KR20160078618A - Organic light emitting display device - Google Patents

Abstract

The present invention relates to an organic light emitting display device. According to the present invention, a first pixel and a second pixel, two among pixels in an organic light emitting display panel where a plurality of data lines and a plurality of gate lines are arranged and a plurality of pixels are arranged in a matrix type, include a first organic light emitting diode for managing the luminescence of the first pixel and a second organic light emitting diode for managing the luminescence of the second pixel. The first organic light emitting diode and the second organic light emitting diode are controlled by a circuit part connected to two data lines. So, deterioration due to an increase in the current density of the organic light emitting diode can be prevented.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light-

The present invention relates to an organic light emitting display.

2. Description of the Related Art In recent years, an organic light emitting diode (OLED) display device that has been spotlighted as a display device has a high response speed and an excellent contrast ratio, luminous efficiency, luminance, and viewing angle by using an organic light emitting diode (OLED) There are advantages.

Each pixel (or sub-pixel) disposed in the organic light emitting display panel of the organic light emitting display device basically includes an organic light emitting diode and a driving transistor for driving the organic light emitting diode.

In such an organic light emitting display, the brightness of the organic light emitting diode is adjusted by the driving current of the driving transistor determined based on the data voltage output from the data driver, thereby displaying an image.

On the other hand, the driving transistor for driving each pixel on the organic light emitting display panel has a characteristic value such as a threshold voltage and a mobility. In such a driving transistor, as the driving time increases, the degradation proceeds, and the characteristic value changes.

Such deterioration of the driving transistor causes a deviation of intrinsic characteristic values between the driving transistors in each subpixel, resulting in a luminance deviation between the subpixels, which may degrade image quality. When a pixel is constituted by the RGB / WRGB method, the current density of the blue pixel is the highest, and the lifetime of the blue pixel is lowered. Therefore, a technique for lowering the current density of a specific pixel is needed.

One embodiment of the present invention is to provide an organic light emitting display device that prevents deterioration due to an increase in current density of an organic light emitting diode.

One embodiment of the present invention is to provide an organic light emitting display device capable of displaying blue and white colors of pure blue while controlling the blue pixel and the blueish white pixel in a single circuit portion to lower the current density of the blue pixel.

One embodiment of the present invention is to provide an organic light emitting display in which two organic light emitting diodes (OLEDs) are controlled by a single circuit part to reduce the area occupied by the circuit area in the entire panel, thereby increasing the aperture ratio.

The OLED display according to an embodiment of the present invention includes an OLED display panel in which a plurality of data lines and a plurality of gate lines are arranged and a plurality of pixels are arranged in a matrix type, And the second pixel includes a first organic light emitting diode that emits light of the first pixel and a second organic light emitting diode that emits light of the second pixel, and the first organic light emitting diode and the second organic light emitting diode include two And is controlled by one circuit portion connected to the data line.

According to another aspect of the present invention, there is provided an OLED display including a first electrode and a second electrode electrically connected to a driving circuit and a driving circuit at a point where a data line intersects with a gate line, And M + N organic light emitting diodes including organic layers positioned between the second electrodes, wherein M organic light emitting diodes among the organic light emitting diodes are first organic light emitting diodes whose emission is controlled by one data line, And the N organic light emitting diodes are second organic light emitting diodes whose emission is controlled by two data lines.

According to the embodiments of the present invention as described above, the driving current density of a specific pixel is reduced to extend the lifetime of the pixel and also to increase the lifetime of the CCT (Correlated Color Temperature) of the panel.

In addition, according to the embodiments of the present invention, the blue pixel and the blue-white pixel are controlled by a single circuit section to reduce the driving current density to increase the lifetime of the blue pixel, So that the effect of increasing CCT life is provided.

In addition, according to the embodiments of the present invention, since two or more pixels can be controlled by using one circuit portion, the area of the circuit portion can be reduced compared with the region of the entire light emitting portion. In addition, according to the embodiment of the present invention, the lifetime of an organic material can be increased by driving two organic materials in one circuit part.

1 is a schematic system configuration diagram of an organic light emitting display according to the present embodiments.
2 is an equivalent circuit diagram of a sub-pixel SP having a sensing structure of a driving transistor DRT in the OLED display 100 according to the present embodiments.
FIG. 3 is a view showing the current density of each pixel when white is realized. FIG.
4 is a diagram showing a configuration of a circuit section for controlling each pixel.
5 to 7 are views showing a configuration in which blueish white and blue are controlled by a single circuit unit according to an embodiment of the present invention.
FIG. 8 is a view showing a structure in which three circuit portions control four light emitting portions according to another embodiment of the present invention, and the regions of the respective light emitting portions are configured identically.
FIG. 9 is a diagram illustrating a structure in which blueish white and blue are controlled by a single circuit unit according to an embodiment of the present invention. Referring to FIG.
FIG. 10 is a diagram illustrating a configuration of one circuit unit for controlling two pixels according to an exemplary embodiment of the present invention. Referring to FIG.
11 is a graph showing the density of pixel current in an organic light emitting display device including blue-white according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the components from other components, and the terms do not limit the nature, order, order, or number of the components. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; intervening "or that each component may be" connected, "" coupled, "or " connected" through other components.

FIG. 1 is a schematic system configuration diagram of an organic light emitting diode display 100 according to the present embodiments.

1, the OLED display 100 includes an OLED display panel 110, a data driver 120, a gate driver 130, a timing controller 140, and the like .

A plurality of data lines DL1, ..., DLm, m: natural numbers of 2 or more are arranged in the first direction, and a plurality of gate lines (GL1, ..., GLn, n: natural numbers of 2 or more) are arranged, and a plurality of sub-pixels (SP) are arranged in a matrix type.

The data driver 120 supplies a data voltage to the plurality of data lines DL1 to DLm to drive the plurality of data lines DL1 to DLm.

The gate driver 130 sequentially supplies the scan signals to the plurality of gate lines GL1, ..., and GLn to sequentially drive the plurality of gate lines GL1, ..., and GLn.

The timing controller 140 supplies control signals to the data driver 120 and the gate driver 130 to control the operations of the data driver 120 and the gate driver 130.

The timing controller 140 starts scanning in accordance with the timing implemented in each frame and switches the image data Data input from the host system 150 according to the data signal format used by the data driver 120, And outputs the image data (Data ') and controls the data driving at a proper time according to the scan.

The gate driver 130 sequentially supplies a scan signal of an On voltage or an Off voltage to the plurality of gate lines GL1 to GLn under the control of the timing controller 140 And sequentially drives the plurality of gate lines GL1, ..., and GLn.

1, the gate driver 130 may be located on one side of the organic light emitting display panel 110, or may be located on both sides of the organic light emitting display panel 110, depending on the driving method.

In addition, the gate driver 130 may include a plurality of gate driver ICs. The plurality of gate driver ICs may be a Tape Au- tomated Bonding (TAB) May be connected to a bonding pad of the organic light emitting display panel 110 in a COG method or may be implemented in a GIP (Gate In Panel) type and directly disposed on the organic light emitting display panel 110, Therefore, the organic light emitting display panel 110 may be integrated and disposed.

Each of the plurality of gate driver integrated circuits mentioned above may include a shift register, a level shifter, and the like.

The data driver 120 converts the video data Data 'received from the timing controller 140 into a data voltage Vdata of an analog type and supplies the data voltages Vdata to the data lines DL1, DLm to drive the data lines.

The data driver 120 may include a plurality of source driver ICs (also referred to as data driver ICs), which may include tape automation bonding The organic light emitting display panel 110 may be connected to a bonding pad of the organic light emitting display panel 110 or may be directly disposed on the organic light emitting display panel 110 by a TAB (Tape Au Trimated Bonding) method or a chip on glass (COG) Therefore, the organic light emitting display panel 110 may be integrated and disposed.

Each of the above-mentioned plurality of source driver integrated circuits includes a shift register, a latch, a digital analog converter (DAC), an output buffer, and the like. In some cases, sub-pixel compensation (luminance deviation compensation, (Hereinafter, also referred to as an analog digital converter (ADC)) for sensing an analog voltage value and converting the analog voltage value into a digital value and generating and outputting sensing data.

A plurality of source driver integrated circuits can be implemented by, for example, a chip on film (COF) method. In each of the plurality of source driver integrated circuits, one end is bonded to at least one source printed circuit board (S-PCB) and the other end is bonded to a bonding pad portion of the organic light emitting display panel 110 .

In addition, the host system 150 may include a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input data enable (DE) signal, a clock signal (CLK), and the like to the timing controller 140. [

The timing controller 140 may switch the image data Data input from the host system 150 to the data signal format used by the data driver 120 and output the converted image data Data ' In order to control the data driver 120 and the gate driver 130, a timing signal such as a vertical synchronization signal Vsync, a horizontal synchronization signal Hsync, an input DE signal, and a clock signal is input to generate various control signals And outputs it to the data driver 120 and the gate driver 130.

For example, in order to control the gate driver 130, the timing controller 140 generates a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal GOE : Gate Output Enable) and the like.

The gate start pulse GSP controls the operation start timing of the gate driver integrated circuits constituting the gate driver 130. [ The gate shift clock GSC is a clock signal commonly input to the gate driver integrated circuits, and controls the shift timing of the scan signal (gate pulse). The gate output enable signal GOE specifies the timing information of the gate driver integrated circuits.

The timing controller 140 controls the data driver 120 such that a source start pulse SSP, a source sampling clock SSC, a source output enable signal SOE, And the like.

The source start pulse SSP controls the data sampling start timing of the source driver integrated circuits constituting the data driver 120. The source sampling clock (SSC) is a clock signal that controls the sampling timing of data in each of the source driver integrated circuits. The source output enable signal SOE controls the output timing of the data driver 120. The polarity control signal POL may be further included in the data control signal DCS in order to control the polarity of the data voltage of the data driver 120. [ The source start pulse SSP and the source sampling clock SSC may be omitted if the video data Data 'input to the data driver 120 is transmitted according to the mini LVDS interface standard.

1, an organic light emitting display 100 includes a light emitting diode (OLED) display panel 110, a data driver 120, a gate driver 130, and the like. The OLED display 100 controls various voltages or currents (Not shown) for controlling the power supply. These power controllers are also referred to as power management ICs (PMICs).

2 is an equivalent circuit diagram of a sub-pixel SP having a sensing structure of a driving transistor DRT in the OLED display 100 according to the present embodiments.

2, a driving transistor DRT for driving the organic light emitting diode (OLED) is disposed in each subpixel SP of the organic light emitting display panel 110. Referring to FIG.

Such a driving transistor DRT has intrinsic characteristic values such as threshold voltage and mobility.

As the driving time increases, the driving transistor DRT becomes degraded, and the characteristic value changes.

The degree of deterioration differs for each driving transistor DRT in each sub-pixel, and deviation may occur relative to the intrinsic characteristic value (threshold voltage, mobility) between the driving transistors DRT in each sub-pixel.

This causes a luminance deviation between the subpixels, which may cause the image quality to deteriorate.

Therefore, it is necessary to sense intrinsic characteristic values of the respective driving transistors DRT in order to compensate for the luminance deviation between the subpixels, that is, to compensate for the deviation of intrinsic characteristic values between the driving transistors DRT. The sensing of the intrinsic characteristic value of the driving transistor DRT is hereinafter referred to as "sensing of the driving transistor DRT ".

Accordingly, each sub-pixel in the OLED display panel 110 according to the present embodiment includes a transistor (hereinafter, referred to as a first sensing transistor SENT) which can be used for sensing the driving transistor DRT .

2, the sub-pixel SP having the sensing structure of the driving transistor DRT includes an organic light emitting diode OLED, a driving transistor DRT, a switching transistor SWT, a storage capacitor Cstg ), A first sensing transistor (SENT), and the like.

The driving transistor DRT is a transistor for driving the organic light emitting diode OLED by supplying a driving current to the organic light emitting diode OLED. The driving transistor DRT includes a first electrode (e.g., an anode electrode or a cathode electrode) of the organic light emitting diode OLED, (Hereinafter, referred to as " N2 node ") and a driving voltage line (DVL: driving voltage line) electrically connected to the gate node (Hereinafter referred to as "N3 node").

The switching transistor SWT is controlled by a scan signal SCAN applied to the gate node GL through the gate line GL and is electrically connected between the node N2 of the driving transistor DRT and the data line DL .

The storage capacitor Cstg is electrically connected between the N1 node and the N2 node of the driving transistor DRT and serves to maintain a constant voltage for one frame.

The first sensing transistor SENT is controlled by a first sense signal SENSE which is a type of a scan signal applied to the gate node GL through the corresponding gate line GL ' And is electrically connected between a voltage line (RVL).

Referring to FIG. 2, the OLED display 100 according to the present embodiment is a device for sensing the intrinsic characteristic value of the driving transistor DRT, and includes a reference voltage line RVL, And may further include an analog-to-digital converter (ADC) that senses the voltage of the N1 node.

Here, an analog-to-digital converter (ADC) may be included inside the source driver integrated circuit.

Although not shown in the drawing, the organic light emitting diode display 100 according to the present embodiment includes a node for connecting the node to which the reference voltage line RVL is connected to a node connected to the analog digital converter or a supply node for the reference voltage Vref Switch.

The structure of FIG. 2 can be applied to each of RGB color pixels. That is, the OLED of FIG. 2 is a circuit for controlling one of blue, red, and green pixels.

As shown in FIG. 2, there is one circuit for one pixel that controls one color. The pixels are responsible for on / off of specific colors such as R, G, B and white (W).

FIG. 3 is a view showing the current density of each pixel when white is realized. FIG.

310 implements white color using three RGB pixels. The current density is the lowest in green (G), the middle in red (R), and the highest in blue (B). 320 uses WRGB four pixels to realize white color. In the case of W + 2Color (R-B), red (R) and white (W) are low and blue (B) is the highest. As shown in FIG. 3, when white having a high CCT (correlated color temperature) is implemented, the current density of the blue pixel is the highest.

This is because the efficiency (emission / color filter transmittance efficiency) of a device that emits blue is low, so that the current density of the blue pixel becomes high during driving. Since OLED lifetime of a pixel having a high current density is shorter than that of other pixels, a luminance lifetime and a CCT lifetime are shortened. Particularly, when a display device with an increased CCT is implemented, the luminance of the blue pixel is generally increased, and the luminance lifetime ratio of the OLED is varied, causing a problem of color shift in reliability.

4 is a diagram showing a configuration of a circuit section for controlling each pixel. The light emitting portions 411, 412, 413 and 414 of each pixel and the circuit portions 421, 422, 423 and 424 for controlling the respective pixels are located. One circuit is connected to control one light emitting portion, so that the aperture ratio is reduced. In Fig. 4, the vertical length of each pixel is denoted by h.

Hereinafter, a circuit structure for reducing the current density of a blue pixel having a high current density due to low efficiency (transmission of light emission / color filters) in an OLED panel driven by four pixels (WRGB) will be described in this specification and a driving method using the same. In OLED light emitting devices, the luminance lifetime is decreased in inverse proportion to the driving current density. In general, since the current density of the blue pixel is high, the luminance degradation is the largest and quickest among the four pixels. The non-uniformity of the luminance lifetime between the four pixels causes a problem of CCT deformation, which is called a CCT lifetime.

In one embodiment of the present invention, blueish white is implemented using a translucent blue color filter for an existing white pixel, thereby preventing a phenomenon in which a current density is increased in a blue pixel when a screen having a high color temperature is implemented do. In addition, it is also possible to improve the aperture ratio by introducing a sub-sub pixel structure that implements two colors of blue and blue within a single pixel (or sub-pixel). Increasing the CCT lifetime can improve reliability.

Hereinafter, the present invention provides a technique for reducing the current density of a blue pixel having a high current density due to low efficiency (emission / color filter transmission) in an OLED panel driving four pixels (WRGB). In OLED light emitting devices, the luminance lifetime is decreased in inverse proportion to the driving current density. In general, since the current density of the blue pixel is high, the luminance deterioration among the four pixels is the largest and quickest. The luminance lifetime unevenness between the four pixels is caused by the CCT deformation, which is called the CCT lifetime. The present invention realizes Bluish White using a translucent blue color filter in a conventional white pixel and prevents a current density from being increased in a blue pixel when a color temperature is high. In addition, it is also possible to improve the aperture ratio by introducing a sub-sub pixel structure which is a structure that implements two pixels of blue and blue in a single pixel (sub-pixel). By increasing the CCT lifetime, the reliability of the entire panel can be improved.

5 to 7 are views showing a configuration in which blueish white and blue are controlled by a single circuit unit according to an embodiment of the present invention. The red light emitting portion 501 and the green light emitting portion 502 are controlled by circuit portions 521 and 522, respectively. On the other hand, the blue light emitting portion 503 and the blue light white light emitting portion 504 are controlled by a single circuit portion 523. Therefore, as compared with FIG. 4, since the number of the circuit portions is reduced from four to three, the light emitting region has an effect of increasing the size of one circuit portion.

In Fig. 5, the increase of the luminescent region shows an embodiment in which the height of the blue-shiny white light emitting portion 504 is increased from h to h1. FIG. 6 shows an embodiment in which the blue light emitting portion 503 is increased. And the height of the blue light emitting portion 503 increases from h to h1.

7 is an embodiment showing that the light emitting region is uniformly increased in the blue light emitting portion 503 and the blue light white light emitting portion 504. The present invention can be applied to increase the sizes of the blue light emitting portion 503 and the blue light white light emitting portion 504 by a predetermined size by locating the circuit portion under two light emitting portions. The height of the blue light emitting portion 503 and the blue light white portion 504 increased from h to h2 as compared to Fig.

FIG. 8 is a view showing a structure in which three circuit portions control four light emitting portions according to another embodiment of the present invention, and the regions of the respective light emitting portions are configured identically. The red light emitting portion 501 and the green light emitting portion 502 are controlled by the circuit portions 521 and 522 respectively and the blue light emitting portion 503 and the blue light white light emitting portion 504 Is controlled by a single circuit portion 523. The respective circuit portions 521, 522 and 523 are formed in the lower end of the light emitting region in an even manner so that all of the light emitting portions 501, 502, 503 and 504 correspond to the light emitting portions 411, 412, 413, 414). ≪ / RTI > That is, the height of the entire light emitting portion increased from h to h3.

As shown in FIG. 5, the color filter of the organic light emitting diode 504 controlled by two data lines may be a color to which white is added to another organic light emitting diode 503 controlled by the same circuit portion 523. For example, if the color filter of the organic light emitting diode 503 is red, the color filter of the organic light emitting diode 504 may be reddish white added with red. When the color filter of the organic light emitting diode of 503 is green, the color filter of the organic light emitting diode of 504 may be greenish white added with green and white. That is, the organic light emitting diode 503 controls to emit light in the case of displaying the pure color, and the organic light emitting diode 504 controls the light emission with the organic light emitting diode 503 in the case of expressing the color having the white color element, The current density of the organic light emitting diode of 503 is lowered to increase the lifetime of the organic light emitting diode of 503. In addition, by reducing the area occupied by the circuit portion, the aperture ratio is increased.

FIG. 9 is a diagram illustrating a structure in which blueish white and blue are controlled by a single circuit unit according to an embodiment of the present invention. Referring to FIG. As shown in FIG. 2, a gate of the driving transistor is connected to the gate of the OLED element, more specifically, the blue OLED element 810, which is a first OLED element that exhibits blue color, as N2. The gate terminal of the switching transistor SWT2 that controls the OLED element 820 that exhibits the second color such as Bluesch White is controlled by a separate data line Data [ii], and the OLED element 820 is controlled One end of the switching transistor SWT2 is connected to N1 and the other end is connected to the OLED element 820. [ Thus, when a signal is applied to Data [i] to emit a first OLED element 810 and a signal is applied to Data [ii], if the scan signal is given as GL, .

As shown in FIGS. 5 to 8, according to an embodiment of the present invention, M pixels are controlled not by M circuit parts but by N circuit parts smaller than M, and any two or more of them are one And is controlled by a circuit section.

That is, as shown in FIG. 1, the OLED display panel includes a plurality of data lines and a plurality of gate lines. In addition, a plurality of pixels formed at the intersections of the data lines and the gate lines are arranged in the organic light emitting display device in a matrix type. A data driver 120 driving the data lines, a gate driver 130 driving the gate lines, and a timing controller 140 controlling the drivers 120 and 130 are coupled to the display device. Among them, the data line is shown in FIG.

In FIG. 9, a plurality of pixels PXL 1,..., N-1, n, n + 1,. Each pixel is provided with an organic light emitting diode. The organic light emitting diodes PXL n and PXL n + 1 are controlled by a single circuit n and two data lines Data [n] and Data [n + 1], and the data signals applied to the two data lines are applied as input signals. That is, the light emission of the two organic light emitting diodes constituting the two pixels is controlled by one circuit part, and the light emission of the two organic light emitting diodes is performed on the two data lines Data [n] and Data [n + 1] . In one embodiment, on / off of two pixels can be controlled by a combination of data lines as shown in Table 1 below.

Data [n] Data [n + 1] PXL n PXL n + 1 Data On Data On On On Data On Data Off On Off Data Off Off Off

As shown in Table 1, when a signal is applied to Data [n], PXL n emits light. On the other hand, when a signal is applied to Data [n + 1], PXL n + 1 emits light. However, if no signal is applied to Data [n], neither PXL n nor PXL n + 1 emits light. Therefore, PXL n + 1 can selectively emit light in accordance with the signal Data [n + 1] when PXL n emits light. As shown in FIGS. 5 to 8, the blue light emitting portion 503 corresponds to PXL n and the blue light white portion 504 corresponds to PXL n + 1. This is because the blue-shiny white light-emitting portion 504 selectively emits light according to the light emission of the blue light-emitting portion 503, which is controlled by one circuit (Circuit n). A color filter having a white tone in the color of PXL n may be formed in PXL n + 1. For example, when a red color filter is formed on PXL n, a color filter of a redish-white may be formed on PXL n + 1. When a red color filter is formed on PXL n, a color filter of a redish-white may be formed on PXL n + 1. That is, the color filter of PXL n + 1 may be a color to which white is added to the color of the color filter of PXL n. As a result, when white is expressed, PXLn and PXLn + 1 are emitted together to lower the current density of PXL n.

One transistor may be added to the circuit section to control the emission of two pixels in one circuit section.

FIG. 10 is a diagram illustrating a configuration of one circuit unit for controlling two pixels according to an exemplary embodiment of the present invention. Referring to FIG.

The circuit portion of Fig. 10 is a circuit portion in which two data lines Data [ii] and Data [i] are applied. There are two organic light emitting display devices 1010 and 1020 and a first transistor DRT 1011 for driving the first organic light emitting diode 1010 and a second transistor DRT 1011 for driving the second organic light emitting diode 1020. [ SWT2, 1021 are the main constituent circuits. The first transistor DRT 1011 is controlled by a signal applied to the first data line Data [i] and a scan signal to drive the first organic light emitting diode 1011. More specifically, the first transistor DRT 1011 includes a first node N1 electrically connected to the first electrode of the first organic light emitting diode 1011, a second node N2 corresponding to the gate node, And a third node N3 electrically connected to the driving voltage line DVL to which the voltage VDD is applied. The second transistors SWT2 and 1021 are controlled by a signal applied to the first data line Data [i] and a signal applied to the second data line Data [ii], and the second organic light emitting diode 1020, .

The second transistors SWT2 and 1021 are connected at one end to the first node N1 of the driving transistor DRT 1011 and at a fifth node N5 connected to the first electrode of the second organic light emitting diode 1020 And the other end is connected and controlled by a second data line Data [ii] applied to a fourth node N4 which is a gate node. Since the gate node N2 of the first transistor 1011 and one end of the second transistor 1021 are connected to each other, the second switching transistor 1021 is connected to the first data line Data [i] .

The first organic light emitting diode 1010 is controlled by the first data line Data [i] while the second organic light emitting diode 1020 is controlled by the first data line Data [i] and the second data line Data [ ii]), so that when two data lines are provided, two organic light emitting diodes can be controlled by one circuit. Here, the second organic light emitting diode 1020 selectively emits light only when the first organic light emitting diode 1010 emits light, so that the current density of the first organic light emitting diode 1010 is lowered.

More specifically, the first switching transistors SWT1 and SWT1, which control the light emission of the first organic light emitting diode 1020 and the second organic light emitting diode 1021, are controlled by a scan signal applied to the gate node, DRT, 1011 and the first data line Data [i].

The first storage capacitor Cstg1 is electrically connected between the first node N1 and the second node N2 of the driving transistor DRT1011. The sensing transistor 1031 is controlled by a sense signal applied to the gate node and is electrically connected between the first node N1 of the driving transistor DRT 1011 and the reference voltage line RVL to which Vref is applied.

A second storage capacitor Cstg2 electrically connected between the fourth node N4 and the fifth node N5 of the second switching transistors SWT2 and 1021 is located. A third storage capacitor Cstg3 electrically connected between the fifth node N5 and the base low voltage line to which the base voltage VSS is applied is located.

10, when a signal is applied to the first driving transistor 1011, a signal is applied to the source side of the second transistor 1021 of the second organic light emitting diode 1020. In addition, Data [ii] The second organic light emitting diode 1020 emits light when a signal is applied to the gate of the second transistor 1021 through the fourth node N4 so that the light emitting condition of the second organic light emitting diode 1020 is the same as that of the two data lines Data [i], Data [ii]) needs to be applied to both signals. Accordingly, one transistor 1021 and a data line may be added to one circuit part to control two organic light emitting diodes 1020, and the first organic light emitting diode 1010 may emit light The current density of the first organic light emitting diode 1010 is lowered.

Referring to the structure of FIG. 10, the first organic light emitting diode 1010 emits light by a signal applied to the first data line Data [i]. The second organic light emitting diode 1020 emits light when a signal is applied to the first data line Data [i] and a signal is applied to the second data line Data [ii]. The first organic light emitting diode 1010 may have one of red, green, and blue color filters, and the second organic light emitting diode 1020 may have a color filter of the first organic light emitting diode 1010. A color filter of the added color may be located. As described above, when the first organic light emitting diode 1010 is red, the second organic light emitting diode 1020 is in redish white, and when the first organic light emitting diode 1010 is green, The second organic light emitting diode 1020 may be blueish white when the first organic light emitting diode 1010 is blue. Accordingly, in order to display the red, green, and blue colors, the first organic light emitting diode 1010 and the second organic light emitting diode 1020 may emit light in order to emit light and display white light. have.

11 is a graph showing the density of pixel current in an organic light emitting display device including blue-white according to an embodiment of the present invention. 2 and 3, it can be confirmed that the current density of blue (B) is low. This causes blue light (BW) to emit light, thereby lowering the current density of blue (B) and increasing the lifetime of the blue pixel.

When implementing the present invention, an OLED panel including a pixel including a white color using an OLED light emitting element or a color filter is provided. One example of a pixel including white color may be Bluish white sub-pixel, but the present invention is not limited thereto. In addition, the present invention can drive two pixels using one driving transistor. To this end, two data lines apply the input signal of the circuitry. As a result, in implementing N colors, pixels including white do not provide a separate circuit, so N colors can be implemented with N-1 circuits. In this configuration, when a color including a white component is expressed, both of the pixels are driven and only one pixel can be driven when pure color is expressed. For example, when driving a blueish white sub-pixel when driving a blue color with a white component, only a blue sub-pixel is driven when a pure blue color is driven, and other colors are red / Green.

If the present invention is further expanded, the total number of organic light emitting diodes constituting the organic light emitting display device may be K + L. Of these, there may be constituted L organic light emitting diodes such as R, G and B, which display K colors, and auxiliary organic light emitting diodes, such as blueish white. As shown in FIG. 9, an organic light emitting diode having a pure color and an organic light emitting diode emitting light when a white color is displayed are provided to assist the pure color. The number of the actual circuit portions is K, The light emission of the light emitting diode can be controlled. In this case, the number of circuit units for controlling one organic light emitting diode in one circuit unit is a total of (KL), and the number of circuit units for controlling two organic light emitting diodes is L in total, And an aperture ratio of the organic light emitting display device is increased. The increase of the light emitting region due to the difference between the number of the circuit portions and the number of the organic light emitting diodes was confirmed in FIG. 5 to FIG.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. , Separation, substitution, and alteration of the invention will be apparent to those skilled in the art. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: display device
110: Display panel
120: Data driver
130: Gate driver
140: Timing controller
1010: first organic light emitting diode
1020: second organic light emitting diode

Claims (10)

An organic light emitting display panel in which a plurality of data lines and a plurality of gate lines are arranged and a plurality of pixels are arranged in a matrix type;
A data driver driving the data lines;
A gate driver for driving the gate lines; And
And a timing controller for controlling the data driver and the gate driver,
At least two of the plurality of pixels, the first pixel and the second pixel,
A first organic light emitting diode for emitting light of the first pixel;
And a second organic light emitting diode for emitting light of the second pixel,
Wherein the first organic light emitting diode and the second organic light emitting diode are controlled by a single circuit connected to two data lines.
The method according to claim 1,
The circuit part
A first transistor controlled by a scan signal and a signal applied to a first data line and driving the first organic light emitting diode;
And a second transistor controlled by a signal applied to the first data line and a signal applied to the second data line and driving the second organic light emitting diode,
And a gate node of the first transistor is connected to one end of the second transistor.
3. The method of claim 2,
The first transistor is a driving transistor having a first node electrically connected to a first electrode of the first organic light emitting diode, a second node corresponding to a gate node, and a third node electrically connected to a driving voltage line,
The second transistor is connected at one end to a first node of the driving transistor, the other end connected to a fifth node connected to the first electrode of the second organic light emitting diode, And a second switching transistor controlled by the first data line and the second data line.
The method of claim 3,
The circuit part
A first switching transistor controlled by the scan signal applied to the gate node and electrically connected between the second node of the driving transistor and the first data line;
A first storage capacitor electrically connected between a first node and a second node of the driving transistor;
A sensing transistor which is controlled by a sense signal applied to a gate node and is electrically connected between a first node of the driving transistor and a reference voltage line;
A second storage capacitor electrically connected between the fourth node and the fifth node of the second switching transistor; And
Further comprising a third storage capacitor electrically connected between the fifth node and the pre-low voltage line.
The method according to claim 1,
The color filter of the second organic light emitting diode
Wherein a color of the color filter of the first organic light emitting diode is a color to which white is added.
6. The method of claim 5,
The color filter of the first organic light emitting diode is blue,
And the color filter of the second organic light emitting diode is blueish white.
A driving circuit located at a point where the data line and the gate line intersect; And
And K + L organic light emitting diodes electrically connected to the driving circuit, the organic light emitting diode including a first electrode and a second electrode, and an organic layer disposed between the first electrode and the second electrode,
The K organic light emitting diodes among the organic light emitting diodes are first organic light emitting diodes whose emission is controlled by one data line and L organic light emitting diodes are second organic light emitting diodes whose emission is controlled by two data lines, The organic light emitting display device comprising:

8. The method of claim 7,
The first organic light emitting diode and the second organic light emitting diode are controlled by a single circuit unit,
The color filter of the second organic light emitting diode
Wherein a color of the color filter of the first organic light emitting diode is a color to which white is added.
8. The method of claim 7,
The color filter of the first organic light emitting diode is blue,
And the color filter of the second organic light emitting diode is blueish white.
8. The method of claim 7,
The first organic light emitting diode emits light by a signal applied to a first data line,
Wherein the second organic light emitting diode emits light by a signal applied to the first data line and the second data line.

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