Indication device

Abstract

The present invention relates to a display device. [Solution] In a display device according to an embodiment of the present invention, a first voltage is applied to a first driving transistor (M1) of a first pixel circuit (PXij) through a first initialization transistor (M4) of the first pixel circuit, and a second voltage is applied to a second driving transistor (M1') of a second pixel circuit (PXi(j+1)) through a second initialization transistor (M4') of a second pixel circuit, the first voltage and the second voltage have the same value, the first initialization voltage is applied to a first electrode (anode of OLED1) of the first pixel circuit through a first electrode initialization transistor (M7) of the first pixel circuit, and the second initialization voltage is applied to a second electrode (anode of OLED2) of the second pixel circuit through a second electrode initialization transistor (M7') of the second pixel circuit, and the second initialization voltage (voltage of VINT1) is different from the first initialization voltage (voltage of VINT2).

Description

[Technical Field]

[0001] The present invention relates to a display device and a driving method thereof. [Background technology]

[0002] As information technology develops, the display device, which is the connection medium between users and information devices, In response to this, the importance of liquid crystal displays (LCDs) has been increasing. al Display Device), organic electroluminescent display device (Organic Li Light Emitting Display Device, Plasma Display Panel The use of display devices such as plasma display panels is increasing. do.

[0003] Among display devices, organic electroluminescent displays are devices that generate light by the recombination of electrons and holes. It displays images using LEDs, which have a fast response time. Both have the advantage of being driven with low power consumption.

[0004] The organic electroluminescence display device applies a data voltage to each pixel to express a desired gray level. By inputting a data voltage and making multiple organic light-emitting diodes emit light according to the data voltage, the desired The image is displayed to the user.

[0005] Typically, the plurality of organic light-emitting diodes are composed of red, blue, and green organic light-emitting diodes. The organic materials in each organic light-emitting diode have different band gaps. ap), they emit light at different wavelengths.

[0006] Generally, green organic light-emitting diodes have a high efficiency of luminous brightness relative to energy consumption. and is configured to have a light-emitting surface that is smaller in area than organic light-emitting diodes of other colors. In addition, the driving current flowing through the green organic light-emitting diode may be the same as that flowing through the other color organic light-emitting diodes. The magnitude of the drive current may be set to be smaller than the drive current flowing through the gate.

[0007] However, under low brightness conditions where the driving current is very small, the capacity of the green organic light-emitting diode They take a long time to charge and emit light slower than other colored OLEDs. There is a problem with color blur, which occurs when the image becomes blurry. be. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Application Registration No. 10-0840116 [Patent Document 2] Korean Patent Application Publication No. 10-2015-0064543 [Patent Document 3] Korean Patent Application Publication No. 10-2014-0134046 Summary of the Invention [Problem to be solved by the invention]

[0009] The technical problem to be solved is to develop a pixel circuit with a structure that can eliminate the color bleeding phenomenon. The present invention provides a display device including the above-mentioned pixel circuit and a driving method thereof. [Means for solving the problem]

[0010] A display device according to an embodiment of the present invention includes: a first initialization voltage source for providing a first initialization voltage; a second initialization voltage source that provides a second initialization voltage that is smaller than the first initialization voltage; A first pixel circuit including a light emitting diode and the first organic light emitting diode have a band gap a second pixel circuit including a second organic light-emitting diode including an organic material having a different band gap; and the first pixel circuit is connected to the first initialization voltage source and the second initialization voltage source. The second pixel circuit is connected to a single (only one per pixel circuit) initial The capacitor is connected to a voltage source.

[0011] The second organic light emitting diode has a larger capacitance per unit area than the first organic light emitting diode. The capacitance may be large.

[0012] The second organic light emitting diode has a smaller light emitting surface area than the first organic light emitting diode. It's okay.

[0013] The single initialization voltage source may be a first initialization voltage source.

[0014] The first pixel circuit has one end connected to the anode of the first organic light-emitting diode during a light-emitting period. the second pixel circuit further includes a first driving transistor electrically connected to the first driving transistor; a second driving diode, one end of which is electrically connected to the anode of the second organic light-emitting diode; The first initialization voltage source further includes a transistor, and the first initialization voltage source supplies a first driving voltage to the first driver during a first initialization period. a gate terminal of the first drive transistor and a gate terminal of the second drive transistor; This may be done.

[0015] The second initialization voltage source supplies a voltage to the anode of the first organic light emitting diode during a second initialization period. the first initialization voltage source is electrically connected to the second active The light emitting diode may be electrically connected to the anode of the light emitting diode.

[0016] The single initialization voltage source may be a second initialization voltage source.

[0017] The second initialization voltage source supplies a voltage to the anode of the first organic light emitting diode during a second initialization period. The light emitting diode may be electrically connected to the anode of the second organic light emitting diode and the cathode of the second organic light emitting diode.

[0018] The first pixel circuit has one end connected to the anode of the first organic light-emitting diode during a light-emitting period. the second pixel circuit further includes a first driving transistor electrically connected to the first driving transistor; a second driving diode, one end of which is electrically connected to the anode of the second organic light-emitting diode; The first initialization voltage source further includes a transistor, and the first initialization voltage source supplies a first driving voltage to the first driver during a first initialization period. the second initialization voltage source is electrically connected to the gate terminal of the first initialization transistor; During the initialization period, the gate terminal of the second driving transistor may be electrically connected to the gate terminal of the second driving transistor. .

[0019] The first initialization period may precede the second initialization period.

[0020] a third initialization voltage having a voltage value different from the first initialization voltage and the second initialization voltage; the single initialization voltage source further comprising a third initialization voltage source for providing the third initialization voltage; It may also be a pressure source.

[0021] The third initialization voltage is a value between the first initialization voltage and the second initialization voltage. Good too.

[0022] The second initialization voltage source supplies a voltage to the anode of the first organic light emitting diode during a second initialization period. the third initialization voltage source is electrically connected to the second active The light emitting diode may be electrically connected to the anode of the light emitting diode.

[0023] The first pixel circuit has one end connected to the anode of the first organic light-emitting diode during a light-emitting period. the second pixel circuit further includes a first driving transistor electrically connected thereto, a second driving transistor, one end of which is electrically connected to the anode of the second organic light-emitting diode; a first initialization voltage source for supplying a first driving transistor to the first driving transistor during a first initialization period; The third initialization voltage source is electrically connected to the gate terminal of the transistor, and the first initialization voltage source is During this period, the second driving transistor may be electrically connected to the gate terminal of the second driving transistor.

[0024] The first organic EL element is connected to the first initialization voltage source and the second initialization voltage source. The light emitting diode and the second organic light emitting diode include an organic material having a different band gap. a third pixel circuit including a third organic light emitting diode; a first data line; and and a different second data line, and the first pixel circuit and the third pixel circuit are The first pixel circuit may be connected to the first data line, and the second pixel circuit may be connected to the second data line.

[0025] The first organic light-emitting diode is a red organic light-emitting diode, and the second organic light-emitting diode is a red organic light-emitting diode. The first organic light-emitting diode is a green organic light-emitting diode, and the third organic light-emitting diode is a blue organic light-emitting diode. It may also be ode.

[0026] The first organic light-emitting diode is a red organic light-emitting diode, and the second organic light-emitting diode is a red organic light-emitting diode. The first organic light-emitting diode is a blue organic light-emitting diode, and the third organic light-emitting diode is a green organic light-emitting diode. It may also be ode.

[0027] The first organic light-emitting diode is a blue organic light-emitting diode, and the second organic light-emitting diode is a The first organic light-emitting diode is a red organic light-emitting diode, and the third organic light-emitting diode is a green organic light-emitting diode. It may also be ode.

[0028] The third pixel circuit has one end connected to the anode of the third organic light-emitting diode during a light-emitting period. a third driving transistor electrically connected to the first initialization voltage source; During the initialization period, the second initialization voltage is connected to the gate terminal of the third driving transistor. A voltage source is electrically connected to the anode of the third organic light-emitting diode during a second initialization period. Good too.

[0029] In a method for driving a display device according to an embodiment of the present invention, a first initialization voltage is applied to a first initialization period. to the gate terminal of the first driving transistor of the first pixel circuit, and a single initialization voltage is applied to the gate terminal of the second pixel circuit. a step of applying a voltage to a gate terminal of a second driving transistor of the element circuit; and a second initialization voltage smaller than the first initialization voltage is applied to the first organic light-emitting diode of the first pixel circuit; and applying the single initialization voltage to the anode of the first organic light-emitting diode of the second pixel circuit. The anode of a second organic light-emitting diode contains an organic material with a different band gap than the anode. and applying a voltage to the first organic light emitting diode and the second organic light emitting diode during a light emitting period. and causing the electrode to emit light.

[0030] The single initialization voltage may be equal to the first initialization voltage.

[0031] The single initialization voltage may be equal to the second initialization voltage.

[0032] The single initialization voltage has a value different from the first initialization voltage and the second initialization voltage. That's fine.

[0033] The single initialization voltage has a value between the first initialization voltage and the second initialization voltage. Good too. [Effects of the Invention]

[0034] The display device and the driving method thereof according to the present invention have a structure capable of eliminating the color bleeding phenomenon. Includes pixel circuits. [Brief explanation of the drawings]

[0035] [Figure 1] 1 is a diagram illustrating a display device according to an embodiment of the present invention; [Figure 2] 1 is a diagram illustrating a pixel unit according to an embodiment of the present invention; [Figure 3] 10A and 10B are diagrams illustrating a pixel unit according to another embodiment of the present invention; [Figure 4] 10A and 10B are diagrams illustrating differences in light emission timing for each pixel; [Figure 5] FIG. 2 is a diagram illustrating a pixel circuit according to an embodiment of the present invention. [Figure 6] FIG. 6 is a diagram for explaining a method of driving the pixel circuit of FIG. [Figure 7] 6 is a diagram for explaining a case where the connection configuration of the initialization voltage source is changed in the pixel circuit of FIG. 5. FIG. [Figure 8] 8 is a diagram for explaining the effect of increasing current by the configuration of FIG. 7. FIG. [Figure 9] 10A and 10B are diagrams illustrating a display device according to another embodiment of the present invention. [Figure 10] 10 is a diagram illustrating a pixel circuit connected to an initialization voltage source according to another embodiment of the present invention. FIG. [Figure 11] FIG. 6 is a diagram for explaining a case where the embodiment of FIG. 5 is applied to another pixel circuit. [Figure 12]FIG. 8 is a diagram for explaining a case where the embodiment of FIG. 7 is applied to another pixel circuit. [Figure 13] 11 is a diagram for explaining a case where the embodiment of FIG. 10 is applied to another pixel circuit. DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will be described in detail so that those skilled in the art can easily carry out the invention. The present invention may be implemented in various forms and is not limited to the embodiments described herein.

[0037] In order to clearly explain the present invention, parts that are not relevant to the explanation will be omitted, and the entire specification will be The same reference numerals are used to refer to the same or similar components. can also be used on other drawings.

[0038] Furthermore, the size and thickness of each component shown in the drawings are arbitrarily shown for the convenience of explanation. The present invention is not necessarily limited to the illustrated embodiments. In some embodiments, the thickness of layers and regions may be exaggerated for clarity.

[0039] FIG. 1 is a diagram illustrating a display device according to an embodiment of the present invention.

[0040] Referring to FIG. 1, a display device 9 according to an embodiment of the present invention includes a timing control unit 40, a driving The display device includes a scan driver 10, a data driver 20, a light emission control driver 30, and a pixel unit 50.

[0041] The timing control unit 40 receives control signals and video signals R, G, and B from an external device. The signal is converted to the specifications of the device 9 and controlled by the scan driver 10. The control signal CONT1 is sent to the light emission control driver 30, the control signal CONT3 is sent to the data driver 20, The timing control unit 40 supplies the control signal CONT2 and the video signals R', G', and B'. The received control signals may include a horizontal synchronization signal Hsync and a vertical synchronization signal Vsync. stomach.

[0042] The scan driver 10 receives a control signal CONT1 and drives a plurality of scan lines S1, S2, . . . , According to one embodiment, the scan driver 10 generates scan signals to be supplied to the plurality of scan lines Sn. Scanning signals can be supplied in sequence via lines S1, S2, ..., Sn. The control signal CONT1 is a gate start pulse (GS P) and a plurality of gate clock signals. The scan driver 10 may include a shift register (shift register) and clocks the gate start pulse. The scanning signal may be generated in such a way that it is transmitted to the next stage circuit in sequence according to the control of the scan signal. .

[0043] The data driver 20 receives the control signal CONT2 and the image signals R', G', and B'. The data voltages to be supplied to the data lines D1, D2, ..., Dm are generated. The data voltage generated by the CONT1 is simultaneously controlled by the output control signal CONT2. may be applied to multiple data lines D1, D2, . . . , Dm.

[0044] The pixel section 50 includes a plurality of pixel circuits PX11, PX12, . . . , PX1m, PX21, P Including X22, ..., PX2m, ..., PXn1, PXn2, ..., PXnm Each pixel may be connected to a corresponding data line and a scan line, and the data may be output in response to a scan signal. Each pixel circuit may receive an input of a data voltage. Makes the anode glow.

[0045] The light emission control driver 30 includes a plurality of pixel circuits PX11, PX12, ..., PX1m, PX 21, PX22, ..., PX2m, ..., PXn1, PXn2, ..., PXnm A light emission control signal that determines the light emission period is supplied via light emission control lines E1, E2, ..., En. For example, each pixel may include a light-emitting control transistor, and the light-emitting control transistor may be turned on or off. The light emission control is performed by determining whether or not a current flows to the organic light emitting diode depending on the This may be done.

[0046] The display device 9 includes a plurality of voltage sources ELVDD, ELVSS, VINT1, and VINT2. In the embodiment of FIG. 1, multiple voltage sources ELVDD, ELVSS, VINT1, VI Although the NT2 is shown positioned below the pixel section 50, in other embodiments, it may be positioned The voltage sources ELVDD, ELVSS, VINT1, and VINT2 are located in the upper part of the pixel section 50, i.e., It may be located adjacent to the data driver 20 .

[0047] The voltage source ELVDD is electrically connected to the anode of each organic light-emitting diode, and the voltage source EL VSS is electrically connected to the cathode of each organic light-emitting diode and supplies the drive current required for light emission. The voltage of the voltage source ELVDD is greater than the voltage of the voltage source ELVSS. It's okay.

[0048] The first initialization voltage source VINT1 provides a first initialization voltage. T2 provides a second initialization voltage that is smaller than the first initialization voltage. The first pixel circuit and the second pixel circuit are connected to such initialization voltage sources VINT1 and VINT2. A detailed embodiment of this will be described later with reference to FIG. .

[0049] FIG. 2 is a diagram illustrating a pixel unit according to an embodiment of the present invention.

[0050] Referring to FIG. 2, a pixel unit 50 according to an embodiment of the present invention includes a first pixel circuit A, a second pixel circuit B, a The pixel circuit B may include a first pixel circuit B, and a second pixel circuit C.

[0051] The first pixel circuit A includes a first driving transistor and a first organic light-emitting diode. The second pixel circuit B may include a second driving transistor and a second organic light-emitting diode. The third pixel circuit C may include a third driving transistor and a third organic It may be a pixel circuit including a light emitting diode.

[0052] In an embodiment of the present invention, the second organic light emitting diode has a high light emitting brightness relative to the energy consumption. Therefore, the second organic light-emitting diode is assumed to contain an organic material with high luminous efficiency. , even if the area of ​​the light-emitting surface is smaller than that of the first organic light-emitting diode or the third organic light-emitting diode. Therefore, in FIG. 2, the area of ​​the second pixel circuit B is larger than that of the first pixel circuit A and the third pixel circuit C. It is shown smaller.

[0053] Green organic light-emitting diodes usually have the highest luminance relative to energy consumption. Thus, for example, the second organic light-emitting diode may be a green organic light-emitting diode. In this case, the first organic light emitting diode and the third organic light emitting diode may be The first organic light emitting diode and the second organic light emitting diode may be red and blue organic light emitting diodes. The first and second organic light-emitting diodes may be blue and red organic light-emitting diodes, respectively. stomach.

[0054] However, the present invention is not limited to this example. It is possible that a second organic light-emitting diode may be developed, in which case, for example, the second organic light-emitting diode may be blue. In this case, the first organic light emitting diode and the third organic light emitting diode may be The diodes may be red and green organic light emitting diodes, respectively. The organic light-emitting diode and the third organic light-emitting diode are green and red organic light-emitting diodes, respectively. It may also be a diode.

[0055] Similarly, for example, the second organic light emitting diode may be a red organic light emitting diode. At this time, the first organic light emitting diode and the third organic light emitting diode emit blue and The first organic light emitting diode and the third organic light emitting diode may be a green organic light emitting diode. The organic light emitting diodes may be green and blue organic light emitting diodes, respectively.

[0056] However, the second organic light-emitting diode is not necessarily determined based on the luminous efficiency. 2, the sum of the number of first pixel circuits A and the number of third pixel circuits C is Therefore, if the luminous efficiency of each organic material is similar, In order to match the light-emitting area of ​​each color, even if the area of ​​the light-emitting surface is determined as shown in Figure 2, good.

[0057] According to an embodiment of the present invention, the display device 9 includes a plurality of data lines, 1 data line Dj, D(j+2), ... and 2 data lines D(j+1), D(j+3), .... The first data lines Dj, D(j+2), ... and the second data lines Dj, D(j+3), ... may be configured to include: The data lines D(j+1), D(j+3), . . . are different data lines and alternately For example, the first data lines Dj, D(j+2), ... may be odd-numbered data lines. The second data lines D(j+1), D(j+3), ... are even-numbered data lines. It is also possible.

[0058] The first pixel circuit A and the third pixel circuit C are connected to the first data lines Dj, D(j+2), . . . It may be continued.

[0059] The second pixel circuit B may be connected to the second data lines D(j+1), D(j+3), . . . good.

[0060] In the pixel section 50 of FIG. 2, the scanning line of the previous stage is The figure shows the signal being input to each pixel circuit of the current stage. The scanning line S(i-1) of the current stage is connected to each pixel circuit A, B, C connected to the scanning line S(i) of the current stage. is connected.

[0061] In the embodiment of the present invention, the signal applied to the scan line of the previous stage is the first signal for the pixel circuit of the current stage. 1 may be used as an initialization signal. For specific connection relationships, see Figure 4 and subsequent figures. This will be discussed in more detail below.

[0062] However, the signal used as the first initialization signal is the signal applied to the previous scanning line. Alternatively, a dedicated initialization line may be provided separately, independent of the scanning line. The present embodiment is not limited to the case where the scanning line of the previous stage is always input to each pixel circuit of the current stage. It cannot be done.

[0063] The structure of the pixel section 50 as shown in FIG. 2 may be called a pentile structure. .

[0064] FIG. 3 is a diagram illustrating a pixel unit according to another embodiment of the present invention.

[0065] The pixel section 50' in FIG. 3 is similar to the pixel section 50 in FIG. 2 in terms of electrical connection relationship and pixel circuit configuration. Since they are the same, a duplicated description will be omitted.

[0066] The pixel section 50' of FIG. 3 differs from the pixel section 50 of FIG. 2 in that the light-emitting surface of each pixel is a diamond. The structure of the pixel portion 50' in FIG. 3 may be a diamond pentatile ( This may also be called the diamond pentile structure.

[0067] FIG. 4 is a diagram illustrating the difference in light emission timing for each pixel.

[0068] FIG. 4 shows the difference in light emission timing for each pixel when the embodiment of the present invention is not applied. There are.

[0069] For example, to express gray, the first organic light-emitting diode of the first pixel circuit A the second organic light-emitting diode of the second pixel circuit B, and the organic light-emitting diode of the third pixel circuit C. The brightness of each of the modes must be combined at a certain level.

[0070] However, in the structure of the pixel section 50, 50' as shown in FIGS. 2 and 3, the second active element of the second pixel circuit B The capacitance per unit area of ​​the LED is large, and the driving current is small. Therefore, as shown in FIG. 4, the light emitting point of the second organic light emitting diode is the most It may be delayed.

[0071] Therefore, initially, the first organic light emitting diode of the first pixel circuit A and the second organic light emitting diode of the third pixel circuit C Only the third organic light emitting diode can emit light. If the first organic light emitting diode emits red light, If the third organic light-emitting diode is a blue organic light-emitting diode, The color the user sees will be purple. This allows for a gray screen to be scrolled. However, there is a problem in that a color bleeding phenomenon occurs in which the user sees purple first.

[0072] FIG. 5 is a diagram illustrating a pixel circuit according to an embodiment of the present invention.

[0073] In the following, a circuit consisting of P-type transistors will be described as an example. By changing the polarity of the voltage applied to the gate terminal, a circuit consisting of N-type transistors can be created. Similarly, those skilled in the art will be able to distinguish between P-type and N-type transistors. You can design a circuit using a combination of P-type transistors. When the voltage difference between the gate and source terminals increases in the negative direction, the amount of current conducted increases. N-type transistors are transistors that have a voltage difference between the gate and source terminals. It is a general term for transistors that conduct more current when the voltage increases in the positive direction. The transistors are TFT (thin film transistor), FET (field d effect transistor), BJT(bipolar junctio The transistor may be of various forms, such as a n-type transistor.

[0074] Referring to FIG. 5, a first pixel circuit PXij according to an embodiment of the present invention includes a plurality of transistors. M1, M2, M3, M4, M5, M6, M7, a storage capacitor Cst1, The first pixel circuit PXij may include a first organic light emitting diode OLED1. and 3 correspond to the first pixel circuit A.

[0075] The first pixel circuit PXij is connected to a first initialization voltage source VINT1 and a second initialization voltage source VINT 2. As described above, the first initialization voltage of the first initialization voltage source VINT1 is greater than the second initialization voltage of the second initialization voltage source VINT2. For example, the first initialization voltage is −2V, the second initialization voltage may be −5V.

[0076] Referring to FIG. 5, the second pixel circuit PXi(j+1) according to an embodiment of the present invention includes a plurality of Transistors M1', M2', M3', M4', M5', M6', and M7', and storage The second organic light emitting diode OLED2 may include a capacitor Cst1′ and a second organic light emitting diode OLED2. The pixel circuit PXi(j+1) may correspond to the second pixel circuit B in FIGS.

[0077] The second pixel circuit PXi(j+1) is a single pixel circuit (one per pixel circuit). In FIG. 5, the single initialization voltage source is the first initialization voltage source. In the embodiments of FIGS. 7 and 10 described later, a single initialization voltage is used. When the voltage source is the second initialization voltage source and when the voltage source is the third initialization voltage source, We will explain about this.

[0078] First, the structure of the first pixel circuit PXij will be described.

[0079] One end of the transistor M1 is connected to the other end of the transistor M6, and the other end of the transistor M1 is connected to the other end of the transistor M6. It is connected to one end of M5, and its gate terminal is connected to one end of the storage capacitor Cst1. Transistor M1 may be referred to as the first drive transistor.

[0080] The transistor M2 has one end connected to the first data line Dj and the other end connected to the The other end may be connected to the gate terminal of the current scanning line Si.

[0081] One end of the transistor M3 is connected to the gate terminal of the transistor M1, and the other end of the transistor M2 is connected to the gate terminal of the transistor M1. The gate terminal may be connected to one end of the resistor M1 and the gate terminal may be connected to the scan line Si of the current stage.

[0082] The transistor M4 has one end connected to the first initialization voltage source VINT1 and the other end connected to the drive transistor VINT1. The gate terminal is connected to the gate terminal of the previous scanning line S(i-1). This may also be done.

[0083] One end of the transistor M5 is connected to the other end of the transistor M1, and the other end is connected to the voltage source ELV The gate terminal of the transistor M5 may be connected to the DD, and the gate terminal may be connected to the light emission control line Ei. This may also be called a light-emitting control transistor.

[0084] One end of the transistor M6 is connected to the anode of the first organic light-emitting diode OLED1. , the other end is connected to one end of the transistor M1, and the gate terminal is connected to the light emission control line Ei. The transistor M6 may be called a light-emitting control transistor.

[0085] The transistor M7 has one end connected to the second initialization voltage source VINT2 and the other end connected to the first organic The anode terminal of the light emitting diode OLED1 is connected to the anode, and the gate terminal is connected to the scan line Si of the current row. It may be continued.

[0086] One end of the storage capacitor Cst1 is connected to the gate terminal of the transistor M1. The other end may be connected to a voltage source ELVDD.

[0087] The first organic light-emitting diode OLED1 has an anode connected to the other end of the transistor M7. The cathode may be connected to a voltage source ELVSS. The capacitance Co1 can be determined by the magnitude of the capacitance Co1 and the driving voltage. The time point at which light is emitted may be determined depending on the size of the flow.

[0088] a plurality of transistors M1', M2', M3' in the second pixel circuit PXi(j+1); M4', M5', M6', M7', a storage capacitor Cst1', and a second organic light-emitting The connection structure of the diode OLED2 is such that the plurality of transistors in the first pixel circuit PXij are connected to each other. Transistors M1, M2, M3, M4, M5, M6, M7, storage capacitor Cst1, and the connection structure of the first organic light emitting diode OLED1. The following description will focus on the differences and omit redundant explanations. The second organic light-emitting diode OLED2 may be called a driving transistor. The light-emitting diode OLED1 may contain an organic material having a different band gap from that of the light-emitting diode OLED1.

[0089] One end of the transistor M2' is connected to the second data line D(j+1). Transistor M2' is turned on by the same scan signal as transistor M2, but The data voltage can be supplied to the transistor M1 different from that of the transistor M2.

[0090] One end of the transistor M7' may be connected to the first initialization voltage source VINT1. As mentioned above, the first initialization voltage of the first initialization voltage source VINT1 is The voltage value of the voltage source ELVSS is larger than the first and second initialization voltages of T2. During the second initialization period, which will be described later, the first organic light-emitting diode The capacitance Co1 of the electrode OLED1 is determined by the second initialization voltage source VINT2 and the voltage source EL During the second initialization period, the second organic light emitting diode (OLED) is initialized to a voltage value corresponding to the difference with VSS. The capacitance Co2 of the photodiode OLED2 is determined by the first initialization voltage source VINT1 and the voltage The second organic light-emitting diode is initialized to a voltage value corresponding to the difference between the voltage of the first organic light-emitting diode and the voltage of the second organic light-emitting diode. The capacitance Co2 of OLED2 is precharged to a voltage value higher than the capacitance Co1. Therefore, in the light emitting period after the second initialization period, This has the advantage that the light emitting diode OLED2 can emit light at an earlier time.

[0091] For reference, in the embodiment of FIG. 5, the driving transistors M1 and M1' are Since the voltage source applied to the gate terminal is the same as the first initialization voltage source VINT1, There is no change in the effect due to the transistors M1 and M1'.

[0092] FIG. 5 shows only the first pixel circuit PXij and the second pixel circuit PXi(j+1). The third pixel circuit has the same configuration as the first pixel circuit P except that it has a third organic light emitting diode. The first organic light-emitting diode OL may have substantially the same structure as Xij. If ED1 is a red organic light-emitting diode, the third organic light-emitting diode is a blue organic light-emitting diode. On the other hand, the first organic light emitting diode OLED1 may be a blue organic light emitting diode. If the third organic light emitting diode is a red organic light emitting diode, Good too.

[0093] The third pixel circuit is connected to the first initialization voltage source VINT1 and the second initialization voltage source VINT2. The first organic light emitting diode OLED1 and the second organic light emitting diode OLED2 are connected to a band The third pixel circuit may include a third organic light-emitting diode including an organic material having a different band gap. The third pixel circuit may have one end connected to the first data line Dj during the light emission period. The third driving transistor may be connected to the anode of the third organic light emitting diode. The first initialization voltage source is connected to the gate terminal of the third driving transistor during the first initialization period, and the second The initialization voltage source may be connected to the anode of the third organic light-emitting diode during the second initialization period. .

[0094] FIG. 6 is a diagram for explaining a method of driving the pixel circuit of FIG.

[0095] First, at time t1, the previous data voltage DATA(i-1) is applied via the first data line Dj. j is supplied, and the previous data voltage DATA(i-1) is supplied via the second data line D(j+1). At this time, the previous scanning line S(i-1) is supplied with a low-level signal. A signal is applied, turning on transistors M4 and M4'.

[0096] Therefore, the gate terminal of the first drive transistor M1 and the gate terminal of the second drive transistor M1' A first initialization voltage source VINT1 is connected to the gate terminal of each of the driving transistors M1 and M1'. The period between time t1 and time t2 is called the first initial This can be called the transformation period.

[0097] During the first initialization period, the transistors other than the transistors M4 and M4' are turned on. It may be in a non-transitory state.

[0098] Next, at time t2, a high-level previous scanning signal is applied to the previous scanning line S(i-1). The transistors M4 and M4' are turned off. The gate voltage values ​​of the storage capacitors Cst1 and Cst1' are Hold.

[0099] Next, at time t3, the data voltage DATAij of the current stage is applied via the first data line Dj. The data voltage DATAi(j+1) of the current stage is supplied via the second data line D(j+1). At this time, a low level scan signal of the current stage is applied to the scan line Si of the current stage. , transistors M2, M3, M7, M2', M3' and M7' are turned on.

[0100] Transistors M3 and M3' are turned on, causing the respective drive transistors M1 and M 1' is diode-connected. The voltage corresponding to the data voltage DATAij of the current stage is The signal is input to the gate terminal of the first drive transistor M1 via the transistors M2, M1, and M3. Also, a voltage corresponding to the data voltage DATAi(j+1) of the current stage is applied to the transistor M 2', M1', and M3', and is input to the gate terminal of the second driving transistor M1'. .

[0101] The transistor M7 is turned on, and the second initialization voltage source VINT2 is applied to the first organic light-emitting diode (OLED). It is connected to the anode of the diode OLED1. Also, the transistor M7' is turned on. The first initialization voltage source VINT1 is connected to the anode of the second organic light-emitting diode OLED2. As described above, the capacitance C of the second organic light-emitting diode OLED2 O2 is precharged to a higher voltage value than capacitance Co1.

[0102] The period between time t3 and time t4 is referred to as a data writing period and a second initialization period. During this period, the transistors M6 and M6' are turned off. Therefore, the voltage required for writing data and the voltage required for initialization are separated and do not affect each other. do not have.

[0103] However, in this embodiment, the second initialization period is set to the same period as the data writing period. The second initialization period begins with the transistors M7 and M7' being connected to the previous scanning line S(i-1). The interval may be set in various ways.

[0104] Then, at time t4, transistors M2, M3, M7, M2', M3', and M7' are turned on. Each storage capacitor Cst1 is connected to the corresponding drive transistor M1, M1'. The voltage applied to the gate terminal is maintained.

[0105] Next, at time t5, a low-level voltage is applied to the light emission control line Ei, and the transistor M5, M6, M5', and M6' are turned on. Therefore, the voltage source ELVDD is turned off. A current path is formed in ELVSS and becomes conductive, and the gates of the drive transistors M1 and M1' The magnitude of the drive current is determined according to the difference between the voltage and the source voltage.

[0106] The light emission time of the organic light emitting diodes OLED1 and OLED2 depends on the magnitude of each driving current and each The capacitances Co1 and Co2 can be determined by the magnitude of the second capacitance. The capacitance Co2 of the light-emitting diode OLED2 is higher than the capacitance Co1. Since the second organic light emitting diode OLED2 is precharged to the voltage value, the light emitting point of the second organic light emitting diode OLED2 is Therefore, it is possible to eliminate the color bleeding phenomenon explained in Figure 3. It is possible.

[0107] The period from time t5 until a high-level voltage is applied to the light-emission control line Ei is called the light-emission period. You may attach it.

[0108] FIG. 7 illustrates a case where the connection configuration of the initialization voltage source is changed in the pixel circuit of FIG. 8 is for explaining the effect of increasing the current by the configuration of FIG. do.

[0109] Comparing FIG. 7 with FIG. 5, the first pixel circuits PXij have the same configuration. However, The single initialization voltage of the second pixel circuit PXi(j+1) becomes the second initialization voltage VINT2. There is a difference in the structure in that

[0110] At this time, unlike the case of FIG. 5, the capacitance of the second organic light emitting diode OLED2 The capacitance Co2 is precharged to the same voltage value as the capacitance Co1. The voltage value has no useful effect.

[0111] However, in this embodiment, during the first initialization period, the second driving transistor of the second pixel circuit PXi(j+1) At the point where the second initialization voltage source VINT2 is connected to the gate terminal of the transistor M1' It has its own characteristics.

[0112] As described above, the second initialization voltage of the second initialization voltage source VINT2 is The voltage value of the voltage source ELVDD is smaller than the first initialization voltage of VINT1. It may be greater than the second initialization voltage.

[0113] Therefore, the gate voltage and source voltage of the second driving transistor M1' set in the first initialization period The difference between the gate voltage and the source voltage of the first drive transistor M1 is larger than the difference between the gate voltage and the source voltage of the first drive transistor M2. That is, the on-bias voltage (on-bias vol tage) becomes larger than the on-bias voltage of the first drive transistor M1.

[0114] The inventor of this embodiment has determined that when the on-bias voltage increases, the driving It was found that the current increased.

[0115] Referring to FIG. 8, the second driving transistor at time t5 in FIG. 6, i.e., the start of the light emitting period, The characteristic curve CC1 of the transistor M1' is shown. As shown in the figure, the magnitude of the drive current value depends on the difference between the gate voltage and the source voltage, VGS (V). Represents ID(A).

[0116] When a voltage PT1 corresponding to an arbitrary grayscale value is applied to the second driving transistor M1′, The level CL1 of the drive current flowing through the transistor 1 is indicated by a straight line.

[0117] As the light emission period progresses, the characteristic curve moves to the right, and the degree to which it moves to the right depends on the on-bias The increase in the voltage can be proportional to the increase in the power supply voltage.

[0118] FIG. 8 shows an example of a characteristic curve CC2 after 16 ms has elapsed since the light emission period. The absolute value of the voltage PT2 decreases due to the decrease in the amount of charge stored in the storage capacitor Cst1'. Although the characteristic curve CC2 has shifted to the right compared to the characteristic curve CC1, the Verify that the drive current level CL2 after ms has increased from the previous level CL1. can be done.

[0119] Therefore, according to the embodiment of FIG. 7, the driving voltage during the light emission period of the second pixel circuit PXi(j+1) is By increasing the amount of electromotive current, the light emission start time of the second organic light emitting diode OLED2 is advanced. , and the luminance of light emitted can be improved.

[0120] That is, the embodiment of FIG. 7 can also eliminate the color bleeding phenomenon described with reference to FIG. .

[0121] FIG. 9 is a diagram for explaining a display device according to another embodiment of the present invention, and FIG. FIG. 10 is a diagram illustrating a pixel circuit connected to an initialization voltage source according to another embodiment of the present invention.

[0122] The display device 9' of FIG. 9 is different from the display device 9 of FIG. 1 in that the third initialization voltage source VINT3 is and further comprising: providing a third initialization voltage to the second pixel circuit PXi(j+1) as a single initialization voltage source. The difference is that the source VINT3 is connected to the display device 9'. 9, so a duplicate explanation will be omitted.

[0123] Referring to FIG. 10, in the second pixel circuit PXi(j+1), the third initialization voltage source VI NT3 is connected to the anode of the second organic light-emitting diode OLED2 through transistor M7'. and connected to the gate terminal of the second drive transistor M1' via transistor M4' will be done.

[0124] The third initialization voltage of the third initialization voltage source VINT3 in this embodiment is the first and second initialization voltages In one embodiment, the third initialization voltage is different from the first initialization voltage, the second initialization voltage, and For example, the first initialization voltage may be −2 V and the second initialization voltage may be −5 V. In this case, the third initialization voltage may be −4V.

[0125] According to this embodiment, the first initialization voltage source VINT1 and the second initialization voltage source VINT2 are different from each other. 5 and 7. However, the disadvantage is that an additional voltage source is required. The advantage of this embodiment is that it is possible to have the advantages of both the embodiments.

[0126] That is, the capacitance Co2 of the second organic light emitting diode OLED2 is Since the second organic light-emitting diode OLED2 is precharged to a voltage higher than Co1, The light emission start time can be advanced.

[0127] The difference between the gate voltage and the source voltage of the second driving transistor M1' is Since the difference between the gate voltage and the source voltage of transistor M1 is larger, the on-bias voltage value As the voltage rises, the driving current increases over time during the light-emitting period, and the second organic light-emitting diode It can accelerate the light emission start time of OLED2 and improve the light emission brightness. do.

[0128] FIG. 11 is a diagram for explaining the case where the embodiment of FIG. 5 is applied to another pixel circuit.

[0129] Referring to FIG. 11, the first pixel circuit PXij′ includes a plurality of transistors M8, M9, M 10, M11, M12, a storage capacitor Cst2, and a first organic light-emitting diode O The second pixel circuit PXi(j+1)' includes a plurality of transistors M8 ', M9', M10', M11', M12', storage capacitor Cst2', and The second pixel circuit PXi(j+1)' has the following structure: The structure of the first pixel circuit PXij′, the data line, the initialization voltage source, and the organic light-emitting diode Since they are substantially the same except for the first pixel circuit PXij′, only the first pixel circuit PXij′ will be described below. do.

[0130] The transistor M8 has one end connected to the other end of the transistor M10 and the other end connected to the voltage source EL The gate terminal of the transistor M9 is connected to the other end of the transistor M1. 8 may be named the first drive transistor.

[0131] The transistor M9 has one end connected to the first data line Dj and the other end connected to the The gate terminal is connected to the scanning line Si of the current stage.

[0132] The transistor M10 has one end connected to the first organic light emitting diode OLED11 and the other end may be connected to one end of the transistor M8, and the gate terminal may be connected to the light emission control line Ei. Transistor M10 may be named the light emission control transistor.

[0133] The transistor M11 has one end connected to the first initialization voltage VINT1 and the other end connected to the stray The gate terminal is connected to one end of the capacitor Cst2, and the gate terminal is connected to the previous scan line S(i-1). This may be done.

[0134] The transistor M12 has one end connected to the second initialization voltage VINT2 and the other end connected to the first organic The gate terminal is connected to the light emitting diode OLED11 and the gate terminal is connected to the scan line Si of the current stage. Good too.

[0135] One end of the storage capacitor Cst2 is connected to the gate terminal of the transistor M8. The other end may be connected to a voltage source ELVDD.

[0136] The anode of the first organic light-emitting diode OLED11 is connected to the other end of the transistor M12. The cathode may be connected to a voltage source ELVSS.

[0137] The control signals of the pixel circuits PXij' and PXi(j+1)' in FIG. 11 are the same as those of the pixel circuits PX ij, PXi(j+1) are the same as the control signals, so the detailed explanation of the driving process is omitted. Abbreviated.

[0138] In the embodiment of FIG. 11, similarly to the embodiment of FIG. 5, a single initialization voltage source is a first initialization voltage source VIN In the case of T1, the capacitance of the second organic light-emitting diode OLED12 is The LED OLED11 is precharged to a voltage higher than the capacitance of the LED OLED11. Therefore, the light emission of the second organic light emitting diode OLED12 in the light emitting period after the second initialization period The advantage is that the start time can be earlier.

[0139] FIG. 12 is a diagram for explaining the case where the embodiment of FIG. 7 is applied to another pixel circuit. do.

[0140] In the embodiment of FIG. 12, the single initialization voltage source is the second initialization voltage source VINT2. 11. The other configurations are the same as those in FIG. 11, so duplicated explanations will be omitted. Abbreviated.

[0141] In the embodiment of FIG. 12, similarly to the embodiment of FIG. 7, a single initialization voltage source is provided as the second initialization voltage source VI In the case of NT2, the amount of drive current during the light emission period of the second pixel circuit PXi(j+1)' By increasing the amount of light emitted, the light emission start time of the second organic light emitting diode OLED12 can be advanced or the light emission time can be increased. The brightness can be improved.

[0142] FIG. 13 is a diagram for explaining the case where the embodiment of FIG. 10 is applied to another pixel circuit.

[0143] In the embodiment of FIG. 13, the single initialization voltage source is the third initialization voltage source VINT3. 11. The other configurations are the same as those in FIG. 11, so duplicated explanations will be omitted. Abbreviated.

[0144] 10, the embodiment of FIG. 13 also has a single initialization voltage source and a third initialization voltage source V In the case of INT3, the first initialization voltage source VINT1 and the second initialization voltage source VINT2 11. However, it has the disadvantage of requiring an additional voltage source different from that of the embodiment of FIG. The advantage of this embodiment is that it has both the advantages of the embodiment shown in FIG.

[0145] That is, the capacitance of the second organic light emitting diode OLED12 is Since the second organic EL element 11 is precharged to a voltage value higher than the capacitance of the first organic EL element 11, The light emitting diode OLED12 can start emitting light earlier.

[0146] Also, the difference between the gate voltage and the source voltage of the second driving transistor M8' is Since the difference between the gate voltage and source voltage of transistor M8 is larger, the on-bias voltage value As the voltage rises, the driving current increases over time during the light-emitting period, and the second organic light-emitting diode It can accelerate the light emission start time of the OLED12 and improve the light emission brightness. do.

[0147] The drawings referred to above and the detailed description of the invention given above are merely illustrative of the invention. It is used solely for the purpose of explaining the present invention and is not intended to be limiting or limiting in any way. It is not intended to limit the scope of the invention described herein. Those skilled in the art will recognize that various modifications and equivalent alternative embodiments are possible. Therefore, the technical scope of protection of the present invention is as defined in the accompanying claims. It should be determined by the technical concept of the scope.

[0148] As used herein, terms such as "connected" and "electrically connected" refer to directly or Not only when connected through a separate conductor or wire, but also when connected in the middle of the path When a switching element such as a transistor is turned on, it becomes electrically conductive. Also, for example, "(a) is ~, (b) is ~, and (c) may be ~." When sentences are connected like this, "(a)~", "(b)~" and "(c)~" are each independent. In other words, for example, neither "(a)~" nor "(c)~" is valid, but " (b) This includes cases where only "~" is true.

[0149] According to some preferred embodiments, the problem to be solved and specific means for solving it are: , as follows:

[0150] The pixels are arranged to display an image, and each pixel is an organic light-emitting diode of one of the primary colors. In display devices composed of organic light-emitting diodes, green organic light-emitting diodes have high luminous efficiency. Therefore, the light emitting area is made small and the driving current is set to a low level.

[0151] The green organic light-emitting diode OLED2 has a low driving current level, so the capacitor The time it takes to charge the OLED display is significantly shorter than that of other colors such as red and blue. This is longer than ED1. Therefore, the timing of the light emission start is different from that of other organic light sources. It is slower than the light-emitting diode OLED1. As a result, scrolling the screen Sometimes, color blur may appear on the display screen.

[0152] Therefore, at least one of A and B below will be applied.

[0153] A. Light-emitting period during which drive current is continuously supplied to each of the organic light-emitting diodes OLED1 and OLED2 (see FIG. 6). During the data writing period (t3 to t4 in Figure 6) immediately before t5 or later, the capacitance of each organic light-emitting diode is When precharging capacitances Co1 to Co2, The capacitance Co2 of the green organic light-emitting diode OLED2 is It is precharged to a voltage value higher than the capacitance Co of the diode OLED1. To do so.

[0154] This allows the light emission start time to be further advanced.

[0155] B As shown in Figure 8, the on-bias voltage (on-bias v oltage) for green organic light-emitting diode OLED2, other colors higher than that for the organic light-emitting diode OLED1.

[0156] This allows the green organic light-emitting diode OLED2 to start emitting light earlier and the luminance of the light to be increased. It is possible to improve the degree.

[0157] Specifically, assuming C below, the following will be one of D to F.

[0158] C In each embodiment of Figures 5, 7 and 11 to 13, The pixel circuit PXij including the organic light emitting diode OLED1 of another color has Through transistor M4, the storage capacitor is turned on in response to the gate pulse from the previous scan line. a first initialization voltage source VINT1 (for example, −2 V) for initializing the capacitor CSt1; Through transistor M7, the organic light emitting diode is turned on in response to the gate pulse from the scan line of the current stage. A second initialization voltage source VINT2 (e.g., VINT2) is used to precharge the capacitance Co1 of the diode. For example, -5V) is provided.

[0159] D In order to achieve the above A, as shown in Figures 5 and 11, The pixel circuit PXi(j+1) including the green organic light-emitting diode OLED1 has a first Only the initialization voltage source VINT1 (for example, -2V) is used as the initialization voltage source (single initialization voltage source). The higher voltage from the first initialization voltage source VINT1 (for example, −2 V) During the data write period (t3 to t4 in Figure 6), the capacitance Co2 is precharged. .

[0160] E In order to achieve B above, as shown in Figures 7 and 12, The pixel circuit PXi(j+1) including the green organic light-emitting diode OLED1 has a second first Only the initialization voltage source VINT2 (for example, -5V) is used as the initialization voltage source (single initialization voltage source). It can be prepared.

[0161] As a result, the first initialization period (t3 to t4 in FIG. 6) before the data write period (t4 to t6 in FIG. 6) begins. At t1 to t2, the gate terminal of the driving transistor M1' is connected to the first initialization voltage source VINT1 (e.g., A second initialization voltage (for example, -5V) having a potential difference larger than the first initialization voltage (for example, -2V) is applied. In other words, in this way, the on-bias voltage of the drive transistor M1' is increased.

[0162] F In order to achieve A and B above, as shown in Figures 10 and 13, The pixel circuit PXi(j+1) including the green organic light-emitting diode OLED1 has a third first Only the initialization voltage source VINT3 (for example, -4V) is used as the initialization voltage source (single initialization voltage source). The third initialization voltage is a value between the first initialization voltage and the second initialization voltage.

[0163] Although an additional voltage source (power line) is required, both the effects of A and B above can be achieved. do. [Explanation of symbols]

[0164] 9 Display device 10 Scanning driver 20 Data Drive Unit 30 Light emission control drive unit 40 Timing control section 50 pixel section

Claims

1. a first pixel circuit including a first driving transistor, a first initialization transistor, a first anode initialization transistor, and a first light emitting diode that emits light of a first color; a second pixel circuit including a second driving transistor, a second initialization transistor, a second anode initialization transistor, and a second light-emitting diode that emits light of a second color different from the first color; the first drive transistor is connected between a first voltage source and a second voltage source, and determines a first drive current according to a voltage difference between a gate electrode of the first drive transistor and a first electrode of the first drive transistor; a first initialization transistor including a first electrode connected to the gate electrode of the first drive transistor; the first light emitting diode includes a first anode electrode receiving the first driving current and a first cathode electrode connected to the second voltage source; the first anode initialization transistor includes a first electrode connected to the first anode electrode; the second drive transistor is connected between a first voltage source and a second voltage source, and determines a second drive current according to a voltage difference between a gate electrode of the second drive transistor and a first electrode of the second drive transistor; the second initialization transistor includes a first electrode connected to a gate electrode of the second drive transistor; the second light emitting diode includes a second anode electrode receiving the second driving current and a second cathode electrode connected to the second voltage source; the second anode initialization transistor includes a first electrode connected to the second anode electrode; When the first initialization transistor and the second initialization transistor are turned on, the same voltage having the same voltage level is applied to the gate electrode of the first driving transistor and the gate electrode of the second driving transistor through the first initialization transistor and the second initialization transistor, respectively; when the first anode initialization transistor and the second anode initialization transistor are turned on, different voltages having different voltage levels are applied to the first anode electrode and the second anode electrode through the first anode initialization transistor and the second anode initialization transistor, respectively; The capacitance of the second light emitting diode is greater than the capacitance of the first light emitting diode; a voltage level applied to the second anode electrode when the first anode initialization transistor and the second anode initialization transistor are turned on is higher than a voltage level applied to the first anode electrode.

2. The display device according to claim 1 , wherein the second light emitting diode has a light emitting surface area smaller than that of the first light emitting diode.

3. 2. The display device according to claim 1, wherein a voltage applied to the gate electrode of the first driving transistor is different from a voltage applied to the first anode electrode.

4. 4. The display device according to claim 3, wherein a voltage applied to the gate electrode of the first driving transistor is greater than a voltage applied to the first anode electrode.

5. a third pixel circuit including a third driving transistor, a third initialization transistor, a third anode initialization transistor, and a third light-emitting diode that emits light of a third color different from the first color and the second color; the third drive transistor is connected between a first voltage source and a second voltage source, and determines a third drive current according to a voltage difference between a gate electrode of the third drive transistor and a first electrode of the third drive transistor; the third initialization transistor includes a first electrode connected to a gate electrode of the third drive transistor; the third light emitting diode includes a third anode electrode receiving the third driving current and a third cathode electrode connected to the second voltage source; the third anode initialization transistor includes a first electrode connected to the third anode electrode; When the third anode initialization transistor is turned on, a voltage applied to the third anode electrode through the third anode initialization transistor is equal to a voltage applied to the first anode electrode; The display device of claim 1 , wherein the third light emitting diode has a capacitance different from the capacitances of the first light emitting diode and the second light emitting diode.

6. a first voltage source providing a first voltage; a second voltage source providing a second voltage having a different voltage level than the first voltage; a first initialization voltage source for providing a first initialization voltage; a second initialization voltage source for providing a second initialization voltage having a voltage level different from that of the first initialization voltage; A timing control unit; a data driver; a display unit; The display unit a first pixel circuit including a first driving transistor, a first initialization transistor, a first anode initialization transistor, and a first light emitting diode that emits light of a first color; a second pixel circuit including a second driving transistor, a second initialization transistor, a second anode initialization transistor, and a second light-emitting diode that emits light of a second color different from the first color; the first drive transistor is connected between a first voltage source and a second voltage source, and determines a first drive current according to a voltage difference between a gate electrode of the first drive transistor and a first electrode of the first drive transistor; a first initialization transistor including a first electrode connected to the gate electrode of the first drive transistor; the first light emitting diode includes a first anode electrode receiving the first driving current and a first cathode electrode connected to the second voltage source; the first anode initialization transistor includes a first electrode connected to the first anode electrode; the second drive transistor is connected between a first voltage source and a second voltage source, and determines a second drive current according to a voltage difference between a gate electrode of the second drive transistor and a first electrode of the second drive transistor; the second initialization transistor includes a first electrode connected to a gate electrode of the second drive transistor; the second light emitting diode includes a second anode electrode receiving the second driving current and a second cathode electrode connected to the second voltage source; the second anode initialization transistor includes a first electrode connected to the second anode electrode; When the first anode initialization transistor is turned on, the first initialization voltage is applied to the first anode electrode through the first anode initialization transistor; When the second anode initialization transistor is turned on, the second initialization voltage is applied to the second anode electrode through the second anode initialization transistor; When the first initialization transistor and the second initialization transistor are turned on, the same voltage having the same voltage level is applied to the gate electrode of the first driving transistor and the gate electrode of the second driving transistor through the first initialization transistor and the second initialization transistor, respectively; The capacitance of the second light emitting diode is greater than the capacitance of the first light emitting diode; 10. The display device according to claim 9, wherein when the first anode initialization transistor and the second anode initialization transistor are turned on, a voltage level of the second initialization voltage is higher than a voltage level of the first initialization voltage.

7. The display device according to claim 6 , wherein the first initialization voltage is different from a voltage applied to a gate electrode of the first driving transistor.

8. 8. The display device of claim 7, wherein the voltage applied to the gate electrode of the first driving transistor is greater than the first initialization voltage.

9. the first pixel circuit includes a first write transistor electrically connected between a first data line and a second electrode of the first drive transistor; 7. The display device according to claim 6, wherein the second pixel circuit includes a second write transistor electrically connected between a second data line and the second electrode of the second drive transistor.

10. 7. The display device according to claim 6, wherein at least one of the first initialization voltage source and the second initialization voltage source is located at a lower end of the display section.

11. a third pixel circuit including a third driving transistor, a third initialization transistor, a third anode initialization transistor, and a third light-emitting diode that emits light of a third color different from the first color and the second color; the third drive transistor is connected between a first voltage source and a second voltage source, and determines a third drive current according to a voltage difference between a gate electrode of the third drive transistor and a first electrode of the third drive transistor; the third initialization transistor includes a first electrode connected to a gate electrode of the third drive transistor; the third light emitting diode includes a third anode electrode receiving the third driving current and a third cathode electrode connected to the second voltage source; the third anode initialization transistor includes a first electrode connected to the third anode electrode; When the third anode initialization transistor is turned on, a voltage applied to the third anode electrode through the third anode initialization transistor is equal to the first initialization voltage; The display device of claim 6 , wherein the third light emitting diode has a capacitance different from the capacitances of the first light emitting diode and the second light emitting diode.

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