limited thereto, and the sensor according to FIG. 12 can apply sequential logic. Any sensor may be included as long as it is a sensor.

If the first gate driver 121 operates normally, the output waveform of the first gate driver 121 will be output as shown in FIG. 14 (a). However, if the first gate driver 121 is deteriorated and does not operate normally, the output waveform will not be normally output.

Specifically, when the output voltage of the first gate driver 121 is output as 0, as shown in (b) of FIG. 14, the value output by the first sensor 131 in all sections will be 0. Through the waveform, the control unit 160 can know that the first gate driver 121 is not normally operating.

Conversely, when the output voltage of the first gate driver 121 is output as 1, the value output by the first sensor 131 in all sections will be 0 as shown in (c) of FIG. Through this, the controller 160 can know that the first gate driver 121 is not normally operating.

In addition, when a phenomenon occurs in which the output of the first gate driver 121 is output later than normal, the waveform output by the first sensor 131 is output as shown in (d) of FIG. 13, Through this waveform, the controller 160 can know that the first gate driver 121 is not normally operating.

Therefore, a compensation signal is generated based on the waveform sensed by the first sensor 131 of the controller 160 and the compensation signal is transmitted to the first gate driver 121, thereby preventing the first gate driver 121 from malfunctioning. can compensate for Since the method for generating the compensation signal has been described above, it will be omitted.

15 is a circuit diagram when the sensor according to the present invention is implemented as an inverter, and FIG. 16 is a waveform output by the sensor according to FIG. 15 when the gate driver is normally operated and when it is not. It is an illustrated drawing.

Referring to FIG. 15, when the sensor of the present invention is implemented by including an inverter sensor, two gates connected in series with the driver are not connected 1:1 to each gate driver due to the characteristics of the inverter sensor. It can be implemented by connecting an inverter sensor.

Specifically, the first sensor 131 corresponding to the inverter is connected to the first gate driver 121 and the second gate driver 122, respectively, so that the first gate driver 121 and the second gate driver 122 The output voltage may be sensed, and the inverter may include a first MOSFET (M1), a second MOSFET (M2), and a third MOSFET (M3). As shown in the figure, the first gate driver 121 includes a second MOSFET (M2). ) may be connected, and a third MOSFET M3 may be connected to the second gate driver 122 .

The second sensor 132 is connected to the second gate driver 122 and the third gate driver 123, respectively, and can sense output voltages of the second gate driver 122 and the third gate driver 123. .

In FIG. 15, the number of gate drivers is limited to three and the number of sensors is limited to two due to the limitations of the paper. It may be provided correspondingly.

If the first gate driver 121 and the second gate driver 122 operate normally, the output waveforms of the first gate driver 121 and the second gate driver 122 will be output as shown in FIG. 15(a). However, if the first gate driver 121 is degraded and does not operate normally, the output waveform of the first gate driver 121 will not be normally output.

Specifically, when the output voltage of the first gate driver 121 is output as 0, as shown in (b) of FIG. 15, the value output by the first sensor 131 in the entire section including the section t1-t2 will be 0, and through this change, the control unit 160 can know that the first gate driver 121 is not operating normally and the output voltage is continuously output as 0.

Conversely, when the output voltage of the first gate driver 121 is output as 1, as shown in (c) of FIG. 11, the value output by the first sensor 131 in the period t2-t3 is a normal value. It doesn't work. Therefore, the control unit 160 can know that the first gate driver 121 is not normally operating and the output voltage is continuously output as 1 through these results.

In addition, when a phenomenon occurs in which the output of the first gate driver 121 is output later than normal, the waveform output by the first sensor 131 returns to normal after time t1 as shown in (d) of FIG. A waveform that is not , will be output for a while, and through this change, the control unit 160 can know that the first gate driver 121 is not operating normally.

Therefore, a compensation signal is generated based on the waveform sensed by the first sensor 131 of the controller 160 and the compensation signal is transmitted to the first gate driver 121, thereby preventing the first gate driver 121 from malfunctioning. can compensate for

Meanwhile, the sensors of FIGS. 15 and 16 show an example that can be borrowed from the circuit according to FIG. 15, and the embodiment of the present invention is not limited thereto, and the sensor according to FIG. 15 can apply combinational logic. Any sensor may be included as long as it is a sensor.

17 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented by including an inverter sensor, and FIG. 18 is output by the sensor according to FIG. 17 when the gate driver operates normally and when it does not. It is a diagram showing the waveform to be.

In the case of the first sensor 131 according to FIG. 17 and the first sensor 131 according to FIG. 15, the operating principle is the same in that the sensors are implemented using an inverter, but as shown in the drawing, the inverter is configured. In this case, there is a difference in that the type of transistor connected to the gate driver is different by changing the arrangement of the transistors.

Specifically, in FIG. 15, the second MOSFET (M2) is connected to the first gate driver 121, and the third MOSFET (M3) is connected to the second gate driver 122, but in FIG. 17, the first gate driver 121 The inverter is implemented in a structure in which the first MOSFET (M1) is connected to and the third MOSFET (M3) is connected to the second gate driver 122.

If the first gate driver 121 and the second gate driver 122 operate normally, the output waveforms of the first gate driver 121 and the second gate driver 122 will be output as shown in FIG. 18(a).

However, if the first gate driver 121 is deteriorated and does not operate normally, the output waveform will not be normally output.

Specifically, when the output voltage of the first gate driver 121 is output as 0, as shown in (b) of FIG. 18, the sensing value is output in the interval t1-t2 where the sensing value should not be output, and the sensing value It can be seen that the sensing value is not output in the period t2-t3 where the output is to be performed. Therefore, the controller 160 can know that the first gate driver 121 is not operating normally and the output voltage is continuously output as 0 based on the sensed value.

Conversely, when the output voltage of the first gate driver 121 is output as 1, as shown in (c) of FIG. 18, the value output by the first sensor 131 in the period t2-t3 is smaller than the normal value. You can see that the value is printed out. Therefore, the control unit 160 can know that the first gate driver 121 is not operating normally and the output voltage is continuously output as 1 through these sensed values.

In addition, when a phenomenon occurs in which the output of the first gate driver 121 is output later than normal, the waveform output by the first sensor 131 is sensed in a certain section as shown in (d) of FIG. It can be seen that the value is not output, but the sensing value is output briefly at t1 and t2. Therefore, the control unit 160 can know that the first gate driver 121 is not normally operating through this waveform.

Therefore, a compensation signal is generated based on the waveform sensed by the first sensor 131 of the controller 160 and the compensation signal is transmitted to the first gate driver 121, thereby preventing the first gate driver 121 from malfunctioning. can compensate for

19 is a diagram showing a circuit diagram when the sensor according to the present invention is implemented by including a comparator, and FIG. 20 is a diagram showing when the gate driver is normally operated and when it is not, by the sensor according to FIG. 19 It is a diagram showing the output waveform.

Referring to FIG. 19, when the sensor of the present invention is implemented including a comparator, even if only one comparator is placed per two gates without the need to connect the sensor to each gate due to the nature of the comparator, The output waveform can be detected.

Specifically, the first sensor 131 may include a first comparator 161 and a first MOSFET (M1) device, and the first comparator 161 may include a first gate driver 121 and a second gate driver 122 ), the second sensor 132 may include a second comparator 162 and a second MOSFET (M2) device, and the second comparator 162 is a third gate driver 123 and the output voltage of the fourth gate driver 124 may be sensed.

In FIG. 19, the number of gate drivers is limited to 4 and the number of sensors is limited to 2 due to the limitations of the paper, but the embodiment of the present invention is not limited to this and the number of gate drivers may be more, and the number of sensors and gate drivers It may be provided by 1/2 of

If the first gate driver 121 and the second gate driver 122 operate normally, the output waveforms of the first gate driver 121 and the second gate driver 122 will be output as shown in FIG. 20(a). However, if the first gate driver 121 is deteriorated and does not operate normally, the output waveform will not be normally output.

Specifically, when the output voltage of the first gate driver 121 is output as 0, as shown in (b) of FIG. 20, the value output by the first sensor 131 in the entire section including the section t1-t2 will be 0, and through this waveform, the control unit 160 can know that the first gate driver is not operating normally and the first gate driver 121 is not operating normally and continues to output an output voltage of 0. .

Conversely, when the output voltage of the first gate driver 121 is output as 1, as shown in (c) of FIG. The result will be output, and through this waveform, the control unit 160 can know that the first gate driver 121 is not operating normally and continues to output only 1 as the output voltage.

In addition, when a phenomenon occurs in which the output of the first gate driver 121 is output later than normal, the waveform output by the first sensor 131 is abnormal in the section t2 as shown in (d) of FIG. Through this change, the control unit 160 can know that the first gate driver 121 is not normally operating.

Therefore, a compensation signal is generated based on the waveform sensed by the first sensor 131 of the controller 160 and the compensation signal is transmitted to the first gate driver 121, thereby preventing the first gate driver 121 from malfunctioning. can compensate for

So far, the display device and the control method of the display device according to the present invention have been looked at in detail through the drawings.

In the display device according to an exemplary embodiment, when a gate driver in the display device panel malfunctions, it is immediately compensated for, thereby preventing a blackout phenomenon of the display device at an early stage.

Specifically, in the display device according to an exemplary embodiment, when a gate driver malfunctions due to deterioration of a device in the display device itself or a gate driver of the display device due to various stresses such as electrical stress, mechanical stress, and optical stress. , Gate driver malfunction can be compensated for by using an external IC to change the electrical signal input to the gate driver, which has the effect of providing a gate driver that is more resistant to stress.

Accordingly, since the display device according to an exemplary embodiment can easily detect and effectively compensate for the deterioration of the degraded gate driver, mechanical and electrical stresses are high like flexible, foldable, and stretchable display devices. There is an advantage in that the durability of the panel of the received display device can be secured more easily than in the prior art.

In addition, in the display device according to an embodiment, only a sensor is added to the display device, and the role of an external IC can be performed instead by an existing controller, so there is no need for secondary components, and thus the bezel of the display device is reduced. While minimizing the increase in size, there is an advantage of being able to more quickly compensate for malfunction of the gate driver.

The devices described above may be implemented as hardware components, software components, and/or a combination of hardware components and software components. For example, devices and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. A processing device may run an operating system (OS) and one or more software applications running on the operating system. A processing device may also access, store, manipulate, process, and generate data in response to execution of software. For convenience of understanding, there are cases in which one processing device is used, but those skilled in the art will understand that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that it can include. For example, a processing device may include a plurality of processors or a processor and a controller. Other processing configurations are also possible, such as parallel processors.

Software may include a computer program, code, instructions, or a combination of one or more of the foregoing, which configures a processing device to operate as desired or processes independently or collectively. You can command the device. Software and/or data may be any tangible machine, component, physical device, virtual equipment, computer storage medium or device, intended to be interpreted by or provide instructions or data to a processing device. can be embodied in Software may be distributed on networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer readable media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program commands recorded on the medium may be specially designed and configured for the embodiment or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler.

As described above, although the embodiments have been described with limited examples and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved. Therefore, other implementations, other embodiments, and equivalents of the claims may fall within the scope of the following claims.

100: display device
110: display device panel
120: bezel
121: first gate driver
122: second gate driver
123: third gate driver
131: first sensor
132: second sensor
133: third sensor
160: control unit

Claims (17)

pixel line;
a gate driver applying a preset voltage to the pixel line;
a sensor detecting an output voltage of the gate driver;
and a controller that determines whether the gate driver is deteriorated based on the detected output voltage, and compensates for the operation of the gate driver when it is determined that the gate driver is deteriorated. According to claim 1,
The control unit,
and determining whether the gate driver is deteriorated based on whether a waveform of an output voltage of the gate driver deviates from a preset waveform. According to claim 1,
The control unit,
and determining that the gate driver is deteriorated when the magnitude of the output voltage of the gate driver does not change for a preset time. According to claim 3,
The control unit,
Wherein the gate driver is determined to be deteriorated when the magnitude of the output voltage of the gate driver is fixed to a specific value. According to claim 1,
The control unit,
Compensating for the operation of the gate driver by changing electrical characteristics of a driving clock of the gate driver when it is determined that the gate driver is deteriorated. According to claim 5,
The control unit,
Compensating for the operation of the gate driver by changing at least one of the amplitude, frequency, period, rising time, falling time, and duty ratio of the driving clock signal. , display device. According to claim 6,
The control unit,
When it is determined that the magnitude of the output voltage of the gate driver is fixed to 0 or that the waveform of the output voltage of the gate driver is output later than a preset waveform, the magnitude of the high signal of the driving clock is increased. display device. According to claim 6,
The control unit,
and reducing the magnitude of a low signal of the clock signal when the magnitude of the output voltage of the gate driver is fixed to a specific value other than 0. According to claim 5,
The control unit,
When it is determined that the gate driver is deteriorated, the frequency of the driving clock is lowered. According to claim 1,
The control unit,
A display device having a structure independent of a panel of the display device, located outside a panel of the display device, and electrically connected to the gate driver and the sensor. According to claim 10,
The sensor,
A display device comprising a sequential logic circuit such as a flip-flop. a first pixel line and a second pixel line;
a first gate driver and a second gate driver respectively applying preset voltages to the first pixel line and the second pixel line;
a sensor detecting output voltages of the first gate driver and the second gate driver;
It is determined whether the first gate driver and the second gate driver are degraded by comparing waveforms of output voltages of the first gate driver and the second gate driver, and if there is a deteriorated gate driver, the deterioration is determined. A display device comprising a control unit that compensates for the operation of the gate drive. According to claim 12,
The sensor,
A display device comprising a combinational logic circuit such as XOR, NOR, or XNOR or an analog circuit such as a comparator. a first pixel line, a second pixel line, and a third pixel line;
a first gate driver, a second gate driver, and a third gate driver respectively applying predetermined voltages to the first pixel line, the second pixel line, and the third pixel line;
a first sensor detecting output voltages of the first gate driver and the second gate driver;
a second sensor for detecting output voltages of the second gate driver and the third gate driver;
Deterioration of the first gate driver and the second gate driver is determined based on the result detected by the first sensor and the result detected by the second sensor, and if a deteriorated gate driver exists and a controller compensating for the operation of the degradation gate drive. According to claim 14,
The first sensor and the second sensor,
A display device comprising a combinational logic circuit such as an inverter. A control method of a display device including a plurality of pixel lines and a plurality of gate drivers,
applying a preset voltage to the gate driver;
a sensor for detecting an output voltage of the gate driver using a sensor;
determining whether there is a deteriorated gate driver among the gate drivers based on the waveform detected by the sensor; and
and generating a compensation signal when the deteriorated gate driver exists, and then inputting the generated compensation signal to the deteriorated gate driver. According to claim 16,
The sensor,
A method for controlling a display device, including a sequential logic circuit such as a flip-flop, a combinational logic circuit such as an XOR, an inverter, or an analog circuit such as a comparator. .

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