KR102655053B1 - Light emitting display apparatus - Google Patents

Abstract

An object of the present invention is to provide a light-emitting display device in which the period during which a light-emitting device emits light can be controlled for each color of pixels.

Description

Light emitting display device {LIGHT EMITTING DISPLAY APPARATUS}

The present invention relates to a light emitting display device.

When a light emitting display panel using a light emitting device such as a light emitting diode is used for a long time, the driving transistor that supplies current to the light emitting device may deteriorate, and when the driving transistor deteriorates, image quality deteriorates.

In order to compensate for the deterioration of the driving transistor as described above, the pixel driving circuit for controlling the light emitting diode is provided with a plurality of transistors in addition to the driving transistor.

However, despite the compensation, the luminance of the light-emitting elements gradually decreases as the usage time increases, and thus the luminance of the light-emitting display panel gradually decreases.

Additionally, the luminance reduction rate of the light emitting display panel appears differently for each pixel.

For example, the luminance of a pixel representing red decreases faster than the luminance of a pixel representing green and a pixel representing blue.

Therefore, it is difficult to consistently adjust the luminance reduction rates of the pixels using compensation values that are uniformly applied to all of the pixels.

Accordingly, defects such as color change and spotty patterns occur in the light emitting display panel.

The purpose of the present invention proposed to solve the above-mentioned problems is to provide a light-emitting display device in which the period during which the light-emitting element emits light can be controlled for each color of the pixels.

A light-emitting display device according to the present invention for achieving the above-described technical problem includes a light-emitting display panel including pixels including a light-emitting element and a pixel driving circuit that drives the light-emitting element, and the pixel driving circuit is provided to emit the light. It includes an emission signal generator that supplies an emission signal to an emission transistor that controls the current flowing to the device, and a control portion that supplies at least two emission start signals to the emission signal generator. The emission signal generator includes an emission stage that supplies at least two emission signals to horizontal line pixels provided in a row along a scan line provided on the light-emitting display panel. The emission stage includes at least two sub-stages, and at least one of the sub-stages is connected to horizontal line pixels that output the same color.

According to the present invention, since the period during which the light emitting device emits light can be controlled for each color of the pixels, the luminance reduction rate of the pixels can be controlled to be constant.

1 is an exemplary diagram showing the configuration of a light-emitting display device according to the present invention.
Figure 2 is an exemplary diagram showing the configuration of a pixel applied to a light-emitting display device according to the present invention.
Figure 3 is an exemplary diagram showing the configuration of a control unit applied to the light emitting display device according to the present invention.
Figure 4 is an exemplary diagram showing the configuration of a gate driver applied to a light emitting display device according to the present invention.
Figure 5 is an exemplary diagram showing the configuration of a sub-stage applied to a light-emitting display device according to the present invention.
Figure 6 is an example diagram showing waveforms of signals applied to a light-emitting display device according to the present invention.
7 to 11 are exemplary views showing how the organic light emitting display device according to the present invention is driven.
12 and 13 are further exemplary diagrams showing waveforms of signals applied to a display device according to the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. These embodiments only serve to ensure that the disclosure of the present invention is complete, and those skilled in the art It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

In this specification, it should be noted that when adding reference numbers to components in each drawing, the same components are given the same number as much as possible even if they are shown in different drawings.

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

In the case of a description of a temporal relationship, for example, if a temporal relationship is described as 'after', 'successfully after', 'after', 'before', etc., 'immediately' or 'directly' Unless used, non-consecutive cases may also be included.

The term ‘at least one’ should be understood to include all possible combinations from one or more related items. For example, 'at least one of the first item, the second item and the third item' means each of the first item, the second item or the third item, as well as two of the first item, the second item and the third item. It means a combination of all items that can be presented from more than one.

Although first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, various technical interconnections and operations are possible, and each embodiment can be implemented independently of each other or together in a related relationship. It may be possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is an exemplary diagram showing the configuration of a light-emitting display device according to the present invention, Figure 2 is an exemplary diagram showing the configuration of a pixel applied to the light-emitting display device according to the present invention, and Figure 3 is an exemplary diagram showing the configuration of a light-emitting display device according to the present invention. This is an example diagram showing the configuration of the control unit applied to.

As shown in FIGS. 1 and 2, the light emitting display device according to the present invention is provided with pixels 110 including a light emitting element (ED) and a pixel driving circuit (PDC) that drives the light emitting element (ED). a light emitting display panel 100, an emission signal generator that supplies an emission signal (EM) to an emission transistor provided in the pixel driving circuit (PDC) to control the current flowing to the light emitting element (ED); A gate driver 200 including a scan signal generator that supplies a scan signal (SCAN) to the pixel driving circuit (PDC), and a data voltage to the data lines (DL1 to DLd) provided in the light emitting display panel 100. A data driver 300 that supplies (Vdata), a control unit 400 that supplies at least two emission start signals to the emission signal generator, the gate driver 200, the control unit 400, and the data driver ( 300) and includes a power supply unit that supplies power.

Below, the above components are described sequentially.

First, the light-emitting display panel 100 according to the present invention includes a display area 120 provided with pixels 110 including the light-emitting elements (EDs) and the pixel driving circuits (PDCs), and the display area ( It includes a non-display area 130 surrounding 120).

As shown in FIG. 2, the light emitting display panel 100 is provided with pixels 110 including the light emitting element (ED) and a pixel driving circuit (PDC). Additionally, signal lines are formed in the light emitting display panel 100 to define a pixel area where the pixels 110 are formed and to supply driving signals to the pixel driving circuit (PDC).

The light-emitting device ED includes a first electrode, a light-emitting layer provided on the first electrode, and a second electrode provided on the light-emitting layer. The light-emitting layer may include any one of a blue light-emitting part, a green light-emitting part, and a red light-emitting part for emitting light of a color corresponding to the color set in the pixel 110. The light-emitting layer may include any one of an organic light-emitting layer, an inorganic light-emitting layer, and a quantum dot light-emitting layer, or may include a stacked or mixed structure of the organic light-emitting layer (or the inorganic light-emitting layer) and the quantum dot light-emitting layer.

The signal lines include scan lines (GL), data lines (DL), emission lines (EL), initialization lines (IL), first driving power lines (PLA), and second driving power lines ( PLB) and the like.

The scan lines GL are formed parallel to each other at regular intervals along the second direction of the light emitting display panel 100, for example, the horizontal direction.

In the following description, the pixels 110 provided in a row along the scan line GL are referred to as horizontal line pixels. The horizontal line pixels are arranged in a row along the emission line EL.

At least one scan line (GL) may be connected to the pixel driving circuit (PDC). In Figure 2, a pixel driving circuit (PDC) in which two scan lines (GL1 and GL2) are connected is shown as an example of the present invention.

Scan signals (SCAN1, SCAN2) generated by the scan signal generator are supplied to the scan lines (GL1, GL2).

The data lines DL are spaced at regular intervals along the first direction, for example, the vertical direction, of the light emitting display panel 100 to intersect the scan lines GL and the sensing pulse lines SPL. They can be formed side by side. However, the arrangement structure of the data line DL and the scan line GL may be changed in various ways.

The emission signal (EM) generated by the emission signal generator is supplied to the emission line (EL).

At least one of the emission lines (EL) may be connected to the pixel driving circuit (PDC). In Figure 2, a pixel driving circuit (PDC) in which two emission lines (EL1 and EL2) are connected is shown as an example of the present invention.

Emission signals (EM1, EM2) are supplied to the emission lines (EL1, EL2).

The initialization voltage (Vini) generated by the power supply is supplied to the initialization line (IL).

The initialization voltage (Vini) functions to initialize the node connected to the driving transistor or the light emitting element (ED).

The first driving power line (PLA) may be formed at regular intervals parallel to the data line (DL) and the sensing line (SL). The first driving power line (PLA) is connected to the power supply unit and supplies the first driving power (VDD) supplied from the power supply unit to each pixel 110.

The second driving power lines (PLB) supply the second driving power (VSS) supplied from the power supply unit to each pixel 110.

The pixel driving circuit (PDC) includes a driving transistor (Tdr) that controls the current (I) flowing through the light emitting device (ED), the data line (DL), and a space between the driving transistor (Tdr) and the scan line (GL). A first transistor (T1) connected to, a second transistor (T2) and a capacitor (Cst) connected between the driving transistor (Tdr) and the light emitting device (ED) may be provided.

The second transistor T2 is an emission transistor, and the third transistor T3 shown in FIG. 2 is also an emission transistor. That is, the emission timing of the light emitting device ED can be controlled by the second transistor T2 and the third transistor T3.

The emission signal is supplied from the emission signal generator to the second transistor T2, and the scan signal generated from the scan signal generator is supplied to the first transistor T1.

That is, the pixel driving circuit (PDC) may include the first transistor (T1), the driving transistor (Tdr), the second transistor (emission transistor), and the capacitor (Cst), and may use the above components. Thus, the size of the current (I) flowing through the light-emitting device (ED) can be controlled, and the luminance of light output from the light-emitting device (ED) can be controlled according to the size of the current (I).

Additionally, the pixel driving circuit (PDC) provided in each of the pixels 110 may further include transistors for internal compensation.

That is, the pixel driving circuit (PDC) can be changed into various structures to perform internal compensation, and the method of driving the pixel driving circuit (PDC) can also be changed in various ways.

The internal compensation is a method of ensuring that the current (I) transmitted to the light emitting element of the driving transistor (Tdr) formed in the pixel 110 is not affected by the threshold voltage of the driving transistor (Tdr). To this end, the structure and driving method of the pixel can be changed into various forms so that the threshold voltage can be removed from the formula for calculating the current (I).

That is, in FIG. 2, in addition to the driving transistor (Tdr), the first transistor (T1), the second transistor (T2), and the capacitor (Cst), a pixel is provided with third to fifth transistors (T5). A driving circuit (PDC) is shown, and the pixel driving circuit (PDC) can perform the internal compensation.

Hereinafter, a light emitting display device including the pixel driving circuit (PDC) shown in FIG. 2 will be described as an example of the present invention.

The display area 120 of the light emitting display panel 100 refers to a portion where images are output by the pixels 110, and the non-display area 130 refers to a portion where images are not output. The non-display area 130 is provided outside the display area 120.

Second, the gate driver 200 supplies gate signals (SCAN) and emission signals (EM) to the pixel driving circuits (PDC).

The gate driver 200 is provided in the non-display area 130 and can be manufactured together with the pixel driver circuits (PDCs) when manufacturing the pixel driver circuits (PDCs). That is, the gate driver 200 can be directly built into the non-display area 130 of the light emitting display panel 100 using a gate in panel (GIP) method.

However, the gate driver 200 is formed independently from the light-emitting display panel 100 and is connected to the light-emitting display panel through a tape carrier package (TCP), chip-on-film (COF), or flexible printed circuit board (FPCB). It can be connected to (100).

The gate driver 200 is provided in the pixel driving circuit (PDC) and includes an emission transistor that controls the current flowing to the light emitting device (ED), that is, the second transistor (T2) and the third transistor (T3). It includes an emission signal generator that supplies raw emission signals (EM) and a scan signal generator that supplies scan signals (SCAN) to the pixel driving circuit (PDC).

The scan signal generator includes gate stages connected to the scan lines GL provided in the light emitting display panel 100.

The scan signal generator supplies a scan on signal to the scan lines GL provided on the light emitting display panel 100 using the gate control signals GCS transmitted from the control unit 400. The gate control signals (GCS) may include a plurality of gate clocks.

Here, the scan on signal refers to a signal that can turn on the first transistor (T1) (or the fifth transistor (T5)) connected to the scan lines (GL). A signal that can turn off the first transistor (T1) (or the fifth transistor (T5)) is called a scan off signal. The scan on signal and the scan off signal are collectively referred to as scan signals.

The emission signal generator includes an emission stage that supplies at least two emission signals (EM) to horizontal line pixels provided in a row along the scan line (GL) provided in the light-emitting display panel 100. do.

In this case, the emission stage includes at least two sub-stages, and at least one of the sub-stages is connected to horizontal line pixels that output the same color.

The configuration and function of the gate driver 200, particularly the configuration and function of the emission signal generator, will be described in detail below with reference to FIGS. 4 and 5.

Third, the power supply unit supplies power to the gate driver 200, the data driver 300, and the control unit 400.

Fourth, the data driver 300 converts the image data (Data) transmitted from the control unit 400 into data voltages (Vdata), and then converts the data voltages (Vdata) to the data lines (DL1 to DLd). supplied by

Fifth, the control unit 400 uses a timing synchronization signal (TSS) input from an external system to control the operation of the gate driver 200 and the gate control signal (GCS) to drive the data driver 300. Generates a data control signal (DCS) to control each.

In addition, the control unit 400 converts the input image data (Ri, Gi, Bi) input from the external system into image data (Data), and transmits the image data (Data) to the data driver 300. send.

In order to perform the above-described function, the control unit 400 uses the timing synchronization signal (TSS) transmitted from the external system, as shown in FIG. 3, to input image data transmitted from the external system. A data alignment unit 430 for rearranging the images (Ri, Gi, Bi) and supplying the rearranged image data to the data driver 300, and the gate control signal (GCS) using the timing synchronization signal (TSS). and a control signal generator 420 for generating the data control signal (DCS), arranging the timing synchronization signal (TSS) and the input image data (Ri, Gi, Bi) transmitted from the external system. The image data generated by the input unit 410 and the data sorting unit 430 for distributing to the unit 430 and the control signal generating unit 420 and the image data generated by the control signal generating unit 420 It may include an output unit 440 for outputting the control signals (DCS, GCS) to the data driver 300 or the gate driver 200.

Additionally, the control unit 400 may further include a storage unit 450 for storing information on various types of emission start signals to be supplied to the emission signal generation unit. However, the storage unit 450 may be configured independently from the control unit 400.

That is, the gate control signal (GCS) may include gate clocks and a gate start signal used to generate the scan signals, and emission clocks and emission start signals used to generate the emission signals, The storage unit 450 may store information used to generate the emission start signals in various forms.

The function of the emission start signals is described in detail below with reference to FIGS. 4 and 5.

FIG. 4 is an exemplary diagram showing the configuration of a gate driver applied to the light emitting display device according to the present invention, and FIG. 5 is an exemplary diagram showing the configuration of a substage applied to the light emitting display device according to the present invention.

The gate driver 200 includes the emission signal generator 600 and the scan signal generator 500.

The scan signal generator 500 supplies scan signals SCAN1 and SCAN2 to the first transistor T1 and the fifth transistor TP5 provided in the pixel driving circuit PDC. That is, the scan signal generator 500 sequentially supplies scan on signals to the scan lines GL using the gate control signals GCS transmitted from the controller 400.

The scan signal generator 500 includes a plurality of scan stages 510. When one scan stage starts driving by the gate start signal (GVST) transmitted from the control unit 400, the one scan stage receives the gate clock (GCLK) transmitted from the control unit 400. A scan signal (SCAN) is output using at least one of the following.

The scan signal SCAN output from one scan stage is input as a gate start signal to another scan stage, and accordingly, the other scan stage outputs a scan signal SCAN.

By the method described above, the scan stages 510 sequentially generate scan signals (SCAN).

The scan signal generator 500 may be a scan signal generator applied to a general light emitting display device. Accordingly, detailed description of the scan signal generator 500 is omitted.

The emission signal generator 600 is provided in the pixel driving circuit (PDC) and generates the emission through the second transistor (TP2) and the third transistor (T3), which control the emission timing of the light emitting device (ED). Provides emission signals (EM), especially emission-on signals. That is, the second transistor TP2 and the third transistor T3 are the emission transistors.

Here, the emission on signal refers to a signal that can turn on the second transistor (T2) (or the third transistor (T3)) connected to the emission lines (EL). A signal that can turn off the second transistor (T2) (or the third transistor (T3)) is called an emission off signal. The emission on signal and the emission off signal are collectively referred to as an emission signal (EM).

The characteristics of the emission signal generator 600 are as follows.

First, the emission signal generator 600 generates at least two emission signals (EM) to the horizontal line pixels (HLP) provided in a row along the scan line (GL) provided on the light-emitting display panel. It includes an emission stage 610 that supplies.

For example, in Figure 4, an emission signal generator 600 including emission stages 610 that supply three emission signals (EM) to the horizontal line pixels (HLP) is shown as an example of the present invention. It is shown.

However, as explained above, one emission stage 610 can supply two emission signals (EM), or four emission signals (EM) to the horizontal line pixels (HLP). We can also supply. Here, the number of emission signals (EM) may vary depending on the number of colors of pixels 110 provided in the horizontal line pixels (HLP).

Second, the emission stage 610 includes at least two sub-stages 611. In the following description, when an unspecified sub-stage is described, the sub-stage is indicated by reference numeral 611, and the sub-stage corresponding to a specific color or specific pixels is a first sub-stage, a second sub-stage, and a red sub-stage. , can be expressed as a green substage, etc. 4 shows a red sub-stage (Rstage) connected to red pixels (R) among the horizontal line pixels (HLP), and a green sub-stage connected to green pixels (G) among the horizontal line pixels (HLP). An emission stage 610 including a stage (Gstage) and a blue sub-stage (Bstage) connected to blue pixels (B) among the horizontal line pixels (HLP) is shown as an example of the present invention.

However, the luminance reduction rate and lifespan of the red pixels (R) and the green pixels (G) are similar, and the luminance reduction rate and lifespan of the blue pixels (R) are similar to those of the red pixels (R) and the green pixels (G). If the luminance reduction rate and lifespan of the Gs are different, the emission stage 610 is connected to the first sub-stage and the horizontal line pixels (B) among the horizontal line pixels (HLP). HLP) may include a second sub-stage connected to the red pixels (R) and the green pixels (G).

Additionally, as described above, the number of sub-stages 611 may vary depending on the number of colors of the pixels 110 provided in the horizontal line pixels (HLP).

Third, at least one of the sub-stages (Rstage, Gstage, Bstage) is connected to horizontal line pixels that output the same color among the horizontal line pixels (HLP).

For example, the red sub-stage (Rstage) is connected to the red pixels (R) among the horizontal line pixels (HLP), and the green sub-stage (GBstage) is connected to the green pixels (R) among the horizontal line pixels (HLP). It is connected to pixels (G), and the blue sub-stage (Bstage) is connected to blue pixels (B) among the horizontal line pixels (HLP).

Fourth, one of the at least two sub-stages 611 outputs an emission signal including an emission off signal having a first width, and the remaining at least one sub-stage has a first width different from the first width. Outputs an emission signal (EM) including an emission off signal.

For example, the first sub-stage is connected to the blue pixels (B) among the horizontal line pixels (HLP), and the second sub-stage is connected to the red pixels (R) among the horizontal line pixels (HLP). When connected to the green pixels (G), the first sub-stage may output an emission signal (EM) including an emission off signal having a first width, and the second sub-stage may output an emission signal (EM) that is different from the first width, that is, includes an emission off signal that is larger or smaller than the first width.

In this case, the widths of the emission off signals may vary depending on the characteristics of the light emitting elements (EDs) provided in the pixels to which the emission off signals are supplied.

For example, when the lifespan of the light emitting elements (EDs) provided in the blue pixels (B) is shorter than the lifespan of the light emitting elements (EDs) provided in the red pixels (R) and the green pixels (G), By making the width of the emission off signal supplied to the blue pixel (B) longer than the width of the emission off signal supplied to the red pixel (R) and the green pixel (G), the blue pixel (B) The lifespan of the light emitting devices (EDs) provided in the red pixels (R) and the green pixels (G) may be similar to the lifespans of the light emitting devices (EDs) provided in the red pixels (R) and the green pixels (G).

That is, as the light-emitting period of the light-emitting device (ED) becomes longer, the lifespan of the light-emitting device (ED) becomes shorter. Therefore, if the width of the emission off signal supplied to the blue pixels (B) is lengthened, The emission period of the blue pixel (B) may be shortened. Accordingly, the lifespan of the light-emitting devices (EDs) provided in the blue pixels (B) can be similar to the lifespan of the light-emitting devices (EDs) provided in the red pixels (R) and the green pixels (G). there is.

As described above, the width of the emission off signal may vary depending on the characteristics of the light emitting device ED provided in the pixel to which the emission off signal is supplied.

In addition, for example, when the same data voltage is supplied, the luminance of the light emitting elements (ED) provided in the blue pixels (B) is higher than that of the light emitting elements (ED) provided in the red pixel (R) and the green pixel (G). If it is smaller than the luminance of the elements ED, the width of the emission off signal supplied to the blue pixel (B) is equal to the width of the emission off signal supplied to the red pixel (R) and the green pixel (G). By making it shorter, the light emission period of the light emitting elements (ED) provided in the blue pixels (B) is longer than the light emitting period of the light emitting elements (ED) provided in the red pixel (R) and the green pixel (G). It can be long.

That is, as the light-emitting period of the light-emitting device (ED) increases, the luminance of the light-emitting device (ED) may increase, so as described above, the width of the emission off signal supplied to the blue pixels (B) is shorter than the width of the emission off signal supplied to the red pixel (R) and the green pixel (G), so that for the same voltage, the luminance of the blue pixel (R) is equal to that of the red pixel (R) and the green pixel (G). It can be similar to the luminance of pixel (G).

In this case, the width of the emission off signal may change depending on the characteristics of the light emitting device ED provided in the pixel to which the emission off signal is supplied.

Information on the characteristics described above and information on the width of the emission off signal may be stored in the storage unit 450.

However, the widths of the emission off signals output from the at least two sub-stages may all be the same.

That is, considering the above-described characteristics, if the forms of the emission signals output from the sub-stages 611 need to be the same, the emission signals output from the at least two sub-stages 611 The widths of the off signals may all be the same.

Fifth, one of the at least two sub-stages 611 receives a first emission start signal among the emission start signals, and the remaining at least one sub-stage receives the first emission start signal and It is supplied with another emission start signal.

That is, the sub-stages provided in one emission stage 610 may be driven by different emission start signals (EVST) transmitted from the control unit 400.

For example, when the emission stage 610 includes two sub-stages, the control unit 400 sends a first emission start signal and a second emission start signal to the emission generation unit 600. send.

Among the emission stages 610, when the first sub-stage that receives the first emission start signal transmitted from the control unit 400 is driven by the first emission start signal, the first sub-stage is Outputs an emission signal. The emission signal output from the first sub-stage is input as an emission start signal to the first sub-stage provided in another emission stage 610.

Accordingly, the first sub-stage provided in the other emission stage 610 outputs an emission signal.

By the method described above, the first sub-stages provided in the emission stages 610 sequentially output emission signals.

Among the emission stages 610, when the second sub-stage that receives the second emission start signal transmitted from the control unit 400 is driven by the second emission start signal, the second sub-stage Outputs an emission signal. The emission signal output from the second sub-stage is input as an emission start signal to the second sub-stage provided in another emission stage 610.

Accordingly, the second sub-stage provided in the other emission stage 610 outputs an emission signal.

By the method described above, the second sub-stages provided in the emission stages 610 can also sequentially output emission signals.

That is, the emission off signals output from the sub-stages have the same form as the emission start signals. For example, the emission signal output from the first sub-stage to which the first emission start signal is supplied is the same as the form of the first emission start signal, and the second emission signal to which the second emission start signal is supplied is the same as the form of the first emission start signal. The emission signal output from the sub-stage has the same form as the second emission start signal.

Therefore, as described above, in order for emission off signals having different widths to be output from the sub-stages 611, the emission signal supplied from the control unit 400 to the emission signal generating unit 600 The emission start signals must be different.

In this case, the first emission start signal and the second emission start signal may include different types of emission off signals, but may also include the same type of emission off signals.

That is, considering the above-described characteristics, if the forms of the emission signals output from the sub-stages 611 need to be the same, the first emission start signal and the second emission start signal may have the same form.

In the following description, when an unspecified emission start signal is described, the sub-emission start signal is indicated by reference numeral EVST, and the emission start signal corresponding to a specific color or specific sub-stage is the first emission start signal. It can be expressed as a signal, a second emission start signal, a red emission start signal, a green emission start signal, etc.

Sixth, when a preset period elapses, the control unit 400 may change the waveforms of the at least two emission start signals (EVST).

In particular, when a preset period elapses, the control unit 400 may reduce the width of the emission off signals constituting the at least two emission start signals.

For example, the luminance of the light emitting elements (ED) constituting the pixels 110 decreases as the light emitting display device is continuously used.

Therefore, in order to compensate for the reduced luminance, the period during which the light-emitting element ED emits light must be increased, which means that the period during which the light-emitting element ED does not emit light is reduced.

The light emitting device does not emit light due to the emission off signal. Accordingly, when the width of the emission off signal is reduced, the period during which the light emitting device does not emit light can be reduced.

Accordingly, when a preset period elapses, the control unit 400 may reduce the width of the emission off signals constituting the at least two emission start signals.

In this case, the degree to which the width of the emission off signals is reduced and the period of time to reduce the width may vary depending on the characteristics of the light emitting elements (EDs) provided in the pixels to which the emission off signals are supplied. . Information on the degree to which the width of the emission off signals is reduced and the period for which the width is reduced may be stored in the storage unit 450.

In the following description, a light emitting display device in which the emission stages 610 are configured as shown in FIG. 4 will be described as an example of the present invention. Accordingly, the contents described above for the emission stages 610 shown in FIG. 4 are summarized as follows.

First, the emission signal generator 600 generates at least two emission signals (EM) to the horizontal line pixels (HLP) provided in a row along the scan line (GL) provided on the light emitting display panel 100. ) and an emission stage 610 that supplies them.

In this case, the emission stage 610 includes at least two sub-stages 611, and at least one of the sub-stages 611 is a horizontal line outputting the same color among the horizontal line pixels (HLP). It is connected to line pixels.

For example, as shown in FIG. 4, the horizontal line pixels (HLP) are first color pixels that output a first color (e.g., red (R)) and a second color (e.g., For example, it may include second color pixels that output green (G) and third color pixels that output a third color (eg, blue (B)).

In this case, the emission stage 610 includes a first sub-stage (Rstage) connected to the first color pixels (R), and a second sub-stage connected to the second color pixels (G). (Gstage) and a third sub-stage (Bstage) connected to the third color pixels (B).

Second, one of the at least two sub-stages 611 outputs an emission signal (EM) including an emission off signal having a first width, and the remaining at least one sub-stage outputs the first width. Outputs an emission signal (EM) including an emission off signal that is different from the width.

For example, the first substage (Rstage) outputs a first emission signal including an emission off signal having a first width, and the second substage (Gstage) outputs a first emission signal different from the first width. Outputs a second emission signal including an emission off signal having a width of 2, and the third substage (Bstage) outputs an emission off signal having a third width different from the first width and the second width. A third emission signal including:

Third, one of the at least two sub-stages 611 receives a first emission start signal among the emission start signals (EVST), and the remaining at least one sub-stage receives the first emission start signal. An emission start signal that is different from the start signal is supplied.

For example, the first sub-stage (Rstage) receives the first emission start signal from the control unit 400, and the second sub-stage (Gstage) receives the first emission start signal from the control unit 400. A second emission start signal that is different from the first emission start signal may be supplied, and the third sub-stage (Bstage) may be supplied with a third emission start signal that is different from the first and second emission start signals.

That the first to third emission start signals are different means that the widths of pulses forming the first to third emission start signals are different. Here, the pulse is a signal corresponding to the emission off signal.

Fourth, when a preset period elapses, the control unit 400 may change the waveforms of the at least two emission start signals (EVST).

In particular, the control unit 400 can reduce the widths of the emission off signals.

For example, when a preset period elapses, the control unit 400 changes the width of the emission off signal constituting the emission start signal supplied to the first substage (Rstage), and the second substage The width of the emission off signal constituting the emission start signal supplied to the (Gstage) can be changed, and the width of the emission off signal constituting the emission start signal supplied to the third substage (Bstage) can be changed. there is.

Figure 5 is an exemplary diagram showing the configuration of a stage applied to a light emitting display panel according to the present invention. In the following description, content that is the same or similar to that described with reference to FIGS. 1 to 4 is omitted or simply described.

As described above, the light emitting display device according to the present invention includes the gate driver 200, wherein the gate driver 200 drives the emission line (EL) provided in the light emitting display panel 100. It includes emission stages 210 connected to each other, and each of the emission stages 610 includes at least two sub-stages 611.

Each of the sub-stages 611 supplies an emission signal (EM) to the pixels 110 connected to it among the horizontal line pixels (HLP).

To this end, as shown in FIG. 5, each of the sub-stages 611 includes an emission-on transistor ( TR7), an emission-off transistor (TR8_a) and an on-off signal generator 612 for outputting the emission-off signal during a period of one frame in which one image is output, excluding the period in which the emission-on signal is output ) includes.

When the second transistor T2 connected to the sub-stage 611 is to be turned on, the on-off signal generator 612 operates at the gate of the emission-on transistor TR7, that is, the Q node (Q). A turn-on control signal for turning on the emission-on transistor (TR7) is transmitted, and when the second transistor (T2) is to be turned off, the gate of the emission-off transistor (TR8_a), that is, the QB node ( A turn-off control signal that turns on the emission-off transistor (TR8_a) is transmitted to QB).

To this end, as shown in FIG. 5, the on-off signal generator 612 includes first to sixth transistors (TR1 to TR6), an eighth transistor (TR8), and three capacitors (C1 to C3). ) may include.

For example, when the first transistor TR1 is turned on by the emission clock ECLK supplied from the control unit 400 shown in FIG. 5, the emission start signal EVST is transmitted to the first transistor ( It is supplied to the Q node (Q) through TR1) and the sixth transistor (TR6), and accordingly, the emission-on transistor (TR7) is turned on.

When the emission-on transistor (TR7) is turned on, the first voltage (e.g., a high voltage capable of turning on the emission transistor (second transistor) T2) (VEH) is used as the emission-on signal. It is output through the emission line (EL).

In this case, a voltage (VEL) different from the first voltage (e.g., a low voltage capable of turning off the emission transistor (second transistor) T2) (VEL) is transmitted to the QB node through the fourth transistor (TR4). (QB), and accordingly, the emission off transistor (TR8_a) is turned off.

Thereafter, when the emission-on transistor (TR7) is turned off, the emission-off transistor (TR8_a) is turned on, and accordingly, the second voltage (VEL) is applied to the emission line (EL) as the emission-off signal. ) is output through.

That is, the emission on transistor TR7 outputs the first voltage VEH at a high level as the emission on signal only when the emission start signal EVST is at a high level, and the emission start signal When (EVST) is at a low level, the second voltage VEL at a low level is output as the emission off signal through the emission off transistor TR8_a.

Accordingly, the emission signal EM output to the emission line EL has the same form as the emission start signal EVST. Accordingly, the emission start signal transmitted from the control unit 400 to the emission signal generator 600 also has the same signal as the emission signals EM.

That is, when the waveform of the emission start signal (EVST) changes, the waveform of the emission signal (EM) may change. In particular, among the emission start signals (EVST), the waveform corresponding to the emission off signal If the width of the portion changes, the width of the emission off signal may also change.

Since the feature of the present invention is not in the configuration of the sub-stage 611 shown in FIG. 5, detailed description of the sub-stage 611 is omitted.

In addition, the configuration of the on-off signal generator 612 shown in FIG. 5 is presented as an example of the present invention in order to explain the overall configuration of the sub-stage 611 applied to the present invention.

That is, the configuration of the on-off signal generator 612 and the sub-stage 611 including the on-off signal generator 612 is not limited to the form shown in FIG. 5, and therefore, the sub stage 611 includes the on-off signal generator 612. The stage 611 may be configured in various forms other than those shown in FIG. 5.

Hereinafter, a method of driving a light emitting display device according to the present invention will be briefly described with reference to FIGS. 6 to 9. In the following description, content that is the same or similar to that described with reference to FIGS. 1 to 5 is omitted or simply described.

FIG. 6 is an exemplary diagram showing waveforms of signals applied to a light emitting display device according to the present invention, FIGS. 7 to 11 are exemplary diagrams showing how the organic light emitting display device according to the present invention is driven, and FIGS. 12 and FIG. 13 is another example diagram showing waveforms of signals applied to the display device according to the present invention.

First, in the first period (A), as shown in FIGS. 6 and 7, the high-level first scan signal (SCAN1) is transmitted to the fourth transistor (T4) and the fifth transistor (T4) of the pixel driving circuit (PDC). is supplied to the transistor T5, the low-level second scan signal SCAN2 is supplied to the first transistor T1, and the low-level first emission signal EM1 is supplied to the second transistor T2. and a high-level second emission signal (EM2) is supplied to the third transistor (T3).

Therefore, as shown in FIG. 7, the first transistor T1 and the second transistor T2 are turned off, and the third transistor T3, the fourth transistor T4, and the fifth transistor are turned off. (T3) is turned on.

In this case, the first driving power (VDD) and the initialization voltage (Vini) are supplied to the capacitor (Cst), and accordingly, the driving transistor (Tdr) and the capacitor (Cst) are initialized.

In particular, the driving power (VDD) is applied to one end of the capacitor (Cst), that is, the gate of the driving transistor (Tdr).

The initialization voltage Vini is applied to the other end of the capacitor Cst, that is, the source of the driving transistor Tdr.

In addition, since the initialization voltage (Vini) is also supplied to the light-emitting device (ED), the light-emitting device (ED) is initialized by the initialization voltage (Vini).

Next, in the second period (B), as shown in FIGS. 6 and 8, the high-level first scan signal (SCAN1) is transmitted to the fourth transistor (T4) and the fifth transistor (T4) of the pixel driving circuit (PDC). is supplied to the transistor T5, the high level second scan signal SCAN2 is supplied to the first transistor T1, and the low level first emission signal EM1 is supplied to the second transistor T2. and the low-level second emission signal EM2 is supplied to the third transistor T3.

Therefore, as shown in FIG. 8, the second transistor T2 and the third transistor T3 are turned off, and the first transistor T1, the fourth transistor T4, and the fifth transistor are turned off. (T5) is turned on.

In this case, the data voltage (Vdata) supplied through the data line (DL) and the threshold voltage of the driving transistor (Tdr) are charged in the capacitor (Cst). In particular, the data voltage (Vdata) and the threshold voltage are applied to one end of the capacitor (Cst), that is, to the gate of the driving transistor (Tdr).

Next, in the third period (C), as shown in FIGS. 6 and 9, the low-level first scan signal (SCAN1) is transmitted to the fourth transistor (T4) and the fifth transistor (T4) of the pixel driving circuit (PDC). is supplied to the transistor T5, the high level second scan signal SCAN2 is supplied to the first transistor T1, and the low level first emission signal EM1 is supplied to the second transistor T2. and the low-level second emission signal EM2 is supplied to the third transistor T3.

Therefore, as shown in FIG. 9, only the first transistor T1 is turned on, and the second to fifth transistors T2, T3, T4, and T5 are turned off.

In this case, the capacitor Cst is charged with the data voltage Vdata supplied in the second period B and the threshold voltage of the driving transistor Tdr.

Next, in the fourth period (D), as shown in FIGS. 6 and 10, the low-level first scan signal (SCAN1) is transmitted to the fourth transistor (T4) and the fifth transistor (T4) of the pixel driving circuit (PDC). is supplied to the transistor T5, the low level second scan signal SCAN2 is supplied to the first transistor T1, and the high level first emission signal EM1 is supplied to the second transistor T2. and the low-level second emission signal EM2 is supplied to the third transistor T3.

Therefore, as shown in FIG. 10, only the second transistor T2 is turned on, and the first transistor T1 and the third to fifth transistors T3, T4, and T5 are turned off.

In this case, since the second transistor T2 is turned on but the third transistor T3 is turned off, no current flows through the light emitting device ED, and therefore, the light emitting device ED outputs light. can not do.

In this case, the capacitor Cst is charged with the data voltage Vdata supplied in the second period B and the threshold voltage of the driving transistor Tdr.

Finally, in the fifth period (E), as shown in FIGS. 6 and 11, the low-level first scan signal (SCAN1) is transmitted to the fourth transistor (T4) and the first scan signal (SCAN1) of the pixel driving circuit (PDC). 5 is supplied to the transistor T5, the low level second scan signal SCAN2 is supplied to the first transistor T1, and the high level first emission signal EM1 is supplied to the second transistor T2. and the high-level second emission signal EM2 is supplied to the third transistor T3.

Therefore, as shown in FIG. 11, the second transistor T2 and the third transistor T3 are turned on, and the first transistor T1, the fourth transistor T4, and the fifth transistor ( T5) is turned off.

In this case, the driving transistor (Tdr) is turned on by the data voltage (Vdata) charged in the capacitor (Cst).

Accordingly, the current I flows to the light emitting device ED through the third transistor T3, the driving transistor Tdr, and the second transistor T2, and accordingly, the light emitting device ED Light with luminance corresponding to the data voltage (Vdata) is output.

In addition, from after the fifth period (E) until the first period (A) arrives again, the same signals as the fifth period (E), that is, the low level first scan signal (SCAN1) , the low-level second scan signal (SCAN2), the high-level first emission signal (EM1), and the high-level second emission signal (EM2) are continuously supplied to the pixel driving circuit (PDC). do.

Accordingly, the light emitting device (ED) can continuously output light having a luminance corresponding to the data voltage (Vdata) from after the fifth period (E) until the first period (A) arrives again. there is.

In the fifth period (E), the voltage of the gate of the driving transistor (Tdr) is the voltage of the first terminal of the capacitor (Cst), that is, the data voltage (Vdata) and the threshold voltage of the driving transistor (Tdr) is the sum of , and the voltage of the source of the driving transistor (Tdr) is the voltage of the second terminal of the capacitor (Cst), that is, the initialization voltage (Vini).

Therefore, the differential voltage (Vgs) between the gate and source of the driving transistor (Tdr) is the sum of the data voltage (Vdata) and the threshold voltage minus the initialization voltage (Vini) (= Vdata + Vth - Vini) am.

In this case, the current (I) passing through the driving transistor (Tdr) and supplied to the light emitting device (ED) is equal to the difference voltage (Vgs) between the gate and source of the driving transistor (Tdr) (= Vdata + Vth - Vini) It is proportional to the square of the voltage (= [Vdata + Vth - Vini] - Vth = Vdata - Vini) minus the threshold voltage (Vth) of the driving transistor (Tdr).

Therefore, the current (I) supplied to the light emitting device (ED) through the driving transistor (Tdr) can be expressed as [Equation 1] below.

In [Equation 1], k is a proportionality constant determined by various factors.

That is, the current (I) supplied to the light emitting element (ED) through the driving transistor (Tdr) is determined by the data voltage (Vdata) and the initialization voltage (Vini), and the threshold of the driving transistor (Tdr) is determined by the data voltage (Vdata) and the initialization voltage (Vini). It is not determined by voltage (Vth).

In general, the driving transistor (Tdr) may deteriorate as the organic light emitting display device is used for a long time, and accordingly, the threshold voltage (Vth) of the driving transistor (Tdr) may change.

In this case, the degree of deterioration of the driving transistor Tdr provided in the pixel 110 formed in the light emitting display panel 100 may vary due to various causes.

If the degree of deterioration of the driving transistors (Tdr) varies, the threshold voltages of the driving transistors (Tdr) also change.

When the threshold voltages of the driving transistors (Tdr) are different, even if the same data voltages (Vdata) are supplied to the driving transistors (Tdr), the size of the current supplied to the light emitting elements (ED) through the driving transistors (Tdr) may be different. Accordingly, the light emitting elements (ED) provided in pixels supplied with the same data voltage (Vdata) may output light of different luminance.

However, in the present invention, the current I flowing through the light emitting device ED during the fifth period, that is, the timing when the light emitting device ED emits light, is not affected by the threshold voltage Vth.

That is, in the present invention, as described in [Equation 1], the threshold voltage (Vth) can be deleted from the calculation equation for calculating the current (I) flowing through the light emitting element (ED), and thus, the light emission The current (I) flowing through the element (ED) is not affected by the threshold voltage (Vth).

Therefore, according to the present invention, even if the driving transistors (Tdr) are deteriorated and the threshold voltage of the driving transistor (Tdr) is changed, a normal current corresponding to the data voltage (Vdata) is supplied to the light emitting device (ED) in each pixel. can be supplied to Accordingly, the light emitting device ED can normally output light with a brightness proportional to the data voltage Vdata.

However, the luminance of light output from the light emitting device ED gradually decreases as the usage time increases, despite the above-described compensation, and therefore, the luminance of the light emitting display panel gradually decreases.

Additionally, the luminance reduction rate of the light emitting display panel appears differently for each pixel.

Therefore, by the compensation, it is difficult to control the reduction rates of luminance of the pixels to be constant, and it is difficult to prevent a decrease in luminance of the light emitting device ED.

To solve this problem, the light emitting display device according to the present invention, as described above, has the widths of the emission off signals constituting the first emission signal EM1 and the second emission signal EM2. , different or variable methods are used.

For example, the first emission signal EM1 and the second emission signal EM2 are output from the red substages (Rstage 1 to Rstage g) among the substages 611 shown in FIG. 4. These can be emission signals.

In this case, the first emission signal EM1 and the second emission signal EM2 are generated by the red sub-stages (EM1) by a red emission start signal among the emission start signals transmitted from the control unit 400. Rstage 1 to Rstage g), and therefore, the first emission signal EM1 and the second emission signal EM2 have the same waveform as the red emission start signal.

Here, the waveform refers to the region having a low level in the first emission signal EM1 and the second emission signal EM2 shown in FIG. 6, that is, the waveform of the emission off signal Eoff. . Among the first emission signal (EM1) and the second emission signal (EM2) shown in FIG. 6, the area excluding the emission off signal (Eoff) has a high level, and the area with the high level has an emission level. It is Eon.

When both the first emission signal (EM1) and the second emission signal (EM2) are the emission on signal (Eon), the light emitting element (ED) outputs light, and the first emission signal If either (EM1) or the second emission signal (EM2) is the emission off signal (Eoff), the light emitting device (ED) does not output light.

Therefore, as described above, from the fifth period E onwards in which both the first emission signal EM1 and the second emission signal EM2 are maintained at the emission on signal Eon. The light emitting device ED may output light until the first period A arrives again.

In this case, in FIG. 6, the width of the emission off signal (Eoff) constituting the first emission signal (EM1) and the second emission signal (EM2) forms three horizontal periods (3H). Here, the 3 horizontal period is a period corresponding to 3 times the 1 horizontal period, and during the 1 horizontal period, data voltages (Vdat) are output through the data lines.

That is, the 3 horizontal periods (3H) are a period corresponding to 3 times the 1 horizontal period in which the data voltage is output to the data line.

The width of the emission off signal (Eoff) of the first emission signal (EM1) and the second emission signal (EM2) may be changed by the red emission start signal, and the red emission start signal Change of the signal may be performed in the control signal generating unit 420 of the control unit 400.

That is, as explained above, the control unit 400 uses the information stored in the storage unit 450 and the timing signal (TSS) transmitted from the external system to generate the red emission start signal. The form can be changed. Since this method is commonly used in light emitting display devices currently in use, detailed description thereof will be omitted.

During the period in which the emission off signal (Eoff) is output, the driving transistor (Tdr) is initialized as described above, or the data voltage (Vdata) and the threshold voltage (Vth) are charged in the capacitor (Cst). am.

Therefore, the width of the emission off signal (Eoff) is greater than or equal to the period during which the driving transistor (Tdr) is initialized or the data voltage (Vdata) and the threshold voltage (Vth) are charged in the capacitor (Cst). can be changed.

For example, the width of the emission off signal (Eoff) shown in FIG. 6 is determined by the period (A) during which the driving transistor (Tdr) is initialized and the data voltage (Vdata) and the threshold voltage ( Vth) is formed to be larger than the charging period (B to C) by one horizontal period. That is, the width of the emission off signal Eoff shown in FIG. 6 corresponds to three horizontal periods (3H).

However, in FIG. 12, emission signals (EM) including an emission off signal (Eoff) having 4 horizontal periods (4H) are shown, and in FIG. 13, emission signals (EM) including an emission off signal (Eoff) having 6 horizontal periods (6H) are shown. Emission signals (EM) including (Eoff) are shown.

That is, the light emitting display device according to the present invention can change the width of the emission off signal (Eoff) in various ways using the characteristics of the pixels 110, and accordingly, the color of the pixels 110 The luminance reduction rate can be controlled individually, and therefore, the luminance reduction rate of the pixels of the light-emitting display device can be controlled to be constant.

Therefore, according to the present invention, defects such as spotted patterns due to differences in luminance reduction rates for each pixel do not occur.

In this case, the period for setting the width of the emission off signal (Eoff) or changing the width of the emission off signal (Eoff) is determined by the characteristics of the light emitting devices (ED), for example, the light emitting device (ED). It can be set based on information about the relationship between voltage and luminance of the light-emitting element (ED), the lifespan of the light-emitting element (ED), and the luminance reduction rate of the light-emitting element (ED). In particular, the characteristics as described above are, It can be judged by the colors of the elements (EDs).

That is, the storage unit 450 stores information on the above-described characteristics for each color of the light-emitting elements (EDs), and the control unit 400 uses the above-described information to display the light-emitting device. The width of the emission off signals (Eoff) when the device is first driven can be set.

Additionally, the control unit 400 can set the period and degree of change in the width of the emission off signals (Eoff) using the above-described information.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: panel 200: gate driver
300: data driver 400: control unit
600: Emission signal generator 500: Scan signal generator

Claims (11)

A light emitting display panel including pixels including a light emitting device and a pixel driving circuit that drives the light emitting device;
an emission signal generator that supplies an emission signal to an emission transistor provided in the pixel driving circuit to control current flowing to the light emitting device;
a control unit supplying at least two emission start signals to the emission signal generator; and
A storage unit storing information on light emitting characteristics for each color of the light emitting device,
The emission signal generator includes an emission stage that supplies at least two emission signals to horizontal line pixels provided in a row along a scan line provided on the light-emitting display panel,
The emission stage is,
Contains at least two substages,
At least one of the sub-stages is connected to first color pixels that output a first color among the horizontal line pixels,
Another one of the sub-stages is connected to second color pixels that output a second color among the horizontal line pixels,
The control unit adjusts the emission signal applied to the first color pixel and the emission signal applied to the second color pixel differently using the color-specific light emission characteristic information stored in the storage unit,
The pixel driving circuit includes a driving transistor for driving the light emitting element and a plurality of transistors for compensating for deterioration of the driving transistor,
A first emission signal and a second emission signal having different emission off signal widths are applied to the first color pixel,
The light emitting element of the first color pixel is turned on when both the first emission signal and the second emission signal are emission on signals,
The time when the first emission signal changes from an emission off signal to an emission on signal to turn on the light emitting device and the time when the second emission signal changes from an emission off signal to an emission on signal are different light emission. Display device. According to claim 1,
Any one of the at least two sub-stages outputs an emission signal including an emission off signal having a first width,
The remaining at least one sub-stage outputs an emission signal including an emission off signal different from the first width. According to claim 1,
Any one of the at least two sub-stages receives a first emission start signal among the emission start signals,
The remaining at least one sub-stage is a light emitting display device that receives an emission start signal different from the first emission start signal. According to claim 1,
The control unit,
A light emitting display device that changes waveforms of the at least two emission start signals when a preset period elapses. According to claim 1,
The control unit,
A light emitting display device that reduces the width of emission off signals constituting the at least two emission start signals when a preset period elapses. According to claim 1,
The horizontal line pixels further include third color pixels that output a third color,
The emission stage is,
a first sub-stage connected to the first color pixels;
a second sub-stage connected to the second color pixels; and
A light emitting display device comprising a third sub-stage connected to the third color pixels. According to claim 6,
The first sub-stage outputs a first emission signal including an emission off signal having a first width,
The second sub-stage and the third sub-stage output emission signals including an emission off signal having a width different from the first width. According to claim 7,
The second sub-stage outputs a second emission signal including an emission off signal having a second width different from the first width,
The third sub-stage is configured to output a third emission signal including an emission off signal having a third width different from the first width and the second width. According to claim 6,
When the preset period elapses, the controller
Changing the width of the emission off signal constituting the emission start signal supplied to the first substage,
A light emitting display device that changes the width of an emission off signal constituting an emission start signal supplied to the second substage and the third substage. According to clause 9,
The control unit reduces the widths of the emission off signals.



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