KR20090054325A - Optical sheet, back light unit and liquid crystal display device comprising the same - Google Patents

Optical sheet, back light unit and liquid crystal display device comprising the same Download PDF

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Publication number
KR20090054325A
KR20090054325A KR1020070121125A KR20070121125A KR20090054325A KR 20090054325 A KR20090054325 A KR 20090054325A KR 1020070121125 A KR1020070121125 A KR 1020070121125A KR 20070121125 A KR20070121125 A KR 20070121125A KR 20090054325 A KR20090054325 A KR 20090054325A
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KR
South Korea
Prior art keywords
protrusion
optical sheet
protrusions
substrate
height
Prior art date
Application number
KR1020070121125A
Other languages
Korean (ko)
Inventor
김진우
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020070121125A priority Critical patent/KR20090054325A/en
Publication of KR20090054325A publication Critical patent/KR20090054325A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction

Abstract

The present invention includes a substrate and a diffusion located on the substrate, the diffusion including a plurality of projections, the diffusion including a first projection and a second projection, the height and width of the first projection being the second projection. Is different from the height and the width of the plurality of protrusions to provide an optical sheet having a polygonal cross-section of the square or more.

Optical sheet

Description

Optical Sheet, Back Light Unit And Liquid Crystal Display Device Comprising The Same}

The present invention relates to an optical sheet, a backlight unit including the same, and a liquid crystal display device.

Recently, the display field for visually expressing various electrical signal information is rapidly developing, and in response to this, various flat panel displays (FPDs) with excellent characteristics such as thinness, light weight, and low power consumption are being developed. It is introduced and rapidly replaced the existing CRT (Cathode Ray Tube).

Examples of such flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), field emission displays (FEDs), and electroluminescence displays (ELDs). The liquid crystal display has a large contrast ratio and is excellent in moving image display, and is currently used most widely in the field of display screens, monitors, and TVs for notebook computers.

In general, the liquid crystal display may include a backlight unit disposed below the liquid crystal panel to provide light to the liquid crystal panel, in addition to the liquid crystal panel displaying an image with the light receiving display device.

The backlight unit may include a light source, an optical sheet, and the like to provide light to the liquid crystal panel. Here, the optical sheet may include a diffusion sheet, a protective sheet, a prism sheet, and the like.

However, although the light emitted from the conventional light source is diffused in the direction of the liquid crystal panel from the diffusion sheet, the light is focused on the prism sheet, which causes a problem that the viewing angle of the liquid crystal display device is lowered.

Accordingly, the present invention can provide an optical sheet having an excellent viewing angle, a backlight unit including the same, and a liquid crystal display device.

In order to achieve the above object, the optical sheet according to an embodiment of the present invention is located on the substrate and the substrate, and includes a diffusion comprising a plurality of protrusions, the diffusion portion is the first protrusion and the second protrusion The height and width of the first protrusion may be different from the height and width of the second protrusion, and the plurality of protrusions may be polygonal polygons having a cross section or more.

In addition, the backlight unit according to an embodiment of the present invention includes a light source and an optical sheet positioned on the light source, wherein the optical sheet is positioned on the substrate and the substrate, and includes a diffusion part including a plurality of protrusions. The diffusion may include a first protrusion and a second protrusion, and a height and a width of the first protrusion may be different from a height and a width of the second protrusion, and the plurality of protrusions may have a polygonal cross section or more.

In addition, the liquid crystal display according to the exemplary embodiment of the present invention includes a light source, an optical sheet positioned on the light source, and a liquid crystal panel positioned on the optical sheet, wherein the optical sheet is positioned on the substrate and the substrate. And a diffusion including a plurality of protrusions, wherein the diffusion includes a first protrusion and a second protrusion, and the height and width of the first protrusion are different from the height and width of the second protrusion. The protrusion of may have a polygonal cross section or more.

Therefore, the optical sheet, the backlight unit and the liquid crystal display device including the same, have an advantage of providing the optical sheet having the excellent viewing angle, the backlight unit and the liquid crystal display device including the same.

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

1A and 1C are views of an optical sheet according to an embodiment of the present invention.

1A and 1C, an optical sheet 100 according to an embodiment of the present invention includes a substrate 110 and a diffuser 120 disposed on the substrate 110 and including a plurality of protrusions. The diffusion part 120 includes a first protrusion 130 and a second protrusion 140, and the height h1 and the width w1 of the first protrusion 130 are defined by the second protrusion ( It is different from the height (h2) and width (w2) of the 140, the plurality of protrusions may be a polygon of a cross-section or more squares.

The substrate 110 serves to transmit the light incident from the light source. To this end, since the substrate 110 must be able to transmit light incident from the light source, any one selected from the group consisting of a light transmissive material, for example, polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene and polyepoxy It may be made of one, but not limited to.

The diffusion unit 120 may serve to diffuse light incident from the light source.

The diffusion part 120 includes a plurality of protrusions 130, and the diffusion part 120 includes a first protrusion 131 and a second protrusion 132, and the height of the first protrusion 131 ( The height h1 and the width w1 are different from the height h2 and the width w2 of the second protrusion 132, and the plurality of protrusions 130 may be polygonal polygons having a cross section or more.

In addition, the plurality of protrusions 130 may be linearly formed along the length direction of the protrusion, but is not limited thereto.

Looking at the cross-sections of the plurality of protrusions 130, the protrusions 130 may be formed in a different cross-sectional shape, it may be made of a polygon or more, for example, a rhombus or trapezoidal shape. However, the present invention is not limited thereto and may have the same cross-sectional shape.

The cross section of the first protrusion 131 and the cross section of the second protrusion 132 may have different shapes, but are not limited thereto and may have the same shape.

The height h1 and the width w1 of the first protrusion 131 of the plurality of protrusions 130 may be different from the height h2 and the width w2 of the second protrusion 132, but are not limited thereto. It may be the same as each other.

Here, the plurality of protrusions 130 may be made of a height of 20 to 500㎛. In addition, each of the plurality of protrusions 130 may have a different width, and preferably, a width of 1 to 100 μm.

Accordingly, the plurality of protrusions 130 may have a height of 20 to 500 μm and a width of 1 to 100 μm, thereby improving characteristics of diffusing light incident from a light source below.

In addition, the protrusions 130 may be spaced apart at different intervals, and may preferably be formed at an interval p of 1 to 10 μm. Here, when the spacing between the protrusions 130 is 1 μm or more, the transmittance of light incident from the light source may be improved. When the spacing between the protrusions 130 is 10 μm or less, the haze may be appropriately adjusted. There is an advantage to this.

As described above, the plurality of protrusions 130 may have different heights, widths, and intervals, but the present invention is not limited thereto, and may be regularly and may be the same.

As described above, the optical sheet according to an embodiment of the present invention includes a plurality of protrusions having a polygonal cross section or more, so that light incident from a light source may be irregularly refracted at the protrusions, thereby improving diffusion characteristics of the optical sheet. There is an advantage to that.

Hereinafter, the manufacturing method of the optical sheet according to the embodiment of the present invention described above is as follows.

2 is a flowchart illustrating a method of manufacturing an optical sheet according to an embodiment of the present invention.

2, in order to manufacture the optical sheet 100 according to an embodiment of the present invention, first, the substrate 110 is prepared (S200).

Next, a polymer resin solution is coated on the substrate 110 (S210). Here, any one method of knife coating, roll coating, and gravure coating may be used for the application of the polymer resin solution, but is not limited thereto.

Next, the polymer resin solution is cured (S220). At this time, for curing the polymer resin solution, for example, ultraviolet rays may be used.

Next, it is pressed into a mold having a reverse phase of the protrusion to form the cured resin solution (S230). As a result, an optical sheet according to an exemplary embodiment may be manufactured.

Here, various methods may be used to form the protrusions. For example, the protrusion may be formed by using a mold having a reverse phase of the protrusion or using a sheet having a reverse phase of the protrusion.

On the other hand, unlike the above-mentioned, the protrusion may be formed by scraping off with a knife.

Hereinafter, various structures of the optical sheet according to the embodiment of the present invention described above will be described in detail. The optical sheet to be described later may naturally be applied to all the embodiments disclosed below without the description of the protrusions.

3A to 3C illustrate an optical sheet according to other embodiments of the present invention.

3A to 3C, the optical sheet 300 according to another embodiment of the present invention is positioned on the substrate 310 and the substrate 310 as described above, and the plurality of protrusions 330 are disposed. It includes a diffusion portion 320, the diffusion portion 320 includes a first protrusion 331 and a second protrusion 332, the height and width of the first protrusion 331 is the second It is different from the height and width of the protrusion 332, the plurality of protrusions 330 may have a polygonal cross section or more.

At this time, the protrusion 330 may form a straight line or continuous bending.

The protrusion 330 may have a zigzag shape in which left and right are random, and an average horizontal amplitude of the protrusion 330 may be 1 to 20 μm.

In addition, the valleys 335 of the protrusion 330 may also have a random zigzag shape, and the average horizontal amplitude of the valleys 335 may be 1 to 20 μm.

In addition, the height from each bottom surface of the protrusion 330 may change periodically. For example, the average height difference of the protrusions 330 may be 1 to 20 μm.

As described above, the horizontal amplitude of the protrusion 330 or the valley 335 of the optical sheet 300 according to another embodiment of the present invention may be changed randomly, the height of the protrusion 330 may be changed periodically.

Therefore, defects such as a result of crushing of the protrusion 330 due to physical contact with other sheets in contact with the upper sheet of the optical sheet 300 are difficult to be visually easily detected, and also the image quality of the liquid crystal display device. May not affect.

4A and 4B are views illustrating an optical sheet according to another embodiment of the present invention.

4A and 4B, the optical sheet 400 according to the above-described embodiments of the present invention is positioned on the substrate 410 and the substrate 410, and includes a plurality of protrusions 430. And a diffusion portion 420, wherein the diffusion portion 420 includes a first protrusion 431 and a second protrusion 432, and the height and width of the first protrusion 431 are the second protrusion 432. Different from the height and width of the), the plurality of protrusions 430 may have a polygonal cross section or more.

The protrusion 430 may further include a plurality of first beads 440.

Here, the first bead 440 with respect to the protrusion 420 may be included in 2 to 10 parts by weight. Therefore, it is possible to prevent a problem that the light incident from the light source is difficult to diffuse by the first bead 440, and to prevent the transmittance of the light incident from the light source from decreasing.

At this time, the particle diameter of the first bead 440 is not uniform and may have an irregular distribution. In addition, the first bead 440 may have an irregular distribution without having a regular distribution in the protrusion 430.

In this case, the first bead 440 may be completely included in the protrusion 430 so as not to be exposed on the surface of the protrusion 430.

As described above, the optical sheet according to an embodiment of the present invention includes the plurality of beads in the protrusion, thereby improving the diffusion characteristic of the optical sheet, thereby improving the viewing angle.

5A and 5B are views illustrating an optical sheet according to still other embodiments of the present invention.

5A and 5B, an optical sheet 500 according to another embodiment of the present invention is positioned on a substrate 510 and the substrate 510 and includes a plurality of protrusions 530. And a diffusion portion 520, wherein the diffusion portion 520 includes a first protrusion 531 and a second protrusion 532, and the height and width of the first protrusion 531 are the second protrusion 532. Different from the height and width of the), the plurality of protrusions 530 may have a polygonal cross section or more.

The optical sheet 500 according to another embodiment of the present invention may further include a protective layer 550 including a plurality of second beads 552 under the substrate 510.

The protective layer 550 may serve to improve heat resistance of the optical sheet 500. In more detail, the protective layer 550 may include a resin-based base material 551 and a plurality of second beads 552 dispersed in the base material 551.

The base material 551 is transparent and may use an acrylic resin having excellent heat resistance and mechanical properties. The acrylic resin may be, for example, polyacrylate or polymethyl methacrylate.

The second bead 552 may be manufactured using the same type or different types of resin as the base material 551, and may be included in an amount of 25 to 35 parts by weight based on the base material 551.

The size of the second bead 552 may be appropriately selected according to the thickness of the substrate 510, and may be 2 to 10 μm.

In an embodiment of the present invention, the size of the second bead 552 may be substantially the same, and the distribution in the base material 551 may be regular. In contrast, the sizes of the second beads 552 are different from each other, and the distribution in the base material 551 may be irregular.

In addition, the second bead 552 mentioned in the embodiment of the present invention may be the same as the aforementioned first bead, but is not limited thereto and may be different from each other.

The protective layer 550 may prevent the optical sheet from being deformed by heat generated from the light source. That is, wrinkles do not occur in the optical sheet by the base material 551 having high heat resistance, and even when the optical sheet is deformed at a high temperature, the restoring force of returning to the original optical sheet shape again at room temperature is excellent.

In addition, the protective layer 550 may also serve to prevent scratches on the optical sheet due to external impact or other physical force.

6A to 6C are views showing another optical sheet of the present invention.

Referring to FIG. 6A, an optical sheet 600 according to another embodiment of the present invention may include an optical layer 610 and a diffuser 650 positioned on the optical layer 610.

The optical layer 610 may serve to transmit or reflect light incident from the light source. The optical layer 610 may have a structure in which isotropically oriented layers and anisotropically oriented layers are alternately stacked, and their refractive indices may be different from each other.

Here, the isotropic oriented layer can be polymethylmethacrylate (PMMA) and the anisotropic oriented layer can be made of polyester.

In addition, the optical layer 610 preferably has a thickness of 120 to 450㎛.

Accordingly, some of the light incident from the light source is transmitted through the optical layer 610 and some is reflected from the optical layer 610 toward the lower light source. At this time, the light reflected toward the light source is reflected again to be incident to the optical layer 610, a part of the light incident on the optical layer 610 is transmitted through the optical layer 610, a part of the lower portion in the optical layer 610 Is reflected again in the direction of the light source.

That is, the optical layer 610 alternately stacks polymer layers having different refractive indices, orients molecular orientations of the polymer in one direction to transmit only polarizations in the other direction, and reflects polarizations in the same direction. The efficiency of light incident from the light source can be improved.

The diffusion part 650 is positioned on the optical layer 610. The diffuser 650 may serve to diffuse light.

The diffusion part 650 may be made of a transparent polymer resin to transmit light incident from the outside. Here, the polymer resin may be any one selected from the group consisting of acrylic, polycarbonate, polypropylene, polyethylene, and polyethylene terephthalate.

As described above, the diffusion portion 650 includes a plurality of protrusions 670, and the diffusion portion 650 includes a first protrusion 651 and a second protrusion 652, and the first protrusion ( The height and width of 651 are different from the height and width of the second protrusion 652, and the plurality of protrusions 650 may be polygonal polygons having a cross section or more. Hereinafter, since the detailed description of the diffusion unit 650 has been described above, it will be omitted.

In addition, referring to FIG. 6B, the optical sheet 600 according to another embodiment of the present invention described above may include an adhesive layer 620 positioned on the optical layer 610, and a substrate positioned on the adhesive layer 620. 630 and the diffusion part 650 positioned on the substrate 630 may be further included.

The adhesive layer 620 may serve to bond the substrate 630 attached later on the optical layer 610. The adhesive layer 620 may use an acrylic resin.

Since the substrate 630 should be able to transmit light, it may be made of any one selected from the group consisting of a light transmissive material, for example, polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene, and polyepoxy. It is not limited.

In addition, referring to FIG. 6C, the optical sheet 600 according to the exemplary embodiment may further include the above-described protective layer 660. Since the description of the protective layer 660 has been described above, a description thereof will be omitted.

7A to 7B are exploded perspective views and cross-sectional views for describing a configuration of a backlight unit including an optical film according to embodiments of the present disclosure.

In FIG. 7A, the edge type backlight unit is illustrated as the backlight unit, and the overlapping description is omitted since the optical sheet of the present invention is the same as the above-described optical sheet.

7A and 7B, the backlight unit 700 according to an exemplary embodiment of the present invention may be provided in the liquid crystal display device and may provide light to the liquid crystal panel provided in the liquid crystal display device.

The backlight unit 700 may include a light source 720 and an optical sheet 730. In addition, the backlight unit 700 may further include a light guide plate 740, a reflective plate 750, a bottom cover 760, and a mold frame 770.

The light source 720 may generate light by using driving power applied from the outside, and may emit the generated light.

For example, at least one light source 720 may be formed on one side of the light guide plate 740 along the long axis direction of the light guide plate 740, or at least one light source may be formed on each side of the light guide plate 740. have. Here, the light emitted from the light source 720 is incident directly into the light guide plate 740, or the light source housing 722 formed to cover a portion of the light source 720, for example, about 3/4 of the outer peripheral surface of the light source 720 After reflection, the light guide plate 740 may be incident into the light guide plate 740.

The light source 720 may include, for example, a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an external electrode fluorescent lamp (EEFL), and a light emitting diode. It may be one of (Light Emitting Diode: LED), but is not limited thereto.

The optical sheet 730 may be disposed on the light guide plate 740. The optical sheet 730 may diffuse light incident from the light source 720, and may include a substrate and a diffuser formed on the substrate.

When light is incident from the lower part of the diffusion part, light may be diffused by the protrusion part.

As a result, display quality of the backlight unit 700 according to the exemplary embodiment of the present invention may be improved.

The light guide plate 740 may be disposed to face the light source 720, and may guide the light so that light incident from the light source 720 is emitted upward.

The reflective plate 750 may be disposed under the light guide plate 740, and may reflect light emitted downward from the light source 720 through the light guide plate 740 upward.

The bottom cover 760 may include a bottom part 762 and a side part 764 formed to extend from the bottom part 762 to form an accommodation space, and the light source 720 and the optical sheet 730 may be formed in the accommodation space. The light guide plate 740 and the reflective plate 750 may be accommodated.

The mold frame 770 may be formed in a substantially rectangular frame shape and may be fastened to the bottom cover 760 from the top of the bottom cover 760 in a top down manner.

8A and 8B are exploded perspective views and cross-sectional views illustrating a configuration of a backlight unit according to an embodiment of the present invention.

All. 8A and 8B illustrate a direct backlight unit as the backlight unit, but the present invention is not limited thereto. Meanwhile, the backlight unit illustrated in FIGS. 8A and 8B is substantially the same as the backlight unit illustrated in FIG. 7A except for arrangement of a light source and a change in components thereof, and thus, redundant descriptions thereof will be omitted. Explain only about.

8A and 8B, the backlight unit 800 according to an embodiment of the present invention may be provided in the liquid crystal display and may provide light to the liquid crystal panel provided in the liquid crystal display.

The backlight unit 800 may include a light source 820 and an optical sheet 830. In addition, the backlight unit 800 may further include a reflector 850, a bottom cover 860, a mold frame 870, and a diffuser plate 880.

At least one light source 820 may be disposed under the diffuser plate 880. For this reason, the light emitted from the light source 820 may be incident directly to the diffusion plate 880.

The optical sheet 830 may be disposed on the diffuser plate 880. The optical sheet 830 may diffuse light incident from the light source 820, and may include a substrate and a diffuser formed on the substrate.

When light is incident from the lower part of the diffusion part, light may be diffused by the diffusion part.

As a result, display quality of the backlight unit 800 according to an exemplary embodiment may be improved.

The diffusion plate 880 may be disposed between the light source 820 and the optical sheet 830, and may diffuse light incident from the light source 820 upward. This is to prevent the shape of the light source 820 from being visible through the backlight unit 800 and to further diffuse the light.

9A and 9B are exploded perspective views and cross-sectional views for describing a configuration of a liquid crystal display according to an exemplary embodiment of the present invention. 9A and 9B illustrate the backlight unit illustrated in FIGS. 7A and 7B as the backlight unit, but the present invention is not limited thereto. The backlight unit illustrated in FIGS. 8A and 8B may be employed as the backlight unit. Meanwhile, since the backlight units shown in FIGS. 9A and 9B are the same as described above, overlapping descriptions are omitted and only the features thereof will be described.

9A and 9B, the liquid crystal display 900 according to an exemplary embodiment may display an image by using electro-optical characteristics of the liquid crystal.

The liquid crystal display device 900 may include a backlight unit 910 and a liquid crystal panel 1010.

The backlight unit 910 may be mounted under the liquid crystal panel 1010 and may provide light to the liquid crystal panel 1010.

The backlight unit 910 may include a light source 920 and an optical sheet 930. In addition, the backlight unit 910 may further include a light guide plate 940, a reflector 950, a bottom cover 960, and a mold frame 970.

The liquid crystal panel 1010 may be seated on the mold frame 970 and may be fixed by the top cover 1020 fastened to the bottom cover 960 in a top-down manner.

The liquid crystal panel 1010 may display an image using light provided from the backlight unit 910, specifically, light emitted from the light source 920.

The liquid crystal panel 1010 may include a color filter substrate 1012 and a thin film transistor substrate 1014 that face each other with the liquid crystal interposed therebetween.

The color filter substrate 912 may implement colors of the image displayed through the liquid crystal panel 1010.

The color filter substrate 1012 may include a color filter array formed of a thin film on a transparent substrate such as glass or plastic, for example, a red / green / blue color filter. Here, the upper polarizer may be disposed on the color filter substrate 1012.

The thin film transistor substrate 1014 is electrically connected to a printed circuit board 918 on which a plurality of circuit components are mounted through the driving film 916. The thin film transistor substrate 1014 may apply a driving voltage provided from the printed circuit board 918 to the liquid crystal in response to a driving signal provided from the printed circuit board 918.

The thin film transistor substrate 1014 may include a thin film transistor and a pixel electrode formed of a thin film on another substrate of a transparent material such as glass or plastic.

Here, a lower polarizer may be attached to the lower portion of the thin film transistor substrate 1014.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1A to 1C illustrate an optical sheet according to an embodiment of the present invention.

2 is a flowchart illustrating a method of manufacturing an optical sheet according to an embodiment of the present invention.

3A to 3C illustrate an optical sheet according to another embodiment of the present invention.

4A and 4B illustrate an optical sheet according to another embodiment of the present invention.

5A and 5B illustrate an optical sheet according to another embodiment of the present invention.

6A-6C illustrate an optical sheet according to another embodiment of the present invention.

7A and 7B illustrate a backlight unit according to an embodiment of the present invention.

8A and 8B illustrate a backlight unit according to another embodiment of the present invention.

9A and 9B illustrate a liquid crystal display according to an exemplary embodiment of the present invention.

Claims (14)

materials; And Located on the substrate, including a diffusion comprising a plurality of protrusions, The diffusion part includes a first protrusion and a second protrusion, and the height and width of the first protrusion are different from the height and width of the second protrusion, The plurality of protrusions is an optical sheet having a polygonal cross section or more squares. The method of claim 1, The plurality of protrusions are each an optical sheet made of a different height. The method of claim 1, And a plurality of protrusions each having a different width. The method of claim 1, The cross section of the first protrusion and the cross section of the second protrusion have different shapes. The method of claim 1, The cross section of the first protrusion and the cross section of the second protrusion have the same shape. The method of claim 1, The interval between the protrusions is 1 to 10㎛ optical sheet. The method of claim 1, The protrusion is a continuous sheet of different heights, and the left and right amplitude of the optical sheet is changed randomly. The method of claim 1, The diffusion part further comprises a plurality of first beads. The method of claim 1, An optical sheet further comprising a protective layer under the substrate. The method of claim 9, The protective layer comprises a base material and a plurality of second beads. The method of claim 1, An optical sheet further comprising an optical layer under the substrate. The method of claim 11, The optical layer is an optical sheet made of a polymer material having different refractive indices. Light source; And An optical sheet positioned on the light source, The optical sheet includes a substrate and a diffusion part located on the substrate, the diffusion part including a plurality of protrusions, The diffusion part includes a first protrusion and a second protrusion, and the height and width of the first protrusion are different from the height and width of the second protrusion, And a plurality of protrusions having a polygonal cross section or more in cross section. Light source; An optical sheet positioned on the light source; And A liquid crystal panel positioned on the optical sheet; The optical sheet includes a substrate and a diffusion part located on the substrate, the diffusion part including a plurality of protrusions, The diffusion part includes a first protrusion and a second protrusion, and the height and width of the first protrusion are different from the height and width of the second protrusion, And a plurality of protrusions having a polygonal cross section of a square.
KR1020070121125A 2007-11-26 2007-11-26 Optical sheet, back light unit and liquid crystal display device comprising the same KR20090054325A (en)

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KR1020070121125A KR20090054325A (en) 2007-11-26 2007-11-26 Optical sheet, back light unit and liquid crystal display device comprising the same

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101219591B1 (en) * 2010-10-07 2013-01-09 국민대학교산학협력단 Back light guide plate and manufacturing method for the same
CN106547047A (en) * 2017-01-24 2017-03-29 合肥京东方光电科技有限公司 A kind of light guide plate, backlight module and display device
TWI719878B (en) * 2019-04-08 2021-02-21 南韓商三星Ｓｄｉ股份有限公司 Polarizing plate and optical display apparatus comprising the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101219591B1 (en) * 2010-10-07 2013-01-09 국민대학교산학협력단 Back light guide plate and manufacturing method for the same
CN106547047A (en) * 2017-01-24 2017-03-29 合肥京东方光电科技有限公司 A kind of light guide plate, backlight module and display device
US10551545B2 (en) 2017-01-24 2020-02-04 Boe Technology Group Co., Ltd. Light guide plate, backlight module and display apparatus
TWI719878B (en) * 2019-04-08 2021-02-21 南韓商三星Ｓｄｉ股份有限公司 Polarizing plate and optical display apparatus comprising the same

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