KR20210116221A - Display apparatus - Google Patents

Abstract

A display apparatus capable of reducing the width of a bezel is disclosed. The disclosed display apparatus includes: a liquid crystal panel; a light source configured to provide light to the liquid crystal panel; and an optical member disposed between the liquid crystal panel and the light source. The optical member includes a diffusion sheet provided to diffuse the light incident from the light source, and a deformation preventing layer comprising a material having a smaller expansion or contraction rate than that of the diffusion sheet.

Description

display device {DISPLAY APPARATUS}

The present invention relates to a display device, and more particularly, to a display device having an improved optical structure.

A display device is a type of output device that visually displays data information such as text or figures and an image, and includes a television, various monitors, and various portable terminals (eg, notebook computers, tablet PCs, and smart phones).

The display device is a light-emitting type that uses a display panel that emits light by itself, such as an organic light emitting diode (OLED), and cannot emit light by itself like a liquid crystal display (LCD) and needs to be supplied with light from a backlight unit. It can be classified as a light-receiving type using a display panel.

The backlight unit may be composed of a light source such as a Cold Cathode Fluorescent Lamp (CCFL), an External Electrode Fluorescent Lamp (EEFL), and an LED (Light Emitting Diode), and various optical auxiliary materials. .

The backlight unit may be classified into a direct type in which the light source is disposed at the rear of the display panel and an edge type in which the light source is disposed at a side of the display panel according to the position of the light source.

One aspect of the present invention provides a display device capable of reducing a width of a bezel.

Another aspect of the present invention provides a display device with improved productivity.

Another aspect of the present invention provides a slim display device.

Another aspect of the present invention provides a display device capable of securing rigidity.

Another aspect of the present invention provides a display device having an improved contrast ratio.

Another aspect of the present invention provides a display device capable of increasing recycling efficiency of light emitted from a quantum dot sheet.

A display device according to an aspect of the present invention includes a liquid crystal panel, a light source provided to provide light to the liquid crystal panel, and an optical member disposed between the liquid crystal panel and the light source, wherein the optical member is incident from the light source and a diffusion sheet provided to diffuse light, and a deformation preventing layer including a material having a smaller expansion or contraction rate than that of the diffusion sheet.

The optical member may include a quantum dot sheet disposed on the other side opposite to one side on which the diffusion sheet of the deformation prevention layer is disposed.

The optical member includes a prism sheet disposed on the other side opposite to one side on which the deformation prevention layer of the quantum dot sheet is disposed, and the quantum dot sheet includes an air layer formed on one side facing the prism sheet can do.

The deformation prevention layer may include a material having a smaller coefficient of thermal expansion than the diffusion sheet and the quantum dot sheet.

The deformation preventing layer may be stacked in front of the diffusion sheet, and the quantum dot sheet may be stacked in front of the deformation preventing layer.

The optical member may include a reflective polarizing film provided to transmit a portion of the passing light and reflect the other portion, and a condensing prism pattern formed on one side of the reflective polarizing film toward the liquid crystal panel. .

A vertex angle of the cross section of the light collecting prism pattern may be an obtuse angle.

The optical member may be integrally formed.

The deformation prevention layer may include glass.

The diffusion sheet may include a diffusion bead formed to diffuse incident light, and a diffusion prism pattern formed to change a path of light passing through the diffusion bead.

The deformation prevention layer may include a material having a higher light transmittance than the diffusion sheet.

The anti-deformation layer may include a material having a lower light absorption than the diffusion sheet.

The display device may further include a chassis assembly including a bezel supporting an edge of the optical member.

The diffusion sheet may include a diffusion bead formed to diffuse incident light, and a diffusion pattern formed to shield or diffuse light passing through the diffusion bead.

The optical member may include a reflective polarizing film provided to transmit a portion of the passing light and reflect another portion, and a protective bead formed on one side of the reflective polarizing film toward the liquid crystal panel.

and a prism sheet disposed between the quantum dot sheet and the reflective polarizing film, wherein the prism sheet includes a first prism pattern extending in a first direction, and a second direction extending in a second direction perpendicular to the first direction. 2 may include a prism pattern.

The display device may further include a reflective sheet disposed behind the optical member.

The diffusion sheet may include a base layer that is in contact with the deformation prevention layer and includes poly ethylene terephthalate (PET) or poly styrene (PS).

In another aspect, a display device according to an aspect of the present invention includes a liquid crystal panel, a light source provided to provide light to the liquid crystal panel, and an optical member disposed between the liquid crystal panel and the light source, wherein the optical member includes the light source A diffusion sheet provided to diffuse light incident from the diffusion sheet, a quantum dot sheet provided to convert light passing through the diffusion sheet, and disposed between the diffusion sheet and the quantum dot sheet, the diffusion sheet or the quantum dot sheet A deformation preventing layer comprising a material having a smaller coefficient of thermal expansion, a reflective polarizing film and the reflective polarizing film disposed in front of the deformation preventing layer and provided to transmit a portion of the passing light and reflect the other portion and a condensing prism pattern formed on one side facing the liquid crystal panel.

The optical member may further include a prism sheet disposed between the quantum dot sheet and the reflective polarizing film, and an air layer may be formed between the quantum dot sheet and the prism sheet.

The anti-deformation layer may include a material having a higher light transmittance and lower light absorption than the diffusion sheet and the quantum dot sheet.

The diffusion sheet may include a diffusion bead formed to diffuse incident light, and a diffusion prism pattern formed to change a path of light passing through the diffusion bead.

The optical member may be integrally formed.

According to the spirit of the present invention, since the display device includes the anti-deformation layer, the width of the bezel can be reduced.

According to the spirit of the present invention, since the optical member is integrally formed in the display device, productivity may be improved.

According to the spirit of the present invention, since the optical member is integrally formed in the display device, the thickness can be reduced.

According to the spirit of the present invention, since the optical member is integrally formed in the display device, rigidity can be secured.

According to the spirit of the present invention, since the condensing prism pattern is provided in front of the reflective polarizing film of the optical member in the display device, the contrast ratio can be improved.

According to the spirit of the present invention, since the display device includes the air layer, it is possible to increase the recycling efficiency of light emitted from the quantum dot sheet.

1 is a diagram illustrating an external appearance of a display device according to an embodiment of the present invention.
FIG. 2 is an exploded view illustrating main components of the display device shown in FIG. 1 .
FIG. 3 is a view schematically illustrating a cross-section of the optical member shown in FIG. 2 .
FIG. 4 is a view schematically illustrating light from a diffusion sheet and a deformation preventing layer of the optical member shown in FIG. 3 .
FIG. 5 is a diagram schematically illustrating an action of a deformation preventing layer of the optical member shown in FIG. 3 .
6 is a view schematically illustrating the operation of the quantum dot sheet of the optical member shown in FIG. 3 .
FIG. 7 is a view schematically illustrating light from a prism sheet of the optical member shown in FIG. 3 .
FIG. 8 is a view schematically illustrating light from the reflective polarizing sheet of the optical member shown in FIG. 3 .
9 is a view schematically showing a cross-section of an optical member according to another embodiment of the present invention.

Since the embodiments described in the present specification are only the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, various equivalents or modifications that can be substituted for them at the time of the present application are also provided in the present invention. It should be understood to be included in the scope of the rights of

A singular expression used in the description may include a plural expression unless the context clearly indicates otherwise. The shapes and sizes of elements in the drawings may be exaggerated for a clear description.

In this specification, terms such as 'comprise' or 'have' are intended to refer to the presence of a feature, number, step, operation, component, part, or a combination thereof described in the specification, but one or more other features or It is to be understood that the existence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

The directions of “front” and “rear” will be uniformly referred to throughout the specification based on the direction illustrated in FIG. 1 . 1 , the X-axis, Y-axis, and Z-axis directions perpendicular to each other are indicated, the X-axis direction means the long side 11 direction of the liquid crystal panel 10 , and the Y-axis direction is the short side of the liquid crystal panel 10 . (12) means the direction, and the Z-axis direction means the front-back direction.

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

1 is a diagram illustrating an external appearance of a display device according to an embodiment of the present invention. FIG. 2 is an exploded view illustrating main components of the display device shown in FIG. 1 .

Hereinafter, a display device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2 .

The display device 1 includes a liquid crystal panel 10 for displaying an image, a backlight unit disposed behind the liquid crystal panel 10 to provide light to the liquid crystal panel 10 , a backlight unit and the liquid crystal panel 10 . and a supporting chassis assembly.

The chassis assembly includes a rear chassis 40 provided to support the backlight unit, a front chassis 20 provided in front of the rear chassis 40 to support the liquid crystal panel 10 , the front chassis 20 and the rear chassis It may include a middle mold 30 coupled between the (40). The chassis assembly may accommodate the liquid crystal panel 10 .

The liquid crystal panel 10 is injected between a thin film transistor substrate in which thin film transistors are formed in a matrix form, a color filter substrate coupled in parallel with the thin film transistor substrate, and the thin film transistor substrate and the color filter substrate to obtain optical power according to changes in voltage or temperature. It may include a liquid crystal having variable properties.

The backlight unit may be disposed at the rear of the liquid crystal panel 10 to illuminate the liquid crystal panel 10 . The backlight unit includes a light source device 80 including a light source 81 and a printed circuit board 82 on which the light source 81 is mounted, and optical members disposed on a movement path of light emitted from the light source 81 . may include A plurality of light source devices 80 may be provided to be spaced apart from each other.

A plurality of light sources 81 may be mounted in a row on the PCB 82 . A driving power line for supplying driving power to the light sources 81 may be formed on the PCB 82 , and may be connected to a signal cable (not shown) and a backlight driving circuit (not shown). The PCB 82 may be received in a chassis assembly.

The display device 1 may include a reflector sheet 90 that reflects light to prevent loss. The reflective sheet 90 may reflect the light emitted from the light source 81 or the light emitted backward from the optical member 100 to the optical member 100 . The reflective sheet 90 may be disposed in front of the PCB 82 . The reflective sheet 90 may be in close contact with the front of the PCB 82 . A through hole 91 may be formed in the reflective sheet 90 to allow the light source 81 to pass therethrough.

The rear chassis 40 is disposed at the rear of the backlight unit. The rear chassis 40 may have a plate shape in which an edge portion is bent forward. A backlight unit may be accommodated between the rear chassis 40 and the front chassis 20 .

The rear chassis 40 may function to radiate heat generated from a heat generating element such as the light source 81 to the outside. To this end, the rear chassis 40 may be formed of various metal materials such as aluminum and SUS, or plastic materials such as ABS.

The front chassis 20 may have a frame shape having an opening 23 so that light from the backlight unit is provided to the liquid crystal panel 10 . The front chassis 20 may include a bezel formed at the edge of the opening 23 to have a predetermined width. The bezel may cover a portion of the front surface of the edge of the optical member 100 .

The middle mold 30 may support the optical member 100 and reflect the light emitted from the light source device 80 to the optical member 100 . The middle mold 30 may maintain a gap between the optical member 100 and the light source device 80 . The middle mold 30 may be coupled between the front chassis 20 and the rear chassis 40 .

The middle mold 30 may be formed in a frame shape having an opening 31 ( FIG. 2 ). A light source device 80 may be disposed in the opening 31 . A material having high reflectivity may be coated on the surface of the middle mold 30 . The high reflectance material may be coated on the entire surface or a portion of the middle mold 30 . All or a portion of the middle mold 30 may have a white color so that light is well reflected.

The optical member 100 may be disposed on a movement path of the light emitted from the light source 81 to guide the traveling direction of the light, reflect the light, diffuse the light, or improve optical characteristics.

FIG. 3 is a view schematically illustrating a cross-section of the optical member shown in FIG. 2 . FIG. 4 is a view schematically illustrating light from a diffusion sheet and a deformation preventing layer of the optical member shown in FIG. 3 . FIG. 5 is a diagram schematically illustrating an action of a deformation preventing layer of the optical member shown in FIG. 3 . 6 is a view schematically illustrating the operation of the quantum dot sheet of the optical member shown in FIG. 3 . FIG. 7 is a view schematically illustrating light from a prism sheet of the optical member shown in FIG. 3 . FIG. 8 is a view schematically illustrating light from the reflective polarizing sheet of the optical member shown in FIG. 3 .

Referring to FIG. 3 , the optical member 100 includes a diffusion sheet 110 , a deformation prevention layer 120 , a quantum dot sheet 130 , a prism sheet 140 , and a reflective polarizing sheet 150 . can do. The optical member 100 is integrally formed by laminating the diffusion sheet 110 , the deformation prevention layer 120 , the quantum dot sheet 130 , the prism sheet 140 , and the reflective polarizing sheet 150 . can do. As the optical member 100 is integrally formed, rigidity may be secured, quality may be improved, and productivity may be improved. The optical member 100 reduces the thickness by stacking the diffusion sheet 110 , the deformation prevention layer 120 , the quantum dot sheet 130 , the prism sheet 140 , and the reflective polarizing sheet 150 . can do it

3 and 4 , the diffusion sheet 110 may be disposed in front of the light source 81 . The diffusion sheet 110 may be disposed in front of the reflective sheet 90 . The diffusion sheet 110 may evenly diffuse the irregular light generated from the light sources 81 . The diffusion sheet 110 may evenly diffuse the light incident on the incident surface to be emitted to the emission surface. The diffusion sheet 110 may include a diffusion bead 111 , a first diffusion base layer 112 , a diffusion prism pattern 113 , and a second diffusion base layer 114 .

The diffusion bead 111 may primarily diffuse the light incident to the diffusion sheet 110 . The diffusion bead 111 may have an irregular shape to evenly mix light.

The first diffusion base layer 112 and the second diffusion base layer 114 may include a poly ethylene terephthalate (PET) or poly styrene (PS) material.

A diffusion prism pattern 113 may be positioned between the first diffusion base layer 112 and the second diffusion base layer 114 . The diffusion prism pattern 113 may secondarily diffuse light by changing the path of the light passing through the diffusion bead 111 .

The diffusion prism pattern 113 may be a pattern in which ridges and valleys are repeated. The diffusion prism pattern 113 may be formed by arranging a plurality of prisms having a substantially triangular cross-section to be adjacent to each other. The angle of the apex of the prism may be formed to be 90° or more. The angle of the apex of the prism may have an obtuse angle.

3 and 5 , the deformation prevention layer 120 may be disposed in front of the diffusion sheet 110 . The deformation prevention layer 120 may be laminated between the diffusion sheet 110 and the quantum dot sheet 130 to minimize deformation of the optical member 100 through an adhesive force.

The deformation prevention layer 120 may include a material having a thermal expansion coefficient smaller than that of the diffusion sheet 110 . The deformation prevention layer 120 may include a material having a smaller coefficient of thermal expansion than that of the second diffusion base layer 114 . The deformation prevention layer 120 may include a material having a thermal expansion coefficient smaller than that of the quantum dot sheet 130 . The deformation prevention layer 120 may include a material having a coefficient of thermal expansion smaller than that of the first barrier film 131 . The deformation prevention layer 120 may include a material having a relatively low expansion or contraction rate compared to the diffusion sheet 110 and/or the quantum dot sheet 130 . The deformation prevention layer 120 may include the deformation prevention layer 120 including glass.

Conventionally, in consideration of thermal deformation of the optical member 100 , the thickness of the bezel of the front chassis 20 supporting the edge of the optical member 100 has to be secured by a predetermined size or more. Since the deformation prevention layer 120 of the optical member 100 according to an embodiment of the present invention expands less by heat than the diffusion sheet 110 and/or the quantum dot sheet 130 , the display device 1 is It is possible to prevent excessive deformation of the diffusion sheet 110 and/or the quantum dot sheet 130 when the diffusion sheet 110 and/or the quantum dot sheet 130 is expanded by generating heat as it is driven. . As the display device 1 according to an embodiment of the present invention prevents the diffusion sheet 110 and/or the quantum dot sheet 130 from being excessively deformed by the deformation prevention layer 120 , the front chassis 20 . The width of the bezel can be further reduced.

The anti-deformation layer 120 may include a material having a relatively high light transmittance and a relatively low light absorptivity in order to minimize the change in light characteristics when the light passing through the diffusion sheet 110 passes. . The deformation prevention layer 120 may include a metal-based material.

3 and 6 , a quantum dot sheet 130 may be disposed in front of the deformation prevention layer 120 . The quantum dot sheet 130 may improve color reproducibility by changing the wavelength of light. Specifically, quantum dots, which are semiconductor crystals having a size of several nanometers that emit light, may be dispersedly disposed inside the quantum dot sheet 130 . A quantum dot can receive blue light and generate all colors of visible light according to its size. The smaller the quantum dot size, the shorter the wavelength light may be generated, and the larger the quantum dot size, the longer wavelength light may be generated.

The quantum dot sheet 130 may include a first barrier film 131 , a quantum dot layer 132 , a second barrier film 133 , and an air layer 134 .

The quantum dot layer 132 may be sealed by the first barrier film 131 and the second barrier film 133 to block oxygen.

The air layer 134 may be formed by stacking beads from the second barrier film 133 . Although not shown, the air layer 134 may be formed by a protrusion extending from the second barrier film 133 . The air layer 134 may be formed by a configuration that can secure a space between the quantum dot sheet 130 and the prism sheet 140 . The air layer 134 may be defined as a space formed between the quantum dot sheet 130 and the prism sheet 140 . The air layer 134 may be filled with air having a relatively low refractive index. The air layer 134 may increase the recycling efficiency of light passing through the second barrier film 133 . Accordingly, the display device 1 according to an embodiment of the present invention may implement a wide color.

3 and 7 , the prism sheet 140 may be disposed in front of the quantum dot sheet 130 . The prism sheet 140 refracts and condenses the light emitted from the quantum dot sheet 130 to improve the luminance of the display device 1 . Specifically, the light incident on the prism sheet 140 passes through the first prism pattern 142 and the second prism pattern 144, and may be mostly refracted and condensed, and the remaining part may be refracted and lost or reflected. have.

The prism sheet 140 includes a first prism base layer 141, a first prism pattern 142, a second prism base layer 143, a second prism pattern 144, and a third prism base layer ( 145) may be included.

The first prism pattern 142 may be positioned between the first prism base layer 141 and the second prism base layer 143 . The second prism pattern 144 may be positioned between the second prism base layer 143 and the third prism base layer 145 . The first prism pattern 142 and the second prism pattern 144 may have the same structure.

Alternatively, the first prism pattern 142 may be provided differently from the second prism pattern 144 . Specifically, the first prism pattern 142 may extend in an approximately Y direction, and the second prism pattern 144 may extend in an X direction approximately perpendicular to the Y direction.

3 and 8 , the reflective polarizing sheet 150 may be disposed in front of the prism sheet 140 . The reflective polarizing sheet 150 may include a reflective polarizing film 151 and a condensing prism pattern 152 .

A reflective polarizing film (DBEF, Dual Brightness Enhancement Film, 151) may transmit one polarized light and reflect another polarized light to improve luminance. That is, the light reflected from the reflective polarizing film 151 may be recycled inside the display device 1 to improve the luminance of the display device 1 . Specifically, some of the light reflected from the reflective polarizing film 151 may be reflected back to the reflective polarizing film 151 by the reflective sheet 90 . As this process is repeated, the polarization direction of the light may be changed, and if the polarization direction of the light becomes parallel to the polarization direction of the reflective polarizing film 151 , the light may pass through the reflective polarizing film 151 .

The light collecting prism pattern 152 may concentrate light to improve luminance. The light collecting prism pattern 152 may be a pattern in which ridges and valleys are repeated. The light collecting prism pattern 152 may be formed by arranging a plurality of prisms having a substantially triangular cross-section to be adjacent to each other. The angle of the apex of the prism may be formed to be 90° or more. The angle of the apex of the prism may have an obtuse angle. Accordingly, the light collecting efficiency of the light collecting prism pattern 152 may increase. As the change in luminance of the display device 1 is reduced by the condensing prism pattern 152 , the contrast ratio may be improved.

9 is a view schematically showing a cross-section of an optical member according to another embodiment of the present invention.

Referring to FIG. 9 , the optical member 200 according to another embodiment of the present invention will be described. The same reference numerals are assigned to the same components as those of the embodiment shown in FIG. 3 , and detailed descriptions thereof may be omitted.

Referring to FIG. 9 , the diffusion sheet 210 of the optical member 200 according to another embodiment of the present invention may include a diffusion pattern 213 .

The diffusion pattern 213 may be formed by stacking beads from the first diffusion base layer 112 . Although not shown, the diffusion pattern 213 may be formed by a protrusion extending from the first diffusion base layer 112 . The diffusion pattern 213 may be formed by a configuration capable of securing a space between the first diffusion base layer 112 and the second diffusion base layer 114 . The diffusion pattern 213 may be defined as a space formed between the first diffusion base layer 112 and the second diffusion base layer 114 .

The diffusion pattern 213 according to this configuration may shield and/or diffuse the light by changing the path of the light passing through the diffusion bead 111 . According to this configuration, the diffusion pattern 213 according to another embodiment of the present invention may have improved shielding and diffusion performance compared to the diffusion prism pattern 113 illustrated in FIG. 3 .

The reflective polarizing sheet 250 of the optical member 200 according to another embodiment of the present invention may include a protective bead 252 .

The protective bead 252 may diffuse the light passing through the reflective polarizing film 151 . The protective bead 252 may have an irregular shape to evenly mix the light. The protective bead 252 may protect the optical member 200 as it is positioned at the forefront of the optical member 200 .

As the protective bead 252 is provided on the reflective polarizing sheet 250 , the first prism pattern 242 of the optical member 200 according to another embodiment of the present invention is different from the second prism pattern 244 . can be provided. Specifically, unlike the embodiment shown in FIG. 3 , the first prism pattern 242 may extend in approximately the X direction, and the second prism pattern 244 may extend in the Y direction approximately perpendicular to the X direction. have. According to this configuration, the optical member 200 according to another embodiment of the present invention can maintain a light collecting performance similar to that of the optical member 100 shown in FIG. .

That is, in the optical member 200 according to another embodiment of the present invention, as the first prism pattern 242 and the second prism pattern 244 of the prism sheet 240 extend in approximately vertical directions, respectively, light collecting performance Although this is improved and the protective bead 252 is provided, it is possible to secure the necessary light collecting performance.

In the above, specific embodiments have been shown and described. However, it is not limited only to the above-described embodiments, and those of ordinary skill in the art to which the invention pertains can make various changes without departing from the spirit of the invention described in the claims below. .

One; display device
100, 200; optical member
110, 210; diffusion sheet
111; diffusion bead
113; diffuse prism pattern
120; strain relief layer
130; Quantum dot sheet
134; air layer
140, 240; Prism sheet
150, 250; Reflective Polarizing Sheet
151; Reflective Polarizing Film
152; Condensing Prism Pattern
213; diffusion pattern
252; protection bead

Claims (20)

liquid crystal panel;
a light source provided to provide light to the liquid crystal panel; and
and an optical member disposed between the liquid crystal panel and the light source;
The optical member,
a diffusion sheet provided to diffuse the light incident from the light source; and
A display device comprising a; a deformation prevention layer comprising a material having a smaller expansion rate or contraction rate than the diffusion sheet. According to claim 1,
The optical member may include a quantum dot sheet disposed on the other side opposite to one side on which the diffusion sheet of the deformation prevention layer is disposed. 3. The method of claim 2,
The optical member includes a prism sheet disposed on the other side opposite to one side on which the deformation prevention layer of the quantum dot sheet is disposed,
The quantum dot sheet display device including an air layer formed on one side facing the prism sheet. 3. The method of claim 2,
The anti-deformation layer is configured to include a material having a coefficient of thermal expansion smaller than that of the diffusion sheet and the quantum dot sheet. 3. The method of claim 2,
The deformation prevention layer is laminated in front of the diffusion sheet,
The quantum dot sheet is stacked in front of the anti-deformation layer. According to claim 1,
The optical member,
a reflective polarizing film provided to transmit a portion of the passing light and reflect the other portion; and
and a condensing prism pattern formed on one side of the reflective polarizing film facing the liquid crystal panel. 7. The method of claim 6,
A cross section of the light collecting prism pattern has an obtuse angle of an apex angle. According to claim 1,
The optical member is integrally formed with a display device. According to claim 1,
The anti-deformation layer is a display device comprising glass. According to claim 1,
The diffusion sheet,
a diffusion bead formed to diffuse incident light; and
and a diffusion prism pattern formed to change a path of light passing through the diffusion bead. According to claim 1,
The anti-deformation layer is configured to include a material having a higher light transmittance than the diffusion sheet. According to claim 1,
The anti-deformation layer is configured to include a material having a lower light absorption than the diffusion sheet. According to claim 1,
The diffusion sheet,
a diffusion bead formed to diffuse incident light; and
and a diffusion pattern formed to shield or diffuse the light passing through the diffusion bead. 3. The method of claim 2,
The optical member,
a reflective polarizing film provided to transmit a portion of the passing light and reflect the other portion; and
and a protective bead formed on one side of the reflective polarizing film facing the liquid crystal panel. 15. The method of claim 14,
and a prism sheet disposed between the quantum dot sheet and the reflective polarizing film,
The prism sheet,
a first prism pattern extending in a first direction; and
and a second prism pattern extending in a second direction perpendicular to the first direction. liquid crystal panel;
a light source provided to provide light to the liquid crystal panel; and
and an optical member disposed between the liquid crystal panel and the light source;
The optical member,
a diffusion sheet provided to diffuse the light incident from the light source;
a quantum dot sheet provided to convert the light passing through the diffusion sheet;
a deformation prevention layer disposed between the diffusion sheet and the quantum dot sheet and comprising a material having a thermal expansion coefficient smaller than that of the diffusion sheet or the quantum dot sheet;
a reflective polarizing film disposed in front of the anti-deformation layer and provided to transmit a portion of the passing light and reflect the other portion; and
and a condensing prism pattern formed on one side of the reflective polarizing film facing the liquid crystal panel. 17. The method of claim 16,
The optical member further includes a prism sheet disposed between the quantum dot sheet and the reflective polarizing film,
An air layer is formed between the quantum dot sheet and the prism sheet. 17. The method of claim 16,
The anti-deformation layer is configured to include a material having a higher light transmittance and a lower light absorptivity than the diffusion sheet and the quantum dot sheet. 17. The method of claim 16,
The diffusion sheet,
a diffusion bead formed to diffuse incident light; and
and a diffusion prism pattern formed to change a path of light passing through the diffusion bead. 17. The method of claim 16,
The optical member is integrally formed with a display device.

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