Display device

Abstract

The present application relates to a display device with improved reliability. The display device includes a display panel, a wavelength control layer disposed on the display panel, a light control member disposed on the wavelength control layer, and a cover layer disposed on the light control member. The light control member includes an inorganic layer disposed on the wavelength control layer and having a first refractive index, a first light control layer disposed on the inorganic layer and having a second refractive index, a second light control layer disposed on the first light control layer and having a third refractive index, and a color filter layer disposed on the second light control layer. The first refractive index is greater than the second refractive index and less than a refractive index of the wavelength control layer, and the third refractive index is greater than the second refractive index and less than a refractive index of the color filter layer.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2020-0071856, filed on June 12, 2020, and all rights arising therefrom, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure relates to a display device, and more specifically, to a display device with improved reliability. Background Technology

[0004] Various display devices are being developed for multimedia devices such as televisions, mobile phones, tablet computers, and game consoles. These display devices can include different types of wavelength control layers depending on the pixels to generate color images. The wavelength control layer can transmit a portion of the wavelength range of the source light or convert the wavelength range of the source light.

[0005] This display device may include various optical functional layers to provide users with improved quality color images, and research is underway to reduce external light reflectivity. Summary of the Invention

[0006] This disclosure provides a display device with reduced external light reflectivity.

[0007] An embodiment of the present invention provides a display device, comprising: a display panel; a wavelength control layer disposed on the display panel; a light control component disposed on the wavelength control layer; and a cover layer disposed on the light control component. The light control component comprises: an inorganic layer disposed on the wavelength control layer and having a first refractive index; a first light control layer disposed on the inorganic layer and having a second refractive index; a second light control layer disposed on the first light control layer and having a third refractive index; and a color filter layer disposed on the second light control layer. In such an embodiment, the first refractive index is greater than the second refractive index and less than the refractive index of the wavelength control layer, wherein the third refractive index is greater than the second refractive index and less than the refractive index of the color filter layer.

[0008] In an implementation, each of the first and third refractive indices may be in the range of about 1.4 to about 1.5.

[0009] In this implementation, the thickness of the inorganic layer can be approximately 2.5 kiloangeros. to approximately Within the range.

[0010] In this implementation, the thickness of the second light control layer can be approximately... to approximately and about to approximately Within the range.

[0011] In an implementation, the second light control layer may include an inorganic film or an organic film.

[0012] In an implementation, the second light control layer may include an optically transparent organic film.

[0013] In one embodiment, the second light control layer may include an organic film in which the transmittance in the yellow light wavelength range is less than the transmittance in the blue light wavelength range.

[0014] In an implementation, the second refractive index may be about 1.3 or less.

[0015] In one embodiment, the display panel may include a pixel region and a peripheral region adjacent to the pixel region, and the display panel may include a light-emitting element that generates first light and is disposed in the pixel region. In such an embodiment, the wavelength control layer may include: a partition defining a plurality of openings; a first wavelength control unit disposed in one of the plurality of openings, wherein the first wavelength control unit can convert the first light into second light; and a second wavelength control unit disposed in the other of the plurality of openings, wherein the second wavelength control unit can convert the first light into third light. In such an embodiment, the color filter layer may include: a first color filter portion overlapping the first wavelength control unit, wherein the first color filter portion can transmit second light; and a second color filter portion overlapping the second wavelength control unit, wherein the second color filter portion can transmit third light.

[0016] In one embodiment, a portion of the first color filter section and a portion of the second color filter section may overlap with the partition section.

[0017] In an embodiment, the wavelength control layer may further include a transmissive portion disposed in one of a plurality of openings, wherein the first wavelength control unit and the second wavelength control unit are not disposed, wherein the transmissive portion may transmit first light.

[0018] In one embodiment, the second light control layer may overlap with the transmissive portion, wherein the portion of the second light control layer that overlaps with the transmissive portion may directly contact the cover layer.

[0019] In one embodiment, the first wavelength control unit and the second wavelength control unit may include quantum dots, wherein the transmission part may include a scatterer.

[0020] In an embodiment, the transmissive portion may further include a colorant that transmits the first light and absorbs the second and third light.

[0021] In one embodiment, the thickness of the transmissive portion may be greater than the thickness of the first wavelength control unit and the thickness of the second wavelength control unit.

[0022] In the implementation, the light-emitting element can be an organic light-emitting diode element, a micro light-emitting diode element, or a nano light-emitting diode element.

[0023] In an embodiment of the present invention, a display device includes: a light-emitting element layer for emitting first light; a wavelength control layer disposed on the light-emitting element layer; and a light control component disposed on the wavelength control layer, wherein the light control component includes: an inorganic layer disposed on the wavelength control layer; a first light control layer disposed on the inorganic layer; and a color filter layer disposed on the first light control layer. In such an embodiment, the thickness of the inorganic layer is approximately... to approximately Within the range.

[0024] In an embodiment, the light control component may further include a second light control layer between the first light control layer and the color filter layer, wherein the refractive index of the inorganic layer and the refractive index of the second light control layer may be in the range of about 1.4 to about 1.5.

[0025] In this implementation, the thickness of the second light control layer can be approximately... to approximately and about to approximately Within the range.

[0026] In one embodiment, the wavelength control layer may include: a first wavelength control unit including a first quantum dot that converts the first light into red light; a second wavelength control unit including a second quantum dot that converts the first light into green light; and a transmissive portion including a blue colorant and a scatterer. In such an embodiment, the color filter layer may include: a first color filter portion overlapping the first wavelength control unit, wherein the first color filter portion can transmit red light; and a second color filter portion overlapping the second wavelength control unit, wherein the second color filter portion can transmit green light. Attached Figure Description

[0027] The above and other features of the invention will become more apparent from the further detailed description of embodiments of the invention with reference to the accompanying drawings, in which:

[0028] Figure 1 This is a perspective view of a display device according to an embodiment of the present invention;

[0029] Figure 2 This is an exploded perspective view of a display device according to an embodiment of the present invention;

[0030] Figure 3 yes Figure 2A magnified plan view of a portion of the display area shown;

[0031] Figure 4 This is a cross-sectional view of a display device according to an embodiment of the present invention;

[0032] Figure 5 This is a cross-sectional view of a display device according to an embodiment of the present invention;

[0033] Figure 6 This is a cross-sectional view of a display device according to an embodiment of the present invention;

[0034] Figure 7 This is a graph showing the transmittance of the second light control layer according to an embodiment of the present invention.

[0035] Figure 8 yes Figure 4 An enlarged cross-sectional view of a portion of the display device shown;

[0036] Figure 9 yes Figure 5 An enlarged cross-sectional view of a portion of the display device shown; and

[0037] Figure 10 It is a graph showing the reflectivity of wavelengths according to the implementation method and comparative examples. Detailed Implementation

[0038] The invention will be described more fully below with reference to the accompanying drawings, in which various embodiments are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Throughout the text, the same reference numerals denote the same elements. In the drawings, for the sake of effective description, the thickness, proportions, and dimensions of components are exaggerated.

[0039] In this specification, when a component (or region, layer, part, etc.) is referred to as being “on,” “connected to,” or “bonded to” another component, it means that the component may be directly on, connected to, or bonded to the other component, or that a third component may exist between them. Conversely, when an element is referred to as being “directly on,” “directly connected to,” or “directly bonded to” another element, there is no intermediate element.

[0040] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, “a(a)”, “an”, “the”, and “at least one” do not indicate a limitation of quantity and are intended to include both the singular and the plural unless the context clearly indicates otherwise. For example, “element” has the same meaning as “at least one element” unless the context clearly indicates otherwise. “At least one” should not be construed as limiting “a(a)” or “an”. “Or” means “and / or”. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. It will also be understood that, when used in this specification, the terms “comprise” and / or “comprising” or “include” and / or “including” specify the presence of the stated features, areas, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, areas, integrals, steps, operations, elements, components, and / or groups thereof.

[0041] It will be understood that the terms "first" and "second" are used herein to describe various components, but these components should not be limited by these terms. The terms above are used only to distinguish one component from another. For example, without departing from the scope of the invention, a first component may be referred to as a second component, and a second component may be referred to as a first component. Unless otherwise specified, singular terms may include plural forms.

[0042] Furthermore, relative terms such as “lower” or “bottom” and “upper” or “top” are used herein to describe the relationship between one element and another as shown in the figures. It will be understood that, in addition to the orientations described in the figures, relative terms are intended to also include different orientations of the device. For example, if a device in one of the figures is flipped, an element described as being “below” the other elements will be oriented “above” the other elements. Thus, depending on the specific orientation of the figure, the term “lower” can include both “lower” and “upper” orientations. Similarly, if a device in one of the figures is flipped, an element described as being “below” or “under” the other elements will be oriented “above” the other elements. Thus, the term “below” or “under” can include both “above” and “below” orientations.

[0043] As used herein, “about” or “approximately” includes the value and the average of the value within an acceptable range of deviations from the particular value, as determined by a person of ordinary skill in the art when considering 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%, or ±5% of the value.

[0044] Unless otherwise specified, 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. Generally, terms defined in dictionaries shall be assumed to have the same meaning as in the context of the relevant field and shall not be construed as unusual or overly formal unless expressly defined herein.

[0045] Embodiments are described herein with reference to schematic cross-sectional views as idealized embodiments. Therefore, variations in the illustrated shapes are contemplated, for example, due to manufacturing techniques and / or tolerances. Consequently, the embodiments described herein should not be construed as limited to the specific shapes of the regions shown herein, but rather include deviations in shape, for example, due to manufacturing processes. For instance, regions shown or described as flat may generally have rough and / or non-linear characteristics. Furthermore, sharp corners shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to represent the precise shapes of the regions, nor are they intended to limit the scope of the claims.

[0046] In the following, embodiments of the display device according to the present invention will be described in detail with reference to the accompanying drawings.

[0047] Figure 1 This is a perspective view of a display device according to an embodiment of the present invention.

[0048] In the implementation method, such as Figure 1 As shown, the display device DD can be a portable electronic device. Alternatively, the display device DD can be a medium-sized electronic device such as a personal computer, laptop computer, personal digital assistant, car navigation unit, game console, smartphone, tablet computer, and camera, or a large electronic device such as a television, monitor, or billboard. However, the implementation of the display device DD is not limited to the devices listed above, and the display device DD can be any other electronic device without departing from the scope of the invention.

[0049] The display device DD can be implemented in a hexahedral shape having thickness in a third direction DR3 on a plane defined by a first direction DR1 and a second direction DR2 that intersect each other, but is not limited thereto. Alternatively, the display device DD can have one of various shapes.

[0050] In this paper, the upper (or front) and lower (or rear) surfaces of each component are defined based on the orientation in which the image IM is displayed. The upper and lower surfaces may be opposite each other on a third direction DR3, and the normal directions of the upper and lower surfaces may be parallel to the third direction DR3 and the fourth direction DR4. Here, the fourth direction DR4 is the direction opposite to the third direction DR3.

[0051] In this document, the directions indicated by the first direction DR1, the second direction DR2, the third direction DR3, and the fourth direction DR4 are relative concepts and can be converted to other directions. In the following text, the first to fourth directions refer to the same reference numerals in the directions indicated by the first direction DR1, the second direction DR2, the third direction DR3, and the fourth direction DR4, respectively.

[0052] The display device DD can display an image IM via a display surface IS. The display surface IS includes a display area DA for displaying the image IM and a non-display area NDA adjacent to the display area DA. The non-display area NDA is the area on which no image is displayed. The image IM can be a moving image or a static image. In an embodiment, such as... Figure 1 As shown, an image IM can include multiple application icons and a clock.

[0053] The display area DA can have a rectangular shape. The non-display area NDA can surround the display area DA. However, the invention is not limited to this, and the form of the display area DA and the non-display area NDA can be modified in various ways. In an embodiment, the non-display area NDA on the front surface of the display device DD can be omitted.

[0054] In one embodiment, the display device DD can be flexible. In such an embodiment, the display device DD can have properties that allow it to bend, ranging from a fully foldable structure to a structure that can be bent at a level of a few nanometers. In one embodiment, for example, the display device DD can be a flexible display device or a foldable display device. However, the invention is not limited thereto, and alternatively, the display device DD can be rigid.

[0055] Figure 2 This is an exploded perspective view of the display device according to the embodiment.

[0056] Reference Figure 2The implementation of the display device DD may include a display panel DP, a wavelength control layer WCL, a light control component LP, and a cover layer CV arranged sequentially along the third direction DR3.

[0057] In this embodiment, the display panel DP may include a plurality of pixels PX in an area corresponding to the display area DA of the display device DD. The plurality of pixels PX may be arranged to be spaced apart from each other in the display area DA. The pixels PX can display an image IM on the display area DA by outputting light with color information based on electrical signals. The plurality of pixels PX may be related to the pixel area PXA (see [link to relevant documentation]). Figure 3 Corresponding to.

[0058] In one embodiment, the display panel DP can be a light-emitting display panel. In one embodiment, for example, the display panel DP can be an organic light-emitting display panel, a quantum dot light-emitting display panel, a micro-light-emitting diode (“LED”) display panel, or a nano-LED display panel. The light-emitting layer of an organic light-emitting display panel can include organic light-emitting materials. The light-emitting layer of a quantum dot light-emitting display panel can include quantum dots and / or quantum rods. A micro-LED display panel can include micro-LED elements as ultra-small light-emitting elements, and a nano-LED display panel can include nano-LED elements.

[0059] In this implementation, a wavelength control layer (WCL) can be disposed on the display panel (DP). The wavelength control layer (WCL) transmits light output from the display panel (DP), or converts light from the display panel (DP) into light with different wavelengths to output light of various colors.

[0060] In one embodiment, the light control component LP can be disposed on the wavelength control layer WCL. The light control component LP can increase the light conversion efficiency by reflecting light transmitted through the wavelength control layer WCL back to the wavelength control layer WCL. In such an embodiment, the light control component LP can improve the visibility of the light provided by the wavelength control layer WCL by reducing the reflectivity of light incident from the outside onto the display device DD.

[0061] In this implementation, a cover layer CV may be disposed on the light control component LP. The cover layer CV can protect components disposed beneath it from external factors. The cover layer CV may include glass.

[0062] Figure 3 yes Figure 2 The image shows a magnified view of a portion of the display area DA. The display area DA may include a pixel area PXA and a peripheral area NPXA adjacent to the pixel area PXA.

[0063] For ease of explanation and description, Figure 3The three types of pixel regions, PXA1, PXA2, and PXA3, are mainly shown. Figure 3 The three types of pixel regions PXA1, PXA2, and PXA3 shown can be repeatedly set throughout the entire display area DA. The peripheral area NPXA can set the boundary between the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 to prevent color mixing between the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3.

[0064] In the implementation method, such as Figure 3 As shown, the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 may have the same planar area as each other, but are not limited thereto. Alternatively, the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 may have different areas from each other, or only one or two of the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 may have different areas from each other. The shape of the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 is not limited to the rectangular shape shown, and may have another shape such as a polygon.

[0065] One of the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 provides a first light to the user, another provides a second light different from the first light, and the remaining one provides a third light different from the first and second light. In one embodiment, for example, the first pixel region PXA1 provides red light, the second pixel region PXA2 provides green light, and the third pixel region PXA3 provides blue light.

[0066] Each of the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 is compatible with pixel PX (see [link]). Figure 2 Correspondingly, the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 can provide or emit light of different colors based on the electrical signals applied to them. Therefore, multiple pixels PX corresponding to the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3 can output light with color information.

[0067] Figures 4 to 6 It is along Figure 3 A cross-sectional view of the display device DD according to the embodiment, taken along line I-I'. Figures 4 to 6Each embodiment of the display device DD shown includes a display panel DP, a cover layer CV, a light control component LP-a or LP-b, and a wavelength control layer WCL. In addition to the wavelength control layer WCL and the light control component LP-a or LP-b, Figures 4 to 6 The embodiments of the display device DD shown have substantially the same configuration as each other. In the following text, reference will be made to... Figures 4 to 6 Description of embodiments of the present invention.

[0068] In an implementation, the display panel DP may include a substrate layer BL, a circuit layer DP-CL, and a light-emitting element layer DP-EDL, stacked sequentially along the third direction DR3. Pixel regions PXA1, PXA2, and PXA3, and a peripheral region NPXA adjacent to pixel regions PXA1, PXA2, and PXA3 may be defined within the display panel DP. Figures 4 to 6 The image shows three types of pixel regions: the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3.

[0069] The substrate layer BL included in the display panel DP can be rigid or flexible. The substrate layer BL can be a polymer substrate, plastic substrate, glass substrate, metal substrate, or composite material substrate. In one embodiment, for example, the substrate layer BL can be a flexible substrate comprising polyimide resin. However, the materials included in the substrate layer BL are not limited to the materials described above.

[0070] The circuit layer DP-CL can be disposed on the substrate layer BL. The circuit layer DP-CL may include multiple transistors (not shown). Each of the transistors (not shown) may include a control electrode, an input electrode, and an output electrode. In one embodiment, for example, the circuit layer DP-CL may include a switching transistor and a driving transistor for driving the light-emitting element EDL.

[0071] The light-emitting element layer DP-EDL can be disposed on the circuit layer DP-CL. The light-emitting element layer DP-EDL may include a pixel defining film PDL, a light-emitting element EDL, and a packaging layer TFE. The light-emitting element layer DP-EDL can display an image by emitting light corresponding to electrical signals transmitted through a plurality of transistors (not shown) included in the circuit layer DP-CL.

[0072] The light-emitting element (EDL) can be disposed in pixel regions PXA1, PXA2, and PXA3. The EDL may include a first electrode EL1, a second electrode EL2, and a light-emitting layer (EML). The first electrode EL1 and the second electrode EL2 can be positioned opposite each other. The EML can be disposed between the first electrode EL1 and the second electrode EL2.

[0073] The light-emitting element (EDL) can generate light by activating the light-emitting layer (EML) based on the potential difference between the first electrode EL1 and the second electrode EL2. The light-emitting element (EDL) can be an organic light-emitting diode (“OLED”) element, a micro LED element, or a nano LED element.

[0074] The light-emitting layer (EML) can include organic light-emitting materials, inorganic light-emitting materials, etc., and can include micron- or nano-scale light-emitting bodies or units. The light-emitting element (EDL) can generate first light by recombination of holes and electrons injected from the first electrode EL1 and the second electrode EL2 in the EML.

[0075] The first light can be blue light. Blue light can be light in the wavelength range of approximately 410 nanometers (nm) to approximately 480 nm, but is not limited to this, and can be light in the wavelength range that is perceived as blue. However, the first light is not limited to blue light, but can be designed to be light of one of a variety of colors.

[0076] Although not shown in the figure, the light-emitting element (EDL) may also include a hole transport region and an electron transport region. The hole transport region may be disposed between the light-emitting layer (EML) and the first electrode (EL1), and the electron transport region may be disposed between the light-emitting layer (EML) and the second electrode (EL2). The hole transport region transports holes injected from the first electrode (EL1) to the light-emitting layer (EML). The electron transport region transports electrons injected from the second electrode (EL2) to the light-emitting layer (EML). In embodiments, each of the light-emitting layer (EML), electron transport region, and hole transport region may be provided in multiples, but is not limited thereto.

[0077] A pixel-defining film (PDL) can be disposed on the circuit layer DP-CL. Predetermined openings can be defined within the pixel-defining film (PDL). The openings defined in the pixel-defining film (PDL) can correspond to pixel regions PXA1, PXA2, and PXA3, respectively. The pixel-defining film (PDL) can also correspond to the peripheral region NPXA.

[0078] Pixel defining film (PDL) may include organic resins or inorganic materials. In one embodiment, for example, the pixel defining film (PDL) may include polyacrylate-based resin, polyimide-based resin, or silicon nitride (SiN). x ), silicon dioxide (SiO) x ) or silicon oxynitride (SiO) x N y ), or made of polyacrylate resin, polyimide resin, silicon nitride (SiN) x ), silicon dioxide (SiO) x ) or silicon oxynitride (SiO) x N y )form.

[0079] A TFE encapsulation layer can be applied to the LED (Electronic Light Discharge) element to seal it. The TFE protects the LED from moisture / oxygen and from foreign substances such as dust particles.

[0080] The encapsulation layer TFE may comprise an organic membrane or an inorganic membrane. In one embodiment, for example, the encapsulation layer TFE may comprise an organic membrane OL and inorganic membranes IL1 and IL2. The encapsulation layer TFE may have a structure in which the organic membrane OL and the inorganic membranes IL1 and IL2 are stacked alternately on top of each other.

[0081] The inorganic films IL1 and IL2 included in the encapsulation layer TFE may include, for example, a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer, but are not limited thereto. The organic film OL included in the encapsulation layer TFE may include an acrylic-based organic film, but is not limited thereto.

[0082] The display device DD may include a cover layer CV, a light control component LP-a or LP-b, a wavelength control layer WCL, and a capping layer CP disposed on the display panel DP. The cover layer CV, the light control component LP-a or LP-b, the wavelength control layer WCL, and the capping layer CP may be sequentially disposed on the display panel DP in the fourth direction DR4.

[0083] A cover layer (CV) can be disposed on the display panel (DP). The cover layer (CV) can protect the components disposed beneath it. The cover layer (CV) serves as a substrate for forming the light control component LP-a or LP-b and the wavelength control layer (WCL), which can be disposed between the cover layer (CV) and the display panel (DP). The cover layer (CV) may include glass.

[0084] The light control component LP-a or LP-b can be disposed on the cover layer CV in the fourth direction DR4. The light control component LP-a or LP-b can reduce the external light reflectivity of the display device DD and improve the light output efficiency. Each of the light control components LP-a and LP-b may include a color filter layer CFL, a light control layer LL1 or LL2, and an inorganic layer IO.

[0085] A color filter layer CFL can be disposed on a capping layer CV in the fourth direction DR4. The color filter layer CFL can be directly disposed on the capping layer CV. The color filter layer CFL can have a patterned structure formed on the capping layer CV. The color filter layer CFL can reduce the reflection of external light and prevent color mixing. The color filter layer CFL may include a first color filter portion CF1 and a second color filter portion CF2. Each of the color filter portions CF1 and CF2 can transmit only light within a specific wavelength range and absorb light within the remaining wavelength range.

[0086] The second color filter section CF2 can be disposed on the cover layer CV in the fourth direction DR4. The front surface of the second color filter section CF2 can directly contact the cover layer CV. The second color filter section CF2 can be formed on a portion of the cover layer CV. The second color filter section CF2 can be arranged to overlap with some of the pixel regions among a plurality of pixel regions. (Refer to...) Figures 4 to 6 The second color filter section CF2 may overlap with the second pixel region PXA2. A portion of the second color filter section CF2 may overlap with the peripheral region NPXA.

[0087] The second color filter section CF2 can transmit third light and block the first and second light, the third light having a wavelength range different from that of the first light provided by the light-emitting element EDL. In one embodiment, for example, the third light can be green light. Green light can be light in the wavelength range of about 495 nm to about 570 nm, but is not limited thereto, and can include wavelengths identified as green. The second color filter section CF2 can include green pigment or green dye.

[0088] A first color filter portion CF1 can be disposed on the cover layer CV in the fourth direction DR4. A portion of the first color filter portion CF1 can be in direct contact with the cover layer CV, and another portion can be in contact with a portion of the second color filter portion CF2. The first color filter portion CF1 can be formed in a portion of the cover layer CV on which the second color filter portion CF2 is formed. The first color filter portion CF1 can be arranged to overlap with some of the pixel regions among a plurality of pixel regions. (Refer to...) Figures 4 to 6 The first color filter section CF1 may overlap with the first pixel region PXA1, which does not overlap with the second color filter section CF2. A portion of the first color filter section CF1 may overlap with the peripheral region NPXA.

[0089] The first color filter section CF1 can transmit second light and block the first and third light, the second light having a different wavelength range than the first light provided by the light-emitting element EDL. In one embodiment, for example, the second light can be red light. Red light can be light having a wavelength range of about 620 nm to about 750 nm, but is not limited thereto, and can include wavelengths identified as red. The first color filter section CF1 can include red pigment or red dye.

[0090] A portion of the first color filter section CF1 and a portion of the second color filter section CF2 can be configured to overlap with the peripheral region NPXA. The overlap of the first color filter section CF1 with the peripheral region NPXA covers a portion of the lower surface of the second color filter section CF2. The first color filter section CF1 can block both the first and third light rays, and the second color filter section CF2 can block both the first and second light rays. Therefore, the overlapping portion of the first color filter section CF1 and the second color filter section CF2 can serve as a light-shielding layer and effectively prevent light leakage.

[0091] In an alternative embodiment, although not shown in the figures, the color filter layer CFL may also include a light-shielding portion comprising a light-shielding material. The light-shielding portion may be configured to overlap with the peripheral region NPXA. Multiple color filter portions may be spaced apart from each other, with adjacent light-shielding portions interposed between them. Therefore, the light-shielding portion can serve as the boundary between the color filter portions.

[0092] The color filter layer (CFL) does not need to be placed on certain areas of the overlay layer (CV). The color filter layer (CFL) does not need to be placed in areas that overlap with some pixel regions among multiple pixel regions. (See reference...) Figures 4 to 6 The color filter section (e.g., CF1 or CF2) is not located in the area overlapping with the third pixel area PXA3. Therefore, the first color filter section CF1 and the second color filter section CF2 can not overlap with the third pixel area PXA3 on the third-direction DR3.

[0093] The light control layer LL1 or LL2 can be disposed on the color filter layer CFL in the fourth direction DR4. Depending on the embodiment of the light control component, it may include a single light control layer, or it may include multiple light control layers having different refractive indices from each other. Figure 4 An embodiment in which the optical control component LP-a includes a single optical control layer (e.g., a first optical control layer LL1) is shown, and Figure 5 An embodiment in which the light control component LP-b includes multiple light control layers (e.g., a first light control layer LL1 and a second light control layer LL2) is shown.

[0094] The first light control layer LL1 can be set on the color filter layer CFL in the fourth direction DR4, and refer to Figure 4 The first light control layer LL1 can be directly disposed on the lower surface of the color filter layer CFL. The first light control layer LL1 can be disposed on the cover layer CV, which has the first color filter section CF1 and the second color filter section CF2, to cover the lower surfaces of the first color filter section CF1 and the second color filter section CF2. In areas where no color filter sections are disposed, the first light control layer LL1 can directly contact the cover layer CV.

[0095] Compared to other stacked structures, the first light control layer LL1 can have a relatively low refractive index. In one embodiment, for example, the refractive index of the first light control layer LL1 can be about 1.3 or less. The first light control layer LL1 can utilize the difference in refractive index to reflect light supplied through the display panel DP at a wider angle and improve the viewing angle.

[0096] The wavelength control layer (WCL) can be positioned below the first light control layer (LL1). The WCL converts the light provided by the display panel (DP) into light within different wavelength ranges and provides various colors of light. The first light control layer (LL1) can increase the wavelength conversion efficiency by utilizing differences in refractive index to reflect light that has not undergone wavelength conversion back to the WCL.

[0097] The first light control layer LL1 may include an organic film and may also include inorganic particles contained within the organic film. In one embodiment, for example, the organic film may include acrylic acid, polysiloxane, polyurethane, polyimide, etc., and the inorganic particles may include silica, etc., but are not limited thereto.

[0098] The inorganic layer IO can be disposed on the first optical control layer LL1 in the fourth direction DR4. The inorganic layer IO can be directly disposed on the first optical control layer LL1 and can cover the lower surface of the first optical control layer LL1. The wavelength control layer WCL can be disposed below the inorganic layer IO.

[0099] The refractive index of the inorganic layer IO can be less than that of the wavelength control layer WCL, but greater than that of the first optical control layer LL1. The inorganic layer IO can reduce the difference between the refractive index of the first optical control layer LL1 and the refractive index of the wavelength control layer WCL, thereby reducing the amount of reflected light and reducing external light reflection. In one embodiment, for example, the refractive index of the inorganic layer IO can be in the range of about 1.4 to about 1.5.

[0100] The inorganic layer IO may include an inorganic material that satisfies the above-described refractive index relationship. In one embodiment, for example, the inorganic layer IO may include silicon oxide (SiO2). x However, it is not limited to this.

[0101] The inorganic layer IO can have a specific thickness to reduce light reflectivity within a specific wavelength range. The reflectivity of light incident on the inorganic layer IO can be repeatedly increased and decreased according to the wavelength. The wavelength range in which the reflectivity decreases can be varied according to the thickness of the inorganic layer IO. Therefore, the light reflectivity in the visible light region can be reduced by adjusting the thickness of the inorganic layer IO. In one embodiment, for example, the thickness of the inorganic layer IO can be approximately 2.5 kiloangeros. to approximately Within the range.

[0102] Reference Figure 5 In an alternative embodiment, the light control component LP-b may further include a second light control layer LL2. The second light control layer LL2 may be disposed between the color filter layer CFL and the first light control layer LL1. Therefore, the second light control layer LL2 may be directly disposed on the lower surface of the color filter layer CFL, and the first light control layer LL1 may be directly disposed on the lower surface of the second light control layer LL2. In areas where no color filter portion is disposed, the second light control layer LL2 may directly contact the cover layer CV. The second light control layer LL2 may be disposed on or formed on the cover layer CV where the first color filter portion CF1 and the second color filter portion CF2 are disposed, to cover the lower surfaces of the first color filter portion CF1 and the second color filter portion CF2.

[0103] The external light visibility of the display device DD can be improved by adjusting the refractive index or thickness of the second light control layer LL2. The refractive index of the second light control layer LL2 can be less than that of the color filter layer CFL, but greater than that of the first light control layer LL1. The second light control layer LL2 can reduce the difference between the refractive index of the first light control layer LL1 and the refractive index of the color filter layer CFL, thereby reducing the amount of reflected light and reducing external light reflection. In one embodiment, for example, the refractive index of the second light control layer LL2 can be in the range of about 1.4 to about 1.5.

[0104] The second light control layer LL2 may include an inorganic film that satisfies the above-described refractive index relationship. In one embodiment, for example, the inorganic film may be silicon oxide (SiO2). x Inorganic membranes. However, the materials for inorganic membranes are not limited to this.

[0105] The second light control layer LL2 may include an organic film that satisfies the above refractive index relationship. The second light control layer LL2 may include an optically transparent organic film.

[0106] The organic film included in the second light control layer LL2 can have transmittance in the yellow light wavelength range, which is less than the transmittance in the blue light wavelength range. In one embodiment, for example, the organic film included in the second light control layer LL2 can have transmittance in the wavelength range of about 560 nm to about 630 nm, which is less than the transmittance in the wavelength range of about 450 nm to about 500 nm. However, the wavelength range is not limited to this, and the yellow light wavelength range and the blue light wavelength range can respectively include wavelength ranges identified as yellow and blue.

[0107] In one embodiment, for example, the transmittance of the second light control layer LL2 can have the same as that of the second light control layer LL2. Figure 7 The curves shown exhibit the same trend, and will be referenced later. Figure 7A detailed description follows. When the second light control layer LL2 includes the aforementioned organic film, the external light reflectivity of the display device DD can be reduced more effectively.

[0108] By controlling the thickness of the second light control layer LL2, the effect of reducing external light reflectivity can be improved. Light reflected at the interface between the color filter layer CFL and the second light control layer LL2 and light reflected at the interface between the inorganic layer IO and the wavelength control layer WCL can be destructively interfered, and the degree of destructive interference can vary depending on the thickness of the second light control layer LL2 and the inorganic layer IO. In embodiments where the second light control layer LL2 comprises an inorganic film, the external light reflection effect controlled by the thickness can be greater. In one embodiment, for example, the thickness of the second light control layer LL2 can be approximately... to approximately and about to approximately Within the range.

[0109] Reference Figures 4 to 6 The wavelength control layer (WCL) can be disposed on the inorganic layer (IO) in the fourth direction (DR4). The wavelength control layer (WCL) can be in direct contact with the inorganic layer (IO), thereby protecting the upper surface of the wavelength control layer (WCL) from moisture, oxygen, or foreign substances.

[0110] The wavelength control layer (WCL) can transmit light provided by the light-emitting element (EDL), or convert the light provided by the EDL into light with different wavelength ranges. The wavelength control layer (WCL) can provide light with different colors corresponding to the first pixel region PXA1, the second pixel region PXA2, and the third pixel region PXA3.

[0111] The wavelength control layer WCL may include a partition BK having multiple openings therein, a first wavelength control unit WC1, and a second wavelength control unit WC2. The wavelength control layer WCL may also include a transmission section TP.

[0112] The separator BK can be disposed on the lower surface of the inorganic layer IO. The separator BK can directly contact the inorganic layer IO. After placing the light control component LP-a or LP-b on the cover layer CV, the separator BK, which defines a plurality of openings, can be provided or formed on the light control component LP-a or LP-b. The separator BK can overlap with the peripheral region NPXA. The separator BK can prevent light leakage and define the boundary between adjacent wavelength control units WC1 and WC2 and the transmissive portion TP. The separator BK can include an organic material. The separator BK can include an organic light-shielding material containing black pigment or dye.

[0113] A portion of the first color filter section CF1 and a portion of the second color filter section CF2 may overlap with the separator section BK. A portion of the first color filter section CF1 and a portion of the second color filter section CF2 may contact each other on the separator section BK.

[0114] The first wavelength control unit WC1 can be disposed in one of the plurality of openings defined in the partition BK, and the second wavelength control unit WC2 can be disposed in another of the plurality of openings. In such an embodiment, the second wavelength control unit WC2 can be disposed in an opening of the partition BK in which the first wavelength control unit WC1 is not disposed.

[0115] In an embodiment, the wavelength control layer WCL may further include a transmissive portion TP. The transmissive portion TP may be disposed in one of a plurality of openings defined in the partition portion BK. The transmissive portion TP may be disposed in an opening of the partition portion BK in which the first wavelength control unit WC1 and the second wavelength control unit WC2 are not disposed. Therefore, when viewed in a plane defined by the first direction DR1 and the second direction DR2, each of the first wavelength control unit WC1, the second wavelength control unit WC2, and the transmissive portion TP is spaced apart from each other.

[0116] The first wavelength control unit WC1 and the second wavelength control unit WC2 can be located below the inorganic layer IO. The first wavelength control unit WC1 and the second wavelength control unit WC2 can be in direct contact with the inorganic layer IO.

[0117] The first wavelength control unit WC1 can be arranged to overlap with the first pixel region PXA1. The first wavelength control unit WC1 can overlap with the first color filter section CF1. The first wavelength control unit WC1 can convert the first light provided by the display panel DP into second light with a different wavelength range. In one embodiment, for example, the second light can be red light. Therefore, the first pixel region PXA1 can provide red light.

[0118] The first wavelength control unit WC1 may include a substrate resin and quantum dots QD1. The quantum dots QD1 may be dispersed in the substrate resin included in the first wavelength control unit WC1. The quantum dots QD1 included in the first wavelength control unit WC1 may be particles that convert first light into second light within a different wavelength range.

[0119] The second wavelength control unit WC2 can be arranged to overlap with the second pixel region PXA2. The second wavelength control unit WC2 can also overlap with the second color filter section CF2. The second wavelength control unit WC2 can convert the first light provided by the display panel DP into a third light within a different wavelength range. In one embodiment, for example, the third light can be green light. Therefore, the second pixel region PXA2 can provide green light.

[0120] The second wavelength control unit WC2 may include a substrate resin and quantum dots QD2. The quantum dots QD2 may be dispersed within the substrate resin included in the second wavelength control unit WC2. The quantum dots QD2 included in the second wavelength control unit WC2 may be particles that convert first light into third light within a different wavelength range.

[0121] The quantum dots QD1 and QD2 included in the wavelength control units WC1 and WC2 can be semiconductor nanocrystals, including at least one material selected from group II-VI compounds, group III-VI compounds, group III-V compounds, group IV-VI compounds, group IV elements or compounds, group I-III-VI compounds, and combinations thereof.

[0122] Group II-VI compounds may include: dielemental compounds selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS and combinations thereof (e.g., compounds); and compounds selected from CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe Tri-element compounds consisting of CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, MgZnSe, MgZnS and combinations thereof; and tetra-element compounds selected from CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe and combinations thereof.

[0123] Group III-VI compounds may include dielemental compounds such as In2S3 and In2Se3, ternary compounds such as InGaS3 and InGaSe3, or any combination thereof.

[0124] Group III-V compounds may include: binary compounds selected from GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and combinations thereof; ternary compounds selected from GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InGaP, InAlP, InNP, InNAs, InNSb, InPAs, InPSb and combinations thereof; and tetraelement compounds selected from GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, InAlPSb and combinations thereof.

[0125] III-V group (semiconductor) compounds may also include group II metals such as InZnP.

[0126] Group IV-VI compounds may include: dielemental compounds selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, and combinations thereof; trielemental compounds selected from SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, and combinations thereof; and tetraelemental compounds selected from SnPbSSe, SnPbSeTe, SnPbSTe, and combinations thereof. Group IV elements may include Si, Ge, and combinations thereof. Group IV compounds may include dielemental compounds selected from SiC, SiGe, and combinations thereof.

[0127] Group I-III-VI (semiconductor) compounds may include AgInS, AgInS2, CuInS, CuInS2, CuGaO2, AgGaO2, AgAlO2, etc., or any combination thereof.

[0128] In such an implementation, the two-element, three-element, or four-element compounds can exist in the particles at a uniform concentration, or they can exist in the same particles by dividing the concentration distribution into partially different states.

[0129] In one embodiment, quantum dots QD1 and QD2 may have a core-shell structure comprising a core and a shell surrounding the core. In another embodiment, a quantum dot may have a core / shell structure surrounding other quantum dots. In the core-shell structure, the concentration of the element present in the shell may have a concentration gradient decreasing towards the core.

[0130] In implementation, the shells of quantum dots QD1 and QD2 may include metal or non-metal oxides, semiconductor compounds, or combinations thereof.

[0131] In one embodiment, for example, the metal or non-metal oxide used in the shell may include binary compounds such as SiO2, Al2O3, TiO2, ZnO, MnO, Mn2O3, Mn3O4, CuO, FeO, Fe2O3, Fe3O4, CoO, Co3O4, NiO, etc., or ternary compounds such as MgAl2O4, CoFe2O4, NiFe2O4, CoMn2O4, etc., but the present invention is not limited thereto.

[0132] In addition, semiconductor compounds may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnSeS, ZnTeS, GaAs, GaP, GaSb, HgS, HgSe, HgTe, InAs, InP, InGaP, InSb, AlAs, AlP, AlSb, etc., but the present invention is not limited thereto.

[0133] Quantum dots QD1 and QD2 can control the color of emitted light based on their particle size, and therefore can possess various cool light colors such as green and red. As the particle size of quantum dots QD1 and QD2 becomes smaller, they can emit light in the short wavelength region. In one embodiment, for example, the particle size of the quantum dot emitting green light can be smaller than the particle size of the quantum dot emitting red light.

[0134] The transmissive portion TP can be disposed below the inorganic layer IO. The transmissive portion TP can be in direct contact with the inorganic layer IO. The transmissive portion TP can be arranged to overlap with the third pixel region PXA3. The color filter portion may not be disposed on the transmissive portion TP. The transmissive portion TP can transmit first light provided by the display panel DP. In one embodiment, for example, the first light can be blue light. Therefore, the third pixel region PXA3 can provide blue light.

[0135] The transmissive portion TP may include a base resin and a diffuser SP. The base resin included in the transmissive portion TP may be a transparent resin. The diffuser SP may be dispersed in the base resin included in the transmissive portion TP.

[0136] A scatterer SP scatters incident light in various directions to increase light output efficiency. The scatterer SP may include a light-reflecting material or a material having a predetermined refractive index. In one embodiment, for example, the scatterer SP may include at least one selected from TiO2, ZrO3, Al2O3, SiO2, MgO, In2O3, ZnO, SnO2, Sb2O3, SiO2, and indium tin oxide (“ITO”).

[0137] In embodiments, although not shown in the figures, wavelength control units WC1 and WC2 may further include a scatterer SP. The scatterer SP may be dispersed in a base resin included in each of the first wavelength control unit WC1 and the second wavelength control unit WC2. The scatterer SP may be included in each of the first wavelength control unit WC1, the second wavelength control unit WC2, and the transmissive portion TP. However, the invention is not limited thereto, and the scatterer SP may be included in only one of the first wavelength control unit WC1, the second wavelength control unit WC2, and the transmissive portion TP.

[0138] The thickness of the transmissive portion TP can be greater than the thickness of the first wavelength control unit WC1 and the second wavelength control unit WC2. Since the color filter portion is not placed on the transmissive portion TP, a step can be defined or formed on the light control member LP-a or LP-b, and the thickness of the transmissive portion TP can be greater than the thickness of the first wavelength control unit WC1 and the second wavelength control unit WC2 to reduce the difference in the step.

[0139] Reference Figure 6 In an alternative embodiment, the transmissive portion TP may further include a colorant CM. The colorant CM may be dispersed in a base resin included in the transmissive portion TP. The colorant CM may transmit light within a specific wavelength range. The colorant CM transmits first light provided by the display panel DP and absorbs second and third light having wavelength ranges different from the first light. In one embodiment, for example, the colorant CM may transmit blue light and absorb red and green light. The colorant CM may be a blue colorant and may include a blue pigment or blue dye.

[0140] After providing or forming optical control components LP-a or LP-b on the cover layer CV, the wavelength control layer WCL can be provided or formed by the following steps: forming a partition BK in which a plurality of openings are defined on the optical control components LP-a or LP-b; providing a first wavelength control unit WC1 in some of the plurality of openings; placing a second wavelength control unit WC2 in another portion of the plurality of openings; and providing a transmissive portion TP in the remaining portion of the plurality of openings. The first wavelength control unit WC1, the second wavelength control unit WC2, and the transmissive portion TP can be formed using an inkjet process.

[0141] A capping layer CP can be disposed between the wavelength control layer WCL and the encapsulation layer TFE. The capping layer CP can be disposed on the lower surface of the wavelength control layer WCL to cover it. The capping layer CP can protect the wavelength control layer WCL from oxygen, moisture, and foreign substances. The capping layer CP can include at least one selected from silicon oxide, titanium oxide, and aluminum oxide, but is not limited thereto. In an alternative embodiment of the display device DD according to the present invention, the capping layer CP can be omitted.

[0142] In one embodiment, the display device DD can be manufactured by sequentially stacking light control components LP-a or LP-b, a wavelength control layer WCL, and a capping layer CP on a cover layer CV along one direction, and arranging the stacked structure such that the capping layer CP faces the encapsulation layer TFE, but is not limited thereto. Embodiments of the display device DD of the present invention can be manufactured using methods different from those described above.

[0143] Figure 7 A graph showing the transmittance of the second light control layer LL2 according to an embodiment is shown. The second light control layer LL2 may include an organic film in which the transmittance in the yellow light wavelength range is less than the transmittance in the blue light wavelength range. In one embodiment, for example, the transmittance of the second light control layer LL2 may exhibit the following characteristics: Figure 7 The trend is shown in the curve graph.

[0144] Reference Figure 7 For light with wavelengths of approximately 500 nm or greater, the transmittance of the second light control layer LL2 gradually decreases, and can have a value of 70% or less in the wavelength range of approximately 565 nm to approximately 775 nm. In particular, in the wavelength range of 590 nm to 630 nm, the transmittance can have a value of 60% or less.

[0145] In one embodiment, an organic film having transmittance in the yellow light wavelength range (less than that in the blue light wavelength range) is included in the second light control layer LL2, thereby reducing the transmittance of light with wavelengths of approximately 550 nm or greater in the visible light region. Therefore, in this embodiment, by including the second light control layer LL2, the external light reflectivity of the display device DD can be reduced more effectively. However, Figure 7 The graphs shown are merely examples, and the organic films included in the second light control layer LL2 are not limited to those having the following characteristics. Figure 7 The transmittance values ​​shown are as follows.

[0146] Figure 8 yes Figure 4 An enlarged cross-sectional view of part AA of the display device DD shown. Figure 9 yes Figure 5 An enlarged cross-sectional view of part BB of the display device DD shown. Figure 8 and Figure 9 An enlarged cross-sectional view of the first pixel region PXA1, in which the first color filter section CF1 is provided, is shown. However, the following description is applicable to regions corresponding to other pixel regions (e.g., the second pixel region PXA2 and the third pixel region PXA3).

[0147] The speed of light can be altered or changed by the medium it passes through. When a light wave encounters an interface between media with different refractive indices, some is transmitted, while some is reflected. The reflected light may or may not change phase depending on the refractive index of the medium.

[0148] Reference Figure 8 The upper surface of the first light control layer LL1 contacts the first color filter portion CF1, and the lower surface of the first light control layer LL1 contacts the inorganic layer IO. The upper surface of the inorganic layer IO contacts the first light control layer LL1, and the lower surface of the inorganic layer IO contacts the first wavelength control unit WC1.

[0149] The inorganic layer IO may have a first refractive index n1, and the first light control layer LL1 may have a second refractive index n2. The second refractive index n2 may be less than the refractive index of the first color filter section CF1 and the first refractive index n1. In an embodiment, the second refractive index n2 may be less than the refractive indices of the first color filter section CF1 and the first wavelength control unit WC1 to improve the viewing angle and increase wavelength conversion efficiency. The first refractive index n1 may be greater than the second refractive index n2 and less than the refractive index of the first wavelength control unit WC1.

[0150] Regarding the light L1 incident on a portion of the display device DD, some light L1-1 can be transmitted at the interface between the first color filter section CF1 and the first light control layer LL1, and some light RL1-1 can be reflected. Some light L1-2 of the light L1-1 transmitted through the first light control layer LL1 can pass through the inorganic layer IO, and some of the light L1-2 can be reflected. Some light RL1-2 of the light L1-2 transmitted into the inorganic layer IO can be reflected at the interface between the inorganic layer IO and the first wavelength control unit WC1.

[0151] The greater the difference in refractive index, the smaller the critical angle for total internal reflection, and the greater the amount of light reflected. Therefore, the amount of reflected light can be reduced by arranging an inorganic layer IO having a refractive index value between the second refractive index n2 and the refractive index of the first wavelength control unit WC1. The difference in refractive index between the first refractive index n1 and the first wavelength control unit WC1 can be smaller than the difference in refractive index between the second refractive index n2 and the first wavelength control unit WC1, so that the amount of light RL1-2 reflected at the interface between the inorganic layer IO and the first wavelength control unit WC1 can be less than when the inorganic layer IO is not provided.

[0152] In this implementation, the thickness D1 of the inorganic layer IO can affect the light reflectivity according to the wavelength range. The thickness D1 of the inorganic layer IO can be adjusted to reduce the light reflectivity in the wavelength range of the visible light region, and the thickness D1 can be approximately... to approximately Within the range.

[0153] Reference Figure 9 The light control component LP-b may further include a second light control layer LL2. The upper surface of the first light control layer LL1 contacts the second light control layer LL2, and the first color filter portion CF1 contacts the upper surface of the second light control layer LL2.

[0154] The second light control layer LL2 may have a third refractive index n3. The third refractive index n3 may be less than the refractive index of the first color filter section CF1 and greater than the second refractive index n2.

[0155] Regarding the light L1 incident on a portion of the display device DD, some light L2-1 can be transmitted at the interface between the first color filter section CF1 and the second light control layer LL2, and some light RL2-1 can be reflected. Some light L2-2 of the light L2-1 transmitted through the second light control layer LL2 can pass through the first light control layer LL1, and some light L2-2 can be reflected. Some light L2-3 of the light L2-2 transmitted into the first light control layer LL1 can pass through the inorganic layer IO, and some light RL2-2 can be reflected at the interface between the inorganic layer IO and the first wavelength control unit WC1.

[0156] In this embodiment, since the difference between the refractive index of the first color filter section CF1 and the third refractive index n3 is smaller than the difference between the refractive index of the first color filter section CF1 and the second refractive index n2, the amount of light L2-1 transmitted from the interface between the first color filter section CF1 and the second light control layer LL2 can be greater than the amount of light L1-1 transmitted from the interface between the first color filter section CF1 and the first light control layer LL1 (see...). Figure 8The amount of reflected light RL2-1 from the interface between the first color filter section CF1 and the second light control layer LL2 can be less than the amount of reflected light RL1-1 from the interface between the first color filter section CF1 and the first light control layer LL1 (see...). Figure 8 The amount of ).

[0157] When wavelengths are out of phase, light with opposite phases can cancel each other out, and the external light reflectivity can be reduced by the destructive interference effect. The reflected light RL2-1 and RL2-2 at each interface can cancel each other out according to their phases. The destructive interference effect can be maximized by adjusting the thickness D1 of the inorganic layer IO and the thickness D2 of the second light control layer LL2. In one embodiment, for example, the thickness D1 of the inorganic layer IO can be approximately... to approximately Within a certain range, and the thickness D2 of the second light control layer LL2 can be approximately to approximately and about to approximately Within the range.

[0158] Figure 10 A graph showing the reflectance of wavelengths according to Example 1, Example 2, and a comparative example is shown. Example 1 is a comparative example with... Figure 4 The display device shown is configured according to an embodiment of the display device DD. Embodiment 2 is a display device having... Figure 6 The display device shown is configured according to an embodiment of the display device DD. A comparative example is a display device having... Figure 4 The display device DD shown in the embodiment is configured as in Embodiment 1, but has an inorganic layer of a different thickness than that in Embodiment 1.

[0159] Example 1 is a display device including a first light control layer LL1 and an inorganic layer IO, wherein the thickness of the inorganic layer IO is approximately Example 2 is a display device comprising a first light control layer LL1, a second light control layer LL2, and an inorganic layer IO, wherein the thickness of the inorganic layer IO is approximately And the thickness of the second light control layer LL2 is approximately A comparative example is a display device comprising a first light control layer LL1 and an inorganic layer IO, wherein the thickness of the inorganic layer IO is approximately

[0160] Reference Figure 10As can be seen, the reflectance curve trend according to the wavelength of the comparative example differs from the reflectance curve trend according to the wavelengths of Examples 1 and 2. In the comparative example, the curve shape bulges upward in the wavelength range of approximately 480 nm to approximately 680 nm, while in Examples 1 and 2 it bulges downward in the wavelength range of approximately 480 nm to approximately 680 nm. That is, compared to the comparative example, Examples 1 and 2 show a decreasing trend in reflectance in the wavelength range of approximately 480 nm to approximately 680 nm.

[0161] This trend can be caused by differences in the thickness of the inorganic layer IO. The inorganic layer IO can exhibit different trends in light reflectivity depending on its thickness, with increasing and decreasing reflectivity according to wavelength. Therefore, the wavelength range in which reflectivity decreases can vary. Since the thickness of the inorganic layer IO in Examples 1 and 2 is approximately... The thickness of the inorganic layer IO in the comparative example is approximately Therefore, it can be seen that the trends of the curves are different.

[0162] When the thickness of the inorganic layer IO is in the range of about 2.5 nm to about 3.5 nm, it can be seen that the reflectivity is particularly low in the wavelength range of about 500 nm to about 680 nm in the visible light region.

[0163] Furthermore, when comparing Embodiment 1 and Embodiment 2, it can be seen that Embodiment 2 has a greater reduction in reflectivity. This is because when the second light control layer LL2 is also included, the refractive index difference between each of the sequentially stacked wavelength control layer WCL, inorganic layer IO, first light control layer LL1, second light control layer LL2, and color filter layer CFL is reduced, resulting in a decrease in the degree of reflection of external light at the interfaces of each layer.

[0164] The thickness of the inorganic layer IO and the second light control layer LL2 can affect the phase of the transmitted or reflected light. Depending on the phase of the light, constructive interference or destructive interference may occur. Through the destructive interference effect, the external light reflectivity can be reduced. In Example 2, the thickness of the inorganic layer IO is approximately And the thickness of the second light control layer LL2 is approximately Therefore, it can be seen that by adjusting the thickness of the inorganic layer IO and the thickness of the second light control layer LL2, the destructive interference effect can be maximized, and this can reduce the external light reflectivity.

[0165] Table 1 below compares the reflectance of each pixel region and the total reflectance of the display device in Comparative Example and Embodiment 2. "Reflectance per pixel region" refers to the measured reflectance in each pixel region of Comparative Example and Embodiment 2. "Total reflectance" is a value used to predict the total reflectance of the display device based on the reflectance of each pixel region. In Table 1, the first pixel region is the region providing red light, the second pixel region is the region providing green light, and the third pixel region is the region providing blue light.

[0166] [Table 1]

[0167] Classification First pixel area Second pixel area Third pixel area Total reflectance Comparative example 0.33％ 0.43％ 0.38％ 1.35％ Example 2 0.30％ 0.38％ 0.17％ 1.08％

[0168] As shown in Table 1, the reflectance of Example 2 is reduced compared to that of the Comparative Example in all pixel regions. The reduction in reflectance in each pixel region is 0.03% in the first pixel region, 0.05% in the second pixel region, and 0.21% in the third pixel region. As shown in Table 1, the total reflectance prediction result for the Comparative Example is 1.35%, and the total reflectance prediction result for Example 2 is 1.08%, and the total reflectance of Example 2 is reduced by approximately 0.27% compared to the Comparative Example.

[0169] As shown in Table 1, the external light reflectivity of each pixel region of the display device is reduced by the thickness of the inorganic layer, the refractive index matching between the stacked structures on the wavelength control layer of the display device, and the destructive interference effect. It can be understood that by reducing the external light reflectivity corresponding to each pixel region, the total external light reflectivity of the display device can be reduced. Therefore, embodiments of the display device including the light control components according to embodiments of the present invention can improve the external light visibility and reliability of the display device.

[0170] In embodiments of the display device, the inorganic layer and the light control layer included in the light control component have specific ranges of refractive index or thickness, allowing for refractive index matching and destructive interference effects. Therefore, in such embodiments, the external light visibility of the display device can be improved by reducing the external light reflectivity of the display device in some regions where color filters are omitted. In such embodiments, some operations of the process of setting color filters on the display device can be omitted, making the manufacturing of the display device relatively simple and economical.

[0171] In this implementation, the display device has the effect of reducing external light reflectivity and improving reliability.

[0172] Although the invention has been specifically shown and described with reference to embodiments thereof, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A display device, comprising: Display panel; A wavelength control layer is disposed on the display panel; An optical control component is disposed on the wavelength control layer; as well as A cover layer is disposed on the light control component. The light control component includes: An inorganic layer is disposed on the wavelength control layer and has a first refractive index; A first light control layer is disposed on the inorganic layer and has a second refractive index; A second light control layer is disposed on the first light control layer and has a third refractive index; and A color filter layer is disposed on the second light control layer. Wherein, the first refractive index is greater than the second refractive index and less than the refractive index of the wavelength control layer. The third refractive index is greater than the second refractive index and less than the refractive index of the color filter layer.

2. The display device according to claim 1, wherein, Each of the first and third refractive indices is in the range of 1.4 to 1.

5.

3. The display device according to claim 1, wherein, The thickness of the inorganic layer is in the range of 2.5 kÅ to 3.5 kÅ.

4. The display device according to claim 1, wherein, The thickness of the second light control layer is in the range of 0.5kÅ to 1.5kÅ and 2.5kÅ to 3.5kÅ.

5. The display device according to claim 1, wherein, The second light control layer comprises an inorganic film or an organic film.

6. The display device according to claim 5, wherein, The second light control layer includes an optically transparent organic film.

7. The display device according to claim 5, wherein, The second light control layer includes an organic film in which the transmittance in the yellow light wavelength range is less than the transmittance in the blue light wavelength range.

8. The display device according to claim 1, wherein, The second refractive index is 1.3 or less.

9. The display device according to claim 1, wherein, The display panel includes a pixel area and a peripheral area adjacent to the pixel area, and The display panel includes light-emitting elements that generate the first light and are disposed in the pixel area. The wavelength control layer includes: A partition, wherein multiple openings are defined; A first wavelength control unit is disposed in one of the plurality of openings, wherein the first wavelength control unit converts the first light into second light; and A second wavelength control unit is disposed in another of the plurality of openings, wherein the second wavelength control unit converts the first light into a third light. The color filter layer includes: A first color filter section overlaps with the first wavelength control unit, wherein the first color filter section transmits the second light; and The second color filter section overlaps with the second wavelength control unit, wherein the second color filter section transmits the third light.

10. The display device according to claim 9, wherein, A portion of the first color filter section and a portion of the second color filter section overlap with the partition section.

11. The display device according to claim 9, wherein, The wavelength control layer further includes a transmission section, which is disposed in one of the plurality of openings, wherein neither the first wavelength control unit nor the second wavelength control unit is disposed, and wherein the transmission section transmits the first light.

12. The display device according to claim 11, in, The second light control layer overlaps with the transmissive portion. In this case, a portion of the second light control layer that overlaps with the transmissive portion directly contacts the cover layer.

13. The display device according to claim 11, in, The first wavelength control unit and the second wavelength control unit include quantum dots. The transmissive part includes a scatterer.

14. The display device according to claim 11, wherein, The thickness of the transmissive portion is greater than the thickness of the first wavelength control unit and the thickness of the second wavelength control unit.

15. A display device, comprising: The light-emitting element layer outputs the first light; A wavelength control layer is disposed on the light-emitting element layer; as well as An optical control component is disposed on the wavelength control layer. The light control component includes: An inorganic layer is disposed on the wavelength control layer and has a first refractive index; A first light control layer, disposed on the inorganic layer and having a second refractive index; and A color filter layer is disposed on the first light control layer. Wherein, the first refractive index is greater than the second refractive index and less than the refractive index of the wavelength control layer, and The thickness of the inorganic layer is in the range of 2.5 kÅ to 3.5 kÅ.

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