KR102212776B1 - Display panel, method for manufacturing the same, and display apparatus employing the display panel - Google Patents

Abstract

Disclosed are a flat panel display panel using an organic light emitting display device and a quantum dot color conversion layer, and a display device employing the same.
The disclosed display panel includes a first substrate on which a first electrode for applying a driving power is formed; A separating unit installed at a predetermined height on the first substrate and separating first to third pixels each irradiated with red, green, and blue light; A first OLED layer formed in the entire region of the first and second pixels on the first electrode and a partial region of the third pixel to irradiate light having a predetermined wavelength; An intermediate electrode formed between the separation portions on the first OLED layer and electrically connected to the first electrode through an open space of a third pixel on which the first OLED layer is not formed; A second OLED layer formed on the intermediate electrode to irradiate light of a predetermined wavelength; A second electrode formed on the second OLED layer; A second substrate installed on the separating portion and disposed on the first substrate at a predetermined interval; A quantum dot color conversion layer provided at a position corresponding to at least one of the first pixel and the second pixel of the second substrate to emit light of a predetermined color; And a color filter formed on the quantum dot color conversion layer and transmitting color light of a predetermined wavelength.

Description

Display panel, its manufacturing method, and a display device employing the display panel {DISPLAY PANEL, METHOD FOR MANUFACTURING THE SAME, AND DISPLAY APPARATUS EMPLOYING THE DISPLAY PANEL}

The present invention relates to a display panel, a manufacturing method thereof, and a display device employing the display panel, and in particular, a flat panel display panel using an organic electroluminescent display device and a quantum dot color conversion layer, a manufacturing method thereof, and a display panel thereof. It relates to an adopted display device.

Recently, various types of flat panel display devices have been developed. This slim-type display device includes a liquid crystal display (LCD), an electro-luminescence display device (ELD), an electrophoretic display (EPD), and plasma, which are classified according to the display panel used. Plasma Display Panel Device (PDP), Field Emission Display device (FED), Electro-Wetting Display (EWD), and Organic Light Emitting Display (OLED) Etc. These display devices have a flat panel display panel that implements an image as an essential component.

Here, since the LCD uses a non-luminescent display panel, a backlight is essential, and an image is realized by turning the light irradiated from the backlight on/off in pixel units through the liquid crystal panel. Accordingly, since real black cannot be implemented, the contrast decreases. In addition, since the response speed of the liquid crystal is slow, there is a limit to the realization of high-quality video.

Among them, OLED is a self-luminous device, so it does not require a separate light source, so it can be lightweight and thin, has excellent viewing angle and contrast ratio compared to LCD, and is advantageous in terms of power consumption, and it is possible to drive DC low voltage and respond. There are advantages such as fast speed. Accordingly, OLED is attracting attention as an alternative to LCD.

This OLED is divided into RGB OLED and white OLED according to the color implementation method.

RGB OLED has the advantage of high light utilization efficiency in that the color is realized by using light-emitting diodes that emit red, green, and blue light respectively, and light that is all-light converted from each light-emitting diode is directly used. On the other hand, since this display panel must be manufactured by patterning the OLED for each pixel, there are difficulties in the process to manufacture it on a large-area substrate, and material development and structural design must be made for each of the R, G, and B light emitting diodes. There is a problem.

White OLED is a display that uses white OLED with a simple manufacturing process as a backlight and uses red, green, and blue color filters to realize an image. This white OLED has the advantage of being simple to manufacture because it uses one type of light-emitting diode. Meanwhile, since some of the white light irradiated from the white light emitting diode passes through the color filter and the rest is absorbed, there is a problem in that the light efficiency is lowered.

Republic of Korea Patent Publication No. 10-2014-0042274 (2014.04.07.) Republic of Korea Patent Publication No. 10-2016-0077617 (2016.07.04.) Korean Patent Application Publication No. 10-2017-0057041 (2017.05.24.)

The present invention was invented in view of the above problems, and an object thereof is to provide a display panel having a structure with improved light utilization efficiency and color reproducibility, a manufacturing method thereof, and a display device employing the display panel.

In order to achieve the above object, the display panel according to the present invention implements a color image as a set of first to third pixels respectively irradiating color light of red, green, and blue wavelengths, and the first to apply driving power. A first substrate on which electrodes are formed; A separating part installed at a predetermined height on the first substrate and separating the first to third pixels; A first organic light emitting diode (OLED) layer formed in the entire area of the first and second pixels on the first electrode and a partial area of the third pixel to irradiate light having a predetermined wavelength; An intermediate electrode formed between the separating portions on the first OLED layer and electrically connected to the first electrode through an open space of the third pixel on which the first OLED layer is not formed; A second OLED layer formed on the intermediate electrode to irradiate light of a predetermined wavelength; A second electrode formed on the second OLED layer; A second substrate installed on the separating portion and disposed on the first substrate at a predetermined interval; A quantum dot color conversion layer provided at a position corresponding to at least one of the first pixel and the second pixel of the second substrate to emit light of a predetermined color; And a color filter formed on the quantum dot color conversion layer and transmitting color light having a predetermined wavelength.

In addition, the present invention may further include an auxiliary layer provided at a predetermined height between the first electrode and the first OLED layer in the first pixel region to form an optical cavity.

In addition, the first OLED layer may include a yellow OLED layer that irradiates light of a yellow wavelength, and the second OLED layer may include a blue OLED layer that irradiates light of a blue wavelength, and the group in the third pixel The first electrode and the intermediate electrode are electrically connected to each other, and the third pixel implements color only with the blue OLED layer, and the first pixel includes the yellow OLED layer, the blue OLED layer, the red quantum dot color conversion layer, and A color is realized by a combination of a red color filter, and the second pixel may implement a color by a combination of the yellow OLED layer, the blue OLED layer, a green quantum dot color conversion layer, and a green color filter.

The blue OLED layer includes: a first light emitting unit including a hole injection layer, a hole transport layer, a light emitting layer emitting light having a blue wavelength, and an electron transport layer formed sequentially stacked on the first substrate; A charge generation layer formed on the first light-emitting portion; A second light emitting unit including a hole transport layer sequentially stacked on the charge generation layer, a light emitting layer emitting light of a predetermined wavelength, an electron transport layer and an electron injection layer, the first light emitting unit and the second light emitting The parts are connected in series, and a predetermined color light may be irradiated through the surface of the second light emitting part.

The separation unit may include a first separation unit installed on the first substrate at a predetermined height; It may include a second separation unit installed at a predetermined height at a position corresponding to the first separation unit on the second substrate.

In addition, the present invention provides a method of manufacturing a display panel for implementing a color image including a plurality of pixels as a set of first to third pixels respectively implementing colors of red, green, and green wavelengths, the upper part of the first substrate Forming a plurality of first separating portions formed at a predetermined height and partitioning the plurality of pixels; Forming a first electrode on the first substrate in the plurality of pixels; Forming a yellow OLED layer irradiating light of a yellow wavelength over the entire plurality of pixels on the first substrate; Irradiating a laser to the third pixel to remove at least a portion of the yellow OLED layer on the third pixel; Depositing and forming an intermediate electrode over the entire pixel so that the first electrode and the intermediate electrode are electrically connected in the third pixel region; Forming a blue OLED layer irradiating blue color light on the intermediate electrode so that white light is irradiated in the first and second pixel regions and blue light is irradiated in the third pixel region; Forming a second electrode on the blue OLED layer; Forming a plurality of second separation units at a predetermined height on a second substrate at a position corresponding to the first separation unit; Forming a red color filter and a green color filter on the second substrate at respective positions where the first and second pixels are formed; Forming a red quantum dot color conversion layer and a green quantum dot color conversion layer on each of the red color filter and the green color filter; The step of combining the first substrate and the second substrate while the first separation unit and the second separation unit face each other.

In addition, the present invention may further include forming an auxiliary layer forming an optical cavity between the first substrate and the yellow OLED layer in the first pixel.

In addition, the present invention provides a display panel for implementing a color image as a set of first to third pixels respectively irradiating color light of red, green, and blue wavelengths, the display panel comprising: a first substrate on which an electrode for applying driving power is formed; A separating part formed at a predetermined height on the first substrate to partition the first to third pixels; A first organic light emitting diode (OLED) layer formed on the first pixel and irradiating light of a red wavelength; A second OLED layer formed on the first and second pixels and irradiating light having a green wavelength; A third OLED layer formed on the first to third pixels and irradiating light having a blue wavelength; A second substrate installed on the separating portion and disposed on the first substrate at a predetermined interval; A quantum dot color conversion layer provided at positions corresponding to the first and second pixels of the second substrate to emit light of a predetermined color; And a color filter formed on the quantum dot color conversion layer and transmitting color light having a predetermined wavelength.

Here, the first pixel irradiates the light irradiated from each of the first to third OLED layers through the quantum dot color conversion layer and the color filter to light-converted red, and the second pixel is the second and second pixels. 3 The light irradiated from the OLED layer may be irradiated with light-converted green through the quantum dot color conversion layer and the color filter, and the third pixel may irradiate blue irradiated from the third OLED layer. Here, each of the first to third pixels may be driven by different power sources.

In addition, the present invention provides a method of manufacturing a display panel for implementing a color image including a plurality of pixels as a set of first to third pixels each implementing colors of green and green wavelengths, Forming a plurality of first separation units formed to have a predetermined height and partitioning the plurality of pixels; Forming a first OLED layer irradiating a red wavelength light over the entire plurality of pixels on a first substrate; Irradiating a laser to the second and third pixels to remove the first OLED layer on the second and third pixels; Forming a second OLED layer that irradiates green wavelength light over the entire plurality of pixels on the first substrate; Irradiating a laser to the third pixel to remove the second OLED layer on the third pixel; Forming a third OLED layer irradiating blue wavelength light over the entire plurality of pixels on the first substrate; Forming a plurality of second separating portions with a predetermined height at a position corresponding to the first separating portion on a second substrate; Forming a red color filter and a green color filter on the second substrate at respective positions where the first and second pixels are formed; Forming a red quantum dot color conversion layer and a green quantum dot color conversion layer on each of the red color filter and the green color filter; The step of combining the first substrate and the second substrate while the first separation unit and the second separation unit face each other.

In addition, a display device according to the present invention includes a display unit having a display panel as described above; An image processing unit processing an image signal input to the display panel; And a controller for controlling the image processing unit to display an image based on the image signal on the display panel.

The display panel and the display device employing the same according to the present invention may increase light transmittance in a blue pixel by excluding a color filter and a quantum dot color conversion layer in a portion corresponding to a blue pixel. In addition, by applying a yellow and blue OLED layer, a quantum dot color conversion layer, and a color filter to realize colors in green and red pixels, it is possible to improve light transmittance for these colors.

As a way to form a structure to increase the blue efficiency, a yellow OLED layer is formed over the entire pixel to simplify the OLED layer formation process, while for the third pixel region, the first electrode and the intermediate electrode are electrically connected. The OLED layer can be disabled. Accordingly, light of pure blue wavelength can be irradiated from the third pixel.

In addition, by forming an auxiliary layer that forms an optical cavity on the first substrate for the first pixel area, the wavelength characteristics of the light irradiated from the OLED layer, the quantum dot color conversion layer and the effect of the introduction of a color filter cause a full color image to be realized. Color reproducibility can be improved by improving uneven coloration.

In addition, the structure can be simplified by implementing a color image using the OLED layer and the quantum dot color conversion layer. In addition, when the OLED layer is used, a practical black image can be realized, so that color reproduction is excellent and power consumption can be reduced. Furthermore, by excluding the quantum dot color conversion layer in the portion corresponding to the blue pixel, it is possible to increase the light utilization efficiency.

1 is a schematic diagram showing a display panel according to a first embodiment of the present invention.
2A is a view showing the structure of the blue OLED layer of FIG. 1, and FIG. 2B is an equivalent circuit diagram of FIG. 2A.
Each of FIGS. 3A to 3G is a view for explaining a manufacturing process of the display panel of FIG. 1.
4 is a schematic diagram showing a display panel according to a second embodiment of the present invention.
5 is an equivalent circuit diagram for explaining the power supply structure of FIG. 4.
Each of FIGS. 6A to 6F is a view for explaining a manufacturing process of the display panel of FIG. 4.
7 is a schematic block diagram showing a display device employing a display panel according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and the same reference numerals will be used for the same or similar components throughout the specification.

1 is a schematic diagram showing a display panel according to a first embodiment of the present invention.

Referring to the drawings, the display panel according to the first embodiment of the present invention includes first and second substrates 10 and 50, a separating part 20, an electrode part, and a first and second organic light emitting diode layer ( Hereinafter, it is referred to as'OLED layer') (31) (35), color filters (60G) (60R) and quantum dot color conversion layers (71) (75), each selectively transmitting color light of different wavelengths A color image is implemented with a set of a plurality of pixels. Here, the plurality of pixels may include first to third pixels respectively implementing colors of blue (B), green (G), and red (R) wavelengths. The electrode portion includes first and second electrodes 41 and 45 and an intermediate electrode 43.

The separating part 20 divides the upper space of the first substrate 10 in pixel units and supports the first substrate 10 and the second substrate 50 to form a predetermined gap. The separating portion 20 may include first and second separating portions 21 and 25 installed at a predetermined height on the first and second substrates 10 and 50, respectively. Here, the first separating portion 21 and the second separating portion 25 are installed to face each other and are provided at positions corresponding to each other. The first electrode 41, the first OLED layer 31, the intermediate electrode 53, the second OLED layer 35, and the second OLED layer 35 are formed on the pixel region between the first separation unit 21 of the first substrate 10. The two electrodes 45 are sequentially formed.

The first electrode 41 is formed over the entire area of the first to third pixels. Power for driving the first and second OLED layers 31 and 35 is applied through the first electrode 51.

The first OLED layer 31 is formed in the entire region of the first and second pixels on the first electrode 41 and a partial region of the third pixel. That is, the first OLED layer 31 is partially formed in the third pixel region irradiating the blue wavelength light. This first OLED layer 31 may include a yellow OLED layer that irradiates light of a yellow wavelength.

The intermediate electrode 43 is formed on the first OLED layer 31, and the first electrode 41 is formed through the open space 43a of the third pixel in which the first OLED layer 31 is not formed. And is electrically connected. Here, the open space 43a may be formed in a partially open form as shown in FIG. 1 or may be formed in a form of a via hole. The intermediate electrode 43 may be formed of a transparent metal electrode having a structure in which a silver-magnesium alloy (Ag:Mg) is deposited to a thickness of about 50 Å.

Accordingly, when power is applied to the first electrode 41 and the intermediate electrode 43, the first OLED layer 31 located in the first and second pixel regions operates and irradiates light with a yellow wavelength. Meanwhile, in the third pixel region, since the first electrode 41 and the intermediate electrode 43 are electrically connected, the first OLED layer 31 on the third pixel region has the first electrode 41 and the intermediate electrode 43. ), does not irradiate yellow wavelength light.

The second OLED layer 35 is formed on the intermediate electrode 43 over the entire first to third pixel regions, and irradiates light of a predetermined wavelength. This second OLED layer may comprise a blue OLED layer that irradiates blue wavelength light. In addition, a second electrode 45 may be formed on the second OLED layer 35. Accordingly, when power is applied to the intermediate electrode 45 and the second electrode 45, the second OLED layer 35 located in the entire first to third pixel regions operates and irradiates light having a blue wavelength.

When the light irradiated from the first and second OLED layers 31 and 35 is combined, in the first and second pixel regions, the light of the white wavelength is combined with the light emitted from each of the yellow and blue OLED layers. Is irradiated in the direction of the second substrate 50. On the other hand, in the third pixel region, only the blue OLED layer is operated, and light of blue wavelength is irradiated toward the second substrate 50.

Accordingly, the first pixel implements color by combining the first and second OLED layers 31 and 35, the red quantum dot color conversion layer 71, and the red color filter 60R. In addition, the second pixel implements color by combining the first and second OLED layers 31 and 35, the green quantum dot color conversion layer 75, and the green color filter 60G. On the other hand, the third pixel implements a blue color (B) only with light irradiated from the second OLED layer 35.

The first and second OLED layers 31 and 35 are an active element, which is a light emitting layer structure that is controlled on a pixel-by-pixel basis, and is off when a black image is to be implemented, and a corresponding position when a predetermined image is to be implemented It is driven only for. Accordingly, an actual black image can be configured.

The blue OLED layer has a shorter life than the yellow OLED layer due to its nature. In consideration of this point, as shown in FIGS. 2A and 2B, an OLED layer may be configured in a tandem manner, and a structure for lowering the current density per unit area by connecting blue OLEDs in series can be applied.

Referring to FIG. 2A, the second OLED layer 35 includes a first light emitting part I, a charge generation layer (CGL), and a second light emitting part II. Here, each of the first light-emitting unit I and the second light-emitting unit II is a diode for generating and irradiating light, and are connected in series to each other as shown by an equivalent circuit in FIG. 2B. In addition, the second OLED layer 35 irradiates blue light in the direction of the arrow through the surface of the second light emitting portion II, that is, the upper surface of FIG. 2A.

To this end, the first light-emitting unit (I) is a hole injection layer (HIL), a hole transport layer (HTL), which are sequentially stacked on the substrate 10, and emits light of blue wavelength. It includes an emission layer (EML (Blue)) and an electron transport layer (ETL). The charge generation layer CGL is formed on the first light-emitting part I and serves to connect the first light-emitting part I and the second light-emitting part II in series. The second light emitting unit II includes a hole transport layer (HTL) sequentially stacked on the charge generation layer CGL, a light emitting layer emitting blue light (EML (Blue)), an electron transport layer (ETL), and Includes Electron Injection Layer (EIL).

As described above, in addition to configuring the OLED layer in a tandem method, a charge generation layer (CGL) is formed instead of providing a separate electrode layer between the first light emitting part (I) and the second light emitting part (II). By connecting in series through, there is an effect of extending the life of the blue OLED layer 35 and preventing deterioration. In addition, since the structure for emitting light to the upper surface of the second light emitting part II is applied, the light emitting area can be increased.

Quantum dot color conversion layers 71 and 75 Referring to FIG. 1, they are provided at a predetermined position on the second substrate 50 and emit light of a predetermined color. That is, the quantum dot color conversion layers 71 and 75 are provided at positions corresponding to the first and second pixels respectively implementing the colors of the red and green wavelengths of the second substrate 50. That is, the quantum dot color conversion layers 71 and 75 convert the incident white light into red or green and irradiate it. To this end, the quantum dot color conversion layer may include a red quantum dot color conversion layer 71 and a green quantum dot color conversion layer 75. Accordingly, the incident white light is converted into red or green light while passing through the red quantum dot color conversion layer 71 and the green quantum dot color conversion layer 75 and then proceeds in the direction of the color filters 60R and 60G.

The color filters 60R and 60G are formed between the second substrate 50 and the quantum dot color conversion layers 71 and 75, and are disposed at a pixel position that implements red and green among a plurality of pixels constituting an image. . The color filter may be composed of a red color filter 60R and a green color filter 60G. This color filter can implement a color image by selectively transmitting light of a predetermined wavelength. For example, the color color filter 70G transmits light of a green wavelength converted by the green quantum dot color conversion layer 75 and absorbs light of another wavelength, thereby providing a green image. As described above, by implementing white light implemented through the first and second OLED layers 31 and 35 and red and green colors formed by a combination of a quantum dot color conversion layer and a color filter, the light efficiency for these colors can also be improved. have.

Here, only the blue OLED layer among the yellow OELD layer and the blue OLED layer operates at the position corresponding to the blue pixel, and the quantum dot color conversion layer and color filter are not installed. Therefore, in implementing a blue pixel, the light transmittance can be improved to 95% or more, and thus light efficiency can be greatly improved. By implementing a display panel including the first and second OLED layers 31 and 35 and the quantum dot color conversion layers 71 and 75 as described above, the configuration can be simplified, color reproducibility is excellent, and light is used. You can increase the efficiency.

In addition, the display panel according to the first embodiment of the present invention is provided at a predetermined height between the first electrode 41 and the first OLED layer 31 in the first pixel area, and an auxiliary layer 80 forming an optical cavity. It may further include.

The auxiliary layer 80 has electrical conductivity and is formed of a material having high refractive index and transparency. For example, the auxiliary layer 80 may be made of ITO and IZO, which are a kind of transparent electrode material. When the auxiliary layer 80 is provided as described above, color reproducibility may be improved by forming an optical cavity between the first substrate 10 and the first OLED layer 31 in the red pixel region. In other words, when implementing a color image with a combination of light of blue, green, and red wavelength constituting each of the first to third pixels, the color tone due to the properties of the OLED layer, the quantum dot color conversion layer and the color filter that implement each color Fire unevenness may occur. In consideration of this point, it is possible to improve uneven colorization by adjusting the thickness of the auxiliary layer 80.

3A to 3G are diagrams for explaining a manufacturing process of the display panel of FIG. 1.

Referring to the drawings, in manufacturing the display panel according to the present invention, it can be manufactured by dividing into two parts and then combining them. First, a first part is completed by forming a predetermined component on the first substrate 10 through a process as shown in FIGS. 3A to 3E. In addition, as shown in FIG. 3F, the second part is completed by forming components such as color filters 60R and 60G and quantum dot color conversion layers 71 and 75 on the second substrate 50.

By installing the first part and the second part manufactured as described above to face each other as shown in FIG. 3G, a display panel having the structure as shown in FIG. 1 can be manufactured.

Hereinafter, a method of manufacturing the first and second parts will be described in detail with reference to FIGS. 3A to 3F.

Referring to FIG. 3A, a first substrate 10 is prepared, and a plurality of first separating portions 21 are formed on the first substrate 10 to have a predetermined height to divide a plurality of pixels. Subsequently, a first electrode 41 is formed on the first substrate 10 in the pixel area. Here, the plurality of pixels includes first to third pixels respectively irradiating red, green, and blue wavelengths of light.

Here, an auxiliary layer 80 forming an optical cavity may be formed on the first substrate 10. That is, the auxiliary layer 80 is formed on the electrode formed on the first substrate 10 and may be formed in the first pixel area irradiating red light.

Thereafter, as shown in FIG. 3B, a first OLED layer 31 that irradiates yellow wavelength light is formed over the entire pixel on the first substrate 10 through a deposition process. Subsequently, as shown in FIG. 3C, a part of the first OLED layer 31 in the third pixel area implementing the blue image is removed by a laser patterning process. Since the first OLED layer 31 is made of a material with a low evaporation point, it is sublimated even at relatively low energy. Therefore, by irradiating a portion of the third pixel region with the laser L, only the portion irradiated with the laser can be selectively removed from the first OLED layer. Here, the laser patterning process refers to a process of irradiating a laser after installing a mask covering an upper portion of the substrate excluding a portion of the third pixel area. In addition to the patterning process, the removal of the first OLED layer may be performed by selectively scanning a laser beam.

Subsequently, as shown in FIG. 3D, an intermediate electrode 43 is deposited over the entire pixel. Therefore, in the third pixel region, the first electrode 41 and the intermediate electrode 43 are electrically connected.

Thereafter, as shown in FIG. 3E, a second OLED layer 35 for irradiating blue color light is formed over the entire pixel by a deposition process or the like. Here, on the second OLED layer 35, a second electrode 45 to which power is applied to drive the second OLED layer 35 is formed.

By configuring as described above, white light may be irradiated in the first and second pixel regions of the first part, and blue light may be irradiated in the third pixel region.

As described above, the first part of the display panel may be manufactured through the process as shown in FIGS. 3A to 3E.

The second part of the display panel is manufactured as shown in FIG. 3F. Referring to FIG. 3F, a second substrate 50 made of a transparent material through which light is transmitted is prepared. Thereafter, a second separation unit 25 that divides the plurality of pixels into each pixel unit is formed on the second substrate 50 to a predetermined height. The second separating portion 25 may be formed to correspond to the installation position of the first separating portion 21.

Subsequently, color filters are formed in each of the first and second pixel regions. That is, a red color filter 60R and a green color filter 60G are formed on the second substrate 50 at positions where the first and second pixels are formed, respectively. Each of the red and green color filters 60R and 60G allows each of the red and green light converted by the quantum dot color conversion layer to be transmitted.

Next, a red quantum dot color conversion layer 71 is formed on the red color filter 60R, and a green quantum dot color conversion layer 75 is formed on the green color filter 60G.

Thereafter, referring to FIG. 3G, the second part of the display panel manufactured as described above is turned over and combined with the first part with the first separation unit 21 and the second separation unit 25 facing each other. A display panel having the structure as shown in Fig. 1 can be completed.

The display manufacturing method according to the present invention can simplify the OLED layer formation process by applying a process of depositing each of a yellow OLED layer and a blue OLED layer for all pixel areas in forming the first to third pixel regions. . On the other hand, the yellow OLED layer is removed by a laser patterning process for a part of the third pixel area, so that the first electrode and the intermediate electrode are electrically connected to each other so that the yellow OLED layer is not operated. Therefore, the light irradiated from the blue OLED layer is irradiated through the second substrate without passing through the quantum dot color conversion layer and the color filter, thereby maximizing the light transmission efficiency.

4 is a schematic diagram showing a display panel according to a second embodiment of the present invention.

Referring to the drawings, the display panel according to the second embodiment of the present invention includes first and second substrates 110 and 150, a separation unit 120, a plurality of OLED layers, a color filter 160R (160G), and Including the quantum dot color conversion layers 171 and 175, a color image is implemented as a set of a plurality of pixels that selectively transmit color light having different wavelengths, respectively. Here, the plurality of pixels may include first to third pixels respectively implementing colors of blue (B), green (G), and red (R) wavelengths.

An electrode (not shown) for applying driving power is formed on the first substrate 110. The separating part 120 divides the upper space of the first substrate 110 in pixel units and supports the first substrate 110 and the second substrate 150 to form a predetermined gap therebetween. The separating portion 120 may include first and second separating portions 121 and 125 installed at a predetermined height on the first and second substrates 110 and 150, respectively. Here, the first separating portion 121 and the second separating portion 125 are installed to face each other, and are provided at positions corresponding to each other.

The plurality of OLED layers may include first to third OLED layers 131, 133, and 135 for irradiating light of red, green, and blue wavelengths, respectively. That is, the first OLED layer 131 is formed on the first pixel and irradiates light of a red wavelength. The second OLED layer 131 is formed on the first and second pixels, and irradiates green wavelength light. In addition, the third OLED layer 135 is formed all over the first to third pixels, and irradiates light having a blue wavelength.

The second substrate 150 is disposed on the first substrate 110 at a predetermined interval, and the quantum dot color conversion layers 171 and 175 and the color filters 160R and 160G correspond to the first and second pixels. Is formed in the position. Here, each of the second substrate 150, the color filter 160R, 160G, the quantum dot color conversion layer 171, and 175 is a component having the same name among the components of the display panel according to the first embodiment and Since it is the same, a detailed description thereof will be omitted.

Therefore, in the first pixel, the first to third OLED layers 131, 133, and 135 are irradiated, and the light-converted red is irradiated through the quantum dot color conversion layer 171 and the color filter 160R. In the second pixel, green light is irradiated from the second OLED layer 133 and the third OLED layer 135 and light-converted through the quantum dot color conversion layer and the color filter. In the third pixel, blue irradiated from the third OLED layer 135 is irradiated.

When configuring a display panel as described above, the first and second OLED layers irradiating red and green light, respectively, are used instead of the yellow OLED layer. Accordingly, all of the first to third OLED layers contribute to light emission efficiency, thereby maximizing light efficiency.

5 is an equivalent circuit diagram for explaining the power supply structure of FIG. 4.

Referring to FIG. 5, each of the first to third pixels may be independently driven by different power sources. That is, each of the first to third OLED layers 131, 135, and 137 can be represented by diodes marked with red, green, and blue. In each of the red, green, and blue pixels, independent power supplies (ELVDD1, ELVDD2, ELVDD3) dedicated to red, green, and blue are applied through an independently disposed anode electrode. Meanwhile, the cathode electrodes of the diodes corresponding to the first to third pixels may be electrically interconnected. With this configuration, power can be independently controlled for each of the first to third pixel regions, thereby improving color reproducibility.

6A to 6F are diagrams for explaining a manufacturing process of the display panel of FIG. 4.

Referring to the drawings, in manufacturing the display panel according to the present invention, it can be manufactured by dividing into two parts and then combining them. First, a first part is completed by forming a predetermined component on the first substrate 110 through a process as shown in FIGS. 6A to 6E. Thereafter, the second part is completed by forming components such as color filters 160R and 160G and quantum dot color conversion layers 171 and 175 on the second substrate 150. Since the manufacturing process of the second part is the same as the manufacturing process of the second part of the display panel of FIG. 1 described with reference to FIG. 3F, a detailed description thereof will be omitted.

By installing the first part and the second part to face each other as shown in FIG. 6F, a display panel having the structure as shown in FIG. 4 can be manufactured.

Hereinafter, a method of manufacturing the first part will be described in detail with reference to FIGS. 6A to 6F.

Referring to FIG. 6A, a first substrate 110 on which an electrode is formed is prepared, and a plurality of first separating portions 121 formed at a predetermined height on the first substrate 110 to divide a plurality of pixels are provided. To form. Subsequently, a first OLED layer 131 ′ that irradiates red wavelength light is formed over the entire plurality of pixels on the first substrate 110 through a deposition process. Here, the plurality of pixels includes first to third pixels respectively irradiating red, green, and blue wavelengths of light.

Thereafter, as shown in FIG. 6B, by removing the first OLED layer 131 ′ in the second and third pixel regions implementing green and blue images by a laser patterning process, the first OLED layer ( 131) is finally formed. Since the first OLED layer 131 is made of a material with a low evaporation point, it is sublimated even at relatively low energy. Therefore, as shown in FIG. 6A, by irradiating the laser L to the second and third pixel regions, only the portion irradiated with the laser can be selectively removed from the first OLED layer.

Subsequently, as shown in FIG. 6C, after forming a second OLED layer 133' for irradiating green color light over the entire pixel on the first substrate 110 by a deposition process or the like, as shown in FIG. 6D As shown, by irradiating a laser (L) on the third pixel to remove the second OLED layer 133' on the third pixel, the second OLED layer 133 is finally formed only on the red and green pixel areas. do.

Subsequently, as shown in FIG. 6D, a third OLED layer 135 that irradiates blue color light is formed over the entire pixel on the first substrate 110 by a deposition process or the like, and the process of the first part is performed. To finish.

By configuring as described above, white light may be irradiated in the first and second pixel regions of the first part, and blue light may be irradiated in the third pixel region.

Here, the patterning process of the first and second OLED layers is substantially the same as the patterning process of the first and second OELD layers described above, and thus will be omitted. In addition, a second part process of sequentially forming red and green color filters 160R (160G), red quantum dot color conversion layer 171 and green quantum dot color conversion layer 175 on the second substrate 150 is carried out. do.

Thereafter, referring to FIG. 6F, the second part of the display panel manufactured as described above is turned over and combined with the first part with the first separation unit 121 and the second separation unit 125 facing each other. A display panel having the structure as shown in FIG. 4 can be completed.

The display manufacturing method according to the present invention is an OLED layer forming process by applying a process of depositing an OLED layer irradiating light of red, green, and blue wavelengths to all pixel areas in forming the first to third pixel regions. Can be simplified. For the third pixel area, the first and second OLED layers are removed by a laser patterning process, and the quantum dot color conversion layer and the color filter are not provided on the upper part, so that the light irradiated from the blue OLED layer passes through the second substrate. It is investigated. Accordingly, light transmission efficiency can be maximized.

7 is a schematic block diagram of a display device employing a display panel according to an exemplary embodiment of the present invention.

Referring to the drawings, a display apparatus 200 according to an embodiment of the present invention includes a user input unit 210, a display unit 220 including a display panel, an image processing unit 230, a control unit 240, and a power supply unit. Includes 250. Here, the display unit includes a display panel according to embodiments of the present invention described with reference to FIGS. 1 to 6F.

The image processing unit 230 performs a predetermined image processing process on the image signal input to the display unit 220 and outputs the processed image signal to the display unit 220. The image processing unit 230 may be implemented as an image processing board (not shown) embedded in the display device 200. The process performed by the image processing unit 110 includes decoding, de-interlacing, frame refresh rate conversion, scaling, and noise reduction for image quality improvement corresponding to various image formats. (noise reduction), detail enhancement, etc. may be included.

The control unit 240 controls the image processing unit 230 to display an image based on an image signal on the display unit 220. That is, the image processing unit 230 is controlled to display an image on the display unit 220 by processing an image signal input according to a signal input from the user input unit 210.

The user input unit 210 may be provided with a remote control (not shown) and a touch key or button (not shown) provided outside the display apparatus 200. In addition, it is wirelessly connected to the mobile terminal, and it is possible to input information through the mobile terminal.

The above-described embodiments are merely exemplary, and various modifications and other equivalent embodiments are possible from those of ordinary skill in the art to which the present invention pertains. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the invention described in the claims.

10, 110: first substrate
20, 120: separation unit
21, 121: first separation unit 25, 125: second separation unit
31, 131: first OLED layer
35, 133: second OLED layer
135: third OLED layer
41: first electrode
43: intermediate electrode
45: second electrode
50, 150: second substrate
71, 75, 171, 175: quantum dot color conversion layer
60R, 60G, 160R, 160G: color filter
80: auxiliary layer
200: display device

Claims (13)

In a display panel implementing a color image with a set of first to third pixels respectively irradiating color light of red, green, and blue wavelengths,
A first substrate on which a first electrode for applying driving power is formed;
A separating part installed at a predetermined height on the first substrate and separating the first to third pixels;
A first organic light emitting diode (OLED) layer formed in the entire area of the first and second pixels on the first electrode and a partial area of the third pixel to irradiate light having a predetermined wavelength;
An intermediate electrode formed between the separating portions on the first OLED layer and electrically connected to the first electrode through an open space of the third pixel on which the first OLED layer is not formed;
A second OLED layer formed on the intermediate electrode to irradiate light of a predetermined wavelength;
A second electrode formed on the second OLED layer;
A second substrate installed on the separating portion and disposed on the first substrate at a predetermined interval;
A quantum dot color conversion layer provided at a position corresponding to at least one of the first pixel and the second pixel of the second substrate to emit light of a predetermined color; And
It is formed on the quantum dot color conversion layer, and includes a color filter that transmits color light of a predetermined wavelength, and the first OLED layer on the third pixel region is Display panel, characterized in that not to irradiate. The method of claim 1,
The display panel, further comprising an auxiliary layer provided at a predetermined height between the first electrode and the first OLED layer in the first pixel area to form an optical cavity. The method of claim 1,
The first OLED layer includes a yellow OLED layer that irradiates light of a yellow wavelength,
The second OLED layer includes a blue OLED layer that irradiates light of a blue wavelength. The method of claim 3,
The first electrode and the intermediate electrode in the third pixel are electrically connected to each other, so that the third pixel implements color only with the blue OLED layer,
The first pixel implements color by a combination of the yellow OLED layer, the blue OLED layer, a red quantum dot color conversion layer and a red color filter,
The second pixel is a display panel, characterized in that the color is implemented by a combination of the yellow OLED layer, the blue OLED layer, a green quantum dot color conversion layer and a green color filter. The method of claim 3,
The blue OLED layer,
A first light-emitting unit including a hole injection layer, a hole transport layer, a light-emitting layer emitting blue light, and an electron transfer layer formed sequentially stacked on the first substrate;
A charge generation layer formed on the first light-emitting portion;
And a second light emitting unit including a hole transport layer sequentially stacked on the charge generation layer, a light emitting layer emitting light of a predetermined wavelength, an electron transport layer, and an electron injection layer,
The first light-emitting unit and the second light-emitting unit are connected in series, and a predetermined color light can be irradiated through a surface of the second light-emitting unit. The method of claim 1,
The separation unit,
A first separating part installed at a predetermined height on the first substrate;
And a second separation unit installed at a predetermined height on the second substrate at a position corresponding to the first separation unit. In the method of manufacturing a display panel according to any one of claims 1 to 6,
Forming a plurality of first separating portions formed at a predetermined height on the first substrate to partition the plurality of pixels;
Forming a first electrode on the first substrate in the plurality of pixels;
Forming a yellow OLED layer irradiating light of a yellow wavelength over the entire plurality of pixels on the first substrate;
Irradiating a laser to the third pixel to remove at least a portion of the yellow OLED layer on the third pixel;
Depositing and forming an intermediate electrode over the entire pixel so that the first electrode and the intermediate electrode are electrically connected in the third pixel region;
Forming a blue OLED layer irradiating blue color light on the intermediate electrode so that white light is irradiated in the first and second pixel regions and blue light is irradiated in the third pixel region;
Forming a second electrode on the blue OLED layer;
Forming a plurality of second separation units at a predetermined height on a second substrate at a position corresponding to the first separation unit;
Forming a red color filter and a green color filter on the second substrate at respective positions where the first and second pixels are formed;
Forming a red quantum dot color conversion layer and a green quantum dot color conversion layer on each of the red color filter and the green color filter;
And combining the first substrate and the second substrate while the first separating portion and the second separating portion face each other. The method of claim 7,
The method of manufacturing a display panel further comprising forming an auxiliary layer forming an optical cavity between the first substrate and the yellow OLED layer in the first pixel. In a display panel implementing a color image with a set of first to third pixels respectively irradiating color light of red, green, and blue wavelengths,
A first substrate on which an electrode for applying driving power is formed;
A separating part formed at a predetermined height on the first substrate to partition the first to third pixels;
A first organic light emitting diode (OLED) layer formed on the first pixel and irradiating light of a red wavelength;
A second OLED layer formed on the first and second pixels and irradiating light having a green wavelength;
A third OLED layer formed on the first to third pixels and irradiating light having a blue wavelength;
A second substrate installed on the separating portion and disposed on the first substrate at a predetermined interval;
A quantum dot color conversion layer provided at positions corresponding to the first and second pixels of the second substrate to emit light of a predetermined color; And
A display panel formed on the quantum dot color conversion layer and including a color filter transmitting color light of a predetermined wavelength. The method of claim 9,
The first pixel is irradiated from the first to third OLED layers and photoconverted red is irradiated through the quantum dot color conversion layer and the color filter,
The second pixel is irradiated from the second and third OLED layers and light-converted green is irradiated through the quantum dot color conversion layer and the color filter,
The third pixel is a display panel, characterized in that the blue irradiated from the third OLED layer. The method of claim 9,
Each of the first to third pixels is driven by a different power source. In the method of manufacturing a display panel for implementing a color image including a plurality of pixels as a set of first to third pixels respectively implementing colors of red, green and green wavelengths,
Forming a plurality of first separating portions formed at a predetermined height above the first substrate to partition the plurality of pixels;
Forming a first OLED layer irradiating a red wavelength light over the entire plurality of pixels on a first substrate;
Irradiating a laser to the second and third pixels to remove the first OLED layer on the second and third pixels;
Forming a second OLED layer that irradiates green wavelength light over the entire plurality of pixels on the first substrate;
Irradiating a laser to the third pixel to remove the second OLED layer on the third pixel;
Forming a third OLED layer irradiating blue wavelength light over the entire plurality of pixels on the first substrate;
Forming a plurality of second separation units at a predetermined height on a second substrate at a position corresponding to the first separation unit;
Forming a red color filter and a green color filter on the second substrate at respective positions where the first and second pixels are formed;
Forming a red quantum dot color conversion layer and a green quantum dot color conversion layer on each of the red color filter and the green color filter;
And combining the first substrate and the second substrate while the first separating portion and the second separating portion face each other. A display unit having a display panel according to any one of claims 1 to 6 and 9 to 11;
An image processing unit processing an image signal input to the display panel;
A display apparatus comprising: a control unit controlling the image processing unit to display an image based on the image signal on the display panel.

Images