Organic light emitting display apparatus

Abstract

The present application relates to an organic light emitting display apparatus, including: a first substrate; a second substrate opposite to the first substrate; a plurality of organic light emitting elements on the first substrate; and a color filter on the organic light emitting elements, wherein a transmission wavelength band of the color filter has an upper limit value for transmitting a light wavelength corresponding to a first intensity of light emitted from the organic light emitting elements at a viewing angle of about 0° and has a lower limit value for transmitting a light wavelength corresponding to a second intensity less than the first intensity.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2019-0021755, filed on February 25, 2019 with the Korean Intellectual Property Office (KIPO), the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This invention relates to organic light-emitting display devices. Background Technology

[0004] Typically, organic light-emitting display devices (e.g., organic light-emitting diode (OLED) display devices) are self-emissive displays in which organic compounds are electrically excited to emit light. Such OLED display devices can be driven with low voltage, are easily made thinner, and have wide viewing angles and fast response times. Therefore, OLED display devices have attracted attention as a next-generation display device that can solve the problems of liquid crystal display (LCD) devices.

[0005] In such organic light-emitting display devices, when external incident light (natural light) enters from the outside and is reflected by an internal reflector, the light emitted from the self-emissive element and the generated reflected light mix together. Therefore, the external light increases the black brightness, and consequently, the contrast ratio (CR) may decrease, potentially degrading the display quality. This is because when the amount of reflected light exceeds a certain level, the observer can perceive light with a wavelength band different from that achieved by the organic light-emitting display device, compared to the amount of light generated by the device.

[0006] Conventional organic light-emitting display devices include a polarization layer comprising a linear polarizer and a quarter-wave plate to suppress the reflection of external light. The component of external light incident on the organic light-emitting display device that oscillates along the transmission axis parallel to the linear polarizer passes through the linear polarizer, and the transmitted component is converted into circularly polarized light, which rotates in one direction as it passes through the quarter-wave plate.

[0007] When circularly polarized light is reflected by the metal layer of an organic light-emitting display device, it is converted into circularly polarized light rotating in the opposite direction. Furthermore, as it passes through a quarter-wave plate, it is converted into linearly polarized light. In this case, the oscillation direction of the linearly polarized light is orthogonal to the transmission axis of the linear polarizer, and therefore it cannot pass through the plate. Through this principle, the polarizing layer significantly reduces the reflection of external light and improves outdoor visibility.

[0008] However, not only is external light absorbed by the linear polarizer, but approximately half of the light emitted from the organic light-emitting display device is also absorbed by the linear polarizer, thus reducing luminous efficiency. Therefore, techniques for forming color filters have been proposed to replace this polarizing layer.

[0009] It should be understood that this background section is intended to provide useful background information for understanding the technology, and as disclosed herein, the background section may include ideas, concepts or knowledge of the subject matter disclosed herein that were not known or understood by a person skilled in the art prior to the corresponding actual application date. Summary of the Invention

[0010] Various aspects of the present invention relate to an organic light-emitting display device that includes a color filter instead of a conventional polarizer, wherein the transmission wavelength band of the color filter is extended toward a shorter wavelength to compensate for optical loss due to blue shift.

[0011] According to some embodiments of the present invention, an organic light-emitting display device is provided, comprising: a first substrate; a second substrate opposite to the first substrate; a plurality of organic light-emitting elements located on the first substrate; and a color filter located on the organic light-emitting elements, wherein the color filter has a transmission wavelength band having an upper limit value for transmitting a light wavelength corresponding to a first intensity of light emitted from the organic light-emitting elements at an angle of about 0° and a lower limit value for transmitting a light wavelength corresponding to a second intensity less than the first intensity.

[0012] In some implementations, the lower limit of the transmission wavelength band of the color filter is less than the lower limit of the light wavelength of the organic light-emitting element corresponding to the first intensity.

[0013] In some embodiments, the organic light-emitting element includes a red organic light-emitting element, a green organic light-emitting element, and a blue organic light-emitting element, wherein the color filter includes a first color filter located on the red organic light-emitting element, a second color filter located on the green organic light-emitting element, and a third color filter located on the blue organic light-emitting element, and wherein the lower limit values ​​of the transmission wavelength bands of the third color filter, the second color filter, and the first color filter are sequentially further away from the lower limit value of the wavelength corresponding to the first intensity of each corresponding organic light-emitting element.

[0014] In some embodiments, the organic light-emitting element includes a red organic light-emitting element, a green organic light-emitting element, and a blue organic light-emitting element, and the second intensity decreases in the order of red organic light-emitting element, green organic light-emitting element, and blue organic light-emitting element.

[0015] In some embodiments, the first color filter has a transmission wavelength band for transmitting a wavelength, wherein the intensity of light emitted from the green organic light-emitting element at that wavelength at any viewing angle of about 60° or less is substantially the same as the intensity of light emitted from the red organic light-emitting element at that wavelength.

[0016] In some embodiments, the first color filter has a transmission wavelength band that does not transmit light at the peak intensity of the light emitted from the green organic light-emitting element at an angle of about 60°.

[0017] In some embodiments, the second color filter has a transmission wavelength band for transmitting a wavelength, wherein the intensity of light emitted from the blue organic light-emitting element at that wavelength at any viewing angle of about 60° or less is substantially the same as the intensity of light emitted from the green organic light-emitting element at that wavelength.

[0018] In some embodiments, the second color filter has a transmission wavelength band that does not transmit light at the peak intensity of the light emitted from the blue organic light-emitting element at a viewing angle of about 60°.

[0019] In some embodiments, the third color filter has a transmission wavelength band that corresponds to the peak point of the intensity of light emitted from the blue organic light-emitting element at a viewing angle of about 0° to about 60°.

[0020] In some implementations, the upper limit of the transmission wavelength band of the third color filter is greater than the wavelength at the intersection where the intensity of light emitted from the blue organic light-emitting element is substantially the same as the intensity of light emitted from the green organic light-emitting element at an angle of about 0°.

[0021] In some embodiments, the lower limit of the transmission wavelength band of the first color filter is about 515 nm to about 545 nm.

[0022] In some embodiments, the first color filter has a transmission wavelength band of about 515 nm to about 690 nm, the second color filter has a transmission wavelength band of about 460 nm to about 600 nm, and the third color filter has a transmission wavelength band of about 430 nm to about 515 nm.

[0023] In some embodiments, the lower limit of the transmission wavelength band of the second color filter is about 460 nm to about 480 nm.

[0024] In some implementations, the upper limit of the transmission wavelength band of the third color filter is about 515 nm to about 530 nm.

[0025] According to some embodiments of the present invention, an organic light-emitting display device is provided, comprising: a first substrate; a second substrate opposite to the first substrate; a plurality of organic light-emitting elements located on the first substrate; a color filter located on the organic light-emitting elements; and a black matrix adjacent to the color filter, wherein the color filter includes a first color filter, a second color filter, and a third color filter, and wherein the end portions of the black matrix adjacent to the first color filter, the second color filter, and the third color filter have different taper angles from each other.

[0026] In some embodiments, the end portion of the black matrix adjacent to the first color filter has a first tilt angle, and the end portion of the black matrix adjacent to the second color filter has a second tilt angle greater than the first tilt angle.

[0027] In some implementations, the end portion of the black matrix adjacent to the third color filter has a third tilt angle greater than the second tilt angle.

[0028] In some implementations, the separation distance between the first color filter and the end portion of the black matrix adjacent to the first color filter is greater than the separation distance between any of the second and third color filters and the end portion of the black matrix adjacent to said color filter.

[0029] In some embodiments, the organic light-emitting element includes a red organic light-emitting element, a green organic light-emitting element, and a blue organic light-emitting element, and the first color filter has a transmission wavelength band for transmitting a wavelength, wherein the intensity of light emitted from the green organic light-emitting element at that wavelength at any viewing angle of about 60° or less is substantially the same as the intensity of light emitted from the red organic light-emitting element at that wavelength.

[0030] In some embodiments, the first color filter has a transmission wavelength band that does not transmit wavelengths corresponding to the peak point of the intensity of light emitted from the green organic light-emitting element at any viewing angle of about 60° or less.

[0031] In some embodiments, the first color filter has a transmission wavelength band of about 515 nm to about 690 nm.

[0032] In some embodiments, the second color filter has a transmission wavelength band for transmitting a wavelength, wherein the intensity of light emitted from the blue organic light-emitting element at that wavelength at any viewing angle of about 60° or less is substantially the same as the intensity of light emitted from the green organic light-emitting element at that wavelength.

[0033] In some embodiments, the second color filter has a transmission wavelength band that does not transmit light at the peak of the intensity of light emitted from the blue organic light-emitting element at any viewing angle of about 60° or less.

[0034] In some embodiments, the lower limit of the transmission wavelength band of the second color filter is about 460 nm to about 480 nm.

[0035] The foregoing is illustrative only and is not intended to be limiting in any way. Other aspects, embodiments, and features will become apparent from the accompanying drawings and the following detailed description, in addition to the illustrative aspects, embodiments, and features described above. Attached Figure Description

[0036] A more complete understanding of the invention will become more apparent from the detailed description of embodiments thereof with reference to the accompanying drawings, in which:

[0037] Figure 1 This is a schematic cross-sectional view illustrating an organic light-emitting display device according to an exemplary embodiment;

[0038] Figure 2 It is shown Figure 1 An enlarged cross-sectional view of the display unit of an organic light-emitting display device;

[0039] Figures 3A to 3B This is a diagram showing the emission spectrum of an organic light-emitting element with a resonant structure before and after resonance;

[0040] Figure 4 This is a graph showing the correlation changes in the emission spectrum and side brightness ratio of an organic light-emitting element with a resonant structure;

[0041] Figure 5 This is a graph showing the change in the emission spectrum of a red organic light-emitting element according to an exemplary embodiment as the viewing angle changes from 0° to 60° at 3° intervals;

[0042] Figure 6 This is a graph showing the change in the emission spectrum of a green organic light-emitting element according to an exemplary embodiment as the viewing angle changes from 0° to 60° at 3° intervals;

[0043] Figure 7 This is a graph showing the change in the emission spectrum of a blue organic light-emitting element according to an exemplary embodiment as the viewing angle changes from 0° to 60° at 3° intervals;

[0044] Figure 8 This is a diagram showing the optical loss caused by viewing angle variation at a red color filter with a transmission wavelength band corresponding to the emission spectrum after resonance with the red organic light-emitting element;

[0045] Figure 9 This is a graph showing the peak point of the light intensity of an organic light-emitting element as the viewing angle increases; and a transmission wavelength band of a color filter according to an exemplary embodiment for compensating for the peak point variation; and

[0046] Figure 10 This is a schematic cross-sectional view illustrating an organic light-emitting display device according to another exemplary embodiment. Detailed Implementation

[0047] Embodiments will now be described more fully below with reference to the accompanying drawings. Although the invention may be modified in various ways and has several embodiments, embodiments are shown in the drawings and will be primarily described therein in the specification. However, the scope of the invention is not limited to these embodiments and should be construed as including all changes, equivalents, and substitutions included within the spirit and scope of the invention.

[0048] In the accompanying drawings, the thicknesses of the multiple layers and regions are shown in an enlarged manner to clearly and easily describe the thicknesses of the multiple layers and regions.

[0049] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that terms such as those defined in common dictionaries shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0050] In order to specifically describe the embodiments of the present invention, some parts that are not related to the description may not be provided, and throughout the specification, the same reference numerals refer to the same elements.

[0051] Figure 1 This is a schematic cross-sectional view showing an organic light-emitting display device according to an embodiment; Figure 2 It is shown Figure 1 An enlarged cross-sectional view of the display unit of an organic light-emitting display device; Figure 3A and Figure 3B This is a diagram showing the emission spectrum before and after resonance in an organic light-emitting element with a resonant structure; and Figure 4 This is a graph showing the correlation between the emission spectrum and the side brightness ratio of an organic light-emitting element with a resonant structure.

[0052] In the following text, reference will be made to Figure 1 and Figure 2 Describes an organic light-emitting display device according to an embodiment.

[0053] An organic light-emitting display device according to an embodiment includes a first substrate 100, a display unit 110 formed on the first substrate 100, a second substrate 200, a black matrix 212 formed on the second substrate 200, and a support portion 300 for supporting the first substrate 100 and the second substrate 200.

[0054] The first substrate 100 may include various flexible materials. For example, the first substrate 100 may include plastics with excellent heat resistance and durability, such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polyarylate, polyetherimide (PEI), polyethersulfone (PES), polyimide (PI), etc. However, the embodiments are not limited thereto, and as an alternative embodiment, the first substrate 100 may include a variety of materials such as glass or metal.

[0055] The second substrate 200 may include various materials as described above in the first substrate 100, and may be formed using at least one of various materials capable of forming the first substrate 100 described above.

[0056] In the case where the organic light-emitting display device according to the embodiment realizes an image in a top-emitting type in the direction of the second substrate 200, the second substrate 200 includes a transparent material. However, the first substrate 100 does not necessarily include a transparent material. On the other hand, in the case where the organic light-emitting display device according to the embodiment realizes an image in a bottom-emitting type in the direction of the first substrate 100, the first substrate 100 includes a transparent material, but the second substrate 200 does not necessarily include a transparent material.

[0057] If one of the first substrate 100 and the second substrate 200 does not include a transparent material, it may include an opaque material, such as an opaque metallic material. If one of the first substrate 100 and the second substrate 200 includes a metal, it may include at least one selected from the group consisting of carbon, iron, chromium, manganese, nickel, titanium, molybdenum, and stainless steel (SUS), but the implementation is not limited thereto. The display unit 110 is disposed on the upper surface of the first substrate 100. Here, the term "display unit 110" refers to an organic light-emitting element (e.g., an organic light-emitting diode (OLED)) and a thin-film transistor (TFT) array for driving the organic light-emitting element, and means both the portion for displaying an image and the driving portion for displaying an image. However, the implementation is not limited thereto. That is, the display unit 110 can be of various types and may include, for example, a liquid crystal display (LCD) element. In the following description, for ease of explanation, an organic light-emitting display device will be used as an example.

[0058] Sealing component 210 (see Figure 2A sealing member 210 is formed on the upper surface of the first substrate 100 to cover the display unit 110. The organic light-emitting element included in the display unit 110 comprises organic materials and is susceptible to degradation by external moisture or oxygen. Therefore, a sealing member 210 is formed to protect the display unit 110. The sealing member 210 can be formed using organic or inorganic materials. The sealing member 210 may include one or more organic layers or one or more inorganic layers, and as a specific example, one or more organic layers and one or more inorganic layers may be alternately stacked at least once.

[0059] In this way, a sealing member 210 for protecting the display unit 110 can be formed, making it easy to manufacture a thin and flexible display device.

[0060] Figure 2 Detailed sectional views of the display unit 110 and the sealing member 210 are shown. When viewed in a plane, the display unit 110 includes a plurality of pixels arranged in a matrix.

[0061] Multiple pixels can realize visible light of various colors, and may include at least a red pixel Pr for generating red visible light, a green pixel Pg for generating green visible light, and a blue pixel Pb for generating blue visible light.

[0062] Each pixel includes an organic light-emitting element (OLED) and electronic components electrically connected to the OLED. The electronic components may include one or more thin-film transistors (TFTs), storage capacitors, etc. The electronic components can transmit various suitable types of electrical signals required to drive the OLED to the OLED.

[0063] Although for the purposes of description, Figure 2 Only organic light-emitting elements and driving thin-film transistors (TFTs) for driving the organic light-emitting elements are shown in the illustration, but the implementation is not limited to this. Multiple thin-film transistors (TFTs), storage capacitors, and various wiring may also be included.

[0064] Figure 2 The thin-film transistor (TFT) shown is a top-gate type and sequentially includes an active layer 102, a gate electrode 104, a source electrode 106a, and a drain electrode 106b. Although a top-gate type thin-film transistor (TFT) is disclosed herein, the implementation is not limited thereto, and various suitable types of thin-film transistors (TFTs) may be used.

[0065] refer to Figure 2 A buffer layer 101 can be formed on the upper surface of the first substrate 100 to provide flatness and prevent impurities from penetrating.

[0066] The buffer layer 101 can be deposited using various suitable deposition methods, such as SiO2 and / or SiN.x Plasma-enhanced chemical vapor deposition (PECVD), atmospheric pressure CVD (APCVD), and low-pressure CVD (LPCVD) are used. If necessary, the buffer layer 101 may not be formed. The active layer 102 is formed on the buffer layer 101 at the region corresponding to each pixel.

[0067] The active layer 102 can be formed by forming an organic semiconductor or an inorganic semiconductor such as silicon or oxide semiconductor on the buffer layer 101 over the entire surface of the first substrate 100 and patterning the organic or inorganic semiconductor. A gate insulating layer 103 for insulating the active layer 102 from the gate electrode 104 is formed on the active layer 102.

[0068] The gate insulating layer 103 may include various suitable insulating materials, such as oxides or nitrides.

[0069] The gate electrode 104 is formed in a set region or predetermined region on the gate insulating layer 103. The gate electrode 104 is connected to the gate line for applying the on / off signal of the thin-film transistor TFT.

[0070] An insulating intermediate layer 105 is formed on the gate electrode 104, and the source electrode 106a and drain electrode 106b respectively contact portions of the active layer 102 through contact holes. For example, the source electrode 106a and drain electrode 106b are formed to contact the source and drain regions of the active layer 102. The thin-film transistor (TFT) thus formed is covered and protected by a passivation layer 107.

[0071] The passivation layer 107 may use an inorganic insulating layer and / or an organic insulating layer. The inorganic insulating layer may include, for example, SiO2 or SiN. x The materials used include SiON, Al2O3, TiO2, Ta2O5, HfO2, ZrO2, BST, and PZT. The organic insulating layer can include, for example, common polymers (PMMA, PS), polymer derivatives with phenolic groups, acrylic polymers, imide polymers, aryl ether polymers, amide polymers, fluoropolymers, p-xylyl polymers, vinyl alcohol polymers, and mixtures thereof. Furthermore, the passivation layer 107 can be formed as a composite laminate of an inorganic insulating layer and an organic insulating layer.

[0072] The organic light-emitting element is disposed on the passivation layer 107 in the light-emitting area.

[0073] The organic light-emitting display device may include a pixel electrode 111 formed on a passivation layer 107, a counter electrode 112 opposite to the pixel electrode 111, and an intermediate layer interposed between the pixel electrode 111 and the counter electrode 112 and including an organic light-emitting layer.

[0074] Organic light-emitting display devices are classified into bottom-emitting, top-emitting, and dual-emitting types based on their emission direction. In the case of a bottom-emitting type, the pixel electrode 111 is configured as a transparent electrode, and the opposing electrode 112 is configured as a reflective electrode. In the case of a top-emitting type, the pixel electrode 111 is configured as a reflective electrode, and the opposing electrode 112 is configured as a semi-transparent reflective electrode. In this embodiment, the organic light-emitting display device is described as a top-emitting type, wherein it emits light in the direction of the sealing member 210.

[0075] The pixel electrode 111 may include a reflective layer and a transparent layer. The reflective layer may include, for example, Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, and their compounds, and the transparent layer may include, for example, ITO, IZO, ZnO, or In2O3 having a high work function. The pixel electrode 111 may be patterned into an island shape corresponding to each pixel. Additionally, the pixel electrode 111 may be connected to an external terminal to serve as an anode electrode.

[0076] A pixel defining layer 109 is disposed on the pixel electrode 111, overlapping the edge portion of the pixel electrode 111 and having a defined opening or predetermined opening that exposes the central portion of the pixel electrode 111. An organic light-emitting layer 113 is formed to define a light-emitting region, emitting light at the region defined by the opening. In this embodiment, when the light-emitting region is defined by the opening of the pixel defining layer 109, portions protruding from the light-emitting region naturally appear between the light-emitting regions, and since no organic light-emitting layer is formed there, these portions become non-light-emitting regions.

[0077] Preferably, the counter electrode 112 is a transmission electrode. The counter electrode 112 can be a semi-transparent reflective layer formed as a thin metal layer, including, for example, Li, Ca, LiF / Ca, LiF / Al, Al, Mg, and Ag having a small work function. Obviously, a light-transmitting conductive layer, including, for example, ITO, IZO, ZnO, or In2O3, is formed on the semi-transparent reflective metal layer to compensate for the high resistance problem caused by the small thickness of the semi-transparent reflective metal layer. The counter electrode 112 can be formed as a common electrode across the entire surface of the first substrate 100. Furthermore, such a counter electrode 112 can be connected to an external terminal and used as a cathode electrode.

[0078] The intermediate layer may include an organic light-emitting layer 113 that emits light, and the organic light-emitting layer 113 may include low molecular weight organic materials or high molecular weight organic materials.

[0079] In addition to the organic light-emitting layer 113, the intermediate layer may also include at least one of a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL), and an electron injection layer (EIL). In an alternative embodiment, when the organic light-emitting layer 113 comprises a high molecular weight organic material, only the hole transport layer may be provided between the organic light-emitting layer 113 and the pixel electrode 111. The polymer hole transport layer can be formed on the pixel electrode 111 by inkjet printing or spin coating using, for example, poly(2,4)-ethylene-dihydroxythiophene (PEDOT) or polyaniline (PANI).

[0080] The organic light-emitting layer 113 includes a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. Red, green, and blue color filters are respectively disposed on the red, green, and blue light-emitting layers in a corresponding manner. Therefore, the red, green, and blue color filters selectively transmit only specific wavelengths (e.g., red, green, or blue) of light emitted from the organic light-emitting display device and absorb the remaining wavelengths, thereby allowing the emission of one of red, green, and blue light from each pixel.

[0081] according to Figure 2 The organic light-emitting display device of the illustrated embodiment can emit white light by electrically driving pixel electrodes 111 and counter electrodes 112. Examples of methods for achieving white light in the organic light-emitting layer 113 may include: a wavelength conversion method in which a phosphor is excited using blue or violet light, and various colors of light emitted therefrom are mixed together to form a broad wavelength spectrum by a conversion manner; and a color mixing method in which two primary colors (blue and orange) or three primary colors (red, green, and blue) are mixed together to form white light. In this invention, a color mixing method is used to achieve white light.

[0082] According to Figure 2 In the organic light-emitting display device of the embodiment shown, a sealing member 210 is formed on a first substrate 100 to cover the display unit 110. The sealing member 210 includes a plurality of stacked insulating layers. For example, the plurality of insulating layers have a stacked structure in which organic layers 202 and inorganic layers 201 and 203 are alternately stacked.

[0083] Inorganic layers 201 and 203 may include metal oxides, metal nitrides, metal carbides, and / or compounds thereof, or be formed from metal oxides, metal nitrides, metal carbides, and / or compounds thereof. In embodiments, inorganic layers 201 and 203 may be, for example, alumina, silicon oxide, or silicon nitride. Inorganic layers 201 and 203 are used to suppress the permeation of moisture, oxygen, etc., into the organic light-emitting display device.

[0084] The organic layer 202 may include a polymeric organic compound, and may include any one of epoxy, acrylate, and polyurethane acrylate. The organic layer 202 is used to relieve the internal stress of the inorganic layers 201 and 203, or to compensate for defects in the inorganic layers 201 and 203 and to planarize the inorganic layers 201 and 203.

[0085] Sealing component 210 is not limited to Figure 2 The structure shown may include at least one sandwich structure, wherein at least one organic layer is disposed between at least two inorganic layers. As another example, the sealing member 210 may include at least one sandwich structure, wherein at least one inorganic layer is disposed between at least two organic layers. As another example, the sealing member 210 may include a sandwich structure with at least one organic layer disposed between at least two inorganic layers and a sandwich structure with at least one inorganic layer disposed between at least two organic layers. The uppermost layer exposed to the outside of the sealing member 210 may be formed as an inorganic layer to prevent moisture penetration.

[0086] In this implementation, the area of ​​the first organic layer can be smaller than the area of ​​the second inorganic layer, and the area of ​​the second organic layer can be smaller than the area of ​​the third inorganic layer. As another example, the first organic layer can be formed to be completely covered by the second inorganic layer, and the second organic layer can be formed to be completely covered by the third inorganic layer.

[0087] As described above, a plurality of black matrices 212 are formed on the second substrate 200. The black matrices 212 are formed corresponding to the non-light-emitting areas. The black matrices 212 can be formed with openings corresponding to the light-emitting areas. Furthermore, the black matrices 212 substantially prevent the visible light of different colors realized in each pixel from abnormally mixing or affecting each other. Additionally, the black matrices 212 can substantially prevent the components of the thin-film transistor (TFT) from being damaged by external light.

[0088] The black matrix 212 can include various suitable materials. In this invention, it can be made by using black pigments, chromium oxide (CrO2), etc. x (e.g., mixed black organic materials to easily form a black matrix 212.)

[0089] The method for forming the black matrix 212 varies depending on the material used. However, when the black matrix 212 includes commonly used chromium or chromium oxide, a single layer of chromium or chromium oxide is formed by methods such as sputtering or electron beam deposition. In some examples, chromium or chromium oxide can be used to form two or three layers. The cross-section of the black matrix 212 can be as follows: Figure 2 The rectangle shown can also be trapezoidal to increase the side brightness ratio.

[0090] In the implementation method, such as Figure 2As shown, the organic light-emitting display device may include multiple color filters 211 corresponding to multiple light-emitting areas.

[0091] For example, multiple color filters 211 can be disposed at the opening defined by the black matrix 212. Additionally, a portion of the multiple color filters 211 can overlap with a portion of the black matrix 212. However, the implementation is not limited to this structure, and the multiple color filters 211 can be configured such that the thickness of the multiple color filters 211 is substantially equal to the thickness of the black matrix 212.

[0092] Multiple color filters 211 may include a coloring material and an organic material in which the coloring material is dispersed. The coloring material may be a common pigment or dye, and the organic material may be a common dispersant. The multiple color filters 211 selectively allow only specific wavelengths of light (e.g., red, green, or blue) emitted from the organic light-emitting display device to pass through, and absorb light of other wavelengths, thereby allowing the emission of one of red, green, and blue light from each pixel. The multiple color filters are configured such that a red color filter 211R having red light, a green color filter 211G having green light, and a blue color filter 211B having blue light are configured to correspond to corresponding light-emitting areas, and thus, multiple light-emitting areas can emit red, green, and blue light.

[0093] Examples of methods for forming multiple color filters 211 include pigment dispersion methods, printing methods, electrodeposition methods, film transfer methods, and thermal transfer methods.

[0094] In the following text, refer to Figure 3A and Figure 3B This will describe the emission spectra of organic light-emitting elements with resonant structures before and after resonance.

[0095] As used in this article, a resonant structure is a structure in which optical resonance or microcavity effect occurs when the optical distance between two surfaces that are reflective or semi-transmissive to incident light satisfies the interference condition for light of a specific wavelength, thereby increasing the brightness or intensity of light of a specific wavelength.

[0096] like Figure 3A and Figure 3B As shown, when an organic light-emitting element has a resonant structure, the emission spectrum of the organic light-emitting element after resonance has a narrower wavelength spectrum and a larger peak light intensity compared to the wavelength spectrum and peak light intensity before resonance.

[0097] In this paper, the peak light intensity of the blue organic light-emitting element after resonance increased by approximately 30% or more compared to the peak light intensity before resonance. That is, the peak light intensity of the blue organic light-emitting element before resonance was 1 at 456.4 nm (as a relative value), while the peak light intensity of the blue organic light-emitting element after resonance was 1.32 at 455.7 nm (as a relative value).

[0098] Furthermore, for example, the emission spectrum of the blue organic light-emitting element before resonance is in the range of approximately 438 nm to approximately 510 nm relative to a light intensity of 0.2, and the emission spectrum of the blue organic light-emitting element after resonance is in the range of approximately 441 nm to approximately 482 nm relative to a light intensity of 0.2. Therefore, the transmission spectrum of the color filter is set to correspond to the emission spectrum after resonance relative to a light intensity of 0.2.

[0099] In the following text, reference will be made to Figure 4 Describe the correlation changes in the emission spectrum and side brightness ratio of organic light-emitting elements with resonant structures.

[0100] Typically, organic light-emitting display devices can be used in various viewing angle modes depending on the usage conditions. The viewing angle θ of an organic light-emitting display device according to an embodiment can vary from about 0° (the state when a user views the organic light-emitting display device from the front) to about 60°.

[0101] As the viewing angle θ changes from 0° to 60°, the emission spectra of red, green, and blue change.

[0102] The blue shift in the emission spectra of red R, green G, and blue B is most pronounced at a viewing angle of approximately 60°, and the results are shown in Table 1 below.

[0103] Table 1

[0104] category R G B Displacement (nm) 83 65 39

[0105] As can be understood from Table 1, in the case of red wavelength, as the viewing angle θ changes from 0° to 60°, the peak point of the wavelength can shift by a maximum of approximately 83 nm (at a viewing angle of 60°); in the case of green wavelength, as the viewing angle θ changes from 0° to 60°, the peak point of the wavelength can shift by a maximum of approximately 65 nm (at a viewing angle of 60°); and in the case of blue wavelength, as the viewing angle θ changes from 0° to 60°, the peak point of the wavelength can shift by a maximum of approximately 39 nm (at a viewing angle of 60°). However, as mentioned above, the wavelength band that the color filter 211 can transmit is set or predetermined. Therefore, as the emission spectra of red, green, and blue shift, the amount of light transmitted through the color filter 211 may change, and the lateral brightness ratio of the ultimately emitted light based on the viewing angle θ may change.

[0106] In other words, since at least one of the organic light-emitting elements can have a resonant structure, the emission spectra of red, green and blue may shift to shorter wavelengths as the viewing angle θ of the organic light-emitting element changes from 0° to 60°.

[0107] In the case of red emission spectrum, as the viewing angle changes from 0° to 60°, the peak point of the wavelength of the red organic light-emitting element shifts from about 60 nm to about 83 nm.

[0108] In the case of green emission spectrum, as the viewing angle changes from 0° to 60°, the peak point of the wavelength of green organic light-emitting element shifts from about 55 nm to about 65 nm.

[0109] Furthermore, in the case of blue emission spectrum, as the viewing angle changes from 0° to 60°, the peak point of the wavelength of light emitted from the blue organic light-emitting element shifts by approximately 34 nm to approximately 39 nm.

[0110] For example, in the case of red filter 211R, since the peak point of the red wavelength shifts by a maximum of approximately 83 nm as the viewing angle changes from 0° to 60°, red light of the wavelength corresponding to the first region R1 may not be able to pass through red filter 211R. Therefore, the lateral brightness ratio of the ultimately emitted red light may be reduced. Referring to the graph related to lateral brightness ratio, it can be understood that the lateral brightness ratio of red light decreases as the viewing angle θ increases.

[0111] Furthermore, in the case of green filter 211G and blue filter 211B, since the peak points of the green and blue wavelengths shift by a maximum of approximately 65 nm and 39 nm respectively as the viewing angle changes from 0° to 60°, green light of the wavelength corresponding to the second region G1 may not be able to pass through the green filter 211G, and blue light of the wavelength corresponding to the third region B1 may not be able to pass through the blue filter 211B. Therefore, as the viewing angle θ increases, the lateral brightness ratios of both the ultimately emitted green and blue light decrease. However, referring to the graph related to the lateral brightness ratio, it can be understood that as the viewing angle θ increases, the lateral brightness ratios of green and blue light decrease much less than the decrease in the lateral brightness ratio of red light. This is because the amount of light in the first region R1 that may not pass through the red filter 211R is greater than the amount of light in the second region G1 that may not pass through the green filter 211G and the amount of light in the third region B1 that may not pass through the blue filter 211B.

[0112] Figure 5 This is a graph showing the change in the emission spectrum of the red organic light-emitting element according to the embodiment as the viewing angle is changed from 0° to 60° in 3° intervals. Figure 6 This is a graph showing the change in the emission spectrum of the green organic light-emitting element according to the embodiment as the viewing angle changes from 0° to 60° in 3° intervals. Figure 7 This is a graph showing the change in the emission spectrum when the viewing angle of the blue organic light-emitting element according to the embodiment is changed from 0° to 60° in 3° intervals.

[0113] Reference Figure 5 It is understood that as the viewing angle changes from 0° to 60°, the peak wavelength of the emission spectrum of the red organic light-emitting element in the organic light-emitting display device according to the embodiment changes from about 635 nm to about 552 nm.

[0114] Reference Figure 5 In red organic light-emitting elements, the red emission spectrum (solid line) changes to a green emission spectrum (dashed line) at a viewing angle of about 45° or greater.

[0115] In other words, in a red organic light-emitting element, the red emission spectrum (solid line) changes to a green emission spectrum (dashed line) at a viewing angle of 45° or greater, and the peak of light intensity is at about 575 nm.

[0116] Additionally, refer to Figure 6It can be understood that as the viewing angle changes from 0° to 60°, the peak wavelength of the emission spectrum of the green organic light-emitting element in the organic light-emitting display device according to the embodiment changes from about 544 nm to about 479 nm. In the green organic light-emitting element, the green emission spectrum (solid line) changes to a blue emission spectrum (dashed line) at a viewing angle of about 45° or greater.

[0117] In other words, in green organic light-emitting elements, the green emission spectrum (solid line) changes to the blue emission spectrum (dashed line) at a viewing angle of 45° or greater, and the peak of light intensity is at about 485 nm.

[0118] Additionally, refer to Figure 7 It is understood that as the viewing angle changes from 0° to 60°, the peak wavelength of the emission spectrum of the blue organic light-emitting element in the organic light-emitting display device according to the embodiment changes from about 471 nm to about 432 nm.

[0119] In the following text, refer to Figure 8 and Figure 9 The emission spectra of red, green, and blue organic light-emitting elements with resonant structures according to the embodiment, varying with viewing angle, will be compared with the transmission spectra of red filter 211R, green filter 211G, and blue filter 211B.

[0120] Figure 8 This is a diagram showing the optical loss caused by viewing angle variation at a red color filter having a transmission wavelength band corresponding to the emission spectrum after resonance with a red organic light-emitting element, and... Figure 9 It is a graph showing how the peak point of the light intensity of the organic light-emitting element changes with the increase of the viewing angle; and a transmission wavelength band of the color filter according to the embodiment for compensating for the change of the peak point.

[0121] Reference Figure 8 and Figure 9 As described above, when the color filter 211 has a transmission wavelength band corresponding to the resonant structure of the organic light-emitting element for transmitting light with a set light intensity, a predetermined light intensity, or a greater light intensity, the light emitted from the organic light-emitting element has an emission spectrum that shifts towards shorter wavelengths as the viewing angle increases. Therefore, the amount of light transmitted through the color filter 211 decreases as the viewing angle increases.

[0122] For example, refer to Figure 8Curves A, B, and C, at a 0° viewing angle, indicate that color filters typically have a transmission wavelength band for transmitting light with a relative light intensity of 0.2 or greater from the light emitted from the organic light-emitting element. In this case, the upper and lower limits of the transmission wavelength band of the color filter are set to transmit wavelengths with a first intensity or greater, where the first intensity is the same relative light intensity (in the following text, light intensity means relative light intensity).

[0123] In this case, compared to organic light-emitting elements of other colors, the light emitted from the red organic light-emitting element shifts more towards shorter wavelengths as the viewing angle increases. Therefore, the amount of light transmitted through the red color filter is reduced more than the amount of light transmitted through other color filters.

[0124] Reference Figure 8 A red color filter 211R having a transmission wavelength band corresponding to its resonant emission spectrum is opaque to light in the range from about 515 nm to about 545 nm, which is the region between two such lines, which alternate between a long dash and two short dashes. In other words, a red color filter 211R having a transmission wavelength band corresponding to its resonant emission spectrum is opaque to light emitted from a red organic light-emitting element in a wavelength band between the intersection point (at 545 nm) and the intersection point (at 515 nm), wherein, at the intersection point (at 545 nm), the resonant emission spectrum of the red organic light-emitting element at an angle of about 0° (thick solid line A) intersects with the resonant emission spectrum of the green organic light-emitting element (dashed line B'); and at the intersection point (at 515 nm), the resonant emission spectrum of the red organic light-emitting element at an increased angle of view (e.g., 60°) (thick dashed line A') intersects with the resonant emission spectrum of the green organic light-emitting element (dashed line B').

[0125] Similarly, refer to Figure 8 A green color filter 211G, having a transmission wavelength band corresponding to the resonant emission spectrum, can block light in the range from approximately 460 nm to approximately 480 nm. Figure 8The region between the solid lines. In other words, the green filter 211G, having a transmission wavelength band corresponding to the resonant emission spectrum, can block light emitted from the green organic light-emitting element in the wavelength band between the cross point (at 480 nm) and the cross point (at 460 nm). At the cross point (at 480 nm), the resonant emission spectrum of the green organic light-emitting element at a 0° viewing angle (solid line B) intersects with the resonant emission spectrum of the blue organic light-emitting element (thin, alternating long and short dashed lines C'); at the cross point (at 460 nm), the resonant emission spectrum of the green organic light-emitting element at an increased viewing angle (e.g., 60°) (dashed line B') intersects with the resonant emission spectrum of the blue organic light-emitting element (thin, alternating long and short dashed lines C').

[0126] Taking into account the wavelength shift according to the viewing angle, the color filter according to the embodiment has a larger transmission wavelength band toward shorter wavelengths. In other words, the transmission wavelength band of the color filter according to the embodiment has an upper limit value for transmitting light wavelengths corresponding to a first intensity of light emitted from the organic light-emitting element at a 0° viewing angle, and a lower limit value for transmitting wavelengths of a second intensity less than the first intensity.

[0127] For example, refer to Figure 8 and Figure 9 Curve A in the embodiment shows that the transmission wavelength band of the red color filter 211R has an upper limit value (e.g., about 690 nm) for transmitting light wavelengths corresponding to 0.2 and a lower limit value (e.g., about 515 nm) for transmitting wavelengths corresponding to 0.10, where 0.2 is a first intensity of light emitted from the red organic light-emitting element at a 0° viewing angle and 0.10 is a second intensity less than the first intensity.

[0128] Additionally, refer to Figure 9 According to an embodiment, the red color filter 211R has a transmission wavelength band for transmitting a wavelength, wherein the intensity of light emitted from the green organic light-emitting element at that wavelength at any viewing angle of about 60° or less is substantially the same as the intensity of light emitted from the red organic light-emitting element at that wavelength. Additionally, according to an embodiment, the red color filter 211R has a transmission wavelength band that does not transmit the wavelength corresponding to the peak point of the intensity of light emitted from the green organic light-emitting element at any viewing angle of about 60° or less.

[0129] In other words, the lower limit of the transmission wavelength band of the red color filter 211R according to the embodiment is greater than the wavelength of the peak light intensity of the green organic light-emitting element at a 60° viewing angle, and less than a wavelength, that is, the light intensity of the green organic light-emitting element at that wavelength is the same as the light intensity of the red organic light-emitting element at any viewing angle of about 60° or less. That is, the lower limit of the transmission wavelength band of the red color filter 211R is located between about 515 nm and about 545 nm.

[0130] Preferably, such as Figure 5 As shown, considering that the peak intensity of the red emission spectrum (solid line) changes to the green emission spectrum (dashed line) at a viewing angle of 45°, the lower limit of the transmission wavelength band of the red color filter 211R can be set relative to a viewing angle of 45°.

[0131] Furthermore, according to the embodiment, the upper limit of the transmission wavelength band of the red color filter 211R is, for example, 690 nm, which is the same as the upper end of the resonant emission spectrum at a 0° viewing angle when the relative light intensity is 0.2. However, the embodiment is not limited to this, and the upper limit of the transmission wavelength band of the red color filter 211R can be a value between about 690 nm and about 722 nm, which is about 0 nm to about 32 nm larger than the upper end of the resonant emission spectrum.

[0132] Reference Figure 9 When compensating for optical losses that occur up to a 60° viewing angle, the red filter 211R according to the embodiment has a transmission wavelength band in the range of about 515 nm to about 690 nm.

[0133] When compensating for optical losses that occur up to a 45° viewing angle, the red filter 211R according to the embodiment has a lower limit value of a transmission wavelength band greater than 515 nm and less than 545 nm.

[0134] Therefore, the red filter 211R according to the embodiment can also transmit light wavelengths located at such intersections that the emission spectrum (thick dashed line A') of the red organic light-emitting element after resonance at an increased viewing angle intersects with the emission spectrum (dashed line B') of the green organic light-emitting element after resonance. Thus, the red filter 211R according to the embodiment can substantially prevent optical loss of the red organic light-emitting element at an increased viewing angle.

[0135] Similarly, refer to Figure 9Curve B in the figure shows that the transmission wavelength band of the green filter 211G according to the embodiment has an upper limit value (e.g., about 600 nm) for transmitting light wavelengths corresponding to 0.2, and a lower limit value (e.g., about 460 nm) for transmitting wavelengths corresponding to 0.07, where 0.2 is a first intensity of light emitted from the green organic light-emitting element at a 0° viewing angle, and 0.07 is a second intensity less than the first intensity.

[0136] Furthermore, the green filter 211G according to the embodiment has a transmission wavelength band for transmitting a wavelength, wherein the intensity of light emitted from the blue organic light-emitting element at that wavelength at any viewing angle of about 60° or less is substantially the same as the intensity of light emitted from the green organic light-emitting element at that wavelength. Additionally, the green filter 211G according to the embodiment has a transmission wavelength band that does not transmit the wavelength corresponding to the peak point of the intensity of light emitted from the blue organic light-emitting element at any viewing angle of about 60° or less.

[0137] In other words, the lower limit of the transmission wavelength band of the green filter 211G according to the embodiment is greater than the wavelength of the peak light intensity of the blue organic light-emitting element at a 60° viewing angle, and less than a wavelength, that is, the light intensity of the blue organic light-emitting element at that wavelength is the same as the light intensity of the green organic light-emitting element at any viewing angle of 60° or less. That is, the lower limit of the transmission wavelength band of the green filter 211G is located between about 460 nm and about 480 nm.

[0138] Preferably, such as Figure 6 As shown, considering that the peak intensity of the green emission spectrum (solid line) changes to the blue emission spectrum (dashed line) at a viewing angle of 45°, the lower limit of the transmission wavelength band of the green color filter 211G can be set relative to a viewing angle of 45°.

[0139] Furthermore, the upper limit of the transmission wavelength band of the green filter 211G according to the embodiment is, for example, 600 nm, which is the same as the upper end of the emission spectrum after resonance at a 0° viewing angle when the relative light intensity is 0.2. However, the embodiment is not limited to this, and the upper limit of the transmission wavelength band of the green filter 211G can be a value between about 600 nm and about 625 nm, which is about 0 nm to about 25 nm larger than the upper end of the resonance emission spectrum.

[0140] Reference Figure 9 When compensating for optical losses that occur up to a 60° viewing angle, the green filter 211G according to the embodiment has a transmission wavelength band in the range of about 460 nm to about 600 nm.

[0141] When compensating for optical losses that occur up to a 45° viewing angle, the green filter 211G according to the embodiment has a lower limit value of a transmission wavelength band greater than 460 nm and less than 480 nm.

[0142] Therefore, the green filter 211G according to the embodiment can also transmit light wavelengths located at such an intersection point where the emission spectrum (dashed line B') of the green organic light-emitting element after resonance at an increased viewing angle intersects with the emission spectrum (thin, alternating long and short dashed lines C') of the blue organic light-emitting element after resonance. Thus, the green filter 211G according to the embodiment can substantially prevent optical loss of the green organic light-emitting element at an increased viewing angle.

[0143] According to the embodiment, the blue filter 211B has a transmission wavelength band for transmitting all wavelengths corresponding to the peak points of light intensity from a viewing angle of 0° to 60° for the blue organic light-emitting element.

[0144] Reference Figure 9 The blue filter 211B according to the embodiment has a transmission wavelength band having an upper limit value (e.g., about 515 nm) for transmitting light wavelengths corresponding to 0.2 and a lower limit value (e.g., about 430 nm) for transmitting wavelengths corresponding to 0.02, wherein 0.2 is a first intensity of light emitted from the blue organic light-emitting element at a 0° viewing angle and 0.02 is a second intensity less than the first intensity.

[0145] Reference Figure 9 According to the embodiment, the upper limit of the transmission wavelength band of the blue filter 211B (e.g., 515 nm) can be greater than the wavelength at such a crossover point (e.g., 505 nm), at which the light intensity of the blue organic light-emitting element is the same as that of the green organic light-emitting element at a 0° viewing angle.

[0146] In one embodiment, the upper limit of the transmission wavelength band of the blue filter 211B is set to, for example, 515 nm, which is the same as the upper end of the emission spectrum after resonance at a 0° viewing angle when the relative light intensity is 0.2. However, the embodiment is not limited to this, and the upper limit of the transmission wavelength band of the blue filter 211B can be a value between about 515 nm and about 530 nm, which is about 0 nm to about 15 nm larger than the upper end of the resonant emission spectrum.

[0147] Reference Figure 9 The blue filter 211B according to the embodiment has a transmission wavelength band in the range of about 430 nm to about 515 nm to compensate for optical loss at viewing angles from 0° to about 60°.

[0148] As described above, the lower limit of the transmission wavelength band of each color filter is less than the lower limit of the wavelength corresponding to the first light intensity (e.g., 0.2) for each corresponding organic light-emitting element in the organic light-emitting element.

[0149] In this embodiment, the lower limits of the transmission wavelength bands of the red, green, and blue color filters are progressively further away from the lower limit of the wavelength corresponding to the first light intensity for each corresponding organic light-emitting element. That is, compared to the lower limit of the transmission wavelength band of each corresponding color filter (which is set to be the same as the lower limit of the emission spectrum corresponding to the first light intensity after resonance with each corresponding organic light-emitting element), the lower limits of the transmission wavelength bands of the red filter 211R, green filter 211G, and blue filter 211B according to this embodiment extend further toward shorter wavelengths in the order R>G>B.

[0150] Furthermore, the second light intensity of the organic light-emitting element used to set the lower limit value of the transmission wavelength band of the color filter 211 according to the embodiment decreases in the order of red organic light-emitting element, green organic light-emitting element and blue organic light-emitting element, thereby satisfying R>G>B.

[0151] In the following text, reference will be made to Figure 10 Describes an organic light-emitting display device according to another embodiment.

[0152] Figure 10 This is a schematic cross-sectional view showing an organic light-emitting display device according to another embodiment.

[0153] Reference Figure 10 According to another embodiment, the organic light-emitting display device can adjust a first separation distance d1 between the edge portion of the red color filter 211R and the edge portion of the black matrix 212b, a second separation distance d2 between the edge portion of the green color filter 211G and the edge portion of the black matrix 212c, and a third separation distance d3 between the edge portion of the blue color filter 211B and the edge portion of the black matrix 212d.

[0154] In this embodiment, the first separation distance d1, the second separation distance d2, and the third separation distance d3 can be adjusted considering the change in the lateral brightness ratio of each wavelength according to the change in viewing angle θ, and thus, optical loss can be substantially prevented. In this embodiment, since the changes in the lateral brightness ratio of each wavelength are different from each other, the first separation distance d1, the second separation distance d2, and the third separation distance d3 can also be determined differently. However, since the change in the lateral brightness ratio caused by red light is relatively greater than the change in the lateral brightness ratio caused by green and blue light, the amount of compensation for optical loss is determined by the first separation distance d1. As an example, the first separation distance d1 can be configured to be greater than the second separation distance d2 and the third separation distance d3. As another example, the second separation distance d2 can be configured to be greater than the third separation distance d3.

[0155] For example, the first separation distance d1 between the end portion of the red filter 211R and the end portion of the adjacent black matrix, the second separation distance d2 between the end portion of the green filter 211G and the end portion of the adjacent black matrix, and the third separation distance d3 between the end portion of the blue filter 211B and the end portion of the adjacent black matrix are different from each other, and their dimensions satisfy d1>d2>d3.

[0156] In the implementation, in addition to the separation distances d1, d2 and d3, the cone angles of the end portions of the black matrices 212a, 212b, 212c and 212d can be adjusted to adjust the side brightness ratio according to the viewing angle θ.

[0157] Each of the end portions of the black matrix adjacent to the color filter that transmits different colors according to the embodiment has a cone angle of approximately 90° or less. Furthermore, the respective end portions of the black matrix adjacent to the color filter that transmits different colors have different cone angles from each other.

[0158] Reference Figure 10 The end portion 214a of the black matrix adjacent to the red filter 211R has a first tilt angle δ1 of less than 90°. Therefore, compared with the case of a 90° tilt angle, the end portion 214a of the black matrix adjacent to the red filter 211R can transmit light emitted from the red organic light-emitting element well at an increased viewing angle θ.

[0159] The end portion 214b of the black matrix adjacent to the green filter 211G has a second tilt angle δ2 that is less than 90° and greater than the first tilt angle δ1. Therefore, compared to the case of a 90° tilt angle, the end portion 214b of the black matrix adjacent to the green filter 211G can transmit light emitted from the green organic light-emitting element well at an increased viewing angle θ.

[0160] The end portion 214c of the black matrix adjacent to the blue filter 211B has a third tilt angle δ3 that is less than 90° and greater than the second tilt angle δ2.

[0161] Therefore, when comparing the magnitude of the first tilt angle δ1 of the end portion 214a of the black matrix adjacent to the red filter 211R, the magnitude of the second tilt angle δ2 of the end portion 214b of the black matrix adjacent to the green filter 211G, and the magnitude of the third tilt angle δ3 of the end portion 214c of the black matrix adjacent to the blue filter 211B, the condition “δ1 < δ2 < δ3” is satisfied.

[0162] Furthermore, it is evident that the side brightness ratio of the red, green, and blue organic light-emitting elements can be adjusted by adjusting the cone angle δ1 of the end portion 214a, the cone angle δ2 of the end portion 214b, and the cone angle δ3 of the end portion 214c of the black matrix, as well as by adjusting the first separation distance d1, the second separation distance d2, and the third separation distance d3, and thus, optical loss can be substantially prevented.

[0163] The organic light-emitting display device according to the embodiments of the present invention described above can compensate for optical losses caused by blue shift, and thereby reduce the brightness difference of the organic light-emitting display device according to the viewing angle.

[0164] As described above, an organic light-emitting display device according to one or more embodiments can compensate for optical losses that may occur due to blue shift by extending the transmission wavelength band of the color filter toward a shorter wavelength.

[0165] It will be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Therefore, without departing from the spirit and scope of the inventive concept, the first element, first component, first region, first layer, or first portion discussed above may be referred to as a second element, second component, second region, second layer, or second portion.

[0166] The terminology used herein is for the purpose of describing particular embodiments and is not intended to limit the inventive concept. As used herein, the singular forms “a” and “an” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that, when used in this specification, the terms “comprising,” “including,” “containing,” and / or “comprising” specify the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0167] For the purposes of this disclosure, “at least one of X, Y and Z” and “at least one selected from the group consisting of X, Y and Z” can be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y and Z, such as, for example, XYZ, XYY, YZ and ZZ.

[0168] Furthermore, the use of "may" in describing embodiments of the inventive concept refers to "one or more embodiments of the inventive concept." Additionally, the term "exemplary" is intended to indicate an example or illustration.

[0169] It will be understood that when an element or layer is referred to as being "on," "connected to," "attached to," or "adjacent to" another element or layer, it may be directly on, directly connected to, directly attached to, or directly adjacent to that other element or layer, or there may be one or more intermediate elements or layers. When an element or layer is referred to as being "directly" on, directly connected to, directly attached to, or "closely adjacent to" another element or layer, there are no intermediate elements or layers.

[0170] As used herein, “about” or “approximately” includes the value as well as the average of the values ​​within an acceptable range of deviations from the particular value, as determined by a person skilled in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, “about” may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the value.

[0171] As used in this article, the terms “use,” “using,” and “used” can be understood as synonyms with the terms “utilize,” “utilizing,” and “utilized,” respectively.

[0172] Furthermore, any numerical range described herein is intended to include all subranges with the same numerical precision contained within the described range. For example, the range "1.0 to 10.0" is intended to include all subranges between the described minimum value of 1.0 and the described maximum value of 10.0 (inclusive), that is, minimum values ​​equal to or greater than 1.0 and maximum values ​​equal to or less than 10.0, such as, for example, 2.4 to 7.6. Any maximum numerical limit described herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit described herein is intended to include all higher numerical limits contained therein. Therefore, the applicant reserves the right to modify this specification, including the claims, to clearly describe any subranges contained within the range expressly described herein. All such ranges are inherently described in this specification.

[0173] Although the invention has been shown and described with reference to embodiments thereof, it will be apparent to those skilled in the art that various suitable changes in form and detail may be made to the invention without departing from the spirit and scope thereof.

Claims

1. An organic light emitting display apparatus comprising: a first substrate; a second substrate opposite to the first substrate; a plurality of organic light emitting elements on the first substrate; and a color filter on the organic light emitting elements, wherein a transmission wavelength band of the color filter has an upper limit value for transmitting a wavelength of light corresponding to a first intensity of light emitted from the organic light emitting elements at a viewing angle of 0° and has a lower limit value for transmitting a wavelength of light corresponding to a second intensity less than the first intensity. The lower limit value of the transmission wavelength band of the color filter is less than a lower limit value of a wavelength of light corresponding to the first intensity of the organic light emitting elements.

2. The organic light emitting display apparatus according to claim 1, wherein, The organic light emitting elements include a red organic light emitting element, a green organic light emitting element, and a blue organic light emitting element, 3.The organic light emitting display apparatus of claim 1, wherein, wherein the color filter includes a first color filter on the red organic light emitting element, a second color filter on the green organic light emitting element, and a third color filter on the blue organic light emitting element, and wherein lower limit values of transmission wavelength bands of the third color filter, the second color filter, and the first color filter are sequentially farther from lower limit values of wavelengths corresponding to the first intensity of each of the respective organic light emitting elements among the organic light emitting elements. The organic light emitting elements include a red organic light emitting element, a green organic light emitting element, and a blue organic light emitting element, and 4. The organic light emitting display apparatus according to claim 1, wherein, wherein the second intensity decreases in an order of the red organic light emitting element, the green organic light emitting element, and the blue organic light emitting element. The first color filter has a transmission wavelength band for transmitting a wavelength at which an intensity of light emitted from the green organic light emitting element is the same as an intensity of light emitted from the red organic light emitting element at any viewing angle of 60° or less.

5. The organic light emitting display apparatus according to claim 3, wherein, The first color filter has a transmission wavelength band that does not transmit a wavelength corresponding to a peak point of an intensity of light emitted from the green organic light emitting element at a viewing angle of 60°.

6. The organic light emitting display apparatus according to claim 5, wherein, The second color filter has a transmission wavelength band for transmitting a wavelength at which an intensity of light emitted from the blue organic light emitting element is the same as an intensity of light emitted from the green organic light emitting element at any viewing angle of 60° or less.

7. The organic light emitting display apparatus according to claim 3, wherein, The second color filter has a transmission wavelength band that does not transmit a wavelength corresponding to a peak point of an intensity of light emitted from the blue organic light emitting element at a viewing angle of 60°.

8. The organic light emitting display apparatus according to claim 7, wherein, The third color filter has a transmission wavelength band that transmits all wavelengths corresponding to peak points of intensities of light emitted from the blue organic light emitting element at viewing angles of 0° to 60°.

9. The organic light emitting display apparatus according to claim 3, wherein, An upper limit value of the transmission wavelength band of the third color filter is greater than a wavelength at a crossing point at which an intensity of light emitted from the blue organic light emitting element is the same as an intensity of light emitted from the green organic light emitting element at a viewing angle of 0°.

10. The organic light emitting display apparatus according to claim 3, wherein, A lower limit value of the transmission wavelength band of the first color filter is 515 nm to 545 nm.

11. The organic light emitting display apparatus according to claim 3, wherein, The first color filter has a transmission wavelength band of 515 nm to 690 nm, 12. The organic light emitting display apparatus according to claim 3, wherein, wherein the second color filter has a transmission wavelength band of 460 nm to 600 nm, and wherein the third color filter has a transmission wavelength band of 400 nm to 550 nm. The third color filter has a transmission wavelength band of 430 nm to 515 nm.

13. The organic light emitting display apparatus according to claim 3, wherein, The lower limit value of the transmission wavelength band of the second color filter is 460 nm to 480 nm.

14. The organic light emitting display apparatus according to claim 9, wherein, The upper limit value of the transmission wavelength band of the third color filter is 515 nm to 530 nm.

Images