KR102161206B1 - Display device - Google Patents

Abstract

A display device is disclosed. The display device of the present invention comprises: a display panel; An optical sheet disposed behind the display panel and including a first fluorescent layer; An optical assembly disposed behind the optical sheet and providing light to the first fluorescent layer may be included. The optical assembly includes: a substrate facing the first fluorescent layer and spaced apart from the first fluorescent layer; A light source mounted on the front surface of the substrate and providing light to the first fluorescent layer; A lens mounted on the front surface of the substrate and covering the light source; In addition, a second fluorescent layer positioned between the lens and the substrate may be included.

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device.

As the information society develops, the demand for display devices is increasing in various forms, and in response to this, recently, LCD (Liquid Crystal Display Device), PDP (Plasma Display Panel), ELD (Electro luminescent Display), VFD (Vacuum Fluorescent Display) Display) and other various display devices have been studied and used.

Among them, a liquid crystal panel of an LCD includes a TFT substrate and a color filter substrate facing each other with a liquid crystal layer and a liquid crystal layer therebetween, and an image can be displayed using light provided from the backlight unit.

Recently, as interest in image quality of display devices has increased, color expression power or color reproduction power close to true color is receiving important attention, and many studies have been conducted on image quality improvement for realizing natural colors.

It is an object of the present invention to solve the above and other problems. Another object may be to provide a display device capable of improving image quality.

Another object may be to provide a display device capable of improving color gamut.

Another object may be to provide a display device capable of improving a color difference of light provided by a backlight unit.

According to an aspect of the present invention to achieve the above or other objects, a display panel; An optical sheet disposed behind the display panel and including a first fluorescent layer; An optical assembly disposed behind the optical sheet and providing light to the first fluorescent layer, the optical assembly comprising: a substrate facing the first fluorescent layer and spaced apart from the first fluorescent layer; A light source mounted on the front surface of the substrate and providing light to the first fluorescent layer; A lens mounted on the front surface of the substrate and covering the light source; And it provides a display device comprising a second fluorescent layer positioned between the lens and the substrate.

According to another aspect of the invention, the lens, the bottom surface facing the substrate; A top surface facing the bottom surface and concave with respect to the bottom surface; In addition, a side surface extending from the bottom surface to the upper surface may be included, and the second fluorescent layer may be adjacent to a side surface of the lens.

According to another aspect of the invention, the lens, the bottom surface facing the substrate; An upper surface facing the bottom surface; In addition, a side surface extending from the bottom surface to the top surface is included, the top surface and the side surface are convex with respect to the bottom surface, and the second fluorescent layer may be adjacent to the light source.

According to another aspect of the present invention, the lens includes a bottom surface facing the substrate, and a ratio of an area of the second phosphor layer to the bottom surface area of the lens may be 17 to 25 percent (%).

According to another aspect of the present invention, the light source may provide blue light, and the first phosphor layer may include yellow and red phosphors.

According to another aspect of the present invention, the second fluorescent layer may include yellow and red phosphors.

According to another aspect of the present invention, the second fluorescent layer has the same optical properties as the first fluorescent layer, and the optical sheet may provide white light to the display panel.

According to another aspect of the present invention, the second fluorescent layer may be attached to the substrate.

According to another aspect of the present invention, the optical assembly further includes a lens hole reflective sheet positioned between the lens and the substrate, and the second fluorescent layer is positioned between the lens hole reflective sheet and the lens. I can.

According to another aspect of the present invention, the second fluorescent layer may be attached to the lens.

According to another aspect of the present invention, the second fluorescent layer may have a ring shape surrounding the light source.

According to another aspect of the present invention, the second fluorescent layer includes a first additional fluorescent layer having a ring shape surrounding the light source, and a second additional fluorescent layer having a ring shape surrounding the first additional fluorescent layer. Can include.

According to another aspect of the present invention, the second phosphor layer may include a plurality of dots containing a phosphor.

According to another aspect of the present invention, the plurality of dots may be larger as they are adjacent to the light source.

According to another aspect of the present invention, the plurality of dots may be smaller as they are adjacent to the light source.

The effect of the display device according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, it is possible to improve the image quality of the display device.

In addition, according to at least one of the embodiments of the present invention, it is possible to improve the color gamut.

In addition, according to at least one of the embodiments of the present invention, a color difference of light provided from the backlight unit may be improved.

Further scope of applicability of the present invention will become apparent from the detailed description below. However, since various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, specific embodiments such as the detailed description and preferred embodiments of the present invention should be understood as being given by way of example only.

1 to 10 are diagrams showing a display device related to the present invention.
11A and 11B are diagrams illustrating an optical assembly of a display device according to an exemplary embodiment of the present invention.
12 is a diagram showing a graph of a color temperature distribution of an optical sheet according to an embodiment of the present invention.
13 to 16 are views showing various arrangements of a second phosphor layer in a display device according to an exemplary embodiment of the present invention.
17 to 19 are diagrams illustrating various shapes of a second phosphor layer in a display device according to an exemplary embodiment of the present invention.
20 is a diagram illustrating a graph of a ratio of a second fluorescent layer in a display device according to an embodiment of the present invention.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but identical or similar elements are denoted by the same reference numerals regardless of reference numerals, and redundant descriptions thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used interchangeably in consideration of only the ease of preparation of the specification, and do not have meanings or roles that are distinguished from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, when it is determined that a detailed description of related known technologies may obscure the subject matter of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are for easy understanding of the embodiments disclosed in the present specification, and the technical idea disclosed in the present specification is not limited by the accompanying drawings, and all modifications included in the spirit and scope of the present invention , It should be understood to include equivalents or substitutes.

1 to 10 are diagrams showing a display device related to the present invention.

Hereinafter, a liquid crystal panel (LCD) will be described as an example of the display panel, but the display panel applicable to the present invention is not limited to the liquid crystal panel.

In addition, hereinafter, the display device includes a first long side (LS1), a second long side (LS2) facing the first long side (LS1), a first long side (LS1), and a second long side (LS2). A first short side (SS1) adjacent to) and a second short side (SS2) opposite to the first short side SS1 may be included.

Here, the first short side area SS1 is referred to as a first side area, and the second short side area SS2 is referred to as a second side area opposite to the first side area. The first long side area LS1 is referred to as a third side area adjacent to the first side area and the second side area and positioned between the first side area and the second side area, and the second long side area ( LS2) may be referred to as a fourth side area adjacent to the first side area and the second side area, located between the first side area and the second side area, and facing the third side area. .

In addition, for convenience of explanation, the first and second long sides LS1 and LS2 are illustrated and described as being longer than the first and second short sides SS1 and SS2. However, the first and second long sides LS1 and LS2 It may be possible that the length of LS2) is approximately the same as the lengths of the first and second short sides SS1 and SS2.

In addition, hereinafter, the first direction (DR1) is a direction parallel to the long side (Long Side, LS1, LS2) of the display panel 100, the second direction (Second Direction, DR2) of the display panel 100 It may be in a direction parallel to the short side (SS1, SS2).

The third direction (DR3) may be a direction perpendicular to the first direction (DR1) and/or the second direction (DR2).

The first direction DR1 and the second direction DR2 may be collectively referred to as a horizontal direction. In addition, the third direction DR3 may be referred to as a vertical direction.

From another point of view, the side on which the display device displays an image may be referred to as a forward direction or a front side or front surface. When the display device displays an image, the side in which the image cannot be observed may be referred to as a rear side or rear surface. When looking at the display from the front or the front, the side of the first long side LS1 may be referred to as an upper side or an upper surface. Similarly, the second long side LS2 side may be referred to as a lower side or a lower surface. Similarly, the first short side SS1 side may be referred to as a right side or a right surface, and the second short side SS2 side may be referred to as a left side or a left surface. .

In addition, the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 may be referred to as edges of the display device. Also, a point where the first long side LS1, the second long side LS2, the first short side SS1, and the second short side SS2 meet each other may be referred to as a corner. For example, the point where the first long side LS1 and the first short side SS1 meet is the first corner C1, and the point where the first long side LS1 and the second short side SS2 meet is the second corner C2. ), the second short side (SS2) and the second long side (LS2) meet at the third corner (C3), and the second long side (LS2) and the first short side (SS1) meet at the fourth corner (C4) Can be.

Here, a direction from the first short side SS1 to the second short side SS1 or a direction from the second short side SS2 to the first short side SS1 may be referred to as a left-right direction LR. A direction from the first long side LS1 to the second long side LS2 or a direction from the second long side LS2 to the first long side LS1 may be referred to as a vertical direction UD.

1 and 2, the back cover 150 may be coupled to the display panel 110. In order for the back cover 150 to be coupled to the display panel 110, the back cover 150 and/or other structures adjacent thereto may include a protrusion, a sliding portion, and a coupling portion.

Referring to FIG. 3, the front cover 105 may cover at least some of the front and side surfaces of the display panel 110. The front cover 105 may be divided into a front cover positioned on the front side of the display panel 110 and a side cover positioned on the side side of the display panel 110. Front cover and side cover can be configured separately. Either of the front cover and the side cover may be omitted.

The display panel 110 is provided on the front surface of the display device 100 and may display an image. The display panel 110 may display an image by outputting red, green, or blue (RGB) per pixel according to a timing of a plurality of pixels. The display panel 110 may be divided into an active area in which an image is displayed and a de-active area in which an image is not displayed. The display panel 110 may include a front substrate and a rear substrate facing each other with a liquid crystal layer therebetween.

The front substrate may include a plurality of pixels including red (R), green (G), and blue (B) subpixels. The front substrate may output light corresponding to a color of red, green, or blue according to a control signal.

The rear substrate may include switching elements. The rear substrate can switch the pixel electrode. For example, the pixel electrode may change the molecular arrangement of the liquid crystal layer according to a control signal applied from the outside. The liquid crystal layer may include liquid crystal molecules. The arrangement of the liquid crystal molecules may be changed according to the voltage difference generated between the pixel electrode and the common electrode. The liquid crystal layer may transmit or block light provided from the backlight unit 120 to the front substrate.

The backlight unit 120 may be located behind the display panel 110. The backlight unit 120 may include light sources. The backlight unit 120 may be coupled to the frame 130 in front of the frame 130.

The backlight unit 120 may be driven by a full driving method or a partial driving method such as local dimming or impulsive. The backlight unit 120 may include an optical sheet 125 and an optical assembly 123.

The optical sheet 125 may allow light from a light source to be evenly transmitted to the display panel 110. The optical sheet 125 may be composed of layers. For example, the optical sheet 125 may include a prism sheet, a diffusion sheet, or the like.

The optical sheet 125 may be provided with a coupling portion 125d. The coupling portion 125d may be coupled to the front cover 105, the frame 130 and/or the back cover 150. Alternatively, the coupling portion 125d may be formed on the front cover 105, the frame 130, and/or the back cover 150 or may be fastened to a structure coupled to each other.

The optical assembly 123 may be located behind the optical sheet 125. The optical assembly 123 may provide light to the optical sheet 125. The light assembly 123 may include a light source that generates light.

The frame 130 may serve to support components of the display device 100. For example, a configuration such as the backlight unit 120 may be coupled to the frame 130. The frame 130 may be made of a metal material such as an aluminum alloy.

The back cover 150 may be located at the rear or rear of the display device 100. The back cover 150 may be coupled to the frame 130 and/or the front cover 105. For example, the back cover 150 may be an injection product made of a resin material.

Referring to FIG. 4A, the backlight unit 120 may be positioned in front of the frame 130. The backlight unit 120 may include an optical assembly 123 and an optical sheet 125. The optical assembly 123 may be positioned between the optical sheet 125 and the frame 130. The optical assembly 123 may include a diffusion plate 129.

The optical sheet 125 or/and the diffusion plate 129 may be coupled to the frame 130 at the edge of the frame 130. The optical sheet 125 or/and the diffusion plate 129 may be directly seated on the edge of the frame 130. That is, the optical sheet 125 or/and the diffusion plate 129 may be supported by the frame 130. The edge surface of the reflective sheet 125 may be covered by the first guide panel 117. For example, the optical sheet 125 or/and the diffusion plate 129 may be positioned between the edge of the frame 130 and the flange 117a of the first guide panel 117.

The display panel 110 may be positioned in front of the optical sheet 125. The edge of the display panel 110 may be supported by the first guide panel 117. An edge region of the front surface of the display panel 110 may be covered by the front cover 105. For example, this means that a part of the display panel 110 may be positioned between the first guide panel 117 and the front cover 105.

Referring to FIG. 4B, the optical sheet 125 or/and the diffusion plate 129 may be coupled to the second guide panel 113. That is, the second guide panel 113 may be coupled to the frame 130, and the optical sheet 125 or/and the diffusion plate 129 may be coupled to the second guide panel 113. The second guide panel 113 may be made of a material different from that of the frame 130. The frame 130 may have a shape surrounding the first and second guide panels 117 and 113. The first or second guide panels 117 and 113 may be referred to as a holder or a support member.

Referring to FIG. 4C, the front cover 105 may not cover the front surface of the display panel 110. That is, one end of the front cover 105 may be located on the side of the display panel 110.

Referring to FIG. 5, the backlight unit 120 may include an optical assembly 123 and an optical sheet 125 positioned on the front side of the optical assembly 123.

The optical assembly 123 may include a substrate 122, at least one optical module 124, a reflective sheet 126, and a diffusion plate 129. The optical assembly 123 may not include some of these components.

The substrate 122 may be configured in the form of a plurality of straps extending in a first direction and spaced apart by a predetermined distance in a second direction orthogonal to the first direction.

At least one optical module 124 may be mounted on the substrate 122. An electrode pattern for connecting the adapter and the optical module 124 to the substrate 122 may be formed. For example, a carbon nanotube electrode pattern for connecting the optical module 124 and the adapter may be formed on the substrate 122.

The substrate 122 may be made of at least one of polyethylene terephthalate (PET), glass, polycarbonate (PC), and silicon. The substrate 122 may be a printed circuit board (PCB) on which at least one optical module 124 is mounted.

An optical module 124 may be disposed on the substrate 122 with a predetermined distance in the first direction. The diameter of the optical module 124 may be larger than the width of the substrate 122. That is, it means that the length of the substrate 122 in the second direction may be greater.

The optical module 124 may be a light emitting diode (LED) chip or a light emitting diode package including at least one light emitting diode chip.

The optical module 124 may be composed of a colored LED or a white LED that emits at least one color among colors such as red, blue, and green. The colored LED may include at least one of a red LED, a blue LED, and a green LED.

A reflective sheet 126 may be positioned on the front side of the substrate 122. The reflective sheet 126 may be positioned on an area of the substrate 122 other than the area in which the optical module 124 is formed. The reflective sheet 126 may include a plurality of through holes 235.

The reflective sheet 126 may reflect light emitted from the optical module 124 to the front side. In addition, the reflective sheet 126 may reflect light reflected from the diffusion plate 129 again.

The reflective sheet 126 may include at least one of a reflective material, a metal and a metal oxide. For example, the reflective sheet 126 may include a metal and/or a metal oxide having a high reflectivity such as at least one of aluminum (Al), silver (Ag), gold (Au), and titanium dioxide (TiO2). I can.

The supporter 200 may be coupled to the reflective sheet 126. The supporter 200 may have a shape protruding from the reflective sheet 126 toward the front. For example, the supporter 200 may be positioned between the reflective sheet 126 and the diffusion plate 129. Alternatively, the supporter 200 may be positioned between the reflective sheet 126 and the optical sheet 125. By the supporter 200, a distance between the reflective sheet 126 and the diffusion plate 129 may be maintained, or a distance between the reflective sheet 126 and the optical sheet 125 may be maintained.

Resin may be deposited on the optical module 124 and/or the reflective sheet 126. The resin may serve to diffuse light emitted from the optical module 124.

The diffusion plate 129 may diffuse light emitted from the optical module 124. A plurality of optical modules 124 may be disposed as a point light source. Light provided to the front from the plurality of optical modules 124 may have different luminance depending on the distance to the optical module 124. The diffusion plate 129 may evenly distribute the luminance according to the arrangement of the plurality of optical modules 124.

The optical sheet 125 may be positioned in front of the diffusion plate 129. The rear surface of the optical sheet 125 may be in close contact with the diffusion plate 129, and the front surface of the optical sheet 125 may be in close contact with the rear surface of the display panel 110 (see FIG. 1 ).

The optical sheet 125 may include at least one or more sheets. Specifically, the optical sheet 125 may include one or more prism sheets and/or one or more diffusion sheets. A plurality of sheets included in the optical sheet 125 may be adhered and/or adhered to each other.

The optical sheet 125 may be composed of a plurality of sheets having different functions. For example, the optical sheet 125 may include first to third optical sheets 125a to 125c. For example, the first optical sheet 125a may be a diffusion sheet, and the second and third optical sheets 125b and 125c may be prism sheets. The number and/or position of the diffusion sheet and the prism sheet may be changed.

The diffusion sheet may prevent the light emitted from the diffusion plate 129 from being partially concentrated, thereby making the distribution of light more uniform. The prism sheet may provide light to the display panel 110 by condensing light emitted from the diffusion sheet.

The coupling portion 125d may be formed on at least one of the sides or edges of the optical sheet 125. The coupling portion 125d may be formed on at least one of the first to third optical sheets 125a to 125c.

The coupling portion 125d may be formed on the long side of the optical sheet 125. The coupling portion 125d formed on the first long side and the coupling portion 125d formed on the second long side may be asymmetric. For example, it means that the positions and/or the number of the coupling portions 125d on the first long side and the coupling portions 125d on the second long side may be different from each other.

Referring to FIG. 6, an optical assembly 123 may be observed. Referring to FIG. 6A, the optical module 124 may be disposed on the front surface of the substrate 122. The plurality of optical modules 124 may be disposed to be spaced apart. The plurality of optical modules 124 may provide light (or rays) to the front.

The reflective sheet 126 may be disposed on the front surface of the substrate 122. The optical module 124 may be disposed between the reflective sheets 126.

The diffusion plate 129 may be positioned in front of the optical module 124. The diffusion plate 129 may be positioned in front of the reflective sheet 126. The diffusion plate 129 may be disposed to be spaced apart from the optical module 124. The diffusion plate 129 may be disposed spaced apart from the reflective sheet 126.

The air layer AL may be formed between the diffusion plate 129 and the optical module 124. The air layer AL may be formed between the diffusion plate 129 and the reflective sheet 126. The air layer AL may contain a stable gas. For example, the air layer AL may include a gas that is the same as or similar to the composition of air. For example, the air layer AL may contain nitrogen or/and oxygen.

The optical sheet 125 may be disposed on the front surface of the diffusion plate 129. The optical sheet 125 may include first to third optical sheets 125a, 125b, and 125c. The first optical sheet 125a may be located on the front surface of the diffusion plate 129. The second optical sheet 125b may be positioned on the front surface of the first optical sheet 125a. The third optical sheet 125c may be positioned on the front surface of the third optical sheet 125b.

Referring to FIG. 6B, the optical sheet 125 may include a first optical sheet 125a and a second optical sheet 125b. The first optical sheet 125a may be a diffusion sheet. The second optical sheet 125b may be a prism sheet.

Referring to FIG. 6C, the optical sheet 125 may be positioned in front of the optical module 124. The optical sheet 125 may be positioned in front of the reflective sheet 126. The optical sheet 125 may include a first optical sheet 125a and a second optical sheet 125b. The first optical sheet 125a may be a diffusion sheet. The second optical sheet 125b may be a prism sheet.

The air layer AL may be formed between the optical sheet 125 and the reflective sheet 126. The air layer AL may be formed between the optical sheet 125 and the optical module 124.

Referring to FIG. 7, the reflective sheet 126 may be coupled to the frame 130. For example, the reflective sheet 126 may be coupled to the seating portion 132 formed on the inside of the frame 130. The reflective sheet 126 may have a three-dimensional shape corresponding to the shape of the seating portion 132.

The reflective sheet 126 may include a horizontal coupling portion HH and/or a vertical coupling portion VH. The horizontal coupling portion HH and/or the vertical coupling portion VH may have a shape of an opening formed along a side of the reflective sheet 126.

The horizontal coupling portion HH may be an opening formed along two opposite sides of the reflective sheet 126. The horizontal coupling portion HH may be, for example, an opening formed along the long side of the reflective sheet 126.

The vertical coupling portion VH may be an opening formed along two opposite sides of the reflective sheet 126. The vertical coupling portion VH may be, for example, an opening formed along a short side of the reflective sheet 126.

The frame 130 may include a horizontal protrusion 130H and a vertical protrusion 130V. The horizontal protrusion 130H or the vertical protrusion 130V may be formed along two opposite sides of the frame 130. For example, the horizontal protrusion 130H may be formed along the long side of the frame 130. For example, the vertical protrusion 130V may be formed along a short side of the frame 130.

The horizontal protrusion 130H or the vertical protrusion 130V may protrude toward the front. The horizontal protrusion 130H or the vertical protrusion 130V may be combined with the reflective sheet 126. For example, the horizontal protrusion 130H may be coupled to the horizontal coupling portion HH of the reflective sheet 126. For example, the vertical protrusion 130V may be coupled to the vertical coupling portion VH of the reflective sheet 126.

The guide panel GP may have an elongated rod shape. The guide panel GP may be disposed on the front surface of the reflective sheet 126. The guide panel GP may be disposed along the edge of the reflective sheet 126. The guide panel GP may be formed of a combination of elongated rods.

The guide panel GP may include plastic. The guide panel GP may be formed by injection. The guide panel GP may include metal. The guide panel GP may be formed by pressing.

The substrate 122 may be positioned between the frame 130 and the reflective sheet 126. The optical module 124 may be disposed on the front surface of the substrate 122. The optical module 124 may be located in the lens hole 235 formed in the reflective sheet 126.

The plurality of substrates 122 may be disposed in a horizontal direction or/and a vertical direction. The substrate 122 may be electrically connected to the signal line 121. The substrate 122 may receive power or/and an electric signal from the signal line 121.

The lens hole 125 formed in the reflective sheet 126 may be formed corresponding to the light source 203 disposed on the substrate 122. The light source 203 may be located in the lens hole 125. A part of the light source 203 and the substrate 122 may be exposed to the front through the lens hole 125. The lens 124b may be positioned in front of the light source 203. The lens 124b may be coupled to a part of the substrate 122 exposed in front through the lens hole 125.

The reflective sheet 126 can form a supporter hole 205. The supporter 200 may be coupled to the supporter hole 205. The supporter 200 may support a diffusion plate 129 (see FIG. 5) and/or an optical sheet 125 (see FIG. 5) positioned in front of the reflective sheet 126. By the supporter 200, the reflective sheet 126 may be spaced apart from the diffusion plate 129 (see FIG. 5) or/and the optical sheet 125 (see FIG. 5).

The reflective sheet 126 may form a plurality of fixing pin holes 206. The fixing pin 202 may be coupled to the fixing pin hole 206. The fixing pin 202 may be coupled to the frame hole 204 formed in the frame 130. The fixing pin 202 may fasten the reflective sheet 126 to the frame 130.

8 and 9, a light source 203 may be installed on the front surface of the substrate 122. The light source 203 may include a colored LED. For example, the light source 203 may include a blue LED.

The light source 203 may be of a Chip On Board (COB) type. When the COB type light source 203 is applied to the substrate 122, the power efficiency of the optical module 124 may be improved. The COB type light source 203 may be implemented lighter and thinner than the conventional one. The plurality of light sources 203 may be disposed on the substrate 122 in one direction. For example, both light sources 203 adjacent to each other may be disposed on the substrate 122 at the X1 position and the X2 position.

The reflective sheet 126 may be disposed on the entire surface of the substrate 122. The reflective sheet 126 may not overlap with the light source 203. The reflective sheet 126 may be formed by depositing and/or coating a metal or metal oxide. Ink including a metallic material may be printed on the reflective sheet 126. A vapor deposition layer using a vacuum deposition method such as a thermal evaporation method, an evaporation method, or a sputtering method may be formed on the reflective sheet 126. A coating layer and/or a printing layer using a printing method, a gravure coating method, or a silk screen method may be formed on the reflective sheet 126.

The lens 124b may be installed on the front surface of the substrate 122. The lens 124b may be located in front of the light source 203. The light source 203 may be positioned between the lens 124b and the substrate 122. The lens 124b may be a first type lens 124b1. The first type lens 124b1 may be referred to as a refractive lens 124b1. The lens 124b may include the foot 124lg of the lens. The foot 124lg of the lens may be formed on the bottom surface of the lens 124b. The bottom surface of the lens 124b may face the substrate 122. The lens foot 124lg may support the lens 124b on the substrate 122.

The optical sheet 125 may be positioned in front of the lens 124b. The optical sheet 125 may be spaced apart from the lens 124b. The optical sheet 125 may include a first optical sheet 125a and a second optical sheet 125b. The first optical sheet 125a can diffuse light. The second optical sheet 125b may be a prism sheet. The optical sheet 125 may be positioned behind the display panel 110 (see FIG. 3 ). The optical sheet 125 may provide white light to the display panel 110 (refer to FIG. 3 ).

The optical sheet 125 may include a fluorescent material. The fluorescent material may change the wavelength of incident light. Referring to FIG. 8, the optical sheet 125 may include a fluorescent sheet 125f. The fluorescent sheet 125f may be referred to as a fluorescent layer 125f. The fluorescent sheet 125f may be located on the rear surface of the first optical sheet 125a. The fluorescent sheet 125f may include a fluorescent material. Referring to FIG. 9, the first optical sheet 125a may be a fluorescent sheet 125f. The first optical sheet 125a may include a fluorescent material. The fluorescent sheet 125f may be referred to as a first fluorescent layer 125f.

Light provided by the light source 203 may form a spectrum according to a wavelength. For example, light provided by the light source 203 may form a spectrum having a large specific gravity of a wavelength corresponding to blue color. Light provided by the light source 203 may be referred to as a first light L1. For example, the first light L1 may be referred to as a blue light L1.

The first light L1 may travel from the light source 203 to the lens 124b. The first light L1 may enter the lens 124b. The first light L1 incident on the lens 124b may be refracted from the surface of the lens 124b. The first light L1 traveling from the lens 124b may be discharged to the outside of the lens 124b. The first light L1 emitted to the outside of the lens 124b may be refracted from the surface of the lens 124b. The first light L1 may be diffused from the light source 203 through the lens 124b. The diffused first light L1 may reach the fluorescent sheet 125f.

At least a portion of the first light L1 incident on the fluorescent sheet 125f may be converted into the second light L2 in the fluorescent sheet 125f. The second light L2 may be different from the spectrum of the first light L1. For example, the second light L2 may form a spectrum having a large specific gravity of a wavelength corresponding to red or/and yellow.

A part of the second light L2 may travel toward the front of the fluorescent sheet 125f. Light provided by the fluorescent sheet 125f to the front may include a first light L1 and a second light L2. Another part of the second light L2 may travel toward the rear of the fluorescent sheet 125f. In FIGS. 8 and 9, the second light L2 positioned behind the fluorescent sheet 125f may be indicated by a dotted line. The second light L2 positioned on the air layer AL may be indicated by a dotted line.

The second light L2 may be reflected by the reflective sheet 126. The second light L2 may travel toward the fluorescent sheet 125f. The second light L2 directed to the fluorescent sheet 125f may act with the fluorescent sheet 125f and travel toward the rear of the fluorescent sheet 125f. In this way, the frequency of the second light L2 acting with the fluorescent sheet 125f between the neighboring light sources 203 may be greater than the frequency with which the first light L1 acts with the fluorescent sheet 125f. have. A position where the first light L1 acts with the fluorescent sheet 125f may be adjacent to the light source 203.

The light provided by the fluorescent sheet 125f in the front at a position adjacent to the light source 203 is compared to the light provided by the fluorescent sheet 125f in the front at a position between the neighboring light sources 203, from the light source 203 It can be similar to the nature of the light it provides. For example, the specific gravity of the wavelength corresponding to blue color in the spectrum of light provided by the fluorescent sheet 125f in front of the light source 203 at a location adjacent to the light source 203 is, the fluorescent sheet 125f May be larger than the specific gravity of the wavelength corresponding to blue in the spectrum of light provided to the front.

The specific gravity of a wavelength corresponding to red or yellow in the spectrum of light provided by the fluorescent sheet 125f in front of the adjacent light sources 203 is, in a position adjacent to the light source 203, the fluorescent sheet 125f is in front. It may be larger than the specific gravity of the wavelength corresponding to red or yellow in the spectrum of light provided to. That is, light provided in front of the optical sheet 125 may be seen in different colors depending on the area.

Referring to FIG. 10, the color temperature of light provided by the fluorescent sheet 125f forward at a position adjacent to the light source 203 is, light provided by the fluorescent sheet 125f forward at a position between the neighboring light sources 203. May be higher than the color temperature of.

The color temperature of light provided to the front by the fluorescent sheet 125f at the position X1 may be referred to as a first color temperature f1[°K]. The color temperature of light provided to the front by the fluorescent sheet 125f at the position X2 may be referred to as the second color temperature f2[°K]. The color temperature of light provided by the fluorescent sheet 125f forward at Xe, which is a position between the neighboring light sources 203, may be referred to as the boundary color temperature (fe[°K]).

The difference between the first color temperature f1[˚K] and the boundary color temperature fe[˚K] may be referred to as the first color temperature difference fd1[˚K]. The difference between the second color temperature f2[˚K] and the boundary color temperature fe[˚K] may be referred to as the second color temperature difference fd2[˚K]. The first color temperature difference fd1[°K] may be the same as the second color temperature difference fd2[°K]. The color temperature difference fd may mean at least one of the first color temperature difference fd1[°K] and the second color temperature difference fd2[°K].

As the color temperature difference fd increases, the color distribution of light provided by the fluorescent sheet 125f to the front may be uneven. The smaller the color temperature difference fd is, the more uniform the color tone distribution of light provided by the fluorescent sheet 125f to the front may be.

A method of improving the uniformity of light provided by the optical sheet 125 to the front may be considered. The uniformity of light may mean a degree of uniformity of color distribution for an area.

Referring to FIG. 11A, the additional fluorescent layer AFL may be positioned between the lens 124b and the substrate 122. The additional fluorescent layer AFL may include a fluorescent material. The additional fluorescent layer AFL may be spaced apart from the light source 203. The additional fluorescent layer AFL may be referred to as a second fluorescent layer AFL.

The additional fluorescent layer AFL may be attached to the lens 124b. The lens 124b may be a first type lens 124b1. The additional fluorescent layer AFL may be located on the bottom surface of the lens 124b. The additional fluorescent layer AFL may be positioned between the foot 124lg of the first type lens 124b1 and the light source 203.

The additional fluorescent layer AFL may receive light traveling from the lens 124b. For example, the additional fluorescent layer AFL may receive the first light L1.

The additional fluorescent layer AFL may receive the first light L1 and convert it into the second light L2. The second light L2 formed in the additional fluorescent layer AFL may travel toward the optical sheet 125 through the lens 124b. The second light L2 formed in the additional fluorescent layer AFL may travel toward a position adjacent to the light source 203. When the second light L2 directed toward the optical sheet 125 is directed toward a position adjacent to the light source 203, the color temperature of light provided by the optical sheet 125 toward the front at a position adjacent to the light source 203 may be lowered. . The second fluorescent layer AFL may improve uniformity of light provided by the fluorescent sheet 125f to the front.

Light provided by the fluorescent sheet 125f to the front by the second fluorescent layer AFL may be generally similar to the property of the second light L2. In this case, the characteristics of the first fluorescent layer AFL may be adjusted so that the light provided in front of the fluorescent sheet 125f becomes white light. For example, the characteristics (light conversion characteristics) of the first fluorescent layer AFL are adjusted so that the ratio of the first fluorescent layer AFL receiving the first light L1 and providing the second light L2 is lowered. Can be. For example, the thickness of the first fluorescent layer AFL may be reduced. For example, the density of the phosphor contained in the first phosphor layer AFL may decrease.

When the lens 124b is the first type lens 124b1, the additional fluorescent layer AFL is disposed adjacent to the center of the lens 124b, and the additional fluorescent layer AFL is disposed adjacent to the outer circumference of the lens 124b. In comparison, it may be advantageous in terms of color distribution. When the lens 124b is the first type lens 124b1, the additional fluorescent layer AFL is arranged adjacent to the center of the lens 124b by increasing the specific gravity of the second light L2 at the center of the lens 124b. The specific gravity of the first light L1 concentrated adjacent to the center of the lens 124b may be relatively reduced.

Referring to FIG. 11B, the lens 124b may be a second type lens 124b2. The second type lens 124b2 may be referred to as a reflective lens 124b2. The structure of the second type lens 124b2 may be different from that of the first type lens 124b1. The tendency of the second type lens 124b2 to provide light to the side may be greater than that of the first type lens 124b1 to provide light to the side.

The additional fluorescent layer AFL may be located on the bottom surface of the second type lens 124b2. The additional fluorescent layer AFL may be positioned outside the foot 124lg of the second type lens 124b2. The foot 124lg of the second type lens 124b2 may be positioned between the light source 203 and the additional fluorescent layer AFL. The second light L2 formed in the additional fluorescent layer AFL may travel forward toward a position adjacent to the light source 203.

When the lens 124b is the second type lens 124b2, the additional fluorescent layer AFL is disposed adjacent to the outer periphery of the lens 124b, and the additional fluorescent layer AFL is disposed adjacent to the center of the lens 124b. In comparison, it may be advantageous in terms of uniformity of color distribution. When the lens 124b is the second type lens 124b2, the placement of the additional fluorescent layer AFL adjacent to the outer circumference of the lens 124b increases the specific gravity of the second light L2 near the outer circumference of the lens 124b. Accordingly, the specific gravity of the first light L1 concentrated adjacent to the outer circumference of the lens 124b can be relatively reduced.

Referring to FIG. 12, uniformity of a color temperature distribution of light provided by the fluorescent sheet 125f to the front may be improved by the additional fluorescent layer AFL shown in FIG. 11A or 11B.

The color temperature of light provided to the front by the fluorescent sheet 125f at X1 may be referred to as a first improved color temperature af1[°K]. The color temperature of light provided to the front by the fluorescent sheet 125f in X2 may be referred to as a second improved color temperature (af2[°K]). The color temperature of light provided to the front by the fluorescent sheet 125f at Xe, which is a position between the neighboring light sources 203, may be referred to as a boundary improvement color temperature (afe[°K]).

The difference between the first enhancement color temperature af1[˚K] and the boundary enhancement color temperature afe[˚K] may be referred to as the first enhancement color temperature difference afd1[˚K]. The difference between the second enhancement color temperature af2[˚K] and the boundary enhancement color temperature afe[˚K] may be referred to as the second enhancement color temperature difference afd2[˚K]. The first improvement color temperature difference afd1[°K] may be the same as the second improvement color temperature difference afd2[°K]. The enhancement color temperature difference afd may mean at least one of a first enhancement color temperature difference afd1 [°K] and a second enhancement color temperature difference afd2[°K].

The improved color temperature difference afd may be smaller than the color temperature difference fd (refer to FIG. 10 ). By the additional fluorescent layer AFL, the color tone distribution of light provided by the fluorescent sheet 125f to the front can be made more uniform.

Referring to FIG. 13, the additional fluorescent layer AFL may be formed on the substrate 122. The additional fluorescent layer AFL formed on the substrate 122 may be referred to as a substrate additional fluorescent layer 122fl. The substrate-added fluorescent layer 122fl may be positioned between the substrate 122 and the lens 124b. The substrate-added fluorescent layer 122fl may be printed on the entire surface of the substrate 122.

Referring to FIG. 13A, the lens 124b may be a first type lens 124b1. The substrate-added fluorescent layer 122fl may be positioned between the foot 124lg of the lens 124b1 and the light source 203.

Referring to FIG. 13B, the lens 124b may be a second type lens 124b2. The substrate-added fluorescent layer 122fl may be positioned outside the foot 124lg of the lens 124b2.

Referring to FIG. 13C, the entire surface of the substrate 122 may be observed. A light source 203 may be installed on the front surface of the substrate 122. In a state in which the lens 124b is not installed on the front surface of the substrate 122, the additional phosphor layer 122fl formed on the substrate 122 may be seen.

The substrate-added fluorescent layer 122fl may have a ring shape. The thickness of the substrate-added fluorescent layer 122fl in the radial direction may be constant along the azimuth direction. The substrate-added fluorescent layer 122fl may surround the light source 203. The substrate-added fluorescent layer 122fl may have a shape in which a circle having a first radius R1 is removed from an inside of a circle having a second radius R2.

The second radius R2 may be larger than the first radius R1. The first radius R1 when the first type lens 124b1 is installed on the substrate 122 is smaller than the first radius R1 when the second type lens 124b2 is installed on the substrate 122. I can.

14A and 14B, the lens hole reflection sheet 126d may be positioned in the lens hole 235 of the reflection sheet 126. The lens hole reflective sheet 126d may be positioned between the lens 124b and the substrate 122. The lens hole reflection sheet 126d may reflect light from the lens 126b toward the substrate 122.

The additional fluorescent layer AFL may be positioned between the lens 124b and the lens hole reflection sheet 126d. The additional fluorescent layer AFL may be attached to the lens hole reflective sheet 126d. For example, the additional fluorescent layer AFL may be printed on the lens hole reflective sheet 126d. The additional fluorescent layer AFL attached to the lens hole reflective sheet 126d may be referred to as a reflective sheet additional fluorescent layer 126fl.

Referring to FIG. 14A(a), the lens 124b may be a first type lens 124b1. The first type lens 124b1 may include a foot 124lg protruding toward the substrate 122. The reflective sheet-added fluorescent layer 126fl may be positioned between the light source 203 and the foot 124lg of the lens.

Referring to FIG. 14A(b), the lens hole reflective sheet 126d may form a hole in the center. The hole formed in the center of the lens hole reflection sheet 126d may be referred to as a lens hole reflection sheet center hole 126ho. The lens hole reflection sheet center hole 126ho may correspond to the light source 203. The lens hole reflection sheet center hole 126ho may accommodate the light source 203.

The lens hole reflection sheet 126d may form a lens foot receiving hole 126hl formed between the lens hole reflection sheet center hole 126ho and the outer circumference. The lens foot receiving hole 126hl may correspond to the foot 124lg of the lens. The lens foot receiving hole 126hl may accommodate the foot 124lg of the lens.

The reflective sheet-added fluorescent layer 126fl may be formed on one surface of the lens hole reflective sheet 126d. The reflective sheet-added fluorescent layer 126fl may be formed between the lens hole reflective sheet center hole 126ho and the lens foot receiving hole 126hl. The reflective sheet-added fluorescent layer 126fl may be formed between the first radius R1 and the second radius R2 at the center of the lens hole reflection sheet 126d. The outer periphery of the lens hole reflection sheet 126d may be located apart from the outer radius Ro from the center of the lens hole reflection sheet 126d. The second radius R2 may be larger than the first radius R1. The outer radius Ro may be larger than the second radius R2.

Referring to (a) of FIG. 14B, the lens 124b may be a second type lens 124b2. The second type lens 124b2 may include a foot 124lg protruding toward the substrate 122. The reflective sheet-added fluorescent layer 126fl may have a shape surrounding the light source 203 and the foot 124lg of the lens or may be positioned outside. The feet 124lg of the lens may be positioned between the light source 203 and the reflective sheet-added fluorescent layer 126fl.

Referring to (b) of FIG. 14B, the reflective sheet-added fluorescent layer 126fl may be formed on one surface of the lens hole reflective sheet 126d. The reflective sheet-added fluorescent layer 126fl may be positioned between the lens foot receiving hole 126hl and the outer periphery of the lens hole reflecting sheet 126d. The reflective sheet-added fluorescent layer 126fl may be formed between the first radius R1 and the second radius R2 at the center of the lens hole reflection sheet 126d. A circle formed by the first radius R1 at the center of the lens hole reflection sheet 126d may cover the lens foot receiving hole 126hl.

15 and 16, the additional fluorescent layer AFL may be attached to the lens 124b. The additional fluorescent layer AFL may be positioned between the lens 124b and the substrate 122 (see FIGS. 11A and 11B). The bottom surface 124bbs of the lens 124b may face the substrate 122 (see FIGS. 11A and 11B). The additional fluorescent layer AFL attached to the bottom surface 124bbs of the lens may be referred to as a lens additional fluorescent layer 124fl.

The lens 124b may include a bottom surface 124bbs, an upper surface 124bts, and a side surface 124bls. The top surface 124bts of the lens may face the bottom surface 124bbs of the lens. The side surface 124bls of the lens may extend from the bottom surface 124bbs of the lens and be connected to the upper surface 124bts of the lens.

The foot 124lg of the lens may have a shape protruding from the bottom surface 124bbs of the lens. The lens 124b may include a concave surface 124bcs. The concave surface 124bcs may have a shape recessed from the center of the bottom surface 124bbs of the lens toward the inside of the lens 124b.

Referring to FIG. 15A, the lens 124b may be a first type lens 124b1. The bottom surface 124bbs of the first type lens 124b1 may be larger than the top surface 124bts of the first type lens 124b1.

The side surface 124bls of the first type lens 124b1 may be inclined with respect to the bottom surface 124bbs or the upper surface 124bts. The side surface 124bls of the first type lens 124b1 may have a shape inclined toward the inside of the first type lens 124b1 from the bottom surface 124bbs to the top surface 124bts.

The side surface 124bls of the first type lens 124b1 may have a convex shape from the inside to the outside of the lens 124b1.

The lens-added fluorescent layer 124fl may be positioned between the foot 124lg of the lens and the concave surface 124bcs.

Referring to FIG. 15B, the bottom surface 124bbs of the first type lens 124b1 may be observed in front. The lens-added fluorescent layer 124fl may have a ring shape.

Referring to FIG. 16A, the lens 124b may be a second type lens 124b2. The upper surface 124bts of the second type lens 124b2 may be larger than the bottom surface 124bbs of the second type lens 124b2. The upper surface 124bts of the second type lens 124b2 may have a shape recessed toward the center of the lens 124bts toward the center of the upper surface 124bts. The lens-added fluorescent layer 124fl may be positioned between the foot 124lg of the lens and the outer periphery of the lens 124b2.

Referring to FIG. 16B, the bottom surface 124bbs of the second type lens 124b2 may be observed in front. A side surface 124bls of a shape surrounding the bottom surface 124bbs of the second type lens 124b2 may be observed.

17 to 19, various patterns or shapes of the additional fluorescent layer AFL may be displayed. The additional fluorescent layer AFL may have a shape or pattern surrounding the light source 203 (see FIGS. 11A or 11B). The additional fluorescent layer AFL may be located farther from the center COC than the inner radius Ri. The inner radius Ri may correspond to the light source 203 (see FIG. 11A or 11B). The additional fluorescent layer AFL may be located within the outer radius Ro. The outer radius Ro may correspond to the lens hole 235 (see FIG. 7 ). The circle corresponding to the outer radius Ro can be referred to as the outer periphery (PER).

Referring to FIG. 17A, the additional fluorescent layer AFL may form a ring shape formed between the first radius R1 to the second radius R2. The second radius R2 may be larger than the first radius R1.

Referring to FIG. 17B, the additional fluorescent layer AFL may include a first additional fluorescent layer AFL1 and a second additional fluorescent layer AFL2. The second additional fluorescent layer AFL2 may have a shape surrounding the first additional fluorescent layer AFL1. The first additional fluorescent layer AFL1 may form a ring shape formed between the first radius R1 to the second radius R2. The second additional fluorescent layer AFL2 may form a ring shape formed between the third radius R3 to the fourth radius R4. The inner radius (Ri), the first radius (R1), the second radius (R2), the third radius (R3), the fourth radius (R4), and the outer radius (Ro) can be arranged in ascending order in terms of length. have.

Referring to FIG. 18A, the additional fluorescent layer AFL may have a dot-shaped pattern. The additional fluorescent layer AFL may be formed between the first radius R1 to the second radius R2. The size of the dot shape of the additional fluorescent layer AFL may be constant. The additional fluorescent layer AFL having a dot-shaped pattern may be adjacent to the center portion. The dot-shaped pattern may mean a shape in which a plurality of dots are arranged. The plurality of dots may include a phosphor.

Referring to FIG. 18B, the dot shape of the additional fluorescent layer AFL may increase as it approaches the center COC. Referring to FIG. 18C, the dot shape of the additional fluorescent layer AFL may increase as it approaches the outer periphery PER. The additional fluorescent layer AFL adjacent to the center COC may be suitable for the first type lens 124b1 (refer to FIG. 15 ).

Referring to FIG. 19A, the additional fluorescent layer AFL may have a dot-shaped pattern. The dot size of the additional fluorescent layer AFL may be constant. The additional fluorescent layer AFL having a dot-shaped pattern may be adjacent to the outer periphery PER.

Referring to FIG. 19B, the dot shape of the additional fluorescent layer AFL may increase as it approaches the center COC. Referring to FIG. 19C, the dot shape of the additional fluorescent layer AFL may increase as it approaches the outer periphery PER. The additional fluorescent layer AFL adjacent to the outer periphery PER may be suitable for the second type lens 124b2 (refer to FIG. 16 ).

Referring to FIG. 20, the difference between the area ratio of the additional fluorescent layer (AFL) (hereinafter referred to as'fluorescent area ratio') and the improved color temperature to the bottom surface (124bbs, see FIGS. The relationship of absolute values can be displayed as a graph. The absolute value of the improvement color temperature difference may mean a value obtained by taking an absolute value of the improvement color temperature difference afd.

The improved color temperature difference (afd, see FIG. 12) may have a positive sign or a negative sign. The closer the improvement color temperature difference is to zero, the more uniform the color tone distribution of light provided by the fluorescent sheet 125f (refer to FIGS. 11A and 11B) to the front may become more uniform.

If the fluorescent area ratio is too small, the effect of the additional fluorescent layer (AFL) is insignificant, and thus the difference in color temperature improvement may have a positive value and may have a large absolute value. If the fluorescence area ratio is too small, light provided by the optical sheet 125 (see FIGS. 11A and B) to the front may not be uniform in terms of color. For example, if the fluorescence area ratio is too small, light provided in front of the optical sheet 125 (see FIGS. 11A and B) at a position adjacent to the light source 203 (see FIGS. 11A and B) may appear blue compared to the surroundings. .

If the fluorescent area ratio is too large, the effect of the additional fluorescent layer AFL may be enlarged. For example, when the fluorescence area ratio is too large, the fluorescent sheet 125f may receive an excessive amount of second light (L2, see FIGS. 11A and 11B) in an area adjacent to the lens 124b (see FIGS. 11A and 11B). . In this case, the improved color temperature difference (afd, see FIG. 12) may have a negative value and a large absolute value. If the fluorescence area ratio is too large, light provided by the optical sheet 125 (see FIGS. 11A and B) to the front may not be uniform in terms of color. For example, if the fluorescence area ratio is too large, light provided in front of the optical sheet 125 (see FIGS. 11A and B) at a position adjacent to the light source 203 (see FIGS. 11A and B) may appear yellow or red compared to the surroundings. have.

The fluorescence area ratio may have an optimal value so that the improvement color temperature difference (afd) approaches zero. The absolute value of the improved color temperature difference may rapidly change within the range of 17 pecents (%). The absolute value of the improved color temperature difference may rapidly approach zero while the fluorescence area ratio exceeds at less than 17% (%). That is, the fluorescence area ratio may have a critical significance at 17 percent (%).

The absolute value of the improved color temperature difference may rapidly change within the range of 25 percent (%) of the fluorescence area. The absolute value of the improved color temperature difference may rapidly approach zero while the fluorescence area ratio becomes less than 25 percent (%). That is, the fluorescence area ratio may have a critical significance at 25 percent (%). Since the absolute value of the improved color temperature difference is close to zero when the fluorescence area ratio is 17 to 25 percent (%), the fluorescence area ratio is 17 to 25 percent (%) may have technical significance.

Certain or other embodiments of the present invention described above are not mutually exclusive or distinct. Certain or other embodiments of the present invention described above may have their respective configurations or functions used in combination or combination.

The above detailed description should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

110: display panel 120: backlight unit
122: substrate 124b: lens
125: optical sheet 125f: first fluorescent layer
203: light source AFL: second fluorescent layer

Claims (23)

Display panel;
An optical sheet disposed behind the display panel and including a first fluorescent material; And,
An optical assembly disposed behind the optical sheet and providing light to the optical sheet,
The optical assembly:
A substrate facing the optical sheet and spaced apart from the optical sheet;
A light source mounted on the front surface of the substrate and providing light to the optical sheet;
A lens mounted on the front surface of the substrate and covering the light source;
A second fluorescent material positioned between the lens and the substrate; And
Including; a lens hole reflective sheet positioned between the lens and the substrate,
The second fluorescent material,
Located between the lens hole reflection sheet and the lens,
Display device. The method of claim 1,
The lens,
A bottom surface facing the substrate;
An upper surface facing the bottom surface; And
Including a side surface extending from the bottom surface to the upper surface,
The upper surface and the side surface are convex outwardly of the lens with respect to the bottom surface,
The second fluorescent material is adjacent to the light source,
Display device. The method of claim 1,
The lens,
A bottom surface facing the substrate;
An upper surface facing the bottom surface and concave to the outside of the lens based on the bottom surface; And
Including a side surface extending from the bottom surface to the upper surface,
The second fluorescent material is adjacent to the side surface of the lens,
Display device. The method of claim 1,
The lens includes a bottom surface facing the substrate,
The ratio of the area of the second fluorescent material to the area of the bottom surface of the lens is 17 to 25 percent (%),
Display device. The method of claim 1,
The light source provides blue-based light,
The first fluorescent material includes yellow-based and red-based phosphors,
Display device. The method of claim 5,
The display device, wherein the second fluorescent material includes yellow-based and red-based phosphors. The method of claim 6,
The second fluorescent material has the same optical properties as the first fluorescent material,
The optical sheet provides white light to the display panel,
Display device. The method of claim 1,
The second fluorescent material is attached to the substrate. delete The method of claim 1,
The second fluorescent material is attached to the lens. The method of claim 1,
The second fluorescent material,
Having the shape of a ring surrounding the light source,
Display device. The method of claim 11,
The second fluorescent material,
A first additional fluorescent material having a ring shape surrounding the light source,
Including a second additional fluorescent material having a shape of a ring surrounding the first additional fluorescent material,
Display device. The method of claim 1,
The second fluorescent material,
Including a plurality of dots (dots) containing a phosphor,
Display device. The method of claim 13,
The plurality of dots,
The closer to the light source, the larger,
Display device. The method of claim 13,
The plurality of dots,
The closer to the light source, the smaller,
Display device. Display panel;
An optical sheet disposed behind the display panel and including a first fluorescent layer; And,
An optical assembly disposed behind the optical sheet and providing light to the first fluorescent layer,
The optical assembly:
A substrate facing the first fluorescent layer and spaced apart from the first fluorescent layer;
A light source mounted on the front surface of the substrate and providing light to the first fluorescent layer;
A lens mounted on the front surface of the substrate and covering the light source;
A second fluorescent layer formed on the entire surface of the substrate; And
Including; a lens hole reflective sheet positioned between the lens and the substrate and disposed to be overlapped in the lens,
The second fluorescent layer,
Located between the lens hole reflection sheet and the lens, overlapping and disposed within the lens, printed and attached to the lens hole reflection sheet,
Display device. The method of claim 16,
The lens,
A bottom surface facing the substrate; And
It is formed on the bottom surface and includes a foot of the lens extending toward the substrate,
The second fluorescent layer,
Located outside the foot of the lens,
Display device. The method of claim 16,
The second fluorescent layer,
Surrounding the light source,
Display device. The method of claim 16,
The second fluorescent layer,
Including a plurality of dots (dots) containing a phosphor,
Display device. The method of claim 19,
The plurality of dots,
A first area adjacent to the light source and a second area spaced apart from the light source compared to the first area have different sizes,
Display device. The method of claim 16,
The light source provides blue-based light,
The first fluorescent layer comprises yellow-based and red-based phosphors,
Display device. The method of claim 21,
The display device, wherein the second fluorescent layer includes yellow-based and red-based phosphors. The method of claim 22,
The second fluorescent layer has the same optical properties as the first fluorescent layer,
The optical sheet provides white light to the display panel,
Display device.

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