KR20170053987A - Display device and driving method having the same - Google Patents

Abstract

The present invention relates to a display apparatus and a driving method thereof. The display apparatus can perform threshold voltage compensation when determining that abnormal driving termination that threshold voltage compensation is not completed in a setting compensation period before starting driving occurs. The display apparatus of the present invention can determine power supply state of an external power source is abnormal when in driving termination, and perform threshold voltage compensation when determining that abnormal driving termination that threshold voltage compensation is not completed in a setting compensation period before starting driving occurs. The display apparatus comprises: a display panel; a system part; a timing controller; and a compensation circuit.

Description

DISPLAY APPARATUS AND DRIVING METHOD THEREOF

The present invention relates to a display apparatus and a driving method thereof.

The electroluminescent device is roughly classified into an inorganic light emitting diode display device and an organic light emitting diode display device depending on the material of the light emitting layer. Particularly, since the organic light emitting diode display device uses a self light emitting device that emits light by itself, This is a great advantage.

The organic light emitting diode display controls the voltage between the gate terminal and the source terminal of the driving transistor to control the current flowing from the drain to the source of the driving transistor.

The current flowing from the drain to the source of the driving transistor flows through the organic light emitting diode and emits light, and the degree of light emission can be controlled by controlling the amount of current.

At this time, the current of the organic light emitting diode is greatly affected by the threshold voltage (Vth) of the driving transistor. Therefore, the organic light emitting diode display device needs to accurately measure the threshold voltage (Vth) of the driving transistor and compensate it. In order to solve this problem, an organic light emitting diode display device is applied with an external compensation method for sensing and compensating a threshold voltage of an organic light emitting diode at a predetermined period from outside. In addition, the organic light emitting diode display compensates the threshold voltage (Vth) at the time of system shutdown in order to compensate the threshold voltage (Vth) at the time of restart after the system is shut down and drive a normal image.

However, according to the related art, the external compensation can not be completed due to forced release of the user's AC power input during the external compensation according to the system shutdown, non-ideal termination of the system due to power failure, and the like. As a result, the organic light emitting diode display device is driven in a state in which the external compensation is not performed until a predetermined period of time in which the external compensation is performed after the start of driving, thereby causing a problem of appearing as a defect.

An object of the present invention is to provide a display device capable of performing external compensation normally even after abnormal termination of a display device.

According to a first aspect of the present invention, there is provided a display device including a display panel having a plurality of drive switches, a system section for outputting a first compensation control signal in a setup compensation period, a first compensation signal generation circuit for generating a first compensation signal based on the first compensation control signal, And a compensating circuit for compensating a threshold voltage of the plurality of driving switches based on the first compensating signal, wherein the system unit performs an abnormal driving termination in which the threshold voltage compensation is not completed in the setting compensating period before the driving start And provides a display device that provides a second compensation control signal to the timing controller when determined. Therefore, even if the system is forcibly terminated by the user during the external compensation of the display apparatus or the system is terminated due to the power failure, the display apparatus can perform the external compensation regardless of the compensation period set at the time of driving.

In the display apparatus according to another embodiment of the present invention, the system unit includes a first control unit for determining whether the abnormal driving is terminated, and the first control unit determines that the abnormal driving operation is terminated if the compensation performing comparison value is greater than the setting compensation period can do.

In the display apparatus according to another embodiment of the present invention, the system unit may output the threshold voltage compensation request message image data to the timing controller when it is determined that the abnormal driving operation is terminated. Therefore, the present invention can arbitrarily perform external compensation of the display device even if the system is forcibly terminated by the user or system shutdown due to power failure during the external compensation of the display device.

In the display device according to another embodiment of the present invention, the system section includes a first memory, and the first memory stores a compensation execution comparison value, a setting compensation period, an image accumulation time of the display device, and a threshold voltage compensation count , The first control unit may calculate a compensation performing comparison value obtained by dividing the image accumulation time by the threshold voltage compensation number.

In the display device according to another embodiment of the present invention, the system further includes a power analysis unit for analyzing the power supply state of the external power supply at the end of driving, And the system unit can determine whether the abnormal driving is terminated if the power supply state of the external power stored after the start of driving is abnormal.

In addition, the present invention provides, as means for solving the above-mentioned problems, a display device having a display panel having a plurality of drive switches, a system part for outputting a first compensation control signal in a setup compensation period and providing driving power to the display panel, And a compensating circuit for compensating a threshold voltage of the plurality of driving switches based on the first compensating signal and the second compensating signal, wherein the timing controller comprises: And provides a second compensation signal to the compensation circuit if it is determined that the abnormal driving operation has not been completed in the setup compensation period. Therefore, the present invention can perform external compensation irrespective of the compensation period set at the time of driving even if the system is forcibly terminated by the user during the external compensation of the display apparatus or the system is terminated due to power failure.

In the display apparatus according to another embodiment of the present invention, the timing controller includes a second control unit for determining whether the abnormal driving has been terminated, and the second control unit indicates that abnormal driving ends when the compensation performing comparison value is greater than the setting compensation period It can be judged.

In the display apparatus according to another embodiment of the present invention, the timing controller may output the threshold voltage compensation request message image data when it is determined that the abnormal driving is ended. Therefore, the present invention can arbitrarily perform external compensation of the display device even if the system is forcibly terminated by the user or system shutdown due to power failure during the external compensation of the display device.

In the display device according to another embodiment of the present invention, the timing controller includes a second memory, and the second memory stores the compensation performing comparison value, the setting compensation period, the image accumulation time of the display device, And the second control unit can calculate the compensation performing comparison value obtained by dividing the image accumulation time by the threshold voltage compensation number.

In the display apparatus according to another embodiment of the present invention, the system unit includes a power analysis unit for analyzing the power supply state of the external power supply at the end of driving, and the second memory includes a power supply And the timing controller can determine whether the abnormal driving is terminated if the power supply state of the external power stored after the start of driving is abnormal.

In addition, the present invention is a display device including a display panel, a system unit, a timing controller, and a compensation circuit as a means for solving the above-mentioned problems, wherein the system controller supplies the first compensation control signal to the timing controller in the system- The step and the timing controller providing the first compensation signal to the compensation circuit based on the first compensation control signal and the compensation circuit performing the threshold voltage compensation of the display panel based on the first compensation signal, Calculating a compensation performance comparison value obtained by dividing the image accumulation time of the system unit by the number of threshold voltage compensations; and calculating a compensation performance comparison value when the compensation value comparison compensation value is larger than the setting compensation period, It is determined that the abnormal driving has been completed, and the system unit determines that the abnormal driving has been completed A timing controller may provide a drive method of a display device including the step of providing a second compensation control signal to output the second compensation signal.

In addition, the present invention provides a display device including a display panel, a system unit, a timing controller, and a compensation circuit as a means for solving the above-mentioned problems, comprising: providing a first compensation control signal to a timing controller in a system- And the timing controller provide the first compensation signal to the compensation circuit based on the first compensation control signal and the compensation circuit perform the threshold voltage compensation of the display panel based on the first compensation signal, Calculating a compensation performing comparison value in which the timing controller divides the image accumulation time by the number of times of threshold voltage compensation; and if the timing controller is larger than the setting compensation period, the threshold voltage compensation is completed in the setting compensation period It is determined that the abnormal driving has been completed and the timing controller ends the abnormal driving If it is determined was a can to provide a method of driving a display device including the step of providing a second compensation signal to the compensation circuit.

According to the present invention, even if the external compensation is not completed due to the forced release of the AC power input of the user during the external compensation according to the system shutdown or the abnormal termination of the system due to the power failure or the like, External compensation can be performed irrespective of the cycle.

Also, even if the abnormal driving is terminated, the user can arbitrarily perform the external compensation of the display device in response to the threshold voltage compensation request.

1 is a block diagram showing a display device according to an embodiment of the present invention.
2 is a diagram illustrating a pixel structure according to an embodiment of the present invention.
3 is a waveform diagram illustrating voltage waveforms on the first and second nodes during threshold voltage sensing.
FIGS. 4 to 6 are diagrams illustrating the operation of the pixel during threshold voltage sensing.
7 is a block diagram for explaining the operation of the compensation circuit according to the embodiment of the present invention.
8 is a block diagram illustrating a system portion and a compensation circuit in accordance with an embodiment of the present invention.
9 is a block diagram illustrating a structure of a system unit according to an embodiment of the present invention.
10 is a flowchart showing a method of driving a display device according to an embodiment of the present invention.
11 is a flowchart showing a driving method of a display apparatus according to another embodiment of the present invention.
12 is a block diagram illustrating a system portion and a compensation circuit in accordance with another embodiment of the present invention.
13 is a block diagram illustrating a structure of a timing controller according to another embodiment of the present invention.

Hereinafter, an organic light emitting diode display device according to an embodiment of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of an apparatus may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to the embodiments disclosed herein but may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification. The dimensions and relative sizes of the layers and regions in the figures may be exaggerated for clarity of illustration.

It will be understood that when an element or layer is referred to as being another element or "on" or "on ", it includes both intervening layers or other elements in the middle, do. On the other hand, when a device is referred to as "directly on" or "directly above ", it does not intervene another device or layer in the middle.

The terms spatially relative, "below," "lower," "above," "upper," and the like, And may be used to easily describe the correlation with other elements or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions.

The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprise "and / or" comprising ", as used in the specification, means that the presence of stated elements, Or additions.

<Block Diagram of Display Device>

1 is a block diagram showing a display device according to an embodiment of the present invention.

1, a display device 100 according to an exemplary embodiment of the present invention includes a system unit 123, a display panel 116, a gate driver 118, a data driver 120, a compensation circuit 130, A controller 124, and the like.

The system unit 123 receives a timing signal including a vertical / horizontal synchronizing signal, a dot clock signal, a data enable signal and the like, digital video data, a power supply voltage Vcc, a compensation control signal CCL, EVS) can be supplied to the timing controller 124. The system unit 123 may incorporate a scaler circuit to adjust the resolution of the digital video data to be supplied to the timing controller 124. The system unit 123 may transmit a timing signal and digital video data to the timing controller 124 through an LVDS (Low Voltage Differential Signaling) interface.

The display panel 116 includes m data lines D1 to Dm, k sensing lines S1 to Sk, n gate lines G1 to Gn, and j And pixels 122 formed in a crossing region of the sensing control lines SC1 to SCj. Signal lines for supplying the first driving power Vdd to the respective pixels 122 and signal lines for supplying the second driving power Vss may be formed on the display panel 116. [ Here, the first driving power supply Vdd and the second driving power supply Vss may be generated from the high potential driving voltage source VDD and the low potential driving voltage source VSS, respectively. The gate driver 118 generates the scan pulse SP in response to the gate control signal GDC from the timing controller 124 and sequentially supplies the scan pulse SP to the gate lines G1 to Gn. The gate driver 118 can also output a control signal SCS controlled from the timing controller 124 and the sensing switch in each pixel can be controlled by the sensing control signal SCS. The gate driver 118 outputs the scan pulse SP and the sensing control signal SCS but the present invention is not limited thereto and may be controlled by the timing controller 124 to output the sensing control signal SCS A separate sensing switch control driver may be provided. The data driver 120 may include a compensation circuit 130. The data driver 120 may be controlled by the timing controller 124 by a data control signal DDC and a compensation control signal CL. That is, the data driver 120 may output the sensing voltage from the timing controller 124 to the data lines D1 to Dm through the data lines and the sensing lines S1 to Sk. Each of the data lines D1 to Dm may be connected to each of the pixels 122 to apply a data voltage to each of the pixels 122. [ Each of the sensing lines S1 to Sk may be connected to the pixel 122 to supply a sensing voltage and measure a sensing voltage on the sensing lines S1 to Sk. Specifically, by supplying the initialization voltage using one sensing line (S1 to Sk), it is possible to detect the sensing voltage using charging and floating with the initialization voltage. The data driver 120 may output or detect the data voltage and the sensing voltage. However, the present invention is not limited to this, and may include a compensation circuit 130 for outputting or detecting the sensing voltage, Circuit 130 may be provided.

<Pixel Structure>

2 is a diagram illustrating a pixel structure according to an embodiment of the present invention.

The pixel 122 described in the present invention may refer to any one of red, green, blue, and white, which may be referred to as a sub-pixel separately. The sub-pixel 122 may include a scan switch SW, a drive switch DR, a sensing switch SEW, an organic light emitting diode OLED, and a storage capacitor Cst. The scan switch SW is controlled by the scan pulse SP on the gate line Gn and supplies data on the data line Dm to the sub pixel 122. The scan switch SW is a transistor for controlling the data line Dm, And may be connected between the node N1. The driving switch DR is a transistor for adjusting a current flowing in the organic light emitting diode OLED by a voltage between a first node N1 and a second node N2 which are gate-source of the driving switch DR, The source terminal may be connected to the second node N2, and the drain terminal may be connected to the first driving power source Vdd. The sensing switch SEW is a transistor for controlling the threshold voltage of the driving switch DR through the initialization and sensing line Sk to the second node N2 and controls the sensing control line SCj May be controlled by a signal SCS and may be connected between the second and third nodes N2 and N3. The anode terminal of the organic light emitting diode OLED may be connected to the second node N2, and the cathode terminal thereof may be connected to the second driving power source Vss. The storage capacitor Cst may be connected between the first and second nodes N1 and N2, that is, between the gate and source terminals of the drive switch DR.

The brightness of the pixel is proportional to the current flowing through the organic light emitting diode OLED as shown in Equation 1 below.

Equation 1

는 구동 스위치(DR)의 이동도 및 기생용량에 의해 결정되는 상수값을 각각 의미한다. 수학식 1과 같이, 유기발광다이오드(OLED)의 전류(Ioled)는 구동 스위치(DR)의 문턱전압(Vth)에 크게 영향 받는다는 것을 알 수 있다. 따라서 전체 영상 이미지의 균일도는 구동 스위치(DR)의 특성 편차, 즉 문턱전압의 편차에 의해 좌우될 수 있다. Here, 'Vgs' is the difference voltage between the gate voltage Vg and the source voltage Vs of the drive switch DR, 'Vdata' is the data voltage, 'Vinit' is the initialization voltage, 'Ioled' Vth 'is the threshold voltage of the drive switch DR,

Quot; means a constant value determined by the mobility and the parasitic capacitance of the drive switch DR. It can be seen that the current Ioled of the organic light emitting diode OLED is greatly affected by the threshold voltage Vth of the driving switch DR, as shown in Equation (1). Therefore, the uniformity of the entire image can be influenced by the characteristic deviation of the drive switch DR, that is, the deviation of the threshold voltage.

Therefore, the present invention can accurately measure and compensate for the threshold voltage (Vth) of the driving transistor as in the following (threshold voltage sensing). The present invention can be applied to an external compensation method for sensing and compensating the threshold voltage of an organic light emitting diode at a predetermined period from outside. Also, the present invention can compensate the threshold voltage (Vth) at the time of system shutdown in order to drive a normal image by compensating the threshold voltage (Vth) at the time of restart after the system is shut down.

In addition, according to the present invention, even if the external compensation is not completed due to the forced release of the AC power input of the user during the external compensation according to the system shutdown or the abnormal operation of the system due to the power failure, External compensation can be performed regardless of the compensation period.

<Threshold Voltage Sensing>

FIG. 3 is a waveform diagram showing voltage waveforms on the first and second nodes during threshold voltage sensing, and FIGS. 4 to 6 are diagrams illustrating the operation of a pixel during threshold voltage sensing.

In other words, FIGS. 3 to 6 illustrate external compensation performed in the set compensation period, external compensation performed when the system is terminated, or external compensation performed after the system is driven.

<Initialization period: t1>

3 and 4, the scan switch SW and the sensing switch SEW are turned on in the initialization period t1 and the sensing voltage Vsen from the data line Dm is applied to the scan switch SW, And the reference voltage Vref from the sensing line Sk is charged to the second node N2 through the sensing switch SEW in response to the initialization control signal Spre . And the storage capacitor Cst is initialized to a voltage difference on the first and second nodes N1 and N2, that is, Vsen-Vref. At this time, the organic light emitting diode OLED does not emit light by the reference voltage Vref supplied to the second node N2 through the sensing switch SEW.

<Source follower driving period: t2>

3 and 5, in the source follower driving period t2, the sensing line Sk is floated, the scan switch SW and the sensing switch SEW are kept turned on, and the storage capacitor CSt is turned on A current flows to the drive switch DR with the high potential power supply Vdd as an energy source by the stored voltage, that is, the voltage Vgs between the gate and source terminals of the drive switch DR. Then, the current flowing through the drive switch DR charges the second node N2, and the voltage on the second node N2 rises. At this time, since the Vgs of the drive switch DR decreases, the current flowing in the drive switch DR also decreases. When Vgs reaches the threshold voltage of the driving switch DR, no current flows to the driving switch DR and the voltage on the second node N2 is kept constant.

<Threshold Voltage Detection Period: t3>

3 and 6, in the threshold voltage detection period t3, the sensing line Sk is electrically connected to the ADC 220 by the Sam signal, detects the voltage on the second node N2, Signal. Then, when the compensated data signal Vd to be supplied to the data line Dm is generated during the characteristics compensation of the driving switch and the organic light emitting diode characteristic sensing period, the threshold voltage Vth of the detected driving switch DR is used The threshold voltage Vth of the drive switch DR can be compensated.

<Internal Structure of Data Driver or Compensation Circuit>

7 is a block diagram for explaining the operation of the compensation circuit according to the embodiment of the present invention.

Referring to FIG. 7, the compensation circuit 130 may perform threshold voltage compensation of a plurality of drive switches based on the compensation signal CL of the timing controller. The compensation signal CL may include an initialization control signal Spre and a sampling signal Sam. The compensation circuit 130 includes a sampling switch SW10 and an initialization switch SW20 for applying a reference voltage Vref, a sensing circuit 131, an analog-to-digital converter (ADC) 132, (133).

The initialization switch SW20 is turned on during the initialization period in response to the initialization control signal Spre to sense the reference voltage Vref supplied from the reference voltage generator 133 to the sensing Can be supplied to the line Sk.

An initialization control signal Spre for controlling the initialization switch SW20 may be provided from the timing controller 124. [

The sampling switch SW10 is turned on by a sampling signal Sam at a high level during threshold voltage sensing so that the sensing circuit 131 can detect the sensing voltage on the sensing lines S1 to Sk. The sampling signal Sam for controlling the sampling switch SW10 may be provided from the timing controller 124. [

On the other hand, the sensing lines S1 to Sk can be floated by the low logic signal of the sampling signal Sam and the low logic signal of the initialization control signal Spre.

The ADC 132 may convert the sensing voltage on the sensing lines S1 to Sk detected by the sensing circuit 240 to a digital value and provide the digital value to the memory 134, Thereby storing information on the threshold voltage of the driving switch DR in the pixel 122. [

The controller 135 provides information on the threshold voltage of the drive switch DR in the pixel 122 stored in the memory 134 to the timing controller 124. The timing controller 124 controls the compensation circuit 130 Can provide the compensated data voltage to the data lines D1 to Dm. Thus, the threshold voltage of the driving switch DR in the pixel 122 can be considered.

The ADC 132 may be separate from the sensing circuit 131 or included in the sensing circuit 131.

&Lt; Embodiment 1 >

FIG. 8 is a block diagram illustrating a system unit and a compensation circuit according to an embodiment of the present invention, and FIG. 9 is a block diagram illustrating a structure of a system unit according to an embodiment of the present invention.

8 and 9, the first embodiment may include a system unit 123, a timing controller 124, and a compensation circuit 130. [

The system unit 123 may include a first memory 210 and a first controller 220. The system unit 123 may output the first compensation control signal CCL to the setup compensation period. The setup compensation period is a period set for compensating the threshold voltage of the display panel 116 at predetermined time intervals. The setting compensation period is set so that there is no abnormality in the image driving or it can be set by the user at will.

In addition, the system unit 123 may provide the second compensation control signal CCL to the timing controller 124 when it is determined that the abnormal driving operation has not been completed in the setup compensation period before starting the driving. That is, the first and second compensation control signals CCL have the same function as the compensation control signal CCL, but are output at different times in the system unit 123. Accordingly, even if the system is forced to terminate or system shutdown due to a power failure during the external compensation of the display apparatus 100, the display apparatus 100 can perform external compensation regardless of the compensation period set at the time of driving.

The system unit 123 may output the threshold voltage compensation request message image data Data to the timing controller 124 when the system controller 123 determines that the abnormal driving operation is terminated. The threshold voltage compensation request message image data is image data to be displayed to the user in a message format when it is determined that the display apparatus 100 has terminated abnormally. More specifically, the threshold voltage compensating request message image data (Data) is compensated for by the threshold voltage compensation during the threshold voltage compensation operation, And the like. In addition, the threshold voltage compensation request message image data (Data) may be data related to an execution message that allows a user to arbitrarily perform threshold voltage compensation when it is determined that the display apparatus 100 has terminated abnormally. The threshold voltage compensation request message image data may be data related to a message that the threshold voltage compensation is simply required to the user if the display device 100 determines that the abnormal driving operation has been completed. Therefore, even if the system is shut down due to the forced termination of the user or the power failure during the external compensation of the display apparatus 100, the user can know that the display apparatus 100 has not performed the external compensation.

The first controller 220 may determine that the abnormal driving operation has been terminated if the compensated comparison value is greater than the set compensation period. The compensated comparison value is a value obtained by dividing the image accumulation time by the number of times of compensating the threshold voltage. The image accumulation time may be the time from the start of driving of the system unit 123 to the end of driving of the system unit 123 and the accumulation time of the system unit 123 according to the present invention, .

If the display apparatus 100 normally performs the threshold voltage compensation for each setting compensation period, the compensation performing comparison value should be the same as the setting compensation period. In addition, when the compensating performance comparison value is smaller than the setting compensation period, the display apparatus 100 performs the threshold voltage compensation more than the setting compensation period, so that a proper current flows through the organic light emitting diode, and the image display is not problematic. However, when the display device 100 stops driving abnormally, the threshold voltage compensation is performed less than the setting compensation period, so that the compensation performing comparison value can be made larger than the setting compensation period. Accordingly, the abnormal driving end can be regarded as a case in which the compensation performing comparison value is larger than the setting compensation period.

The first memory 210 may store a compensation performance comparison value, a setting compensation period, an image accumulation time of the display device, and a threshold voltage compensation frequency.

10 is a flowchart showing a method of driving a display device according to an embodiment of the present invention.

Referring to FIG. 10, the system unit 123 may provide the first compensation control signal CCL to the timing controller 124 in the setup compensation period (S105). The timing controller 124 may provide the first compensation signal CL to the compensation circuit 130 based on the first compensation control signal CCL (S110). The compensation circuit 130 may perform the threshold voltage compensation of the display panel 116 based on the first compensation signal CL (S115). After the driving of the system unit 123 starts, the system unit 123 may calculate a compensated comparison value obtained by dividing the image accumulation time by the threshold voltage compensation count (S120). If the system comparator 123 determines that the compensated comparison value is greater than the set compensation period, it can determine that the abnormal driving operation has not been completed in the set compensation period before the driving of the system unit 123 (S125). The system unit 123 may provide a second compensation control signal for outputting the second compensation signal to the timing controller 124 when it is determined that the abnormal driving operation is terminated so that the compensation circuit 130 may perform the threshold voltage compensation S130). That is, the first and second compensation signals CL have the same function as the compensation signal CL, but differ in timing at which they are outputted from the timing controller 124. [ The system unit 123 may output the threshold voltage compensation request message image data to the timing controller 124 (not shown) if it is determined that the abnormal driving operation is terminated.

Accordingly, the present invention can prevent the external compensation from being completed due to the forced termination of the AC power input of the user, abnormal termination of the system due to power failure, The external compensation can be performed irrespective of the compensation period, and the user can arbitrarily perform the external compensation of the display apparatus 100. [

&Lt; Embodiment 2 >

8 and 9, the second embodiment may include a system unit 123, a timing controller 124, and a compensation circuit 130. [

The system unit 123 of the second embodiment may include the first memory 210 and the first controller 220 as in the first embodiment and may analyze the power supply state (EVS) of the external power supply at the end of driving And a power analysis unit 230 for analyzing the power. The power supply state of the external power supply indicates a state in which the power of the external power supply is normally supplied to the system unit 123. [ In addition, the first memory 210 may store the power supply state of the external power analyzed by the power analysis unit 230.

The difference from the first embodiment is that before the power control unit 230 of the system unit 123 determines that the first control unit 220 of the system unit 123 has completed the abnormal driving, It analyzes the power supply status (EVS) of the power supply. In other words, the second embodiment can determine whether the abnormal operation ends when the power supply state of the external power supply is abnormal when the system unit 123 finishes driving.

Accordingly, even if the abnormal termination of the system is terminated due to the forcible release of the user's external power supply (AC power) or the power failure during the external compensation according to the system shutdown, the display device 100 is not abnormal The external compensation can be performed regardless of the determined and set compensation period.

11 is a flowchart showing a driving method of a display apparatus according to another embodiment of the present invention.

Referring to FIG. 11, the system unit 123 may provide the first compensation control signal CCL to the timing controller 124 in the setup compensation period (S205). The timing controller 124 may provide the first compensation signal CL to the compensation circuit 130 based on the first compensation control signal CCL (S210). The compensation circuit 130 may perform threshold voltage compensation of the display panel 116 based on the first compensation signal CL (S215). Upon termination of the operation of the system unit 123, the system unit 123 may analyze the power supply state of the external power supply (S220). The system unit 123 may store the power supply state of the analyzed external power supply (S225). After the driving of the system unit 123 starts, the system unit 123 may calculate a compensation performance value by dividing the image accumulation time by the threshold voltage compensation count (S230). If the comparison result of the system unit 123 is larger than the set compensation period, the system unit 123 may determine that the abnormal driving operation has not been completed in the setup compensation period before the driving of the system unit 123 (S235). The system unit 123 provides a second compensation control signal CCL for outputting the second compensation signal CL to the timing controller 124 when it is determined that the power supply state of the stored external power supply is abnormal and the abnormal driving is terminated So that the compensation circuit 130 can perform the threshold voltage compensation (S240). That is, the first and second compensation control signals CCL have the same function as the compensation control signals CCL, but are different in output timing from the system unit 123. The first and second compensation signals CL have the same function as the compensation signal CL, but are output at different timings from the timing controller 124. Alternatively, the system unit 123 may output the threshold voltage compensation request message image data (not shown) to the timing controller 124 when it is determined that the power supply state of the stored external power supply is abnormal and the abnormal driving is terminated.

Therefore, even if the abnormal termination of the system is terminated due to the forcible release of the user's external power (AC power) or the blackout during the external compensation according to the system shutdown, the display apparatus 100 can not perform the abnormal termination The external compensation can be performed regardless of the set compensation period, or the user can arbitrarily perform the external compensation of the display device 100. [

FIG. 12 is a block diagram illustrating a system unit and a compensation circuit according to another embodiment of the present invention, and FIG. 13 is a block diagram illustrating a structure of a timing controller according to another embodiment of the present invention.

&Lt; Third Embodiment >

12 and 13, the third embodiment may include a system unit 123, a timing controller 124, and a compensation circuit 130. [

The system unit 123 may output the first compensation control signal CCL to the setup compensation period. In addition, the system unit 123 may provide driving power (Vdd, Vss) to the display panel.

The timing controller 124 may include a second memory 310 and a second controller 320. The timing controller 124 may provide the second compensation signal CL to the compensation circuit 130 when it is determined that the system section 123 has made an abnormal driving end in which the threshold voltage compensation has not been completed in the setup compensation period have. That is, the first and second compensation signals CL have the same function as the compensation signal CL, but differ in timing at which they are outputted from the timing controller 124. [ Therefore, even if the user aborts the abnormal driving of the system due to forced release of the AC power input or power failure during the external compensation of the display apparatus 100, External compensation can be performed irrespective of. If the timing controller 124 determines that the abnormal driving operation has been completed, the timing controller 124 may output the threshold voltage compensation request message image data. Accordingly, even if the abnormal termination of the system is terminated due to the forcible release of the user's external power supply (AC power) or a power failure during the progress of the external compensation according to the system shutdown, It can be seen that it has not been performed.

The second controller 320 may determine that the abnormal driving operation has been terminated if the compensation comparison value is greater than the set compensation period.

The second memory 310 may store a compensated comparison value, a set compensation period, an image accumulation time of the display device, and a threshold voltage compensation count.

10 is a flowchart showing a method of driving a display device according to an embodiment of the present invention.

Referring to FIG. 10, the system unit 123 may provide the first compensation control signal CCL to the timing controller 124 in the setup compensation period (S105). The timing controller 124 may provide the first compensation signal CL to the compensation circuit 130 based on the first compensation control signal CCL (S110). The compensation circuit 130 may perform the threshold voltage compensation of the display panel 116 based on the first compensation signal CL (S115). After the start of the driving of the system unit 123, the timing controller 123 may calculate a compensation performing comparison value obtained by dividing the image accumulation time by the threshold voltage compensation count (S120). If the timing controller 124 determines that the compensated comparison value is larger than the set compensation period, it can determine that the abnormal driving operation has not been completed in the set compensation period before the driving of the system unit 123 (S125). If it is determined that the abnormal driving is completed, the timing controller 124 may provide the second compensation signal CL to the compensation circuit 130 to perform threshold voltage compensation (S130). Alternatively, the timing controller 123 may output the threshold voltage compensation request message image data to the data driver 120 (not shown) if it is determined that the abnormal driving is completed.

Accordingly, even if the user stops the abnormal operation of the system due to the forced release of the AC power input or the power failure during the execution of the external compensation according to the system shutdown, the display device 100 displays the compensation The external compensation can be performed irrespective of the period, or the user can arbitrarily perform the external compensation of the display apparatus 100. [

<Fourth Embodiment>

12 and 13, the fourth embodiment may include a system unit 123, a timing controller 124, and a compensation circuit 130. [

The fourth embodiment may further include a power analysis unit 230 which includes the configuration of the third embodiment and in which the system unit 123 analyzes the power supply state (EVS) of the external power supply at the end of driving. The second memory 310 of the timing controller 124 may store the power supply state (EVS) of the external power analyzed by the power analysis unit 230.

The third embodiment differs from the third embodiment in that when the power analysis unit 230 of the system unit 123 determines that the second control unit 320 of the timing controller 124 has terminated the abnormal driving, It analyzes the power supply status (EVS) of the power supply. That is, the fourth embodiment can determine whether the timing controller 124 has terminated the abnormal driving when the system unit 123 determines that the power supply state of the external power supply is abnormal at the time of termination of the driving.

Therefore, even if the abnormal termination of the system is terminated due to the forcible release of the user's external power supply (AC power) or a power failure during the progress of the external compensation according to the system shutdown, It is possible to perform external compensation regardless of the set compensation period.

11 is a flowchart showing a driving method of a display apparatus according to another embodiment of the present invention.

Referring to FIG. 11, the system unit 123 may provide the first compensation control signal CCL to the timing controller 124 in the setup compensation period (S205). The timing controller 124 may provide the first compensation signal CL to the compensation circuit 130 based on the first compensation control signal CCL (S210). The compensation circuit 130 may perform threshold voltage compensation of the display panel 116 based on the first compensation signal CL (S215). The system unit 123 may analyze the power supply state (EVS) of the external power supply at the end of driving the system unit 123 (S220). The timing controller 124 may store the power supply state (EVS) of the analyzed external power supply (S225). After the start of the driving of the system unit 123, the timing controller 124 may calculate a compensation performing comparison value obtained by dividing the image accumulation time by the threshold voltage compensation count (S230). If the comparison result of the timing controller 124 is larger than the set compensation period, the system controller 123 may determine that the abnormal driving operation has not completed the threshold voltage compensation in the setup compensation period before the driving of the system unit 123 (S235). The timing controller 124 may provide the second compensation signal CL to the compensation circuit 130 to perform the threshold voltage compensation if it is determined that the power supply state (EVS) of the stored external power supply is abnormal and the abnormal driving ends (S240). That is, the first and second compensation signals CL have the same function as the compensation signal CL, but differ in timing at which they are outputted from the timing controller 124. [ Alternatively, the timing controller 123 may output the threshold voltage compensation request message image data to the data driver 120 (not shown) if it is determined that the abnormal driving is completed.

Therefore, even if the abnormal termination of the system due to the forced release of the AC power input of the user during the external compensation according to the system shutdown or the blackout of the system due to the power failure or the like is terminated, The external compensation can be performed regardless of the set compensation period, or the user can arbitrarily perform the external compensation of the display device 100 in response to the threshold voltage compensation request.

Therefore, the present invention can perform the external compensation regardless of the compensation period set at the driving even if the abnormal driving ends at a certain period for performing the threshold voltage compensation, so that the threshold voltage compensation can be performed every predetermined period.

Also, the present invention can perform the external compensation of the display device 100 at random according to the threshold voltage compensation request even if the abnormal driving is terminated at a predetermined period for performing the threshold voltage compensation.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100 display device
116 Display panel
118 gate driver
120 data driver
122 pixels
123 System Department
124 Timing controller
130 Compensation circuit
131 sensing circuit
132 analog digital conversion section
133 Reference voltage generator
134 Memory on Compensation Circuit
135 control unit
210 first memory
220 first control section
230 Power analysis section
310 second memory
320 second control section

Claims (12)

A display panel having a plurality of drive switches;
A system unit for outputting a first compensation control signal in a setup compensation period;
A timing controller for outputting a first compensation signal based on the first compensation control signal and the second compensation control signal; And
And a compensation circuit that performs threshold voltage compensation of the plurality of drive switches based on the first compensation signal,
Wherein the system controller provides the second compensation control signal to the timing controller if it is determined that the abnormal driving operation has not completed the threshold voltage compensation in the setting compensation period before starting the driving. The method according to claim 1,
Wherein the system unit includes a first control unit for determining whether the abnormal driving operation has been completed,
Wherein the first controller determines that the abnormal driving operation is terminated if the compensation execution comparison value is greater than the setting compensation period. The method according to claim 1,
Wherein the system controller outputs the threshold voltage compensation request message image data to the timing controller when it is determined that the abnormal driving operation is completed. 3. The method of claim 2,
The system portion including a first memory,
Wherein the first memory stores the compensation performance comparison value, the setting compensation period, the image accumulation time of the display device, and the threshold voltage compensation count,
Wherein the first control unit calculates the compensation performing comparison value in which the image accumulation time is divided by the threshold voltage compensation number. 5. The method of claim 4,
The system further includes a power analysis unit for analyzing a power supply state of the external power supply at the end of driving,
Wherein the first memory stores a power supply state of the external power analyzed by the power analysis unit,
Wherein the system unit determines whether the abnormal driving operation is terminated if the power supply state of the stored external power supply is abnormal after the start of driving. A display panel having a plurality of drive switches;
A system unit for outputting a first compensation control signal in a setup compensation period and providing driving power to the display panel;
A timing controller for outputting a first compensation signal based on the first compensation control signal; And
And a compensation circuit that performs threshold voltage compensation of the plurality of drive switches based on the first compensation signal and the second compensation signal,
Wherein the timing controller provides the second compensation signal to the compensation circuit if it is determined that the abnormal driving operation has not been completed in the setup compensation period before the system starts driving. The method according to claim 6,
Wherein the timing controller includes a second control unit for determining whether the abnormal driving has ended,
And the second controller determines that the abnormal driving operation is terminated if the compensation performing comparison value is greater than the setting compensation period. The method according to claim 6,
Wherein the timing controller outputs image data of a threshold voltage compensation request message when it is determined that the abnormal driving has ended. 8. The method of claim 7,
Wherein the timing controller includes a second memory,
Wherein the second memory stores the compensation performance comparison value, the setting compensation period, the image accumulation time of the display device, and the threshold voltage compensation frequency,
And the second control unit calculates the compensation performing comparison value obtained by dividing the image accumulation time by the threshold voltage compensation number. 10. The method of claim 9,
Wherein the system unit includes a power analysis unit for analyzing a power supply state of an external power supply at the end of driving,
Wherein the second memory stores the power supply state of the external power analyzed by the power analysis unit,
Wherein the timing controller determines whether the abnormal driving operation is terminated if the power supply state of the stored external power supply is abnormal after the start of driving. A display device including a display panel, a system section, a timing controller, and a compensation circuit,
Providing a first compensation control signal to the timing controller in the system supplemented setup compensation period;
The timing controller providing a first compensation signal to the compensation circuit based on the first compensation control signal;
The compensation circuit performing a threshold voltage compensation of the display panel based on the first compensation signal;
Calculating a compensation performing comparison value in which the system unit divides the image accumulation time by the threshold voltage compensation number after starting the driving of the system unit;
Determining that the abnormal driving operation has not been completed in the set compensation period before starting the driving of the system unit if the compensation value to be performed by the system unit is greater than the setting compensation period; And
And providing a second compensation control signal for outputting a second compensation signal to the timing controller if the system controller determines that the abnormal driving operation has been completed. A display device including a display panel, a system section, a timing controller, and a compensation circuit,
Providing a first compensation control signal to the timing controller in the system supplemented setup compensation period;
The timing controller providing a first compensation signal to the compensation circuit based on the first compensation control signal;
The compensation circuit performing a threshold voltage compensation of the display panel based on the first compensation signal;
Calculating a compensation performing comparison value in which the timing controller divides the image accumulation time by the threshold voltage compensation number after starting the driving of the system unit;
Determining if the timing controller has completed the abnormal driving operation in which the threshold voltage compensation is not completed in the setting compensation period before the start of the driving of the system unit if the compensation performing comparison value is larger than the setting compensation period; And
And providing the second compensation signal to the compensation circuit if the timing controller determines that the abnormal driving operation has been completed.

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