TWI727535B - Backlight unit and display device including the same - Google Patents

Abstract

In an embodiment, a display device comprises a display panel and a backlight unit. The backlight unit comprises a substrate, a phosphor film, a plurality of light-emitting devices, and a light-modifying portion. A part of light emitted by the light-emitting devices traveling along a first path that passes through the phosphor film and another part of the emitted light traveling along a second path that bypasses the phosphor film. The light-modifying portion is in the second path and modifies a color of the other part of the emitted light so that the modified color is closer to a color of the part of the light through the phosphor film than a color of the emitted light at the light-emitting devices.

Description

Backlight unit and display device containing the backlight unit

The embodiment of the present invention relates to a backlight unit and a display device including the backlight unit.

With the development of society to an information society, the demand for display devices for displaying images is increasing, and various types of display devices such as liquid crystal display devices, organic light-emitting display devices, etc. are being used.

The display device includes a backlight unit, and can display an image corresponding to light emitted from the backlight unit. Such a display device uses a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), etc. as the light source of the backlight unit. In recent years, light emitting diodes with excellent light efficiency and high color reproducibility have been widely used as light sources of backlight units.

According to the arrangement of the light source and the light transmission form, the backlight unit can be divided into edge-type or direct-type. In the direct type backlight unit, a light source such as an LED may be provided on the rear side of the display device. The light source device used in such a direct type backlight unit may include a light-emitting diode and a substrate on which the light-emitting diode is mounted and circuit elements for driving the light-emitting diode and the like are included.

In recent years, there has been an increasing demand for light weight, low power consumption, and high optical efficiency of display devices used in smart phones, tablet computers, and the like.

Embodiments of the present invention provide a backlight unit capable of improving image quality, and a display device including the backlight unit.

Embodiments of the present invention provide a backlight unit with high optical efficiency, and a display device including the backlight unit.

According to the embodiments of the present invention, a backlight unit capable of improving image quality and a display device including the backlight unit can be provided.

In various embodiments, a display device includes a display panel; and a backlight unit. The backlight unit includes: a substrate; a phosphor film on the substrate; a plurality of light-emitting devices on the substrate and between the substrate and the phosphor film, the plurality of light-emitting devices emit light, the emitted light A part of the light travels along a first path through the phosphor film, and the other part of the emitted light travels along a second path bypassing the phosphor film; and a light modification part located at the second path Path, and change the color of the other part of the emitted light, so that compared with the color of the light emitted at the plurality of light-emitting devices, the changed color is closer to that of the light passing through the part of the phosphor film colour.

In one embodiment, the display device further includes: a bottom cover located under the backlight unit; and a guide panel located on the bottom cover, the display panel is mounted on the guide panel, and the guide panel is configured to reflect The other part of the emitted light traveling along the second path.

In one embodiment, the guide panel includes a surface facing the substrate, and the light modification part is in physical contact with the surface.

In one embodiment, the light modification part is located above the phosphor film.

In one embodiment, the light modification part is in physical contact with the bottom cover.

In an embodiment, the light modification part is in physical contact with the guide panel and the substrate.

In an embodiment, the light modification part is located between the substrate and the phosphor film.

In one embodiment, the light modification part is located on the same plane as the plurality of light-emitting devices.

In various embodiments, a display device includes a display panel; and a backlight unit. The backlight unit includes: a substrate; a plurality of light-emitting devices on the substrate; an adhesive film on the plurality of light-emitting devices; and a light modification sheet on the adhesive film. The light-modified sheet includes a plurality of light-modified patterns at least partially overlapping the plurality of light-emitting devices, the plurality of light-modified patterns have more than one layer, and the more than one layer includes a light-modified sheet facing the substrate. A top layer on the surface has an air gap between the more than one layer and the adhesive film.

In one embodiment, the one or more layers further include: an intermediate layer located on a surface of the top layer facing the substrate, and the size of the top layer is larger than the size of the intermediate layer.

In one embodiment, the one or more layers further include: a bottom layer located on a surface of the intermediate layer facing the substrate, and the size of the bottom layer is smaller than the size of the intermediate layer.

In one embodiment, the display device further includes a resin layer disposed on the plurality of light-emitting devices, wherein the adhesive film bonds the light modification sheet to the resin layer, and the air gap is located between the resin layer and the resin layer. Between light modifiers.

In one embodiment, the plurality of light modification patterns include: a light modification pattern that overlaps the peripheral area of the substrate and surrounds the central area of the substrate; and another light modification pattern that overlaps the central area of the substrate, The thickness of the one or more layers of the light modification pattern is smaller than the thickness of the one or more layers of the other light modification pattern.

In one embodiment, the plurality of light modification patterns include: a light modification pattern overlapping the peripheral area of the substrate and surrounding the central area of the substrate; and another second light modification pattern and the central area of the substrate Overlapping, the area of the one or more layers of the light modification pattern is smaller than the area of the one or more layers of the other light modification pattern.

In one embodiment, the plurality of light modification patterns include: a group of light modification patterns that overlap with the peripheral area of the substrate and surround the central area of the substrate; and another group of light modification patterns are connected to the central area of the substrate. Overlap, the interval between the group of light modification patterns is smaller than the interval between the other group of light modification patterns.

In one embodiment, the display device further includes a reflector disposed on the substrate, and the height of the reflector is greater than the height of the plurality of light-emitting devices.

In an embodiment, the reflector includes a plurality of holes, and each of the plurality of light-emitting devices is centered in the plurality of holes. In one embodiment, the holes are circular.

In one embodiment, the display device further includes: a phosphor film on the light modification sheet; and a diffusion plate on the phosphor film.

In one embodiment, the display device further includes more than one optical sheet located on the diffusion plate.

In various embodiments, a backlight unit includes: a light emitting unit including a plurality of light emitting devices; a phosphor film disposed on the light emitting unit; and a light modification part disposed around the light emitting unit and having a color.

In one embodiment, the light modification part is arranged on the same plane as the plurality of light-emitting devices.

In one embodiment, the light modification part is arranged on a plane different from another plane on which the plurality of light-emitting devices are arranged.

In one embodiment, the light-emitting unit includes: a substrate having a region in which the plurality of light-emitting devices are arranged, and the light-modified part is disposed around the region; and a resin layer is disposed on the substrate and the light-modified region. Part of the space. In one embodiment, a reflective film is coated on an upper surface of the substrate.

In one embodiment, the backlight unit further includes a light modification sheet located between the phosphor film and the light emitting unit, wherein the light modification sheet includes a plurality of light modification patterns, and the plurality of light modification patterns are arranged in and The corresponding positions of the plurality of light-emitting devices.

In one embodiment, the backlight unit further includes a guide panel including: an upper surface portion overlapping the light modification portion; and a side surface portion disposed on the side surface of the light emitting unit.

In various embodiments, a display device includes a display panel; and a backlight unit disposed under the display panel and configured to irradiate light to the display panel. The backlight unit includes: a light emitting unit including a plurality of light emitting devices; a phosphor film arranged on the light emitting unit; and a light modification part arranged around the light emitting unit and having a color.

10: Display device

100: display panel

120: Gate drive circuit

130: data drive circuit

140: Controller

200: Backlight unit

205: Resin layer

210: substrate

210a: Adhesive tape

211: Light-emitting device

211a: Light-emitting part

211b: Electrode part

212: reflector

215: Adhesive film

216: Light Modified Film

216p: light modification pattern

216pa, 216pb, 216pc, 216pd, 216pe, 216pf, 216pg: light modification pattern

217: diffuser

218: Phosphor film

219: optical sheet

220, 220a, 220b: light modification part

300: bottom cover

400: Boot panel

500: foam pad

a, b, c: path

A/A: Active area

BA: Boundary

D1, D2, D3, D4: interval

DATA: image data

DCS: data control signal

DL: Data line

EX1, EX2: Example

GCS: Gate control signal

GL: Gate line

N/A: Inactive area

S1, S2: size

SP: sub pixel

T1, T2: thickness

W1, W2: area

The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings, among which:

FIG. 1 is a structural diagram showing a display device according to an embodiment of the invention.

FIG. 2 is a schematic diagram showing a display device according to an embodiment of the invention.

FIG. 3 is a plan view showing a substrate of a backlight unit according to an embodiment of the present invention.

4 is a cross-sectional view showing an embodiment of a display device including a backlight unit, in which the substrate shown in FIG. 3 is used.

5 is a cross-sectional view showing another embodiment of a display device including a backlight unit, in which the substrate shown in FIG. 3 is used.

6 is a cross-sectional view showing still another embodiment of a display device including a backlight unit, in which the substrate shown in FIG. 3 is used.

7A to 7E are schematic diagrams showing an example of the specific structure of the backlight unit shown in FIG. 6.

FIG. 8 is a schematic diagram showing in detail the structure of the light-emitting device and the light modification sheet used in the backlight unit shown in FIG. 6.

9A and 9B are schematic diagrams showing examples of the structure according to the position of the light modification pattern included in the backlight unit shown in FIG. 8.

FIG. 10 is a perspective view showing an embodiment of the reflector used in the backlight unit shown in FIG. 6.

Fig. 11(a) and Fig. 11(b) are schematic diagrams comparing a case where a light modification part is not provided with a case where a light decoration part is provided according to an embodiment.

By referring to the embodiments of the present invention described in detail below and in conjunction with the accompanying drawings, the advantages and features of the present invention and the methods for achieving these advantages and features will become apparent. However, the present invention is not limited to the embodiments set forth below, but can be implemented in various different forms. The following embodiments are provided only to fully disclose the present invention, and to enable those with ordinary knowledge in the field of the present invention to know the scope of the present invention, and the present invention is only defined by the scope of the appended claims.

The shapes, sizes, ratios, angles, numbers, etc. shown in the drawings for explaining the embodiments of the present invention are exemplary, and therefore, the present invention is not limited to the content shown. Throughout the specification, the same or similar element symbols indicate the same or similar elements. In addition, in the description of the present invention, when it is determined that the detailed description of related well-known technologies unnecessarily obscure the subject of the present invention, the detailed description will be omitted. When the terms "include", "have", "include", etc. mentioned herein are used, unless the term "only" is used, any other components can be added. When an element is expressed in the singular, the element may encompass the plural form unless the element is clearly indicated.

In addition, when describing the elements in the embodiments of the present invention, even if no clear instructions are explicitly given, they should be interpreted as covering the tolerance range.

In addition, when describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used in the present invention. Each of these terms is not used to define the nature, sequence, or order of the corresponding component, but is only used to distinguish the corresponding component from other components. When describing a particular structural element to be "connected to", "coupled to" or "contact" another structural element, it should be interpreted as: the other structural element can be "connected to", "coupled to" or " "Contacting" these structural elements, and the specific structural element is directly connected to or directly in contact with the other structural element. When using, for example, "up", "above", "below", "side", etc. to describe two In the positional relationship between the two components, unless a term such as "just" or "direct" is used, more than one other component can be located between the two components.

In addition, the components in the embodiments of the present invention are not limited by these terms. These terms are only used to distinguish one component from another. Therefore, when a constituent element is referred to as a first constituent element below, it may be a second constituent element within the technical concept of the present invention.

In addition, the features (components) in the embodiments of the present invention may be partially or integrally coupled or combined with each other, or may be integrally separated from each other, various technical interlocking and driving may be performed, and each embodiment may be implemented independently of each other. , Or can be implemented in combination with each other.

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

FIG. 1 is a structural diagram showing a display device according to an embodiment of the invention.

1, a display device 10 according to an embodiment of the present invention may include: a display panel 100 including an active area A/A and a non-active area N/A; a gate driving circuit 120 for driving the display panel 100; a data driving circuit 130; Controller 140 and so on.

A plurality of gate lines GL and a plurality of data lines DL may be arranged in the display panel 100, and the sub-pixel SP may be arranged in an area where the gate line GL and the data line DL intersect each other. In addition, the display panel 100 may be a liquid crystal panel. The liquid crystal panel may include a pixel electrode, a common electrode, and a liquid crystal layer disposed between the pixel electrode and the common electrode. In the liquid crystal layer, the molecular arrangement is changed in response to the voltage applied to the pixel electrode and the common electrode to block or transmit light, thereby displaying an image.

The gate driving circuit 120 is controlled by the controller 140 and sequentially outputs scan signals to a plurality of gate lines GL provided on the display panel 100 to control the driving timing of the plurality of sub-pixels SP. The gate driving circuit 120 may include more than one gate driver integrated circuits (GDICs), and, depending on its driving method, the gate driving circuit 120 may be located only on one side of the display panel 100 or on the opposite side of the display panel 100. Side up. Each GDIC can be connected to the soldering pad of the display panel 100 through the tape-automated-bonding (TAB) method or the chip-on-glass (COG) method; or it can be implemented as an in-board gate A gate-in-panel (GIP) type, so as to be directly set on the display panel 100. In some cases, the GDIC may be integrated and disposed on the display panel 100. In addition, each GDIC may be implemented as a chip-on-film (COF) type, where the GDIC is mounted on a film connected to the display panel 100.

The data driving circuit 130 can receive the image data DATA from the controller 140, and can convert the image data DATA into an analog data voltage. According to the scan signal applied via the gate line GL The data driving circuit 130 outputs the data voltage to each data line DL so that each sub-pixel SP can express the brightness according to the image data DATA. The data driving circuit 130 may include more than one source driver integrated circuits (SDICs). Each SDIC can contain a shift register, a latch circuit, a digital-to-analog converter, and an output buffer. However, SDIC is not limited to this.

Each SDIC may be connected to the bonding pads of the display panel 100 through the TAB method or the COG method, or may be directly disposed on the display panel 100. In some cases, each SDIC may be integrated and disposed in the display panel 100. In addition, each SDIC can be implemented as a chip on film (COF) type. In this case, each SDIC may be mounted on a film connected to the display panel 100, and may be electrically connected to the display panel 100 via wiring on the film.

The controller 140 can supply various control signals to the gate drive circuit 120 and the data drive circuit 130, and can control the operations of the gate drive circuit 120 and the data drive circuit 130. The controller 140 can be mounted on a printed circuit board, a flexible printed circuit, etc., and can be electrically connected to the gate drive circuit 120 and the data drive circuit 130 via the printed circuit board, the flexible printed circuit, or the like. The controller 140 can make the gate driving circuit 120 output scanning signals according to the timing realized in each frame, can convert the image data received from the outside into the data signal format used by the data driving circuit 130, and can convert The subsequent image data is output to the data driving circuit 130. The controller 140 can receive various timing signals and image data from the outside (for example, a host system). The timing signals include: a vertical synchronization signal (VSYNC), a horizontal synchronization signal (HSYNC), an input data enable (DE) signal, and Clock signal (CLK).

The controller 140 may generate various control signals using various timing signals received from the outside, and may output various control signals to the gate driving circuit 120 and the data driving circuit 130. For example, in order to control the gate drive circuit 120, the controller 140 can output various gate control signals GCS, including: gate start pulse (GSP), gate shift clock (gate shift clock, GSC), gate output induced (GOE) signal, etc. Here, the GSP controls the operation start timing of one or more GDICs constituting the gate driving circuit 120. GSC is a clock signal that is usually input to more than one GDIC, and can control the shift timing of the scan signal. The GOE signal can specify more than one GDIC timing information.

In addition, in order to control the data driving circuit 130, the controller 140 can output various data control signals DCS, including: source start pulse (SSP), source sampling clock (source sampling clock, SSC), source output enable (SOE) ) Signal etc. Here, SSP can control to form a data drive circuit 130 data sampling start timing of more than one SDIC. The SSC may be a clock signal used to control the sampling timing of the data in each SDIC. The SOE signal can control the output timing of the data driving circuit 130.

The display device 10 may further include a power management IC configured to apply various voltages or currents to the display panel 100, the gate driving circuit 120, the data driving circuit 130, etc., or to control various voltages or currents to be applied.

FIG. 2 is a schematic diagram showing a display device according to an embodiment of the invention.

2, a display device 10 according to an embodiment of the present invention may include a display panel 100; and a backlight unit 200, which is disposed under the display panel 100 and configured to supply light to the display panel 100.

Various structures may be provided between the backlight unit 200 and the display panel 100. For example, the display panel 100 may be installed on the backlight unit 200 via the guide panel 400, the foam pad 500, etc., but the present invention is not limited thereto.

The backlight unit 200 may include a cover bottom 300 configured to accommodate optical elements and the like constituting the backlight unit 200.

The substrate 210 may be disposed on the bottom cover 300, and a plurality of light emitting devices 211 may be disposed on the substrate 210. The light emitting device 211 may be, for example, light emitting diodes (LEDs), or may be submillimeter light emitting diodes (mini LEDs) or micro light emitting diodes (micro LEDs). In addition, each light emitting device 211 may have a flip chip structure. The light-emitting devices 211 each having a flip-chip structure can be provided in a form in which the wafer-type light-emitting devices 211 are mounted on the substrate 210, and therefore, the thickness of the backlight unit 200 can be reduced, and can also be provided with a wide angle and height. Optically efficient light source. In addition, a reflective film may be coated on the substrate 210. The reflective film may be formed of white pigment. However, the reflective film is not limited to this. The reflective film can reflect light irradiated to the substrate 210, thereby improving optical efficiency. In addition, the reflector 212 shown in FIG. 6 below may be further provided on the substrate 210.

The light emitting device 211 may emit light in a white wavelength band, or in some cases, may emit light in a specific wavelength band (for example, a blue wavelength band). The substrate 210 may be a printed circuit board. In addition, the resin layer 205 may be provided on the substrate 210 on which a plurality of light emitting devices 211 are provided. The resin layer 205 may protect the plurality of light-emitting devices 211 and may provide a function of diffusing light emitted from the light-emitting devices 211.

A piece of adhesive film 215 may be provided on the resin layer 205. The adhesive film 215 may be an optical adhesive (OCA) film. A diffusion plate 217 configured to diffuse light incident from below may be provided on the adhesive film 215 on. In addition, a phosphor film 218 and an optical sheet 219 may be provided on the diffusion plate 217. Here, each of the phosphor film 218 and the optical sheet 219 is shown as one layer, but is not limited thereto.

In the backlight unit 200 configured as described above, the radiation angle of the light emitted by the light emitting device 211 may be close to 180 degrees. Among the light emitted from the light emitting device 211, the light having the path (a) may be reflected from the guide panel 400 to be irradiated to the display panel 100 without passing through the phosphor film 218 provided above the light emitting device 211. Due to such a problem, chromatic aberration may occur between the peripheral portion and the central portion of the display panel 100.

In addition, the backlight unit 200 may further include the light modification sheet 216 shown in FIG. 6 below. The light modification sheet 216 can scatter, reflect or diffract the light irradiated by the light emitting device 211. In addition, the light modification sheet 216 can transmit part of the light irradiated by the light emitting device 211. The light modification sheet 216 may be a light control sheet capable of transmitting a part of light. The light modification sheet 216 can prevent the generation of hot spots in the backlight unit 200. The light modification sheet may include a plurality of light modification patterns 216p, and the plurality of light modification patterns 216p may be disposed at positions corresponding to the plurality of light-emitting devices 211. The light modification pattern 216p shown in FIG. 6 can scatter, reflect or diffract the light emitted from the light emitting device 211. In addition, the light modification pattern 216p can scatter, reflect or diffract the light irradiated by the light emitting device 211. In addition, the light modification pattern 216p can transmit a part of the light irradiated by the light emitting device 211. The light modification pattern 216p may be a light control sheet capable of transmitting a part of light. The light irradiated by the light emitting device 211 is scattered, reflected, diffracted, or transmitted by the light modification pattern 216p, thereby making the brightness of the backlight unit 200 more uniform.

That is, by arranging the light modification pattern 216p in the region where the intensity of the light emitted from the light emitting device 211 is the highest, it is possible to reduce the gap between the region where the light emitting device 211 is provided (the region with a larger light amount) and the light emitting device 211. The brightness deviation between the regions (regions with a smaller amount of light). The light modification sheet 216 may include a light modification material. In addition, the light modification pattern 216p may include titanium dioxide (TiO ₂ ). In addition, the light modification material may be white. However, it is not limited to this.

In addition, since the transmitted light modification sheet 216 reduces the brightness deviation, it is possible to suppress the occurrence of mura in the peripheral area of the light emitting device 211 in the backlight unit 200. Therefore, the brightness of the light emitted from the backlight unit 200 may be uniform.

The diffusion plate 217 may be disposed on the light modification sheet 216 to diffuse the light incident from the bottom. In addition, the phosphor film 218 and one or more optical sheets 219 may be provided on the diffusion plate 217. When the light incident on the phosphor film 218 is blue light, the light may be converted into white light when passing through the phosphor film 218.

FIG. 3 is a plan view showing a substrate of a backlight unit according to an embodiment of the present invention.

3, the backlight unit 200 may include a substrate 210, and a light modification part 220 may be provided to correspond to a peripheral part of the substrate 210. The light modification part 220 may have a color. The peripheral portion of the substrate 210 may correspond to a region overlapping with the guide panel 400 shown in FIG. 2. The light modification part 220 includes a phosphor, and the color of the light modification part 220 may correspond to the color of the phosphor included in the light modification part 220. The material that gives the light modification part 220 a color is not limited to phosphors.

Here, the light modification part 220 provided on the peripheral portion of the substrate 210 may be in contact with the substrate 210 or may be spaced apart from the substrate 210 by a predetermined distance. Since the light modification part 220 has a color, the light having the path (a) of FIG. 2 among the light emitted from the light emitting device 211 may be excited by the light modification part 220 to have the color of the phosphor. That is, the color of the light emitted from the light emitting device 211 and the color of the light modification part 220 may be mixed. Therefore, the color difference generated between the peripheral portion and the central portion of the display panel 100 can be prevented or reduced. The color of the light passing through the light modification part 220 may be closer to the color of the light passing through the phosphor film 218 than the color of the light emitted by the light emitting device 211 (which has not passed through the light modification part 220 or the phosphor film 218). In some embodiments, the color of the light modification part 220 matches the color of the phosphor film 218.

4 is a cross-sectional view showing an embodiment of a display device including a backlight unit, in which the substrate shown in FIG. 3 is used; and FIG. 5 is a cross-sectional view of another embodiment of a display device including a backlight unit, in which the The substrate shown in Figure 3.

4, the substrate 210 may be provided on the bottom cover 300, and the light emitting device 211 may be provided on the substrate 210. In addition, the light modification part 220a may be disposed on the substrate 210 at a position adjacent to the guide panel 400 but not in physical contact with the guide panel 400. The light modification part 220a may be disposed on the same plane as the light emitting device 211. After the light modification part 220a is provided, the resin layer 205 may be disposed in the space constituted by the light modification part 220a and the substrate 210 and may be cured. Therefore, the light modification part 220a may be used as a dam to prevent the uncured resin layer 205 from leaking or overflowing to the outside of the substrate 210. A piece of adhesive film 215 may be provided on the resin layer 205. The adhesive film 215 may be an OCA film. A diffusion plate 217 configured to diffuse light incident from below may be provided on the adhesive film 215. In addition, the phosphor film 218 may be provided on the diffusion plate 217. In addition, the optical sheet 219 may be provided on the phosphor film 218. Here, although the phosphor film 218 is shown to be provided on the diffusion plate 217, the present invention is not limited to this, and the diffusion plate 217 may be provided on the phosphor film 218. In addition, the guide panel 400 may guide the position where the display panel 100 is provided on the backlight unit 200.

The light having the path (b) generated from the light emitting device 211 may be reflected by the guide panel 400 after passing through the light modification part 220a. Therefore, even if the light does not pass through the phosphor film 218, the light can be excited by the light modification portion 220a, thereby preventing or reducing the color difference generated between the peripheral portion and the central portion of the display panel 100.

Referring to FIG. 5, unlike FIG. 4, the light modification part 220 b may be provided to contact the inside of the guide panel 400. The light modification part 220b may be disposed on a plane different from the substrate 210. In addition, the light modification part 220b may be spaced apart from the substrate 210 by a predetermined distance above the substrate 210. In addition, the light generated from the light emitting device 211 and having the path (c) may be reflected from the guide panel 400 and then may pass through the light modification part 220b. Therefore, even if the light does not pass through the phosphor film 218, the light can be excited by the light modification portion 220b, thereby preventing or reducing the color difference generated between the peripheral portion and the central portion of the display panel 100. Here, the light modification part 220a in FIG. 4 and the light modification part 220b in FIG. 5 may be provided on the substrate 210 or inside the guide panel 400, respectively. However, the present invention is not limited thereto, and the light modification parts 220a, 220b may be provided on the substrate 210 and inside the guide panel 400 together. When the light modification parts 220a, 220b are provided on the substrate 210 and the inside of the guide panel 400 together, the light modification parts provided on the substrate 210 may or may not include phosphors. In addition, after the resin layer 205 is disposed in the space constituted by the substrate 210 and the light modification portion 220a, the resin layer 205 may be cured.

6 is a cross-sectional view showing still another embodiment of the structure of a display device including a backlight unit, in which the substrate shown in FIG. 3 is used.

6, the display device 10 according to an embodiment of the present invention may include a display panel 100; and a backlight unit 200 disposed under the display panel 100 and configured to supply light to the display panel 100.

Various structures may be provided between the backlight unit 200 and the display panel 100. For example, the display panel 100 may be fixed to the backlight unit 200 via the guide panel 400, the foam pad 500, etc., but the present invention is not limited thereto.

The backlight unit 200 may include a bottom cover 300 configured to accommodate optical elements and the like constituting the backlight unit 200.

The substrate 210 may be disposed on the bottom cover 300, and a plurality of light emitting devices 211 may be disposed on the substrate 210. The light emitting device 211 may be, for example, light emitting diodes (LEDs), or may be submillimeter light emitting diodes (mini LEDs) or micro light emitting diodes (micro LEDs). In addition, the light-emitting device 211 may be provided in a form in which the light-emitting device 211 of the wafer type is mounted on the substrate 210, so that the backside The thickness of the light unit can also provide a light source with a wide radiation angle and high optical efficiency. The wafer type light emitting device 211 configured to be mounted on the substrate 210 may be referred to as a light emitting device 211 having a flip chip structure.

The light emitting device 211 may emit light in a white wavelength band, or in some cases, may emit light in a specific wavelength band (for example, a blue wavelength band). The substrate 210 may be a printed circuit board, and the reflector 212 may be provided on at least a portion of the substrate 210 where the light emitting device 211 is not provided. The resin layer 205 may be provided on a plurality of light emitting devices 211 and reflectors 212. The resin layer 205 may protect the plurality of light-emitting devices 211 and may provide a function of diffusing light emitted from the light-emitting devices 211.

The light modification sheet 216 may be disposed on the resin layer 205. The light modification sheet 216 may include a plurality of light modification patterns 216p provided on the surface thereof facing the light emitting device 211. Here, a plurality of light modification patterns 216p may be disposed on the lower surface of the light modification sheet 216 at positions corresponding to the plurality of light emitting devices 211. The light modification pattern 216p includes more than one layer, and the more than one layer can scatter, reflect or diffract the light emitted from the light emitting device 211 in the vertical (or nearly vertical) direction, thereby improving the image quality of the backlight unit 200.

That is, by arranging the light modification pattern 216p in the region where the intensity of the light emitted from the light emitting device 211 is the highest, it is possible to reduce the gap between the region where the light emitting device 211 is provided (the region with a larger light amount) and the light emitting device 211. The brightness deviation between the regions (regions with a smaller amount of light). The light modification sheet 216 may include a light modification material. In addition, the light modification pattern 216p may include titanium dioxide (TiO ₂ ). In addition, the light modification material may be white. However, it is not limited to this.

In addition, since the transmitted light modification sheet 216 reduces the brightness deviation, it is possible to suppress speckles that appear in the peripheral area of the light emitting device 211 in the backlight unit 200. Therefore, the brightness of the light emitted from the backlight unit 200 may be uniform.

A diffusion plate 217 configured to diffuse light incident from below may be provided on the light modification sheet 216. In addition, the phosphor film 218 or one or more optical sheets 219 may be provided on the diffusion plate 217. When the light incident on the phosphor film 218 is blue light, the light may be converted into white light when passing through the phosphor film 218.

In addition, the light modification part 220 a may be provided on the side surface of the resin layer 205. The light modification part 220a may be used as a dam to prevent the uncured resin layer 205 from leaking or overflowing to the outside of the substrate 210. The light modification part 220a may include a phosphor. The light emitted from the light emitting device 211 may be reflected by the bottom cover 300 or the like and may be irradiated to the display panel 100 without passing through the phosphor film 218 provided above the resin layer 205. Such light passes through the light modification portion 220a. When the light modification part 220a contains a phosphor, even from The light emitted by the light emitting device 211 does not pass through the phosphor film 218, but may also pass through the light modification portion 220a to undergo color mixing. Therefore, the color difference generated between the peripheral portion and the central portion of the display panel 100 can be prevented.

7A to 7E are schematic diagrams showing an example of a specific structure of the backlight unit shown in FIG. 2.

Referring to FIG. 7A, a plurality of light emitting devices 211 may be provided on the substrate 210. A reflective film coated on the substrate 210 may be provided. The coated reflective film may be formed of white pigment. That is, a white pigment may be applied to the substrate 210.

Referring to FIG. 7B, the reflector 212 may be disposed on at least a part of the area of the substrate 210 except for the area where the light emitting device 211 is disposed.

The reflector 212 may have a shape in which an area corresponding to the light emitting device 211 is open, and may be firmly disposed on the substrate 210. The reflector 212 can reflect the light emitted from the light emitting device 211 to the front surface of the backlight unit (facing the display panel 100), thereby improving the optical efficiency of the backlight unit.

Here, when the light emitting device 211 is provided in the form of a wafer, since the size of the light emitting device 211 is small, the height of the reflector 212 may be greater than the height of the light emitting device 211.

Therefore, the light emitted in the lateral direction of the light emitting device 211 can be reflected by the side surface of the opening in the reflector 212 and can be emitted to the front surface of the backlight unit 200, thereby further improving the optical efficiency of the backlight unit 200.

Referring to FIG. 7C, the resin layer 205 may be provided on a plurality of light emitting devices 211 and reflectors 212. The resin layer 205 may contain, for example, resin. The resin layer 205 can be provided by providing a partition wall on the outside of the substrate 210 or the area where the plurality of light emitting devices 211 are provided, and applying resin in the partition wall. The resin layer 205 functions to protect a plurality of light emitting devices 211 provided on the substrate 210, and may provide a light guide plate function by diffusing light emitted from the light emitting devices 211. The light emitted from the light emitting device 211 may be more uniformly spread to the upper surface of the resin layer 205 by the resin layer 205. At this time, even if the light spreading direction is changed by the reflector 212 and the resin layer 205, the intensity of the light emitted in the vertical direction of the light emitting device 211 may be high, and therefore, the uniformity of the image may decrease.

According to the embodiment of the present invention, by disposing the light modification pattern 216p having optical characteristics such as scattering, reflection, and diffraction at a position corresponding to the light emitting device 211 on the resin layer 205, the uniformity of the image can be improved, and at the same time The thickness of the backlight unit 200 is reduced.

7D, the light modification sheet 216 may be disposed on the resin layer 205, and a plurality of light modification patterns 216p may be disposed on the lower surface of the light modification sheet 216. However, the present invention is not limited to this, and a plurality of light modification patterns 216p may be provided on the upper surface of the light modification sheet 216. The light modification sheet 216 can be adhered to the resin layer 205 through a piece of adhesive film 215. The adhesive film 215 may be an OCA film. The light modification sheet 216 may be made of, for example, PET or the like, but is not limited thereto. Each of the plurality of light modification patterns 216p provided on the lower surface of the light modification sheet 216 may be arranged to correspond to one of the plurality of light emitting devices 211 provided on the substrate 210. For example, the light modification pattern 216p may be set to at least partially overlap the light emitting device 211, and, considering the diffusion characteristics of light, the light modification pattern 216p may be set to overlap the area including the area in which the light emitting device 211 is provided. The light modification pattern 216p may scatter, reflect, diffract, or transmit light emitted from the light emitting device 211. For example, the light modification pattern 216p may scatter the light emitted from the light emitting device 211 to allow the light to be emitted from the light modification sheet 216. In addition, the light modification pattern 216p can reflect the light emitted from the light emitting device 211 in the vertical direction, and can cause the light to be reflected again by the reflector 212, so that the light is emitted to the area between the light emitting devices 211 or one of the light modification patterns 216p. Between areas.

As described above, the transmitted light modification pattern 216p can improve the image quality of the backlight unit by scattering, reflecting, diffracting, or transmitting the light emitted from the light emitting device 211.

7E, the diffusion plate 217 may be provided on the light modification sheet 216, and the phosphor film 218 may be provided on the diffusion plate 217. Then, at least one optical sheet 219 may be disposed on the phosphor film 218. Here, the disposition positions of the diffusion plate 217 and the phosphor film 218 may be exchanged with each other. The diffusion plate 217 can diffuse the light emitted through the light modification sheet 216.

The phosphor film 218 may include a phosphor having a specific color, and may excite incident light to emit light of a specific wavelength band. Therefore, the light passing through the phosphor film 218 may have a specific color contained in the phosphor film 218 or a color mixed with the specific color. For example, in the case where the light emitting device 211 emits light in the first wavelength band (for example, blue light), the phosphor film 218 may emit light in the second wavelength band (for example, green light) and light in the third wavelength band (for example, red light). Light) in response to the light incident on it. Therefore, in the case where the light emitting device 211 emits blue light, when the blue light passes through the phosphor film 218, the blue light may be converted and emitted into white light.

As another example, the phosphor contained in the phosphor film 218 may be yellow, green-red, or yellow-red.

Therefore, in the case where the light emitting device 211 emits blue light, when the blue light passes through the phosphor film 218, the blue light may be mixed with the color of the phosphor and may be converted and emitted into white light.

In some cases, the phosphor film 218 may be provided in a partial area on the diffusion plate 217. For example, when the light emitting device 211 emits light in the blue wavelength band, the phosphor film 218 may be provided only in a region other than the region corresponding to the region where the blue sub-pixel SP is arranged in the display panel 100. That is, the light that has not passed through the phosphor film 218 can reach the blue sub-pixel SP of the display panel 100. In addition, the phosphor film 218 may not be provided along the light emitting device 211. For example, when the light emitting device 211 emits light in the white wavelength band or a color conversion film that emits light in the green wavelength band and the light in the red wavelength band is coated on its light emitting surface, the phosphor film 218 may not be provided.

As described above, by providing the light modification sheet 216 including the light modification pattern 216p provided at the position corresponding to the light-emitting device 211 and various optical elements, the embodiment of the present invention can improve the image quality of the backlight unit while reducing the size of the backlight unit. thickness of.

Hereinafter, the embodiment of the present invention will be described with a specific example of the light modification pattern 216p provided on the light modification sheet 216.

FIG. 8 is a plan view showing the structure of a backlight unit according to an embodiment of the present invention.

Referring to FIG. 8, a substrate 210 may be disposed on the bottom cover 300, and the substrate 210 may be coupled to the bottom cover 300 through an adhesive tape 210a disposed between the bottom cover 300 and the substrate 210.

A plurality of light emitting devices 211 may be provided on the substrate 210, and the reflector 212 may be provided on at least a part of the area of the substrate 210 except for the area where the light emitting device 211 is provided.

Here, each light emitting device 211 may be, for example, an LED, and may include a light emitting part 211a and an electrode part 211b, and the light emitting part 211a includes an n-type semiconductor layer, an active layer, and a p-type semiconductor layer. The resin layer 205 may be provided on a plurality of light emitting devices 211 and reflectors 212. The light modification sheet 216 may be disposed on the resin layer 205, and a light modification pattern 216p is disposed on the light modification sheet 216 at a position corresponding to the light emitting device 211. Then, the diffusion plate 217, the phosphor film 218, the optical sheet 219, and the like may be disposed on the light modification sheet 216.

By printing a substance with light modification properties on the light modification sheet 216, the light modification pattern 216p provided on the lower surface of the light modification sheet 216 can be realized. For example, the light modification pattern 216p can be set by a method of printing _{TiO 2 ink on the light modification sheet 216.} In addition, the light modification patterns 216p provided on the lower surface of the light modification sheet 216 may be arranged in one layer, or may be arranged in a multilayer structure. That is, as shown in FIG. 8, the light modification pattern 216p provided on the lower surface of the light modification sheet 216 may be arranged in three layers. The photo-modifying pattern 216p can be realized by printing the photo-modifying substance on the photo-modifying sheet 216 three times, and the area of the photo-modifying substance to be printed can be gradually narrowed. Then, the light modification pattern 216p can be disposed on the light emitting device 211 by inverting the light modification sheet 216 on which the light modification pattern 216p is disposed and disposed on the resin layer 205.

Therefore, the area of the light modification pattern 216p may gradually become narrower in a direction away from the bottom of the light modification sheet 216, and the thickness of each light modification pattern 216p may be greater in its central portion than its outer (peripheral) portion.

That is, since the intensity of the light emitted in the vertical direction from the light emitting device 211 is greater than the intensity of the light emitted in the oblique or lateral direction, the central part of the light modification pattern 216p may be configured to be thicker than other parts. However, the present invention is not limited to this.

By disposing the light modification pattern 216p on the light emitting device 211 as described above, it is possible to prevent or reduce the occurrence of hot spots by scattering, reflecting, diffracting or blocking a part of the light emitted from the light emitting device 211 in the vertical direction. In the area of the device 211. The light modification sheet 216 on which the light modification pattern 216p is provided can be bonded to the resin layer 205 through the adhesive film 215. At this time, the adhesive film 215 may be disposed in at least a part of the area on the lower surface of the light modification sheet 216 except for the area where the light modification pattern 216p is disposed.

Therefore, the adhesive film 215 may not be disposed in the area where the light modification pattern 216p is disposed, and there may be an air gap between the light modification pattern 216p and the resin layer 205. In addition, the side portion of the light modification pattern 216p and the adhesive film 215 may be spaced apart from each other. Since there is an air gap between the light modification pattern 216p and the resin layer 205, light emitted in the lateral direction of the light modification pattern 216p may be reflected by the air gap through the light modification sheet 216 and toward the display panel 100. That is, the light emitted in the lateral direction of the light modification pattern 216p may be emitted by an air layer having a low refractive index at a large refraction angle, or may be reflected by the air layer. Since the light reflected by the air layer is emitted after being reflected again by the reflector 212, it is possible to improve the optical efficiency while assisting the light modification function of the light modification pattern 216p.

As described above, by arranging the light modification pattern 216p and the air gap at the position corresponding to the light emitting device 211, the optical efficiency of the backlight unit can be improved while preventing or reducing hot spots. In addition, the light modification patterns 216p disposed on the lower surface of the light modification sheet 216 may be arranged in different structures according to the positions where they are disposed.

9A and 9B are schematic diagrams showing examples of the structure according to the position of the light modification pattern included in the backlight unit shown in FIG. 8.

9A, there is shown an example of the brightness generated by the backlight unit according to the structure of the light modification pattern 216p, in which Example EX1 shows when the light modification pattern 216p is arranged as a fixed structure An example of the measured brightness, and Example EX2 shows an example of the measured brightness when the light modification pattern 216p is arranged in a different structure according to its position.

As shown in the example EX1 in FIG. 9A, when the structure of the light modification pattern 216pa arranged in the outer area of the backlight unit 200 and the structure of the light modification pattern 216pc, 216pd arranged in the central area are the same (for example, the same thickness or Size), the brightness of the outer (peripheral) area of the backlight unit may be lower than the brightness of the central area of the backlight unit.

That is, since in the outer area of the backlight unit 200, the number of light emitting devices 211 that supply light to the corresponding area is relatively small compared to the central area, when the light modification pattern 216p having the same degree of light modification characteristics is provided , The brightness of the outer area may be lower than that of the central area of the backlight unit.

Therefore, as shown in the example EX2 in FIG. 9A, by arranging the light modification pattern 216pa provided in the outer area of the backlight unit 200 and the light modification pattern 216pd provided in the central area of the backlight unit 200 to have different structures , The brightness of the outer area of the backlight unit 200 can be prevented from deteriorating, and the overall brightness can be made more uniform.

For example, the light modification pattern 216p may be arranged such that the thickness T1 of the light modification pattern 216pa arranged in the outer area of the backlight unit 200 is smaller than the thickness T2 of the light modification pattern 216pd arranged in the central area.

Alternatively, the light modification pattern 216p may be arranged such that the area W1 of the thickest part of the light modification pattern 216pb disposed adjacent to the outer region of the backlight unit 200 is smaller than the area W2 of the thickest part of the light modification pattern 216pd. That is, in the light modification pattern 216pa provided in the outer area of the backlight unit 200 and the light modification pattern 216pb provided in the area adjacent to the outer area, the area of the portion having the higher blocking characteristic is made smaller.

In addition, the light modification pattern 216p may be arranged such that the thickness of the light modification pattern 216p gradually decreases from the central area of the backlight unit 200 toward the outer area, or the area of the thickest part of the light modification pattern 216p gradually decreases. That is, in the light modification pattern 216pd provided in the outer region of the backlight unit 200 and the light modification pattern 216pb provided adjacent to the outer region, the area of the portion having the high blocking characteristic is made smaller.

In addition, the thickness of the light modification pattern 216p gradually decreases from the central region of the backlight unit 200 toward the outer region, or the area of the thickest part of the light modification pattern 216p gradually decreases.

In addition, in some cases, the light modification pattern 216p may be arranged in a different manner so that the number or interval of the light emitting devices 211 is different between the central area and the outer area of the backlight unit 200.

9B, another example of a structure in which the light modification pattern 216p is provided on the lower surface of the light modification sheet 216 is shown.

Here, the distance between the light emitting devices 211 provided in the outer area of the backlight unit 200 may be smaller than the distance between the light emitting devices 211 provided in the central area of the backlight unit 200. That is, the light emitting device 211 may be arranged in a structure in which the light emitting device 211 is more densely disposed in the outer area of the backlight unit 200 so that the brightness becomes uniform in the central area and the outer area of the backlight unit 200.

In addition, since the light modification patterns 216p provided on the lower surface of the light modification sheet 216 are arranged to correspond to the light emitting device 211, the interval between the light modification patterns 216p provided in the outer area of the backlight unit 200 may be the same as that provided in the center. The intervals between the light modification patterns 216p in the regions are different.

As an example, the interval D1 of the light modification patterns 216p arranged in the outer area of the backlight unit 200 in the first direction may be smaller than the interval D2 of the light modification patterns 216p arranged in the central area in the first direction. In addition, the interval D3 of the light modification patterns 216p provided in the outer region of the backlight unit 200 in the second direction may be smaller than the interval D4 of the light modification patterns 216p provided in the central region in the second direction.

The size, thickness, etc. of the light modification pattern 216p provided in the outer region of the backlight unit 200 may be different from the size, thickness, etc. of the light modification pattern 216p provided in the central region of the backlight unit 200.

For example, as shown in FIG. 9B, the size S1 of the light modification patterns 216pe and 216pf provided in the outer area of the backlight unit 200 may be smaller than the size S2 of the light modification pattern 216pg provided in the central area of the backlight unit 200.

Alternatively, the light modification pattern 216p may have a multilayer structure as described above. In this case, the thickness of the light modification patterns 216pe and 216pf provided in the outer region of the backlight unit 200 may be smaller than the thickness of the light modification patterns 216pg provided in the central region of the backlight unit, or the light modification patterns 216pe and 216pf The area of the portion having the largest thickness in the light modification pattern 216pg may be smaller than the area of the portion having the largest thickness in the light modification pattern 216pg.

That is, by reducing the size of the light modification patterns 216pe and 216pf provided in the outer area of the backlight unit 200, the light modification patterns 216pe and 216pf can be set to correspond to those arranged at small intervals. 光光装置211。 Light emitting device 211. Therefore, it is possible to prevent or reduce a hot spot generated at a position corresponding to the light emitting device 211 in the outer area of the backlight unit 200.

In addition, by reducing the degree to which light emitted from the light emitting device 211 is scattered, reflected, diffracted, or blocked in the outer area of the backlight unit 200, the amount of light to be emitted is increased, and the brightness of the outer area of the backlight unit 200 is improved. . Therefore, the entire area of the display panel 100 can exhibit more uniform brightness.

As described above, by arranging the light modification patterns 216p in a structure having different areas in the backlight unit 200, it is possible to prevent or alleviate the brightness reduction in the outer area of the backlight unit 200, and it is possible to improve the uniformity of the brightness.

In addition, through the structure in which the above-mentioned light modification pattern 216p is provided, hot spots of the backlight unit 200 can be prevented or reduced, and the uniformity of brightness can be improved.

The embodiment of the present invention can also provide a method for improving the image quality of the backlight unit 200 while increasing the optical efficiency of the backlight unit 200 by diffracting the light emitted in the vertical direction of the light emitting device 211.

FIG. 10 is a perspective view showing an embodiment of the reflector used in the backlight unit shown in FIG. 6.

Referring to FIG. 10, the reflector 212 may be provided to correspond to the substrate 210. The reflector 212 may include a plurality of holes. The light emitting device can be arranged in the center of each hole. However, the present invention is not limited to this. Here, although the shape of the hole is shown as a circle, the present invention is not limited to this.

Fig. 11(a) and Fig. 11(b) are schematic diagrams comparing the case where the light modification part is not provided with the case where the light decoration part is provided.

11(a) and 11(a), since the light emitted from the backlight unit 200 has a higher color temperature than normal white light before passing through the display panel 100, the white light passing through the light modification sheet 216 and the phosphor film 218 Has a light blue color.

Fig. 11(a) shows a case where the light modification part 220 shown in Fig. 3 is not provided, in which the boundary between a part of the non-active area N/A covered by the guide panel 400 and the active area A/A A narrow strip appears at BA. On the contrary, FIG. 11(b) shows a case where the light modification part 220 is provided, in which it can be seen that due to the boundary between a part of the non-active area N/A of the guide panel 400 and the active area A/A No bands appear at BA, so the boundary BA clearly appears. That is, it can be seen that by arranging the light modification part 220 corresponding to the peripheral part of the substrate of the backlight unit 200, the image quality deterioration due to the mixing of light in the active area A/A is prevented.

The above description and drawings provide an example of the technical idea of the present invention for illustrative purposes only. Those with ordinary knowledge in the technical field to which the present invention belongs should understand that various modifications and alterations in form, such as combinations, separations, substitutions and alterations of configurations, are possible without departing from the basic characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate the scope of the technical concept of the present invention, and the scope of the present invention is not limited by the embodiments. The scope of the present invention should be interpreted on the basis of the appended claims, so that all technical ideas included in the equivalent scope of the claims belong to the present invention.

The present invention claims the priority rights of Korean Patent Application No. 10-2018-0163499 filed on December 17, 2018 and Korean Patent Application No. 10-2019-0133034 filed on October 24, 2019, which are based on All purposes are incorporated herein by reference, as if fully stated in this article.

10: Display device

100: display panel

120: Gate drive circuit

130: data drive circuit

140: Controller

A/A: Active area

DATA: image data

DCS: data control signal

DL: Data line

GCS: Gate control signal

GL: Gate line

N/A: Inactive area

SP: sub pixel

Claims (33)

A display device includes: a display panel; and a backlight unit, including: a substrate; a phosphor film on the substrate; a plurality of light emitting devices on the substrate and between the substrate and the phosphor film, The plurality of light-emitting devices emit light, a part of the emitted light travels along a first path through the phosphor film, and another part of the emitted light travels along a second path that does not pass through the Phosphor film; and a light modification part located in the second path and changing the color of the other part of the light emitted so that the color of the light emitted at the plurality of light-emitting devices is changed The color is closer to the color of light passing through the portion of the phosphor film. For example, the display device of claim 1, further comprising: a bottom cover located under the backlight unit; and a guide panel located on the bottom cover, the display panel is mounted on the guide panel, and the guide panel is configured to reflect along The other part of the emitted light traveling along the second path. The display device of claim 2, wherein the guide panel includes a surface facing the substrate, and the light modification part is in physical contact with the surface. The display device of claim 3, wherein the light modification part is located above the phosphor film. Such as the display device of claim 2, wherein the light modification part is in physical contact with the bottom cover. The display device of claim 5, wherein the light modification part is in physical contact with the guide panel and the substrate. The display device of claim 2, wherein the light modification part is located between the substrate and the phosphor film. Such as the display device of claim 7, wherein the light modification part is located on the same plane as the plurality of light-emitting devices. A display device includes: A display panel; and A backlight unit, including: A substrate; A plurality of light emitting devices are located on the substrate; An adhesive film on the plurality of light-emitting devices; and A light-modified sheet is located on the adhesive film, the light-modified sheet includes a plurality of light-modified patterns at least partially overlapping the plurality of light-emitting devices, the plurality of light-modified patterns have more than one layer, and the more than one layer A top layer is included on a surface of the light modification sheet facing the substrate, and there is an air gap between the one or more layers and the adhesive film. For example, the display device of claim 9, wherein the one or more layers further include: An intermediate layer is located on a surface of the top layer facing the substrate, and the size of the top layer is larger than the size of the intermediate layer. For example, the display device of claim 10, wherein the one or more layers further include: A bottom layer is located on a surface of the middle layer facing the substrate, and the size of the bottom layer is smaller than the size of the middle layer. For example, the display device of claim 9 further includes: A resin layer is arranged on the plurality of light-emitting devices, wherein the adhesive film combines the light modification sheet to the resin layer, and the air gap is located between the resin layer and the light modification sheet. For example, the display device of claim 9, wherein the plurality of light modification patterns include: A light modification pattern that overlaps a peripheral area of the substrate and surrounds a central area of the substrate; and Another light modification pattern overlaps the central area of the substrate, and the thickness of the one or more layers of the light modification pattern is smaller than the thickness of the one or more layers of the other light modification pattern. For example, the display device of claim 9, wherein the plurality of light modification patterns include: A light modification pattern that overlaps a peripheral area of the substrate and surrounds a central area of the substrate; and Another light modification pattern overlaps the central area of the substrate, and the area of the one or more layers of the light modification pattern is smaller than the area of the one or more layers of the other light modification pattern. For example, the display device of claim 9, wherein the plurality of light modification patterns include: A set of light modification patterns that overlap a peripheral area of the substrate and surround a central area of the substrate; and Another group of light modification patterns overlaps the central area of the substrate, and the interval between the group of light modification patterns is smaller than the interval between the other group of light modification patterns. For example, the display device of claim 9 further includes: A reflector is arranged on the substrate, and the height of the reflector is greater than the height of the plurality of light-emitting devices. The display device of claim 16, wherein the reflector includes a plurality of holes, and each of the plurality of light-emitting devices is located in the center of the plurality of holes. Such as the display device of claim 17, wherein the holes are circular. For example, the display device of claim 9 also includes: A phosphor film on the light modification sheet; and A diffusion plate is located on the phosphor film. Such as the display device of claim 19, which also includes: More than one optical sheet is located on the diffuser plate. A backlight unit includes: A light-emitting unit including a plurality of light-emitting devices; A phosphor film disposed on the light-emitting unit; and A light modification part is arranged around the light-emitting unit and has a color. The backlight unit of claim 21, wherein the light modification part is arranged on the same plane as the plurality of light-emitting devices. Such as the backlight unit of claim 21, wherein the light modification part is arranged on a plane different from another plane on which the plurality of light-emitting devices are arranged. Such as the backlight unit of claim 21, wherein the light-emitting unit includes: A substrate having a region in which the plurality of light-emitting devices are arranged, and the light modification part is arranged around the region; and A resin layer is arranged in the space formed by the substrate and the light modification part. The backlight unit of claim 24, wherein a reflective film is coated on an upper surface of the substrate. For example, the backlight unit of claim 21 further includes: A light modification sheet is located between the phosphor film and the light emitting unit, wherein the light modification sheet includes a plurality of light modification patterns, and the plurality of light modification patterns are arranged at positions corresponding to the plurality of light emitting devices. For example, the backlight unit of claim 21 also includes: A guide panel includes: an upper surface part overlapping with the light modification part; and a side surface part arranged on a side surface of the light-emitting unit. A display device includes: A display panel; and A backlight unit arranged under the display panel and configured to irradiate light to the display panel, Wherein, the backlight unit includes: A light-emitting unit including a plurality of light-emitting devices; A phosphor film disposed on the light-emitting unit; and A light modification part is arranged around the light-emitting unit and has a color. Such as the display device of claim 28, wherein the light modification part is arranged on the same plane as the plurality of light-emitting devices. For example, the display device of claim 28, wherein the light modification part is arranged on a plane different from another plane on which the plurality of light-emitting devices are arranged. For example, the display device of claim 28, wherein the light-emitting unit includes: A substrate having a region in which the plurality of light-emitting devices are arranged, and the light modification part is arranged around the region; and A resin layer is arranged in the space formed by the substrate and the light modification part. The display device of claim 31, wherein a reflective film is coated on an upper surface of the substrate. For example, the display device of claim 28 further includes: A light modification sheet is arranged between the phosphor film and the light emitting unit, wherein the light modification sheet includes a plurality of light modification patterns, and the plurality of light modification patterns are arranged at positions corresponding to the plurality of light emitting devices.

Images