Display device

Abstract

The invention relates to a display device. The display device includes: a first pixel including a first organic light emitting diode; an initialization voltage generator for generating a first initialization voltage to be supplied to an anode of the first organic light emitting diode; and a timing controller including a first lookup table in which a plurality of first initialization voltage values corresponding to the plurality of maximum brightnesses are recorded, the timing controller being configured to determine a value of the first initialization voltage based on the reception information related to the target maximum brightness and the first lookup table.

Description

[0001] This application is a divisional application of the application with the application date of October 11, 2018, the application number of 202211048196.2, and the name of "Display apparatus".

[0002] Related Application Cross-Reference

[0003] This application claims priority to and the benefit of Korean Patent Application No. 10-2017-0144924, filed on November 1, 2017, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD

[0004] Aspects of some example embodiments of the present disclosure relate to a display apparatus and a driving method thereof. BACKGROUND

[0005] With the development of information technology, the importance of a display apparatus, which is a medium for connecting users and information, has increased. Accordingly, display apparatuses such as liquid crystal display apparatuses, organic light emitting display apparatuses, and plasma display panels are being increasingly used.

[0006] Among these display apparatuses, an organic light emitting display apparatus displays an image using an organic light emitting diode that generates light through the recombination of electrons and holes. The organic light emitting display apparatus has a relatively high response speed and is driven with relatively low power consumption.

[0007] The organic light emitting display apparatus displays a target image to a user by writing a data voltage for representing a target gray scale in each pixel and allowing a plurality of organic light emitting diodes to emit light corresponding to the data voltage.

[0008] Generally, the plurality of organic light emitting diodes are configured with a red organic light emitting diode, a blue organic light emitting diode, and a green organic light emitting diode. Since the organic materials of the organic light emitting diodes have different bandgaps, the plurality of organic light emitting diodes emit light having different wavelengths.

[0009] The amount of driving current supplied to the organic light emitting diodes of the plurality of colors can be differently set according to the emission efficiency of such organic materials. For example, a relatively small driving current can be supplied to the organic light emitting diode of a color having an organic material with high emission efficiency.

[0010] However, in a low brightness condition in which the size of the driving current is very small, a relatively long period of time can be required to charge the capacitor of the corresponding organic light emitting diode, and thus, a color lag phenomenon in which the corresponding organic light emitting diode emits light later than the organic light emitting diodes of other colors can occur.

[0011] The above-described information disclosed in this Background section is only for enhancing the understanding of the background art. Therefore, the above-described information can contain information that does not constitute the prior art. SUMMARY

[0012] Some example embodiments include a display apparatus capable of eliminating or mitigating a color washout phenomenon by controlling an initialization voltage according to a luminance condition and a driving method of the display apparatus.

[0013] According to some example embodiments of the disclosure, a display apparatus includes a first pixel including a first organic light emitting diode, an initialization voltage generator configured to generate a first initialization voltage to be supplied to an anode of the first organic light emitting diode, and a timing controller including a first lookup table in which a plurality of first initialization voltage values corresponding to a plurality of maximum luminances are recorded, the timing controller being configured to determine a value of the first initialization voltage based on received information about a target maximum luminance and the first lookup table.

[0014] The plurality of first initialization voltage values can be obtained by adding a first offset value to a value of a first power voltage to be supplied to a cathode of the first organic light emitting diode.

[0015] Each of the first offset values can be inversely proportional to a size of a corresponding maximum luminance.

[0016] The plurality of maximum luminances can include a reference maximum luminance. The first offset value at the reference maximum luminance can be 0.

[0017] The first offset values corresponding to a first group of maximum luminances exceeding the reference maximum luminance among the plurality of maximum luminances can be less than 0.

[0018] The first offset values corresponding to a second group of maximum luminances less than the reference maximum luminance among the plurality of maximum luminances can be greater than 0.

[0019] The first power voltage can be inversely proportional to a size of the target maximum luminance.

[0020] The first power voltage can have a certain voltage value when the target maximum luminance corresponds to the reference maximum luminance, and have a voltage value lower than the certain voltage value when the target maximum luminance corresponds to the first group of maximum luminances.

[0021] The first power voltage can have a voltage value equal to or greater than the certain voltage value when the target maximum luminance corresponds to the second group of maximum luminances.

[0022] A second power voltage to be supplied to the anode of the first organic light emitting diode can have a fixed value regardless of the target maximum luminance.

[0023] The display device can further include a second pixel including a second organic light emitting diode having an organic material with a band gap different from that of the organic material of the first organic light emitting diode. The timing controller can further include a second lookup table in which a plurality of second initialization voltage values corresponding to the plurality of maximum luminances are recorded, and can be configured to determine a value of the second initialization voltage based on the received information about the target maximum luminance and the second lookup table. The initialization voltage generator can be configured to generate the second initialization voltage to be supplied to an anode of the second organic light emitting diode.

[0024] The plurality of first initialization voltage values can be obtained by adding a first offset value to a value of the first power voltage to be supplied to the cathode of the first organic light emitting diode, and the plurality of second initialization voltage values can be obtained by adding a second offset value to a value of the first power voltage to be supplied to the cathode of the second organic light emitting diode.

[0025] The plurality of maximum luminances can include a reference maximum luminance. The first offset value and the second offset value at the reference maximum luminance can be 0.

[0026] The first offset value corresponding to a first maximum luminance group exceeding the reference maximum luminance among the plurality of maximum luminances can be less than 0, and the second offset value corresponding to the first maximum luminance group can be less than the first offset value.

[0027] The first offset value corresponding to a second maximum luminance group less than the reference maximum luminance among the plurality of maximum luminances can be greater than 0, and the second offset value corresponding to the second maximum luminance group can be less than the first offset value.

[0028] The first power voltage can have a certain voltage value when the target maximum luminance corresponds to the reference maximum luminance, and the first power voltage can have a voltage value lower than the certain voltage value when the target maximum luminance corresponds to the first maximum luminance group.

[0029] The first power voltage can have a voltage value equal to or greater than the certain voltage value when the target maximum luminance corresponds to the second maximum luminance group.

[0030] The second power voltage supplied to the anodes of the first organic light emitting diode and the second organic light emitting diode can have a fixed value regardless of the target maximum luminance.

[0031] According to aspects of the present disclosure, there are provided a method for driving a display apparatus, the method including: receiving, by a timing controller, information related to a target maximum luminance; determining, by the timing controller, a value of a first initialization voltage corresponding to the target maximum luminance using a first lookup table constructed in the timing controller; initializing, by an initialization voltage generator, an amount of charge accumulated in a first organic light emitting diode of a first pixel by supplying the first initialization voltage to an anode of the first organic light emitting diode; and allowing the first organic light emitting diode to emit light corresponding to a target gray level having a luminance equal to or less than the target maximum luminance.

[0032] A plurality of first initialization voltage values corresponding to a plurality of maximum luminances can be recorded in the first lookup table. The plurality of first initialization voltage values can be obtained by adding a first offset value to a value of a first power voltage to be supplied to a cathode of the first organic light emitting diode. BRIEF DESCRIPTION OF DRAWINGS

[0033] Aspects of some example embodiments will now be described more fully with reference to the accompanying drawings; however, these embodiments can 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 the example embodiments to those skilled in the art.

[0034] In the drawings, the size of some of the elements can be exaggerated for clarity. It will be understood that when an element is referred to as being "between" two elements, it can be the only element between these two elements or one or more intervening elements can also be present. Like reference numerals refer to like elements throughout.

[0035] Figure 1 FIG. 1 is a diagram illustrating a display apparatus according to some example embodiments of the present application.

[0036] Figure 2 FIG. 2 is a diagram illustrating a first pixel according to some example embodiments of the present application.

[0037] Figure 3 FIG. 3 is a diagram illustrating a first initialization voltage when a target maximum luminance is equal to a reference maximum luminance according to some example embodiments of the present application.

[0038] Figure 4 FIG. 4 is a diagram illustrating a first initialization voltage when a target maximum luminance is greater than a reference maximum luminance according to some example embodiments of the present application.

[0039] Figure 5 FIG. 5 is a diagram illustrating a first initialization voltage when a target maximum luminance is less than a reference maximum luminance according to some example embodiments of the present application.

[0040] Figure 6 is a graph illustrating an example of a first initialization voltage, a first power voltage, and a second power voltage according to a target maximum luminance according to some example embodiments of the present application.

[0041] Figure 7 is a graph illustrating a display apparatus according to some example embodiments of the present application.

[0042] Figure 8 is a graph illustrating an embodiment of a pixel unit according to some example embodiments of the present application.

[0043] Figure 9 is a graph illustrating another embodiment of a pixel unit according to some example embodiments of the present application.

[0044] Figure 10 is a graph illustrating a color drag phenomenon.

[0045] Figure 11 is a graph illustrating a first pixel and a second pixel according to some example embodiments of the present application.

[0046] Figure 12 is a graph illustrating a first initialization voltage and a second initialization voltage when a target maximum luminance is equal to a reference maximum luminance according to some example embodiments of the present application.

[0047] Figure 13 is a graph illustrating a first initialization voltage and a second initialization voltage when a target maximum luminance is greater than a reference maximum luminance according to some example embodiments of the present application.

[0048] Figure 14 is a graph illustrating a first initialization voltage and a second initialization voltage when a target maximum luminance is less than a reference maximum luminance according to some example embodiments of the present application. DETAILED DESCRIPTION

[0049] Hereinafter, aspects of some example embodiments are described in more detail with reference to the accompanying drawings so that those skilled in the art can easily practice the present disclosure. The present disclosure can be implemented in various different forms and is not limited to the example embodiments described in this specification.

[0050] To clearly describe the present disclosure, certain irrelevant or repetitive descriptions can be omitted, and throughout the specification, the same reference numerals designate the same or similar constituent elements. Accordingly, the same reference numerals can be used in different drawings to identify the same or similar elements.

[0051] In addition, in order to better understand and facilitate description, the size and thickness of each component illustrated in the drawings are arbitrarily shown, but the present disclosure is not limited thereto. The thickness of several portions and regions is exaggerated for clarity of expression.

[0052] Figure 1 FIG. 1 is a diagram illustrating a display apparatus according to some example embodiments of the present application.

[0053] Referring to Figure 1 A display apparatus according to some example embodiments of the present application includes a processor 9, a driving IC 10, a scan driver 20, an emission control driver 30, a pixel unit 40, and a DC-DC converter 50. The driving IC 10 can include a timing controller 11, an initialization voltage generator 12, and a data driver 13.

[0054] The processor 9 can be a general-purpose processing apparatus. For example, the processor 9 can be an application processor (AP) of a mobile phone. As another example, the processor 9 can be a host system.

[0055] The processor 9 can supply a control signal and an image signal required to display an image to the driving IC 10. For example, the control signal can include a data enable signal, a vertical synchronization signal, a horizontal synchronization signal, a target maximum luminance, etc.

[0056] The target maximum luminance can be a luminance to be displayed at a maximum gray scale in the current display apparatus. When a gray scale of one pixel in an image signal for one frame is defined as a unit image data, the unit image data can have, for example, 8 bits. When the unit image data has 8 bits, 256 gray scales can be expressed. The minimum gray scale (gray scale 0) can be the darkest, and the maximum gray scale (gray scale 255) can be the brightest. At this time, when all the pixels of the pixel unit 40 emit light having the maximum gray scale, the luminance can be defined as the target maximum luminance.

[0057] According to some example embodiments of the present application, a unit of the target maximum luminance is designated as nit. That is, the pixel unit 40 can display an image that is partially (spatially) dark and bright according to an image signal, or an image that is dark and bright according to a frame (time). However, the maximum luminance of the image is limited by the target maximum luminance.

[0058] The target maximum luminance can be manually set when a user manipulates the display apparatus, or automatically set using an algorithm linked with an illuminance sensor, etc.

[0059] The timing controller 11 converts the control signal and the image signal supplied from the processor 9 to be suitable for the specifications of the driving IC 10, and supplies the required control signal and the image signal to the scan driver 20, the emission control driver 30, and the data driver 13.

[0060] In this embodiment, the timing controller 11 includes a first look-up table LUT1 in which a plurality of first initialization voltages corresponding to a plurality of maximum luminances are recorded. The timing controller 11 can determine the value of the first initialization voltage based on the received information related to the target maximum luminance and the first look-up table LUT1. In some embodiments, the first look-up table LUT1 can exist outside the timing controller 11.

[0061] The initialization voltage generator 12 can generate at least one initialization voltage. For example, the first initialization voltage can be supplied to the anode of the organic light emitting diode included in the pixel to initialize the amount of charge accumulated in the organic light emitting diode. Also, for example, the third initialization voltage can be supplied to the gate terminal of the driving transistor included in the pixel to initialize the amount of charge accumulated in the gate electrode of the driving transistor. In this embodiment, the third initialization voltage is not separately defined but can have a fixed value. For example, when the first offset value is 0, the third initialization voltage can have a value equal to the value of the first initialization voltage.

[0062] In this embodiment, the initialization voltage generator 12 can generate the first initialization voltage having a predetermined value and supply the generated first initialization voltage to the anode of the first organic light emitting diode of the first pixel. Later, the first initialization voltage will be described in detail with reference to FIG. 2. Figure 2 Further details of the first pixel, the first organic light emitting diode, and the first initialization voltage will be described in more detail.

[0063] The data driver 13 generates data voltages to be supplied to the plurality of data lines D1, D2, …, and Dm by receiving the control signal and the image signal from the timing controller 11. The data voltages generated in the pixel row unit can be simultaneously supplied to the plurality of data lines D1, D2, …, and Dm according to the output control signal included in the control signal.

[0064] The scan driver 20 generates scan signals to be supplied to the plurality of scan lines S0, S1, S2, …, and Sn by receiving the control signal from the timing controller 11. In an embodiment, the scan driver 20 can supply the scan signals to the plurality of scan lines S0, S1, S2, …, and Sn in sequence. For example, the control signal CONT1 can include a gate start pulse GSP and a plurality of gate clock signals, and the scan driver 20 can be configured in the form of a shift register to generate the scan signals in a manner of sequentially transferring the gate start pulse to the next stage circuit under the control of the gate clock signals.

[0065] The emission control driver 30 can supply an emission control signal for determining an emission period of the plurality of pixels PX11, PX12, …, PX1m, PX21, PX22, …, PX2m, …, PXn1, PXn2, …, and PXnm to the emission control lines E1, E2, …, and En. For example, each pixel can include an emission control transistor, and the flow of current through the organic light emitting diode can be determined according to the on / off of the emission control transistor in order to control the emission of the organic light emitting diode. In some embodiments, the emission control driver 30 can be configured as an emission control driver of a sequential emission type that allows light to be emitted from each pixel row in turn. In another embodiment, the emission control driver 30 can be configured as an emission control driver of a simultaneous emission type that allows light to be emitted from all pixel rows at the same time.

[0066] The DC-DC converter 50 can generate a plurality of power voltages using the power source. For example, the DC-DC converter 50 can generate a first power voltage and a second power voltage to be used in each pixel. In this embodiment, the first power voltage is smaller than the second power voltage. In another embodiment, the DC-DC converter 50 can generate a plurality of power voltages having different values. Figure 1 In a first embodiment of the present application, the initialization voltage generator 12 is illustrated as being spaced apart from the DC-DC converter 50. However, in another embodiment, the initialization voltage generator 12 can be built in the DC-DC converter 50. In yet another embodiment, at least a part of the DC-DC converter 50 can be built in the driving IC 10.

[0067] The pixel unit 40 can include a plurality of pixels PX11, PX12, …, PX1m, PX21, PX22, …, PX2m, …, PXn1, PXn2, …, and PXnm. Each pixel can be coupled to a corresponding data line and a corresponding scan line, and receive a data voltage input corresponding to a scan signal. Each pixel allows an organic light emitting diode to emit light corresponding to the input data voltage, and thus, the pixel unit 40 displays an image screen.

[0068] Figure 2 is a diagram illustrating a first pixel according to some example embodiments of the present application.

[0069] Referring to Figure 2 , the first pixel PXij includes a plurality of transistors M1, M2, M3, M4, M5, M6, and M7, a storage capacitor Cst1, and a first organic light emitting diode OLED1.

[0070] Hereinafter, a circuit configured with a P-type transistor is described as an example. However, a person skilled in the art can design a circuit configured with an N-type transistor by changing the polarity of a voltage applied to a gate terminal of a transistor. Similarly, a person skilled in the art can design a circuit configured with a combination of a P-type transistor and an N-type transistor. A P-type transistor is generally referred to as a transistor in which the amount of current flowing through the transistor increases when a voltage difference between a gate terminal and a source terminal increases in a negative direction. An N-type transistor is generally referred to as a transistor in which the amount of current flowing through the transistor increases when a voltage difference between a gate terminal and a source terminal increases in a positive direction. A transistor can be configured in various forms, such as a thin film transistor (TFT), a field effect transistor (FET), and a bipolar junction transistor (BJT).

[0071] One electrode of the transistor M1 can be coupled to another electrode of the transistor M5, the other electrode of the transistor M1 can be coupled to one electrode of the transistor M6, and a gate electrode of the transistor M1 can be coupled to the other electrode of the storage capacitor Cst1. The transistor M1 can be referred to as a first drive transistor. The transistor M1 determines the amount of drive current flowing between the second power voltage ELVDD and the first power voltage ELVSS in accordance with a potential difference between its gate electrode and source electrode.

[0072] One electrode of the transistor M2 can be coupled to the data line Dj, the other electrode of the transistor M2 can be coupled to the one electrode of the transistor M1, and a gate electrode of the transistor M2 can be coupled to the scan line Si of the current stage. The transistor M2 can be referred to as a first scan transistor. If an on-level scan signal is applied to the scan line Si of the current stage, the transistor M2 allows a data voltage of the data line Dj to be applied to the first pixel PXij.

[0073] One electrode of the transistor M3 can be coupled to the other electrode of the transistor M1, the other electrode of the transistor M3 can be coupled to the gate electrode of the transistor M1, and a gate electrode of the transistor M3 can be coupled to the scan line Si of the current stage. If an on-level scan signal is applied to the scan line Si of the current stage, the transistor M3 can allow the transistor M1 to be diode-coupled.

[0074] One electrode of the transistor M4 may be coupled to the gate electrode of the transistor M1, the other electrode of the transistor M4 may be coupled to the third initialization voltage VINT3, and the gate electrode of the transistor M4 may be coupled to the scan line S(i-1) of the previous stage. In another embodiment, the gate electrode of the transistor M4 may be coupled to another scan line. If a scan signal of an on-level is applied to the scan line S(i-1) of the previous stage, the transistor M4 allows the amount of charge accumulated in the gate electrode of the transistor M1 to be initialized by supplying the third initialization voltage VINT3 to the gate electrode of the transistor M1.

[0075] One electrode of transistor M5 may be coupled to the second power voltage ELVDD, the other electrode of transistor M5 may be coupled to the one electrode of transistor M1, and the gate electrode of transistor M5 may be coupled to emission control line Ei. One electrode of transistor M6 may be coupled to the other electrode of transistor M1, the other electrode of transistor M6 may be coupled to the anode of first organic light emitting diode OLED1, and the gate electrode of transistor M6 may be coupled to emission control line Ei. Transistors M5 and M6 may be referred to as emission control transistors. If an emission control signal of an on level is applied to emission control line Ei, transistors M5 and M6 form a current path between second power voltage ELVDD and first power voltage ELVSS, allowing first organic light emitting diode OLED1 to emit light.

[0076] One electrode of the transistor M7 may be coupled to the anode of the first organic light emitting diode OLED1, the other electrode of the transistor M7 may be coupled to the first initialization voltage VINT1, and the gate electrode of the transistor M7 may be coupled to the scan line Si of the current stage. In another embodiment, the gate electrode of the transistor M7 may be coupled to another scan line. If a scan signal of an on level is applied to the scan line Si of the current stage, the transistor M7 allows the amount of charge accumulated in the first organic light emitting diode OLED1 to be initialized by supplying the first initialization voltage VINT1 to the anode of the first organic light emitting diode OLED1.

[0077] An anode electrode of the first organic light emitting diode OLED1 may be coupled to the other electrode of the transistor M6, and a cathode electrode of the first organic light emitting diode OLED1 may be coupled to the first power voltage ELVSS. Figure 2 In FIG. 1 , the capacitance Co1 may be illustrated in order to describe the amount of charge accumulated in the first organic light emitting diode OLED1 .

[0078] Figure 3 is a graph illustrating a first initialization voltage when a target maximum brightness is equal to a reference maximum brightness in the first embodiment.

[0079] As described above, the first initialization voltage VINT1 is generated from the initialization voltage generator 12. In this embodiment, the first initialization voltage VINT1 can be changed according to the target maximum luminance L_tar. For example, the timing controller 11 can search for a first initialization voltage value corresponding to the target maximum luminance L_tar among a plurality of first initialization voltage values corresponding to a plurality of maximum luminances in the first lookup table LUT1, and deliver the searched first initialization voltage value to the initialization voltage generator 12. The initialization voltage generator 12 can generate the first initialization voltage VINT1 according to the delivered first initialization voltage value.

[0080] In this embodiment, the plurality of first initialization voltage values are obtained by adding a first offset value OFFSET1 to a value of the first power voltage ELVSS. Each of the first offset values OFFSET1 can be approximately inversely proportional to a size of a corresponding maximum luminance.

[0081] The plurality of maximum luminances in the first lookup table LUT1 can include a reference maximum luminance L_ref. The first offset value OFFSET1 at the reference maximum luminance L_ref can be 0. That is, when the target maximum luminance L_tar is equal to the reference maximum luminance L_ref, the value of the first power voltage ELVSS can be substantially equal to the value of the first initialization voltage VINT1.

[0082] In Figure 3 In this embodiment, the driving method of the first pixel PXij will be described by giving an example in which a case in which the target maximum luminance L_tar corresponds to the reference maximum luminance L_ref. Figure 2

[0083] At time t1, the data voltage DATA(i-1)j of the previous stage pixel row is applied to the data line Dj, and a scan signal of an on level (low level) is applied to the scan line S(i-1) of the previous stage.

[0084] Since a scan signal of an off level (high level) is applied to the scan line Si of the current stage, the transistor M2 is in an off state, and the data voltage DATA(i-1)j of the previous stage pixel row is prevented from being applied to the first pixel PXij.

[0085] At this time, since the transistor M4 is in an on state, the third initialization voltage VINT3 is applied to the gate electrode of the transistor M1, so that the amount of the charge accumulated in the gate electrode of the transistor M1 is initialized. Since an emission control signal of an off level is applied to the emission control line Ei, the transistor M5 and the transistor M6 are in an off state, and unnecessary emission of the first organic light emitting diode OLED1 due to the process of applying the third initialization voltage VINT3 is prevented.​

[0086] At time t2, since the transistor M4 is turned off because the scan signal of the off level (high level) is applied to the scan line S(i-1) of the previous stage, the supply of the third initialization voltage VINT3 is stopped.

[0087] At time t3, the data voltage DATAij of the pixel row of the current stage is applied, and the scan signal of the on level is applied to the scan line Si of the current stage. Therefore, the transistors M2, M1 and M3 are turned on so that the data line Dj and the gate electrode of the transistor M1 are electrically coupled to each other. Therefore, the data voltage DATAij is applied to the other electrode of the storage capacitor Cst1, and the storage capacitor Cst1 accumulates a large amount of charges corresponding to the difference between the second power voltage ELVDD and the data voltage DATAij.

[0088] At this time, since the transistor M7 is in the on state, the first initialization voltage VINT1 is applied to the anode of the first organic light emitting diode OLED1, and the first organic light emitting diode OLED1 is pre-charged with a large amount of charges corresponding to the difference between the first initialization voltage VINT1 and the first power voltage ELVSS. In this embodiment, Figure 3 The case of the equation of the target maximum luminance L_tar is equal to the reference maximum luminance L_ref and the first offset value OFFSET1 is 0. Therefore, since the first power voltage ELVSS is substantially equal to the first initialization voltage VINT1, there is no voltage difference between both ends of the first organic light emitting diode OLED1, and the amount of the charges pre-charged in the first organic light emitting diode OLED1 becomes 0.

[0089] At time t4, since the scan signal of the off level is applied to the scan line Si of the current stage, the accumulation of the charges in the storage capacitor Cst1 ends, the accumulated charges are maintained, and the initialization of the first organic light emitting diode OLED1 ends.

[0090] At time t5, since the emission control signal of the on level is applied to the emission control line Ei, the transistor M5 and the transistor M6 are turned on, and the amount of the drive current flowing through the transistor M1 is controlled according to the amount of the charges accumulated in the storage capacitor Cst1 so that the drive current flows through the first organic light emitting diode OLED1. The drive current is charged into the capacitance Co1 of the first organic light emitting diode OLED1, and the first organic light emitting diode OLED1 which is fully charged emits light until the emission control signal of the off level is applied to the emission control line Ei.

[0091] The reference maximum luminance L_ref can be defined as a luminance at a degree at which a sufficient driving current flows thereto without any color drag phenomenon being observed. The reference maximum luminance L_ref can be set individually for each product. Thus, in Figure 3 , even when the amount of the charge pre-charged in the first organic light emitting diode OLED1 is 0, the color drag phenomenon is not observed.

[0092] Figure 4 is a graph illustrating the first initialization voltage in the first embodiment when the target maximum luminance is greater than the reference maximum luminance.

[0093] In Figure 4 , the driving method of the first pixel PXij is not different from that of Figure 3 , and thus, a repeated description will be omitted.

[0094] The first lookup table LUT1 includes a first maximum luminance group of the plurality of maximum luminances that exceeds the reference maximum luminance L_ref, and a first offset value OFFSET1 corresponding to the first maximum luminance group is less than 0. Figure 4 The case of is a case in which the target maximum luminance L_tar corresponds to any one of the first maximum luminance group, that is, a case in which the target maximum luminance L_tar is greater than the reference maximum luminance L_ref.

[0095] Figure 4 Thus, in the case of , the first initialization voltage VINT1 is less than the first power voltage ELVSS.

[0096] Figure 4 The case of Figure 3 is a case in which the display apparatus is set to emit light having a high luminance. At this time, the amount of the driving current supplied to the first organic light emitting diode OLED1 is greater than that in the case of Figure 4 , and thus, the color drag phenomenon is not observed. Thus, in the case of , a reverse voltage is applied to the first organic light emitting diode OLED1 to be initialized, so that deterioration of the first organic light emitting diode OLED1 can be delayed.

[0097] Figure 5 is a graph illustrating the first initialization voltage in the first embodiment when the target maximum luminance is less than the reference maximum luminance.

[0098] In Figure 5 , the driving method of the first pixel PXij is not different from that of Figure 3 , and thus, a repeated description will be omitted.

[0099] The first lookup table LUT1 includes a plurality of second maximum luminance groups of the maximum luminances that are smaller than the reference maximum luminance L_ref, and the first offset value OFFSET1 corresponding to the second maximum luminance groups is larger than 0. Figure 5 The case of the first initialization voltage VINT1 is a case where the target maximum luminance L_tar corresponds to any one of the second maximum luminance groups, i.e., a case where the target maximum luminance L_tar is smaller than the reference maximum luminance L_ref.

[0100] Therefore, in the case of the first initialization voltage VINT1, Figure 5 the first initialization voltage VINT1 is larger than the first power voltage ELVSS.

[0101] Figure 5 The case of the first initialization voltage VINT1 is a case where the display device is set to emit light having a low luminance. At this time, the amount of the drive current supplied to the first organic light emitting diode OLED1 is smaller than Figure 3 the amount of the drive current in the case of the first initialization voltage VINT1. Therefore, since the capacitance Co1 is slowly charged, the color drag phenomenon can be observed.

[0102] Therefore, in the case of the first initialization voltage VINT1, Figure 5 the capacitance Co1 is pre-charged according to the first offset value OFFSET1 that is larger than 0 in the period from t3 to t4, so that although a relatively small amount of charge is supplied to the first organic light emitting diode OLED1 through the drive current at the time t5, the capacitance Co1 is fully charged at the target time, and the first organic light emitting diode OLED1 starts to emit light. Therefore, the color drag phenomenon is prevented.

[0103] Figure 6 is a graph illustrating an example of the first initialization voltage, the first power voltage, and the second power voltage according to the target maximum luminance.

[0104] Referring to Figure 6 Table 1 illustrates an example of the first offset value OFFSET1, the first power voltage ELVSS, and the second power voltage ELVDD according to the target maximum luminance L_tar. In Table 1, the unit of luminance is nit, and the unit of voltage is V.

[0105] In Table 1, Figure 6 the first offset value OFFSET1 according to the target maximum luminance L_tar corresponds to the first offset value OFFSET1 described with reference to Figure 3 to Figure 5 , and thus, a repeated description will be omitted.

[0106] According to some example embodiments of the present application, the first power voltage ELVSS can be approximately inversely proportional to the size of the target maximum luminance L_tar. At this time, the second power voltage ELVDD can have a fixed value regardless of the target maximum luminance L_tar. In Figure 6 , the second power voltage ELVDD is, for example, 4.6V.

[0107] More specifically, the first power voltage ELVSS has a certain voltage value when the target maximum luminance L_tar corresponds to the reference maximum luminance L_ref. In addition, the first power voltage ELVSS can have a voltage value lower than the certain voltage value when the target maximum luminance L_tar corresponds to the first maximum luminance group, that is, in a high luminance condition. In addition, the first power voltage ELVSS can have a voltage value equal to or higher than the certain voltage value when the target maximum luminance L_tar corresponds to the second maximum luminance group, that is, in a low luminance condition. Referring to Figure 6 , the reference maximum luminance L_ref is, for example, 100 nit, and the certain voltage value of the first power voltage ELVSS is, for example, -2.6V.

[0108] According to some example embodiments of the present application, in a high luminance condition, the potential difference Vd2 (see Figure 4 ) between the second power voltage ELVDD and the first power voltage ELVSS increases, so that the amount of driving current can be sufficiently secured. In a low luminance condition, the potential difference Vd3 (see Figure 5 ) between the second power voltage ELVDD and the first power voltage ELVSS decreases, so that reduction of power consumption can be achieved. At this time, the potential difference Vd1 (see Figure 3 ) between the second power voltage ELVDD and the first power voltage ELVSS becomes a reference when the target maximum luminance L_tar is the reference maximum luminance L_ref.

[0109] In addition, as described above, the second power voltage ELVDD can have a fixed value regardless of the target maximum luminance L_tar. However, in another embodiment, the second power voltage ELVDD and the first power voltage ELVSS can be changed so that the difference between the second power voltage ELVDD and the first power voltage ELVSS is maintained, as shown in Figure 6 .

[0110] Figure 7 is a diagram illustrating a display apparatus according to some example embodiments of the present application.

[0111] Referring to Figure 7A display apparatus according to some example embodiments of the present application includes a processor 9, a driving IC 10, a scan driver 20, an emission control driver 30, a pixel unit 40', and a DC-DC converter 50. The driving IC 10 can include a timing controller 11', an initialization voltage generator 12', and a data driver 13.

[0112] In Figure 7 the embodiment, the timing controller 11' and the initialization voltage generator 12' are different from the timing controller 11 and the initialization voltage generator 12 in Figure 1 the embodiment. Figure 7 The other components in the embodiment shown are substantially the same as the other components in the embodiment shown in Figure 1 , and thus, the repeated description will be omitted.

[0113] The pixel unit 40' includes a second pixel including a second organic light emitting diode having an organic material with a band gap different from the band gap of the organic material of the first organic light emitting diode OLED1.

[0114] The timing controller 11' further includes a second look-up table LUT2 in which a plurality of second initialization voltage values corresponding to a plurality of maximum luminances are recorded. The timing controller 11' determines a value of the second initialization voltage based on the received information about the target maximum luminance L_tar and the second look-up table LUT2.

[0115] As described above, the plurality of first initialization voltage values are obtained by adding the first offset value OFFSET1 to the value of the first power voltage ELVSS. In this embodiment, the plurality of second initialization voltage values are obtained by adding a second offset value to the value of the first power voltage ELVSS. At this time, the first offset value OFFSET1 and the second offset value can be different from each other except at the reference maximum luminance L_ref. This will be described in detail later with reference to Figure 12 to Figure 14 .

[0116] The initialization voltage generator 12' further generates a second initialization voltage to be supplied to an anode of the second organic light emitting diode.

[0117] Figure 8 is a diagram illustrating an embodiment of a pixel unit according to some example embodiments of the present application.

[0118] Referring to Figure 8 , a portion of the pixel unit 40' is enlarged and illustrated. The pixel unit 40' includes a first pixel PXij and a second pixel PXi(j+1). In Figure 8In this case, the first pixel PXij designates the pixel B, and the second pixel PXi(j+1) designates the pixel C. However, the second pixel PXi(j+1) can designate the pixel A.

[0119] The first organic light emitting diode OLED1 of the pixel B can include an organic material having a relatively high emission efficiency (i.e., exhibiting a high brightness emission compared to energy consumption). The second organic light emitting diode OLED2 of the pixel A or C can include an organic material having a relatively low emission efficiency (i.e., exhibiting a low brightness emission compared to energy consumption). The organic light emitting diodes of the pixel A and the pixel C include organic materials having different bandgaps from each other. However, the pixel B is an object to be compared herein, and thus, for convenience, a difference between the organic light emitting diode of the pixel A and the organic light emitting diode of the pixel C is ignored.

[0120] Therefore, the first organic light emitting diode OLED1 can have a light emitting surface having an area smaller than that of the second organic light emitting diode OLED2. Therefore, Figure 8 FIG. illustrates a case in which the pixel B has an area smaller than that of the pixel A or the pixel C.

[0121] The green organic light emitting diode can generally have the highest emission brightness compared to energy consumption. Therefore, the first organic light emitting diode OLED1 can be a green organic light emitting diode. At this time, the second organic light emitting diode OLED2 can be a red or blue organic light emitting diode. That is, the pixel B can be a green pixel, the pixel A is a red pixel, and the pixel C can be a blue pixel. In addition, the pixel B can be a green pixel, the pixel A is a blue pixel, and the pixel C can be a red pixel.

[0122] However, embodiments of the present disclosure are not limited thereto, and a new organic material having a high emission efficiency can be developed. At this time, the first organic light emitting diode OLED1 can be, for example, a blue organic light emitting diode. At this time, the second organic light emitting diode can be a green or red organic light emitting diode.

[0123] Similarly, the first organic light emitting diode OLED1 can be, for example, a red organic light emitting diode. At this time, the second organic light emitting diode OLED2 can be a green or blue organic light emitting diode.

[0124] However, the first organic light emitting diode OLED1 is not necessarily determined according to the emission efficiency. Referring to Figure 8 , the sum of the number of the pixel A and the number of the pixel C is substantially equal to the number of the pixel B. Therefore, if the emission efficiency of the organic material is similar to each other, as Figure 8 indicated in the above equation, the area of the light emitting surface can be determined to control the emission area of each color.

[0125] Figure 8 The structure of the pixel unit 40' illustrated can be referred to as a P structure.

[0126] Figure 9 FIG. 1B is a diagram illustrating another example of a pixel unit according to some example embodiments of the present application.

[0127] Figure 9 The pixel unit 40" of FIG. 1B is the same as the pixel unit 40' of FIG. 1A in the electrical coupling relationship and configuration of the pixels, and thus, a repeated description will be omitted. Figure 8

[0128] Unlike the pixel unit 40' of FIG. 1A, in the pixel unit 40" of FIG. 1B, the light emitting surface of each pixel can be provided in a diamond shape or a lozenge shape. Figure 8 Figure 9 Figure 9 The structure of the pixel unit 40" of FIG. 1B can be referred to as a diamond P structure.

[0129] Figure 10 FIG. 2 is a diagram illustrating a color dragging phenomenon occurring when the embodiments of the present disclosure are not applied.

[0130] Referring to FIG. 2, Figure 10 illustrates a difference in emission time between a pixel A, a pixel B, and a pixel C when the embodiments of the present disclosure are not applied.

[0131] For example, in order to express a gray color, light emitted from the organic light emitting diodes of the pixel A, the pixel B, and the pixel C will be combined when the brightness of each of the lights reaches a certain level.

[0132] However, in the structures of the pixel units 40' and 40" illustrated in Figure 8 and Figure 9 The capacitance of the first organic light emitting diode OLED1 of the pixel B per unit area can be large, and the amount of driving current flowing through the first organic light emitting diode OLED1 of the pixel B can be small. Thus, as illustrated in Figure 10 the emission time of the pixel B can be later than the emission times of the pixels A and C.

[0133] For this reason, only the pixel A and the pixel C can emit light at the initial period. If the pixel A is a red pixel and the pixel C is a blue pixel, the color observed by the user can be purple. Thus, when the user scrolls a gray color screen, the user can experience a color dragging phenomenon of first observing a purple color.

[0134] Figure 11 FIG. 3 is a diagram illustrating a first pixel and a second pixel according to some example embodiments of the present application. ​​​

[0135] Referring to Figure 11 , the first pixel PXij includes a plurality of transistors M1, M2, M3, M4, M5, M6, and M7, a storage capacitor Cst1, and a first organic light emitting diode OLED1. Figure 11 The first pixel PXij of Figure 2 is identical to the first pixel PXij of , and thus, a repeated description will be omitted.

[0136] The second pixel PXi(j+1) includes a plurality of transistors M1', M2', M3', M4', M5', M6', and M7', a storage capacitor Cst1', and a second organic light emitting diode OLED2. In the second pixel PXi(j+1), an overlapping description of components corresponding to those of the first pixel PXij will be omitted.

[0137] The second pixel PXi(j+1) is different from the first pixel PXij in that one electrode of the transistor M2' is coupled to the data line D(j+1) and a second initialization voltage VINT2 is applied to the other electrode of the transistor M7'.

[0138] As described above, since the first organic light emitting diode OLED1 of the first pixel PXij has a higher emission efficiency than the emission efficiency of the second organic light emitting diode OLED2, a relatively small amount of driving current flows compared to the second pixel PXi(j+1).

[0139] Therefore, in a low brightness condition in which a very small amount of driving current flows, a time required to charge the capacitance Co1 of the first organic light emitting diode OLED1 is later than a time required to charge the capacitance Co2 of the second organic light emitting diode OLED2, and thus, a color trailing phenomenon can occur as Figure 10 indicated.

[0140] A driving method for preventing the color trailing phenomenon will be described in Figure 12 to Figure 14 .

[0141] Figure 12 is a graph illustrating a first initialization voltage and a second initialization voltage when a target maximum brightness is equal to a reference maximum brightness.

[0142] In Figure 12 , the driving method of the first pixel PXij and the second pixel PXi(j+1) is substantially identical to the driving method of Figure 3 , and thus, a repeated description will be omitted.

[0143] In the case of the reference maximum luminance L_ref, the first offset value OFFSET1 and the second offset value OFFSET2 can be 0. That is, the first initialization voltage VINT1, the second initialization voltage VINT2, and the first power voltage ELVSS can be substantially equal to each other when the target maximum luminance L_tar is equal to the reference maximum luminance L_ref.

[0144] At this time, in the period from t3 to t4, the potential difference between both ends of each of the first organic light emitting diode OLED1 and the second organic light emitting diode OLED2 is 0 V, and thus the amount of the charge pre-charged in each of the first organic light emitting diode OLED1 and the second organic light emitting diode OLED2 becomes 0.

[0145] As described above, the reference maximum luminance L_ref can be defined as a luminance at a degree at which a sufficient driving current flows thereto without any color drag phenomenon being observed. Thus, in the case of the reference maximum luminance L_ref, the first offset value OFFSET1 and the second offset value OFFSET2 can be 0. Figure 12 In the case of the reference maximum luminance L_ref, the first offset value OFFSET1 and the second offset value OFFSET2 can be 0. That is, the first initialization voltage VINT1, the second initialization voltage VINT2, and the first power voltage ELVSS can be substantially equal to each other when the target maximum luminance L_tar is equal to the reference maximum luminance L_ref.

[0146] The first power voltage ELVSS can have a certain voltage value when the target maximum luminance L_tar corresponds to the reference maximum luminance L_ref. In addition, the second power voltage ELVDD can have a fixed value regardless of the target maximum luminance L_tar. At this time, the potential difference Vd4 between the second power voltage ELVDD and the first power voltage ELVSS becomes a reference of Figure 13 and Figure 14 .

[0147] Figure 13 is a graph illustrating the first initialization voltage and the second initialization voltage when the target maximum luminance is greater than the reference maximum luminance in the second embodiment.

[0148] As described above, the first lookup table LUT1 includes a first maximum luminance group exceeding the reference maximum luminance L_ref among the plurality of maximum luminances, and the first offset value OFFSET1 corresponding to the first maximum luminance group is less than 0. Figure 13 The case of the target maximum luminance L_tar corresponding to any one of the first maximum luminance group is a case in which the target maximum luminance L_tar is greater than the reference maximum luminance L_ref.

[0149] In this embodiment, the second lookup table LUT2 includes a second offset value OFFSET2 corresponding to the first maximum luminance group. The second offset value OFFSET2 corresponding to the first maximum luminance group is less than the corresponding first offset value OFFSET1.

[0150] Therefore, in Figure 13 In the case of , the first initialization voltage VINT1 is lower than the first power voltage ELVSS, and the second initialization voltage VINT2 is lower than the first initialization voltage VINT1 and the first power voltage ELVSS.

[0151] Figure 13 The case where the display device is set to emit light with high brightness. At this time, the amount of driving current supplied to the first organic light emitting diode OLED1 and the second organic light emitting diode OLED2 is greater than Figure 12 The amount of driving current in the case of , and therefore the color dragging phenomenon is not observed. Figure 13 In the case of , a reverse voltage is applied to the first and second organic light emitting diodes OLED1 and OLED2 to be initialized, so that degradation of the first and second organic light emitting diodes OLED1 and OLED2 may be delayed.

[0152] In addition, the first initialization voltage VINT1 is set to be greater than the second initialization voltage VINT2, so that the capacitor Co1 of the first organic light emitting diode OLED1 can be pre-charged with a voltage higher than the voltage of the capacitor Co2 of the second organic light emitting diode OLED2. Therefore, at time t5, the emission start time of the first organic light emitting diode OLED1 can be further ahead than the emission start time of the second organic light emitting diode OLED2. Therefore, referring to Figure 10 , the interval between the emission start time of pixels A and C and the emission start time of pixel B can be reduced.

[0153] The first power voltage ELVSS may have a voltage value lower than a specific voltage value when the target maximum brightness L_tar corresponds to the first maximum brightness group. That is, the potential difference Vd5 may be greater than Figure 12 Vd4, and thus the driving current necessary for high-brightness driving can be ensured.

[0154] Figure 14 is a graph illustrating a first initialization voltage and a second initialization voltage when a target maximum brightness is less than a reference maximum brightness in the second embodiment.

[0155] As described above, the first lookup table LUT1 includes a second maximum brightness group smaller than the reference maximum brightness L_ref among the plurality of maximum brightnesses, and the first offset value OFFSET1 corresponding to the second maximum brightness group is greater than 0. Figure 14 The case is a case where the target maximum brightness L_tar corresponds to any one of the second maximum brightness group, that is, a case where the target maximum brightness L_tar is smaller than the reference maximum brightness L_ref.

[0156] In this embodiment, the second lookup table LUT2 includes second offset values OFFSET2 corresponding to the second maximum luminance group. The second offset values OFFSET2 corresponding to the second maximum luminance group are smaller than the corresponding first offset values OFFSET1.

[0157] Therefore, in the case of Figure 14 , the first initialization voltage VINT1 is greater than the first power voltage ELVSS, and the second initialization voltage VINT2 is smaller than the first initialization voltage VINT1. In addition, the second initialization voltage VINT2 can be greater than the first power voltage ELVSS.

[0158] Figure 14 The case of Figure 12 is a case in which the display device is set to emit light having a low luminance. At this time, the amount of drive current supplied to the first organic light emitting diode OLED1 is smaller than the amount of drive current in the case of . Therefore, since the capacitance Co1 is slowly charged, a color lag phenomenon can be observed.

[0159] Figure 14 Therefore, in the case of , the capacitance Co1 is pre-charged according to the first offset value OFFSET1 greater than 0 in the period from t3 to t4, so that although a relatively small amount of charge is supplied to the first organic light emitting diode OLED1 through the drive current at time t5, the capacitance Co1 is fully charged at the target time, and the first organic light emitting diode OLED1 starts to emit light. Therefore, a color lag phenomenon is prevented.

[0160] In addition, the first initialization voltage VINT1 is set to be greater than the second initialization voltage VINT2, so that the capacitance Co1 of the first organic light emitting diode OLED1 can be pre-charged with a voltage higher than the voltage of the capacitance Co2 of the second organic light emitting diode OLED2. Therefore, at time t5, the emission start time of the first organic light emitting diode OLED1 can be further ahead than the emission start time of the second organic light emitting diode OLED2. Therefore, with reference to Figure 10 , it is possible to reduce the interval between the emission start times of the pixel A and the pixel C and the emission start time of the pixel B.

[0161] The first power voltage ELVSS can have a voltage value equal to or higher than a certain voltage value when the target maximum luminance L_tar corresponds to the second maximum luminance group. That is, the potential difference Vd6 is equal to or smaller than Figure 12 Vd4 of , so that reduction in power consumption can be facilitated.

[0162] The above-described first lookup table LUT1 and second lookup table LUT2 can be configured with a storage device such as a memory.

[0163] According to some example embodiments according to the present disclosure, in a display device and a driving method thereof, an initialization voltage is controlled according to a brightness condition so that a color trailing phenomenon can be eliminated or mitigated.

[0164] Electronic or electric devices according to embodiments of the application described herein and / or any other related devices or components can be implemented with any suitable hardware, firmware (e.g., an application specific integrated circuit), software, or combinations of software, firmware, and hardware. For example, various components of the devices can be formed on one integrated circuit (IC) chip or on separate IC chips. Also, various components of the devices can be implemented on a flexible printed circuit film, a tape carrier package (TCP), a printed circuit board (PCB), or formed on a substrate. Further, various components of the devices can be processes or threads, running on one or more processors in one or more computing devices, executing computer program instructions and interacting with other system components for performing the various functionalities described herein. The computer program instructions are stored in a memory which can be implemented using any suitable memory (e.g., random access memory (RAM), read only memory (ROM), etc.). The computer program instructions can also be stored in any other non-transitory computer-readable medium such as a CD-ROM, a flash drive, etc. Also, a person of ordinary skill in the art should recognize that the functionality of various computing devices can be combined or integrated into a single computing device, or the functionality of a particular computing device can be distributed across one or more other computing devices, without departing from the spirit and scope of the example embodiments of the present application.

[0165] Aspects of some example embodiments have been disclosed herein, and although the use of certain terms can imply a certain terminology, these are used and construed only in a generic and descriptive sense, and not for limitation purposes. In some instances, features, attributes and / or elements described in conjunction with a particular example embodiment are also applicable in combination with features, attributes and / or elements described in conjunction with other example embodiments, unless expressly stated otherwise. Accordingly, a person of ordinary skill in the art will understand that various changes in form and details can be made without departing from the spirit and scope of the disclosure as set forth in the following claims and equivalents thereof.

Claims

1. A display device, comprising: a first pixel comprising a first electrode initialization transistor and a first light emitting diode for emitting light having a first color, the first light emitting diode comprising a first electrode and a second electrode; as well as a second pixel including a second electrode initialization transistor and a second light emitting diode for emitting light having a second color different from the first color, the second light emitting diode including a third electrode and a fourth electrode, wherein the second electrode of the first light emitting diode and the fourth electrode of the second light emitting diode are configured to receive a first power voltage, The first electrode of the first light emitting diode is configured to receive a first initialization voltage through the first electrode initialization transistor, and The third electrode of the second light emitting diode is configured to receive a second initialization voltage through the second electrode initialization transistor, and the second initialization voltage is different from the first initialization voltage and the first power voltage.

2. The display device according to claim 1, in, An area of ​​a light emitting surface of the first light emitting diode is smaller than an area of ​​a light emitting surface of the second light emitting diode.

3. The display device according to claim 1, in, The first pixel further includes a first driving transistor and a first initialization transistor, the first driving transistor being configured to receive a first voltage through the first initialization transistor. The second pixel further includes a second driving transistor and a second initialization transistor, the second driving transistor is configured to receive a second voltage through the second initialization transistor, and The second voltage has the same value as the first voltage.

4. The display device according to claim 3, in, The first initialization voltage is different from the first voltage.

5. The display device according to claim 4, in, The second initialization voltage is different from the second voltage.

6. The display device according to claim 5, in, The first initialization voltage is greater than the second initialization voltage.

7. The display device according to claim 6, further comprising: a first data line; as well as a second data line, different from the first data line, wherein the first pixel is coupled to the first data line, and The second pixel is coupled to the second data line.

8. The display device according to claim 7, further comprising: First scan line; as well as a second scan line, different from the first scan line, The first initialization transistor and the second initialization transistor are coupled to the first scan line, and The first electrode initialization transistor and the second electrode initialization transistor are coupled to the second scan line.

9. The display device according to claim 3, in, a first initialization line connected to the first electrode through the first electrode initialization transistor for receiving the first initialization voltage, and The second initialization line connected to the third electrode through the second electrode initialization transistor is used to receive the second initialization voltage.

10. The display device according to claim 9, in, The first initialization line and the second initialization line are separated from each other.

11. A display device comprising: a first pixel comprising a first driving transistor, a first initialization transistor, a first electrode initialization transistor, and a first light emitting diode for emitting light having a first color, wherein the first light emitting diode comprises a first electrode; as well as a second pixel including a second driving transistor, a second initialization transistor, a second electrode initialization transistor, and a second light emitting diode for emitting light having a second color different from the first color, the second light emitting diode including a second electrode, wherein the first driving transistor is configured to receive a first voltage through the first initialization transistor, and the second driving transistor is configured to receive a second voltage through the second initialization transistor, the second voltage having the same value as the first voltage, and The first electrode is used to receive a third voltage through the first electrode initialization transistor, and the second electrode is used to receive a fourth voltage through the second electrode initialization transistor, and the third voltage is different from the fourth voltage.

12. The display device according to claim 11, in, The first light emitting diode includes a third electrode, Wherein, the second light emitting diode includes a fourth electrode, wherein the third electrode of the first light emitting diode is used to receive a first power voltage, and The fourth electrode of the second light-emitting diode is used to receive the first power voltage.

13. The display device according to claim 12, wherein The first power voltage is different from the fourth voltage.

14. The display device according to claim 13, wherein The first voltage is different from the third voltage, and The second voltage is different from the fourth voltage.

15. The display device according to claim 14, further comprising: a first data line; a first switch transistor coupled to the first driving transistor and the first data line; a scan line of a current stage, a gate electrode of the first switch transistor being coupled to the scan line of the current stage; a second data line, different from the first data line; as well as The second switch transistor is coupled to the second driving transistor and the second data line, and a gate electrode of the second switch transistor is coupled to the scan line of the current stage.

16. The display device according to claim 15, in, One electrode of the first initialization transistor is coupled to the gate electrode of the first driving transistor, and the other electrode of the first initialization transistor is used to receive the first voltage, and One electrode of the second initialization transistor is coupled to the gate electrode of the second driving transistor, and the other electrode of the second initialization transistor is used to receive the second voltage.

17. The display device according to claim 16, in, One electrode of the first electrode initialization transistor is coupled to the first electrode of the first light emitting diode, The other electrode of the first electrode initialization transistor is used to receive the third voltage. wherein one electrode of the second electrode initialization transistor is coupled to the second electrode of the second light emitting diode, and The other electrode of the second electrode initialization transistor is used to receive the fourth voltage.

Images