Display device

Abstract

A display device is provided. The display device including a first pixel and a second pixel includes a light-emitting layer, a color conversion layer disposed on the light-emitting layer, and a color filter layer disposed on the color conversion layer, wherein the light-emitting layer includes a first light-emitting element disposed in the first pixel and a second light-emitting element disposed in the second pixel, wherein the color conversion layer includes a first color conversion layer disposed in the first pixel and a second color conversion layer disposed in the second pixel, the color filter layer includes a first color filter layer disposed in the first pixel and a second color filter layer disposed in the second pixel, the first light-emitting element and the second light-emitting element emit a first light, the center wavelength range of the first light is a first wavelength, the first color conversion layer and the second color conversion layer contain color conversion particles that convert the first light into a second light, the center wavelength range of the second light is a second wavelength longer than the first wavelength, the first color filter layer transmits the first light and blocks the transmission of the second light, and the second color filter layer transmits the second light and blocks the transmission of the first light.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is a national phase patent application and claims priority to and the benefit of International Application No. KR2018 / 011307, filed on September 21, 2018, which claims priority to Korean Patent Application No. 10-2018-0073582, filed on June 26, 2018, the entire contents of both of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a display device, and more particularly, to a display device including a color conversion material of the same type and a light emitting unit using an inorganic light emitting diode. Background Art

[0004] As multimedia technology develops, display devices are becoming more and more important. Therefore, various types of display devices such as organic light emitting display (OLED) devices and liquid crystal display (LCD) devices are currently used.

[0005] The display device is used to display an image and includes a display panel such as an organic light emitting display panel or a liquid crystal display panel. Among them, the light emitting display panel may include a light emitting element. For example, a light emitting diode (LED) may include an organic light emitting diode (OLED) using an organic material as a fluorescent material, and an inorganic light emitting diode using an inorganic material as a fluorescent material.

[0006] Organic light emitting diodes (OLEDs) use organic materials as fluorescent materials for light emitting elements. The advantages are that the manufacturing process is simple and the elements are flexible. However, it is known that organic materials are susceptible to high temperature driving environments and the efficiency of blue light is relatively low. Summary of the invention

[0007] Technical issues

[0008] Meanwhile, the display device may include a plurality of pixels, and the pixels may present blue, green, and red, respectively. If the pixel uses a light-emitting element that emits light of different colors, the same process is repeated three times during the process of manufacturing the display device in order to align the light-emitting element. On the other hand, if the pixel includes a light-emitting element that emits light of the same color, and a color conversion layer is formed above the light-emitting element, the process of aligning the light-emitting element is performed only once. However, the process of forming the color conversion layer is performed at least twice. As the number of processes performed to align the light-emitting element or form the color conversion layer increases, the cost may increase and the yield may decrease.

[0009] Aspects of the present disclosure provide a display device including a color conversion layer including color conversion particles of the same type, and a light emitting unit having two types of light emitting elements.

[0010] Aspects of the present disclosure provide a method of reducing the number of processes required to align a light emitting element and form a color conversion layer, thereby saving manufacturing costs of a display device and improving manufacturing yield.

[0011] It should be noted that aspects of the present disclosure are not limited to the above-mentioned aspects, and other unmentioned aspects of the present disclosure will be clearly understood by those skilled in the art from the following description.

[0012] Technical Solution

[0013] According to an aspect of the present disclosure, a display device including a first pixel and a second pixel includes: a light-emitting layer; a color conversion layer disposed on the light-emitting layer; and a color filter layer disposed on the color conversion layer, wherein the light-emitting layer includes a first light-emitting element disposed in the first pixel and a second light-emitting element disposed in the second pixel, wherein the color conversion layer includes a first color conversion layer disposed in the first pixel and a second color conversion layer disposed in the second pixel, the color filter layer includes a first color filter layer disposed in the first pixel and a second color filter layer disposed in the second pixel, the first light-emitting element and the second light-emitting element emit a first light, the center wavelength range of the first light is a first wavelength, the first color conversion layer and the second color conversion layer contain color conversion particles that convert the first light into a second light, the center wavelength range of the second light is a second wavelength longer than the first wavelength, the first color filter layer transmits the first light and blocks the transmission of the second light, and the second color filter layer transmits the second light and blocks the transmission of the first light.

[0014] The display device may further include a third pixel, wherein the light-emitting layer may further include a third light-emitting element arranged in the third pixel, wherein the color conversion layer may further include a third color conversion layer arranged in the third pixel, the color filter layer may further include a third color filter layer arranged in the third pixel, the third light-emitting element may emit a third light, the central wavelength range of the third light is a third wavelength longer than the second wavelength, the third color conversion layer may contain color conversion particles, and the third color filter layer blocks the transmission of the first light and the second light and transmits the third light.

[0015] The third color filter layer may receive third light.

[0016] The color conversion particles may not convert the third light.

[0017] Each of the first color filter layer and the second color filter layer may receive mixed light of the first light and the second light.

[0018] The color conversion particles may be dispersed in the first, second, and third color conversion layers, and wherein a density of the color conversion particles dispersed in the second color conversion layer may be greater than a density of the color conversion particles in each of the first and third color conversion layers.

[0019] An amount of the second light incident on the second color filter layer may be greater than an amount of the second light incident on the first color filter layer.

[0020] The center wavelength range of the first light may be within the range of 430 nm to 470 nm, wherein the center wavelength range of the second light may be within the range of 530 nm to 570 nm, and the color conversion particles may include quantum dot materials.

[0021] At least a portion of the first color conversion layer may overlap the first light-emitting element, wherein at least a portion of the second color conversion layer may overlap the second light-emitting element, at least a portion of the third color conversion layer may overlap the third light-emitting element, and the color conversion particles may be disposed adjacent to at least one of the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0022] The color conversion particles may be disposed to overlap with a side surface of at least one side of the first light emitting element, the second light emitting element, and the third light emitting element.

[0023] The light emitting layer may further include a first partition wall disposed between the first light emitting element and the second light emitting element, and a second partition wall disposed between the second light emitting element and the third light emitting element.

[0024] At least a portion of the first light emitted from the second light emitting element and transmitted toward the first color conversion layer or the third color conversion layer may be reflected off the first and second partition walls to be incident on the second color conversion layer.

[0025] The display device may include: a first planarization layer, which is arranged on the light-emitting layer to cover the first light-emitting element, the second light-emitting element and the third light-emitting element; a second planarization layer, which is arranged below the color conversion layer to provide a flat lower surface of the color conversion layer; and an adhesive layer, which is arranged between the first planarization layer and the second planarization layer, wherein the first planarization layer, the adhesive layer and the second planarization layer can be stacked on each other between the light-emitting layer and the color conversion layer.

[0026] According to aspects of the present disclosure, a display device including a first pixel, a second pixel, and a third pixel includes: a light-emitting layer; a color conversion layer disposed on the light-emitting layer; and a color filter layer disposed on the color conversion layer, wherein the light-emitting layer includes a first light-emitting element disposed in the first pixel, a second light-emitting element disposed in the second pixel, and a third light-emitting element disposed in the third pixel, the color conversion layer includes a first color conversion layer disposed in the first pixel, a second color conversion layer disposed in the second pixel, and a third color conversion layer disposed in the third pixel, and the color filter layer includes a first color filter layer disposed in the first pixel, a second color filter layer disposed in the second pixel, and a third color filter layer disposed in a third pixel, the first light emitting element, the second light emitting element, and the third light emitting element emitting mixed light of first light having a first wavelength and third light having a third wavelength, the third wavelength being longer than the first wavelength, the first color conversion layer, the second color conversion layer, and the third color conversion layer containing color conversion particles converting the first light into second light having a second wavelength, the second wavelength being longer than the first wavelength and shorter than the third wavelength, the first color filter layer transmitting the first light and blocking transmission of the second light and the third light, the second color filter layer transmitting the second light and blocking transmission of the first light and the third light, and the third color filter layer transmitting the third light and blocking transmission of the first light and the second light.

[0027] Mixed light of the first light and the second light may be incident on each of the first color conversion layer, the second color conversion layer, and the third color conversion layer.

[0028] Mixed light of the first light, the second light, and the third light may be incident on each of the first color filter layer, the second color filter layer, and the third color filter layer.

[0029] The color conversion particles may be dispersed in the first, second, and third color conversion layers, and wherein a density of the color conversion particles dispersed in the second color conversion layer may be greater than a density of the color conversion particles in each of the first and third color conversion layers.

[0030] An amount of the second light incident on the second color filter layer may be greater than an amount of the second light incident on the first color filter layer.

[0031] At least a portion of the first color conversion layer may overlap with the first light-emitting element, wherein at least a portion of the second color conversion layer may overlap with the second light-emitting element, at least a portion of the third color conversion layer overlaps with the third light-emitting element, and the color conversion particles may be disposed adjacent to at least one of the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0032] The display device may include: a first planarization layer, which is arranged on the light-emitting layer to cover the first light-emitting element, the second light-emitting element and the third light-emitting element; a second planarization layer, which is arranged below the color conversion layer to provide a flat lower surface of the color conversion layer; and an adhesive layer, which is arranged between the first planarization layer and the second planarization layer, wherein the first planarization layer, the adhesive layer and the second planarization layer can be stacked on each other between the light-emitting layer and the color conversion layer.

[0033] Details of other implementations are included in the detailed description and accompanying drawings.

[0034] Beneficial Effects

[0035] The display device according to the embodiment includes a first light-emitting element emitting light of a first color, a second light-emitting element emitting light of a third color, and a color conversion layer converting the light of the third color into light of a second color. Therefore, in a display device that displays light of a first color, light of a second color, and light of a third color, the number of processes required for the same configuration can be reduced. Therefore, the process cost required for manufacturing the display device can be saved and the manufacturing yield can be improved. In addition, the insufficient luminous efficiency of a specific light can be effectively compensated.

[0036] Advantageous effects according to the present disclosure are not limited to those mentioned above, and various other advantageous effects are included herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a cross-sectional view of a display device according to an exemplary embodiment of the present disclosure.

[0038] Figure 2 is a plan view showing a light emitting unit of a display device according to an exemplary embodiment of the present disclosure.

[0039] Figure 3 and Figure 4 is a cross-sectional view of a light emitting unit according to an exemplary embodiment of the present disclosure.

[0040] Figures 5 to 7 is a view showing a light emitting element according to an exemplary embodiment of the present disclosure.

[0041] Figures 8 to 10 is a view illustrating a method of aligning a light emitting element according to an exemplary embodiment of the present disclosure.

[0042] Fig.11 is a cross-sectional view of a color conversion unit according to an exemplary embodiment of the present disclosure.

[0043] Figure 12 to Figure 14 is a schematic diagram illustrating a process of forming a light emitting unit including a first light emitting element and a second light emitting element according to an exemplary embodiment of the present disclosure.

[0044] Figures 15 to 20 is a schematic diagram illustrating a method of forming a color conversion unit according to an exemplary embodiment of the present disclosure.

[0045] Fig.21 is a cross-sectional view of a display device according to another exemplary embodiment of the present disclosure.

[0046] Fig. 22 is a view showing that the color conversion particle ink containing color conversion particles is directly loaded in the light emitting unit.

[0047] Fig.23 is a plan view illustrating a light emitting unit of a display device according to still another exemplary embodiment of the present disclosure.

[0048] Fig.24 It is shown in Fig.23 FIG. 1 is a view of a process of aligning a light emitting element in a light emitting unit of a display device. DETAILED DESCRIPTION

[0049] The present invention will now be described more fully below with reference to the accompanying drawings, in which preferred embodiments of the present invention are shown. However, the present invention may be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the present invention to those skilled in the art.

[0050] It will also be understood that when a layer is referred to as being 'on' another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. The same reference numerals refer to the same components throughout the specification.

[0051] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the teachings of the present invention, the first element discussed below may be referred to as the second element. Similarly, the second element may also be referred to as the first element.

[0052] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0053] Figure 1 is a cross-sectional view of a display device according to an exemplary embodiment of the present disclosure.

[0054] Reference Figure 1, the display device 10 may include a plurality of pixels PX. The plurality of pixels PX may be disposed in a display area of ​​the display device 10, and they may respectively present light having a specific wavelength band to the outside of the display device 10. Figure 1 Three pixels PX1 , PX2 , and PX3 are depicted by way of example in FIG. 1 , but it will be understood that the display device 10 may include more than three pixels.

[0055] A plurality of pixels PX may emit light of different colors, respectively. For example, a first pixel PX1 may emit light L1 of a first color, a second pixel PX2 may emit light L2 of a second color, and a third pixel PX3 may emit light L3 of a third color. However, it will be understood that the present disclosure is not limited thereto. In some implementations, adjacent pixels PX may emit light of the same color. In the following description, it is assumed that the first pixel PX1, the second pixel PX2, and the third pixel PX3 emit light of different colors as described above.

[0056] According to an exemplary embodiment of the present disclosure, the center wavelength range of the light L1 of the first color is longer than the center wavelength range of the light L2 of the second color, and the center wavelength range of the light L2 of the second color is longer than the center wavelength range of the light L3 of the third color. For example, the light L1 of the first color may be red with a center wavelength range of about 610nm to 650nm, the light L2 of the second color may be green with a center wavelength range of about 530nm to 570nm, and the light L3 of the third color may be blue with a center wavelength range of about 430nm to 470nm. However, it will be understood that the present disclosure is not limited thereto. The light L1 of the first color, the light L2 of the second color, and the light L3 of the third color are not particularly limited as long as they have different center wavelength bands. In the following description, the light L1 of the first color is red, the light L2 of the second color is green, and the light L3 of the third color is blue, and the first pixel PX1 emits red light L1, the second pixel PX2 emits green light L2, and the third pixel PX3 emits blue light L3.

[0057] The display device 10 according to an exemplary embodiment of the present disclosure may include a light emitting unit 300 providing light having a specific wavelength band, and a color conversion unit 500 converting the light provided from the light emitting unit 300 into light having a different wavelength band.

[0058] The light emitting unit 300 and the color conversion unit 500 include portions overlapping with a plurality of pixels PX of the display device 10. Figure 1 In the present invention, for the convenience of description, the light emitting unit 300 is briefly described. For the convenience of description, the portion of the light emitting unit 300 overlapping with the first pixel PX1 is defined as the first pixel area PXa1 (see Figure 2), the portion of the light emitting unit 300 overlapping with the second pixel PX2 is defined as the second pixel area PXa2 (see Figure 2 ), and a portion of the light emitting unit 300 overlapping with the third pixel PX3 is defined as a third pixel area PXa3 (see Figure 2 A portion of the color conversion unit 500 that overlaps with the first pixel PX1 is defined as a first pixel layer PXb1 (see Fig.11 ), a portion of the color conversion unit 500 overlapping with the second pixel PX2 is defined as a second pixel layer PXb2 (see Fig.11 ), and a portion of the color conversion unit 500 overlapping with the third pixel PX3 is defined as a third pixel layer PXb3 (see Fig.11 ).

[0059] The light emitting unit 300 may include a light emitting element 350 (see Figure 2 ) to emit light having a specific wavelength band, thereby providing it to the color conversion unit 500. Figure 2 and Figure 3 The light emitting unit 300 is described in more detail.

[0060] Figure 2 is a plan view showing a light emitting unit of a display device according to an exemplary embodiment of the present disclosure. Figure 3 is a cross-sectional view of a light emitting unit according to an exemplary embodiment of the present disclosure. Figure 3 It is along Figure 2 The sectional view is taken along the lines I-I' and I"-I"'. Figure 3 Only one pixel region PXa of the light emitting unit 300 is shown, but it will be understood that the description may also be equally applied to other pixel portions.

[0061] The light-emitting unit 300 includes a light-emitting element 350 that emits light with a specific wavelength band. The light-emitting elements 350 in a plurality of pixel regions PXa may emit light with different wavelength bands. For example, when the light-emitting element 350 emits light in a blue wavelength band, a green wavelength band, or a red wavelength band, the plurality of pixel regions PXa may emit blue light, green light, or red light, respectively. However, it will be understood that the present disclosure is not limited thereto. In some implementations, a plurality of light-emitting elements 350 may emit light with a wavelength band of the same color, so that the pixel region PXa emits light of the same color (e.g., blue). In addition, a light-emitting element 350 that emits light with a wavelength band of different colors may be provided in a single pixel region PXa to emit light of different colors.

[0062] The light emitting unit 300 includes a base layer 310, a plurality of electrodes 330 disposed on the base layer 310, a contact electrode 360 ​​disposed on the electrode 330, and a plurality of light emitting elements 350 connected to the contact electrode 360. Each of the plurality of pixel regions PXa may further include a first partition wall 380 to distinguish it from an adjacent pixel region PXa.

[0063] The light emitting unit 300 includes a base layer 310 and a first electrode 331 and a second electrode 332, which are spaced apart from each other on the base layer 310 to face each other. The second partition wall 320 may be disposed on the base layer 310. The second partition wall 320 may be disposed on the inner side of the first partition wall 380. The first electrode 331 and the second electrode 332 may be respectively disposed on the second partition wall 320 to cover the second partition wall 320. The second partition wall 320 may be made of an organic material such as polyimide, but is not limited thereto.

[0064] The light emitting element 350 may be disposed between the first electrode 331 and the second electrode 332 which are spaced apart from each other. Figure 3 In the example shown in , the first electrode 331 and the second electrode 332 are directly disposed on the base layer 310 , but the present disclosure is not limited thereto. Other layers or features may be disposed between the base layer 310 and the first electrode 331 and the second electrode 332 .

[0065] The light emitting element 350 may be formed by an active material layer 353 (see Figure 5 ) materials to emit light of different colors. Different types of light-emitting elements 350 can be aligned in the pixel area PXa, and therefore, different colors of light can be emitted from the pixel area PXa of the light-emitting unit 300. It will be noted that when the light-emitting element 350 is set by using the dielectrophoresis (DEP) technology, the same process must be repeated several times. Thereby, the process cost may be increased, and the yield may be reduced. In view of the above, the light-emitting unit 300 of the display device 10 according to the exemplary embodiment of the present disclosure includes a light-emitting element 350 that emits light with fewer types of colors, thereby reducing the number of processes to be repeated. The display device 10 according to the exemplary embodiment may include a first light-emitting element 350_1 that emits red light L1 and a second light-emitting element 350_2 that emits blue light L3. A detailed description thereof will be given later.

[0066] The base layer 310 may support structures disposed thereon, for example, the second partition wall 320, the electrode 330, the light emitting element 350, and the first partition wall 380. The base layer 310 may include an insulating material. The base layer 310 may include an inorganic material or an organic material. In some exemplary embodiments, a glass substrate, a crystal substrate, a sapphire substrate, a plastic substrate, and a flexible polymer film may be used as the base layer 310, and the substrate may be stacked with a circuit below.

[0067] The first electrode 331 and the second electrode 332 may be disposed on the base layer 310 to be spaced apart from each other. Each of the first electrode 331 and the second electrode 332 may receive an electrical signal. For example, the first electrode 331 may be connected to the first drain electrode 123 thereunder through a first contact hole penetrating the base layer 310 to receive a driving voltage therefrom. The second electrode 332 may be electrically connected to the connection line 162 thereunder through a second contact hole penetrating the base layer 310 to receive a power supply voltage therefrom. When current flows in the light emitting element 350 by an electrical signal applied to the light emitting element 350 disposed between the first electrode 331 and the second electrode 332, the light emitting element 350 may emit light.

[0068] The first electrode 331 may be spaced apart from the second electrode 332 by a predetermined distance that is equal to or less than the length of the light emitting element 350. Therefore, electrical contact between the light emitting element 350 and the first and second electrodes 331 and 332 may be easily and reliably achieved.

[0069] There may be one or more first electrodes 331 and second electrodes 332. The first electrodes 331 and second electrodes 332 may be alternately arranged in each of the pixel regions PXa. In order to arrange the first electrodes 331 and second electrodes 332 so as to face each other, the number of first electrodes 331 may be equal to the number of second electrodes 332, or one more first electrode 331 or one more second electrode 332 may be provided. Figure 2 In the example shown in FIG. 1 , two first electrodes 331 and one second electrode 332 are disposed in each of the pixel regions PXa, but the present disclosure is not limited thereto.

[0070] It will be noted that for ease of explanation, Figure 1 , Figure 3 Only one first electrode 331 and one second electrode 332 are depicted in the cross-sectional views of the other drawings, and the other first electrode 331 is omitted. The structure between the other first electrode 331 and the second electrode 332 may be substantially the same as the structure between the first electrode 331 and the second electrode 332 shown in the drawings. However, it will be understood that the present disclosure is not limited thereto, and the structure may be partially changed.

[0071] The second electrodes 332 disposed in the respective pixel regions PXa may be electrically connected to each other. Figure 2 As shown in FIG. 1 , the ends of the second electrodes 332 disposed in the respective pixel regions PXa may be connected to a single line. Therefore, the same electrical signal may be applied to the pixel regions PXa included in the display device 10 through the second electrodes 332 .

[0072] On the other hand, the first electrode 331 may not be electrically connected to the first electrode 331 of another adjacent pixel region PXa. Therefore, even if the same electrical signal is applied from the second electrode 332, different electrical signals may be applied to the first electrodes 331 of the pixel regions PXa, so that they may be driven separately. However, when more than one first electrode 331 is provided in a single pixel region PXa, the plurality of first electrodes 331 provided together in the pixel region PXa may be electrically connected to each other. Therefore, the same electrical signal may be applied to the light emitting element 350 in the single pixel region PXa.

[0073] The first electrode 331 may include a reflective layer 331_1 formed on the second partition wall 320 , and an electrode layer 331_2 , and the second electrode 332 may include a reflective layer 332_1 formed on the second partition wall 320 , and an electrode layer 332_2 .

[0074] The reflective layers 331_1 and 332_1 may reflect the light emitted from the light emitting element 350 so that the light is transmitted toward the outside of the display device 10. The light emitted from the light emitting element 350 radiates in all directions without directivity. The light traveling toward the reflective layers 331_1 and 332_1 may be reflected away from the reflective layers 331_1 and 332_1, and may be transmitted to the outside of the display device 10, for example, to the upper side of the reflective layers 331_1 and 332_1. Thus, the light emitted from the light emitting element 350 may be concentrated in one direction to improve the light emission efficiency. The reflective layers 331_1 and 332_1 may include a material having a high reflectivity to reflect the light emitted from the light emitting element 350. For example, the reflective layers 331_1 and 332_1 may include, but are not limited to, materials such as silver (Ag) and copper (Cu).

[0075] The electrode layers 331_2 and 332_2 are formed on the reflective layers 331_1 and 332_1, respectively. The electrode layers 331_2 and 332_2 may transmit the electrical signals applied thereto to the contact electrode 360. The electrode layers 331_2 and 332_2 may include a transparent conductive material. For example, the electrode layers 331_2 and 332_2 may include, but are not limited to, materials such as indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO).

[0076] The electrode layers 331_2 and 332_2 may transmit the electrical signals transmitted to the reflective layers 331_1 and 332_1 to the contact electrodes 360 to be described later, respectively. The electrode layers 331_2 and 332_2 may include a transparent conductive material. For example, the electrode layers 331_2 and 332_2 may include, but are not limited to, materials such as indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO). In some exemplary embodiments, each of the reflective layers 331_1 and 332_1 and the electrode layers 331_2 and 332_2 may have a structure in which at least one transparent conductive layer (such as ITO, IZO, and ITZO) and at least one metal layer (e.g., silver and copper) are stacked on each other. For example, the reflective layers 331_1 and 332_1 and the electrode layers 331_2 and 332_2 may form a stacked structure of ITO / silver (Ag) / ITO.

[0077] According to an exemplary embodiment of the present disclosure, the electrode layers 331_2 and 332_2 have substantially the same shape as the reflective layers 331_1 and 332_1, but the electrode layers 331_2 and 332_2 have a larger size (or width) than the reflective layers 331_1 and 332_1, so that the electrode layers 331_2 and 332_2 can cover the side surfaces and the upper surfaces of the reflective layers 331_1 and 332_1. However, it will be understood that the present disclosure is not limited thereto.

[0078] The first contact electrode 361 and the second contact electrode 362 may be disposed on the upper surfaces of the electrode layers 331_2 and 332_2 to transmit electrical signals applied to the electrode layers 331_2 and 332_2. The first contact electrode 361 and the second contact electrode 362 may be connected to the first semiconductor layer 351 of the light emitting element 350 (see Figure 5 ) and the second semiconductor layer 352 (see Figure 5 ). Therefore, the first contact electrode 361 and the second contact electrode 362 can transmit the electrical signal applied to the electrode layers 331_2 and 332_2 to the light emitting element 350, so that light can be emitted. In the following drawings, for the convenience of explanation, the electrode layers 331_2 and 332_2 and the reflective layers 331_1 and 332_1 are not distinguished, and only the first electrode 331 and the second electrode 332 are shown.

[0079] The first contact electrode 361 and the second contact electrode 362 may include a conductive material. For example, the contact electrode 360 ​​may include ITO, IZO, ITZO, aluminum (Al), etc. However, it will be understood that the present disclosure is not limited thereto.

[0080] The first contact electrode 361 and the second contact electrode 362 may include the same material as the electrode layers 331_2 and 332_2. The first contact electrode 361 and the second contact electrode 362 may be disposed on the electrode layers 331_2 and 332_2 in the same pattern so that the first contact electrode 361 and the second contact electrode 362 may contact the electrode layers 331_2 and 332_2. The first contact electrode 361 and the second contact electrode 362 contacting the electrode layers 331_2 and 332_2 may receive an electrical signal applied to the electrode layers 331_2 and 332_2 and transmit it to the light emitting element 350.

[0081] The first electrode 331 , the second electrode 332 , the light emitting element 350 , the first contact electrode 361 , and the second contact electrode 362 may be covered by a plurality of insulating material layers 370 .

[0082] The plurality of insulating material layers 370 may include a first insulating material layer 371 , a second insulating material layer 372 , a third insulating material layer 373 , and a fourth insulating material layer 374 .

[0083] The first insulating material layer 371 may be disposed between the first electrode 331 and the second electrode 332. Figure 3 As shown in , the first insulating material layer 371 may be disposed between the first electrode 331 and the second electrode 332, and the light emitting element 350 may be disposed on the first insulating material layer 371. The first insulating material layer 371 may protect the electrode layers 331_2 and 332_2 of the first electrode 331 and the second electrode 332, and may also prevent the semiconductor layers 351 and 352 of the light emitting element 350 from contacting other elements, thereby preventing damage to the light emitting element 350.

[0084] One surface of the first insulating material layer 371 may be in contact with the base layer 310, and the light emitting element 350 may be disposed on the opposite surface. The electrode layers 331_2 and 332_2 may be in contact with both sides of the first insulating material layer 371, respectively, so that the electrode layers 331_2 and 332_2 may be electrically insulated. Figure 3In the cross-sectional view of , the first insulating material layer 371 presents a rectangular shape with a linear side surface, but the present disclosure is not limited thereto. The surfaces of the first insulating material layer 371 in contact with the electrode layers 331_2 and 332_2 may be aligned with the two side portions of the light emitting element 350, respectively, but the present disclosure is not limited thereto. The length of the light emitting element 350 may be shorter than the length of the first insulating material layer 371, so that when viewed from the top, the two side portions of the first insulating material layer 371 may protrude. As a result, the first insulating material layer 371 and the light emitting element 350 may be stacked like a ladder. In this case, the surface of each of the first contact electrode 361 and the second contact electrode 362 in contact with the side surface of the light emitting element 350 may have a smooth shape.

[0085] In addition, a second insulating material layer 372 may be provided to protect the light emitting element 350 and to electrically insulate the first contact electrode 361 and the second contact electrode 362. The second insulating material layer 372 may be provided on the light emitting element 350, and may be recessed from the side surface of the light emitting element 350 toward the center. In other words, the length of the second insulating material layer 372 may be shorter than the length of the light emitting element 350. Similar to the first insulating material layer 371, when the second insulating material layer 372 is provided, the surface of each of the first contact electrode 361 and the second contact electrode 362 that contacts the side surface of the light emitting element 350 may have a smooth shape.

[0086] The third insulating material layer 373 may be disposed on the first contact electrode 361 to electrically insulate it from the second contact electrode 362. The third insulating material layer 373 may be disposed to cover the first contact electrode 361 and may not overlap a portion of the light emitting element 350 so that the light emitting element 350 may be connected to the second contact electrode 362.

[0087] A fourth insulating material layer 374 may be formed on the third insulating material layer 373 and the second contact electrode 362 to serve as a protective layer for the external environment. If the contact electrode 360 ​​is exposed, the electrode may be damaged, and thus the contact electrode material may be disconnected. To prevent this, the fourth insulating material layer 374 may cover them. That is, the fourth insulating material layer 374 may be provided to cover the first electrode 331, the second electrode 332, and the light emitting element 350 of the light emitting unit 300.

[0088] Each of the first insulating material layer 371, the second insulating material layer 372, the third insulating material layer 373, and the fourth insulating material layer 374 may include, for example, silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ), aluminum oxide (Al2 O 3 ) and aluminum nitride (AlN). The first insulating material layer 371, the second insulating material layer 372, the third insulating material layer 373, and the fourth insulating material layer 374 may be made of the same material or different materials. In addition, any of various materials having insulating properties may be applied to the first insulating material layer 371, the second insulating material layer 372, the third insulating material layer 373, and the fourth insulating material layer 374.

[0089] One or more first partition walls 380 may be disposed on the base layer 310 to separate the plurality of pixel regions PXa of the light emitting unit 300 from each other. Figure 2 As shown in FIG. 3 , the first partition walls 380 may be spaced apart from each other, and the first electrode 331, the second electrode 332, and the light emitting element 350 may be disposed between the first partition walls 380 spaced apart from each other. In addition, the first partition walls 380 may be formed to cover the electrode lines.

[0090] In the light emitting unit 300, for the light emitting element 350 emitting light having a specific wavelength, the pixel region PXa is separated by the first partition wall 380. The first partition wall 380 may be disposed between the pixel regions PXa to prevent the light emitting element 350 from moving to another adjacent pixel region PXa when aligning the light emitting element 350. For example, the first partition wall 380 may be, but is not limited to, polyimide (PI). The first partition wall 380 may have a hydrophobic surface.

[0091] However, it will be understood that the present disclosure is not limited thereto. The first partition wall 380 may distinguish a plurality of pixel regions PXa from other plurality of pixel regions PXa. That is, a plurality of pixel regions PXa may be provided in the region formed by the first partition wall 380. When the plurality of pixel regions PXa include light emitting elements 350 that emit light of the same color, the same light emitting elements 350 may be aligned together in the plurality of pixel regions PXa. In this case, the light emitting element 350 may be moved to an adjacent pixel region PXa, and therefore the pixel region PXa may not be divided by the first partition wall 380.

[0092] In addition, the first partition wall 380 can prevent the color mixing of the light emitted from the light emitting element 350. When the adjacent pixel area PXa includes the light emitting element 350 that emits light with different wavelength bands, the light emitted from the pixel area PXa may be mixed. In order to prevent this, the first partition wall 380 can be provided between the pixel areas PXa in the light emitting unit 300 so that the light emitted from one pixel area PXa does not enter another pixel area PXa, thereby preventing color mixing. In this way, the color gamut of the display device 10 can be improved.

[0093] In addition, in order to provide a flat upper surface of the light emitting unit 300, a planarization layer covering the element may be further included. As will be described later, when the light emitting unit 300 and the color conversion unit 500 are formed by different processes and then attached together to manufacture the display device 10, it is necessary to flatten the interface between the light emitting unit 300 and the color conversion unit 500. To this end, the light emitting unit 300 may include a planarization layer to have a flat upper surface.

[0094] In some exemplary embodiments, Figure 3 As shown in , the display device 10 may further include a circuit electrically connected to the light emitting element 350 and controlling the emission of the light emitting element 350. The circuit may include at least one thin film transistor and at least one capacitor.

[0095] Specifically, the circuit may be disposed below the light emitting unit 300 .

[0096] The circuit may include an insulating substrate 110, a buffer layer 115 disposed on the insulating substrate 110, a first thin film transistor 120 disposed on the buffer layer 115, a second thin film transistor 140, and a power line 161. The configuration of the circuit is not limited thereto. It may include two or more thin film transistors and one or more capacitors, and thus may have different structures.

[0097] The first thin film transistor 120 includes a first active layer 126, a first gate electrode 121, a first drain electrode 123, and a first source electrode 124. A first gate insulating layer 170 may be disposed between the first gate electrode 121 and the first active layer 126 to insulate them from each other. A second gate insulating layer 180 and an interlayer dielectric layer 190 may be disposed between the first gate electrode 121 and the first drain electrode 123 and between the first gate electrode 121 and the first source electrode 124. A capacitor electrode 128 may be disposed between the second gate insulating layer 180 and the interlayer dielectric layer 190. The capacitor electrode 128 may form a storage capacitor with the first gate electrode 121. The first thin film transistor 120 may be disposed below the light emitting element 350 and may partially overlap the light emitting element 350. The first thin film transistor 120 may be a driving thin film transistor for driving the light emitting element 350.

[0098] The second thin film transistor 140 includes a second active layer 146, a second gate electrode 141, a second drain electrode 143, and a second source electrode 144. The first gate insulating layer 170 may be disposed between the second gate electrode 141 and the second active layer 146 to insulate them from each other. The second gate electrode 141 may overlap a portion of the second active layer 146 on the first gate insulating layer 170. The second gate insulating layer 180 and the interlayer dielectric layer 190 may be disposed between the second gate electrode 141 and the second drain electrode 143 and between the second gate electrode 141 and the second source electrode 144. The second thin film transistor 140 may be disposed below the light emitting element 350 and may partially overlap the light emitting element 350. The second thin film transistor 140 may be a switching thin film transistor.

[0099] However, it will be understood that the present disclosure is not limited thereto. The second thin film transistor 140 may be disposed so as not to overlap with the light emitting element 350 . Figure 4 It is along Figure 2 The cross-sectional view taken along the lines II-II' and III-III'. Figure 4 , the power line 161 may be disposed outside the pixel region PXa of the light emitting unit 300. For example, Figure 2 As shown in FIG. 1 , the power line 161 may be disposed in an area (eg, an area where the line III-III' is drawn) outside the pixel area PXa of the light emitting unit 300. The light emitting element 350 may contact the power line 161 through a line extending from the second electrode 332 in an area outside the pixel area PXa.

[0100] The power line 161 may be disposed on the same layer as the first gate electrode 121 of the first thin film transistor 120 and the second gate electrode 141 of the second thin film transistor 140. The power line 161 may be electrically connected to the second electrode 332 using a connection line 162. Thus, the second electrode 332 may be electrically connected to the power line 161 to receive power from the power line 161. An auxiliary layer 163 may be disposed below the power line 161 to reduce a level difference with a surrounding area. The auxiliary layer 163 is not an essential element and may be omitted.

[0101] The first gate insulating layer 170 may be disposed on the buffer layer 115 to cover the first active layer 126 and the second active layer 146. The second gate insulating layer 180 may be disposed on the first gate insulating layer 170 to cover the first gate electrode 121 and the second gate electrode 141.

[0102] The interlayer dielectric layer 190 may be composed of a single layer or multiple layers including an organic material or an inorganic material, and may be disposed on the second gate insulating layer 180. It will be noted that the second gate insulating layer 180 or the interlayer dielectric layer 190 may be omitted.

[0103] The first drain electrode 123 and the first source electrode 124, and the second drain electrode 143 and the second source electrode 144 may be formed on the interlayer dielectric layer 190. The first drain electrode 123 and the first source electrode 124 may be connected to the drain region and the source region of the first active layer 126, respectively, through contact holes formed through the first gate insulating layer 170, the second gate insulating layer 180, and the interlayer dielectric layer 190. The second drain electrode 143 and the second source electrode 144 may be connected to the drain region and the source region of the second active layer 146, respectively, through contact holes formed through the first gate insulating layer 170, the second gate insulating layer 180, and the interlayer dielectric layer 190.

[0104] The first gate insulating layer 170 may cover the auxiliary layer 163, and a power line 161 overlapping the auxiliary layer 163 may be formed on the first gate insulating layer 170. The power line 161 may be made of the same material as the first gate electrode 121 and the second gate electrode 141 through the same process. However, it will be understood that the present disclosure is not limited thereto. The auxiliary layer 163 may be made of a different material from the first gate electrode 121 and the second gate electrode 141 through a separate process.

[0105] The second gate insulating layer 180 and the interlayer dielectric layer 190 may be disposed on the power line 161, and the connection line 162 may be formed on the interlayer dielectric layer 190. The connection line 162 may be electrically connected to the power line 161 through a contact hole formed through the second gate insulating layer 180 and the interlayer dielectric layer 190.

[0106] As described above, a plurality of light emitting elements 350 are disposed between the first electrode 331 and the second electrode 332. Each of the light emitting elements 350 may include an active material layer 353 to emit light having a specific wavelength band. The light emitting elements 350 may emit light having different wavelengths, or may emit light having the same wavelength.

[0107] According to an exemplary embodiment of the present disclosure, the light emitting element 350 may be formed on the substrate by epitaxial growth. Specifically, a seed layer for forming a semiconductor layer is formed on the substrate, and then a desired semiconductor material is deposited and grown thereon. Crystals are grown on the seed layer to form a plurality of semiconductor layers 351 and 352, thereby forming the light emitting element 350. Once the light emitting element 350 is formed, the light emitting element 350 may be separated from the substrate and aligned between the first electrode 331 and the second electrode 332. Hereinafter, reference will be made to Figures 5 to 7 The structure of the light emitting element 350 is described in detail.

[0108] Figures 5 to 7 is a view showing a light emitting element according to an exemplary embodiment of the present disclosure.

[0109] First, refer to Figure 5 The light emitting element 350 may include a plurality of semiconductor layers 351 and 352 and an active material layer 353 disposed between the plurality of semiconductor layers 351 and 352. An electrical signal applied from the first electrode 331 and the second electrode 332 may be transmitted to the active material layer 353 via the plurality of semiconductor layers 351 and 352 to emit light.

[0110] Specifically, the light emitting element 350 may include a first semiconductor layer 351 , a second semiconductor layer 352 , an active material layer 353 disposed between the first semiconductor layer 351 and the second semiconductor layer 352 , and an insulating layer 354 . Figure 5 An example of a light emitting element 350 having a structure in which a first semiconductor layer 351 , an active material layer 353 , and a second semiconductor layer 352 are sequentially stacked in a longitudinal direction is shown.

[0111] The first semiconductor layer 351 may be an n-type semiconductor layer. For example, when the light emitting element 350 emits light having a blue wavelength band, the first semiconductor layer 351 may be a semiconductor material having the following molecular formula: In x Al y Ga 1-x-y N(0≤x≤1, 0≤y≤1, 0≤x+y≤1). For example, it may be at least one of n-type doped InAlGaN, GaN, AlGaN, InGaN, AlN, and InN. The first semiconductor layer 351 may be doped with a first conductive type dopant. For example, the first conductive type dopant may be Si, Ge, Sn, etc. The length of the first semiconductor layer 351 may be in the range of 1.5 μm to 5 μm, but is not limited thereto.

[0112] The second semiconductor layer 352 may be a p-type semiconductor layer. For example, when the light emitting element 350 emits light having a blue wavelength band, the second semiconductor layer 352 may be a semiconductor material having the following molecular formula: In x Al y Ga 1-x-y N(0≤x≤1, 0≤y≤1, 0≤x+y≤1). For example, it may be at least one of p-type doped InAlGaN, GaN, AlGaN, InGaN, AlN, and InN. The second semiconductor layer 352 may be doped with a second conductive type dopant. For example, the second conductive type dopant may be Mg, Zn, Ca, Se, Ba, etc. The length of the second semiconductor layer 352 may be in the range of 0.08 μm to 0.25 μm, but is not limited thereto.

[0113] The active material layer 353 may be disposed between the first semiconductor layer 351 and the second semiconductor layer 352, and may include a material having a single quantum well structure or a multi-quantum well structure. The active material layer 353 may emit light by combining electron-hole pairs therein in response to an electrical signal applied through the first semiconductor layer 351 and the second semiconductor layer 352. For example, when the active material layer 353 emits light having a blue wavelength band, it may include materials such as AlGaN and AlInGaN. Depending on the wavelength band of the emitted light, the active material layer 353 may include other III-group to V-group semiconductor materials. Therefore, the light emitted from the active material layer 353 is not limited to light having a blue wavelength band. In some implementations, the active material layer 353 may emit light having a red wavelength band or a green wavelength band. The length of the active material layer 353 may be in the range of 0.05 μm to 0.25 μm, but is not limited thereto.

[0114] Light emitted from the active material layer 353 may be emitted not only through the outer surface of the light emitting element 350 in the longitudinal direction but also through both side surfaces. That is, the direction in which light emitted from the active material layer 353 propagates is not limited to one direction.

[0115] The insulating layer 354 may be formed outside the light emitting element 350 to protect the light emitting element 350. For example, the insulating layer 354 may be formed to surround the side surface of the light emitting element 350 and not be located at both ends of the light emitting element 350 in the longitudinal direction (for example, where the first semiconductor layer 351 and the second semiconductor layer 352 are provided). However, it will be understood that the present disclosure is not limited thereto. The insulating layer 354 may include a material such as silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ), aluminum nitride (AlN) and aluminum oxide (Al 2 O 3 ) with insulating properties. Therefore, an electrical short circuit that may be generated when the active material layer 353 contacts the first electrode 331 or the second electrode 332 can be prevented. In addition, since the insulating layer 354 can cover the active material layer 353 to protect the outer surface of the light emitting element 350, a reduction in light emitting efficiency can be prevented.

[0116] In some exemplary embodiments, the insulating layer 354 may be surface treated so that it is dispersed in the solution without being aggregated with other insulating material layers. During the process of aligning the light emitting element 350 to be described below, the light emitting element 350 remains dispersed in the solution to be independently aligned between the first electrode 331 and the second electrode 332. For example, the surface of the insulating layer 354 may be treated to be hydrophobic or hydrophilic so that it can remain dispersed in the solution.

[0117] The thickness of the insulating layer 354 may be in the range of 0.5 μm to 1.5 μm, but is not limited thereto.

[0118] The light emitting element 350 may be cylindrical. It will be appreciated that the shape of the light emitting element 350 is not limited thereto, but may have various shapes such as a cube, a cuboid, and a hexagonal column. The length l of the light emitting element 350 may be in the range of 1 μm to 10 μm, or in the range of 2 μm to 5 μm, and is preferably about 4 μm. The diameter of the light emitting element 350 may be in the range of 400 nm to 700 nm, and is preferably about 500 nm.

[0119] Reference Figure 6 and Figure 7 The light emitting elements 350 ′ and 350 ″ may further include at least one of electrode material layers 356 and 357 , which are located on at least one of the two side surfaces on which the first semiconductor layer 351 and the second semiconductor layer 352 are disposed.

[0120] exist Figure 6 In the example shown in , the light emitting element 350' further includes a second electrode material layer 357 only on the second semiconductor layer 352. Figure 7 In the example shown in , the light emitting element 350" further includes electrode material layers 356 and 357 on the first semiconductor layer 351 and the second semiconductor layer 352, respectively. For convenience of explanation, the electrode material layer formed on the side on which the first semiconductor layer 351 is disposed is referred to as the first electrode material layer 356, and the electrode material layer formed on the other side on which the second semiconductor layer 352 is disposed is referred to as the second electrode material layer 357. However, it will be understood that the present disclosure is not limited thereto. Any of the electrode material layers may be referred to as the first electrode material layer.

[0121] According to an exemplary embodiment of the present disclosure, the light emitting elements 350' and 350" may include at least one of the first electrode material layer 356 and the second electrode material layer 357, and the insulating layer 354 may extend in the longitudinal direction to cover the first electrode material layer 356 and the second electrode material layer 357. However, it will be understood that the present disclosure is not limited thereto. The insulating layer 354 may cover only the first semiconductor layer 351, the active material layer 353, and the second semiconductor layer 352, or may cover only a portion of the outer surface of each of the electrode material layers 356 and 357, so that another portion of the outer surface of each of the first electrode material layer 356 and the second electrode material layer 357 may be exposed.

[0122] The first electrode material layer 356 and the second electrode material layer 357 may be ohmic contact electrodes. However, it will be understood that the present disclosure is not limited thereto. The electrode material layer may be a Schottky contact electrode. The first electrode material layer 356 and the second electrode material layer 357 may include a conductive metal. For example, the first electrode material layer 356 and the second electrode material layer 357 may include at least one of aluminum (Al), titanium (Ti), indium (In), gold (Au), and silver (Ag). The first electrode material layer 356 and the second electrode material layer 357 may include the same material or different materials. However, it will be understood that the present disclosure is not limited thereto.

[0123] Refer to Figure 3 , the light emitting element 350 described above may be disposed in a space between the first electrode 331 and the second electrode 332 spaced apart from each other. The light emitting element 350 may be disposed in the space by a dielectrophoresis (DEP) technique. Figures 8 to 10 A method of aligning the light emitting element 350 will be described.

[0124] Figures 8 to 10 is a view illustrating a method of aligning a light emitting element according to an exemplary embodiment of the present disclosure.

[0125] First refer to Figure 8 , a solvent S containing a plurality of light-emitting elements 350 is loaded above the light-emitting unit 300, and the light-emitting elements 350 can be transferred to the first electrode 331 and the second electrode 332. The solvent S may have a composition such as ink and paste, and may be one or more of acetone, water, alcohol, and toluene. However, it will be understood that the present disclosure is not limited thereto. The solvent S is not particularly limited as long as it can be evaporated at room temperature or by heating.

[0126] Once the light emitting element 350 is transferred to the light emitting unit 300, the light emitting element 350 is aligned using a dielectrophoresis (DEP) technique.

[0127] Specifically, refer to Fig. 9 , a power supply voltage from a voltage source V may be applied to the first electrode 331 and the second electrode 332, thereby forming an electric field E between the first electrode 331 and the second electrode 332. The voltage source V may be an external source, or a voltage source within the display device 10. The voltage source V may be an AC voltage source having a predetermined amplitude and period, or may be a DC voltage source. By repeatedly applying a voltage to the first electrode 331 and the second electrode 332, a voltage source having a predetermined amplitude and period may be implemented using a DC voltage source.

[0128] When a voltage is applied to the first electrode 331 and the second electrode 332, a potential difference is generated due to the electrical polarity imparted to the first electrode 331 and the second electrode 332, and thus an electric field E is formed. Under the non-uniform electric field E, bipolarity is induced in the light emitting element 350, and the light emitting element 350 receives a force with a greater inclination or a less inclination toward the electric field E by a dielectrophoretic force (DEP force). The light emitting element 350 can be self-aligned between the first electrode 331 and the second electrode 332 by the DEP force.

[0129] After aligning the light emitting element 350, the solvent S is evaporated and removed at room temperature or by heating. As a result, Fig.10 As shown in , the light emitting element 350 may be disposed between the first electrode 331 and the second electrode 332. Figure 2 and Figure 3 As shown in , a first contact electrode 361 , a second contact electrode 362 , and a plurality of insulating material layers 370 are formed to form the light emitting unit 300 .

[0130] The solvent S may include at least one light emitting element 350. In order to align the light emitting element 350 emitting light of different colors in each of the pixel areas PXa of the light emitting unit 300, the solvent S may contain the light emitting element 350 emitting light of multiple colors. In addition, the light emitting element 350 emitting light of different colors may be mixed in the solvent S. However, it will be understood that the present disclosure is not limited thereto.

[0131] Return to reference Figure 1 , the display device 10 may include a color conversion unit 500. The color conversion unit 500 may include a color conversion layer 520 that converts light having a specific wavelength band provided from the light emitting unit 300 into light having a different wavelength band. Hereinafter, the color conversion unit 500 will be described in detail.

[0132] Fig.11 is a cross-sectional view of a color conversion unit according to an exemplary embodiment of the present disclosure. Fig.11In the color conversion unit 500, a support substrate 510 of the color conversion unit 500 is provided, and a color conversion layer 520 is provided on the support substrate 510. That is, by Fig.11 The color conversion unit 500 is connected to the light emitting unit 300 so that the support substrate 510 faces the upper side to achieve Figure 1 The display device 10 shown in FIG.

[0133] Reference Figure 1 and Fig.11 , a color conversion unit 500 according to an exemplary embodiment of the present disclosure may include a support substrate 510 , a color conversion layer 520 , a color filter layer 550 , a light blocking member BM, and a planarization layer OC.

[0134] The support substrate 510 may support the color filter layer 550, the color conversion layer 520, and the light blocking member BM located thereon. Figure 1 As shown in , the support substrate 510 may allow light provided from the light emitting unit 300 under the support substrate 510 to be emitted to the outside of the display device 10 .

[0135] The support substrate 510 may be a transparent insulating substrate. For example, the support substrate 510 may include, but is not limited to, a glass material, a quartz material, or a translucent plastic material.

[0136] The light blocking member BM is disposed on the support substrate 510. The light blocking member BM may substantially block the transmission of light provided from the light emitting unit 300. Thus, mixing of light emitted from the plurality of pixel layers PXb may be prevented to improve a color gamut, etc. The light blocking member BM may be disposed in a predetermined pattern. For example, the light blocking member BM may have a lattice pattern surrounding the plurality of pixel layers PXb.

[0137] The light blocking member BM may include a material having a high absorptivity to visible light. For example, the light blocking member BM may include, but is not limited to, a metal such as chromium, a metal nitride, a metal oxide, or a resin material colored in black.

[0138] The color conversion layer 520 may convert light incident from the light emitting unit 300 into light of a different color. For example, when blue light L3 is incident from the light emitting unit 300, the color conversion layer 520 may convert the blue light L3 into green light L2. However, it will be understood that the present disclosure is not limited thereto.

[0139] The color conversion layer 520 may be disposed between the light blocking member BM to be spaced apart from the support substrate 510. However, it will be understood that the present disclosure is not limited thereto. A portion of the color conversion layer 520 may be disposed on the light blocking member BM so as to overlap at least a portion of the light blocking member BM. The color conversion unit 500 may include a plurality of color conversion layers 520. The color conversion layers 520 (e.g., a first color conversion layer 521, a second color conversion layer 522, and a third color conversion layer 523) may be disposed in the pixel layer PXb, respectively, to convert and emit light incident from the light emitting unit 300.

[0140] The color conversion layer 520 may include color conversion particles 530 that convert incident first light having a specific wavelength band into second light having a wavelength band different from that of the first light. According to an exemplary embodiment of the present disclosure, the color conversion particles 530 may be a quantum dot material or a phosphor material.

[0141] When the color conversion particles 530 are quantum dot materials, if the first light with a specific wavelength band is incident, the valence band (VB) electrons of the quantum dot material are excited to the conduction band (CB). Then, the electrons return to the valence band (VB) and can emit a second light with a converted wavelength band.

[0142] The quantum dot material may have a core-shell structure. The core may be a semiconductor nanocrystal material. Examples of the core of the quantum dot material may include, but are not limited to, silicon (Si) nanocrystals, II-VI compound nanocrystals, and III-V compound nanocrystals, etc. For example, the quantum dot material may include a core made of at least one of cadmium selenide (CdSe), cadmium telluride (CdTe), cadmium sulfide (CdS), and indium phosphide (InP), and a shell made of zinc sulfide (ZnS).

[0143] When the color conversion particles 530 are quantum dot materials, the particle size of the quantum dot material can be adjusted to control the wavelength of the emitted light. For example, the diameter of the quantum dot material can be about arrive And blue light can be incident to emit red light. In addition, the particle size of the quantum dot material can be about to And blue light may be incident to emit green light. However, it will be understood that the present disclosure is not limited thereto.

[0144] The color conversion particles 530 are not necessarily spherical quantum dot materials. In some implementations, the color conversion particles 530 may be phosphor materials, plate-shaped materials, rod-shaped materials, or perovskite quantum dot materials. The material of the color conversion particles 530 is not particularly limited herein as long as it can convert incident light having a specific wavelength into light having another wavelength. Hereinafter, an example in which the color conversion particles 530 are spherical quantum dot materials will be described.

[0145] The color conversion particles 530 may be dispersed in the light-transmitting resin R. The light-transmitting resin R is not particularly limited as long as it does not absorb light incident on the color conversion layer 520 and does not affect the absorption and emission of light by the color conversion particles 530. For example, the light-transmitting resin R may include, but is not limited to, organic materials such as epoxy-based resins and acrylic-based resins.

[0146] Color conversion layer 520 including color conversion particles 530 may be formed, for example, by a variety of different processes such as inkjet injection or photoresist (PR).

[0147] When light having one wavelength is incident on the color conversion particles 530 and then emitted after converting its wavelength, it has scattering characteristics, that is, it is emitted in random directions (Lambertian emission). Therefore, the color conversion layer 520 including such color conversion particles 530 can make the light emitted from the front surface and the side surface have uniform brightness even in the absence of additional scatterers. It will be understood that the color conversion layer 520 may also include additional scatterers (not shown) to improve the light conversion efficiency. The materials of the scatterers are not particularly limited as long as they can scatter light uniformly. For example, the scatterers may be materials such as SiO 2 、TiO 2 、ZrO 2 、Al 2 O 3 、In 2 O 3 、ZnO、SnO 2 , Sb 2 O 3 and ITO nanoparticles.

[0148] As described above, the color conversion layer 520 including the color conversion particles 530 may emit light having a specific wavelength band. Depending on the light emitted by the pixel layer PXb, the color conversion layer 520 may include a plurality of types of color conversion particles 530. For example, when the blue light L3 is incident from the light emitting unit 300, the first color conversion layer 521 may include the color conversion particles 530 that convert the blue light L3 into the red light L1, and the second color conversion layer 522 may include the color conversion particles 530 that convert the blue light L3 into the green light L2. Therefore, in order to form a plurality of color conversion layers 520 including different color conversion particles 530, the same process must be repeated several times. In contrast, since the display device 10 according to the exemplary embodiment of the present disclosure includes only the same type of color conversion particles 530 (for example, only the color conversion particles 530 that emit the green light L2), the number of processes for forming the color conversion layer 520 may be reduced. A detailed description thereof will be given later.

[0149] Reference Fig.11 , the color filter layer 550 may be disposed between the color conversion layer 520 and the support substrate 510. The color filter layer 550 may determine the color of light incident from the light emitting unit 300 and passing through the color conversion layer 520 to be finally displayed on the pixel PX of the display device 10.

[0150] The color filter layer 550 may be used as a colored transmission layer that transmits incident light as it is. However, it will be understood that the present disclosure is not limited thereto. The color filter layer 550 may be a color filter or a wavelength selective optical filter that transmits a first light having a wavelength while blocking or reflecting a second light, a third light, etc. having other wavelengths.

[0151] The color filter layer 550 may include a transparent organic layer and serve as a colored transmission layer that transmits incident light as it is. In addition, in order to improve the color purity of the transmitted light, the color filter layer 550 may include a colorant having a color in a specific wavelength band. The colorant may be dispersed in the transparent organic layer of the color filter layer 550. However, it will be understood that the present disclosure is not limited thereto.

[0152] like Fig.11 As shown in , the color filter layer 550 may include a first color filter layer 551, a second color filter layer 552, and a third color filter layer 553. The color filter layer 550 may be disposed in the pixel layers PXb1, PXb2, and PXb3, respectively. Light of different colors may be incident on the color conversion layer 520 from the pixel regions PXa1, PXa2, and PXa3 of the light emitting unit 300. Therefore, the color filter layer 550 may be selectively disposed in the pixel layers PXb1, PXb2, and PXb3 to control the colors presented by the pixels PX1, PX2, and PX3 of the display device 10.

[0153] For example, the first color filter layer 551 may be disposed in the first pixel layer PXb1 and may serve as a colored transmission layer that transmits incident light as is. The second color filter layer 552 and the third color filter layer 553 may be disposed in the second pixel layer PXb2 and the third pixel layer PXb3, respectively, so as to transmit only light having a specific wavelength band and block or reflect other light. However, it will be understood that the present disclosure is not limited to this. The first color filter layer 551, the second color filter layer 552, and the third color filter layer 553 may all be used as color filters. This may be selectively adjusted according to the configuration of the light-emitting element 350 disposed in the light-emitting unit 300, which will be described later. According to an exemplary embodiment of the present disclosure, the display device 10 may include a first color filter layer 551, a second color filter layer 552, and a third color filter layer 553, wherein the first color filter layer 551 is a colored light transmission layer that transmits red light L1, the second color filter layer 552 is a color filter that transmits green light L2, and the third color filter layer 553 is a color filter that transmits blue light L3. This will be described in detail below.

[0154] Color conversion unit 500 may further include a low refractive index layer (not shown) disposed around the outer surface of color conversion layer 520. The low refractive index layer may have a lower refractive index than color conversion layer 520 and color filter layer 550, and may totally reflect light having a specific wavelength band incident from color conversion layer 520 or color filter layer 550. The totally reflected light may be recycled in color conversion layer 520, thereby improving light conversion efficiency.

[0155] The capping layer CL may be disposed on the outer surface of the color conversion layer 520 to cover and protect the color conversion particles 530 or the light-transmitting resin R. Fig.11 An example is shown in which the capping layer CL is disposed on the surface of the color conversion layer 520 opposite to the surface contacting the color filter layer 550. However, it will be understood that the present disclosure is not limited thereto. The capping layer CL may be disposed on the side surface of the color conversion layer 520, or between the color filter layer 550 and the color conversion layer 520. Fig.11 In the example shown in , a single capping layer CL is provided to cover all of first color conversion layer 521, second color conversion layer 522, and third color conversion layer 523. However, a plurality of capping layers CL may be provided to cover color conversion layers 521, 522, and 523, respectively.

[0156] The capping layer CL may include an inorganic material. For example, the capping layer CL may include, but is not limited to, silicon oxide (SiO x ), silicon nitride (SiN x ) and silicon oxynitride (SiO x N yWhen the above-mentioned low refractive index layer is provided on the outer surface of the color conversion layer 520, the capping layer CL may be omitted.

[0157] The planarization layer OC may be disposed over the color conversion layer 520, the color filter layer 550, the light blocking member BM, and the like. The planarization layer OC may be disposed to cover all elements disposed on the support substrate 510. Thus, the planarization layer OC may provide a flat upper surface of the color conversion unit 500 to reduce a level difference generated by elements disposed on the support substrate 510. Since the upper surface of the color conversion unit 500 becomes flat by the planarization layer OC, it may be attached to the light emitting unit 300 formed by a separate process to manufacture the display device 10, as will be described later.

[0158] The planarization layer OC may include an organic material. For example, the planarization layer OC may include a thermosetting resin. For example, the planarization layer OC may include, but is not limited to, at least one selected from the group consisting of a carbon-based resin, a polyimide-based resin, an acrylic-based resin, a siloxane-based resin, and a silsesquioxane-based resin.

[0159] When the color conversion unit 500 and the light emitting unit 300 are formed by different processes, the color conversion unit 500 and the light emitting unit 300 may be attached together by the adhesive layer PSA. Figure 1 As shown in , the adhesive layer PSA is disposed on the upper surface of the light emitting unit 300 and the flat surface of the flattening layer OC of the color conversion unit 500 , so that the light emitting unit 300 can be coupled with the color conversion unit 500 .

[0160] The type of the adhesive layer PSA is not particularly limited herein as long as it can couple elements to each other. For example, the adhesive layer PSA may be made of an optically clear adhesive (OCA), an optically clear resin (OCR), or a pressure-sensitive adhesive (PSA).

[0161] Return to reference Figure 1 , the display device 10 may include a first light emitting element 350_1 that emits red light L1, a second light emitting element 350_2 that emits blue light L3, and color conversion particles 530 that convert the blue light L3 into green light L2.

[0162] Specifically, the first light emitting element 350_1 emitting red light L1 may be disposed in the first pixel region PXa1 of the light emitting unit 300, and the second light emitting element 350_2 emitting blue light L3 may be disposed in each of the second pixel region PXa2 and the third pixel region PXa3. In addition, the first color conversion layer 521, the second color conversion layer 522, and the third color conversion layer 523 of the color conversion unit 500 may include color conversion particles 530 that convert the incident blue light L3 into green light L2.

[0163] When the display device 10 displays light having a specific wavelength band (e.g., red light L1, green light L2, and blue light L3), different light-emitting elements 350 emitting light of different colors may be used. In this case, the manufacture of the display device 10 requires three light-emitting elements 350 that emit red light L1, green light L2, and blue light L3, respectively. Therefore, the dielectrophoresis (DEP) technique for arranging the light-emitting element 350 between the first electrode 331 and the second electrode 332 must be performed three times, and an additional process for forming the light-emitting element 350 is added. The process of manufacturing or arranging the light-emitting element 350 requires a series of steps to be repeatedly performed. As a result, the process cost may be increased, and the yield may be reduced. It is known in the art that the light-emitting element 350 emitting green light L2 has a lower luminous efficiency than the light-emitting element 350 emitting blue light L3 due to the properties of the material.

[0164] For this reason, previously, red light L1, green light L2, and blue light L3 were presented by using one type of light emitting element 350 that emits blue light L3, which exhibits excellent light emitting efficiency, and by using color conversion unit 500. However, in order to convert blue light L3 into red light L1 and green light L2, a process of forming color conversion layer 520 including different color conversion particles 530 is required. The process of forming color conversion layer 520 also requires a series of steps to be repeatedly performed.

[0165] In contrast, according to an exemplary embodiment of the present disclosure, the display device 10 includes a first light emitting element 350_1 that emits red light L1 and a second light emitting element 350_2 that emits blue light L3. In addition, the display device 10 includes a color conversion layer 520 that includes the same type of color conversion particles 530 (e.g., color conversion particles 530 that allow green light L2 to be emitted). In this way, the number of processes that are repeatedly performed can be reduced. In addition, since the green light L2 having low luminous efficiency due to the nature of the material is converted from the blue light L3, the luminous efficiency of the green light L2 can be improved.

[0166] like Figure 1As shown in , in the display device 10 according to the exemplary embodiment of the present disclosure, the first pixel area PXa1 includes a first light emitting element 350_1 for emitting red light L1, and each of the second pixel area PXa2 and the third pixel area PXa3 includes a second light emitting element 350_2 for emitting blue light L3. The red light L1 emitted from the first pixel area PXa1 is incident on the first color conversion layer 521, and then on the first color filter layer 551. Since the color conversion particles 530 included in the first color conversion layer 521 absorb the blue light L3 to convert it into green light L2, the incident red light L1 is not converted but is incident on the first color filter layer 551 as it is. The first color filter layer 551 transmits only the red light L1 and blocks the transmission of light of other colors. Therefore, the red light L1 is emitted from the first pixel PX1.

[0167] Blue light L3 is emitted from the second pixel region PXa2 and the third pixel region PXa3, and is incident on the second color conversion layer 522 and the third color conversion layer 523, respectively. The blue light L3 is incident on the color conversion particles 530 of each of the second color conversion layer 522 and the third color conversion layer 523, and some of them are emitted as green light L2. Therefore, mixed light of the blue light L3 and the green light L2 is incident on each of the second color filter layer 552 and the third color filter layer 553.

[0168] The second color filter layer 552 transmits green light L2 and blocks the transmission of light of other colors. The third color filter layer 553 transmits blue light L3 and blocks the transmission of light of other colors. As a result, green light L2 is emitted from the second pixel PX2, and blue light L3 is emitted from the third pixel PX3.

[0169] As described above, the luminous efficiency of the green light L2 is lower than the luminous efficiency of the blue light L3. In the display device 10 according to the exemplary embodiment of the present disclosure, the green light L2 as well as the blue light L3 are incident on the second color filter layer 552 from the second color conversion layer 522 of the second pixel layer PXb2. When the amount of the blue light L3 incident on the second color conversion layer 522 from the second light emitting element 350_2 is constant, as the amount of the green light L2 converted by the color conversion particles 530 increases, the amount of the green light L2 transmitting the second color filter layer 552 may increase. In an exemplary embodiment, in the display device 10, the second color conversion layer 522 may include more color conversion particles 530 than the first color conversion layer 521 and the third color conversion layer 523. In the process of forming the color conversion layer 520, the color conversion particle ink 531 (see Fig.18As the amount of color conversion particles 530 included in the second color conversion layer 522 increases, the green light L2 converted from the blue light L3 by the color conversion particles 530 can increase. Therefore, the change in the color coordinates of the green light L2 incident on the second color filter layer 552 from the second color conversion layer 522 and emitted to the outside of the display device 10 can be suppressed.

[0170] Hereinafter, a process of forming the light emitting unit 300 and the color conversion unit 500 of the display device 10 according to an exemplary embodiment will be described. Figures 12 to 20 Give a description.

[0171] Figure 12 to Figure 14 3 is a schematic diagram showing a process of forming a light emitting unit including a first light emitting element and a second light emitting element according to an exemplary embodiment of the present disclosure. The light emitting unit 300 includes an area defined by a first pixel region PXa1, a second pixel region PXa2, and a third pixel region PXa3, and adjacent pixel regions PXa may be separated by a first partition wall 380. After loading the light emitting element 350, the light emitting unit 300 may be formed as described above with reference to FIG. Figures 8 to 10 It is described that the light emitting element 350 is aligned by the electric field E. In the following, the description will be focused on the differences.

[0172] The light emitting unit 300 may be formed by performing a process of aligning the first light emitting element 350_1 once through the dielectrophoresis (DEP) technique and performing a process of aligning the second light emitting element 350_2 once through the dielectrophoresis (DEP) technique. As a result, the number of processes of repeatedly performing the dielectrophoresis (DEP) technique may be reduced compared to the number of processes of manufacturing the light emitting unit 300 by aligning the light emitting elements 350 emitting red light L1, green light L2, and blue light L3, respectively.

[0173] First, refer to Fig.12 , a first light emitting element 350_1 emitting a first color light L1 is loaded in the first pixel region PXa1, and a power supply voltage is applied between the first electrode 331 and the second electrode 332 to align the first light emitting element 350_1. The power supply voltage is applied only to the first pixel region PXa1 to form an electric field E between the first electrode 331 and the second electrode 332. Thus, the first partition wall 380 of the light emitting unit 300 can prevent the first light emitting element 350_1 from moving to the second pixel region PXa2 or the third pixel region PXa3.

[0174] Then, refer to Fig.13, a second light emitting element 350_2 emitting blue light L3 is loaded in each of the second pixel region PXa2 and the third pixel region PXa3, and a power supply voltage is applied between the first electrode 331 and the second electrode 332 to align the second light emitting element 350_2. A power supply voltage is applied to the second pixel region PXa2 and the third pixel region PXa3. The first partition wall 380 of the light emitting unit 300 may prevent the second light emitting element 350_2 from moving to the first pixel region PXa1. However, since the same second light emitting element 350_2 is provided in the second pixel region PXa2 and the third pixel region PXa3, in some implementations, the first partition wall 380 between the second pixel region PXa2 and the third pixel region PXa3 may be omitted.

[0175] Subsequently, when the solvent S containing the first light emitting element 350_1 and the second light emitting element 350_2 is dried or evaporated by heating, the first light emitting element 350_1 and the second light emitting element 350_2 may be disposed between the first electrode 331 and the second electrode 332. Fig.14 , the first light emitting element 350_1 is disposed in the first pixel region PXa1, and the second light emitting element 350_2 is disposed in each of the second pixel region PXa2 and the third pixel region PXa3. Once the first light emitting element 350_1 and the second light emitting element 350_2 are disposed between the first electrode 331 and the second electrode 332, contact electrodes 361 and 362 and a plurality of insulating material layers 370 are stacked on the first electrode 331 and the second electrode 332 to form the light emitting unit 300. As will be described later, the light emitting unit 300 is attached to the color conversion unit 500 by the adhesive layer PSA, and a planarization layer may be provided to provide a planar upper surface of the light emitting unit 300. However, it will be understood that the present disclosure is not limited thereto.

[0176] Subsequently, a method of forming the color conversion unit 500 including the same color conversion particles 530 will be described The color conversion unit 500 may be formed by sequentially stacking elements such as a light blocking member BM, a plurality of color filter layers 550, and a color conversion layer 520 on a support substrate 510.

[0177] Figures 15 to 20 is a schematic diagram illustrating a method of forming a color conversion unit according to an exemplary embodiment of the present disclosure.

[0178] First, if Fig.15As shown in FIG. 5 , a support substrate 510 supporting a plurality of elements included in the color conversion unit 500 is prepared. Before various elements are formed on the support substrate 510, a cleaning process is performed to remove impurities or dust adhering to the support substrate 510. As described above, the support substrate 510 may include a region defined by a first pixel layer PXb1, a second pixel layer PXb2, and a third pixel layer PXb3, and adjacent pixel layers PXb may be separated by a light blocking member BM, which will be described later.

[0179] Then, refer to Fig.16 , a light blocking member BM is formed on the support substrate 510. The configurations such as the structure and the material of the support substrate 510 and the light blocking member BM have been described above.

[0180] Then, refer to Fig.17 , a color filter layer 550 is formed on a support substrate 510 on which a light blocking member BM is disposed. The color filter layer 550 is disposed on the support substrate 510 and is disposed between the light blocking members BM spaced apart from each other. For example, a first color filter layer 551, a second color filter layer 552, and a third color filter layer 553 are formed in a first pixel layer PXb1, a second pixel layer PXb2, and a third pixel layer PXb3, respectively. However, it will be understood that the present disclosure is not limited thereto.

[0181] According to an exemplary embodiment of the present disclosure, the first color filter layer 551, the second color filter layer 552, and the third color filter layer 553 disposed on the support substrate 510 can transmit red light L1, green light L2, and blue light L3, respectively, and can block the transmission of light of other colors. As described above, each of the first color filter layer 551, the second color filter layer 552, and the third color filter layer 553 can be used as a colored transmission layer or a color filter that transmits only specific light. Therefore, the pixel PX of the display device 10 can emit light of different colors when light is transmitted through the color filter layer 550 of the support substrate 510.

[0182] The color filter layer 550 may be formed by patterning through an optical process using a photosensitive organic material or an inkjet process. However, it will be understood that the present disclosure is not limited thereto.

[0183] Then, refer to Fig.18 and Fig.19, a color conversion particle ink 531 containing color conversion particles 530 is loaded on each of the color filter layers 550 disposed between the light blocking members BM, and the color conversion particle ink 531 is dried and cured to form the color conversion layer 520. As described above, although the type of the color conversion particles 530 is not particularly limited, such as a quantum dot material or a rod-shaped material, it will be noted that the same color conversion particles 530 are loaded on the color filter layer 550. According to an exemplary embodiment of the present disclosure, the color conversion particles 530 may include a quantum dot material that emits green light L2 when blue light L3 is incident. Therefore, when red light L1 is incident on the color conversion particles 530, the color conversion particles 530 do not absorb the red light L1, and thus the red light L1 is transmitted as it is. When blue light L3 is incident, the color conversion particles 530 absorb the blue light L3 and emit green light L2.

[0184] like Fig.18 and Fig.19 As shown in , the color conversion particle ink 531 loaded on the color filter layer 550 cannot move from around the light blocking member BM to the adjacent pixel layer PXb. The light blocking member BM can prevent the color conversion particle ink 531 from mixing between the pixel layers PXb. It will be noted that since the color conversion unit 500 includes the same type of color conversion particles 530, the loading of the color conversion particle ink 531 can be performed across the pixel layer PXb. That is, the color conversion particle ink 531 is not limited to a specific pixel layer PXb, but can be loaded on the entire support substrate 510. Therefore, the process of loading the color conversion particles 530 can be performed only once during the process of forming the color conversion unit 500. Therefore, it is not necessary to perform three inkjet processes to load different color conversion particles 530 to different pixels PX, and thus the process cost and yield can be improved. In addition, even if the ink loaded in each of the pixels PX overflows to another adjacent pixel PX, color mixing will not be performed, so that the defect rate can be reduced.

[0185] Finally, if Fig. 20 As shown in FIG. 5 , a planarization layer OC may be formed over the color conversion layer 520 to provide a flat surface of the color conversion unit 500. An adhesive layer PSA for combining with the light emitting unit 300 is formed on the planarization layer OC.

[0186] The light emitting unit 300 and the color conversion unit 500 thus formed may be attached together by an adhesive layer PSA to manufacture Figure 1The display device 10 of FIG. 10. The first pixel region PXa1 in which the first light emitting element 350_1 is formed overlaps the first pixel layer PXb1 in which the first color filter layer 551 is formed. The red light L1 emitted from the first light emitting element 350_1 is not converted by the first color conversion layer 521, but may be transmitted through the first color filter layer 551 as it is, so that the red light L1 may be displayed to the outside of the display device 10.

[0187] In addition, the second pixel region PXa2 and the third pixel region PXa3 in which the second light emitting element 350_2 is disposed overlap respectively with the second pixel layer PXb2 in which the second color filter layer 552 is formed and the third pixel layer PXb3 in which the third color filter layer 553 is formed. Some of the blue light L3 emitted from the second light emitting element 350_2 may be converted into green light L2 in the second color conversion layer 522 and the third color conversion layer 523. It will be noted that the light presented to the outside of the display device 10 by the second color filter layer 552 and the third color filter layer 553 is green light L2 and blue light L3, respectively.

[0188] Therefore, in this way Figure 1 In the display device 10, red light L1 may be emitted from the first pixel PX1, green light L2 may be emitted from the second pixel PX2, and blue light L3 may be emitted from the third pixel PX3. Since the blue light L3 provided from the second light emitting element 350_2 is converted into green light L2 and displayed as green light L2, the light emitting efficiency of the green light L2 may be improved. In addition, compared with the existing display device having the same configuration, the number of processes required for manufacturing may be reduced, thereby reducing process costs and improving manufacturing yield.

[0189] Furthermore, to further improve the luminous efficiency of green light L2 , the density of color conversion particles 530 in second color conversion layer 522 may be higher than the density of color conversion particles 530 in first color conversion layer 521 or third color conversion layer 523 .

[0190] Not all of the blue light L3 incident on the second color conversion layer 522 can be converted into the green light L2. The greater the content of the color conversion particles 530, the more blue light L3 can be absorbed, and the more green light L2 can be emitted. Specifically, when the second color conversion layer 522 includes a larger amount of color conversion particles 530 than the third color conversion layer 523, the amount of green light L2 incident on the second color filter layer 552 can be greater than the amount of green light L2 incident on the third color filter layer 553. Even with the second light emitting element 350_2 emitting the same blue light L3, the amount of green light L2 can be controlled according to the content of the color conversion particles 530. Therefore, even if the mixed light of the blue light L3 and the green light L2 is incident on the second color filter layer 552, only the pure green light L2 can be emitted and the color coordinate change can be suppressed.

[0191] Hereinafter, display devices according to other exemplary embodiments of the present disclosure will be described.

[0192] Fig.21 is a cross-sectional view of a display device according to another exemplary embodiment of the present disclosure. Fig. 22 is a view showing that the color conversion particle ink containing color conversion particles is directly loaded in the light emitting unit.

[0193] Fig.21 2 shows an example of a display device 10' in which a color conversion unit 500_2 is directly formed on a light emitting unit 300_2. Figure 1 Unlike the display device 10 of FIG. 1 , the process of separately forming the light emitting unit 300_2 and the color conversion unit 500_2 and attaching them together is omitted. Therefore, the adhesive layer PSA and the planarization layer OC of the color conversion unit 500_2 may be omitted.

[0194] exist Fig.21 and Fig. 22 In the display device 10 ′, the color conversion particle ink 531_2 is directly loaded on the light emitting unit 300_2 including the first light emitting element 350_1 and the second light emitting element 350_2 to form the color conversion layer 520_2 .

[0195] Specifically, Fig. 22 As shown in , the color conversion particle ink 531_2 containing the color conversion particles 530 is directly loaded on the first pixel area PXa1, the second pixel area PXa2 and the third pixel area PXa3 of the light emitting unit 300_2. The first partition wall 380 can prevent the color conversion particle ink 531_2 from moving to another adjacent pixel area PXa like the light blocking member BM of the color conversion unit 500_2. However, since the color conversion particles 530 according to the exemplary embodiment include the same kind of material, the first partition wall 380 can be omitted in some implementations. After the color conversion particle ink 531_2 containing the color conversion particles 530 is loaded, the ink is dried or evaporated by heating to form a color conversion layer 520_2. The color filter layer 550_2, the light blocking member BM and the supporting substrate 510_2 are stacked on the color conversion layer 520_2, so that the display device 10' can be manufactured. In addition to the color conversion unit 500_2 being directly formed on the light emitting unit 300_2, Fig.21 The display device 10 ′ and Figure 1 The display device 10 of FIG. 1 is substantially the same as that of FIG. 1 . In the following, the description will be focused on the differences.

[0196] Because in Fig.21In the display device 10', the color conversion particles 530 are directly loaded on the light emitting unit 300_2, so the color conversion particles 530 can be arranged relatively close to the light emitting element 350. Figure 1 In the display device 10 of FIG. 5 , at least one planarization layer OC, an adhesive layer PSA, etc. are provided between the color conversion particles 530 and the light emitting element 350. Fig.21 In the display device 10 ′ of FIG. 5 , the color conversion particles 530 may be disposed directly on the light emitting element 350 , and may also be disposed on a side surface of the light emitting element 350 .

[0197] In addition, since the planarization layer OC can be omitted in the display device 10', the first partition wall 380 of the light emitting unit 300_2 can at least partially contact the light blocking member BM of the color conversion unit 500_2. Therefore, the first partition wall 380 can support the color conversion unit 500_2 disposed on the light emitting unit 300_2. In addition, the first partition wall 380 can separate the pixel areas PXa from each other together with the light blocking member BM, thereby preventing the colors of the light emitted from the light emitting element 350 from mixing. However, it will be understood that the present disclosure is not limited thereto.

[0198] Each of the pixel regions PXa of the light emitting unit 300_2 may include a plurality of light emitting elements 350, and the light emitting elements 350 may be spaced apart from each other. Although not shown in the drawings, the first electrode 331 and the second electrode 332 may extend in one direction in the light emitting unit 300_2 to be arranged in a straight line. That is, the region formed by the first electrode 331 being spaced apart from the second electrode 332 may also be a straight line. Therefore, the plurality of light emitting elements 350 disposed between the first electrode 331 and the second electrode 332 may have some empty spaces formed between the light emitting elements 350, and the color conversion particles 530 may be disposed directly in the empty spaces. In this case, even in the absence of any additional low refractive index layer, most of the light emitted from the light emitting element 350 may enter the color conversion particles 530. Therefore, light leakage may be reduced to further improve light conversion efficiency.

[0199] Furthermore, in the display device 10 ′ according to this exemplary embodiment, the first light emitting element 350_1 and the second light emitting element 350_2 may be disposed together in each of the pixel regions PXa of the light emitting unit 300_2 .

[0200] Fig.23 is a plan view illustrating a light emitting unit of a display device according to still another exemplary embodiment of the present disclosure. Fig.24 It is shown in Fig.23 FIG. 1 is a view of a process of aligning a light emitting element in a light emitting unit of a display device.

[0201] Reference Fig.23 and Fig.24 , different light emitting elements 350 may be arranged together in a single pixel region PXa. Fig.23 As shown in , the first light emitting element 350_1 emitting red light L1 and the second light emitting element 350_2 emitting blue light L3 may be disposed together in each of the pixel regions PXa. That is, in each of the pixel regions PXa, mixed light of the red light L1 and the blue light L3 may be incident on the corresponding color conversion layer 520. During the process of aligning the light emitting elements 350_1 and 350_2 between the first electrode 331 and the second electrode 332 spaced apart from each other, the color conversion particle ink 531_2 mixed with the first light emitting element 350_1 and the second light emitting element 350_2 may be loaded at once, and a voltage may be applied to all the pixel regions PXa, thereby aligning the first light emitting element 350_1 and the second light emitting element 350_2 together.

[0202] In the display device 10 according to the exemplary embodiment of the present disclosure, since the first light emitting element 350_1 and the second light emitting element 350_2 are disposed together in each of the pixel regions PXa, the red light L1 and the blue light L3 may be incident on the color conversion layer 520. That is, the first color conversion layer 521, the second color conversion layer 522, and the third color conversion layer 523 may allow the green light L2 converted by the color conversion particles 530 and the red light L1 and the blue light L3 incident from the light emitting unit 300 to be emitted. In this case, the first color filter layer 551, the second color filter layer 552, and the third color filter layer 553 all function as a color filter CF, so that the red light L1, the green light L2, and the blue light L3 may be emitted to the outside of the display device 10.

[0203] At the end of the detailed description, it will be appreciated by those skilled in the art that many changes and modifications may be made to the preferred embodiment without departing substantially from the principles of the invention. Therefore, the preferred embodiments of the present invention disclosed are used only in an overview and descriptive sense, and not for limiting purposes.

Claims

1. A display device, comprising a first pixel, a second pixel and a third pixel, wherein the display device comprises: Luminescent layer; A color conversion layer, disposed on the light-emitting layer; as well as a color filter layer, disposed on the color conversion layer, The light-emitting layer includes a first light-emitting element disposed in the first pixel, a second light-emitting element disposed in the second pixel, and a third light-emitting element disposed in the third pixel. The color conversion layer includes a first color conversion layer disposed in the first pixel, a second color conversion layer disposed in the second pixel, and a third color conversion layer disposed in the third pixel. The color filter layer includes a first color filter layer disposed in the first pixel, a second color filter layer disposed in the second pixel, and a third color filter layer disposed in the third pixel, The first light emitting element and the second light emitting element emit first light, the central wavelength range of the first light is a first wavelength, The first color conversion layer, the second color conversion layer, and the third color conversion layer contain color conversion particles that convert the first light into second light. The central wavelength range of the second light is a second wavelength longer than the first wavelength, The third light emitting element emits a third light, the central wavelength range of the third light is a third wavelength longer than the second wavelength, the first color filter layer transmits the first light and blocks transmission of the second light, the second color filter layer transmits the second light and blocks transmission of the first light, and The third color filter layer transmits the third light and blocks transmission of the first light and the second light.

2. The display device according to claim 1, wherein: The third color filter layer receives the third light.

3. The display device according to claim 2, wherein: The color conversion particles do not convert the third light.

4. The display device according to claim 1, wherein: Each of the first color filter layer and the second color filter layer receives mixed light of the first light and the second light.

5. The display device according to claim 1, wherein: The color conversion particles are dispersed in the first color conversion layer, the second color conversion layer, and the third color conversion layer, and wherein a density of the color conversion particles dispersed in the second color conversion layer is greater than a density of the color conversion particles in each of the first color conversion layer and the third color conversion layer.

6. The display device according to claim 5, wherein: An amount of the second light incident on the second color filter layer is greater than an amount of the second light incident on the first color filter layer.

7. The display device according to claim 6, wherein: The central wavelength of the first light is in the range of 430 nm to 470 nm, wherein the central wavelength of the second light is in the range of 530 nm to 570 nm, and The color conversion particles include quantum dot material.

8. The display device according to claim 1, wherein: At least a portion of the first color conversion layer overlaps with the first light emitting element, wherein at least a portion of the second color conversion layer overlaps with the second light-emitting element, At least a portion of the third color conversion layer overlaps with the third light emitting element, and The color conversion particles are disposed adjacent to at least one of the first light emitting element, the second light emitting element, and the third light emitting element.

9. The display device according to claim 8, wherein: The color conversion particles are disposed to overlap with a side surface of at least one side of the first light emitting element, the second light emitting element, and the third light emitting element.

10. The display device according to claim 1, wherein: The light emitting layer further includes a first partition wall disposed between the first light emitting element and the second light emitting element, and a second partition wall disposed between the second light emitting element and the third light emitting element.

11. The display device according to claim 10, wherein: At least a portion of the first light emitted from the second light emitting element and transmitted toward the first color conversion layer or the third color conversion layer is reflected off the first partition wall and the second partition wall to be incident on the second color conversion layer.

12. The display device according to claim 1, comprising: A first planarization layer is disposed on the light-emitting layer to cover the first light-emitting element, the second light-emitting element and the third light-emitting element; a second planarization layer disposed below the color conversion layer to provide a planar lower surface of the color conversion layer; as well as an adhesive layer disposed between the first planarization layer and the second planarization layer, The first planarization layer, the adhesive layer, and the second planarization layer are stacked on each other between the light emitting layer and the color conversion layer.

13. A display device, comprising a first pixel, a second pixel and a third pixel, wherein the display device comprises: Luminescent layer; A color conversion layer, disposed on the light-emitting layer; as well as a color filter layer, disposed on the color conversion layer, The light-emitting layer includes a first light-emitting element disposed in the first pixel, a second light-emitting element disposed in the second pixel, and a third light-emitting element disposed in the third pixel. The color conversion layer includes a first color conversion layer disposed in the first pixel, a second color conversion layer disposed in the second pixel, and a third color conversion layer disposed in the third pixel, The color filter layer includes a first color filter layer disposed in the first pixel, a second color filter layer disposed in the second pixel, and a third color filter layer disposed in the third pixel, The first light emitting element, the second light emitting element, and the third light emitting element emit mixed light of first light having a first wavelength and third light having a third wavelength, the third wavelength being longer than the first wavelength, The first color conversion layer, the second color conversion layer, and the third color conversion layer contain color conversion particles that convert the first light into second light having a second wavelength that is longer than the first wavelength and shorter than the third wavelength, The first color filter layer transmits the first light and blocks transmission of the second light and the third light, the second color filter layer transmits the second light and blocks transmission of the first light and the third light, and The third color filter layer transmits the third light and blocks transmission of the first light and the second light.

14. The display device according to claim 13, wherein: Mixed light of the first light and the second light is incident on each of the first color conversion layer, the second color conversion layer, and the third color conversion layer.

15. The display device according to claim 14, wherein: Mixed light of the first light, the second light, and the third light is incident on each of the first color filter layer, the second color filter layer, and the third color filter layer.

16. The display device according to claim 15, wherein: The color conversion particles are dispersed in the first color conversion layer, the second color conversion layer, and the third color conversion layer, and wherein a density of the color conversion particles dispersed in the second color conversion layer is greater than a density of the color conversion particles in each of the first color conversion layer and the third color conversion layer.

17. The display device according to claim 16, wherein: An amount of the second light incident on the second color filter layer is greater than an amount of the second light incident on the first color filter layer.

18. The display device according to claim 13, wherein: At least a portion of the first color conversion layer overlaps with the first light emitting element, wherein at least a portion of the second color conversion layer overlaps with the second light-emitting element, At least a portion of the third color conversion layer overlaps with the third light emitting element, and The color conversion particles are disposed adjacent to at least one of the first light emitting element, the second light emitting element, and the third light emitting element.

19. The display device according to claim 13, comprising: A first planarization layer, disposed on the light-emitting layer to cover the first light-emitting element, the second light-emitting element and the third light-emitting element; a second planarization layer disposed below the color conversion layer to provide a planar lower surface of the color conversion layer; as well as an adhesive layer disposed between the first planarization layer and the second planarization layer, The first planarization layer, the adhesive layer, and the second planarization layer are stacked on each other between the light emitting layer and the color conversion layer.

Images