KR20220099072A - Display apparatus - Google Patents

Abstract

A display apparatus comprises: a liquid crystal panel; and a light source device which irradiates light to the liquid crystal panel. The light source device includes: a plurality of light sources which emit blue light; and a reflective sheet which has a plurality of holes through which the plurality of light sources respectively pass. The plurality of holes include a first hole disposed at an edge portion of the reflective sheet. The light source device further includes a plurality of first light conversion patches disposed on the reflective sheet along the circumference of a circle surrounding the first hole. Each of the plurality of first light conversion patches includes at least one of a yellow fluorescent material, a yellow dye, and a yellow pigment.

Description

display device {DISPLAY APPARATUS}

The disclosed invention relates to a display device, and relates to a thin display device and a light source module thereof.

In general, a display device is a type of output device that converts acquired or stored electrical information into visual information and displays it to a user, and is used in various fields such as homes and businesses.

As a display device, a monitor device connected to a personal computer or a server computer, etc., a portable computer device, a navigation terminal device, a general television device, an Internet Protocol television (IPTV) device, a smart phone, a tablet PC, A personal digital assistant (PDA), a portable terminal device such as a cellular phone, various display devices used to reproduce images such as advertisements or movies in an industrial field, or various other audio/video systems etc.

The display device includes a light source module to convert electrical information into visual information, and the light source module includes a plurality of light sources for independently emitting light. Each of the plurality of light sources includes, for example, a Light Emitting Diode (LED) or an Organic Light Emitting Diode (OLED). For example, a light emitting diode or an organic light emitting diode may be mounted on a circuit board or substrate.

Recently, the thickness of the display device is getting thinner. In order to realize a thin display device, the thickness of the light source module is also getting thinner. Since the thickness of the light source module is reduced, the light source may be miniaturized and the number of light sources disposed in the light source module may be increased. The miniaturization of the light source and the increase in the number of light sources may cause an optical defect (eg, muar) of the light source module that has not been previously discovered.

An aspect of the disclosed invention is to provide a display device capable of preventing or suppressing an optical defect (eg, mura).

A display device according to an aspect of the disclosed disease includes a liquid crystal panel; and a light source device irradiating light to the liquid crystal panel. The light source device may include a plurality of light sources emitting blue light; and a reflective sheet having a plurality of holes through which the plurality of light sources pass, respectively, wherein a distance between a first hole disposed at an edge portion of the reflective sheet and an edge of the reflective sheet is equal to the plurality of holes. A second hole greater than a distance between the edge of the reflective sheet and the first hole may be included. The light source device may include a plurality of first light conversion patches disposed on the reflective sheet along a circumference of a circle surrounding the first hole, and disposed on the reflection sheet along a circumference of a circle surrounding the second hole and a plurality of second light conversion patches that become Each of the conversion patches may include at least one of a yellow fluorescent material, a yellow dye, or a yellow pigment.

A display device according to an aspect of the disclosed disease includes a liquid crystal panel; and a light source device irradiating light to the liquid crystal panel. The light source device may include a plurality of light sources emitting blue light; and a reflective sheet having a plurality of holes through which the plurality of light sources pass, respectively, wherein the plurality of holes are disposed at an edge of the reflective sheet rather than a first hole and the first hole disposed at an edge portion of the reflective sheet. It may include a second hole formed further away. The light source device includes first light conversion patches disposed around the first hole of the reflective sheet and second light conversion patches disposed around the second hole of the reflective sheet, wherein the first light conversion An areal density of the patches may be greater than an areal density of the second light conversion patches.

According to one aspect of the disclosed invention, it is possible to provide a display device capable of preventing or suppressing an optical defect (eg, mura).

1 illustrates an appearance of a display device according to an exemplary embodiment.
2 is an exploded view of a display device according to an exemplary embodiment.
3 illustrates a liquid crystal panel of a display device according to an exemplary embodiment.
4 is an exploded view of a light source device of a display device according to an exemplary embodiment.
5 is a perspective view of a light source included in a light source device according to an exemplary embodiment.
6 illustrates an example of a light emitting diode included in a light source device according to an embodiment.
5 illustrates an example of a reflective sheet included in a light source device according to an embodiment.
6 illustrates an example of a light emitting diode included in a light source device according to an embodiment.
7 illustrates a path of light in a light source device according to an exemplary embodiment.
8 is a diagram illustrating a propagation path of light in a center portion and an edge portion of a light source device according to an exemplary embodiment.
9 illustrates a light conversion patch disposed on an edge portion of a light source device according to an exemplary embodiment.
10 illustrates an example of the arrangement of the light conversion patch at the left and right edge portions of the light source device according to an embodiment.
11 illustrates an example of arrangement of a light conversion patch at a corner portion of a light source device according to an embodiment.
12 illustrates an example of a light conversion patch disposed on left and right edge portions of a light source device according to an embodiment.
13 illustrates an example of a light conversion patch disposed on left and right edge portions of a light source device according to an embodiment.
14 illustrates an example of a light conversion patch disposed on left and right edge portions of a light source device according to an exemplary embodiment.
15 illustrates an example of a light conversion patch disposed on left and right edge portions of a light source device according to an embodiment.
16 illustrates an example of a light conversion band disposed on left and right edge portions of a light source device according to an embodiment.
17 illustrates an example of a light conversion band disposed on left and right edge portions of a light source device according to an exemplary embodiment.
18 illustrates an example of a light conversion line disposed on left and right edge portions of a light source device according to an exemplary embodiment.
19 illustrates an example of a light conversion line disposed on left and right edge portions of a light source device according to an exemplary embodiment.
20 illustrates an example of a light conversion region disposed on left and right edge portions of a light source device according to an exemplary embodiment.
21 illustrates an example of a light conversion region disposed on left and right edge portions of a light source device according to an exemplary embodiment.
22 illustrates a light conversion patch disposed on an edge portion of a light source device according to an exemplary embodiment.

Like reference numerals refer to like elements throughout. This specification does not describe all elements of the embodiments, and general content in the technical field to which the present invention pertains or content that overlaps between the embodiments is omitted. The term 'part, module, member, block' used in the specification may be implemented in software or hardware, and according to embodiments, a plurality of 'part, module, member, block' may be implemented as a single component, It is also possible for one 'part, module, member, block' to include a plurality of components.

Throughout the specification, when a part is "connected" with another part, it includes not only a direct connection but also an indirect connection, and the indirect connection includes connection through a wireless communication network. do.

Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

Throughout the specification, when a member is said to be located "on" another member, this includes not only a case in which a member is in contact with another member but also a case in which another member exists between the two members.

Terms such as first, second, etc. are used to distinguish one component from another, and the component is not limited by the above-mentioned terms.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In each step, the identification code is used for convenience of description, and the identification code does not describe the order of each step, and each step may be performed differently from the specified order unless the specific order is clearly stated in the context. have.

Hereinafter, the working principle and embodiments of the present invention will be described with reference to the accompanying drawings.

1 illustrates an appearance of a display device according to an exemplary embodiment.

The display device 1 is a device capable of processing an image signal received from the outside and visually displaying the processed image. Hereinafter, a case in which the display device 1 is a television (Television, TV) is exemplified, but the present invention is not limited thereto. For example, the display device 1 may be implemented in various forms such as a monitor, a portable multimedia device, a portable communication device, etc., and the display device 1 is not limited as long as it is a device that visually displays an image. .

In addition, the display device 1 may be a large format display (LFD) installed outdoors such as on the roof of a building or at a bus stop. Here, the outdoors is not necessarily limited to the outdoors, and the display device 1 according to an embodiment may be installed in a place where a large number of people can enter and exit even indoors, such as a subway station, a shopping mall, a movie theater, a company, or a store.

The display apparatus 1 may receive content including a video signal and an audio signal from various content sources, and may output video and audio corresponding to the video signal and the audio signal. For example, the display apparatus 1 may receive content data through a broadcast reception antenna or a wired cable, receive content data from a content reproduction device, or receive content data from a content providing server of a content provider.

As shown in FIG. 1 , the display device 1 may include a main body 11 and/or a screen 12 displaying an image I.

The main body 11 forms the exterior of the display apparatus 1 , and parts for the display apparatus 1 to display the image I or perform various functions may be provided inside the main body 11 . The body 11 shown in FIG. 1 has a flat plate shape, but the shape of the body 11 is not limited to that shown in FIG. 1 . For example, the body 11 may have a curved plate shape.

The screen 12 is formed on the front surface of the main body 11 and can display the image I. For example, the screen 12 may display a still image or a moving image. In addition, the screen 12 may display a two-dimensional flat image or a three-dimensional stereoscopic image using the parallax of the user's eyes.

The screen 12 may include, for example, a self-luminous panel (eg, a light emitting diode panel or an organic light emitting diode panel) capable of emitting light directly or emitted by a light source device (eg, a backlight unit) or the like. It may include a non-emissive panel (eg, a liquid crystal panel) that can pass or block light.

A plurality of pixels P are formed on the screen 12 , and an image I displayed on the screen 12 may be formed by light emitted from each of the plurality of pixels P. For example, the image I may be formed on the screen 12 by combining the light emitted by each of the plurality of pixels P like a mosaic.

Each of the plurality of pixels P may emit light of various brightnesses and/or different colors. In order to emit light of various colors, each of the plurality of pixels P may include sub-pixels P _R , P _G , and P _B .

The sub-pixels P _R , P _G , and P _B are a red sub-pixel P _R capable of emitting red light, a green sub-pixel P _G capable of emitting green light, and a blue light emitting device. It may include a blue sub-pixel P _B that can do this. For example, red light may represent light with a wavelength of approximately 620 nm (nanometer, billionths of a meter) to 750 nm, green light may represent light with a wavelength of approximately 495 nm to 570 nm, and blue light may represent light with a wavelength of approximately 495 nm to 570 nm. It can represent light with a wavelength of approximately 450 nm to 495 nm.

By a combination of the red light of the red sub-pixel PR, the green light of the green sub-pixel PG, and/or the blue light of the blue sub-pixel PB, light of various brightnesses and different colors in each of the plurality of pixels P This can be ejected.

2 is an exploded view of a display device according to an exemplary embodiment. 3 illustrates a liquid crystal panel of a display device according to an exemplary embodiment.

As shown in FIG. 2 , various components for generating the image I on the screen S may be provided inside the body 11 .

For example, the main body 11 includes a light source device 100 that is a surface light source, a liquid crystal panel 20 that blocks or passes light emitted from the light source device 100 , the light source device 100 and/or Alternatively, the control assembly 50 for controlling the operation of the liquid crystal panel 20 or the power assembly 60 for supplying power to the light source device 100 and/or the liquid crystal panel 20 is provided. In addition, the main body 11 includes a bezel 13 for supporting and fixing the liquid crystal panel 20 , the light source device 100 , the control assembly 50 and/or the power assembly 60 , and a frame middle mold 14 , and It may include a bottom chassis 15 and a rear cover 16 .

The light source device 100 may include a point light source emitting monochromatic light or white light, and may refract, reflect, and/or scatter light to convert light emitted from the point light source into uniform surface light. As such, the light source device 100 may emit uniform surface light toward the front by refracting, reflecting, and/or scattering light emitted from the point light source.

The light source device 100 will be described in more detail below.

The liquid crystal panel 20 is provided in front of the light source device 100 and blocks or passes light emitted from the light source device 100 to form the image I.

The front surface of the liquid crystal panel 20 forms the screen S of the display device 1 described above, and the liquid crystal panel 20 may form a plurality of pixels P. In the liquid crystal panel 20 , the plurality of pixels P may each independently block or pass the light of the light source device 100 , and the light passed by the plurality of pixels P may be transmitted to the screen S. The displayed image I may be formed.

For example, as shown in FIG. 3 , the liquid crystal panel 20 includes a first polarizing film 21 , a first transparent substrate 22 , a pixel electrode 23 , a thin film transistor 24 , and a liquid crystal layer 25 . , a common electrode 26 , a color filter 27 , a second transparent substrate 28 , and a second polarizing film 29 .

The first transparent substrate 22 and/or the second transparent substrate 28 includes a pixel electrode 23 , a thin film transistor 24 , a liquid crystal layer 25 , a common electrode 26 and/or a color filter 27 . can be fixedly supported. The first transparent substrate 22 and/or the second transparent substrate 28 may be made of tempered glass or a transparent resin.

The first polarizing film 21 and/or the second polarizing film 29 are provided outside the first transparent substrate 22 and/or the second transparent substrate 28 . The first polarizing film 21 and the second polarizing film 29 may pass a specific polarized light and block (reflect or absorb) other polarized light, respectively. For example, the first polarizing film 21 may pass polarized light in the first direction and block (reflect or absorb) other polarized light. In addition, the second polarizing film 29 may pass the polarized light in the second direction and block (reflect or absorb) the other polarized light. In this case, the first direction and the second direction may be orthogonal to each other. Therefore, the polarized light passing through the first polarizing film 21 cannot pass through the second polarizing film 29 .

The color filter 27 may be provided inside the second transparent substrate 28 . The color filter 27 may include, for example, a red filter 27R for passing red light, a green filter 27G for passing green light, and a blue filter 27G for passing blue light. The filter 27R, the green filter 27G, and the blue filter 27B may be arranged side by side. The area occupied by the color filter 27 corresponds to the pixel P described above. The area occupied by the red filter 27R corresponds to the red sub-pixel P _R , the area occupied by the green filter 27G corresponds to the green sub-pixel P _G , and the area occupied by the blue filter 27B corresponds to the green sub-pixel P G . The area corresponds to the blue sub-pixel P _B .

The pixel electrode 23 may be provided inside the first transparent substrate 22 , and the common electrode 26 may be provided inside the second transparent substrate 28 . The pixel electrode 23 and the common electrode 26 are made of a conductive metal material, and can generate an electric field for changing the arrangement of the liquid crystal molecules 115a constituting the liquid crystal layer 25 to be described below. have.

A thin film transistor (TFT) 24 is provided inside the second transparent substrate 22 . The thin film transistor 24 may pass or block a current flowing through the pixel electrode 23 . For example, an electric field may be formed or removed between the pixel electrode 23 and the common electrode 26 according to the turn-on (closed) or turn-off (open) of the thin film transistor 24 .

The liquid crystal layer 25 is formed between the pixel electrode 23 and the common electrode 26 and is filled by liquid crystal molecules 25a. Liquid crystal represents an intermediate state between a solid (crystal) and a liquid. Liquid crystals may exhibit optical properties according to changes in an electric field. For example, in the liquid crystal, the direction of the arrangement of molecules constituting the liquid crystal may change according to a change in an electric field. Accordingly, the optical properties of the liquid crystal layer 25 may vary depending on the presence or absence of an electric field passing through the liquid crystal layer 25 .

On one side of the liquid crystal panel 20, a cable 20a for transmitting image data to the liquid crystal panel 20, and a display driver integrated circuit (DDI) for processing digital image data and outputting an analog image signal (30) (hereinafter referred to as a 'panel driver') is provided.

The cable 20a may electrically connect the control assembly 50/power assembly 60 and the panel driver 30 , and may also electrically connect the panel driver 30 and the liquid crystal panel 20 . The cable 20a may include a flexible flat cable or a film cable that can be bent.

The panel driver 30 receives image data and/or power from the control assembly 50/power assembly 60 through the cable 20a, and transmits the image data and/or power to the liquid crystal panel 20 through the cable 20a. Alternatively, a drive current may be provided.

Further, the cable 20a and the panel driver 30 may be integrally implemented as a film cable, a chip on film (COF), a tape carrier package (TCP), or the like. In other words, the panel driver 30 may be disposed on the cable 20b. However, the present invention is not limited thereto, and the panel driver 30 may be disposed on the liquid crystal panel 20 .

The control assembly 50 may include a control circuit for controlling the operation of the liquid crystal panel 20 and/or the light source device 100 . For example, the control circuit may process image data received from an external content source, transmit image data to the liquid crystal panel 20 , and transmit dimming data to the light source device 100 .

The power assembly 60 supplies power to the light source device 100 so that the light source device 100 outputs surface light, and the liquid crystal panel 20 blocks or passes the light from the light source device 100 . ) can be supplied with power.

The control assembly 50 and the power assembly 60 may be implemented as a printed circuit board and various circuits mounted on the printed circuit board. For example, the power circuit may include a capacitor, a coil, a resistor, a processor, and the like, and a power circuit board on which these are mounted. In addition, the control circuit may include a memory, a processor, and a control circuit board on which they are mounted.

4 is an exploded view of a light source device of a display device according to an exemplary embodiment. 5 is a perspective view of a light source included in a light source device according to an exemplary embodiment. 6 illustrates an example of a light emitting diode included in a light source device according to an embodiment.

As shown in FIG. 4 , the light source device 100 includes a light source module 110 for generating light, a reflective sheet 120 for reflecting light, and a diffuser plate 130 for uniformly diffusing light. , may include an optical sheet 140 that improves the luminance of the emitted light.

The light source module 110 may include a plurality of light sources 111 emitting light and a substrate 112 supporting/fixing the plurality of light sources 111 .

The plurality of light sources 111 may be arranged in a predetermined pattern so that light is emitted with uniform luminance. The plurality of light sources 111 may be arranged such that a distance between one light source and light sources adjacent thereto is the same.

For example, as shown in FIG. 4 , the plurality of light sources 111 may be arranged in rows and columns. Thereby, a plurality of light sources may be arranged such that a substantially square is formed by four adjacent light sources. In addition, any one light source may be disposed adjacent to the four light sources, and a distance between one light source and the four light sources adjacent thereto may be approximately the same.

As another example, a plurality of light sources may be arranged in a plurality of rows, and a light source belonging to each row may be arranged at the center of two light sources belonging to an adjacent row. Thereby, a plurality of light sources may be arranged such that an approximately equilateral triangle is formed by three adjacent light sources. In this case, one light source is disposed adjacent to six light sources, and a distance between one light source and six light sources adjacent thereto may be approximately the same.

However, the arrangement of the plurality of light sources 111 is not limited to the arrangement described above, and the plurality of light sources 111 may be arranged in various ways so that light is emitted with uniform luminance.

When power is supplied, the light source 111 may emit monochromatic light (light having a specific range of wavelengths or light having one peak wavelength, for example, blue light) or white light (light having a plurality of peak wavelengths, for example, red light). , a device capable of emitting green light and/or a mixture of blue light) in various directions may be employed.

Each of the plurality of light sources 111 may include a light emitting diode (LED) 190 and an optical dome 180 .

The thickness of the optical apparatus 100 may also be reduced so that the thickness of the display apparatus 1 is reduced. Each of the plurality of light sources 111 is thinned so that the thickness of the optical device 100 is thin, and the structure thereof is simplified.

The light emitting diode 190 may be directly attached to the substrate 112 in a chip on board (COB) method. For example, the light source 111 may include a light emitting diode 190 to which a light emitting diode chip or a light emitting diode die is directly attached to the substrate 112 without separate packaging.

The light emitting diode 190 may be manufactured in a flip chip type. The flip chip type light emitting diode 190 does not use an intermediate medium such as a metal lead (wire) or a ball grid array (BGA) when attaching the light emitting diode, which is a semiconductor device, to the substrate 112, The electrode pattern of the semiconductor device may be fused to the substrate 112 as it is. As such, since the metal lead (wire) or the ball grid array is omitted, it is possible to reduce the size of the light source 111 including the flip chip type light emitting diode 190 .

For example, the light emitting diode 190 may be a DBR light emitting diode including a distributed Bragg reflector (DBR) as shown in FIG. 6 .

The light emitting diode 190 includes a transparent substrate 195 , an n-type semiconductor layer (eg, n-type GaN, n-type gallium nitride) 193 , and a p-type semiconductor layer (eg, p-type GaN). , p-type gallium nitride) 192 . A Multi Quantum Wells (MQW) layer 194 and electron-blocking layers (EBL) 197 are formed between the n-type semiconductor layer 193 and the p-type semiconductor layer 192 . When a current is supplied to the light emitting diode 190 , light may be emitted by recombination of electrons and holes in the multi-quantum well layer 194 .

The first electrode 191a of the light emitting diode 190 is in electrical contact with the p-type semiconductor layer 192 , and the second electrode 191b is in electrical contact with the n-type semiconductor layer 193 . The first electrode 191a and the second electrode 191b may function not only as electrodes, but also as reflectors that reflect light.

A DBR layer 196 is provided on the outside of the transparent substrate 195 . The DBR layer 196 may be formed by stacking materials having different refractive indices, and the DBR layer 196 may reflect incident light. Since the DBR layer 196 is provided on the outside (upper side in the drawing) of the transparent substrate 195 , light perpendicularly incident on the DBR layer 196 may be reflected by the DBR layer 196 . Therefore, the intensity of light emitted in the direction perpendicular to the DBR layer 196 (upward direction of the light emitting diode in the drawing) (D1) is in a direction inclined with respect to the DBR layer 196 (for example, the upper direction in the drawing). (direction inclined by approximately 60 degrees from the direction) (D2) is less than the intensity of the light emitted. In other words, the light emitting diode 190 may emit stronger light in the lateral direction than in the vertical direction.

Although the flip-chip type light emitting diode 190 that is directly fused to the substrate 112 in a chip-on-board method has been described in the above, the light source 111 is not limited to the flip chip type light emitting diode. For example, the light source 111 may include a package type light emitting diode.

The optical dome 180 may cover the light emitting diode 190 . The optical dome 180 may prevent or suppress damage to the light emitting diode 190 by an external mechanical action and/or damage to the light emitting diode 190 by a chemical action.

The optical dome 180 may have, for example, a dome shape in which a sphere is cut by a surface not including the center, or a hemispherical shape in which a sphere is cut by a surface including the center. The vertical cross-section of the optical dome 180 may be, for example, arcuate or semicircular in shape.

The optical dome 180 may be made of silicone or epoxy resin. For example, the molten silicone or epoxy resin is discharged on the light emitting diode 190 through a nozzle or the like, and then the discharged silicone or epoxy resin is cured to form the optical dome 180 .

Accordingly, the shape of the optical dome 180 may vary depending on the viscosity of the liquid silicone or epoxy resin. For example, when the optical dome 180 is manufactured using silicon having a thixotropic index of approximately 2.7 to 3.3 (preferably 3.0), the ratio of the height of the dome to the diameter of the base of the dome (the dome An optical dome 180 having a dome ratio representing a height of / diameter of the base) of approximately 0.25 to 0.31 (preferably 0.28) may be formed. For example, the diameter of the underside of the optical dome 180 made of silicon having a thixotropic index of approximately 2.7 to 3.3 (preferably 3.0) may be approximately 2.5 mm (millimeter, 1/1,000 meter). have. The diameter of the optical dome 180 may have an error of approximately ㅁ20%, and may be between approximately 2.0 mm and 3.0 mm. The height of the optical dome 180 may preferably be approximately 0.7 mm. The height of the optical dome 180 may have an error of approximately ㅁ20%, and may be between approximately 0.5 mm and 0.9 mm.

However, the diameter (or size) of the optical dome 180 is not limited thereto, and the diameter (or size) of the optical dome 180 may be approximately several hundred μm (micrometer, 1/1,000,000 meter) to several tens of mm.

Optical dome 180 may be optically transparent or translucent. Light emitted from the light emitting diode 190 may pass through the optical dome 180 and be emitted to the outside.

In this case, the dome-shaped optical dome 180 may refract light like a lens. For example, light emitted from the light emitting diode 190 may be scattered by being refracted by the optical dome 180 .

As such, the optical dome 180 may not only protect the light emitting diode 190 from external mechanical action and/or chemical action or electrical action, but may also disperse light emitted from the light emitting diode 190 .

In the above, the optical dome 180 in the form of a silicon dome has been described, but the light source 111 is not limited to including the optical dome 180 . For example, the light source 111 may include a lens for dispersing light emitted from the light emitting diode.

The substrate 112 may fix the plurality of light sources 111 so that the positions of the light sources 111 are not changed. In addition, the substrate 112 may supply power for the light source 111 to emit light to each light source 111 .

The substrate 112 is composed of a synthetic resin or tempered glass or a printed circuit board (PCB) in which a conductive power supply line for fixing a plurality of light sources 111 and supplying power to the light source 111 is formed. can

The reflective sheet 120 may reflect the light emitted from the plurality of light sources 111 forward or in a direction close to the front.

A plurality of through holes 120a may be formed in the reflective sheet 120 at positions corresponding to each of the plurality of light sources 111 of the light source module 110 . In addition, the light source 111 of the light source module 110 may pass through the through holes 120a and protrude in front of the reflective sheet 120 . Accordingly, the plurality of light sources 111 may emit light from the front of the reflective sheet 120 . The reflective sheet 120 may reflect light emitted from the plurality of light sources 111 toward the reflective sheet 120 toward the diffusion plate 130 .

The size and arrangement of the through holes 120a may depend on the size and arrangement of the light source 111 . For example, when the diameter of the light source 111 is approximately 2.5 mm, the diameter of the through holes 120a may be preferably 4.5 mm. The diameter of the through-holes 120a may have an error of approximately ㅁ20%, and may be between approximately 3.5 mm and 5.5 mm. In addition, the distance between the centers of the through holes 120a may be preferably 11 mm. The distance between the centers of the through-holes 120a may have an error of approximately ㅁ20%, and may be between approximately 8.5 mm and 13.5 mm.

The diffusion plate 130 may be provided in front of the light source module 110 and/or the reflective sheet 120 , and may evenly distribute the light emitted from the light source 111 of the light source module 110 .

As described above, the plurality of light sources 111 may be disposed at equal intervals on the rear surface of the light source device 100 . Accordingly, the luminance may be non-uniform depending on the positions of the plurality of light sources 111 .

The diffusion plate 130 may diffuse the light emitted from the plurality of light sources 111 in the diffusion plate 130 in order to remove non-uniformity in luminance due to the plurality of light sources 111 . In other words, the diffusion plate 130 may uniformly emit the non-uniform light from the plurality of light sources 111 to the front.

The optical sheet 140 may include various sheets to improve luminance and also to improve luminance uniformity. For example, the optical sheet 140 may include a light conversion sheet 141 , a diffusion sheet 142 , a prism sheet 143 , a reflective polarizing sheet 144 , and the like.

The light conversion sheet 141 may convert a wavelength of a part of the incident light. For example, the light conversion sheet 141 may include a quantum dot (QD) material or a fluorescent material. Depending on the constituent material, the light conversion sheet 141 may be referred to as a fluorescent sheet or a quantum dot sheet.

Quantum dots refer to small spherical semiconductor particles of nanometer (nm, 1,000,000,000th of a meter) size, and are composed of a core of approximately 2 nanometers [nm] to 10 [nm] and a shell made of zinc sulfide (ZnS). can be configured. Here, cadmium selenite (CdSe), cadmium telluride (CdTe), cadmium sulfide (CdS), or the like may be used as the core of the quantum dot.

Quantum dots can emit light of a specific wavelength by itself when an electric field is applied, or can emit light of a specific wavelength when absorbing high-energy light. In this case, the wavelength of the emitted light may depend on the size of the quantum dot. The smaller the size of the quantum dot, the shorter the wavelength of light, and the larger the size, the longer the light. For example, a quantum dot approximately 2 nm in diameter may emit light approximately blue, a quantum dot approximately 3 nm in diameter may emit light approximately green, and a quantum dot approximately 6 nm in diameter may emit light approximately red. can be released

A material in which quantum dots having a diameter of approximately 3 nm and quantum dots having a diameter of approximately 6 nm are mixed can absorb blue light or ultraviolet light and emit green light and/or red light. For example, when blue light or ultraviolet light is incident on the light conversion sheet 141 in which quantum dots having a diameter of approximately 3 nm and quantum dots having a diameter of approximately 6 nm are mixed, some of the blue light or ultraviolet light is converted into green light and/or red light, and the other part is converted to green light and/or red light. may pass through the light conversion sheet 141 . As a result, white light in which blue light, green light, and/or red light are mixed may be emitted from the light conversion sheet 141 .

The fluorescent material may convert blue light to yellow or orange or blue light to red and/or green light.

The light conversion sheet 141 may include a yellow (YAG) phosphor that converts blue light into yellow or orange, or a red/green (RG) phosphor that converts blue light into red and/or green light. For example, the light conversion sheet 141 may include a KSF (K2SiF6) phosphor or a KTF (K2TiF6) phosphor.

The diffusion sheet 142 may diffuse light in order to improve the uniformity of the light passing through the light conversion sheet 141 .

The prism sheet 143 may deflect the light passing through the diffusion sheet 142 toward the front of the light source device 100 (eg, a direction normal to a plane defined by the light source device). For example, light may be emitted from the diffusion sheet 142 in an oblique direction due to diffusion in the diffusion sheet 142 . The prism sheet 143 may deflect light in a direction normal to a plane defined by the prism sheet 143 by using refraction of light.

The reflective polarizing sheet 144 may pass some of the incident light and reflect another portion. For example, the reflective polarizing sheet 144 may pass P-polarized light (P-polarized) and reflect S-polarized light (S-polarized). In general, since the polarizing sheet absorbs polarized light, the luminance of the light source device may be reduced. On the other hand, the reflective polarizing sheet 144 reflects the polarized light, so that the reflected light may be recycled in the light source device 100 .

The stacking order of the optical sheet 140 is not limited to that shown in FIG. 4 . For example, the optical sheet 140 is stacked in the order of diffusion sheet 142 -> optical change sheet 141 -> prism sheet 143 -> reflective polarizing sheet 144, or diffusion sheet 142 - >Prism sheet 143->Optical change sheet 141->Reflective polarizing sheet 144 may be stacked in the order.

In addition, the optical sheet 140 is not limited to the sheet or film shown in FIG. 4 , and may include more various sheets or films, such as a protective sheet.

7 illustrates a path of light in a light source device according to an exemplary embodiment. 8 is a diagram illustrating a propagation path of light in a center portion and an edge portion of a light source device according to an exemplary embodiment. 9 illustrates a light conversion patch disposed on an edge portion of a light source device according to an exemplary embodiment.

7 and 8 , the light source device 100 may include a light source module 110 , a reflective sheet 120 , a diffusion plate 130 , and/or an optical sheet 140 .

The light source module 110 includes a plurality of point light sources 111 , and light emitted from the plurality of point light sources 111 passes through the diffusion plate 130 and/or the optical sheet 140 and is converted into uniform light. can be

For example, as shown in FIG. 7 , the light L1 may be emitted from the light source 111 . Light L1 may include, for example, blue light whose wavelength is between approximately 450 nm and 495 nm.

The light L1 may pass through the diffusion plate 130 and be incident on the optical sheet 140 . The light L1 may pass through the optical sheet 140 or may be reflected from the optical sheet 140 . In addition, although not shown in the drawings, some of the light L1 may be absorbed by the diffusion plate 130 and/or the optical sheet 140 . The absorbed light may be converted to heat in the diffuser plate 130 and/or the optical sheet 140 .

Some of the lights L1 may pass through the optical sheet 140 and be emitted to the outside of the light source device 100 . In particular, light L2 emitted from the light source device 100 may pass through the light conversion sheet 141 included in the optical sheet 140 . The wavelength of a part of the light L2 may be changed while passing through the light conversion sheet 141 .

For example, a portion of blue light included in the light may pass through the light conversion sheet 141 , and the other portion may be converted into red light and/or green light by the light conversion sheet 141 . Accordingly, the ratio of the blue light of the light passing through the optical sheet 140 may decrease, and the ratio of the red light and/or the green light may increase.

Some other light L3 of the light L1 may be reflected from the optical sheet 140 . For example, the light L3 may be reflected from the reflective polarizing sheet 144 . In this way, as a portion of the light is reflected from the reflective polarizing sheet 144, light absorbed by the polarizing sheets 21 and 29 of the liquid crystal panel 20 can be reduced, thereby increasing the light recycling efficiency and increasing the display device ( The luminance of 1) can be improved.

In addition, light L3 reflected from the reflective polarizing sheet 144 may pass through the light conversion sheet 141 . For example, light may pass through the light conversion sheet 141 before and after being reflected from the reflective polarizing sheet 144 , respectively. Accordingly, the ratio of the blue light of the light L3 reflected by the reflective polarizing sheet 144 may further decrease, and the ratio of the red light and/or the green light may further increase.

The light L3 may travel toward the reflective sheet 120 and be reflected from the reflective sheet 120 .

The light L4 reflected from the reflective sheet 120 may pass through the diffusion plate 130 again and be incident on the optical sheet 140 . The light L4 may pass through the optical sheet 140 or may be reflected off the optical sheet 140 .

Some of the lights L4 may pass through the optical sheet 140 and be emitted to the outside of the light source device 100 . The light L5 may pass through the light conversion sheet 141 included in the optical sheet 140 . The ratio of the blue light of the light L5 passing through the light conversion sheet 141 may further decrease, and the ratio of the red light and/or the green light may further increase.

While being reflected by the reflective polarizing sheet 144 and the reflective sheet 120 , the light passes through the light conversion sheet 141 several times, whereby blue light may be converted into red light and/or green light. Therefore, the ratio of the blue light of the light L5 having a small number of times reflected between the reflective polarizing sheet 144 and the reflective sheet 120 is the light having a large number of times reflected between the reflective polarizing sheet 144 and the reflective sheet 120 . It may be smaller than the ratio of the blue light of L2. Also, the ratio of the red light and/or green light of the light L5 may be greater than the ratio of the red light and/or the green light of the light L2.

In other words, the light L2 having a small number of reflections is bluish compared to the light L5 having a large number of reflections, and the light L5 is yellowish compared to the light L2. The light L2 and the light L5 are mixed with each other, and the white light in which the light L2 and the light L5 are mixed may be emitted from the light source device 100 . Also, the white light emitted from the light source device 100 may be incident on the liquid crystal panel 20 .

In this case, a mixing ratio of the bluish light L2 and the yellowish light L5 may be different depending on a location in the light source device 100 .

For example, at various positions P1 and P2 of the light source device 100 as shown in FIG. 8, a bluish light L2 and a yellowish light L5 are mixed, and the mixed light is mixed with the light source device ( 100) can be released.

The light emitted at the first position P1 of the central portion of the light source device 100 is the light L2 emitted from the light source 111 (or the number of times it has passed through the light conversion sheet is small), and the left reflective sheet of the light source 111 . Light L5 reflected by 120 (or passing through the light conversion sheet many times), and light L5 reflected by the right reflection sheet 120 of the light source 111 (or passing through the light conversion sheet many times) may include

The light emitted at the second position P2 of the edge portion of the light source device 100 is the light L2 emitted from the light source 111 (or the number of times it has passed through the light conversion sheet is small), and the right reflective sheet of the light source 111 . It may include light L5 that is reflected (or passed through the light conversion sheet many times) at 120 .

Accordingly, the proportion of the bluish light included in the light emitted at the second position P2 is smaller than the proportion of the bluish light included in the light emitted at the second position P2. In other words, light emitted from an edge portion of the light source device 100 is more bluish than light emitted from a central portion of the light source device 100 .

As such, a slight color difference between different positions in the same display device 1 can be easily recognized by a user. In other words, an edge portion of the light source device 100 is more bluish than a central portion of the light source device 100 , that is, an optical defect can be easily recognized by a user.

For example, when a blue (blue or green) image is displayed across the screen 12, such as an image of the sky or an image of a sports relay (eg, golf), the user can easily display the edge portion of the display device 1 . Optical defects can be easily recognized.

As another example, when a white image is displayed across the screen 12 like an image of a snowy scene, a user may easily recognize an optical defect in an edge portion of the display device 1 .

In order to prevent or suppress optical defects in the edge portion of the display device 1, a yellow fluorescent material, a red/green fluorescent material, and a yellow pigment are applied to the edge portion of the light source device 100 as shown in FIG. 9 . , the light conversion patch 200 including at least one of a red/green pigment, a yellow dye (dye), a red/green dye, or a red/green quantum dot material may be applied, printed, or coated.

For example, the light conversion patch 200 may be applied, printed, or coated on the edge portion of the reflective sheet 120 . The reflective sheet 120 may be divided into a first area representing an edge portion and a second area representing a center portion. The light conversion patch 200 may be applied, printed, or coated on the first area of the reflective sheet 120, and the light conversion patch 200 may not be applied, printed or coated on the second area of the reflective sheet 120. can

As another example, the light conversion patch 200 may be applied, printed, or coated on the edge portion of the substrate 112 . The substrate 112 may be divided into a first area representing an edge portion and a second area representing a center portion. The light conversion patch 200 may be applied, printed, or coated on the first area of the substrate 112 , and the light conversion patch 200 may not be applied, printed, or coated on the second area of the substrate 112 . .

The light conversion patch 200 may absorb a portion of the blue light among the incident light and convert a portion of the absorbed blue light into yellow light, red light, or green light. Also, the light conversion patch 200 may absorb blue light among incident light and reflect yellow light, red light, or green light.

Accordingly, in the light passing through the light conversion patch 200 , the ratio of blue light may decrease, and the ratio of yellow light, red light, or green light may increase.

As described above, the light emitted at the second position P2 of the edge portion of the light source device 100 is the light L2 emitted from the light source 111 (or reflected less frequently) and the right side of the light source 111 . The light L5 reflected from the reflective sheet 120 may be included.

The light conversion patch 200 may be applied, printed, or coated on the edge portion of the reflective sheet 120 . While the light L5 is reflected from the edge portion of the reflective sheet 120 , a portion of the blue light included in the light L5 may be converted into yellow light, red light, or green light by the light conversion patch 200 . Thereby, the proportion of blue light in the light L5 may decrease, and the proportion of yellow light may increase. In other words, light L5 may become more yellowish.

Accordingly, the ratio of the bluish light included in the light emitted at the second position P2 may be reduced, and the light emitted from the edge portion of the light source device 100 may become less bluish. In addition, a difference between the ratio of blue light in the edge portion of the light source device 100 and the ratio of blue light in the center portion of the light source device 100 may decrease to a level that the user cannot perceive.

Various shapes or patterns of the light conversion patch 200 may be applied, printed, or coated on the edge portion of the reflective sheet 120 or the edge portion of the substrate 112 .

For example, as shown in FIG. 9 , the light conversion patch 200 may be applied, printed, or coated to surround the through holes 120a on the edge portion of the reflective sheet 120 .

As described above, the reflective sheet 120 may be divided into a first area representing an edge portion and a second area representing a center portion. In the first area of the reflective sheet 120 , a through hole on which the light conversion patch 200 is applied, printed, or coated may be disposed around the first area. In the second region of the reflective sheet 120 , a through hole on which the light conversion patch 200 is applied or printed or not coated may be disposed around it.

However, the shape or pattern of the light conversion patch 200 shown in FIG. 9 is merely an example of applying, printing, or coating the light conversion patch 200 , and is not limited thereto.

The light conversion patch 200 may be applied, printed, or coated to surround the light source 111 on the edge portion of the substrate 112 . The light conversion patch 200 disposed on the edge portion of the substrate 112 may be exposed through the through hole 120a.

Hereinafter, various forms or patterns in which the light conversion patch 200 is applied, printed, or coated on the edge portion of the light source device 100 will be described.

10 illustrates an example of the arrangement of the light conversion patch at the left and right edge portions of the light source device according to an embodiment.

As shown in FIG. 10 , a plurality of through holes 120a through which the plurality of light sources 111 pass are formed in the reflective sheet 120 . In addition, on the edge portion of the reflective sheet 120 , the light conversion patch 200 may be applied, printed, or coated (hereinafter referred to as “disposed”).

The light conversion patch 200 may include a light conversion material that absorbs a portion of blue light among incident light and converts a portion of the absorbed blue light into yellow light, red light, or green light. The light conversion patch 200 may include, for example, at least one of a yellow fluorescent material, a red fluorescent material, a green fluorescent material, a red quantum dot material, or a green quantum dot material.

In addition, the light conversion patch 200 may include a light conversion material that absorbs a portion of blue light among the incident light and reflects yellow light, red light, or green light. The light conversion patch 200 may include, for example, at least one of a yellow pigment, a red pigment, a green pigment, a yellow dye, a red dye, or a green dye.

The light conversion patch 200 may be approximately circular or oval. In addition, at an edge portion of the reflective sheet 120 , the light conversion patch 200 may be disposed around the through holes 120a to surround the through holes 120a.

The light conversion patch 200 includes a plurality of first light conversion patches 210 disposed around the first through hole 121 disposed in the first row in the left and right edges 120b of the reflective sheet 120 . can do.

The size and/or the number of the first light conversion patches 210 may depend on the arrangement and size of the through holes 120a. When the distance between the through-holes 120a increases and the size of the through-holes 120a increases, the size of the first light conversion patches 210 increases or the number of the first light conversion patches 210 increases. can do.

For example, if the distance between the centers of the through-holes 120a is approximately 11.0 mm and the diameter of the through-holes 120a is approximately 4.5 mm, the first through-hole 121 is surrounded by eight first light conversion patches. 210 may be disposed. A diameter of each of the eight first light conversion patches 210 may be between approximately 1.0 mm and 2.0 mm. The diameter of each of the first light conversion patches 210 may be preferably about 1.5 mm, and there may be an error of ㅁ20%. In addition, according to an embodiment, each of the first light conversion patches 210 may have a diameter of approximately 1.3 mm or 1.1 mm.

The plurality of first light conversion patches 210 may be disposed at approximately equal intervals along an arc of a virtual circle surrounding the first through hole 121 . Also, the plurality of first light conversion patches 210 may be disposed at approximately equal angular intervals with respect to an imaginary central point inside the first through hole 121 . For example, the eight first light conversion patches 210 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the first through hole 121 .

The light conversion patch 200 includes a plurality of second light conversion patches 220 disposed around the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . can do.

The size and/or the number of the second light conversion patches 220 may depend on the arrangement and size of the through holes 120a. For example, if the distance between the centers of the through-holes 120a is approximately 11.0 mm and the diameter of the through-holes 120a is approximately 4.5 mm, the second through-hole 122 is surrounded by four second light conversion patches. 220 may be disposed. Each of the four second light conversion patches 220 may have a diameter of approximately 0.8 mm to 1.5 mm. The diameter of each of the second light conversion patches 220 may be preferably approximately 1.3 mm, and there may be an error of 20%. In addition, according to an embodiment, each of the second light conversion patches 220 may have a diameter of approximately 1.2 mm, 1.1 mm, or 0.9 mm.

The plurality of second light conversion patches 220 may be disposed at approximately equal intervals along an arc of a virtual circle surrounding the second through hole 122 . In addition, the plurality of second light conversion patches 220 may be disposed at approximately equal angular intervals with respect to an imaginary central point inside the second through hole 122 . For example, the four second light conversion patches 220 may be disposed at an angular interval of approximately 90 degrees with respect to an imaginary central point inside the second through hole 122 .

The light conversion patch 200 may include a plurality of third light conversion patches 230 disposed around the third through hole 123 disposed in the third row of the left and right edge portions of the reflective sheet 120 . .

The size and/or the number of the third light conversion patches 230 may depend on the arrangement and size of the through holes 120a. For example, if the distance between the centers of the through-holes 120a is approximately 11.0 mm and the diameter of the through-holes 120a is approximately 4.5 mm, three third light conversion patches are formed around the third through-hole 123 . 230 may be disposed. Each of the three third light conversion patches 230 may have a diameter of approximately 0.6 mm to 1.3 mm. Each of the third light conversion patches 230 may have a diameter of preferably about 1.1 mm, and there may be an error of 20%. In addition, according to an embodiment, each of the first light conversion patches 210 may have a diameter of approximately 0.9 mm or 0.7 mm.

The plurality of third light conversion patches 230 may be disposed along an arc of a virtual circle surrounding the third through hole 123 . For example, the three third light conversion patches 230 may be disposed at an angular interval of approximately 45 degrees or approximately 90 degrees with respect to an imaginary central point inside the third through hole 123 .

A diameter of each of the first light conversion patches 210 , the second light conversion patches 220 , and the third light conversion patches 230 may be variously combined. For example, a diameter of each of the first light conversion patches 210 , the second light conversion patches 220 , and the third light conversion patches 230 may be approximately 1.5 mm, approximately 1.3 mm, and approximately 1.1 mm. have. As another example, each of the first light conversion patches 210 , the second light conversion patches 220 , and the third light conversion patches 230 may have a diameter of approximately 1.3 mm, approximately 1.2 mm, and approximately 1.1 mm. . As another example, each of the first light conversion patches 210 , the second light conversion patches 220 , and the third light conversion patches 230 may have a diameter of approximately 1.3 mm, approximately 1.1 mm, and approximately 0.9 mm. . As another example, each of the first light conversion patches 210 , the second light conversion patches 220 , and the third light conversion patches 230 may have a diameter of approximately 1.1 mm, approximately 0.9 mm, and approximately 0.7 mm. .

The light conversion patch 200 is not only positioned around the through holes 120a of the edge portion of the reflective sheet 120 , but also between the through holes 120a and the through holes 120a of the edge portion of the reflective sheet 120 . may be placed in

For example, three light conversion conversion patches may be disposed between the first through hole 121 and the second through hole 122 of the reflective sheet 120 . The diameter of the light conversion patch disposed between the first through hole 121 and the second through hole 122 may be between about 1.0 mm and 2.0 mm, preferably about 1.5 mm.

Three light conversion conversion patches may be disposed between the second through hole 122 and the third through hole 123 of the reflective sheet 120 . The diameter of the light conversion patch disposed between the second through hole 122 and the third through hole 123 may be between about 0.8 mm and 1.5 mm, preferably about 1.3 mm.

Three light conversion patches may be disposed inside the third through hole 123 of the reflective sheet 120 . The diameter of the light conversion patch disposed inside the third through hole 123 may be between about 0.5 mm and 1.1 mm, and preferably about 0.9 mm.

As described above, in the left and right edge portions of the reflective sheet 120 , the first light conversion patches 210 , the second light conversion patches 220 , and/or the third light conversion patches 230 are provided. can be placed.

The size of each of the first light conversion patches 210 disposed at the outermost portion of the left and right edge portions of the reflective sheet 120 is greater than the size of the second light conversion patches 220 disposed inside the first light conversion patches 210 . ) larger than each size. The distance between the first light conversion patches 210 is shorter than the distance between the second light conversion patches 220 . Also, the number of the first light conversion patches 210 is greater than the number of the second light conversion patches 220 .

The size of each of the second light conversion patches 220 is greater than the size of each of the third light conversion patches 230 disposed inside the second light conversion patches 220 . The distance between the second light conversion patches 220 is shorter than the distance between the third light conversion patches 230 . Also, the number of the second light conversion patches 220 is greater than the number of the third light conversion patches 230 .

As such, as the distance from the left and right edges 120b of the reflective sheet 120 to the light conversion patch 200 increases, the size of the light conversion patch 200 decreases, the distance between the light conversion patches 200 increases, and the light conversion The number of patches 200 may be reduced. In addition, as the distance from the left and right edges 120b of the reflective sheet 120 to the light conversion patch 200 increases, the area ratio occupied by the light conversion patch 200 may decrease.

Thereby, while the light is reflected at the edge portion of the reflective sheet 120 , the proportion of blue light included in the light may decrease and the proportion of yellow light may further increase. It may be compensated that the amount of light L5 passing through the light conversion sheet is smaller in the edge portion of the light source device 100 than in the center portion of the light source device 100 . In addition, an edge portion of the light source device 100 may be more bluish than a central portion of the light source device 100 , ie, an optical defect may be resolved.

11 illustrates an example of arrangement of a light conversion patch at a corner portion of a light source device according to an embodiment.

Although FIG. 10 described above shows the arrangement of the light conversion patch 200 at the left and right edge portions of the light source device 100 , the light conversion patch 200 may also be disposed on the upper and lower edges of the light source device 100 . . Also, the light change patch 200 may be disposed at a corner portion of the light source device 100 .

11 , a plurality of through holes 120a are formed in the reflective sheet 120 . In addition, the light conversion patch 200 may be applied, printed, or coated on left and right edge portions, upper and lower edge portions, and corner portions of the reflective sheet 120 . The light conversion patch 200 may be the same as the light conversion patch 200 described in FIG. 10 .

The light conversion patch 200 includes the first light conversion patches 210 disposed around the first through hole 121 of the left and right edge portions of the reflective sheet 120 and the second light conversion patch 210 disposed around the second through hole 122 . It may include two light conversion patches 220 or third light conversion patches 230 disposed around the third through hole 123 .

The description of the first light conversion patches 210 , the second light conversion patches 220 , and the third light conversion patches 230 is the first light conversion patches 210 , the second light conversion patches 210 described in conjunction with FIG. 10 . The description of the light conversion patches 220 and the third light conversion patches 230 will be replaced.

The light conversion patch 200 also includes a plurality of fourth light conversion patches 240 disposed around the fourth through hole 124 disposed in the first row in the upper and lower edges 120c of the reflective sheet 120 . may include For example, eight fourth light conversion patches 240 may be disposed around the fourth through hole 124 . Each of the eight fourth light conversion patches 240 may have a diameter of approximately 1.1 mm to 2.1 mm. The diameter of each of the fourth light conversion patches 240 may preferably be approximately 1.6 mm, and may have an error of 20%.

The plurality of fourth light conversion patches 240 may be disposed at approximately equal intervals along an arc of an imaginary circle surrounding the fourth through hole 124 . Also, the plurality of fourth light conversion patches 240 may be disposed at approximately equal angular intervals with respect to an imaginary central point inside the fourth through hole 124 . For example, the eight fourth light conversion patches 240 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the fourth through hole 124 .

The light conversion patch 200 includes a plurality of fifth light conversion patches 250 disposed around the fifth through hole 125 disposed in the second row in the upper and lower edges 120c of the reflective sheet 120 . may include For example, four fifth light conversion patches 250 may be disposed around the fifth through hole 125 . Each of the four fifth light conversion patches 250 may have a diameter of approximately 0.9 mm to 1.6 mm. The diameter of each of the fifth light conversion patches 250 may be preferably approximately 1.4 mm, and there may be an error of 20%.

The plurality of fifth light conversion patches 250 may be disposed at approximately equal intervals along an arc of an imaginary circle surrounding the fifth through hole 125 . Also, the plurality of fifth light conversion patches 250 may be disposed at approximately equal angular intervals with respect to an imaginary central point inside the fifth through hole 125 . For example, the four fifth light conversion patches 250 may be disposed at an angular interval of approximately 90 degrees with respect to an imaginary central point inside the fifth through hole 125 .

The light conversion patch 200 may include a plurality of sixth light conversion patches 260 disposed around the sixth through hole 126 disposed in the third row of the upper and lower edge portions of the reflective sheet 120 . have. For example, three sixth light conversion patches 260 may be disposed around the sixth through hole 126 . Each of the three sixth light conversion patches 260 may have a diameter of approximately 0.7 mm to 1.4 mm. The diameter of each of the sixth light conversion patches 260 may be preferably about 1.2 mm, and there may be an error of 20%.

The plurality of sixth light conversion patches 260 may be disposed along an arc of a virtual circle surrounding the sixth through hole 126 . For example, the three sixth light conversion patches 260 may be disposed at an angular interval of approximately 45 degrees or approximately 90 degrees with respect to an imaginary central point inside the sixth through hole 126 .

In addition, a seventh through hole 127 is disposed at a corner portion of the reflective sheet 120 , and the seventh through hole 127 is disposed closest to a corner of the reflective sheet 120 . Again, the distance between the corner of the reflective sheet 120 and the seventh through hole 127 may be the smallest of the distances between the corner of the reflective sheet 120 and the through hole. A plurality of seventh light conversion patches 270 may be disposed around the seventh through hole 127 . For example, eight seventh light conversion patches 270 may be disposed around the seventh through hole 127 . Each of the eight seventh light conversion patches 270 may have a diameter of approximately 1.5 mm to 2.5 mm. The diameter of each of the seventh light conversion patches 270 may preferably be approximately 2.0 mm, and there may be an error of 20%.

The plurality of seventh light conversion patches 270 may be disposed at approximately equal intervals along an arc of an imaginary circle surrounding the seventh through hole 127 . Also, the plurality of seventh light conversion patches 270 may be disposed at approximately equal angular intervals with respect to an imaginary central point inside the seventh through hole 127 . For example, the eight seventh light conversion patches 270 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the fourth through hole 124 .

As described above, in the upper and lower edge portions of the reflective sheet 120 , the fourth light conversion patches 240 , the fifth light conversion patches 250 , and/or the sixth light conversion patches 260 are provided. can be placed.

The size of each of the fourth light conversion patches 240 disposed at the outermost portion of the upper and lower edge portions of the reflective sheet 120 is the fifth and sixth light conversion patches disposed on the inner side of the fourth light conversion patches 240 . It is larger than the size of each of the (250, 260). The distance between the fourth light conversion patches 240 is shorter than the distance between the fifth and sixth light conversion patches 250 and 260 . Also, the number of the fourth light conversion patches 240 is greater than the number of the fifth and sixth light conversion patches 250 and 260 .

As such, as the distance from the upper and lower edges 120c of the reflective sheet 120 to the light conversion patch 200 increases, the size of the light conversion patch 200 decreases and the distance between the light conversion patches 200 increases, and the light conversion patch 200 increases. The number of conversion patches 200 may be reduced. In addition, the ratio of the area occupied by the light conversion patch 200 may decrease as the inner side of the upper and lower edge portions of the reflective sheet 120 increases.

The size of the light conversion patches 240 , 250 , 260 disposed on the upper and lower edge portions of the reflective sheet 120 is the size of the light conversion patches 210 , 220 , 230 disposed on the left and right edge portions of the reflective sheet 120 . may be different in size. For example, the diameter of each of the fourth light conversion patches 240 disposed at the outermost portion of the upper and lower edge portions of the reflective sheet 120 is the first light disposed at the outermost portion of the left and right edge portions of the reflective sheet 120 . It may be larger than the diameter of each of the conversion patches 210 . In addition, the diameter of each of the fifth and sixth light conversion patches 250 and 260 disposed inside the outermost of the upper and lower edge portions of the reflective sheet 120 is also the outermost of the left and right edge portions of the reflective sheet 120 . A diameter of each of the second and third light conversion patches 220 and 230 disposed inside may be larger.

Seventh light conversion patches 270 may be disposed at a corner portion of the reflective sheet 120 .

The size of the seventh light conversion patches 270 disposed in the corner portion of the reflective sheet 120 is the light conversion patches 210, 220, 230, 240, 250 and 260). For example, the diameter of the seventh light conversion patches 270 is greater than the diameter of the first and fourth light conversion patches 210 and 240 disposed at the outermost portions of the left/right/upper and lower edge portions of the reflective sheet 120 . can be large

Thereby, while the light is reflected at the corner portion of the reflective sheet 120 , the ratio of the blue light included in the light may decrease and the ratio of the yellow light may further increase. It may be supplemented that the amount of light L5 passing through the light conversion sheet is smaller at the corner portion of the light source device 100 than at the center portion of the light source device 100 . Also, a corner portion of the light source device 100 may be more bluish than a central portion of the light source device 100 , ie, an optical defect may be resolved.

In the above, the size of the light conversion patches disposed on the outermost side of the left/right/upper and lower edge portions of the reflective sheet 120 is different from the size of the light conversion patches disposed on the outermost inner side, and the left/right/lower edge of the reflective sheet 120 is It has been described that the distance between the outermost light conversion patches of the upper and lower edge portions is different from the distance between the outermost inner light conversion patches. However, the arrangement of the light conversion patches is not limited to the above description.

12 illustrates an example of a light conversion patch disposed on left and right edge portions of a light source device according to an embodiment.

As shown in FIG. 12 , the light conversion patch 200 may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 . The light conversion patch 200 may be the same as the light conversion patch described with reference to FIG. 10 .

The light conversion patch 200 includes a plurality of first light conversion patches 210 disposed around the first through hole 121 disposed in the first row in the left and right edges 120b of the reflective sheet 120 . can do. The size, arrangement, and number of the first light conversion patches 210 may be the same as those of the first light conversion patches 210 illustrated in FIG. 10 . For example, the eight first light conversion patches 210 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the first through hole 121 .

The light conversion patch 200 includes a plurality of second light conversion patches 220 disposed around the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . can do.

Unlike the second light conversion patches 220 illustrated in FIG. 10 , the size of the second light conversion patches 220 illustrated in FIG. 12 may be approximately the same as the size of the first light conversion patches 210 . have. In other words, the diameter of the second light conversion patches 220 may be approximately the same as the diameter of the first light conversion patches 210 . For example, if the diameter of the first light conversion patches 210 is approximately 1.5 mm, the diameter of the second light conversion patches 220 may also be approximately 1.5 mm.

The plurality of second light conversion patches 220 may be disposed at approximately equal intervals along an arc of a virtual circle surrounding the second through hole 122 , and the number of the second light conversion patches 220 is It may be the same as the number of the first light conversion patches 210 . For example, the eight second light conversion patches 220 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the second through hole 122 .

The light conversion patch 200 includes a plurality of third light conversion patches 230 disposed around the third through hole 123 disposed in the third row in the left and right edges 120b of the reflective sheet 120 . can do.

Unlike the third light conversion patches 230 illustrated in FIG. 10 , the size of the third light conversion patches 230 illustrated in FIG. 12 may be approximately the same as the size of the first light conversion patches 210 . have. In other words, the diameter of the third light conversion patches 230 may be approximately the same as the diameter of the first light conversion patches 210 . For example, if the diameter of the first light conversion patches 210 is approximately 1.5 mm, the diameter of the third light conversion patches 230 may also be approximately 1.5 mm.

The plurality of third light conversion patches 230 may be disposed at approximately equal intervals along an arc of an imaginary circle surrounding the third through hole 123 , and the number of third light conversion patches 230 is It may be the same as the number of the first light conversion patches 210 . For example, the eight third light conversion patches 230 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the third through hole 123 .

Although not shown in FIG. 12 , the light conversion patch 200 includes a plurality of fourth light conversion patches disposed around the fourth through hole disposed in the first row in the upper and lower edges 120c of the reflective sheet 120 . , a plurality of fifth light conversion patches disposed around the fifth through hole disposed in the second row or a plurality of fourth light conversion patches disposed around the fourth through hole disposed in the third row. .

The size of the fourth, fifth, and sixth light conversion patches may be the same as the size of the first light conversion patches 210 , and the number of the fourth, fifth, and sixth light conversion patches is the same as the size of the first light conversion patch. It may be the same as the number of s 210 .

The light conversion patch 200 may include a plurality of seventh light conversion patches disposed around a seventh through hole disposed at a corner portion of the reflective sheet, and the size, number, and arrangement of the seventh light conversion patches may be 1 may be the same as the size, number, and arrangement of the light conversion patches 210 .

In addition, unlike shown in FIG. 12 , the second light conversion patches 220 are omitted, or the third light conversion patches 230 are omitted, or the second and third light conversion patches 220 and 230 are omitted. This may be omitted. In other words, the light conversion patch 200 includes only the first light conversion patches 210 , or includes the first and second light conversion patches 210 and 220 , or the first and third light conversion patches 210 . It may include patches 210 and 230 .

13 illustrates an example of a light conversion patch disposed on left and right edge portions of a light source device according to an embodiment.

As shown in FIG. 13 , the light conversion patch 200 may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 . The light conversion patch 200 may be the same as the light conversion patch described with reference to FIG. 10 .

The light conversion patch 200 includes a plurality of first light conversion patches 210 disposed around the first through hole 121 disposed in the first row in the left and right edges 120b of the reflective sheet 120 . can do. The size, arrangement, and number of the first light conversion patches 210 may be the same as those of the first light conversion patches 210 illustrated in FIG. 10 . For example, the eight first light conversion patches 210 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the first through hole 121 .

The light conversion patch 200 includes a plurality of second light conversion patches 220 disposed around the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . can do.

Unlike the second light conversion patches 220 illustrated in FIG. 10 , the size of the second light conversion patches 220 illustrated in FIG. 13 may be approximately the same as the size of the first light conversion patches 210 . have. For example, if the diameter of the first light conversion patches 210 is approximately 1.5 mm, the diameter of the second light conversion patches 220 may also be approximately 1.5 mm.

The number of the second light conversion patches 220 may be smaller than the number of the first light conversion patches 210 , and the plurality of second light conversion patches 220 may be formed to surround the second through hole 122 . They may be arranged at approximately equal intervals along the arc of the virtual circle. For example, the four second light conversion patches 220 may be disposed at an angular interval of approximately 90 degrees with respect to an imaginary central point inside the second through hole 122 .

The light conversion patch 200 includes a plurality of third light conversion patches 230 disposed around the third through hole 123 disposed in the third row in the left and right edges 120b of the reflective sheet 120 . can do.

Unlike the second light conversion patches 220 illustrated in FIG. 10 , the size of the third light conversion patches 230 illustrated in FIG. 13 may be approximately the same as the size of the first light conversion patches 210 . have. For example, if the diameter of the first light conversion patches 210 is approximately 1.5 mm, the diameter of the third light conversion patches 230 may also be approximately 1.5 mm.

The number of the third light conversion patches 230 may be smaller than the number of the second light conversion patches 220 , and the plurality of third light conversion patches 230 are formed to surround the third through hole 123 . It may be arranged along the arc of the virtual circle. For example, the three third light conversion patches 230 may be disposed at an angular interval of approximately 90 degrees or approximately 180 degrees with respect to an imaginary central point inside the third through hole 123 .

Although not shown in FIG. 13 , the light conversion patch 200 may include a plurality of fourth light conversion patches, a plurality of fifth light conversion patches, or a plurality of sixth light conversion patches.

The size of the fourth, fifth, and sixth light conversion patches may be the same as the size of the first light conversion patches 210 .

The number and arrangement of the fourth light conversion patches are the same as the number and arrangement of the first light conversion patches 210 , and the number and arrangement of the fifth light conversion patches is the number and arrangement of the second light conversion patches 220 . and the number and arrangement of the sixth light conversion patches may be the same as the number and arrangement of the fifth light conversion patches 250 .

The light conversion patch 200 may include a plurality of seventh light conversion patches disposed around a seventh through hole disposed at a corner portion of the reflective sheet, and the size, number, and arrangement of the seventh light conversion patches may be 1 may be the same as the size, number, and arrangement of the light conversion patches 210 .

14 illustrates an example of a light conversion patch disposed on left and right edge portions of a light source device according to an exemplary embodiment.

As shown in FIG. 14 , the light conversion patch 200 may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 . The light conversion patch 200 may be the same as the light conversion patch described with reference to FIG. 10 .

The light conversion patch 200 includes a plurality of first light conversion patches 210 disposed around the first through hole 121 disposed in the first row in the left and right edges 120b of the reflective sheet 120 . can do. The size, arrangement, and number of the first light conversion patches 210 may be the same as those of the first light conversion patches 210 illustrated in FIG. 10 . For example, the eight first light conversion patches 210 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the first through hole 121 .

The light conversion patch 200 includes a plurality of second light conversion patches 220 disposed around the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . can do.

The size of the second light conversion patches 220 may be smaller than the size of the first light conversion patches 210 . For example, if the diameter of the first light conversion patches 210 is approximately 1.5 mm, the diameter of the second light conversion patches 220 may be approximately 1.3 mm.

Unlike the second light conversion patches 220 illustrated in FIG. 10 , the number of the second light conversion patches 220 illustrated in FIG. 14 may be the same as the number of the first light conversion patches 210 . , the plurality of second light conversion patches 220 may be disposed at approximately equal intervals along an arc of a virtual circle surrounding the second through hole 122 . For example, the eight second light conversion patches 220 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the second through hole 122 .

The light conversion patch 200 includes a plurality of third light conversion patches 230 disposed around the third through hole 123 disposed in the third row in the left and right edges 120b of the reflective sheet 120 . can do.

The size of the third light conversion patches 230 may be smaller than the size of the second light conversion patches 220 . For example, if the diameter of the second light conversion patches 220 is approximately 1.3 mm, the diameter of the second light conversion patches 220 may be approximately 1.1 mm.

Unlike the third light conversion patches 230 illustrated in FIG. 10 , the number of the third light conversion patches 230 illustrated in FIG. 14 is the number of the first and second light conversion patches 210 and 220 . may be the same as , and the plurality of third light conversion patches 230 may be disposed at approximately equal intervals along an arc of a virtual circle surrounding the third through hole 123 . For example, the eight third light conversion patches 230 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the third through hole 123 .

Although not shown in FIG. 14 , the light conversion patch 200 may include a plurality of fourth light conversion patches, a plurality of fifth light conversion patches, or a plurality of sixth light conversion patches.

The size of the fourth light conversion patches is the same as that of the first light conversion patches 210 , the size of the fifth light conversion patches is the same as the size of the second light conversion patches 220 , and the size of the sixth light conversion patches is the same as that of the second light conversion patches 220 . The size of the patches may be the same as the size of the fifth light conversion patches 250 .

The number and arrangement of the fourth, fifth, and sixth light conversion patches may be the same as the number and arrangement of the first light conversion patches 210 .

The light conversion patch 200 may include a plurality of seventh light conversion patches disposed around a seventh through hole disposed at a corner portion of the reflective sheet, and the size, number, and arrangement of the seventh light conversion patches may be 1 may be the same as the size, number, and arrangement of the light conversion patches 210 .

15 illustrates an example of a light conversion patch disposed on left and right edge portions of a light source device according to an embodiment.

As shown in FIG. 15 , the light conversion patch 200 may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 .

The light conversion patch 200 may include a light conversion material that absorbs a portion of blue light among incident light and converts a portion of the absorbed blue light into yellow light, red light, or green light. In addition, the light conversion patch 200 may include a light conversion material that absorbs a portion of blue light among the incident light and reflects yellow light, red light, or green light.

The light conversion patch 200 may have a substantially rectangular shape. However, the shape of the light conversion patch 200 is not limited to a quadrangle, and may be a polygon including a triangle, a pentagon, and a hexagon.

The light conversion patch 200 includes a plurality of first light conversion patches 210 disposed around the first through hole 121 disposed in the first row in the left and right edges 120b of the reflective sheet 120 . can do. The arrangement and number of the first light conversion patches 210 may be the same as those of the first light conversion patches 210 illustrated in FIG. 10 . For example, the eight first light conversion patches 210 may be disposed at approximately 45 degree angular intervals with respect to an imaginary central point inside the first through hole 121 .

Each of the first light conversion patches 210 may be a square having a side of approximately 1.5 mm.

The light conversion patch 200 includes a plurality of second light conversion patches 220 disposed around the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . can do.

The size of the second light conversion patches 220 may be smaller than the size of the first light conversion patches 210 . For example, one side of the second light conversion patches 220 may have a square shape of approximately 1.3 mm.

The number of the second light conversion patches 220 may be smaller than the number of the first light conversion patches 210 , and the plurality of second light conversion patches 220 may be formed to surround the second through hole 122 . They may be arranged at approximately equal intervals along the arc of the virtual circle. For example, the four second light conversion patches 220 may be disposed at an angular interval of approximately 90 degrees with respect to an imaginary central point inside the second through hole 122 .

The light conversion patch 200 includes a plurality of third light conversion patches 230 disposed around the third through hole 123 disposed in the third row in the left and right edges 120b of the reflective sheet 120 . can do.

The size of the third light conversion patches 230 may be smaller than the size of the second light conversion patches 220 . For example, one side of the third light conversion patches 230 may have a square shape of about 1.1 mm.

The number of the third light conversion patches 230 may be smaller than the number of the second light conversion patches 220 , and the plurality of second light conversion patches 220 may be formed to surround the second through hole 122 . It may be arranged along the arc of the virtual circle. For example, the three third light conversion patches 230 may be disposed at an angular interval of approximately 90 degrees or approximately 180 degrees with respect to an imaginary central point inside the third through hole 123 .

Although not shown in FIG. 13 , the light conversion patch 200 may include a plurality of fourth light conversion patches, a plurality of fifth light conversion patches, or a plurality of sixth light conversion patches. Each of the fourth, fifth, and sixth light conversion patches may be a polygon including a square, a triangle, a pentagon, or a hexagon.

The size, number, and arrangement of the fourth light conversion patches are the same as the size, number, and arrangement of the first light conversion patches 210 , and the size, number and arrangement of the fifth light conversion patches are the same as the size, number and arrangement of the second light conversion patches ( 220 , and the number and arrangement of the sixth light conversion patches may be the same as the size, number, and arrangement of the fifth light conversion patches 250 .

The light conversion patch 200 may include a plurality of seventh light conversion patches disposed around a seventh through hole disposed at a corner portion of the reflective sheet, and the size, number and arrangement of the seventh light conversion patches may be 1 may be the same as the size, number, and arrangement of the light conversion patches 210 .

16 illustrates an example of a light conversion band disposed on left and right edge portions of a light source device according to an embodiment.

As shown in FIG. 16 , the light conversion patch 200 may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 .

The light conversion patch 200 may include a light conversion material that absorbs a portion of blue light among incident light and converts a portion of the absorbed blue light into yellow light, red light, or green light. In addition, the light conversion patch 200 may include a light conversion material that absorbs a portion of blue light among the incident light and reflects yellow light, red light, or green light.

The light conversion patch 200 may have a substantially ring shape surrounding the through holes 120a. Although the optical conversion patch 200 having a substantially ring shape is illustrated in FIG. 16 , the present invention is not limited thereto. For example, the light conversion patch 200 may have various ring shapes such as an elliptical ring, a square ring, a pentagonal ring, a hexagonal ring, etc. surrounding the through holes.

The light conversion patch 200 may include first light conversion bands 310 surrounding the first through hole 121 disposed in the first row in the left and right edges 120b of the reflective sheet 120 . For example, the first light conversion bands 310 may have a ring shape having a width of approximately 1.5 mm.

The light conversion patch 200 may include second light conversion bands 320 surrounding the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . The shape, size, and number of the second light conversion bands 320 may be the same as the shape, size, and number of the first light conversion bands 310 . For example, the second light conversion bands 320 may have a ring shape having a width of approximately 1.5 mm.

The light conversion patch 200 may include third light conversion bands 330 surrounding the third through hole 123 disposed in the third row in the left and right edges 120b of the reflective sheet 120 . The shape, size, and number of the third light conversion bands 330 may be the same as the shape, size, and number of the first light conversion bands 310 . For example, the third light conversion bands 330 may have a ring shape having a width of approximately 1.5 mm.

Although not shown in FIG. 16 , the light conversion patch 200 includes a plurality of fourth light conversion bands surrounding the fourth through hole, a plurality of fifth light conversion bands surrounding the fifth through hole, and a sixth It may further include a plurality of sixth light conversion bands surrounding the through hole or a plurality of seventh light conversion bands surrounding the seventh through hole.

In addition, unlike shown in FIG. 16 , the second light conversion bands 320 are omitted, or the third light conversion bands 330 are omitted, or the second and third light conversion bands 320 and 330 are omitted. This may be omitted. In other words, the light conversion patch 200 includes only the first light conversion bands 310 , or includes the first and second light conversion bands 310 and 320 , or the first and third light conversion bands. Bands 310 and 330 may be included.

The ratio of blue light included in the light may decrease and the ratio of yellow light may further increase while light is reflected from the edge part of the reflective sheet 120 by the light conversion bands disposed on the edge portion of the reflective sheet 120 . . In addition, an edge portion of the light source device 100 may be more bluish than a central portion of the light source device 100 , ie, an optical defect may be resolved.

17 illustrates an example of a light conversion band disposed on left and right edge portions of a light source device according to an exemplary embodiment.

As shown in FIG. 17 , a light conversion patch 200 including a light conversion material may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 .

The light conversion patch 200 may include first light conversion bands 310 surrounding the first through hole 121 disposed in the first row in the left and right edges 120b of the reflective sheet 120 . The first light conversion bands 310 may have a ring shape having a width of approximately 1.5 mm.

The light conversion patch 200 may include second light conversion bands 320 surrounding the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . The size of the second light conversion bands 320 may be smaller than the size of the first light conversion bands 310 . For example, the second light conversion bands 320 may have a ring shape having a width of approximately 1.3 mm.

The light conversion patch 200 may include third light conversion bands 330 surrounding the third through hole 123 disposed in the third row in the left and right edges 120b of the reflective sheet 120 . The size of the third light conversion bands 330 may be smaller than the size of the second light conversion bands 320 . For example, the third light conversion bands 330 may have a ring shape having a width of approximately 1.1 mm.

As described above, in the left and right edge portions of the reflective sheet 120 , the first light conversion bands 310 , the second light conversion bands 320 , and/or the third light conversion bands 330 are can be placed. The width of the first light conversion bands 310 may be greater than the width of the second light conversion bands 320 , and the width of the second light conversion bands 320 is the width of the third light conversion bands 330 . It can be larger than the width.

Although not shown in FIG. 16 , the light conversion patch 200 includes a plurality of fourth light conversion bands surrounding the fourth through hole 124 and a plurality of fifth light conversion bands surrounding the fifth through hole. , may further include a plurality of sixth light conversion bands surrounding the sixth through hole or a plurality of seventh light conversion bands surrounding the seventh through hole disposed at a corner of the reflective sheet 120 . The fourth light conversion bands are equal to the first light conversion bands 310 , the fifth light conversion bands are equal to the second light conversion bands 310 , and the sixth light conversion bands are the third light conversion bands Same as 310 , and the seventh light conversion bands may be the same as the first light conversion bands 310 .

As such, as the distance from the left and right edges 120b of the reflective sheet 120 to the light conversion patch 200 increases, the size (width) of the light conversion patch 200 may decrease.

18 illustrates an example of a light conversion line disposed on left and right edge portions of a light source device according to an exemplary embodiment.

18 , a light conversion patch 200 including a light conversion material may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 .

The light conversion patch 200 may have a substantially plurality of circumference shapes surrounding the through holes 120a. Although the light conversion patch 200 having a substantially circular shape is illustrated in FIG. 18 , the present invention is not limited thereto. For example, the light conversion patch 200 may have various circumferential shapes such as an oval perimeter, a square perimeter, a pentagonal perimeter, and a hexagonal perimeter surrounding the through holes.

The light conversion patch 200 may include first light conversion lines 410 surrounding the first through hole 121 disposed in the first column in the left and right edges 120b of the reflective sheet 120 . For example, the first light conversion lines 410 may include three circles surrounding the first through hole 121 .

The light conversion patch 200 may include second light conversion lines 420 surrounding the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . The shape, size, and number of the second light conversion lines 420 may be the same as the shape, size, and number of the first light conversion lines 410 . For example, the second light conversion lines 420 may include three circles surrounding the second through hole 122 .

The light conversion patch 200 may include third light conversion lines 430 surrounding the third through hole 122 disposed in the third row in the left and right edges 120b of the reflective sheet 120 . The shape, size, and number of the third light conversion lines 430 may be the same as the shape, size, and number of the first light conversion lines 410 . For example, the third light conversion lines 430 may include three circles surrounding the third through hole 123 .

Although not shown in FIG. 18 , the light conversion patch 200 includes a plurality of fourth light conversion lines surrounding the fourth through hole, a plurality of fifth light conversion lines surrounding the fifth through hole, and a sixth It may further include a plurality of sixth light conversion lines surrounding the through hole or a plurality of seventh light conversion lines surrounding the seventh through hole.

Also, unlike shown in FIG. 18 , the second light conversion lines 420 are omitted, or the third light conversion lines 430 are omitted, or the second and third light conversion lines 420 and 430 are omitted. This may be omitted. In other words, the light conversion patch 200 includes only the first light conversion lines 410 , or includes the first and second light conversion lines 410 and 420 , or the first and third light conversion lines 410 , 420 . It may include lines 410 and 430 .

The ratio of blue light included in the light may decrease and the ratio of yellow light may further increase while light is reflected from the edge part of the reflective sheet 120 by the light conversion lines disposed on the edge portion of the reflective sheet 120 . . In addition, an edge portion of the light source device 100 may be more bluish than a central portion of the light source device 100 , ie, an optical defect may be resolved.

19 illustrates an example of a light conversion line disposed on left and right edge portions of a light source device according to an exemplary embodiment.

As shown in FIG. 19 , a light conversion patch 200 including a light conversion material may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 .

The light conversion patch 200 may include first light conversion lines 410 surrounding the first through hole 121 disposed in the first column in the left and right edges 120b of the reflective sheet 120 . For example, the first light conversion lines 410 may include three circles surrounding the first through hole 121 .

The light conversion patch 200 may include second light conversion lines 420 surrounding the second through hole 122 disposed in the second row in the left and right edges 120b of the reflective sheet 120 . The number of the second light conversion lines 420 may be smaller than the number of the first light conversion lines 410 . For example, the second light conversion lines 420 may include two circumferences surrounding the second through hole 122 .

The light conversion patch 200 may include third light conversion lines 430 surrounding the third through hole 122 disposed in the third row in the left and right edges 120b of the reflective sheet 120 . The number of the third light conversion lines 430 may be smaller than the number of the second light conversion lines 420 . For example, the third light conversion lines 430 may include one circumference surrounding the third through hole 123 .

20 illustrates an example of a light conversion region disposed on left and right edge portions of a light source device according to an exemplary embodiment.

As shown in FIG. 20 , a light conversion patch 200 including a light conversion material may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 .

The light conversion patch 200 may include a light conversion region 410 in which a light conversion material surrounding the through holes 120a is dispersed. For example, a light conversion region 410 in which dots including a light conversion material are distributed may be disposed around the through holes 120a.

The light conversion region 410 is in the periphery of the first through hole 121 disposed in the first row in the left and right edges 120b of the reflective sheet 120, and in the second row in the left and right edges 120b of the reflective sheet 120 It may be disposed from the periphery of the disposed second through hole 122 and the left and right edges 120b of the reflective sheet 120 to the periphery of the third through hole 123 disposed in the third row.

In the light conversion region 410 , the density of dots including the light conversion material may be constant.

21 illustrates an example of a light conversion region disposed on left and right edge portions of a light source device according to an exemplary embodiment.

As shown in FIG. 21 , a light conversion patch 200 including a light conversion material may be disposed around the through holes 120a in the edge portion of the reflective sheet 120 .

The light conversion patch 200 may include a light conversion region 420 in which a light conversion material surrounding the through holes 120a is dispersed. For example, a light conversion region 420 in which dots including a light conversion material are distributed may be disposed around the through holes 120a.

The light conversion region 410 may be disposed around the first through hole 121 , the second through hole 122 , and the third through hole 123 .

In the light conversion region 410 , the density of dots including the light conversion material may vary according to a distance from the left and right edges 120b of the reflective sheet 120 . For example, as the distance from the left and right edges 120b of the reflective sheet 120 increases, the density of dots including the light conversion material may decrease.

In the above, it has been described that the light conversion patch 200 is applied or printed or coated on the edge portion of the “reflective sheet 120”. However, the light conversion patch 200 may be applied, printed, or coated on other sheets or plates as well as the “reflective sheet 120”.

22 illustrates a light conversion patch disposed on an edge portion of a light source device according to an exemplary embodiment.

For example, the light conversion patch 200 may be applied, printed, or coated on an edge portion of the substrate 112 . As shown in FIG. 22 , the light conversion patch 200 may include a plurality of light conversion patches disposed at approximately equal intervals along the circumference of a substantially circle surrounding the light source 111 .

The light conversion patches surrounding the light source 111 may be exposed through the through hole 120a of the reflective sheet 120 . Accordingly, the light emitted from the light source 111 may be reflected by the light conversion patch 200 coated or printed or coated on the substrate 112 .

The arrangement of the light conversion patch 200 is not limited to FIG. 22 , and the light conversion patch 200 may be disposed along the circumference of the light source 111 on the substrate 112 as shown in FIGS. 10 to 21 . have.

In addition, the light conversion patch 200 is not limited to being disposed on the reflective sheet 120 or the substrate 112 , and the light conversion patch 200 includes the diffusion plate 130 , the diffusion sheet 142 , and the prism sheet 143 . ), the light conversion sheet 141 or the edge portion of the reflective polarizing sheet 144 may be applied or printed or coated.

A display device according to an embodiment includes a liquid crystal panel; and a light source device irradiating light to the liquid crystal panel. The light source device may include a plurality of light sources emitting blue light; and a reflective sheet having a plurality of holes through which the plurality of light sources pass, respectively, wherein a distance between the first hole disposed at an edge portion of the reflective sheet and an edge of the reflective sheet is equal to the plurality of holes. A second hole greater than a distance between the edge of the reflective sheet and the first hole may be included. The light source device may include a plurality of first light conversion patches disposed on the reflective sheet along a circumference of a circle surrounding the first hole, and disposed on the reflection sheet along a circumference of a circle surrounding the second hole and a plurality of second light conversion patches that become Each of the conversion patches may include at least one of a yellow fluorescent material, a yellow dye, or a yellow pigment.

Thereby, the proportion of blue light may decrease and the proportion of yellow light may further increase at the edge portion of the light source device. In addition, the edge portion of the light source device is more bluish than the central portion of the light source device, that is, the optical defect can be eliminated.

The number of the plurality of first light conversion patches surrounding any one of the plurality of first holes is the number of the plurality of second light conversion patches surrounding any one of the second holes among the plurality of second holes. It may be greater than the number of patches. An angular distance between the plurality of first light conversion patches surrounding any one of the plurality of first holes is an angular distance between the plurality of first light conversion patches surrounding any one of the plurality of second holes. It may be smaller than the angular spacing between the two light conversion patches.

Thereby, at the edge portion of the light source device, the proportion of blue light can be decreased stepwise and the ratio of yellow light can be increased stepwise. Also, the uniformity of color between the edge portion of the light source device and the central portion of the light source device can be maintained.

The number of the plurality of first light conversion patches surrounding any one of the plurality of first holes is the number of the plurality of second light conversion patches surrounding any one of the second holes among the plurality of second holes. It may be equal to the number of patches. An angular distance between the plurality of first light conversion patches surrounding any one of the plurality of first holes is an angular distance between the plurality of first light conversion patches surrounding any one of the plurality of second holes. It may be equal to the angular spacing between the two light conversion patches.

Thereby, the optical defect that the edge portion of the light source device is bluish than the central portion of the light source device can be resolved using a simple structure.

A diameter of each of the plurality of light sources may be between approximately 2.0 millimeters and 3.0 millimeters.

A diameter of each of the plurality of holes may be between approximately 3.5 millimeters and 5.5 millimeters.

The distance between the plurality of holes may be between approximately 8.5 millimeters and 13.5 millimeters.

Each of the plurality of first light conversion patches may be circular or polygonal, and a diameter of each of the plurality of first light conversion patches may be between approximately 1.0 millimeter and 2.0 millimeters.

The plurality of first light conversion patches may include eight light conversion patches surrounding any one of the plurality of first holes.

Each of the plurality of second light conversion patches may be circular or polygonal, and each of the plurality of second light conversion patches may have a diameter of approximately 0.8 millimeters to 1.5 millimeters.

The plurality of second light conversion patches may include four light conversion patches surrounding any one of the plurality of second holes.

The plurality of holes may include a third hole having a minimum distance from a corner of the reflective sheet. The light source device further includes a plurality of third light conversion patches disposed on the reflective sheet along a circumference of a circle surrounding the plurality of third holes, and the size of each of the plurality of third light conversion patches is A size of each of the plurality of second light conversion patches may be larger.

Thereby, the proportion of blue light may decrease and the proportion of yellow light may further increase at the corner portion of the light source device. In addition, the corner portion of the light source device is more bluish than the central portion of the light source device, that is, the optical defect can be eliminated.

The plurality of third light conversion patches may be circular or polygonal, and a diameter of each of the plurality of third light conversion patches may be between approximately 1.5 millimeters and 2.5 millimeters.

The plurality of third light conversion patches may include eight light conversion patches surrounding any one of the plurality of third holes.

The plurality of first light conversion patches may include a plurality of different first rings surrounding the first hole, and the plurality of second light conversion patches may include a plurality of different second rings surrounding the first hole. may include The number of the first rings may be greater than the number of the second rings.

The plurality of first light conversion patches may include a first ring surrounding the first hole, and the plurality of second light conversion patches may include a second ring surrounding the first hole. A width of the first ring may be greater than a width of the second rings.

The light source device may further include a light conversion sheet that converts a part of the blue light included in the incident light into yellow light and passes the other part of the blue light.

Each of the plurality of first light conversion patches may convert a portion of the blue light included in the incident light into yellow light and pass another portion of the blue light through.

Each of the plurality of first light conversion patches may absorb a portion of the blue light included in the incident light and reflect the yellow light included in the incident light.

A display device according to an embodiment includes a liquid crystal panel; and a light source device irradiating light to the liquid crystal panel. The light source device may include a plurality of light sources emitting blue light; and a reflective sheet having a plurality of holes through which the plurality of light sources pass, respectively, wherein the plurality of holes are disposed at an edge of the reflective sheet rather than a first hole and the first hole disposed at an edge portion of the reflective sheet. It may include a second hole formed further away. The light source device includes first light conversion patches disposed around the first hole of the reflective sheet and second light conversion patches disposed around the second hole of the reflective sheet, wherein the first light conversion An areal density of the patches may be greater than an areal density of the second light conversion patches.

The disclosed embodiments have been described with reference to the accompanying drawings as described above. Those of ordinary skill in the art to which the published embodiment pertains will understand that the disclosed embodiment may be implemented in a form different from the disclosed embodiment without changing the technical spirit or essential features of the published embodiment. The disclosed embodiments are illustrative and should not be construed as limiting.

1: display device 11: main body
12: screen 20: liquid crystal panel
30: panel driver 50: control assembly
60: power assembly 80: content receiving unit
81: receiving terminal 82: tuner
90: image processing unit 91: processor
92: memory 100: light source device
110: light source module 111: light source
112: substrate 120: reflective sheet
120a: through-holes 121: first through-hole
122: second through hole 123: third through hole
124: fourth through hole 125: fifth through hole
126: sixth through hole 127: seventh through hole
130: diffusion plate 140: optical sheet
141: light conversion sheet 142: diffusion sheet
143: prism sheet 144: reflective polarizing sheet
180: transparent dome 190: light emitting diode
200: light conversion patch 210: first light conversion patch
220: second light conversion patch 230: third light conversion patch
240: fourth light conversion patch 250: fifth light conversion patch
260: sixth light conversion patch 270: seventh light conversion patch
310: first light conversion band 320: second light conversion band
330: third light conversion band 410: first light conversion line
420: second light conversion line 430: third light conversion line

Claims (20)

liquid crystal panel; and
A light source device for irradiating light to the liquid crystal panel,
The light source device,
a plurality of light sources emitting blue light; and
and a reflective sheet having a plurality of holes through which the plurality of light sources pass, respectively.
The plurality of holes include a first hole disposed at an edge portion of the reflective sheet and a second hole in which a distance between the edge of the reflective sheet is greater than a distance between the edge of the reflective sheet and the first hole,
The light source device may include a plurality of first light conversion patches disposed on the reflective sheet along a circumference of a circle surrounding the first hole, and disposed on the reflection sheet along a circumference of a circle surrounding the second hole It further comprises a plurality of second light conversion patches,
A size of each of the plurality of first light conversion patches is greater than a size of each of the plurality of second light conversion patches,
Each of the plurality of first and second light conversion patches includes at least one of a yellow fluorescent material, a yellow dye, or a yellow pigment. According to claim 1,
The number of the plurality of first light conversion patches surrounding any one of the plurality of first holes is the number of the plurality of second light conversion patches surrounding any one of the second holes among the plurality of second holes. A display device greater than the number of patches. According to claim 1,
An angular distance between the plurality of first light conversion patches surrounding any one of the plurality of first holes is an angular distance between the plurality of first light conversion patches surrounding any one of the plurality of second holes. 2 A display device smaller than the angular spacing between the light conversion patches. According to claim 1,
The number of the plurality of first light conversion patches surrounding any one of the plurality of first holes is the number of the plurality of second light conversion patches surrounding any one of the second holes among the plurality of second holes. A display device equal to the number of patches. According to claim 1,
An angular distance between the plurality of first light conversion patches surrounding any one of the plurality of first holes is an angular distance between the plurality of first light conversion patches surrounding any one of the plurality of second holes. 2 A display device equal to the angular spacing between the light conversion patches. According to claim 1,
A diameter of each of the plurality of light sources is between 2.0 millimeters and 3.0 millimeters. According to claim 1,
and a diameter of each of the plurality of holes is between 3.5 millimeters and 5.5 millimeters. According to claim 1,
A distance between the plurality of holes is between 8.5 millimeters and 13.5 millimeters. According to claim 1,
Each of the plurality of first light conversion patches has a circular shape or a polygonal shape, and a diameter of each of the plurality of first light conversion patches is between 1.0 millimeter and 2.0 millimeters. According to claim 1,
The plurality of first light conversion patches includes eight light conversion patches surrounding any one of the plurality of first holes. According to claim 1,
each of the plurality of second light conversion patches is circular or polygonal, and the diameter of each of the plurality of second light conversion patches is between 0.8 millimeters and 1.5 millimeters. According to claim 1,
The plurality of second light conversion patches includes four light conversion patches surrounding any one of the plurality of second holes. According to claim 1,
The plurality of holes includes a third hole having a minimum distance from a corner of the reflective sheet,
The light source device further includes a plurality of third light conversion patches disposed on the reflective sheet along a circumference of a circle surrounding the plurality of third holes,
A size of each of the plurality of third light conversion patches is larger than a size of each of the plurality of first light conversion patches. 14. The method of claim 13,
The plurality of third light conversion patches are circular or polygonal, and a diameter of each of the plurality of third light conversion patches is between 1.5 millimeters and 2.5 millimeters. 15. The method of claim 14,
The plurality of third light conversion patches includes eight light conversion patches surrounding any one of the plurality of third holes. According to claim 1,
The plurality of first light conversion patches include a plurality of different first rings surrounding the first hole,
The plurality of second light conversion patches include a plurality of different second rings surrounding the first hole,
The number of the first rings is greater than the number of the second rings. According to claim 1,
The plurality of first light conversion patches include a first ring surrounding the first hole,
The plurality of second light conversion patches include a second ring surrounding the first hole,
A width of the first ring is greater than a width of the second rings. According to claim 1,
The light source device may further include a light conversion sheet that converts a part of the blue light included in the incident light into yellow light and passes the other part of the blue light. According to claim 1,
Each of the plurality of first light conversion patches converts a portion of the blue light included in the incident light into yellow light and transmits another portion of the blue light. According to claim 1,
Each of the plurality of first light conversion patches absorbs a portion of the blue light included in the incident light and reflects the yellow light included in the incident light.

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