Light emitting display device

Abstract

A light-emitting display device is provided, comprising: a light-emitting device configured to emit light; and a pixel driving circuit configured to drive the light-emitting device, wherein the pixel driving circuit comprises: a first circuit portion including a driving transistor and connected to a data line and a first driving voltage line, wherein a first driving voltage is provided to the first driving voltage line; a second circuit portion connected to the light-emitting device and a second driving voltage line, wherein a second driving voltage is provided to the second driving voltage line; and an emitting transistor connected between the first circuit portion and the second circuit portion.

Description

Cross-references to related applications

[0001] This application claims the benefit of Korean Patent Application No. 10-2024-0189440, filed on December 18, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to a light-emitting display device. Background Technology

[0003] Emitting light display devices are installed on or incorporated into electronic products (such as televisions, monitors, laptops, smartphones, tablets, electronic boards, wearable devices, smartwatches, portable information devices, navigation devices, or vehicle control display devices) to display images.

[0004] The light-emitting display panel constituting the light-emitting display device is provided with pixels, and each pixel is provided with a light-emitting device.

[0005] When a light-emitting display device is used for an extended period, the driving transistor may degrade, causing the light-emitting device connected to the driving transistor to fail to emit light properly. This can lead to a deterioration in the quality of the light-emitting display device. Summary of the Invention

[0006] Therefore, this disclosure relates to providing a light-emitting display device that substantially eliminates one or more problems caused by the limitations and disadvantages of related technologies.

[0007] The purpose of this disclosure is to provide a light-emitting display device capable of emitting light from a light-emitting device regardless of the threshold voltage of the driving transistor.

[0008] Additional advantages and features of this disclosure will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following, or may be learned from practice of this disclosure. The purposes and other advantages of this disclosure may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0009] To achieve these and other advantages and for the purposes of this disclosure, as embodied and broadly described herein, a light-emitting display device is provided, comprising: a light-emitting device configured to emit light; and a pixel driving circuit configured to drive the light-emitting device, wherein the pixel driving circuit comprises: a first circuit portion including a driving transistor and connected to a data line and a first driving voltage line, a first driving voltage being provided to the first driving voltage line; a second circuit portion connected to the light-emitting device and a second driving voltage line, a second driving voltage being provided to the second driving voltage line; and an emitting transistor connected between the first circuit portion and the second circuit portion.

[0010] It should be understood that the foregoing general description and the following detailed description of this disclosure are illustrative and explanatory, and are intended to provide further explanation of the claimed disclosure. Attached Figure Description

[0011] The accompanying drawings, included to provide a further understanding of this disclosure and incorporated into and constituting a part of this application, illustrate embodiments of the disclosure and, together with the specification, serve to explain the principles of the disclosure. In the drawings:

[0012] Figure 1 This is an example diagram illustrating the configuration of a light-emitting display device according to an embodiment of the present disclosure;

[0013] Figure 2 This is an example diagram illustrating the structure of pixels applied to an embodiment of a light-emitting display device according to the present disclosure;

[0014] Figure 3 This is an example diagram illustrating the structure of a control driver applied to an embodiment of a light-emitting display device according to the present disclosure;

[0015] Figure 4 This is an example diagram illustrating the structure of a gate driver applied to an embodiment of a light-emitting display device according to the present disclosure;

[0016] Figure 5 This is an example diagram illustrating the structure of a data driver applied to an embodiment of a light-emitting display device according to the present disclosure;

[0017] Figure 6 This is an example diagram showing the waveform of a signal provided to a pixel of a light-emitting display device according to an embodiment of the present disclosure;

[0018] Figure 7 This is an example diagram illustrating the structure during the initialization period of a pixel applied to a light-emitting display device according to an embodiment of the present disclosure;

[0019] Figure 8 This is an example diagram illustrating the structure during the threshold voltage sensing period of a pixel applied to a light-emitting display device according to an embodiment of the present disclosure;

[0020] Figure 9 This is an example diagram illustrating the structure during the data writing period of a pixel applied to an embodiment of a light-emitting display device according to the present disclosure;

[0021] Figure 10 This is an example diagram illustrating the structure during the reset period of a pixel applied to an embodiment of a light-emitting display device according to the present disclosure;

[0022] Figure 11 This is an example diagram illustrating the structure during the light-emitting period of a pixel in a light-emitting display device applied according to an embodiment of the present disclosure;

[0023] Figures 12 to 14 These are additional example diagrams illustrating the structure of pixels applied to an embodiment of a light-emitting display device according to the present disclosure;

[0024] Figure 15 It is shown that it is provided to Figure 13 and Figure 14 Example diagram of the signal waveform of the pixel shown; and

[0025] Figures 16A to 16D This is an example diagram illustrating the effect of a change in the magnitude of a second driving voltage applied to a display device according to an embodiment of this disclosure. Detailed Implementation

[0026] Reference will now be made in detail to exemplary embodiments of this disclosure, examples of which are illustrated in the accompanying drawings. Where possible, the same reference numerals will be used throughout the drawings to refer to the same or similar parts.

[0027] The advantages, features, and implementation methods of this disclosure will be illustrated by the following embodiments described with reference to the accompanying drawings. However, this disclosure may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of this disclosure to those skilled in the art.

[0028] The shapes, dimensions, ratios, angles, and quantities disclosed in the accompanying drawings to describe embodiments of this disclosure are merely examples, and therefore, this disclosure is not limited to the details shown. The same reference numerals always refer to the same elements. In the following description, detailed descriptions will be omitted where it is determined that such detailed descriptions of relevant known functions or configurations would unnecessarily obscure the focus of this disclosure. When using the terms "comprising," "having," and "including" as described in this disclosure, an additional part may be added unless "only" is used. Singular terms may include plural forms unless otherwise stated.

[0029] When interpreting an element, it is interpreted as including a range of errors or tolerances, even though there is no explicit description of such a range of errors or tolerances.

[0030] When describing positional relationships, for example, when the positional relationship between two parts is described as such as "on," "above," "below," and "adjacent," one or more other parts may be placed between the two parts, unless more restrictive terms such as "is" or "directly" are used.

[0031] When describing temporal relationships, such as when time sequence is described as “after,” “following,” “next,” or “before,” discontinuous situations may be included unless more restrictive terms such as “just,” “immediately,” or “directly” are used.

[0032] It should be understood that although the terms "first," "second," etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another and may not define an order. For example, without departing from the scope of this disclosure, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0033] In describing the elements of this disclosure, the terms “first,” “second,” “A,” “B,” “(a),” “(b),” etc., may be used. These terms are intended to identify corresponding elements from other elements, and the basis, order, or number of corresponding elements shall not be limited by these terms. Unless otherwise stated, the expression “connected,” “coupled,” or “adhered” to another element or layer shall be understood to mean that an element or layer may be directly connected or adhered to another element or layer, or indirectly connected or adhered to another element or layer, wherein one or more intermediate elements or layers are “set” or “inserted” between the element or layer and the other element or layer.

[0034] The term "at least one" should be understood to include any and all combinations of one or more associated listed items. For example, "at least one of the first, second, and third items" means a combination of two or more items from the first, second, and third items, as well as all items derived from the first, second, or third item. Furthermore, the term "may" as used herein includes all meanings and definitions of the word "may".

[0035] As will be fully understood by those skilled in the art, the features of the various embodiments of this disclosure may be coupled or combined with each other in part or in whole, and may interoperate differently with each other and be technically driven. Embodiments of this disclosure may be performed independently of each other, or may be performed together in an interdependent relationship.

[0036] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0037] Figure 1 This is an example diagram illustrating the configuration of a light-emitting display device according to an embodiment of the present disclosure. Figure 2 This is an example diagram illustrating the structure of pixels applied to an embodiment of a light-emitting display device according to the present disclosure. Figure 3 This is an example diagram illustrating the structure of a control driver applied to a light-emitting display device according to an embodiment of the present disclosure. Figure 4 This is an example diagram illustrating the structure of a gate driver applied to an embodiment of a light-emitting display device according to the present disclosure, and Figure 5 This is an example diagram illustrating the structure of a data driver applied to an embodiment of a light-emitting display device according to the present disclosure.

[0038] The light-emitting display device according to embodiments of this disclosure can be used as a variety of electronic devices. These electronic devices may be, for example, televisions, monitors, etc.

[0039] like Figure 1 As shown, an embodiment of the light-emitting display device according to the present disclosure may include: a light-emitting display panel 100, which includes a display area DA for displaying an image and a non-display area NDA disposed outside the display area DA; a gate driver 200, which provides gate signals GS to a plurality of gate lines GL1 to GLg disposed in the display area DA of the light-emitting display panel 100; a data driver 300, which provides data voltage Vdata to a plurality of data lines DL1 to DLd disposed in the display area DA of the light-emitting display panel 100; a control driver 400, which controls the driving of the gate driver 200 and the data driver 300; and a power supply unit 500, which supplies power to the control driver 400, the gate driver 200, the data driver 300 and the light-emitting display panel 100.

[0040] First, the light-emitting display panel 100 may include a display area DA and a non-display area NDA. Gate lines GL1 to GLg, data lines DL1 to DLd, and pixels P may be disposed in the display area DA. Therefore, an image can be displayed in the display area DA. Here, g and d are natural numbers. The non-display area NDA may surround the outer periphery of the display area DA.

[0041] like Figure 2 As shown, the pixel P included in the light-emitting display panel 100 may include a light-emitting device ED and a pixel driving circuit PDC that drives the light-emitting device.

[0042] The pixel driving circuit may include: a first circuit portion 1CU, which includes a driving transistor Tdr and is connected to a data line DL and a first driving voltage line 1DVL, wherein a first driving voltage Va is provided to the first driving voltage line 1DVL; a second circuit portion 2CU, which is connected to a light-emitting device ED and a second driving voltage line 2DVL, wherein a second driving voltage Vb is provided to the second driving voltage line 2DVL; and an emitting transistor T6, which is connected between the first circuit portion 1CU and the second circuit portion 2CU.

[0043] The first circuit section 1CU may include a driving transistor Tdr having a first terminal connected to a first voltage supply line PLA, a first transistor T1 having a first terminal connected to a data line DL, a first capacitor C1 connected between the gate of the driving transistor Tdr and a second terminal of the first transistor T1, a second transistor T2 connected between a reference voltage supply line RVL and the gate of the driving transistor Tdr, a third transistor T3 connected between a second terminal of the first transistor T1 and a second terminal of the driving transistor Tdr, a second capacitor C2 connected between a second terminal of the first transistor T1 and a second terminal of the driving transistor Tdr, and a fourth transistor T4 connected between a first driving voltage line 1DVL and a second terminal of the driving transistor Tdr. In this case, an emitter transistor T6 may be connected between the second terminal of the driving transistor Tdr and the second circuit section 2CU.

[0044] The second circuit section 2CU may include a fifth transistor T5 connected between the second drive voltage line 2DVL and the first terminal of the light-emitting device ED, and a third capacitor Coled connected between the first and second terminals of the light-emitting device ED. However, the third capacitor Coled may be omitted. In this case, the emitting transistor T6 may be connected between the first circuit section 1CU and the first terminal of the light-emitting device ED.

[0045] A light-emitting device (ED) may include: a first electrode, which is supplied with a first voltage EVDD via a driving transistor Tdr; a second electrode, which is connected to a second voltage supply line PLB, through which a second voltage is supplied; and a light-emitting layer disposed between the first electrode and the second electrode. The first electrode may be an anode, and the second electrode may be a cathode.

[0046] The structure of the pixel P applied to the light-emitting display device according to embodiments of the present disclosure is not limited to... Figure 2 The structure shown is such that the structure of pixel P can be changed into various shapes.

[0047] The control driver 400 can rearrange the input data signal IData transmitted from the external system 600 by using the timing synchronization signal TSS transmitted from the external system, and can generate a data control signal DCS to be provided to the data driver 300 and a gate control signal GCS to be provided to the gate driver 200.

[0048] Therefore, such as Figure 3 As shown, the control driver 400 may include: a data aligner 430 that rearranges the input data signal IData to generate a data signal Data; a control signal generator 420 that generates a gate control signal GCS and a data control signal DCS using a timing synchronization signal TSS; an input section 410 that transmits the timing synchronization signal TSS transmitted from the external system 600 to the control signal generator 420 and transmits the input data signal IData transmitted from the external system 600 to the data aligner 430; and an output section 440 that provides the data signal Data generated by the data aligner 430 and the data control signal DCS generated by the control signal generator 420 to the data driver 300, and provides the gate control signal GCS generated by the control signal generator 420 to the gate driver 200.

[0049] The control signal generator 420 can generate power control signals for the power supply unit 500.

[0050] The control driver 400 may also include a storage unit for storing various types of information. The storage unit 450 may include, for example, […]. Figure 3 The control driver 400 shown can be separated from the control driver 400 and provided independently.

[0051] The external system 600 can perform the functions of driving and controlling the driver 400 and electronic devices.

[0052] For example, when the electronic device is a television (TV), the external system 600 can receive various audio and video information through a communication network and can transmit the received video information to the control driver 400. For example, the external system 600 can convert the video information into an input data signal IData and transmit the input data signal IData to the control driver 400.

[0053] The power supply unit 500 can generate various powers and supply the generated power to the control driver 400, the gate driver 200, the data driver 300, and the light-emitting display panel 100.

[0054] The gate driver 200 can be directly embedded in the non-display area NDA using a gate in panel (GIP) type, or the gate driver 200 can be set in the display area DA in which a light-emitting device ED is set, or the gate driver 200 can be set on a film-on-chip mounted in the non-display area NDA.

[0055] The gate driver 200 can provide gate pulses GP1 to GPg to the gate lines GL1 to GLg.

[0056] When the gate pulse GP generated by the gate driver 200 is provided to the gate of the first transistor T1 included in the pixel P, the first transistor T1 can be turned on. When the first transistor T1 is turned on, the data voltage Vdata provided through the data line DL can be provided to the pixel P.

[0057] When a gate turn-off signal generated by the gate driver 200 is provided to the first transistor T1, the first transistor T1 can be turned off. When the first transistor T1 is turned off, the data voltage can no longer be provided to the pixel P.

[0058] The gate signal SC1 provided to the gate line GL may include the gate pulse GP and the gate turn-off signal.

[0059] In order to provide gate pulses GP1 to GPg to gate lines GL1 to GLg, such as Figure 4 As shown, the gate driver 200 may include stages ST1 to STg connected to gate lines GL1 to GLg.

[0060] Each of stages ST1 to STg may be connected to one gate line GL, but may be connected to at least two gate lines GL.

[0061] To generate gate pulses GP1 to GPg, a gate start signal VST generated by the control signal generator 420 and at least one gate clock GCLK can be transmitted to the gate driver 200. For example, the gate start signal VST and at least one gate clock GCLK can be included in the gate control signal GCS.

[0062] One of stages ST1 to STg can be driven by the gate start signal VST to output the gate pulse GP to the gate line GL. The gate pulse GP can be generated by the gate clock GCLK.

[0063] At least one of the signals output from the stage ST that outputs the gate pulse can be provided to another stage ST to drive that other stage ST. Therefore, a gate pulse can be output in another stage ST.

[0064] For example, the stage ST can be driven sequentially to sequentially provide gate pulses GP to the gate line GL.

[0065] In the following description, the gate signal SC1 may be referred to as the first scan signal.

[0066] In this case, in addition to the gate signal SC1, each stage ST can also generate the signal to be provided to... Figure 2 The second scan signal SC2, the third scan signal SC3, and the transmit signal EM are shown for pixel P. Therefore, each stage ST can be formed in various configurations.

[0067] Each of the second scan signal SC2, the third scan signal SC3, and the transmit signal EM can include a high level that can turn on the transistor and a low level that can turn off the transistor.

[0068] The data driver 300 can supply the data voltage Vdata to the data lines DL1 to DLd.

[0069] Therefore, such as Figure 5 As shown, the data driver 300 may include a shift register 310 for outputting a sampled signal, a latch 320 for latching a data signal Data received from the control driver 400, a digital-to-analog converter 330 for converting the data signal Data transmitted from the latch 320 into a data voltage Vdata and outputting the data voltage Vdata, and an output buffer 340 for outputting the data voltage transmitted from the digital-to-analog converter 330 to the data line DL based on the source output enable signal SOE.

[0070] The shift register 310 can output a sampled signal using a data control signal DCS received from the control signal generator 420. For example, the data control signal DCS transmitted to the shift register 310 may include a source start pulse SSP and a source shift clock signal SSC.

[0071] The latch 320 can latch the data signal Data received sequentially from the control driver 400, and then simultaneously output the data signal Data to the digital-to-analog converter 330 based on the sampled signal.

[0072] The digital-to-analog converter 330 can convert the data signal Data transmitted from the latch 320 into a data voltage Vdata and output the data voltage Vdata.

[0073] The output buffer 340 can output the data voltage Vdata transmitted from the digital-to-analog converter 330 to the data lines DL1 to DLd of the light-emitting display panel 100 based on the source output enable signal SOE transmitted from the control signal generator 420.

[0074] For this purpose, the output buffer 340 may include a buffer 341 that stores the data voltage Vdata transmitted from the digital-to-analog converter 330 and a switch 342 that outputs the data voltage Vdata stored in the buffer 341 to the data line DL based on the source output enable signal SOE.

[0075] For example, when switch 342 is turned on based on the source output enable signal SOE simultaneously provided to switch 342, the data voltage Vdata stored in buffer 341 can be provided to data lines DL1 to DLd through switch 342.

[0076] The data voltage Vdata supplied to data lines DL1 to DLd can be supplied to pixel P connected to the gate line GL, which is provided with the gate pulse GP.

[0077] Figure 6 This is an example diagram showing the waveform of a signal provided to a pixel of a light-emitting display device according to an embodiment of the present disclosure. Figure 7 This is an example diagram illustrating the structure during the initialization period of a pixel in a light-emitting display device according to an embodiment of the present disclosure. Figure 8 This is an example diagram illustrating the structure during the threshold voltage sensing period of a pixel in a light-emitting display device according to an embodiment of the present disclosure. Figure 9 This is an example diagram illustrating the structure during the data writing period of a pixel in a light-emitting display device applied according to an embodiment of the present disclosure. Figure 10 This is an example diagram illustrating the structure during the reset period of a pixel in a light-emitting display device according to an embodiment of the present disclosure, and Figure 11 This is an example diagram illustrating the structure during the light-emitting period of a pixel in a light-emitting display device applied according to an embodiment of the present disclosure. Specifically, Figure 6 This illustrates the signal provided from the nth stage connected to the nth gate line to the pixel P connected to the nth gate line.

[0078] In the following text, see references Figures 1 to 11 This document describes a driving method for a light-emitting display device according to embodiments of the present disclosure.

[0079] First, refer to Figure 6 and Figure 7 During the initialization period (A), a low-level gate signal SC1 can be provided to the gates of the first transistor T1 and the fourth transistor T4, a high-level second scan signal SC2 can be provided to the gates of the second transistor T2 and the third transistor T3, a high-level third scan signal SC3 can be provided to the gate of the fifth transistor T5, and a high-level transmit signal EM can be provided to the transmit transistor T6.

[0080] Therefore, the second transistor T2, the third transistor T3, the fifth transistor T5 and the emitter transistor T6 can be turned on, and the first transistor T1 and the fourth transistor T4 can be turned off.

[0081] In this configuration, a reference voltage Vref can be provided to the gate of the driving transistor Tdr via the second transistor T2, a second driving voltage Vb can be provided to the first electrode of the light-emitting device ED, and the second driving voltage Vb can be provided to the second terminal of the driving transistor Tdr via the emitting transistor T6. In the following description, the gate of the driving transistor Tdr can be represented by reference numeral N1, and the second terminal of the driving transistor Tdr can be represented by reference numeral N2.

[0082] Therefore, the gate N1 of the driving transistor Tdr can be initialized by the reference voltage Vref, the second terminal N2 of the driving transistor Tdr can be initialized by the second driving voltage Vb, and the first electrode of the light-emitting device ED can be initialized by the second driving voltage Vb.

[0083] In other words, during the initialization period (A), the gate and second terminal of the driving transistor Tdr, as well as the first electrode of the light-emitting device ED, can be initialized.

[0084] In this case, the potential difference (=Vref-Vb) between the reference voltage Vref and the second driving voltage Vb can be stored in the first capacitor C1, and 0V can be stored in the second capacitor C2.

[0085] Next, refer to Figure 6 and Figure 8 During the threshold voltage sensing period (B), a low-level gate signal SC1 can be provided to the gates of the first transistor T1 and the fourth transistor T4, a high-level second scan signal SC2 can be provided to the gates of the second transistor T2 and the third transistor T3, a high-level third scan signal SC3 can be provided to the gate of the fifth transistor T5, and a low-level transmit signal EM can be provided to the transmit transistor T6.

[0086] Therefore, the second transistor T2, the third transistor T3, and the fifth transistor T5 can be turned on, while the first transistor T1, the fourth transistor T4, and the emitter transistor T6 can be turned off.

[0087] In this case, the reference voltage Vref can be provided to the gate of the driving transistor Tdr through the second transistor T2, and the second driving voltage Vb can be provided to the first electrode of the light-emitting device ED.

[0088] Therefore, the gate N1 of the driving transistor Tdr can be initialized by the reference voltage Vref, the potential difference (=Vref-Vth) between the reference voltage Vref and the threshold voltage (Vth) of the driving transistor Tdr can be provided to the second terminal N2 of the driving transistor Tdr, and the first electrode of the light-emitting device ED can be initialized by the second driving voltage Vb.

[0089] In this case, the threshold voltage (Vth) of the driving transistor Tdr can be stored in the first capacitor C1, and 0V can be stored in the second capacitor C2.

[0090] In other words, during the threshold voltage sensing period (B), the threshold voltage (Vth) of the driving transistor Tdr can be stored in the first circuit section 1CU, particularly in the first capacitor C1. Specifically, during the threshold voltage sensing period (B), the threshold voltage of the driving transistor Tdr can be sensed and stored in the first circuit section 1CU.

[0091] In this case, the first electrode of the light-emitting device ED can be continuously initialized by the second driving voltage Vb from the initialization period (A) to the threshold voltage sensing period (B).

[0092] Next, refer to Figure 6 and Figure 9 During the data writing period (C), a high-level gate signal SC1 can be provided to the gates of the first transistor T1 and the fourth transistor T4, a low-level second scan signal SC2 can be provided to the gates of the second transistor T2 and the third transistor T3, a high-level third scan signal SC3 can be provided to the gate of the fifth transistor T5, and a low-level transmit signal EM can be provided to the transmit transistor T6.

[0093] Therefore, the first transistor T1, the fourth transistor T4, and the fifth transistor T5 can be turned on, while the second transistor T2, the third transistor T3, and the emitter transistor T6 can be turned off.

[0094] In this case, the data voltage Vdata can be supplied to the first capacitor C1 and the second capacitor C2 through the data line DL and the first transistor T1, the first driving voltage Va can be supplied to the second terminal of the driving transistor Tdr through the fourth transistor T4, and the second driving voltage Vb can be supplied to the first electrode of the light-emitting device ED.

[0095] Therefore, a voltage equal to the sum of the data voltage Vdata and the threshold voltage (Vth) can be provided to the gate N1 of the driving transistor Tdr, a voltage equal to the first driving voltage Va can be provided to the second terminal N2 of the driving transistor Tdr, and the first electrode of the light-emitting device ED can be initialized by the second driving voltage Vb.

[0096] In this case, the threshold voltage of the driving transistor Tdr can be stored in the first capacitor C1, and the potential difference (=Vdata-Va) between the data voltage Vdata and the first driving voltage Va can be stored in the second capacitor C2.

[0097] In other words, during the data writing period (C), the data voltage Vdata can be stored in the first circuit section 1CU, specifically in the second capacitor C2. In particular, during the data writing period (C), the data voltage Vdata can be stored in the first circuit section 1CU in the form of the potential difference (=Vdata-Va) between the data voltage Vdata and the first driving voltage Va.

[0098] In this case, as described above, the first capacitor (C1) can still store the threshold voltage (Vth) of the driving transistor Tdr stored during the threshold voltage sensing period (B).

[0099] Therefore, during the data writing period (C), both the data voltage Vdata and the threshold voltage (Vth) can be stored in the first circuit section 1CU.

[0100] Furthermore, the first electrode of the light-emitting device ED can be continuously initialized by the second driving voltage Vb from the initialization period (A) to the data writing period (C).

[0101] Next, refer to Figure 6 and Figure 10 During the reset period (D), a low-level gate signal SC1 can be provided to the gates of the first transistor T1 and the fourth transistor T4, a low-level second scan signal SC2 can be provided to the gates of the second transistor T2 and the third transistor T3, a high-level third scan signal SC3 can be provided to the gate of the fifth transistor T5, and a high-level transmit signal EM can be provided to the transmit transistor T6.

[0102] Therefore, the fifth transistor T5 and the emitter transistor T6 can be turned on, while the first transistor T1, the second transistor T2, the third transistor T3 and the fourth transistor T4 can be turned off.

[0103] In this case, the second driving voltage Vb can be provided to the second terminal N2 of the driving transistor Tdr through the emitting transistor T6, and the second driving voltage Vb can be provided to the first electrode of the light-emitting device ED.

[0104] Therefore, the voltage obtained by subtracting the first driving voltage Va from the sum of the threshold voltage (Vth), the data voltage Vdata, and the second driving voltage Vb is provided to the gate N1 of the driving transistor Tdr. The second terminal N2 of the driving transistor Tdr can be initialized by the second driving voltage Vb provided by the fifth transistor T5 and the sixth transistor T6, and the first electrode of the light-emitting device ED can be initialized by the second driving voltage Vb.

[0105] That is, during the reset period (D), the second node N2 of the driving transistor Tdr and the first electrode of the light-emitting device ED, which are electrically connected to each other through the emitting transistor T6, can be initialized by the second driving voltage Vb.

[0106] In this case, the first capacitor C1 can store the threshold voltage of the driving transistor Tdr, and the second capacitor C2 can store the potential difference (=Vdata-Va) between the data voltage Vdata and the first driving voltage Va. In addition, the third capacitor Cled can store the potential difference (=Vb-ELVSS) between the second driving voltage Vb and the second voltage ELVSS.

[0107] The voltage stored in the third capacitor Coled (=Vb-ELVSS) can be the pre-charge voltage and can be lower than the voltage of the first electrode that enables the light-emitting device ED to conduct. Therefore, during the reset period (D), light cannot be emitted from the light-emitting device ED.

[0108] Furthermore, the first electrode of the light-emitting device ED can be continuously initialized by the second driving voltage Vb from the initialization period (A) to the reset period (D).

[0109] Finally, refer to Figure 6 and Figure 11 During the light emission period (E), a low-level gate signal SC1 can be provided to the gates of the first transistor T1 and the fourth transistor T4, a low-level second scan signal SC2 can be provided to the gates of the second transistor T2 and the third transistor T3, a low-level third scan signal SC3 can be provided to the gate of the fifth transistor T5, and a high-level emission signal EM can be provided to the emission transistor T6.

[0110] Therefore, the emitting transistor T6 can be turned on, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4, and the fifth transistor T5 can be turned off, and the driving transistor Tdr can be turned on. Thus, current can flow through the driving transistor Tdr, the emitting transistor T6, and the light-emitting device ED, and therefore, light can be emitted from the light-emitting device ED.

[0111] In this case, the voltage obtained by subtracting the first driving voltage Va from the sum of the threshold voltage (Vth), the data voltage Vdata, and the voltage Voled supplied to the first electrode of the light-emitting device ED can be supplied to the gate N1 of the driving transistor Tdr, and the voltage Voled supplied to the first electrode of the light-emitting device ED can be supplied to the second terminal N2 of the driving transistor Tdr.

[0112] Furthermore, the threshold voltage of the driving transistor Tdr can be stored in the first capacitor C1, and the potential difference (=Vdata-Va) between the data voltage Vdata and the first driving voltage Va can be stored in the second capacitor C2.

[0113] The current Ioled flowing through the light-emitting device ED during the light-emitting period (E) can be proportional to the square of the voltage obtained by subtracting the threshold voltage (Vth) of the driving transistor Tdr from the potential difference between the gate N1 and the source (second terminal) of the driving transistor Tdr (hereinafter referred to as the gate-source voltage (Vgs)), as shown in [Equation 1].

[0114] [Equation 1]

[0115] In [Equation 1], considering the mobility, channel width and channel length of the driving transistor Tdr, k can be a constant.

[0116] In the above example, the gate-source voltage (Vgs) of the driving transistor Tdr can be shown as [Equation 2].

[0117] [Equation 2]

[0118] In this case, the gate-source voltage (Vgs) of the driving transistor Tdr can be equal to the sum of the voltage stored in the first capacitor C1 (e.g., the threshold voltage (Vth)) and the voltage stored in the second capacitor C2 (e.g., the data voltage Vdata - the first driving voltage Va) (=Vth+Vdata-Va).

[0119] Therefore, the voltage obtained by subtracting the threshold voltage (Vth) of the driving transistor Tdr from the gate-source voltage (Vgs) of the driving transistor Tdr can be expressed as [Equation 3].

[0120] [Equation 3]

[0121] Therefore, according to Equations 1 and 3, the current Ioled flowing through the light-emitting device ED can be proportional to the square of the potential difference between the data voltage Vdata and the first driving voltage Va.

[0122] Therefore, in the light-emitting display device according to the embodiments of the present disclosure, the magnitude of the current Ioled flowing through the light-emitting device ED is independent of the threshold voltage (Vth) of the driving transistor Tdr and can be determined by the data voltage Vdata and the first driving voltage Va.

[0123] The brightness of the light emitted from the light-emitting device ED can be determined by the amount of current Ioled flowing through the light-emitting device ED.

[0124] Therefore, even if the driving transistor Tdr deteriorates due to long-term use of the light-emitting display device according to the embodiments of the present disclosure, the brightness of the light output from the light-emitting device ED can be changed only by the data voltage Vdata and the first driving voltage Va, and is not affected by the threshold voltage Vth of the driving transistor Tdr.

[0125] Therefore, the quality of the light-emitting display device according to the embodiments of this disclosure can be maintained for a long time.

[0126] Figures 12 to 14 These are further example diagrams illustrating the structure of pixels applied to an embodiment of a light-emitting display device according to this disclosure, and Figure 15 It is shown that it is provided to Figure 13 and Figure 14 An example diagram of the signal waveform of the pixel shown. In the following description, descriptions of the referenced pixels are omitted or briefly omitted. Figures 1 to 11 The details described are the same or similar.

[0127] first, Figure 12 The structure of the pixel driving circuit PDC shown is similar to Figure 2 The pixel driving circuit PDC shown has the same structure.

[0128] In this case, the reference voltage Vref can be used as the first driving voltage Va. For example, the reference voltage Vref can be provided to the second transistor T2, and can also be provided to the second terminal N2 of the driving transistor Tdr through the fourth transistor T4.

[0129] Therefore, when using Figure 12 In the pixel driving circuit PDC shown, pixel P may only include a first driving voltage line 1DVL supplied with a first driving voltage Va, and a separate reference voltage supply line RVL may not be necessary. That is, when the first driving voltage line 1DVL is connected to the second transistor T2, the first driving voltage line 1DVL can be used as the reference voltage supply line RVL.

[0130] Therefore, and connected to it, it is applied Figure 2 Compared to the number of lines connected to pixel P in a light-emitting display device, the number of lines connected to pixel P can be reduced. Figure 12 The number of lines of pixel P in the light-emitting display device shown for pixel P can be reduced, thus further simplifying the structure of the light-emitting display panel 100.

[0131] Next, in Figure 13 In the pixel driving circuit PDC shown, and Figure 2 Compared to the pixel driving circuit PDC shown, an auxiliary emitter transistor T7 is also provided, which is connected between the first voltage supply line PLA, which is supplied with the first voltage ELVDD, and the driving transistor Tdr.

[0132] For example, the first terminal of the auxiliary emitter transistor T7 can be connected to the first voltage supply line PLA, the second terminal of the auxiliary emitter transistor T7 can be connected to the first terminal of the driving transistor Tdr, and the auxiliary emitter signal EM1 can be provided to the gate of the auxiliary emitter transistor T7.

[0133] The auxiliary emitter transistor T7 can be turned off during the initialization period (A) when the driving transistor Tdr and the light-emitting device ED are initialized by the second driving voltage Va.

[0134] For example, such as Figure 13 and Figure 15 As shown, during the initialization period (A) and the data write period (C), a low-level auxiliary emitter signal EM1 can be provided to the gate of the auxiliary emitter transistor T7, and therefore, the auxiliary emitter transistor T7 can be turned off during the initialization period (A) and the data write period (C). The auxiliary emitter transistor T7 can also be turned off during the reset period (D).

[0135] Therefore, leakage current through the first voltage supply line PLA can be prevented during the initialization period (A), data writing period (C), and reset period (D).

[0136] Therefore, during the initialization period (A), the driving transistor Tdr and the light-emitting device ED can be accurately initialized by the second driving voltage Vb, during the data writing period (C), the data voltage Vdata can be accurately stored, and during the reset period (D), the second terminal of the driving transistor Tdr and the first electrode of the light-emitting device ED can be accurately initialized by the second driving voltage Vb.

[0137] at last, Figure 14 The structure of the pixel driving circuit PDC shown is similar to Figure 13 The pixel driving circuit PDC shown has the same structure.

[0138] In this case, the reference voltage Vref can be used as the first driving voltage Va.

[0139] Therefore, when using Figure 14 When the pixel driving circuit PDC is shown, pixel P may only include the first driving voltage line 1DVL which is provided with the first driving voltage Va, and does not require a separate reference voltage supply line RVL.

[0140] Therefore, in application Figure 14 In the display device showing pixel P, and with the application of Figure 13 Compared to the display device with pixel P shown, the number of lines connected to pixel P can be reduced, thereby simplifying the structure of the display panel 100.

[0141] In addition, with Figure 2 Compared to the pixel driving circuit PDC shown, in Figure 14 The pixel driving circuit PDC shown also includes an auxiliary emitter transistor T7 connected between the first voltage supply line PLA, which provides the first voltage ELVDD, and the driving transistor Tdr.

[0142] Therefore, as referenced Figure 13 As mentioned above, in the application Figure 14 In the display device with pixel P shown, during the initialization period (A), the data writing period (C), and the reset period (D), a low-level auxiliary emission signal EM1 can be provided to the gate of the auxiliary emission transistor T7, and therefore, the auxiliary emission transistor T7 can be turned off during the initialization period (A), the data writing period (C), and the reset period (D).

[0143] Therefore, leakage current through the first voltage supply line PLA can be prevented during the initialization period (A), data writing period (C), and reset period (D).

[0144] Therefore, during the initialization period (A), the driving transistor Tdr and the light-emitting device ED can be accurately initialized by the second driving voltage Vb, during the data writing period (C), the data voltage Vdata can be accurately stored, and during the reset period (D), the second terminal of the driving transistor Tdr and the first electrode of the light-emitting device ED can be accurately initialized by the second driving voltage Vb.

[0145] Figures 16A to 16D This is an example diagram illustrating the effect of a change in the magnitude of a second driving voltage applied to a display device according to an embodiment of this disclosure.

[0146] In the following, various features of the display device according to embodiments of the present disclosure will be described.

[0147] First, as described above, the current Ioled flowing through the light-emitting device ED can be controlled by the data voltage Vdata and the first driving voltage Va, and is not affected by the threshold voltage (Vth) of the driving transistor Tdr. In this case, the first driving voltage Va can be fixed at a constant level.

[0148] Therefore, the brightness of the light-emitting device ED is not affected by the threshold voltage (Vth) of the driving transistor Tdr, and can only be controlled by the data voltage Vdata.

[0149] In this scenario, if the current Ioled flowing to the light-emitting device ED is affected by a threshold voltage (Vth), as in the past, then considering the magnitude and variation of the threshold voltage (Vth), a data voltage Vdata must be generated over a wide range from negative to positive values. Therefore, the data driver must be designed to generate a data voltage ranging from negative to positive values. This may require a complex structure for the data driver.

[0150] However, in the display device according to embodiments of the present disclosure, because the current Ioled flowing through the light-emitting device ED is not affected by the threshold voltage (Vth), the range of the data voltage Vdata can be narrower than in the conventional case. In particular, according to embodiments of the present disclosure, the data voltage Vdata can be one of the positive values. Therefore, the data driver 300 can generate the data voltage Vdata using only positive voltages. That is, the data voltage Vdata provided through the data line DL can have a voltage greater than 0.

[0151] Therefore, the structure of the data driver 300 applied to the display device according to the embodiments of the present disclosure is simpler than that of a conventional data driver designed to generate both negative and positive data voltages, thereby reducing the manufacturing cost of the display device.

[0152] Next, during the initialization period (A), the first circuit section 1CU and the second circuit section 2CU can be electrically connected through the emitter transistor T6, and the drive transistor Tdr and the light-emitting device ED can be simultaneously initialized by the second drive voltage Vb.

[0153] Therefore, the initialization of the driving transistor Tdr and the light-emitting device ED can be performed simply.

[0154] Specifically, in the display device according to embodiments of the present disclosure, the first electrode of the light-emitting device ED can be continuously initialized by the second driving voltage Vb during an initialization period (A), a threshold voltage sensing period (B), a data writing period (C), and a reset period (D). Therefore, the possibility of abnormal light output from the light-emitting device can be reduced.

[0155] Next, during the threshold voltage sensing period (B), the first circuit section 1CU and the second circuit section 2CU can be electrically isolated by the emitter transistor T6, and the threshold voltage (Vth) of the driving transistor Tdr can be stored in the first circuit section 1CU.

[0156] Additionally, during the data writing period (C), the first circuit section 1CU and the second circuit section 2CU can be electrically isolated by the emitter transistor T6, and the data voltage Vdata supplied by the data line DL can be stored in the first circuit section 1CU.

[0157] In other words, during the threshold voltage sensing period (B) and the data writing period (C), the first circuit section 1CU can be electrically isolated from the second circuit section 2CU. Therefore, the operation methods during the threshold voltage sensing period (B) and the data writing period (C) can be changed differently.

[0158] Furthermore, the threshold voltage sensing period (B) and the data writing period (C) can also be performed independently. Therefore, regardless of the data writing period (C), the threshold voltage sensing period (B) can be set to various lengths.

[0159] For example, as the threshold voltage sensing period (B) increases, the threshold voltage (Vth) can be sensed more accurately.

[0160] Therefore, in the display device according to the embodiments of the present disclosure, the threshold voltage sensing period (B) can be increased in different ways, thereby enhancing the threshold voltage sensing function and improving the quality of the display device.

[0161] Next, during the emission period (E), the first circuit section 1CU and the second circuit section 2CU can be electrically connected through the emitting transistor T6, and light can be emitted from the light-emitting device ED through the current Ioled provided from the driving transistor Tdr via the emitting transistor T6.

[0162] Specifically, as described above, during the reset period (D) immediately preceding the light-emitting period (E), the second terminal N2 of the driving transistor Tdr and the first electrode of the light-emitting device ED can be simultaneously initialized by the second driving voltage Vb.

[0163] Therefore, during the light emission period (E) that occurs after the reset period (D), there is no voltage difference between the second terminal N2 of the driving transistor Tdr and the first electrode of the light emission device ED.

[0164] Since no voltage difference occurs between the second terminal N2 of the driving transistor Tdr and the first electrode of the light-emitting device ED during the light-emitting period (E), the rise time or fall time of the voltage at the first electrode of the light-emitting device ED can be constant. Therefore, the period or timing of light output from the light-emitting device ED can always be maintained, thereby improving the quality of the display device.

[0165] Finally, in order to initialize the light-emitting device ED, the second driving voltage Vb supplied to the first electrode of the light-emitting device ED can be set to be lower than the voltage of the first electrode that allows light to be emitted from the light-emitting device ED (hereinafter referred to as the anode voltage).

[0166] Therefore, even at low gray levels, light can be rapidly output from the light-emitting device (ED). Furthermore, even as the brightness changes from high to low gray levels, the size or intensity of the light output from the ED can be quickly adjusted. Additionally, current errors can be reduced.

[0167] As described above, the anode of the light-emitting device ED can be the first electrode of the light-emitting device ED. Furthermore, the second driving voltage Vb can be the initialization voltage.

[0168] For example, during the light emission period (E), an anode voltage capable of emitting light from the light-emitting device ED should be applied to the first electrode of the light-emitting device ED to output light from the light-emitting device ED.

[0169] In this case, if the light-emitting device ED is not initialized to a specific voltage (e.g., a first driving voltage), the anode voltage of the first electrode of the light-emitting device ED gradually increases, and light can only be output from the light-emitting device ED when a voltage higher than or equal to the anode voltage that enables light output is provided to the first electrode.

[0170] In this situation, due to differences in the characteristics of the light-emitting device or the driving transistor Tdr, the rise time of the anode voltage may vary depending on the gray level, or the rise time of the anode voltage may differ for each light-emitting device. Therefore, even for the same gray level, the light output timing may differ. This can lead to brightness differences. This difference may be more pronounced at lower gray levels.

[0171] However, in the display device according to the embodiments of this disclosure, the first electrode of the light-emitting device ED can be initialized by the second driving voltage Vb, thereby shortening the voltage rise time of the first electrode. Therefore, errors in the voltage rise time can be reduced. Thus, the quality of the display device can be improved. That is, the second driving voltage Vb can be the pre-charge voltage of the first electrode.

[0172] For example, Figure 16A and Figure 16B This is a graph showing the change in voltage (e.g., anode voltage) of the first electrode when a second driving voltage Vb of -5V and -3V is applied. According to the graph, light can be emitted from the light-emitting device when the anode voltage is approximately -2V.

[0173] In this case, the period of light emission from the light-emitting device can be shorter when the second driving voltage Vb is -3V compared to when the second driving voltage Vb is -5V. This means that when the second driving voltage Vb is close to the anode voltage at which light can be emitted, the light emission period can be shorter.

[0174] Furthermore, when the first electrode of the light-emitting device ED is initialized by the second driving voltage Vb, the intensity or magnitude of the light output from the light-emitting device can be quickly adjusted even when the brightness changes from a high gray level to a low gray level.

[0175] For example, if the first electrode of the light-emitting device (ED) is not initialized, the voltage of the first electrode should decrease when transitioning from a high gray level to a low gray level. This may increase the time until the low gray level light is output.

[0176] However, in the display device according to the embodiments of the present disclosure, after outputting high grayscale light, since the first electrode of the light-emitting device ED can be initialized by the second driving voltage Vb, low grayscale light can be quickly output even after the high grayscale level.

[0177] In other words, by adjusting the second driving voltage Vb, the difference in light emission delay time can be reduced.

[0178] also, Figure 16C and Figure 16D This is a graph showing the current error when a second drive voltage Vb of -5V and -3V is applied.

[0179] For example, according to Figure 16C and Figure 16D When a second driving voltage Vb of -3V is applied, the current error can be smaller.

[0180] The features of the light-emitting display device according to embodiments of this disclosure are briefly summarized below.

[0181] An embodiment of the light-emitting display device according to the present disclosure includes: a light-emitting device configured to emit light; and a pixel driving circuit configured to drive the light-emitting device, wherein the pixel driving circuit includes: a first circuit portion including a driving transistor and connected to a data line and a first driving voltage line, wherein a first driving voltage is provided to the first driving voltage line; a second circuit portion connected to the light-emitting device and a second driving voltage line, wherein a second driving voltage is provided to the second driving voltage line; and an emitting transistor connected between the first circuit portion and the second circuit portion.

[0182] The current flowing through the light-emitting device is controlled by the data voltage and the first driving voltage.

[0183] During the initialization period, the first circuit section and the second circuit section are electrically connected through the emitter transistor, and the drive transistor and the light-emitting device are initialized by the second drive voltage.

[0184] During the threshold voltage sensing period, the first circuit section and the second circuit section are electrically isolated by the emitter transistor, and the threshold voltage driving the transistor is stored in the first circuit section.

[0185] During the data writing period, the first circuit section and the second circuit section are electrically isolated by the emitter transistor, and the data voltage provided by the data line is stored in the first circuit section.

[0186] During the data writing period, the light-emitting device is initialized by the second circuit section.

[0187] During the reset period, the first circuit section and the second circuit section are electrically connected through the emitter transistor, and the driver transistor and the light-emitting device are initialized by the second circuit section.

[0188] During the reset period, the driving transistor and the light-emitting device are initialized by the second driving voltage.

[0189] During the light-emitting period, the first circuit section and the second circuit section are electrically connected through the emitting transistor, and light is emitted from the light-emitting device by the current supplied from the driving transistor via the emitting transistor.

[0190] The pixel driving circuit also includes an auxiliary emitter transistor connected between a first voltage supply line, which is supplied with a first voltage, and the driving transistor.

[0191] During the initialization period when the driving transistor and the light-emitting device are initialized by the second driving voltage, the auxiliary emitting transistor is turned off.

[0192] The second driving voltage is lower than the anode voltage that makes the light-emitting device emit light.

[0193] The data voltage provided by the data line is greater than 0.

[0194] The light-emitting device is initialized by the second circuit section during the initialization period when the driving transistor is initialized, during the threshold voltage sensing period when the threshold voltage of the driving transistor is sensed, during the data writing period when the data voltage is provided through the data line, and during the reset period between the data writing period and the light emission period.

[0195] The first circuit portion includes: a driving transistor including a first terminal connected to a first voltage supply line; a first transistor including a first terminal connected to a data line; a first capacitor connected between the gate of the driving transistor and a second terminal of the first transistor; a second transistor connected between a reference voltage supply line and the gate of the driving transistor; a third transistor connected between a second terminal of the first transistor and a second terminal of the driving transistor; a second capacitor connected between a second terminal of the first transistor and a second terminal of the driving transistor; and a fourth transistor connected between a first driving voltage line and a second terminal of the driving transistor, wherein an emitter transistor is connected between the second terminal of the driving transistor and the second circuit portion.

[0196] The second circuit section includes: a fifth transistor connected between the second driving voltage line and the first terminal of the light-emitting device; and a third capacitor connected between the first terminal and the second terminal of the light-emitting device, wherein the emitting transistor is connected between the first circuit section and the first terminal of the light-emitting device.

[0197] The light-emitting display device according to this disclosure can be applied to all electronic devices that need to display images. For example, the light-emitting display device according to this disclosure can be applied to virtual reality (VR) devices, augmented reality (AR) devices, mobile devices, video phones, smartwatches, watch phones, or wearable devices, foldable devices, rollable devices, bendable devices, flexible devices, bending devices, electronic notebooks, e-books, PMPs (portable multimedia players), PDAs (personal digital assistants), MP3 players, mobile medical devices, desktop PCs, laptop PCs, netbooks, workstations, navigation systems, car navigation systems, vehicle display devices, televisions, wallpaper display devices, signage devices, gaming devices, laptop computers, monitors, cameras, camcorders, and home appliances.

[0198] According to embodiments of the present disclosure, light corresponding to a data voltage can be emitted from the light-emitting device regardless of the threshold voltage of the driving transistor. Therefore, the quality of the light-emitting display device can be improved.

[0199] According to embodiments of the present disclosure, the light-emitting display device can be driven using only a data voltage with a positive value. Therefore, it is unnecessary to manufacture a data driver for outputting data voltages of various levels, and thus, it is unnecessary to consider new structures for the data driver.

[0200] According to the embodiments of the present disclosure, the light-emitting display device can reduce the possibility of abnormal light output from the light-emitting device because the light-emitting device can be continuously initialized.

[0201] According to embodiments of the present disclosure, in a light-emitting display device, the first electrode of the light-emitting device can be initialized with a voltage lower than that required for the light-emitting device to emit light. Therefore, even at low gray levels, light can be emitted rapidly from the light-emitting device, and even when the brightness changes from a high gray level to a low gray level, light can be output rapidly from the light-emitting device, thereby reducing current errors between gray levels.

[0202] The features, structures, and effects described above in this disclosure are included in at least one embodiment of this disclosure, but are not limited to only one embodiment. Furthermore, the features, structures, and effects described in at least one embodiment of this disclosure can be achieved by combinations or modifications of other embodiments by those skilled in the art. Therefore, content associated with combinations and modifications should be interpreted as being within the scope of this disclosure.

[0203] It will be apparent to those skilled in the art that various modifications and changes can be made to this disclosure without departing from its spirit or scope. Therefore, this disclosure is intended to cover any modifications and changes to this disclosure that fall within its scope.

Claims

1. A light-emitting display device, comprising: A light-emitting device, the light-emitting device being configured to emit light; as well as A pixel driving circuit configured to drive the light-emitting device. The pixel driving circuit includes: A first circuit portion, the first circuit portion including a driving transistor and connected to a data line and a first driving voltage line, the first driving voltage being provided to the first driving voltage line; A second circuit section is connected to the light-emitting device and the second driving voltage line, and a second driving voltage is provided to the second driving voltage line; and An emitter transistor is connected between the first circuit section and the second circuit section.

2. The light-emitting display device according to claim 1, wherein The current flowing through the light-emitting device is controlled by the data voltage and the first driving voltage.

3. The light-emitting display device according to claim 1, wherein During the initialization period, the first circuit portion and the second circuit portion are electrically connected through the emitting transistor, and the driving transistor and the light-emitting device are initialized by the second driving voltage.

4. The light-emitting display device according to claim 1, wherein During the threshold voltage sensing period, the first circuit portion and the second circuit portion are electrically isolated by the emitter transistor, and the threshold voltage of the drive transistor is stored in the first circuit portion.

5. The light-emitting display device according to claim 1, wherein During the data writing period, the first circuit portion and the second circuit portion are electrically isolated by the emitter transistor, and the data voltage provided by the data line is stored in the first circuit portion.

6. The light-emitting display device according to claim 5, wherein During the data writing period, the light-emitting device is initialized by the second circuit section.

7. The light-emitting display device according to claim 1, wherein, During the reset period, the first circuit portion and the second circuit portion are electrically connected through the emitting transistor, and the driving transistor and the light-emitting device are initialized by the second circuit portion.

8. The light-emitting display device according to claim 7, wherein, During the reset period, the driving transistor and the light-emitting device are initialized by the second driving voltage.

9. The light-emitting display device according to claim 1, wherein, During the light-emitting period, the first circuit portion and the second circuit portion are electrically connected through the emitting transistor, and light is emitted from the light-emitting device by the current supplied from the driving transistor via the emitting transistor.

10. The light-emitting display device according to claim 1, wherein, The pixel driving circuit also includes an auxiliary emitter transistor connected between a first voltage supply line, which is supplied with a first voltage, and the driving transistor.

11. The light-emitting display device according to claim 10, wherein, During the initialization period when the driving transistor and the light-emitting device are initialized by the second driving voltage, the auxiliary emitting transistor is turned off.

12. The light-emitting display device according to claim 1, wherein, The second driving voltage is lower than the anode voltage that causes the light-emitting device to emit light.

13. The light-emitting display device according to claim 5, wherein, The data voltage provided through the data line is greater than 0.

14. The light-emitting display device according to claim 1, wherein, The light-emitting device is initialized by the second circuit portion during the initialization period when the driving transistor is initialized, during the threshold voltage sensing period when the threshold voltage of the driving transistor is sensed, during the data writing period when the data voltage is provided through the data line, and during the reset period between the data writing period and the light emission period.

15. The light-emitting display device according to claim 1, wherein, The first circuit section includes: A driving transistor, the driving transistor including a first terminal connected to a first voltage supply line; A first transistor, the first transistor including a first terminal connected to the data line; A first capacitor is connected between the gate of the driving transistor and a second terminal of the first transistor; The second transistor is connected between the reference voltage supply line and the gate of the driving transistor; A third transistor is connected between the second terminal of the first transistor and the second terminal of the driving transistor; A second capacitor is connected between the second terminal of the first transistor and the second terminal of the driving transistor; and A fourth transistor is connected between the first drive voltage line and the second terminal of the drive transistor. The emitter transistor is connected between the second terminal of the drive transistor and the second circuit portion.

16. The light-emitting display device according to claim 1, wherein, The second circuit section includes: A fifth transistor, the fifth transistor being connected between the second driving voltage line and the first terminal of the light-emitting device; and A third capacitor is connected between the first terminal and the second terminal of the light-emitting device. The emitting transistor is connected between the first circuit section and the first terminal of the light-emitting device.

Images