KR20150061558A - Organic light emitting display device - Google Patents

Abstract

The present invention relates to an organic light emitting display device, wherein an organic light emitting diode including a transparent anode formed by one conductive transparent material and an organic light emitting diode including a cavity anode formed by a plurality of conductive materials are formed on one panel. According to the present invention, the viewing angle of the organic light emitting display device may be improved. Also, the brightness characteristics and color difference characteristics of the organic light emitting display device may be improved. Furthermore, color coordinate characteristics may be improved.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting display, and more particularly, to an organic light emitting display having a bottom emission structure.

Flat panel display devices (FPDs) are used in various types of electronic products including mobile phones, tablet PCs, and notebook computers. Examples of the flat panel display include a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting display (OLED). Recently, Electrophoretic display devices (EPD) are also widely used.

In particular, the organic light emitting diode (OLED) uses a self-luminous element that emits light by itself, and thus has advantages such as a fast response speed, a high luminous efficiency, a high luminance, and a large viewing angle.

FIG. 1 is an exemplary view for explaining an optical output method of a conventional organic light emitting display device, and shows a bottom emission organic light emitting display device in which light is output to a lower substrate.

The OLED display may be configured as a top emission type in which an organic light emitting diode is formed on a lower substrate and light emitted from the organic light emitting diode is emitted to the outside through an upper substrate. As shown in the figure, a bottom emission type in which an organic light emitting diode is formed on a lower substrate and light generated in the organic light emitting diode is emitted to a lower substrate may be formed.

As shown in FIG. 1, an organic light emitting display device configured by a bottom emission type has an anode, an organic light emitting layer, and a cathode formed on a transparent substrate, A pixel is divided by a bank, and the organic light emitting diode outputs light by a current transmitted by a driving transistor (TFT).

FIG. 2 is a schematic view illustrating a cross-sectional structure of an organic light emitting diode applied to a conventional organic light emitting display, and FIG. 3 is a graph illustrating a viewing angle characteristic of a conventional organic light emitting display.

As shown in FIG. 2A, an organic light emitting display device having a general bottom emission structure is formed of a plurality of pixels, and organic light emitting diodes 11 are formed in each of the pixels.

The organic light emitting diode 11 may be formed of an insulating film such as SiO 2, SiN x, or SiO x deposited on a substrate, or an insulating film made of indium tin oxide (ITO) An organic light emitting layer formed of an anode, a hole injection layer (HIL), a hole transport layer (HTL), an emission material layer (EML), and an electron transport layer (ETL) And a cathode (cathode).

The general organic light emitting diode constructed as described above has an excellent luminance viewing angle as shown in the graph of Non-Cavity in FIG. 3 (a) As can be seen from the graph, it has excellent color difference characteristics. However, as shown in Fig. 2 (a), a general organic light emitting diode using ITO as the anode has a problem that it is difficult to secure desired color coordinates only by changing the general light emitting material. Particularly, it is difficult to secure excellent deep blue characteristics in a general organic light emitting diode as described above.

Therefore, in the organic light emitting diode applied to another organic light emitting display device as shown in FIG. 2 (b), the anode is formed in a three-layer structure of ITO / Ag / ITO. The organic light emitting diode having a structure as shown in FIG. 2 (b) uses micro-cavities. Methods of utilizing the micro resonance are described in prior art publications such as Publication No. 10-2011-0068638 and Publication No. 10-2011-0064672.

In the conventional organic light emitting diode in which the anode is formed in a three-layer structure, due to a micro-cavity effect formed between Al used as a cathode and the anode formed in a three-layer structure, the spectrum becomes narrower, and thus, a more improved color characteristic can be secured. However, the conventional organic light emitting diode having the three-layered anode has a narrow luminance viewing angle as shown in the graph of Micro-Cavity in FIG. 3 (a) The color difference characteristics are degraded as can be seen from the graph indicated by Micro-Cavity in FIG. Therefore, in a display device using an organic light emitting diode having a three-layered anode, it is difficult to secure a viewing angle characteristic that matches the intended use of the display device.

3 (a) and 3 (b), an organic light emitting diode (indicated by Micro-Cavity) having an anode of a three-layer structure is an organic light emitting diode having an anode formed of only ITO Has a front luminance characteristic improved by about 1.8 times as compared with a light emitting diode (Non-Cavity). However, in an organic light emitting diode having a three-layer structure anode, the luminance viewing angle and chrominance characteristics are largely lowered.

In order to adjust the deterioration of the luminance viewing angle and chrominance characteristics as described above, the reflection and transmission characteristics of the anode must be adjusted by adjusting the thickness of Al constituting the cathode. However, in general, in the manufacturing process of the organic light emitting diode, the range of adjustment is limited in order to ensure the fairness. Therefore, it is not easy to adjust the thickness of Al, the reflection characteristic of the anode, and the transmission characteristics of the anode in consideration of the viewing angle characteristics.

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide an organic light emitting diode comprising an organic light emitting diode composed of a transparent anode formed of one conductive transparent material and a cavity anode formed of a plurality of conductive materials, And an organic light emitting diode (OLED) display device.

According to an aspect of the present invention, there is provided an organic light emitting diode display comprising: a panel having a plurality of pixels formed therein; And a panel driver for driving the panel, wherein each of the pixels includes a plurality of subpixels, each of the subpixels includes a first organic light emitting diode having a cavity anode formed of a plurality of conductive materials, And second organic light emitting diodes having a transparent anode formed of a conductive transparent material.

According to the present invention, the front viewing angle of the organic light emitting display device can be improved.

Further, according to the present invention, the luminance characteristic and the color difference characteristic of the organic light emitting display device can be improved.

Further, according to the present invention, desired color coordinate characteristics can be ensured.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting display.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an organic light emitting diode (OLED) display device.
3 is a graph showing an example of a viewing angle characteristic of a conventional organic light emitting display device.
4 is a view illustrating an organic light emitting display according to an embodiment of the present invention.
5 is an exemplary view showing a panel applied to the OLED display according to the first and second embodiments of the present invention;
6 is an exemplary view illustrating a driving unit formed on a panel applied to the OLED display according to the first and second embodiments of the present invention;
FIG. 7 is an exemplary view illustrating a panel applied to an OLED display according to a third embodiment of the present invention; FIG.
8 is a view illustrating a driving unit formed on a panel applied to an OLED display according to a third embodiment of the present invention.
9 is a graph illustrating the viewing angle characteristics of an organic light emitting display according to an exemplary embodiment of the present invention.
10 is an exemplary view showing a panel applied to an OLED display according to a fourth embodiment of the present invention;
FIG. 11 is another exemplary view showing a panel applied to an OLED display according to a fourth embodiment of the present invention; FIG.
FIG. 12 is a cross-sectional view of a panel applied to an OLED display according to a fourth embodiment of the present invention; FIG.
13 is a view for explaining the principle of an OLED display according to a fourth embodiment of the present invention.
FIG. 14 is a chromaticity diagram of an embodiment of a panel applied to an OLED display according to a fourth embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram of an organic light emitting display according to an embodiment of the present invention.

4, a subpixel 110 is formed for each intersection of the gate lines GL1 to GLg and the data lines DL1 to DLd, A gate driver 200 for sequentially supplying scan pulses to the gate lines GL1 to GLg formed on the panel 100, A data driver 300 for supplying a data voltage to the lines DL1 to DLd and a timing controller 400 for controlling the functions of the gate driver 200 and the data driver 300. [

First, a sub pixel (P) 110 is formed in an area where the plurality of gate lines GL and the data lines DL cross each other in the panel 100.

Each sub-pixel 110 includes an organic light emitting diode for outputting light and a driving unit for driving the organic light emitting diode.

First, the organic light emitting diode may be a top emission type in which light emitted from the organic light emitting diode is emitted to the outside through an upper substrate, (Bottom Emission) mode.

The present invention relates to a display device including an organic light emitting diode driven by a bottom emission type. An organic light emitting diode driven by the bottom emission type has an anode, an organic light emitting layer and a cathode formed on a transparent lower substrate, And the organic light emitting diode outputs light by a current transmitted by a driving transistor (TFT), and the cathode upper end is sealed by the upper substrate.

Although one organic light emitting diode may be formed in the sub pixel 110 (first and second embodiments), two organic light emitting diodes may be formed (the third embodiment).

Secondly, the driving unit may include at least two transistors and a storage capacitor connected to the data line DL and the gate line GL to control driving of the organic light emitting diode OLED. have.

The anode of the organic light emitting diode (OLED) is connected to the first power source, and the cathode is connected to the second power source. The organic light emitting diode OLED outputs light having a predetermined luminance corresponding to the current supplied from the driving transistor.

The driving unit controls the amount of current supplied to the organic light emitting diode OLED according to a data voltage supplied to the data line DL when a scan pulse is supplied to the gate line GL.

To this end, the driving transistor is connected between the first power source and the organic light emitting diode, and the switching transistor is connected between the driving transistor and the data line DL and the gate line GL.

The structure of the sub-pixel 110, the structure of the organic light emitting diode, and the structure of the driving unit will be described in detail below with reference to FIGS. 5 to 8. FIG.

Next, the timing controller 400 generates a gate control signal GCS for controlling the gate driver 200 by using a vertical synchronizing signal, a horizontal synchronizing signal and a clock supplied from an external system (not shown) And outputs a data control signal DCS for controlling the data driver 300.

The timing controller 400 samples the input image data input from the external system, rearranges the input image data, and supplies the rearranged digital image data to the data driver 300.

That is, the timing controller 400 rearranges the input image data supplied from the external system to transmit the rearranged digital image data to the data driver 300, and supplies the clock supplied from the external system, A gate control signal GCS for controlling the gate driver 200 and a data enable signal for controlling the data driver 300 and the data driver 300, respectively, using a clock signal, a vertical synchronization signal (the clock and the signals are simply referred to as a timing signal) And transmits the data control signal DCS to the gate driver 200 and the data driver 300.

In particular, in order to achieve the above-mentioned object, the timing controller 400 includes a receiver for receiving the input image data and various signals as described above from the external system, An image data processor for rearranging the image data according to the panel to generate the rearranged digital image data, a controller for controlling the gate driver 200 and the data driver 300 using signals received from the receiver A control signal generator for generating the gate control signal GCS and the data control signals DCS and the control signals generated by the control signal generator and the image data generated by the image data processor, (300) or the gate driver (200) And the like.

Next, the data driver 300 converts the image data inputted from the timing controller 400 into an analog data voltage, and supplies a data voltage of one horizontal line in each horizontal period in which the scan pulse is supplied to the gate line To the data lines. That is, the data driver 300 converts the image data into a data voltage using the gamma voltages supplied from the gamma voltage generator (not shown), and outputs the data voltage to the data lines.

That is, the data driver 300 generates a sampling signal by shifting a source start pulse (SSP) from the timing controller 400 according to a source shift clock (SSC). The data driver 300 latches the image data input according to the source shift clock SSC according to a sampling signal, changes the data to a data voltage, and outputs the source output enable (SOE) And supplies the data voltage to the data lines in units of horizontal lines in response to a signal.

For this, the data driver 300 may include a shift register unit, a latch unit, a digital-analog converter, and an output buffer.

The shift register unit outputs a sampling signal using the data control signals received from the timing controller 400.

The latch unit latches the digital image data sequentially received from the timing controller 400, and simultaneously outputs the digital image data to the digital-analog converter.

The digital-analog converter converts the image data transferred from the latch unit into a data voltage and outputs the data voltage. That is, the digital-analog converter converts the image data into the data voltage using the gamma voltage supplied from the gamma voltage generator (not shown), and outputs the data voltage to the data lines.

The output buffer outputs the data voltage transmitted from the digital-analog converter to the data lines (DL) of the panel according to a source output enable signal (SOE) transmitted from the timing controller (400) .

Lastly, the gate driver 200 sequentially supplies scan pulses to the gate lines GL1 to GLg of the panel 100 in response to the gate control signal input from the timing controller 400. [ Accordingly, the switching transistors formed in the respective subpixels of the corresponding horizontal line to which the scan pulse is input are turned on, so that an image can be output to each subpixel 110.

That is, the gate driver 200 shifts a gate start pulse (GSP) transmitted from the timing controller 400 according to a gate shift clock (GSC) On voltage to scan lines GL1 to GLg. The gate driver 200 supplies a gate-off voltage to the gate lines GL1 to GLn during the remaining period during which the scan pulse is not supplied.

The gate driver 200 may be formed independently from the panel 100 and may be electrically connected to the panel 100 in various ways, (Gate In Panel: GIP) method. In this case, the gate control signal for controlling the gate driver 200 may be a start signal VST and a gate clock GCLK.

Although the data driver 300, the gate driver 200 and the timing controller 400 are independently configured in the above description, the data driver 300 or the gate driver 200 Either one of them may be integrally formed in the timing controller 400. Hereinafter, the gate driver 200, the data driver 300, and the timing controller 400 are collectively referred to as a panel driver.

FIG. 5 is a view illustrating a panel applied to the organic light emitting diode display according to the first and second embodiments of the present invention. FIG. 5 (a) is a cross-sectional view of the organic light emitting diode display according to the first embodiment of the present invention (B) is an exemplary view showing a panel applied to the organic light emitting diode display according to the second embodiment of the present invention, and (c) shows a first embodiment of the present invention and a second embodiment Sectional view of a first organic light emitting diode 111a having a cavity anode 118a applied to an organic light emitting display according to an example of the present invention. Sectional view of a first organic light emitting diode 111b having a transparent anode 118b applied to an organic light emitting display according to an embodiment of the present invention. 6 is an exemplary view illustrating a driving unit formed on a panel applied to the OLED display according to the first and second embodiments of the present invention. FIG. 7 is a view illustrating a panel applied to an organic light emitting display according to a third embodiment of the present invention. FIG. 8 is a plan view of a panel applied to an organic light emitting display according to a third embodiment of the present invention. Fig.

First, an OLED display according to a first embodiment of the present invention will be described as follows.

4 and 5 (a), the organic light emitting display according to the first embodiment of the present invention has a cavity anode 118a formed of a plurality of conductive materials in the nth horizontal line Pixels 110 formed of a first organic light emitting diode 111a and a second organic light emitting diode (OLED) having a transparent anode 118b formed of one conductive transparent material on the (n + 1) Pixels 100 and a panel driver 200, 300, and 400 for driving the panel 100. The first and second sub-pixels 110 and 111b are formed on the first and second sub-pixels 110 and 111, respectively. Since the panel driving units 200, 300, and 400 have been described above, the structure and function of the panel 100 will be described in detail.

First, in the panel 100, as shown in FIG. 5A, a plurality of sub-pixels are formed along the horizontal line. The subpixels include a red subpixel R, a green subpixel G, and a blue subpixel B. The red subpixel R, the green subpixel G and the blue subpixel B together form one unit pixel 120. The unit pixel may output white light.

The red subpixel R, the green subpixel G, and the blue subpixel B are sequentially repeated in one horizontal line.

Next, in the n-th horizontal line among the horizontal lines constituting the panel 100, a first sub-pixel (first sub-pixel) 111a composed of a first organic light emitting diode 111a having a cavity anode 118a formed of a plurality of conductive materials Pixels 110 are formed on the (n + 1) -th horizontal line, and the second sub-pixels 110 are formed of a second organic light emitting diode 111b having a transparent anode 118b formed of one conductive transparent material .

For example, when n is an odd number, that is, in FIG. 5 (a), odd-numbered horizontal lines are provided with a first sub-pixel composed of the first organic light emitting diode 111a having the cavity anode 118a Pixels 110 are formed. More specifically, in the first horizontal line and the third horizontal lines in FIG. 5A, a first sub-pixel 110 (first sub-pixel) composed of a first organic light emitting diode 111a having the cavity anode 118a Are formed.

In the above example, the second sub-pixels 110 are formed in the even-numbered horizontal lines, the second sub-pixels 110 being composed of the second organic light emitting diode 111b having the transparent anode 118b. More specifically, in a second horizontal line and a third horizontal line in FIG. 5 (a), a second sub-pixel 110 (a second organic light emitting diode) composed of a second organic light emitting diode 111b constituting the transparent anode 118 Are formed.

That is, in the panel applied to the OLED display according to the first embodiment of the present invention, the first sub-pixels composed of the first organic light emitting diode 111a and the second organic light emitting diode 111b are repeatedly formed.

5A, only the first sub-pixels and the second sub-pixels constituted by red (R) are shown, but the first sub-pixels composed of green (G) and the second sub- Subpixels are also formed for each horizontal line, and are formed for each horizontal line by the first subpixels constituted by blue (B) and by the second subpixels.

5 (c), the first organic light emitting diode 111a having the cavity anode 118a includes a lower transparent substrate Glass, a plurality of The cavity 118a formed of a plurality of the conductive materials, the organic light emitting portion 119 stacked on the cavity anode 118a, and the organic light emitting portion 119 laminated to the organic light emitting portion 119, And a cathode (cathode).

The lower transparent substrate may be formed of a transparent glass substrate, or a transparent synthetic resin substrate, a transparent synthetic resin film, or the like.

The plurality of insulating films (SiO 2, SiN x, and SiO x) function to insulate various electrodes formed on the driving unit 112.

6, a driving transistor TR1, a driving transistor TR2 and a capacitor Cst are formed on the driving unit 112. The plurality of insulating films are formed on the gate of the transistors, And functions to insulate the source and the drain.

The plurality of insulating films may be formed of various materials in addition to the materials described above. In FIG. 5C, the plurality of insulating films are shown as three layers, but the number of the insulating films may be variously formed.

The cavity 118a is formed of two conductive transparent materials and a transparent metal thin film interposed between the two conductive transparent materials.

For example, each of the two conductive transparent materials may be indium tin oxide (ITO) (hereinafter, simply referred to as 'ITO'), and the transparent metal thin film may be formed of an aluminum thin film . The transparent metal thin film is formed of aluminum, but when the aluminum is formed to a thickness of 20 nm or less, it has a transmittance of 50% to 70%. Therefore, the transparent metal thin film is formed as a thin layer so as to have a light transmittance between 50% and 70%.

The organic light emitting portion 119 may include a hole transport layer (HTL), an emission material layer (EML), and an electron transport layer (ETL).

A hole injection layer (HIL) may be formed between the cavity anode 118a and the hole transport layer (HTL) to improve the luminous efficiency of the organic emission layer 119, An electron injection layer (EIL) may be formed between the electron transport layer (ETL) and the electron transport layer (ETL).

The cathode acts as a reflector so that the light generated by the organic light emitting unit 119 can be output to the outside through the cavity anode 118a. In this case, the cathode may be formed of a metal such as aluminum (Al), tantalum (Ta), silver (Ag), or the like.

An upper substrate (not shown) for sealing the cavity 118a may be attached to the upper end of the cavity 118a.

The first organic light emitting diode 111a is formed as a bottom emission type in which light is output to the outside through the cavity anode 118a.

When positive and negative voltages are applied to the cavity anode 118a and the cathode, respectively, in the first organic light emitting diode 111a, the positive holes of the cavity anode 118a and the positive Electrons of the cathode are transported to the light emitting material film (EML), and an exciton is generated. When the exciton transitions from the excited state to the ground state, light is generated, and the light is emitted in the form of visible light through the light emitting material film (EML).

Micro Cavity phenomenon occurs between the cavity 118a formed of the three conductive materials and the cathode.

The Micro Cavity phenomenon is a phenomenon in which light reflected by a mirror and a mirror are canceled or interfered with each other, so that only light of a certain wavelength is maintained and the rest of the wavelength is canceled to weaken the intensity of light it means. The specific wavelength can be increased by the micro resonance phenomenon.

That is, the first organic light emitting diode 111a may increase the luminous efficiency by using the fine resonance.

5 (d), the second organic light emitting diode 111b having the transparent anode 118b includes a lower transparent substrate Glass, a plurality of The transparent anode 118b formed of one conductive transparent material, the organic light emitting portion 119 stacked on the transparent anode 118b and the organic light emitting portion 119 are stacked on the organic light emitting portion 119, And a cathode (cathode).

The lower transparent substrate may be formed of a transparent glass substrate, or a transparent synthetic resin substrate, a transparent synthetic resin film, or the like.

The plurality of insulating films (SiO 2, SiN x, and SiO x) function to insulate various electrodes formed on the driving unit 112, as described above.

6, a driving transistor TR1, a driving transistor TR2 and a capacitor Cst are formed on the driving unit 112. The plurality of insulating films are formed on the gate of the transistors, And functions to insulate the source and the drain.

The plurality of insulating films may be formed of various materials in addition to the materials described above. In FIG. 5 (d), the plurality of insulating films are shown as three layers, but the number of the insulating films may be variously formed.

The transparent anode 118b is formed of one of the conductive transparent materials. For example, the transparent anode 118b may be formed of indium tin oxide (ITO).

Since the transparent anode 118b is formed of a transparent electrode such as indium tin oxide (ITO), the light emitted from the organic light emitting portion 119 can be transmitted toward the lower substrate.

The organic light emitting portion 119 may include a hole transport layer (HTL), an emission material layer (EML), and an electron transport layer (ETL).

A hole injection layer (HIL) may be formed between the transparent anode 118b and the hole transport layer (HTL) to improve the luminous efficiency of the organic emission layer 119, An electron injection layer (EIL) may be formed between the electron transport layer (ETL) and the electron transport layer (ETL).

The cathode functions as a reflector so that the light generated by the organic light emitting unit 119 can be output to the outside through the transparent anode 118b. In this case, the cathode may be formed of a metal such as aluminum (Al), tantalum (Ta), silver (Ag), or the like.

An upper substrate (not shown) for sealing the second organic light emitting diode 111b may be attached to the upper end of the cathode.

The second organic light emitting diode 111b is formed as a bottom emission type in which light is output to the outside through the transparent anode 118b.

When positive and negative voltages are applied to the transparent anode 118b and cathode, respectively, in the second organic light emitting diode 111b, the positive holes of the transparent anode 118b and the positive Electrons of the cathode are transported to the light emitting material film (EML), and excitons are generated. When the exciton transitions from the excited state to the ground state, light is generated, and the light is emitted in the form of visible light through the light emitting material film (EML).

The micro resonance phenomenon does not occur between the transparent anode 118b and the cathode.

6, the first organic light emitting diode 111a or the second organic light emitting diode 111b may be connected to the respective subpixels 110 formed in the panel 100, The driving unit 112 is formed.

The driving unit 112 includes a driving transistor connected between the high potential voltage VDD and the low potential voltage VSS to drive the first organic light emitting diode 111a or the second organic light emitting diode 111b A switching transistor TR1 connected between the driving transistor TR2 and the data line DL and turned on by the scan pulse supplied through the gate line GL, And a capacitor Cst connected to the node between the driving transistor TR2 and the driving transistor TR2 and the first organic light emitting diode 111a or the second organic light emitting diode 111b.

The driving unit 112 may further include a plurality of transistors for compensating deterioration of the first organic light emitting diode 111a or the second organic light emitting diode 111b or for sensing deterioration information.

The detailed configuration and function of the driving unit 112 are the same as the detailed configuration and functions of the driving unit formed in the pixels of the currently used organic light emitting display device, and a detailed description thereof will be omitted.

The first subpixel 110 includes the first organic light emitting diode 111a and the driving unit 112 and the second subpixel 110 includes the second organic light emitting diode 111b, And the driving unit 112.

5, since the first organic light emitting diode 111a or the second organic light emitting diode 111b is driven in the bottom emission mode, the driving unit 112 is driven by the first sub- Pixel or the second sub-pixel, the first organic light emitting diode 111a or the second organic light emitting diode 111b.

Second, an OLED display according to a second embodiment of the present invention will now be described.

The organic light emitting display according to the second embodiment of the present invention includes a first organic light emitting diode (OLED) having a cavity anode 118a formed of a plurality of conductive materials, as shown in FIGS. 4 and 5B Pixels 110 composed of a first organic light emitting diode 111b having first organic light emitting diodes 111a and a second organic light emitting diode 111b having a transparent anode 118b formed of one conductive transparent material, And a panel driving unit 200, 300, 400 for driving the panel 100. The panel driving unit 200, Since the panel driving units 200, 300, and 400 have been described above, the structure and function of the panel 100 will be described in detail. In the description of the panel 100, the same or similar contents as those described in the first embodiment are omitted or briefly described.

First, in the panel 100, as shown in FIG. 5B, a plurality of sub-pixels are formed along the horizontal line. The subpixels include a red subpixel R, a green subpixel G, and a blue subpixel B. The red subpixel R, the green subpixel G and the blue subpixel B together form one unit pixel 120.

The red subpixel R, the green subpixel G, and the blue subpixel B are sequentially repeated in one horizontal line.

Next, in each of the horizontal lines constituting the panel 100, first sub pixels 110 composed of a first organic light emitting diode 111a having a cavity anode 118a formed of a plurality of conductive materials, The second subpixels 110 are formed of the second organic light emitting diode 111b having the transparent anode 118b formed of one conductive transparent material.

For example, in FIG. 5B, the red sub-pixel R of the first unit pixel 120 formed on the left side of the first horizontal line includes the first organic light emitting diode 111a And the red subpixel R of the second unit pixel 120 is the second subpixel including the second organic light emitting diode 111b.

In other words, in the panel applied to the organic light emitting display according to the second embodiment of the present invention, the first sub-pixels composed of the first organic light emitting diode 111a and the second organic light emitting And the second sub-pixels composed of the diode 111b are repeatedly formed.

5B, only the first sub-pixels and the second sub-pixels constituted by red (R) are shown, but the first sub-pixels composed of green (G) and the second sub- The subpixels are all formed on one horizontal line, and the first subpixels composed of blue (B) and the second subpixels are all formed on one horizontal line.

In this case, all of the red subpixel R, the green subpixel G, and the blue subpixel B constituting one unit pixel 120 may be composed of the first subpixels have. The red subpixel R, the green subpixel G, and the blue subpixel B constituting another unit pixel 120 adjacent to the unit pixel constituted by the first subpixels, All of which may be composed of the second sub-pixels.

However, one unit pixel 120 may include both the first subpixel and the second subpixel. For example, in one unit pixel 120, the red subpixel may be composed of the first subpixel composed of the first organic light emitting diode 111a, and the green subpixel and the blue subpixel , And the second organic light emitting diode 111b.

5 (c), the first organic light emitting diode 111a having the cavity anode 118a includes a lower transparent substrate Glass, a plurality of The cavity 118a formed of a plurality of the conductive materials, the organic light emitting portion 119 stacked on the cavity anode 118a, and the organic light emitting portion 119 laminated to the organic light emitting portion 119, And a cathode (cathode).

The lower transparent substrate may be formed of a transparent glass substrate, or a transparent synthetic resin substrate, a transparent synthetic resin film, or the like.

The plurality of insulating films (SiO 2, SiN x, and SiO x) function to insulate various electrodes formed on the driving unit 112.

The cavity 118a is formed of two conductive transparent materials and a transparent metal thin film interposed between the two conductive transparent materials. For example, each of the two conductive transparent materials may be indium tin oxide (ITO) (hereinafter, simply referred to as 'ITO'), and the transparent metal thin film may be formed of an aluminum thin film . The transparent metal thin film is formed of aluminum, but when the aluminum is formed to a thickness of 20 nm or less, it has a transmittance of 50% to 70%. Therefore, the transparent metal thin film is formed as a thin layer so as to have a light transmittance between 50% and 70%.

The organic light emitting portion 119 may include a hole transport layer (HTL), an emission material layer (EML), and an electron transport layer (ETL). A hole injection layer (HIL) may be formed between the cavity anode 118a and the hole transport layer (HTL) to improve the luminous efficiency of the organic emission layer 119, An electron injection layer (EIL) may be formed between the electron transport layer (ETL) and the electron transport layer (ETL).

The cathode acts as a reflector so that the light generated by the organic light emitting unit 119 can be output to the outside through the cavity anode 118a. In this case, the cathode may be formed of a metal such as aluminum (Al), tantalum (Ta), silver (Ag), or the like. An upper substrate (not shown) for sealing the first organic light emitting diode 111a may be attached to the upper end of the cathode.

The first organic light emitting diode 111a is formed as a bottom emission type in which light is output to the outside through the cavity anode 118a. When positive and negative voltages are applied to the cavity anode 118a and the cathode, respectively, in the first organic light emitting diode 111a, the positive holes of the cavity anode 118a and the positive Electrons of the cathode are transported to the light emitting material film (EML), and an exciton is generated. When the exciton transitions from the excited state to the ground state, light is generated, and the light is emitted in the form of visible light through the light emitting material film (EML).

Micro Cavity phenomenon occurs between the cavity 118a formed of the three conductive materials and the cathode. The Micro Cavity phenomenon is a phenomenon in which light reflected by a mirror and a mirror are canceled or interfered with each other, so that only light of a certain wavelength is maintained and the rest of the wavelength is canceled to weaken the intensity of light it means. The specific wavelength can be increased by the micro resonance phenomenon. That is, the first organic light emitting diode 111a may increase the luminous efficiency by using the fine resonance.

5 (d), the second organic light emitting diode 111b having the transparent anode 118b includes a lower transparent substrate Glass, a plurality of The transparent anode 118b formed of one conductive transparent material, the organic light emitting portion 119 stacked on the transparent anode 118b and the organic light emitting portion 119 are stacked on the organic light emitting portion 119, And a cathode (cathode).

The lower transparent substrate may be formed of a transparent glass substrate, or a transparent synthetic resin substrate, a transparent synthetic resin film, or the like.

The plurality of insulating films (SiO 2, SiN x, and SiO x) function to insulate various electrodes formed on the driving unit 112, as described above.

The transparent anode 118b is formed of one of the conductive transparent materials. For example, the transparent anode 118b may be formed of indium tin oxide (ITO).

The organic light emitting portion 119 may include a hole transport layer (HTL), an emission material layer (EML), and an electron transport layer (ETL). A hole injection layer (HIL) may be formed between the transparent anode 118b and the hole transport layer (HTL) to improve the luminous efficiency of the organic emission layer 119, An electron injection layer (EIL) may be formed between the electron transport layer (ETL) and the electron transport layer (ETL).

The cathode functions as a reflector so that the light generated by the organic light emitting unit 119 can be output to the outside through the transparent anode 118b. In this case, the cathode may be formed of a metal such as aluminum (Al), tantalum (Ta), silver (Ag), or the like. An upper substrate (not shown) for sealing the second organic light emitting diode 111b may be attached to the upper end of the cathode.

The second organic light emitting diode 111b is formed as a bottom emission type in which light is output to the outside through the transparent anode 118b. The micro resonance phenomenon does not occur between the transparent anode 118b and the cathode.

6, the first organic light emitting diode 111a or the second organic light emitting diode 111b is caused to emit light to each subpixel 110 formed on the panel 100 The driving unit 112 is formed.

The driving unit 112 includes a driving transistor connected between the high potential voltage VDD and the low potential voltage VSS to drive the first organic light emitting diode 111a or the second organic light emitting diode 111b A switching transistor TR1 connected between the driving transistor TR2 and the data line DL and turned on by the scan pulse supplied through the gate line GL, And a capacitor Cst connected to the node between the driving transistor TR2 and the driving transistor TR2 and the first organic light emitting diode 111a or the second organic light emitting diode 111b.

The detailed configuration and function of the driving unit 112 are the same as the detailed configuration and function of driving formed in pixels of an organic light emitting display device currently in use, and a detailed description thereof will be omitted.

The first subpixel 110 includes the first organic light emitting diode 111a and the driving unit 112 and the second subpixel 110 includes the second organic light emitting diode 111b, And the driving unit 112. 5, since the first organic light emitting diode 111a or the second organic light emitting diode 111b is driven in the bottom emission mode, the driving unit 112 is driven by the first sub- Pixel or the second sub-pixel, the first organic light emitting diode 111a or the second organic light emitting diode 111b.

Third, an OLED display according to a third embodiment of the present invention will now be described.

4 and 7, the organic light emitting display according to the third embodiment of the present invention includes a panel 100 having a plurality of unit pixels 120 formed thereon, Panel drivers 200, 300, and 400, and each of the unit pixels 120 includes a plurality of sub-pixels 110.

Each of the sub pixels 110 includes a first organic light emitting diode 111a having the cavity anode 118a formed of a plurality of conductive materials and a transparent anode 118b formed of one conductive transparent material. And a second organic light emitting diode 111b. Since the panel driving units 200, 300, and 400 have been described above, the structure and function of the panel 100 will be described in detail. Further, among the descriptions of the panel 100, the same or similar contents as those described in the first and second embodiments are omitted or briefly described.

First, in the panel 100, a plurality of sub-pixels are formed along the horizontal line. The subpixels include a red subpixel R, a green subpixel G, and a blue subpixel B. The red subpixel R, the green subpixel G, and the blue subpixel B form one pixel 120. Although only one unit pixel 120 is shown in FIG. 7, a plurality of unit pixels 120 are formed along a horizontal line of the panel 100, and a plurality of unit pixels 120 are arranged along a vertical line of the panel 100 Respectively.

The red subpixel R, the green subpixel G, and the blue subpixel B are sequentially repeated in one horizontal line.

Next, in each of the sub-pixels 110 constituting the panel 100, the first organic light emitting diode 111a having the cavity anode 118a formed of a plurality of conductive materials and the first organic light emitting diode 111a having one conductive transparent material The second organic light emitting diode 111b having the transparent anode 118b formed of the second organic light emitting diode 111b is formed.

In the first and second embodiments of the present invention, the first organic light emitting diode 111a and the second organic light emitting diode 111b are formed in different sub-pixels 110.

However, in the third embodiment of the present invention, the first organic light emitting diode 111a and the second organic light emitting diode 111b are formed in one subpixel 110.

For example, a red subpixel R, a green subpixel G and a blue subpixel B are formed in one unit pixel 120 shown in FIG. 7, and the red subpixels R, The first organic light emitting diode 111a and the second organic light emitting diode 111b are formed in the green subpixel G and the blue subpixel B, respectively.

The area of the first organic light emitting diode 111a and the area of the second organic light emitting diode 111b formed in one sub pixel 110 may be the same or different from each other.

Next, as shown in FIG. 5C, the first organic light emitting diode 111a having the cavity anode 118a formed in one of the sub-pixels 110 includes a lower transparent substrate Glass ), A plurality of insulating films (SiO2, SiNx, SiOx) stacked on the transparent substrate, the cavity anode 118a formed of a plurality of conductive materials, and the organic light emitting unit 118a stacked on the cavity anode 118a. (119) and a cathode (Cathode) stacked on the organic light emitting portion (119).

The lower transparent substrate may be formed of a transparent glass substrate, or a transparent synthetic resin substrate, a transparent synthetic resin film, or the like.

The plurality of insulating films (SiO 2, SiN x, and SiO x) function to insulate various electrodes formed on the driving unit 112.

The cavity 118a is formed of two conductive transparent materials and a transparent metal thin film interposed between the two conductive transparent materials. For example, each of the two conductive transparent materials may be indium tin oxide (ITO) (hereinafter, simply referred to as 'ITO'), and the transparent metal thin film may be formed of an aluminum thin film . The transparent metal thin film is formed of aluminum, but when the aluminum is formed to a thickness of 20 nm or less, it has a transmittance of 50% to 70%. Therefore, the transparent metal thin film is formed as a thin layer so as to have a light transmittance between 50% and 70%.

The organic light emitting portion 119 may include a hole transport layer (HTL), an emission material layer (EML), and an electron transport layer (ETL). A hole injection layer (HIL) may be formed between the cavity anode 118a and the hole transport layer (HTL) to improve the luminous efficiency of the organic emission layer 119, An electron injection layer (EIL) may be formed between the electron transport layer (ETL) and the electron transport layer (ETL).

The cathode acts as a reflector so that the light generated by the organic light emitting unit 119 can be output to the outside through the cavity anode 118a. In this case, the cathode may be formed of a metal such as aluminum (Al), tantalum (Ta), silver (Ag), or the like. An upper substrate (not shown) for sealing the cavity 118a may be attached to the upper end of the cavity 118a.

The first organic light emitting diode 111a is formed as a bottom emission type in which light is output to the outside through the cavity anode 118a. When positive and negative voltages are applied to the cavity anode 118a and the cathode, respectively, in the first organic light emitting diode 111a, the positive holes of the cavity anode 118a and the positive Electrons of the cathode are transported to the light emitting material film (EML), and an exciton is generated. When the exciton transitions from the excited state to the ground state, light is generated, and the light is emitted in the form of visible light through the light emitting material film (EML).

Micro Cavity phenomenon occurs between the cavity 118a formed of the three conductive materials and the cathode. The Micro Cavity phenomenon is a phenomenon in which light reflected by a mirror and a mirror are canceled or interfered with each other, so that only light of a certain wavelength is maintained and the rest of the wavelength is canceled to weaken the intensity of light it means. The specific wavelength can be increased by the micro resonance phenomenon. That is, the first organic light emitting diode 111a may increase the luminous efficiency by using the fine resonance.

5 (d), the second organic light emitting diode 111b having the transparent anode 118b includes a lower transparent substrate Glass, a plurality of The transparent anode 118b formed of one conductive transparent material, the organic light emitting portion 119 stacked on the transparent anode 118b and the organic light emitting portion 119 are stacked on the organic light emitting portion 119, And a cathode (cathode).

8, the first organic light emitting diode 111a and the second organic light emitting diode 111b are made to emit light to the respective subpixels 110 formed on the panel 100, The driving unit 112 is formed.

The driving unit 112 includes a driving transistor connected between the high potential voltage VDD and the low potential voltage VSS to drive the first organic light emitting diode 111a and the second organic light emitting diode 111b A switching transistor TR1 connected between the driving transistor TR2 and the data line DL and turned on by the scan pulse supplied through the gate line GL, And a capacitor Cst connected to the node between the driving transistor TR2 and the driving transistor TR2 and the first organic light emitting diode 111a or the second organic light emitting diode 111b.

The driving unit 112 may further include a plurality of transistors for compensating deterioration of the first organic light emitting diode 111a or the second organic light emitting diode 111b or for sensing deterioration information.

The first organic light emitting diode 111a and the second organic light emitting diode 111b are connected between a high potential voltage line to which the high potential voltage VDD is supplied and a low potential potential line to which the low potential potential VSS is supplied ) Are connected. The first organic light emitting diode 111a and the second organic light emitting diode 111b are simultaneously lighted by the driving transistor TR2 and turned off at the same time.

For example, the first organic light emitting diode 111a and the second organic light emitting diode 111b are connected between the high potential voltage line and the low potential voltage line, and the first organic light emitting diode 111a And the driving transistor TR2 is connected between the second organic light emitting diode 111b and the high potential voltage line and the cavity anode 118a of the first organic light emitting diode 111a, The transparent anode 118b of the second organic light emitting diode 111b is connected to the driving transistor TR2 and is connected to the cathode of the first organic light emitting diode 111a, And the cathodes of the transistor 111b are connected to the low potential voltage line. In this case, when the driving transistor TR2 is turned on and a current flows from the high potential voltage line to the low potential voltage line, the first organic light emitting diode 111a and the second organic light emitting diode 111b emit light Can be output.

The first organic light emitting diode 111a and the second organic light emitting diode 111b are simultaneously driven by one driving unit 112 formed in the sub pixel 110. [ For this, the cavity anode 118a and the transparent anode 118b are commonly connected to one driver 120 formed in the sub-pixel 110. [

8, since the first organic light emitting diode 111a and the second organic light emitting diode 111b are driven in the bottom emission mode, 110 are formed in parallel with the first organic light emitting diode 111a and the second organic light emitting diode 111b.

9 is a graph showing an example of a viewing angle characteristic of the organic light emitting diode display according to the present invention.

The first organic light emitting diode 111a having the cavity anode 118a and the second organic light emitting diode 111b having the transparent anode 118b are formed in the panel 100 applied to the organic light emitting diode display according to the present invention, (111b) are all formed.

9, the graph showing the viewing angle characteristics of the OLED display according to the present invention shows a Hybrid Concept, and a graph showing viewing angle characteristics of a conventional OLED display as described with reference to FIG. 3 Non-Cavity is indicated, and Micro-Cavity is shown in a graph showing viewing angle characteristics of a conventional organic light emitting display device using micro resonance.

In the organic light emitting display according to the present invention, as shown in FIG. 9A, the luminance characteristic is excellent at all viewing angles, and as shown in FIG. 9B, have.

The present invention described above is briefly summarized as follows.

The organic light emitting diodes of the same color which are spatially separated from each other have different structures, that is, a structure capable of generating micro cavities and a structure having no micro resonance, The luminance characteristic and the chrominance characteristic can be improved and the adjustment of the luminance characteristic and the chrominance characteristic can be easily performed.

To this end, in the first embodiment of the present invention, only the first organic light emitting diodes having the cavity anode 118b are formed on the nth horizontal line, and the organic light emitting diodes having the transparent anode 118b on the (n + 1) 2 organic light emitting diodes are formed.

In addition, in the second embodiment of the present invention, the first organic light emitting diodes and the second organic light emitting diodes are formed on one horizontal line.

In addition, in the third embodiment of the present invention, the first organic light emitting diode and the second organic light emitting diode are all formed in one subpixel.

That is, the cavity anode 118a formed in the first organic light emitting diode may have a shape of ITO / Ag / ITO to induce a fine resonance, and the transparent anode 118b formed in the second organic light emitting diode ) Is composed of only ITO like an anode formed in a general organic light emitting diode and does not induce a fine resonance.

FIG. 10 is a view illustrating a panel applied to an OLED display according to a fourth embodiment of the present invention, FIG. 11 is a cross-sectional view illustrating a panel applied to the OLED display according to the fourth embodiment of the present invention, Fig. FIG. 12 is a cross-sectional view taken along the line A-A 'of FIG. 10, illustrating a panel to be applied to an OLED display according to a fourth embodiment of the present invention. The same or similar contents as those described above are omitted or briefly described.

In the third embodiment of the present invention described above, each of the subpixels 110 includes the first organic light emitting diode 111a having the cavity anode 118a formed of a plurality of conductive materials, And the second organic light emitting diode 111b having a transparent anode 118b formed of a material.

A fourth embodiment of the present invention is proposed to improve color characteristics and image quality of red subpixels, green subpixels, and blue subpixels using the third embodiment of the present invention.

4, 10 and 11, the organic light emitting display according to the fourth embodiment of the present invention includes a panel 100 having a plurality of unit pixels 120 formed thereon, 300, and 400, each of which drives a plurality of sub-pixels 110. Each of the unit pixels 120 includes a plurality of sub-pixels 110.

Each of the subpixels 110 applied to the fourth embodiment of the present invention may include only the second organic light emitting diode 111b and may include only the first organic light emitting diode 111a and the second organic light emitting diode 111b, (111b), and may include only the first organic light emitting diode (111a).

A subpixel composed of only the first organic light emitting diode is referred to as a first subpixel. The first sub-pixel is also referred to as an all-cavity sub-pixel.

And the subpixel composed only of the second organic light emitting diode is referred to as a second subpixel. The second sub-pixel is also referred to as a non-cavity sub-pixel.

A subpixel composed of the first organic light emitting diode and the second organic light emitting diode is referred to as a third subpixel. The third sub-pixel is also referred to as a hybrid-cavity sub-pixel. In the unit pixel 120 shown in FIG. 10, the green subpixel G is the third subpixel. Therefore, the green subpixel G shown in FIG. 10 is formed of a plurality of conductive materials, as shown in FIG. 12, which shows a cross section of the green subpixel G. The green subpixel G has the cavity anode 118a formed of a plurality of conductive materials. And the second organic light emitting diode 111b having a first organic light emitting diode 111a and a transparent anode 118b formed of one conductive transparent material.

In the fourth embodiment of the present invention, the unit pixel 120 is formed by a combination of the first subpixel, the second subpixel, and the third subpixel.

10, the unit pixel 120 applied to the fourth embodiment of the present invention includes a red subpixel R, a green subpixel G, and a blue subpixel B, Wherein the red subpixel R is the third subpixel and the green subpixel G is the third subpixel and the blue subpixel B is the first subpixel have.

11, the unit pixel 120 applied to the fourth embodiment of the present invention includes a red subpixel R, a green subpixel G, and a blue subpixel B ), The red subpixel (R) is the second subpixel, the green subpixel (G) is the third subpixel, and the blue subpixel (B) is the first subpixel .

In addition to the above two embodiments, the unit pixel 120 applied to the fourth embodiment of the present invention may be formed by various combinations of the first subpixel, the second subpixel, and the third subpixel .

In the fourth embodiment of the present invention, as described in the third embodiment of the present invention, the first organic light emitting diode and the second organic light emitting diode constituting the third subpixel are common to one driver And can be driven at the same time.

FIG. 13 is a color coordinate system for explaining the principle of the organic light emitting diode display according to the fourth embodiment of the present invention. FIG. 14 is a diagram illustrating a color coordinate system of a panel applied to the OLED display according to the fourth embodiment of the present invention. One example is a color coordinate system.

The fourth embodiment of the present invention optimizes the cavity structure for the red subpixels, the green subpixels, and the blue subpixels constituting the unit pixel 120 so that the red subpixels, the green subpixels, It is possible to improve the color characteristics of the respective colors. Thus, the image quality of the display device can be improved. The structure of the cavity anode 118a formed of a plurality of conductive materials is referred to as a cavity structure.

In the fourth embodiment of the present invention, each of the red subpixel, the green subpixel, and the blue subpixel constituting the unit pixel 120 is formed of the first subpixel, the second subpixel, It can be either.

For example, the color purity and luminance efficiency of the cavity subpixel (first subpixel) are increased, but the viewing angle and chrominance characteristics are not improved. Therefore, in the case where the cavity structure is applied, the subpixels having a small change in the color coordinate and a large change in the viewing angle and color difference characteristics are formed in the hybrid cavity subpixel (third subpixel) or the non-cavity subpixel As shown in FIG. Thus, changes in viewing angle and color difference characteristics can be alleviated.

In addition, even if the hybrid cavity subpixel is formed, the subpixel in which desired color coordinate characteristics are difficult to obtain can be the all cavity subpixel. In the all-cavity subpixel (first subpixel), desired color coordinate characteristics can be ensured.

As described above, in the fourth embodiment of the present invention, a structure capable of achieving optimal color characteristics is selected based on device characteristics of the red organic light emitting diode, the green organic light emitting diode, and the blue organic light emitting diodes. Accordingly, the red subpixel, the green subpixel, and the blue subpixel constituting one unit pixel may be formed in different structures.

According to the fourth embodiment of the present invention, the color coordinate characteristics, the viewing angle characteristics, and the color difference characteristics of each of the red subpixels, the green subpixels, and the blue subpixels can be optimized, have.

To be more specific, in the third embodiment of the present invention, all the subpixels constituting the unit pixel are composed of the third subpixel, that is, the hybrid cavity subpixel. However, in the fourth embodiment of the present invention, subpixels constituting a unit pixel are formed in different structures.

According to the fourth embodiment of the present invention, the color characteristics, for example, the color coordinates, the viewing angle, and the chrominance can be all satisfied with the specifications required in the display apparatus.

For example, any one of the red organic light emitting diode, the green organic light emitting diode, and the blue organic light emitting diode may have a color coordinate property which is basically not very good and any one of the above- The desired color coordinates may not be satisfied even if the pixel is formed. Such an element may be formed of the non-cavity sub-pixel, or may be formed of the all-cavity sub-pixel.

In addition, any one of the red organic light emitting diode, the green organic light emitting diode, and the blue organic light emitting diode may have a very bad viewing angle characteristic and chrominance characteristic when formed of the all cavity subpixel. In this case, even if any one of the devices is formed of the hybrid cavity sub-pixel, the reagent angle characteristics and chrominance characteristics may not satisfy a desired target value. Such an element may be formed of the non-cavity sub-pixel.

That is, in the fourth embodiment of the present invention, considering the color coordinate characteristics, the viewing angle characteristics, and the color difference characteristics of each of the red organic light emitting diode, the green organic light emitting diode, and the blue organic light emitting diodes, .

The contents described above will be described in more detail as follows.

First, in the case of the red organic light emitting diode, when the cavity structure is applied, the change of the color coordinate is small, and the change of the viewing angle characteristic and the color difference characteristic is large. Accordingly, the red subpixel including the red organic light emitting diode may be formed of the hybrid cavity subpixel (third subpixel) or the non-cavity subpixel (second subpixel). Thus, changes in viewing angle characteristics and color difference characteristics can be mitigated.

Secondly, when the green subpixel including the green organic light emitting diode is the hybrid cavity subpixel, desired color coordinate characteristics can be ensured, and viewing angle characteristics and chrominance characteristics can be alleviated.

Thirdly, even if the blue subpixel including the blue organic light emitting diode becomes the hybrid cavity subpixel, it is difficult to obtain the desired color coordinate property. Thus, the blue subpixel can be formed of the all-cavity subpixel, and thus the desired color coordinate property can be ensured.

In the following, the optimal structure of the red subpixel, the green subpixel, and the blue subpixel is determined based on the color coordinate characteristics with reference to Table 1 and Figs. 13 and 14.

13 shows the color coordinate system. In FIG. 13, the areas indicated by R, G, and B indicate the color coordinates (BT709 standard) required for the display device. For example, the display device should be able to display the colors included in the area indicated by R, G, B in Fig.

Next, in Fig. 13, the area indicated by R1, G1, and B1 represents the color coordinates in the case where all red subpixels, green subpixels, and blue subpixels are the non-cavity subpixels. Compared with the areas indicated by R, G and B, it can be seen that the areas indicated by R1, G1 and B1 are disadvantageous to the blue representation. In other words, the areas indicated by R1, G1, and B1 do not include a part of blue among the areas indicated by R, G, and B.

Next, in FIG. 13, the area indicated by R2, G2, and B2 represents the color coordinates in the case where all the red subpixels, the green subpixels, and the blue subpixels are the all-cavity subpixels. Compared with the area indicated by R, G and B, it can be seen that the area indicated by R2, G2 and B2 is disadvantageous to the expression of red. To be more specific, the regions indicated by R2, G2 and B2 do not include a part of red among the regions indicated by R, G and B.

Next, in FIG. 13, the regions indicated by R3, G3, and B3 represent the color coordinates when the red subpixels, the green subpixels, and the blue subpixels are all the hybrid-cavity subpixels. Compared with the areas indicated by R, G and B, it can be seen that the areas indicated by R3, G3 and B3 are disadvantageous to the expressions of blue and red. In other words, the regions indicated by R3, G3, and B3 do not include the blue and red portions of the regions indicated by R, G, and B.

Therefore, referring to FIG. 13 and Table 1, it is preferable that the red subpixel be the non-cavity subpixel RN, the green subpixel be the hybrid cavity subpixel GH, It is preferable that the sub-pixel be the all-cavity sub-pixel BA.

The color coordinates by the subpixels composed of the above types determined by the above analysis are indicated by RN, GH, and BA in FIG. It can be seen that the region indicated by RN, GH, and BA contains most of the regions indicated by R, G, and B. That is, when the red subpixel is the non-cavity subpixel RN, the green subpixel is the hybrid cavity subpixel GH, and the blue subpixel is the all cavity subpixel BA, It can be seen that The unit pixel 120 set by the combination as described above is shown in FIG.

In the above description, the present invention has been described by way of example in which red, green, and blue subpixels constitute the unit pixel. However, the unit pixel may be composed of red, green, and blue subpixels, as well as subpixels that output different colors. In addition, the unit pixel may be composed of three or more sub-pixels.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: panel 200: gate driver
300: Data driver 400: Timing controller
110: subpixel 120: pixel
111a: first organic light emitting diode 111b: second organic light emitting diode
118a: Cavity anode 118b: Transparent anode

Claims (9)

A panel having a plurality of pixels formed therein; And
And a panel driver for driving the panel,
Each of the pixels comprising a plurality of subpixels,
In each of the subpixels,
Wherein at least one of a first organic light emitting diode having a cavity anode formed of a plurality of conductive materials and a second organic light emitting diode having a transparent anode formed of a conductive transparent material is formed. The method according to claim 1,
Wherein the first organic light emitting diode is formed in a bottom emission type in which light is output to the outside through the cavity anode and the second organic light emitting diode is a bottom emission type in which light is output to the outside through the transparent anode Wherein the organic light emitting display device comprises: The method according to claim 1,
Wherein the cavity anode is formed of two conductive transparent materials and a transparent metal thin film inserted between the two conductive transparent materials. The method according to claim 1,
In each of the subpixels,
Wherein the first organic light emitting diode and the second organic light emitting diode are both formed. 5. The method of claim 4,
Wherein the first organic light emitting diode and the second organic light emitting diode are simultaneously driven by one driver formed in the subpixel. The method according to claim 1,
The unit pixel for outputting the white light is composed of the first subpixel composed only of the first organic light emitting diode, the second subpixel composed only of the second organic light emitting diode, and the first organic light emitting diode and the second organic light emitting diode A third sub-pixel,
Wherein at least two sub-pixels of different types are formed in the unit pixel. The method according to claim 6,
Wherein the unit pixel includes a red subpixel, a green subpixel, and a blue subpixel,
The red subpixel is the second subpixel,
The green subpixel is the third subpixel,
And the blue sub-pixel is the first sub-pixel. The method according to claim 1,
In the nth horizontal line of the panel, first subpixels constituted by the first organic light emitting diode are formed,
And second sub-pixels composed of the second organic light emitting diode are formed on an (n + 1) th horizontal line of the panel. The method according to claim 1,
Wherein one horizontal line of the panel is formed with first subpixels composed of the first organic light emitting diode and second subpixels composed of the second organic light emitting diode.

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