Light emitting display device and driving method thereof

Abstract

A light emitting display device and a driving method thereof are provided. The light emitting display device includes a display panel including a sub-pixel, and a driver configured to drive the display panel. In the sub-pixel, initialization of both ends of an organic light emitting diode thereof is performed while a data voltage is written. Accordingly, a problem of display quality deterioration, such as a sudden increase in brightness, flickering, etc., can be minimized.

Description

[0001] This application claims the benefit of Korean Patent Application No. 10-2021-0193364, filed on December 30, 2021, which is incorporated herein by reference as if fully set forth herein. Technical Field

[0002] This invention relates to a light-emitting display device and its driving method. Background Technology

[0003] With the development of information technology, the market for display devices, which serve as a medium for interconnecting users and information, is also expanding. Consequently, the use of display devices such as light-emitting diode (LED) devices, quantum dot (QDD) devices, and liquid crystal display (LCD) devices is increasing.

[0004] The aforementioned display device includes: a display panel, the display panel including sub-pixels; a driver configured to output a drive signal for driving the display panel; and a power supply configured to generate power to the display panel or the driver.

[0005] When driving signals, such as scan signals and data signals, are provided to the sub-pixels formed in the display panel of the display device as described above, the selected sub-pixels transmit light or emit light directly, so that the display device can display an image. Summary of the Invention

[0006] Therefore, the present invention relates to a light-emitting display device and its driving method that substantially overcome one or more problems caused by the limitations and disadvantages of related technologies.

[0007] The purpose of this invention is to provide a light-emitting display device and its driving method in which the two ends of an organic light-emitting diode are initialized with the same voltage at the same time as the data voltage is written, thereby preventing or reducing the problem of excessive current flowing due to high voltage difference generated during driving.

[0008] Other advantages, objects, and features of the invention will be set forth in part in the description which follows, some of which will become apparent to those skilled in the art upon review of the following, or may be learned by practice of the invention. These objects and other advantages of the invention can be realized and obtained through the structures specifically pointed out in the specification, claims, and drawings.

[0009] To achieve these objectives and other advantages, and according to the purposes of the invention, as embodied and generally described herein, a light-emitting display device includes: a display panel comprising sub-pixels; and a driver configured to drive the display panel, wherein, in each sub-pixel, initialization of the terminals of its organic light-emitting diode is performed simultaneously with the writing of a data voltage. Furthermore, a light-emitting display device is also provided, comprising: a display panel comprising sub-pixels; and a driver configured to drive the display panel, wherein, in each sub-pixel, the terminals of its organic light-emitting diode are applied the same high voltage level simultaneously with the writing of a data voltage.

[0010] The two ends of the organic light-emitting diode can be initialized by a first power supply voltage of high voltage level.

[0011] The initialization of the two ends of the organic light-emitting diode can be performed by a switching transistor configured to connect the anode and cathode of the organic light-emitting diode to each other.

[0012] The sub-pixel may include: a first switching transistor configured to write the data voltage; and a second switching transistor configured to initialize both ends of the organic light-emitting diode. The first switching transistor and the second switching transistor may share a gate line at their gate electrodes.

[0013] The organic light-emitting diode can be connected at its anode to a first power supply line that transmits a first power supply voltage of a high voltage level, and at its cathode to a first electrode of a drive transistor configured to generate the drive current required to drive the organic light-emitting diode.

[0014] The sub-pixel may include: a capacitor configured to store the data voltage; an organic light-emitting diode (OLED) having an anode connected to a first power supply line transmitting the high voltage level; a first switching transistor having a gate electrode connected to a gate line, a first electrode connected to a data line, and a second electrode connected to one end of the capacitor; a second switching transistor having a gate electrode connected to the gate line, a first electrode connected to the anode of the OLED, and a second electrode connected to the cathode of the OLED; and a driving transistor having a gate electrode connected to the second electrode of the first switching transistor and one end of the capacitor, a first electrode connected to the cathode of the OLED, and a second electrode connected to the other end of the capacitor and a second power supply line.

[0015] In another aspect of the invention, a driving method for a light-emitting display device is provided, the light-emitting display device including a sub-pixel, the sub-pixel including an organic light-emitting diode (OLED), the OLED being connected at its anode to a first power line transmitting a first power supply voltage of a high voltage level, and at its cathode to a first electrode of a driving transistor configured to generate a driving current. The driving method includes: initializing the terminals of the OLED with the first power supply voltage of a high voltage level while storing a data voltage in a capacitor included in the sub-pixel; and enabling the OLED to emit light based on a driving current generated from the driving transistor.

[0016] The initialization may include: turning on a first switching transistor included in the sub-pixel, turning on a second switching transistor included in the sub-pixel while storing data voltage in the capacitor, and initializing the two ends of the organic light-emitting diode with a first power supply voltage of a high voltage level.

[0017] Enabling the organic light-emitting diode to emit light may include: turning off the first switching transistor and the second switching transistor, driving the driving transistor based on the data voltage, and enabling the organic light-emitting diode to emit light based on the driving current generated from the driving transistor.

[0018] According to an exemplary embodiment of the present invention, the two ends of the organic light-emitting diode (OLED) are initialized with the same voltage at the same time as the data voltage is written, thus preventing or reducing the problem of excessive current flow due to a high voltage difference generated during driving. Furthermore, according to an exemplary embodiment of the present invention, display quality degradation problems, such as sudden increases in brightness and flickering, can be minimized. Moreover, according to an exemplary embodiment of the present invention, the transistor for writing the data voltage and the transistor for initializing the two ends of the OLED can be controlled by a single gate line, thus preventing the problem of increased bezel size when constructing the necessary initialization device. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings:

[0020] Figure 1 This is a schematic block diagram illustrating a light-emitting display device;

[0021] Figure 2 It is shown schematically. Figure 1 The diagram shows the sub-pixels;

[0022] Figure 3 and Figure 4 This is a diagram illustrating the construction of a gate-type scan driver within a panel;

[0023] Figure 5A and Figure 5B This is a diagram illustrating an example arrangement of a gate-type scan driver within a panel;

[0024] Figure 6 This is a circuit diagram of the circuit construction of a sub-pixel according to an exemplary embodiment of the present invention;

[0025] Figure 7 This is a waveform diagram illustrating a sub-pixel driving method according to an exemplary embodiment of the present invention;

[0026] Figure 8 and Figure 9 It shows the basis Figure 7 The circuit diagram showing the working state of the device driving the method.

[0027] Figure 10 It is a circuit diagram constructed based on the circuit of the sub-pixel of the comparative example; and

[0028] Figure 11 and Figure 12 The waveform diagrams are used to illustrate the comparative examples and embodiments of the present invention in contrast. Detailed Implementation

[0029] The display device according to an exemplary embodiment of the present invention can be applied to televisions, image players, personal computers (PCs), home theaters, automotive electronic devices, smartphones, etc., but is not limited thereto. The display device according to an exemplary embodiment of the present invention can be implemented as a light-emitting display (LED) device, a quantum dot display (QDD) device, a liquid crystal display (LCD) device, etc. However, for ease of description, the following description will be given in conjunction with, for example, a light-emitting display device configured to directly emit light based on inorganic light-emitting diodes or organic light-emitting diodes.

[0030] Although the sub-pixels described below will be illustrated with an example of an n-type thin-film transistor, sub-pixels can also be implemented as including p-type thin-film transistors or thin-film transistors having both n-type and p-type characteristics. A thin-film transistor can be a three-electrode device comprising a gate, a source, and a drain. The source is the electrode configured to supply charge carriers to the transistor. Charge carriers in the thin-film transistor first flow out from the source. The drain is the electrode that releases charge carriers from the thin-film transistor to the outside of the thin-film transistor. That is, charge carriers in the thin-film transistor flow from the source to the drain.

[0031] In the case of a p-type thin-film transistor (TFT), the source voltage is higher than the drain voltage, allowing holes to flow from the source to the drain since holes are charge carriers. In a p-type TFT, current flows from the source to the drain because holes flow from the source to the drain. Conversely, in an n-type TFT, the source voltage is lower than the drain voltage, allowing electrons to flow from the source to the drain since electrons are charge carriers. In an n-type TFT, current flows from the drain to the source because electrons flow from the source to the drain. However, in TFTs, the source and drain can be interchanged depending on the applied voltage. Considering this, one of the source and drain will be called the "first electrode," and the other will be called the "second electrode."

[0032] Figure 1 This is a schematic block diagram illustrating a light-emitting display device. Figure 2 It is shown schematically. Figure 1 The diagram shows the sub-pixels.

[0033] like Figure 1 and Figure 2 As shown, the light-emitting display device may include an image supplier 110, a timing controller 120, a scan driver 130, a data driver 140, a display panel 150, a power supply 180, etc.

[0034] Image supply 110 (a set or host system) can output various drive signals as well as image data signals supplied from external sources or stored in its internal memory. Image supply 110 can provide data signals and various drive signals to timing controller 120.

[0035] The timing controller 120 can output a gate timing control signal GDC for controlling the operating timing of the scan driver 130, a data timing control signal DDC for controlling the operating timing of the data driver 140, and various synchronization signals (vertical synchronization signal Vsync and horizontal synchronization signal Hsync). The timing controller 120 can provide the data signal DATA provided by the image supplier 110 along with the data timing signal DDC to the data driver 140. The timing controller 120 can be in the form of an integrated circuit (IC) and therefore can be mounted on a printed circuit board, but is not limited to this.

[0036] The scan driver 130 can output a scan signal (or scan voltage) in response to the gate timing control signal GDC provided from the timing controller 120. The scan driver 130 can provide scan signals to the sub-pixels included in the display panel 150 through gate lines GL1 to GLm. The scan driver 130 can be in the form of an IC, or it can be formed directly on the display panel 150 as an in-panel gate, but is not limited thereto.

[0037] The data driver 140 can sample and latch the data signal DATA in response to the data timing control signal DDC provided from the timing controller 120. The data driver 140 can convert the resulting digital data signal into an analog data voltage based on a gamma reference voltage and can output this data voltage. The data driver 140 can provide data voltages to the sub-pixels included in the display panel 150 via data lines DL1 to DLn. The data driver 140 can be in the form of an IC and therefore can be mounted on the display panel 150, or it can be mounted on a printed circuit board, but is not limited thereto.

[0038] Power supply 180 can generate a first power supply voltage with a high level and a second power supply voltage with a low level based on an external input voltage supplied from outside, and can output the first power supply voltage and the second power supply voltage through a first power supply line EVDD and a second power supply line EVSS. Power supply 180 can not only generate and output the first power supply voltage and the second power supply voltage, but also generate and output voltages required to drive scan driver 130 (e.g., gate voltages including gate high voltage and gate low voltage), voltages required to drive data driver 140 (drain voltages including drain voltage and half-drain voltage), and so on.

[0039] The display panel 150 can display images corresponding to drive signals including scan signals and data voltages, a first power supply voltage, a second power supply voltage, etc. The sub-pixels of the display panel 150 can emit light directly. The display panel 150 can be manufactured based on a substrate with rigidity or flexibility, such as glass, silicon, polyimide, etc. The light-emitting sub-pixels can be composed of red, green, and blue sub-pixels, or composed of red, green, blue, and white sub-pixels.

[0040] For example, a sub-pixel SP may include pixel circuitry connected to a first data line DL1, a first gate line GL1, a first power line EVDD, and a second power line EVSS, and includes a switching transistor, a driving transistor, a capacitor, an organic light-emitting diode (OLED), etc. Since the sub-pixel SP emits light directly, the sub-pixel SP used in a light-emitting display device has a complex circuit configuration. Furthermore, not only are the compensation circuits configured to compensate for the degradation of the emitting OLED different, but the driving transistors configured to provide the driving current required to drive the OLED are also different. However, for ease of illustration, the sub-pixel SP is simply shown in the form of a block.

[0041] Furthermore, in the above description, the timing controller 120, scan driver 130, data driver 140, etc., are described as having separate configurations. However, depending on the implementation type of the light-emitting display device, one or more of the timing controller 120, scan driver 130, and data driver 140 can be integrated into a single IC.

[0042] Figure 3 and Figure 4 This is a diagram illustrating the construction of a gate-type scan driver within a panel. Figure 5A and Figure 5B This is a diagram illustrating an example arrangement of a gate-type scan driver within a panel.

[0043] like Figure 3 As shown, the in-panel gate type scan driver, indicated by reference numeral "130", may include a shift register 131 and a level shifter 135. The level shifter 135 can generate a clock signal Clk and a start signal Vst based on signals and voltages output from a timing controller 120 and a power supply 180. The clock signal Clk can be generated with K different phases (K is an integer of 2 or greater), such as 2-phase, 4-phase, or 8-phase.

[0044] The shift register 131 can operate based on the signals Clk and Vst output from the level converter 135, and can output scan signals Scan[1] to Scan[m] that can turn on or off the transistors formed on the display panel. The shift register 131 can be formed on the display panel in the form of a thin film as an in-panel gate.

[0045] like Figure 3 and Figure 4 As shown, unlike shift register 131, level shifter 135 can be formed independently as an IC or can be included within power supply 180. However, this configuration is merely illustrative, and exemplary embodiments of the invention are not limited thereto.

[0046] like Figure 5A and Figure 5B As shown, in a gate-type scan driver within the panel, shift registers 131a and 131b that output scan signals can be located in the non-display area NA of the display panel 150. Figure 5A As shown, shift registers 131a and 131b can be located in the non-display areas NA on the left and right sides of the display panel 150, or as... Figure 5B As shown, the non-display areas NA can be set at the upper and lower parts of the display panel 150. Additionally, although in Figure 5A and Figure 5BThe shift registers 131a and 131b are shown and described as being located in the non-display area NA, but exemplary embodiments of the present invention are not limited thereto.

[0047] Figure 6 This is a circuit diagram of the circuit construction of a sub-pixel according to an exemplary embodiment of the present invention. Figure 7 This is a waveform diagram illustrating a sub-pixel driving method according to an exemplary embodiment of the present invention. Figure 8 and Figure 9 It shows the basis Figure 7 The circuit diagram showing the working state of the device driving the method.

[0048] like Figure 6 As shown, according to an exemplary embodiment of the present invention, a sub-pixel may include a first switching transistor SW1, a second switching transistor SW2, a driving transistor DT, a capacitor CST, and an organic light-emitting diode OLED.

[0049] The first switching transistor SW1 can be connected to the first gate line GL1 at its gate electrode, to the first data line DL1 at its first electrode, and to the gate electrode of the driving transistor DT and one end of the capacitor CST at its second electrode. The function of the first switching transistor SW1 can be to transmit the data voltage applied through the first data line DL1 to the first electrode of the capacitor CST.

[0050] The second switching transistor SW2 can be connected to the first gate line GL1 at its gate electrode, to the first power line EVDD and the anode of the organic light-emitting diode (OLED) at its first electrode, and to the cathode of the OLED at its second electrode. In other words, the first switching transistor SW1 and the second switching transistor SW2 can both be connected to the first gate line GL1 at their gate electrodes. The function of the second switching transistor SW2 can be to interconnect the anode and cathode of the OLED to initialize both ends of the OLED.

[0051] The driving transistor DT can be connected at its gate electrode to the second electrode of the first switching transistor SW1 and one end of the capacitor CST, at its first electrode to the cathode of the organic light-emitting diode OLED, and at its second electrode to the other end of the capacitor CST and the second power supply line EVSS. The function of the driving transistor DT is to generate a driving current corresponding to the data voltage stored in the capacitor CST.

[0052] The capacitor CST can be connected at one end to the second electrode of the first switching transistor SW1 and the gate electrode of the driving transistor DT, and at the other end to the second electrode of the driving transistor DT and the second power supply line EVSS. The function of the capacitor CST is to store the data voltage used to drive the driving transistor DT.

[0053] An organic light-emitting diode (OLED) can be connected at its anode to the first power line EVDD and the first electrode of the second switching transistor SW2, and at its cathode to the second electrode of the second switching transistor SW2 and the first electrode of the driving transistor DT. The function of an OLED is to emit light in a manner corresponding to the operation (driving current) of the driving transistor.

[0054] According to an exemplary embodiment of the present invention, the sub-pixel can perform degradation estimation and compensation on the organic light-emitting diode (OLED), the driving transistor (DT), etc., based on the algorithm included in the timing controller, without performing separate sensing on the organic light-emitting diode, the driving transistor (DT), etc.

[0055] like Figure 7 As shown, the sub-pixels according to an exemplary embodiment of the present invention can operate in the order of initialization and data writing periods and emission periods.

[0056] The initialization and data writing period is the period during which the data voltage is stored in the capacitor CST of the sub-pixel, and the two ends of the organic light-emitting diode OLED are initialized at the same time.

[0057] The light-emitting period is the period during which the data voltage stored in the capacitor CST of the sub-pixel drives the driving transistor DT, thereby causing the organic light-emitting diode (OLED) to emit light.

[0058] The first gate signal Gate1 can be applied at a high voltage level H during the initialization and data writing periods, and at a low gate voltage level L during the light emission period. The high gate voltage H can represent the turn-on voltage that enables the switching transistors included in the sub-pixel to be turned on, while the low gate voltage L can represent the turn-off voltage that enables the switching transistors to be turned off.

[0059] The data voltage Vdata can be applied during the initialization and data writing periods, instead of during the emission period. The data voltage Vdata can be output from the data driver and can be configured to enable the organic light-emitting diode (OLED) to emit light at a specific brightness (specific gray level).

[0060] like Figure 7 and Figure 8As shown, when the first gate signal Gate1, which is a gate high voltage H, is applied through the first gate line GL1 during the initialization and data writing period, the first switching transistor SW1 and the second switching transistor SW2 can be turned on.

[0061] With the first switching transistor SW1 turned on, the data voltage Vdata applied through the first data line DL1 can be transmitted to one end of the capacitor CST. Furthermore, with the second switching transistor SW2 turned on, the high-voltage first power supply voltage Evdd transmitted through the first power supply line EVDD can be transmitted to the anode and cathode of the organic light-emitting diode (OLED). In other words, both ends of the OLED, including the anode and cathode, can be initialized with the same voltage.

[0062] like Figure 7 and Figure 9 As shown, when a first gate signal Gate1 with a low gate voltage L is applied through the first gate line GL1 during the light-emitting period, the first switching transistor SW1 and the second switching transistor SW2 can be turned off.

[0063] With the first switching transistor SW1 and the second switching transistor SW2 off, the data voltage stored in the capacitor CST can be released, and this released data voltage can be applied to the gate electrode of the driving transistor DT. Since the data voltage stored in the capacitor CST is applied to the gate electrode of the driving transistor DT, the driving transistor DT can be turned on, thereby generating a drive current that can flow from the first power line EVDD to the second power line EVSS. As a result, the organic light-emitting diode (OLED) can emit light in a manner corresponding to the drive current generated from the driving transistor DT.

[0064] Figure 10 It is a circuit diagram constructed based on the circuit of the sub-pixel of the comparative example. Figure 11 and Figure 12 The waveform diagrams are used to illustrate the comparative examples and embodiments of the present invention in contrast.

[0065] exist Figure 11 and Figure 12 In this context, "Gate" represents the gate signal, "Vdata" represents the data voltage, "DT_d" represents the voltage applied to the drain electrode of the driving transistor, "DT_g" represents the voltage applied to the gate electrode of the driving transistor, and "Ioled" represents the current flowing through the organic light-emitting diode.

[0066] In order to compare the comparative examples with the embodiments, Figure 11 and Figure 12The diagram illustrates the current and voltage waveforms when a high grayscale level (256 grayscale levels) drive is intentionally applied to the first frame (1 Frame), followed by a low grayscale level (22 grayscale levels) drive intentionally applied to the period from the second frame (2 Frame) to the fifth frame (5 Frame). Additionally, it should be noted that... Figure 11 and Figure 12 In the figure, the portion of the graph showing the current Ioled flowing through the organic light-emitting diode in the first frame (1Frame) extends beyond the graph and is therefore not shown, because a high grayscale drive is performed on the first frame.

[0067] like Figure 10 As shown, although the sub-pixels according to the comparative example are similar to those of the embodiments, the sub-pixels according to the comparative example do not include a structure (second switching transistor) capable of enabling conduction between the two ends of the organic light-emitting diode. That is, in the sub-pixels according to the comparative example, there is no structure or method capable of initializing the two ends of the organic light-emitting diode OLED during the data writing period.

[0068] As a result, in the comparative examples, such as Figure 11 As shown in the rectangular dashed box, when high grayscale driving is performed on the first frame (Frame 1), a large amount of current (inrush current) can flow to the next frame, i.e., the second frame (Frame 2), due to the high voltage difference generated between the two ends of the organic light-emitting diode (OLED). The reason for the high voltage difference between the two ends of the OLED is that the anode of the OLED is directly connected to the first power line transmitting the high-voltage power supply, while the drain node (or cathode) is at a low voltage level. Therefore, in the comparative example, display quality degradation problems may occur, such as sudden increases in brightness and flickering.

[0069] On the other hand, such as Figures 7 to 9 As shown, the sub-pixel according to the embodiment includes a structure (second switching transistor) capable of enabling conduction between the two ends of the organic light-emitting diode. That is, in the sub-pixel according to the embodiment, there is a structure or method capable of initializing the two ends of the organic light-emitting diode OLED during the data writing period.

[0070] As a result, in the embodiments, such as Figure 12 As shown in the rectangular dashed box, although high grayscale driving is performed on the first frame (1Frame), the two ends of the OLED are initialized with the same voltage. This prevents or reduces the problem of excessive current flow (inrush current) in the next frame due to a high voltage difference across the OLED. Therefore, in this embodiment, display quality degradation problems such as sudden increases in brightness and flickering can be minimized.

[0071] As is evident from the above description, according to the exemplary embodiments of the present invention, the two ends of the organic light-emitting diode are initialized with the same voltage at the same time as the data voltage is written, thus preventing or reducing the problem of excessive current flow due to high voltage differences during driving. Furthermore, according to the exemplary embodiments of the present invention, display quality degradation problems, such as sudden increases in brightness and flickering, can be minimized. Moreover, according to the exemplary embodiments of the present invention, the transistor for writing the data voltage and the transistor for initializing the two ends of the organic light-emitting diode can be controlled by a single gate line, thus preventing the problem of increased bezel size when constructing the necessary initialization device.

[0072] The above description and accompanying drawings are provided to illustrate the technical concept of the present invention. Those skilled in the art will understand that various modifications and variations can be obtained by combining, splitting, substituting, or changing the constituent elements without altering the essential features of the invention. Therefore, the embodiments disclosed herein should be interpreted as merely illustrative and not as limiting the principles and scope of the invention. It should be understood that the scope of the invention is defined by the appended claims, and all equivalents thereof should fall within the scope of the invention.

Claims

1. A light-emitting display device, comprising: Display panel including sub-pixels; A driver configured to drive the display panel; as well as, A timing controller configured to control the driver. The sub-pixels include: A capacitor configured to store data voltage; Organic light-emitting diode; A drive transistor configured to generate the drive current required to drive the organic light-emitting diode. A first switching transistor configured to write the data voltage, the first switching transistor having a gate electrode connected to a gate line, a first electrode connected to a data line, and a second electrode, the second electrode being connected to one end of the capacitor and to the gate electrode of the driving transistor; and The second switching transistor is configured to initialize the two ends of the organic light-emitting diode. One end of the capacitor is directly connected to the gate electrode of the driving transistor, and the other end of the capacitor is directly connected to the second power supply line. Specifically, in the sub-pixel, during the initialization and data writing periods, the initialization of the two ends of its organic light-emitting diode is performed simultaneously with the writing of the data voltage, and The first switching transistor and the second switching transistor are connected to a common gate line at their gate electrodes, and The timing controller is configured to perform degradation estimation and compensation for the organic light-emitting diode and the driving transistor based on an algorithm included therein, without sensing the organic light-emitting diode and the driving transistor separately.

2. The light-emitting display device according to claim 1, wherein the two ends of the organic light-emitting diode are initialized by a first power supply voltage of a high voltage level.

3. The light-emitting display device according to claim 1, wherein the initialization of the two ends of the organic light-emitting diode is performed by the second switching transistor configured to connect the anode and cathode of the organic light-emitting diode to each other.

4. The light-emitting display device according to claim 1, wherein the organic light-emitting diode is connected at its anode to a first power supply line transmitting a first power supply voltage of a high voltage level, and at its cathode to a first electrode of the driving transistor.

5. The light-emitting display device according to claim 2, The organic light-emitting diode has an anode connected to a first power supply line that transmits the high voltage level. The second switching transistor has a gate electrode connected to the gate line, a first electrode connected to the anode of the organic light-emitting diode, and a second electrode connected to the cathode of the organic light-emitting diode. The driving transistor has a gate electrode connected to the second electrode of the first switching transistor and one end of the capacitor, a first electrode connected to the cathode of the organic light-emitting diode, and a second electrode connected to the other end of the capacitor and a second power line.

6. A driving method for a light-emitting display device according to any one of claims 1 to 5, the driving method comprising: During the initialization and data writing phase, while storing the data voltage in the capacitor included in the sub-pixel, the two ends of the organic light-emitting diode are initialized by a first power supply voltage of a high voltage level. as well as During the light-emitting period, the organic light-emitting diode is able to emit light based on the drive current generated from the driving transistor.

7. The driving method according to claim 6, wherein the initialization and data writing period includes: The first switching transistor included in the sub-pixel is turned on, the second switching transistor included in the sub-pixel is turned on while storing the data voltage in the capacitor, and the two ends of the organic light-emitting diode are initialized by a first power supply voltage of a high voltage level.

8. The driving method according to claim 7, wherein the light-emitting period during which the organic light-emitting diode is able to emit light includes: The first and second switching transistors are turned off, the driving transistor is driven based on the data voltage, and the organic light-emitting diode is enabled to emit light based on the driving current generated from the driving transistor.

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