Light source, backlight unit including the light source, and liquid crystal display

Abstract

The present disclosure provides a light source, a backlight unit including the light source, and a liquid crystal display. The light source includes a light-emitting element that emits light and a light conversion layer that converts the light emitted from the light-emitting element into white light and emits the white light. The light conversion layer includes a resin and a quantum dot material mixed with the resin. The red vertex of the color gamut of the white light is in the region where 0.65 < Cx < 0.69 and 0.29 < Cy < 0.3370 in the color coordinates, and the green vertex of the color gamut of the white light is in the region where 0.17 < Cx < 0.31 and 0.61 < Cy < 0.70 in the color coordinates.

Description

[0001] This application is a divisional application of a patent application with an application date of December 7, 2015, application number 201510887861.0, and invention name “Light source, backlight unit including light source, and liquid crystal display”. Technical Field

[0002] The present disclosure relates to a light source, and a backlight unit and a liquid crystal display (LCD) including the same. Background Art

[0003] A liquid crystal display (LCD) generally includes a backlight unit as a light source. The backlight unit includes a light emitting element. As for the light emitting element of the backlight unit, a cold cathode fluorescent lamp (CCFL) is generally used, but a light emitting diode has been widely used recently.

[0004] Light emitting diodes using semiconductors have a long life, can be reduced in size, consume a small amount of energy, and do not include mercury, thus having environmentally friendly characteristics, and thus have attracted attention as next-generation light emitting elements that can replace conventional light emitting elements. Summary of the invention

[0005] Light emitting diodes are used as light emitting elements for backlights, and extend the color area that a liquid crystal display (LCD) can express, but still express a certain range of color areas with reference to sRGB or Adobe RGB. Therefore, a liquid crystal display (LCD) or a light source for such an LCD that can express a sufficient color area with reference to the Digital Cinema Initiatives (DCI) standard is desired.

[0006] Therefore, one embodiment of the present invention provides an LCD and a light source thereof capable of expressing a color area greater than or equal to a specific area of ​​the DCI standard.

[0007] According to one embodiment, a light source includes a light-emitting element that emits light and a light conversion layer that converts the light emitted from the light-emitting element into white light and emits white light, wherein the light conversion layer includes a resin and a quantum dot material mixed with the resin, and the white light includes a green light component having a peak wavelength from about 518 nanometers (nm) to about 550nm and a half-width at half maximum (FWHM) less than about 90nm, and a red light component having a peak wavelength in a region greater than or equal to about 620nm.

[0008] In one embodiment, a light source includes a light-emitting element that emits light and a light conversion layer that converts the light emitted from the light-emitting element into white light and emits the white light, wherein the light conversion layer includes a resin and a quantum dot material mixed with the resin, and the red vertex of the color region of the white light is in a region where 0.65 < Cx < 0.69 and 0.29 < Cy < 0.33 in color coordinates, and the green vertex of the color region of the white light is in a region where 0.17 < Cx < 0.31 and 0.61 < Cy < 0.70 in color coordinates.

[0009] In one embodiment, a backlight unit includes a light-emitting element that emits light and a light conversion layer that converts the light emitted from the light-emitting element into white light and emits the white light, wherein the light conversion layer includes a resin and a quantum dot material mixed with the resin, and the red vertex of the color region of the white light is in a region where 0.65 < Cx < 0.69 and 0.29 < Cy < 0.33 in color coordinates, and the green vertex of the color region of the white light is in a region where 0.17 < Cx < 0.31 and 0.61 < Cy < 0.70 in color coordinates.

[0010] In one embodiment, an LCD includes: a liquid crystal panel including a plurality of color filters; and a backlight unit including a light-emitting element that emits light and a light conversion layer that converts the light emitted from the light-emitting element into white light and supplies the white light to the liquid crystal panel, wherein after the white light passes through the color filters, the red vertex of the color region of the white light is in a region where 0.65 < Cx < 0.69 and 0.29 < Cy < 0.33 in color coordinates, and after the white light passes through the color filters, the green vertex of the color region of the white light is in a region where 0.17 < Cx < 0.31 and 0.61 < Cy < 0.70 in color coordinates. Description of the Drawings

[0011] These and / or other features of the present invention will become apparent and more readily understood from the following detailed description of embodiments of the present invention in conjunction with the accompanying drawings, in which:

[0012] Figure 1 is a cross-sectional view showing an embodiment of a liquid crystal display (LCD) according to the present invention;

[0013] Figures 2 to 4 is a cross-sectional view showing an embodiment of a side-entry type backlight unit according to the present invention;

[0014] Figures 5 to 7 is a cross-sectional view showing an embodiment of a light-emitting element according to the present invention;

[0015] Figure 8 and Fig. 9 is a cross-sectional view showing an embodiment of a direct-lit type backlight unit according to the present invention;

[0016] Fig.10 is a graph showing how a color region supported by a light source that emits white light including a green light component having a full width at half maximum (FWHM) of 39 nanometers (nm) shifts in color coordinates when a peak position of a green light component shifts;

[0017] Fig.11 is a graph showing a color region supported by a white light source in color coordinates in several experimental examples, the color region being shifted by changing the peak position of a green light component having a FWHM of 48 nm;

[0018] Fig.12 is a graph showing how a red apex of a color region supported by a light source emitting white light including a green light component having a FWHM of 39 nm shifts in color coordinates when a peak position of a green light component shifts;

[0019] Fig.13 is a graph showing how a green apex of a color region supported by a light source emitting white light including a green light component having a FWHM of 39 nm shifts in color coordinates when a peak position of a green light component shifts;

[0020] Fig.14 is a graph showing how a blue apex of a color region supported by a light source emitting white light including a green light component having a FWHM of 39 nm shifts in color coordinates when a peak position of a green light component shifts;

[0021] Fig.15 is a graph showing how a red vertex of a color area supported by a light source emitting white light including a green light component having a FWHM of 48 nm shifts in color coordinates when a peak position of a green light component shifts;

[0022] Fig.16 is a graph showing how a green vertex of a color region supported by a light source emitting white light including a green light component having a FWHM of 48 nm shifts in color coordinates when a peak position of a green light component shifts;

[0023] Fig.17 is a graph showing how a blue vertex of a color region supported by a light source emitting white light including a green light component having a FWHM of 48 nm shifts in color coordinates when a peak position of a green light component shifts;

[0024] Fig.18is a graph showing how a red vertex of a color area supported by a light source emitting white light including a green light component having a FWHM of 54 nm shifts in color coordinates when a peak position of a green light component shifts;

[0025] Fig.19 is a graph showing how a green vertex of a color region supported by a light source emitting white light including a green light component having a FWHM of 54 nm shifts in color coordinates when a peak position of a green light component shifts;

[0026] Fig. 20 is a graph showing how a blue vertex of a color region supported by a light source emitting white light including a green light component having a FWHM of 54 nm shifts in color coordinates when a peak position of a green light component shifts;

[0027] Fig.21 is a graph showing a change in brightness of white light emitted by a backlight unit (or light source) according to a peak position of a red light component; and

[0028] Fig. 22 is a graph comparing the spectrum of white light emitted by an embodiment of a backlight unit according to the present invention with the spectrum of the white light after passing through a color filter. DETAILED DESCRIPTION

[0029] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. As those skilled in the art will realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

[0030] For ease of description, spatial relationship terms such as "under", "below", "below", "above", "on", etc. may be used here to describe the relationship of one element or feature to another (some) elements or features as shown in the drawings. It will be understood that the spatial relationship terms are intended to cover different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, in an exemplary embodiment, if the device in the drawings is turned over, the elements described as "under" or "below" other elements or features will be oriented to be "above" the other elements or features. Therefore, the exemplary term "under" can cover both above and below orientations. The device can be oriented differently (rotated 90 degrees or in other orientations), and the spatial relationship descriptors used here are interpreted accordingly.

[0031] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that the terms "comprise" and / or "include", when used in this specification, specify the presence of the features, wholes, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, parts and / or groups thereof.

[0032] As used herein, "about" or "approximately" is inclusive of the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations, or within ±30%, 20%, 10%, 5% of the stated value.

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the invention belongs. It will also be understood that terms, such as those defined in common dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted as an idealized or overly formalized meaning, unless explicitly so defined herein.

[0034] Exemplary embodiments are described herein with reference to cross-sectional views, which are schematic diagrams of idealized embodiments. Thus, deviations from the illustrated shapes caused by, for example, manufacturing techniques and / or tolerances are possible. Therefore, the embodiments described herein should not be interpreted as being limited to the specific shapes of the regions shown herein, but rather include deviations in shapes caused by, for example, manufacturing. For example, a region shown or described as flat may typically have rough and / or nonlinear features. In addition, the sharp angles shown may be rounded. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the precise shapes of the regions and are not intended to limit the scope of the claims.

[0035] In the drawings, the thickness of layers, films, panels, regions, etc., is exaggerated for clarity. Throughout the specification, the same reference numerals always represent the same elements. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly "on" the other element, or there can be intervening elements. Conversely, when an element is referred to as being "directly on" another element, there are no intervening elements.

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0037] Figure 1 is a cross-sectional view showing an embodiment of a liquid crystal display (LCD) according to the present invention.

[0038] An embodiment of an LCD according to the present invention includes: a liquid crystal panel 100; a pair of polarizing films, such as an upper polarizing film 32 and a lower polarizing film 31, respectively disposed above and below the liquid crystal panel 100 (e.g., on opposite surfaces of the liquid crystal panel 100); compensation films on the surface of the liquid crystal panel 100, such as a plurality of compensation films 41 and 42, respectively disposed below and above the liquid crystal panel 100; and a backlight unit 500. The compensation film may be disposed only on one of the upper surface and the lower surface of the liquid crystal panel 100, and the number thereof may be one or more than one.

[0039] The liquid crystal panel 100 includes a lower panel 10 and an upper panel 20, and a liquid crystal layer 30 interposed between the lower panel 10 and the upper panel 20. The lower panel 10 may include a transparent substrate 11, a thin film transistor 13 disposed on the transparent substrate 11, and a pixel electrode 12 connected to the thin film transistor 13. In one embodiment, for example, the thin film transistor 13 may be formed on the transparent substrate 11 by a thin film process, and switches the voltage applied to the pixel electrode 12. The upper panel 20 may include a transparent substrate 21, a black matrix 22 and a color filter 23 disposed on the transparent substrate 21, a planarization layer 24 disposed on or covering the black matrix 22 and the color filter 23, and a common electrode 25 disposed on or covering the planarization layer 24. The pixel electrode 12 is separately disposed or provided at a position corresponding to each color filter 23.

[0040] The backlight unit 500 includes a light emitting element that emits blue light or ultraviolet (UV) light and a light conversion layer that includes a quantum dot material so that the light conversion layer converts the blue light or UV light into white light. The backlight unit 500 may serve as a light source that supplies light to the liquid crystal panel 100.

[0041] The light supplied by the backlight unit 500 is changed into linear polarized light by the lower polarizing film 31 (for example, after passing through the lower polarizing film 31), and the phase of the linear polarized light is selectively changed by the liquid crystal layer 30. The light passing through the liquid crystal layer 30 is filtered into red light, green light and blue light by the color filter 23, and reaches the upper polarizing film 32, but the red light, green light and blue light pass through the upper polarizing film 32 with different light amounts from each other according to the degree of phase change in the liquid crystal layer 30. The amount of light passing through the upper polarizing film 32 can be controlled by adjusting the voltage applied to each pixel electrode 12, so the amount of each red light, green light and blue light passing through the upper polarizing film 32 can be independently controlled. The LCD can display a color image through such a process. Here, the color area displayed by the LCD is determined according to the color purity of the red, green and blue components included in the white light source supplied by the backlight unit 500. Since red light, green light and blue light extracted by filtering white light supplied from the backlight unit 500 through the color filter 23 are used to display images, when the red light, green light and blue light included in the white light have high color purity, the LCD can display various colors and thus represent a large color area in the color coordinates.

[0042] An embodiment of the LCD according to the present invention can display a triangular color gamut (e.g., a triangular color gamut in the CIE 1931 xy chromaticity diagram), wherein, in color coordinates, the red vertex is located in the region where 0.65 < Cx < 0.69 and 0.29 < Cy < 0.33, the green vertex is located in the region where 0.17 < Cx < 0.31 and 0.61 < Cy < 0.70, and the blue vertex is located in the region where 0.12 < Cx < 0.18 and 0.04 < Cy < 0.09. Here, the color coordinates can be the coordinates of the CIE 1931 xy chromaticity diagram. Here, Cx and Cy can be the values of the x-axis and y-axis in the CIE 1931 xy chromaticity diagram, respectively. The white light supplied by the backlight unit 500 includes red, green, and blue components having a color purity capable of representing the triangular color gamut defined above. The triangular color gamut defined above can be defined or drawn as follows: passing the white light supplied by the backlight unit 500 through a red color filter to extract the red component, passing the white light through a green color filter to extract the green component, and passing the white light through a blue color filter to extract the blue component, and then connecting each vertex corresponding to each color component in the color coordinates. When the backlight unit 500 is combined with the liquid crystal panel 100 to manufacture an LCD, the color filter 23 in the liquid crystal panel 100 is used to measure the spectrum of each color. In an embodiment, the red spectrum can be obtained by turning on the red pixels of the LCD but turning off the remaining pixels, the green spectrum can be obtained by turning on the green pixels of the LCD but turning off the remaining pixels, and the blue spectrum can be obtained by turning on the blue pixels of the LCD but turning off the remaining pixels. In an alternative embodiment, the position of each color component in the color coordinates can be calculated by measuring the spectrum of the white light emitted by the backlight unit 500 with a spectroscope and using the peak value and full width at half maximum (FWHM) of the spectrum.

[0043] Here, the blue component is generally emitted by a blue light emitting diode and is determined by the characteristics of the blue light emitting diode and there is no room for variation. Therefore, only the characteristics of the red component and the green component can be considered here.

[0044] An embodiment of the LCD according to the present invention can display a triangular color gamut in the CIE 1931 xy chromaticity diagram. In the color coordinates, the red vertex is located in the region where 0.6611 < Cx < 0.6821 and 0.3092 < Cy < 0.3220, the green vertex is located in the region where 0.1768 < Cx < 0.3061 and 0.6190 < Cy < 0.6615, and the blue vertex is located in the region where 0.1429 < Cx < 0.1525 and 0.0463 < Cy < 0.0885. This triangular color gamut corresponds to a color gamut that represents greater than or equal to about 80% of the Digital Cinema Initiative (DCI) standard. The white light supplied by the backlight unit 500 includes red, green, and blue components having a color purity capable of representing the triangular color gamut defined above. In such an embodiment, the white light emitted by the backlight unit 500 may include a green component having a peak wavelength in the range from about 518 nanometers (nm) to about 550 nm and an FWHM of less than about 90 nm, and a red component having a peak wavelength of greater than or equal to about 620 nm. In an embodiment, when the red component has an FWHM of less than or equal to about 50 nm or a peak wavelength of less than or equal to about 640 nm, the backlight may have improved display brightness.

[0045] An embodiment of the LCD according to the present invention can display a triangular color gamut in the CIE 1931 xy chromaticity diagram. In the color coordinates, the red vertex is located in the region where 0.6747 < Cx < 0.6789 and 0.3097 < Cy < 0.3127, the green vertex is located in the region where 0.2352 < Cx < 0.2611 and 0.6420 < Cy < 0.6578, and the blue vertex is located in the region where 0.1494 < Cx < 0.1512 and 0.0575 < Cy < 0.0657. Such a triangular color gamut is a color gamut that represents greater than or equal to about 90% of the DCI standard. The white light emitted by the backlight unit 500 includes red, green, and blue components having a color purity capable of representing the triangular color gamut defined above. In such an embodiment, the white light emitted by the backlight unit 500 may include a green component having a peak wavelength in the range from about 534 nm to about 540 nm and an FWHM of less than about 50 nm, and a red component having a peak wavelength of greater than or equal to about 620 nm. In an embodiment, when the red component has an FWHM of less than or equal to about 50 nm or a peak wavelength of less than or equal to about 640 nm, the display brightness may be improved.

[0046] Hereinafter, embodiments of the backlight unit 500 of the LCD will be described in more detail.

[0047] Figures 2 to 4is a cross-sectional view showing an embodiment of an edge type backlight unit according to the present invention.

[0048] Reference Figure 2 An embodiment of the backlight unit includes a wedge-shaped light guide 1, a light diffusion plate 2 disposed on the light guide 1, a light emitting element 5 disposed on one side of the light guide 1, and a light conversion layer such as a plurality of conversion layers 3 and 4 interposed between the light guide 1 and the light emitting element 5.

[0049] The light guide 1 is a transparent wedge-shaped quadrilateral plate that gradually becomes thinner from one side to the opposite side and converts linear light into surface light. The diffuser 2 scatters the surface light emitted from the light guide 1 and thereby evenly spreads the surface light. The light emitting element 5 may be a plurality of blue light emitting diodes arranged linearly (e.g., arranged along a single line). The light conversion layers 3 and 4 include quantum dot materials, and thus receive the blue light emitted from the blue light emitting diodes and convert a portion of it into green light and red light to emit white light. For example, the light conversion layers 3 and 4 may include red quantum dot materials and green quantum dot materials, respectively, and each of the red quantum dot materials and the green quantum dot materials includes an InP or InZnP core and a coating including a mixture of ZnSe and ZnS. In one embodiment, the light conversion layers 3 and 4 may be defined separately from the blue light emitting diodes, that is, the light conversion layers 3 and 4 may be formed separately from the blue light emitting diodes without constituting the light emitting element 5 as its elements. The light conversion layer may include two light conversion layers 3 and 4 separated or spaced apart from each other, so that one of the two light conversion layers 3 and 4 can convert blue light into green light and the other of the two light conversion layers 3 and 4 can convert blue light into red light, or each of the two light conversion layers 3 and 4 can include quantum dots that convert blue light into green light and quantum dots that convert blue light into red light. In an optional embodiment, the two light conversion layers 3 and 4 are attached to each other or integrally formed as a single integral and inseparable unit, and a single light conversion layer including quantum dots that convert blue light into green light and quantum dots that convert blue light into red light can be defined. The light conversion layers 3 and 4 may include a film formed by mixing a quantum dot material with a resin, and may include a scatterer such as silica or an auxiliary component to improve optical performance. The quantum dot material may include nanocrystals, etc., including at least one selected from the following: Si-based nanocrystals, compound semiconductor nanocrystals based on II-IV groups, compound semiconductor nanocrystals based on III-V groups, compound semiconductor nanocrystals based on IV-IV groups, and mixtures thereof.Compound semiconductor nanocrystals based on Group II-IV may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZn SeS, HgZnSeTe and HgZnSTe, compound semiconductor nanocrystals based on III-V groups may include GaN, GaP, GaAs, AlN, AlP, AlAs, InN, InP, InZnP, InAs, GaNP, GaNAs, GaPAs, AlNP, AlNAs, AlPAs, InNP, InNAs, InPAs, GaAlNP, GaAlNAs, GaAlPAs, GaInNP, GaInNAs, GaInPAs, InAlNP, InAlNAs and InAlPAs, and compound semiconductor nanocrystals based on IV-IV groups may include SbTe. The quantum dot material may be included in an amount less than or equal to about 5 weight percent (wt%) based on the total weight of the light conversion layers 3 and 4. The resin may include silicone resin, epoxy resin, acrylate, etc. The scatterer may include ZnO, Al. 2 O 3 , ZrO, etc., and may be included in an amount of about 10 wt % based on the total weight of the light conversion layers 3 and 4 .

[0050] Reference Figure 3 , an optional embodiment of the backlight unit includes a wedge-shaped light guide 1, a light diffuser 2 disposed on the light guide 1, a light emitting element 5 disposed on one side of the light guide 1, and a light conversion layer, such as a plurality of light conversion layers 3' and 4', interposed between the light guide 1 and the diffuser 2. In such an embodiment, the light conversion layers 3' and 4' that convert blue light into white light are disposed between the light guide 1 and the diffuser 2, such as Figure 3 The light conversion layers 3 ′ and 4 ′ may be disposed on the diffusion plate 2 . Figure 3 The structure, composition and quantum dot materials of the light conversion layers 3' and 4' shown can be Figure 2 The structures, components and quantum dot materials of the light conversion layers 3 and 4 are shown to be the same, and any repeated detailed description thereof will be omitted.

[0051] Reference Figure 4Another optional embodiment of the backlight unit may include a light guide 1' having a uniform thickness and a transparent quadrilateral plate shape, a light diffusion plate 2 disposed on the light guide 1', and light emitting elements 5' disposed on multiple sides (eg, opposite sides) of the light guide 1'.

[0052] In an embodiment, the light emitting element 5' includes a blue light emitting chip emitting blue light and a light conversion layer covering the blue light emitting chip and including quantum dots converting the blue light into green and red light. Therefore, the light emitting element 5' emits white light.

[0053] In such an embodiment, the light emitting element 5' emitting white light may be arranged on only one side of the light guide 1, such as Figure 2 and Figure 3 In such an embodiment, when a light emitting element 5' emitting white light is used, the light conversion layers 3, 4, 3' and 4' may be omitted.

[0054] The light emitting element 5' emitting white light will be described in more detail later.

[0055] Figures 5 to 7 is a cross-sectional view showing an embodiment of a light emitting element according to the present invention.

[0056] Reference Figure 5, an embodiment of a light emitting element (e.g., a white light emitting element) includes a light emitting diode chip 51 emitting blue light and a light conversion layer 52 covering the light emitting diode chip 51. The light conversion layer 52 can be formed by mixing a quantum dot material 54 (for converting blue light into green light) and a quantum dot material 56 (for converting blue light into red light) with a resin and applying the mixture, and can include a scatterer such as silica or an auxiliary component to improve optical performance. The quantum dot material can include nanocrystals, etc., including at least one selected from the following: Si-based nanocrystals, compound semiconductor nanocrystals based on II-IV groups, compound semiconductor nanocrystals based on III-V groups, compound semiconductor nanocrystals based on IV-IV groups, and mixtures thereof. Compound semiconductor nanocrystals based on Group II-IV may include CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZn SeS, HgZnSeTe and HgZnSTe, compound semiconductor nanocrystals based on III-V groups may include GaN, GaP, GaAs, AlN, AlP, AlAs, InN, InP, InZnP, InAs, GaNP, GaNAs, GaPAs, AlNP, AlNAs, AlPAs, InNP, InNAs, InPAs, GaAlNP, GaAlNAs, GaAlPAs, GaInNP, GaInNAs, GaInPAs, InAlNP, InAlNAs and InAlPAs, and compound semiconductor nanocrystals based on IV-IV groups may include SbTe. The quantum dot material may be included in an amount less than or equal to about 5wt% based on the total weight of the light conversion layer 52. The resin may include silicone resin, epoxy resin, acrylate, etc. The scatterer may include ZnO, Al 2 O 3 , ZrO, etc., and may be included in an amount of about 10 wt % based on the total weight of the light conversion layer 52 .

[0057] Reference Figure 6, an optional embodiment of a light emitting element (e.g., a white light emitting element) includes a light emitting diode chip 51 that emits blue light and a light conversion layer 52 that covers the light emitting diode chip 51. The light conversion layer 52 can be formed by mixing a quantum dot material 54 (for converting blue light into green light) and a quantum dot material 56 (for converting blue light into red light) with a resin and applying the mixture, and can include a scatterer such as silica or an auxiliary component to improve optical performance. The quantum dot material and the scatterer in such an embodiment can be combined with Figure 5 The embodiments shown are substantially the same. Figure 6 In such an embodiment shown, the quantum dot material 54 that converts blue light into green light is applied first, and then the quantum dot material 56 that converts blue light into red light is applied, thereby forming different layers from each other. In such an embodiment, the quantum dot material 56 that converts blue light into red light can be applied first, and then the quantum dot material 54 that converts blue light into green light can be applied.

[0058] Reference Figure 7 In another optional embodiment of the white light emitting element, a quantum dot film 53 that converts blue light into green light and a quantum dot film 57 that converts blue light into red light can be disposed on the light emitting diode chip 51 to form a light conversion layer. The positions of the quantum dot film 53 that converts blue light into green light and the quantum dot film 57 that converts blue light into red light can be interchanged with each other, and can be formed as a single film including a quantum dot material that converts blue light into red light and a quantum dot material that converts blue light into green light. The structure, composition, and quantum dot material of the quantum dot films 53 and 57 in such an embodiment can be the same as those of the embodiment of FIG. Figure 2 The structures, components and quantum dot materials of the light conversion layers 3 and 4 shown are the same.

[0059] In an implementation, the backlight unit may be a direct-type. Figure 8 and Fig. 9 is a cross-sectional view of an embodiment of a direct type backlight unit according to the present invention.

[0060] Reference Figure 8In an embodiment of a direct-type backlight unit, a plurality of blue light emitting elements 5 are arranged at predetermined intervals on a substrate 9 (such as a printed circuit board (PCB) or the like), and light conversion layers 3' and 4' that convert blue light into white light are disposed on the light emitting elements 5. In such an embodiment, a diffuser plate 2 may be disposed on the light conversion layers 3' and 4'. In such an embodiment, the two light conversion layers 3' and 4' may be separated from each other so that one of the two light conversion layers 3' and 4' may convert blue light into green light and the other of the two light conversion layers 3' and 4' may convert blue light into red light, or each of the two light conversion layers 3' and 4' may include quantum dots that convert blue light into green light and quantum dots that convert blue light into red light. In an optional embodiment, the two light conversion layers 3' and 4' are attached to each other to form an integrally formed single integral indivisible unit, and a single light conversion layer including quantum dots that convert blue light into green light and quantum dots that convert blue light into red light may be defined. The light conversion layers 3' and 4' can be formed by mixing quantum dot materials with resins and can include scatterers such as silica or auxiliary components to improve optical properties. The quantum dot materials or scatterers are the same as those in the above embodiments, and any repeated detailed description thereof will be omitted.

[0061] Reference Fig. 9 In an alternative embodiment of the direct-type backlight unit, a plurality of white light emitting elements 5' are arranged at predetermined intervals on a substrate 9 (such as a PCB, etc.), and a diffusion plate 2 is disposed on the light emitting elements 5'. Figures 5 to 7 The above-mentioned embodiments are basically the same as those.

[0062] In an embodiment, the white light of the backlight unit includes red, green and blue components with color purity, and the LCD can display a color area close to, greater than or equal to about 80% of the DCI standard through these red, green and blue components. Such a color area displayed by the LCD will be described in more detail with reference to color coordinates.

[0063] Fig.10 is a graph showing a phenomenon in which a color area supported by a light source emitting white light including a green light component having a FWHM of 39 nm shifts in color coordinates when the peak position of the green light component shifts, Fig.11 is a graph showing a color area supported by a white light source according to several experiments, which color area is shifted in color coordinates by changing the peak position of the green light component having a FWHM of 48nm. Here, "a color area supported by a light source" may refer to a color area displayed by an LCD including the light source. Fig.10 and Fig.11 In FIG. 1 , a two dashed lined triangle represents a DCI standard color area.

[0064] Table 1 shows Fig.10 and Fig.11 The ratio of the area of ​​each color area overlapped with the DCI standard color area to the area of ​​the DCI standard color area is shown as the area ratio of each color area relative to the DCI standard color area (hereinafter, referred to as the "DCI color area ratio"). Table 1 shows data obtained by changing the green quantum dot material in the light emitting element, which uses a light emitting diode emitting blue light with a peak position of 449nm and a FWHM of 18nm and uses a red quantum dot material, which receives the blue light from the light emitting diode and changes the blue light into a red light component with a peak position of 631nm and a FWHM of 48nm.

[0065] (Table 1)

[0066]

[0067] Referring to Table 1, the DCI color area ratio varies according to the peak position and FWHM of the green light component. Fig.10 and Fig.11 , when the peak position of the green light component shifts toward a higher wavelength, the displayed color area shifts in a specific direction.

[0068] Now, the characteristics of white light emitted by an embodiment of the backlight unit according to the present invention will be described in more detail based on experimental data.

[0069] Fig.12 is a graph showing how a red vertex in a color region supported by a light source that emits white light including a green light component shifts in color coordinates when a peak position of a green light component having a FWHM of 39 nm shifts, Fig.13 is a graph showing how a green vertex in a color region supported by a light source that emits white light including a green light component shifts in color coordinates when a peak position of a green light component having a FWHM of 39 nm shifts, Fig.14 is a graph showing how the blue vertex in a color region supported by a light source that emits white light including a green light component shifts in color coordinates when the peak position of the green light component having a FWHM of 39 nm shifts. Figure 12 to Figure 14 In FIG. 1 , the double-dashed line indicates the DCI standard color area.

[0070] Reference Fig.12 , when the peak position of the green light component shifts toward a higher wavelength, the red vertex of the color region shifts in the upper left direction. That is, the x value of the red vertex decreases and its y value increases.

[0071] Reference Fig.13, when the peak position of the green light component shifts toward a high wavelength, the green vertex of the color region shifts in the right direction. That is, the x value of the green vertex increases and its y value increases and then decreases.

[0072] Reference Fig.14 , when the peak position of the green light component shifts toward a higher wavelength, the blue vertex of the color region shifts in the lower right direction. That is, the x value of the blue vertex increases and its y value decreases.

[0073] Table 2 shows that by including Figure 12 to Figure 14 Table 2 is data obtained by changing the green quantum dot material in the light emitting element, which includes a light emitting diode emitting blue light with a peak position of about 449 nm and a FWHM of about 18 nm and a red quantum dot material receiving the blue light and changing the blue light into a red light component with a peak position of about 631 nm and a FWHM of about 48 nm to about 49 nm. The green light component of the light emitting element has a FWHM in the range from about 39 nm to about 40 nm. Figure 12 to Figure 14 The colored areas shown are labeled #1, #2, #4, #6, #8, #10, #12, #14, #16, #18 and #19 in Table 2 below.

[0074] (Table 2)

[0075]

[0076]

[0077] Referring to Table 2, when a green light component having a FWHM in the range from about 39 nm to about 40 nm has a peak position in the range from about 518 nm to about 550 nm, the DCI color area ratio of light from the light emitting device becomes greater than or equal to about 80%, and when a green light component has a peak position in the range from about 534 nm to about 540 nm, the DCI color area ratio of light from the light emitting device becomes greater than or equal to about 90%.

[0078] Table 3 provides the color coordinates of the red, green, and blue vertices in the 19 color region data of Table 2.

[0079] (Table 3)

[0080]

[0081] Fig.15is a graph showing how the red vertex of a color area supported by a light source emitting white light including a green light component having a FWHM of 48 nm shifts in color coordinates when the peak position of the green light component shifts, Fig.16 is a graph showing how the green vertex of a color area supported by a light source emitting white light including a green light component having a FWHM of 48 nm shifts in color coordinates when the peak position of the green light component shifts, Fig.17 is a graph showing how the blue vertex of a color region supported by a light source emitting white light including a green light component having a FWHM of 48 nm shifts in color coordinates when the peak position of the green light component shifts. Figures 15 to 17 In FIG. 1 , the double-dashed line indicates the DCI standard color area.

[0082] Reference Fig.15 , when the peak position of the green light component shifts toward a higher wavelength, the red vertex of the color region shifts in the upper left direction. That is, the x value of the red vertex decreases and its y value increases.

[0083] Reference Fig.16 , when the peak position of the green light component shifts toward a high wavelength, the green vertex of the color region shifts in the right direction. That is, the x value of the green vertex increases and its y value increases and then decreases.

[0084] Reference Fig.17 , when the peak position of the green light component shifts toward a higher wavelength, the blue vertex of the color region shifts in the lower right direction. That is, the x value of the blue vertex increases and its y value decreases.

[0085] Table 4 shows that by including Figures 15 to 17 19 DCI color zone ratio data obtained by changing the green quantum dot material in the light emitting element, which includes a light emitting diode emitting blue light with a peak position of about 449nm and a FWHM of 18nm and a red quantum dot material receiving the blue light and changing the blue light into a red light component with a peak position of about 631nm and a FWHM of about 49nm. The green light component of the light emitting element has a FWHM in the range of 48nm to 49nm. Figures 15 to 17 The colored areas shown are labeled #1, #2, #4, #6, #8, #10, #12, #14, #16, #18 and #19 in Table 2 below.

[0086] (Table 4)

[0087]

[0088]

[0089] Referring to Table 4, when the green light component having a FWHM of 48nm to 49nm has a peak position within the range of 518nm to 550nm, the DCI color area ratio of the light from the light emitting element becomes greater than or equal to about 80%, and when the peak position is within the range of 536nm to 538nm, the DCI color area ratio of the light from the light emitting element becomes greater than or equal to 90%.

[0090] Table 5 provides the color coordinates of the red, green, and blue vertices in the 19 color region data of Table 4.

[0091] (Table 5)

[0092]

[0093] Fig.18 shows how the red vertex of a color region supported by a light source emitting white light including a green light component having a FWHM of 54 nm shifts in color coordinates when the peak position of the green light component shifts, Fig.19 shows how the green vertex of a color region supported by a light source emitting white light including a green component having a FWHM of 54 nm shifts in color coordinates when the peak position of the green component shifts, Fig. 20 It shows how the blue vertex of a color region supported by a light source emitting white light including a green component having a FWHM of 54 nm shifts in color coordinates when the peak position of the green component shifts.

[0094] Reference Fig.18 , when the peak position of the green light component shifts toward a higher wavelength, the red vertex of the color region shifts in the upper left direction. That is, the x value of the red vertex decreases and its y value increases.

[0095] Reference Fig.19 , when the peak position of the green light component shifts toward a high wavelength, the green vertex of the color region shifts in the right direction. That is, the x value of the green vertex increases and its y value increases and then decreases.

[0096] Reference Fig. 20 , when the peak position of the green light component shifts toward a higher wavelength, the blue vertex of the color region shifts in the lower right direction. That is, the x value of the blue vertex increases and its y value decreases.

[0097] Table 6 shows that by including Figures 18 to 20Nineteen DCI color gamut ratio data obtained by shifting the peak position of the green light component for each of the color gamuts shown. Table 6 shows the data obtained by changing the green quantum dot material in the light-emitting element, which includes a light-emitting diode that emits blue light having a peak position of 449 nm and an FWHM of 18 nm, and a red quantum dot material that receives the blue light and changes the blue light into a red light component having a peak position of 631 nm and an FWHM of 49 nm. The green light component has an FWHM in the range from 52 nm to 54 nm. Figures 18 to 20 The color gamuts shown are labeled #1, #2, #4, #6, #8, #10, #12, #14, #16, #18, and #19 in Table 6 below.

[0098] (Table 6)

[0099]

[0100]

[0101] Referring to Table 6, when the green light component having an FWHM in the range from 52 nm to 54 nm has a peak position in the range from 518 nm to 548 nm, the DCI color gamut ratio of the light from the light-emitting element becomes greater than or equal to 80%.

[0102] Table 7 shows the color coordinates of the red, green, and blue vertices in the 19 color gamut data of Table 6.

[0103] (Table 7)

[0104]

[0105]

[0106] Referring to Tables 3, 5, and 7, when the triangular color gamut is displayed to have a red vertex in the region of 0.6611 < Cx < 0.6821 and 0.3092 < Cy < 0.3220, a green vertex in the region of 0.1768 < Cx < 0.3061 and 0.6190 < Cy < 0.6615, and a blue vertex in the region of 0.1429 < Cx < 0.1525 and 0.0463 < Cy < 0.0885 in the color coordinates, the color gamut can display approximately 80% or more of the DCI standard. Therefore, an embodiment of the backlight unit according to the present invention can be configured to emit white light including red, green, and blue components having color purity capable of displaying such a triangular color gamut.

[0107] In an embodiment, when the triangular color region is displayed as having a red vertex in the region of 0.6747 < Cx < 0.6789 and 0.3097 < Cy < 0.3127 in color coordinates, a green vertex in the region of 0.2352 < Cx < 0.2611 and 0.6420 < Cy < 0.6578, and a blue vertex in the region of 0.1494 < Cx < 0.1512 and 0.0575 < Cy < 0.0657, the color region can display approximately 90% or more of the DCI standard. Accordingly, an embodiment of the backlight unit according to the present invention can be configured to emit white light including red, green, and blue components having a color purity capable of displaying such a triangular color region.

[0108] In an embodiment, based on the above data, when the triangular color region is displayed as having a red vertex in the region of 0.65 < Cx < 0.69 and 0.29 < Cy < 0.33 in color coordinates, a green vertex in the region of 0.17 < Cx < 0.31 and 0.61 < Cy < 0.70, and a blue vertex in the region of 0.12 < Cx < 0.18 and 0.05 < Cy < 0.09, the color region can display approximately 75% or more of the DCI standard. Accordingly, an embodiment of the backlight unit according to the present invention can be configured to emit white light including red, green, and blue components having a color purity capable of displaying such a triangular color region.

[0109] Table 8 shows the DCI color region ratios supported by a white light source obtained by changing the FWHM of the green light component according to various experimental embodiments. The white light source includes a green light component having a peak position of 538 nm. Table 8 shows data obtained by changing the green quantum dot material in a light emitting element that uses a light emitting diode emitting blue light having a peak position of 449 nm and an FWHM of 18 nm and a red quantum dot material that receives the blue light and changes the blue light into a red light component having a peak position of 635 nm and an FWHM of 42 nm.

[0110] (Table 8)

[0111]

[0112] Referring to Table 8, when the green light component has an FWHM of less than 90 nm, the DCI color region ratio of the light from the white light source becomes 80% or more.

[0113] Table 9 shows the DCI color area ratio supported by each white light source obtained by changing the peak position of the red light component with a FWHM of 49 nm according to various experimental embodiments. Table 9 shows data obtained by changing the red quantum dot material in the light emitting element, which uses a light emitting diode emitting blue light with a peak position of 449 nm and a FWHM of 18 nm and a green quantum dot material that receives the blue light and shifts the blue light to a green light component with a peak position of 550 nm and a FWHM of 38 nm.

[0114] (Table 9)

[0115]

[0116]

[0117] Referring to Table 9, when the red light component has a peak position greater than or equal to 620 nm, the DCI color area ratio of the light of the white light source becomes close to 80%.

[0118] Fig.21 is a graph showing a change in brightness of white light emitted by a backlight unit (or light source) according to a peak position of a red light component.

[0119] Reference Fig.21 , when the peak position of the red light component shifts toward the long wavelength, the brightness of the white light emitted by the backlight unit (light source) becomes lower. When the red light component has a peak position greater than 645nm, the brightness is reduced to less than or equal to 90%. Therefore, an embodiment of the backlight unit (or light source) according to the present invention may include a red light component having a peak position in the range from 620nm to 645nm.

[0120] An embodiment of the backlight unit (or light source) according to the present invention emits white light including red light, green light and blue light with high color purity. Therefore, a small spectrum change of the white light can occur before and after passing through the color filter.

[0121] Fig. 22 is a graph comparing the spectrum of white light emitted from an embodiment of a backlight unit (or light source) according to the present invention with the spectrum of white light after passing through a color filter. Table 10 shows Fig. 22The peak positions and FWHM of the green light component and the red light component in the graph of the white light are shown in FIG. The white light spectrum is obtained by using a spectroscope, and the spectrum after the white light passes through the color filter is obtained by combining the spectrum of the green component of the white light passing through the green filter, the spectrum of the red component of the white light passing through the red filter, and the spectrum of the blue component of the white light passing through the blue filter. Here, the color filter is a color filter used for a general television or monitor. When the spectrum is measured by combining a backlight unit with a liquid crystal panel to construct an LCD, the color filter in the liquid crystal panel can be used to obtain a red spectrum by turning on the red pixels of the LCD and turning off the rest of its pixels, a green spectrum by turning on the green pixels of the LCD and turning off the rest of its pixels, and a blue spectrum by turning on the blue pixels of the LCD and turning off the rest of its pixels.

[0122] (Table 10)

[0123] Before the filter After the color filter Green peak(nm) 537 536 Green FWHM(nm) 41 40 Red peak(nm) 629 628 Red FWHM(nm) 52 50

[0124] Reference Fig. 22 As shown in Table 10, the green and red components of the white light emitted from the embodiment of the backlight unit (or light source) show a peak position variation of 1 nm, so there is almost no peak position variation before and after passing through the color filter, and each variation of the FWHM of 1 nm and 2 nm, that is, less than or equal to 2 nm. In such an embodiment, the backlight unit (or light source) changes blue light into green and red light by using quantum dot materials and thus produces white light.

[0125] The light conversion layer in the embodiment of the backlight unit (or light source) may include a scatterer and a quantum dot material. The scatterer may include ZnO, Al 2 O 3 , ZrO, etc., and can improve brightness. Table 11 shows brightness and white color coordinate changes according to the type of the scatterer. The scatterer may be included in an amount less than or equal to 10 wt % based on the entire weight of the light conversion layer.

[0126] (Table 11)

[0127]

[0128] Referring to Table 11, when ZnO is used as a scatterer, the maximum brightness improvement can be obtained.

[0129] Table 12 shows the brightness and white color coordinate changes when ZnO is used as a scatterer.

[0130] (Table 12)

[0131]

[0132] Referring to Table 12, the brightness and white color coordinates of white light emitted from the backlight unit may be adjusted by controlling the amount of the diffuser.

[0133] Table 13 shows the color temperature variation of white light according to the white color coordinates. The white color coordinates can be obtained by adjusting the ratio among the scatterer and the red and green quantum dot materials (eg, a ratio within the range provided in Table 13).

[0134] (Table 13)

[0135] Cx Cy Color temperature change (K) 0.303 0.319 7179 0.303 0.339 6931 0.313 0.329 6488 0.323 0.339 5933 0.323 0.319 5998 0.26 0.28 13689 0.26 0.3 11626 0.27 0.29 11152 0.28 0.3 9468 0.28 0.28 10618

[0136] Referring to Table 13, the color temperature of white light may be in the range of about 5900 Kelvin (K) to about 14000K.

[0137] While the invention has been described in connection with what are presently considered to be enabling exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but on the contrary is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the claims.

[0138] This application claims priority to and all benefits arising from Korean Patent Application No. 10-2014-0192265, filed on Dec. 29, 2014, the contents of which are incorporated herein by reference in their entirety.

Claims

1. A display device, comprising: A backlight unit, comprising: A light-emitting element that emits blue light, and A layer comprising a resin, a quantum dot material, and a scatterer mixed with the resin, the quantum dot material being capable of converting light emitted from the light-emitting element into green light or red light to emit white light from the backlight unit, and A color filter, and Wherein, the scatterer is present in an amount less than or equal to 10 wt% based on the total weight of the layer, and Wherein, the display device emits light after passing through the color filter, and the display device displays a red vertex of a color region in a region where 0.65 < Cx < 0.69 and 0.29 < Cy < 0.33 in color coordinates, a green vertex of a color region in a region where 0.17 < Cx < 0.31 and 0.61 < Cy < 0.70 in the color coordinates, and a blue vertex of a color region in a region where 0.12 < Cx < 0.18 and 0.04 < Cy < 0.09 in the color coordinates, where Cx and Cy are the values of the x-axis and y-axis in the CIE 1931 xy chromaticity diagram, respectively.

2. The display device according to claim 1, wherein: The light after passing through the color filter includes a green light component having a peak wavelength of 518 nm to 550 nm.

3. The display device according to claim 2, wherein: The green light component has a full width at half maximum of less than 90 nm.

4. The display device according to claim 2, wherein: The green light component has a peak wavelength of 534 nm to 540 nm.

5. The display device according to claim 2, wherein: The green light component has a full width at half maximum of less than 39 nm.

6. The display device according to claim 1, wherein: The light after passing through the color filter includes a red light component having a peak wavelength of 620 nm to 640 nm.

7. The display device according to claim 6, wherein: The red light component has a full width at half maximum of less than 50 nm.

8. The display device according to claim 1, wherein: The amount of the quantum dot material in the layer is less than or equal to 5 wt% based on the total weight of the layer.

9. The display device according to claim 1, wherein: The scatterer includes at least one of ZnO, Al2O3, and ZrO.

10. The display device according to claim 1, wherein: The display device displays a color region equal to or greater than 90% of the Digital Cinema Initiatives standard.

11. The display device according to claim 1, wherein the quantum dot material includes: An InP or InZnP core; And A coating comprising ZnSe, ZnS, or a combination thereof.

12. The display device according to claim 1, the color filter includes a green color filter, a red color filter, a blue color filter, or a combination thereof.

13. The display device according to claim 2, wherein: The full width at half maximum difference of the green light component of the light is less than or equal to 2 nm before and after the light passes through the color filter.

14. The display device according to claim 6, wherein: The full width at half maximum difference of the red light component of the light is less than or equal to 2 nm before and after the light passes through the color filter.

15. The display device according to claim 1, wherein: The red vertex of the color region of the light is in a region where 0.6747 < Cx < 0.6789 and 0.3097 < Cy < 0.3127 in color coordinates.

16. The display device according to claim 1, wherein: The green vertex of the color region of the light is in a region where 0.2352 < Cx < 0.2611 and 0.6420 < Cy < 0.6578 in color coordinates.

17. The display device according to claim 1, wherein: The blue vertex of the color region of the light is in a region where 0.1494 < Cx < 0.1512 and 0.0575 < Cy < 0.0657 in color coordinates.

18. The display device according to claim 1, wherein: The red vertex of the colored region of the light is located in the region where 0.6611 < Cx < 0.6821 and 0.3092 < Cy < 0.3220 in the color coordinates.

19. The display device according to claim 1, wherein: The green vertex of the colored region of the light is located in the region where 0.1768 < Cx < 0.3061 and 0.6190 < Cy < 0.6615 in the color coordinates.

20. The display device according to claim 1, wherein: The blue vertex of the colored region of the light is located in the region where 0.1429 < Cx < 0.1525 and 0.0463 < Cy < 0.0885 in the color coordinates.

21. A display device, comprising: A backlight unit, comprising: A light-emitting element that emits blue light, and A layer containing a resin, a quantum dot material, and a scatterer mixed with the resin, the quantum dot material being capable of converting the light emitted from the light-emitting element into green light or red light to emit white light from the backlight unit, and A color filter, Wherein the display device emits the light after passing through the color filter, Wherein the light after passing through the color filter includes a green light component having a peak wavelength of 518 nm to 550 nm and a full width at half maximum of less than 90 nm, and Wherein the display device displays a green vertex of a colored region located in the region where 0.1768 < Cx < 0.3061 and 0.6190 < Cy < 0.6615 in the color coordinates, where Cx and Cy are the values of the x-axis and y-axis in the CIE 1931 xy chromaticity diagram, respectively.

22. The display device according to claim 21, wherein: The display device displays a colored region equal to or greater than 90% of the Digital Cinema Initiatives standard.

23. The display device according to claim 21, wherein: The display device displays a green vertex of a colored region located in the region where 0.2352 < Cx < 0.2611 and 0.6420 < Cy < 0.6578 in the color coordinates.

24. The display device according to claim 21, wherein: The green light component has a peak wavelength of 534 nm to 540 nm.

25. The display device according to claim 21, wherein: The green light component has a full width at half maximum of less than 39 nm.

26. The display device according to claim 21, wherein The full width at half maximum difference of the green light component of the light before and after passing through the color filter is less than or equal to 2 nm.

27. The display device according to claim 21, wherein: The scatterer is present in an amount of less than or equal to 10 wt% based on the total weight of the layer.

28. A display device, comprising: A backlight unit, comprising: A light-emitting element that emits blue light, and A layer containing a resin, a quantum dot material, and a scatterer mixed with the resin, the quantum dot material being capable of converting the light emitted from the light-emitting element into green light or red light to emit white light from the backlight unit, and A color filter, Wherein the display device emits the light after passing through the color filter, Wherein the light after passing through the color filter includes a red light component having a peak wavelength of 620 nm to 640 nm and a full width at half maximum of less than 50 nm, and Wherein the display device displays a red vertex of a colored region located in the region where 0.6611 < Cx < 0.6821 and 0.3092 < Cy < 0.3220 in the color coordinates, where Cx and Cy are the values of the x-axis and y-axis in the CIE 1931 xy chromaticity diagram, respectively.

29. The display device according to claim 28, wherein: The display device displays a colored region equal to or greater than 90% of the Digital Cinema Initiatives standard.

30. The display device according to claim 28, wherein: The display device displays the red vertices of the color regions in the region where 0.6747 < Cx < 0.6789 and 0.3097 < Cy < 0.3127 in the color coordinates.

31. The display device according to claim 28, wherein: The scatterer is present in an amount less than or equal to 10 wt% based on the total weight of the layer.

32. The display device according to claim 28, wherein: The red light component of the light has a full width at half maximum difference of less than or equal to 2 nm before and after the light passes through the color filter.

Images